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magazine 

for  radio  amateurs 


$1.00 

December  1973 

48768 


K 


*F 


<<, 


K> 


>. 


antennas  for 


A  product  in  the  amateur  market  gets  a  reputation  very  quickly.  It 
measures  up  to  what  you  expect  in  engineering,  performance  and  quality 
—  or  else.  That's  why  A/S  amateur  antennas  are  built  to  the  identical 
design  and  construction  standards  as  their  commercial  counterparts. 
Standards  that  have  made  them  specified  for  more  police  and  public 
safety  vehicle  installations  than  all  other  brands  combined. 


-177 

2  Meters 

Features  new  high 
conductivity  copper 
and  nickel  coated 
17-7  PH  stainless 
steel  whip.  Shunt 
fed  coil  encased  in 
waterproof  PVC 
jacket.  All  fittings 
chrome  plated  brass. 
Easy  snap-in 
mounting.  3  dB  gain  * 


NEW!  HM- 

1  Va  Meters 

(220  MHz) 

High  performance 

%  wavelength  design 
for  the  new  220  MHz 
activity!  Directly  fed 
with  low  loss  coil  in 
new  low-profile 
design.  Spring  and 
whip  easily 
removable  leaving 
only  1^i6"  high  base 
for  car  wash 
clearance.  3  dB  gain.* 


•175 
%  Meters 

Collinear  design 
with  truly  hot 
performance!  Base 
fittings  have  silver 
plated  contacts.  Can 
handle  100  watts. 
Whip  and  phasing 
coil  assembly  is  a  one 
piece  molded  design 
to  resist  vibration  and 
moisture.  5  dB  gain  * 


■4 

2  Meters 

Tough,  virtually 
indestructible 
antenna  for  hand- 

helds.  Completely 
insulated.  Base  fitting 
matches  Motorola 
HT,  E.  F.Johnson, 

and  Standard 
portables. 


I-5 

Same  as  above  but 

for  Drake  and  other 
packset  portables 
with  SO-239  fittings 


NEW  ASCOM    TOWERS 

High  strength,  low  maintenance 

aluminum  towers  for  HF  and  VHF 
antenna  installations.  There  is  a 
complete  line  of  ASCOM  self- 
supporting  towers-  in  heights  from 
30  to  90  feet  — at  attractive  prices! 


*Measured  over  a  %  wavelength  whip 

WRITE  FOR  FREE  AMATEUR  ANTENNA 
and/or  TOWER  CATALOGS 


the  antenna 


4$  "Stripes  of  Quality" 

Division  of  ORION  INDUSTRIES,  INC.,  1 243S  Euclid  Ave.  Cleveland,  Ohio  4410$ 

Export:  2200  Shames  Dr..  Westbury,  L.I..  New  York  11590     Canada:  A.  C.  Simmonds  &  Sons 


magazine 

for  radio  amateurs 


#159  DECEMBER  1973 


FEATURES 


EDITORIAL  STAFF 

Wayne  Green   W2NSD/1 
Keith  Lamonica   W7DXX/1 
Ron  Subka  WA9FPP/1 
Yvette  Grimes  WA8ULU/1 

ASSOCIATES 

Gus  Browning   W4BPD 
Tom  DiBiase  WB8KZD 
Bill  Hoisington   K1CLL 
Dave  Ingram    K4TWJ 
Joe  Kasser   G32CZ/W3 
Jon  Tara  WB8DBN 
Bill  Turner  WA0ABI 

PRODUCTION 

Ruthmary  Davis 
Karen  Hebert 
Biff  Mahoney 
Peri  Mahoney 
Janet  Oxley 
Lynn  Panciera-Fraser 
Bill  Sundberg 

BUSINESS 

Knud  E.  M.  Keller   KV4GG/1 

CIRCULATION 

Barbara  Bfock 
Jackie  Garner 
Dorothy  Gibson 

TRANSPORTATION 

Walter  Pence 

DRAFTING 

T.  M.  Graham  W8FKW 

Bill  Morel lo 

Wayne  Peeler   K4MVW 


2 

Amateur  Radio  News 

n 

Am^iiii  Nrw-> 

4 

Never  Say  Die   W2NSD/1 

12 

Ham  HHp 

6 

SSTV  Scene 

13 

Traveling  Ham 

6 

50  MHz  Band 

13 

HamburiflHi 

7 

Contests 

14 

QSL  Contest 

7 

Looking  West 

14 

Nuw  Products 

8 

SSTV  Program  Contest 

15 

Letters 

8 

Social  Events 

2T 

Caveat  Emptoi 

9 

DX  Footnotes 

120 

Circuits  ■  Circuits 

TO 

Repeaier  Update 

205 

Yearly  Index 

TO 

Intruder  Chase 

207 

Propagation 

11 

FCC  Monitoring  Stations 

203 

Ad  Index 

CONTENTS 

........ 


1     *     +     •* 


1      p      I      ■     * 


m        i       m        m       m 


i        .         ■        m 


25       IC  Code  Speed  Display < 

Check  the  FCC"$  code  machine  with  this  one. 

29        2  Meter  Linear  Amplifier 

In  case  you  want  to  try  Moonbounce. 

37       A  Simple  IC  Keyer , 

Nice  3  IC  Keyei 

41        Precision  Waveform  Generator .  .  .  . 

Sine,  vuu.it e  and  sawtooth  waves  trome  one  IC 
49       Helical  Resonators    ,-.....,  ^  ...,..*.  , 

Rise  fiorn  the  depths  of  ORM 
53       Sensitive  RF  Voltmeter  .  . 

Check  out  vout  rtg's  emononal  problems. 
63        The  Greenie    .,.-♦«.,. ♦ 

Tht*  first  halt  of  a  possible  Christmas  ariicle. 
67        Rapid  Receive*  Control  .  . 

Ustng  Touch  switches. 
71        increasing  SSB  Efficiency 

Wah  this  simple  mic  preamp. 
73       Identifying  Unmarked  ICs 

Cash  m  on  so  f  plus  bat  gains 
79        The  QSL  From  BY  Land . 

QSL  QRT 
81        Sequential  2  Tone  Decoder *,. ,  , 

Fot  ihi*  busy  repeaiei  thai  needs  more  than 

87        A  Satisfying  Minimum  Regulator 

A  throw  together  regulator  foi  quick  projects. 
89        Take-Apart  2  Meter  Beam 

FoJds  down  like  a\^  aluminum  Christmas  tree, 
91        Making  the  Most  of  Auto-ID  ,-..,-• ,.....,. 

Autocall  anyone7 
97       Choosing  and  Using  an  Electronic  Calculator 

Some  outlets  carry  10  15  models1 
107        Optimum  Design  of  CW  Filters   ..,♦...♦. 

Electronic  and  physiological  factors. 
117       Amateur  Rules  and  Regulations,  VI I 

This  month  a  crowd  gathers  to  witness  the  saving 

of  the  Spanish  Armada. 

Cover  girl  Linda  is  22t  single,  native  F  tori  diet  nt  college  grad,  loves  hoi^seback  riding  and 
works  as  a  school  teacher,  legislative  assistant  and  models  for  W4PPC,  who  took  the  cover 
picture.  George  is  president  of  George  Singer  Creative  Services  on  Key  Biscay ne.  Linda's 
measurements  are  89-58-91  (cm).  *  .kinda  makes  you  want  to  go  metric,  doesn't  it? 
Poster  available:  A  full  color  1  1x14  enlargement  of  this  lovely  cover  picture,  without  that 
obstructing  package,  is  available  from  73  Magazine,  Peterborough  NH  03458,  for  $3.  Now 
there's  a  way  to  dress  up  the  shack! 

73  Magazine  is  published  monthly  by  7J,  Inc.,  Peterborough,  New  Hampshire  03458. 
Subscription  rates  are  $6  for  one  year;  in  North  America  and  LAS.  Zip  Code  areas  overseas, 
$7  per  year  elsewhere.  Three  years,  $14,  and  $16  overseas,  Second  class  postage  paid  at 
Peterborough  NH  03458  and  at  additional  mailing  offices.  Printed  at  Menasha,  Wisconsin 
54942  U.S.A.  Entire  contents  copyright  1973  by  73  lnc*>  Peterborough  NH  0345  8.  Phone: 
603  924-3873.  Microfilm  edition  of  73  available  from  University  Microfilms,  Ann  Arbor,  MI 
48106,  Magnetic  tapes  available  from  Scienee  for  the  Blind,  332  Rock  Hill  Rd.,  Bala 
fynwyd  PA    1990  ' 


*      4      *        m 


.  .VE1BU 
.  W4KAE 
.  K2BLA 
.VE3GSP 
WflPSF/f 
.WA6IMIL 
.  .K1YSD 
.  W2EEY 
WAGQJU 
WA6IGU 
.,KA6IX 
.  .  W3JJU 

KL7EVO 
.  W1BHD 
K6HKB/1 
. K2QAW 
.  VU6AGX 
FCC 


DECEMBER  1973 


Amateur  Eabto 


DECEMBER    MCMLXXIII 


Monthly  Ham 


AMATEUR  AIDS 
RABIES  VICTIMS 

A  mother  and  daughter  were  saved 
from  the  dreaded  ravages  of  the  rabies 
disease  by  the  alert  action  of  Jim 
Brooks  KG4FU  of  the  U.S.  Naval  Base 
at  Guantanamo  Bay,  Cuba. 

The  story  began  during  the  morning 
hours  of  3  October  1973  when  Jim 
received  a  call  from  Cesar  HP4CK  of 
Changuinola,  Panama  to  help  in  relay- 
ing an  urgent  medical  message  into 
Ghana,  Africa. 

According  to  the  message  from 
Cesar,  the  wife  and  daughter  of  Mauro 
Chattaneo  from  Tema,  Ghana  had 
been  bitten  by  a  dog  while  visiting 
South  America.  Ten  days  later  the  dog 
was  found  to  be  rabid. 

Jim,  fearing  that  time  was  critical 
and  suspecting  that  propagation  into 
Africa  would  be  difficult,  drafted  a 
message  to  the  American  Embassy  in 
Ghana  and  sent  the  message  on  cir- 
cuits outside  of  the  amateur  bands 
informing  them  of  the  situation, 

A  message  was  later  received  from 
the  embassy  informing  Jim  that  the 
Cattaneo  family  had  begun  appro- 
priate medical  treatment. 


CLEGG  UPDATES   220 
REPEATER    LEASING 

PROGRAM 


In  its  continuing  efforts  to  bring 
220  MHz  activity  to  radio  amateurs 
from  coast  to  coast,  Clegg  is  now 
offering  two  lease  options  and  one 
option  to  purchase  its  Model  106 
self-contained,  220  MHz  repeater  with 

duplexes 

Clubs    may    lease    the    220    MHz 

repeater  at  a  monthly  rental  of  S25.00 
for  3  years  with  the  purchase  of  12 
FM  21  220  MHz  transceivers.  Clubs 
will  then  have  the  right  to  fully 
pruchase  the  repeater  at  S500  at  the 
end  of  the  first  year,  at  S300  after  the 
second  year,  and  at  Si 00  at  the  end  of 
the  third  year.  Or  secondly,  a  cfub 
may  lease  the  repeater  at  a  monthly 
rental  of  only  SIB  for  3  years  with  the 
purchase  of  35  FM -21  transceivers. 

Clubs  would  then  have  full 
purchase  rights  at  S500  at  the 
conclusion  of  the  first  year,  at  S300 
after  the  second  year,  and  at  S100  at 
the  end  of  3  years. 


Here  is  a  photograph  of  the  3crn  mobile  amateur  ng  presently  being  operated  by 
WA4WDL,  ft  has  receivers  for  10cm  and  3cm  along  with  a  solid  state  transmitter  for  5cni 
It  has  a  doppler  radar  system  for  anti-collission  research  and  has  the  capability  of  legally 
confusing  pohce  radar  units  * 


The  third  option  available  simply 
enables  clubs  to  buy  the  repeater  for 
St ,000  with  the  purchase  of  12  or 
more  FM-21  sets. 

The  repeater  is  leased  complete 
{except  antennae  and  feed  line)  with 
features  that  include  automatic 
identification,  all  solid-state 
construction,  and  built-in  timers.  It 
operates  at  10  to  15  watts,  uses  a 
Phelps  Dodge  duplexes  and  has 
approximately  Au  V  sensitivity,  It 
includes  an  ac  supply,  local  MICr  and 
metered  signal  strength. 

All  amateur  radio  clubs  are  invited 
to  contact  the  Clegg  Division  or  any 
Clegg  Dealer  if  interested  in  joining  or 
finding  out  more  about  the  updated 
Clegg  repeater  program.  Or,  they  may 
write  Carl  Jacobson,  National  Sales 
Manager,  Cfegg  Division,  International 
Signal  and  Control  Corporation,  3050 
Hempland  Road,  Lancaster  PA  17601, 
or  telephone  him   at  (717)299-3671. 

MINIATURE 
LICENSE 
COPIES 

In  an  effort  to  encourage  people  to 
get  the  AMATEUR  EXTRA  CLASS 
icense  and  to  reqard  those  who  have 
gone  to  the  trouble  to  get  the  license, 
a  Chicago  organization  has  decided  to 
jive  free,  without  any  charge,  an  exact 
photostatic  miniature  wallet  of  an 
Amateur  Extra  license  to  those  send- 
ng  in  their  original. 

Upon  receipt  of  the  original,  the 
iuplicate  will  be  made  and  returned 
ilong  with  the  unharmed  original 
vithin  about  a  week.  It  is  asked  only 
hat  a  self -addressed  stamped  envelope 
)e  included  for  return  of  the  original 
ind  the  wallet  duplicate. 

Amateur  Extras  only  should  send 
.heir  license  and  self  addressed  envel- 
ope to:  DUPLICATE  -  Amateur  Ex- 
tra 1 701  W.  Devon,  Box  6004 5,  Chi 
cago  IL  60660. 


73  MAGAZINE 


iSeto* 


ews  of  the  World 


73  MAGAZINE 


Twenty -nine  more  amateurs  licensed  in  Jordan*  Twenty- three  boy-  and    ix  girls  have  p        j  the  one  hundred  hour  study  course  and 
gotten  their  amateur  licenses.  The  call  for  the  club  station  is  JY6AC     keep  an  ear  peeled  for  them. 


JORDAN'S 
TOURIST 

AND 

VISITOR 

CALLS 


IY  Call        Home  Call       Name 


IY8AA 

IY8AP 
IY8BI 

IY8JK 

IY8MBB 

JY9AA 

IY9AB 

IY9AC 

JY9AL 

JY9AM 

JY9BB 

IY9DB 

IY9DC 

IY9DK 

1Y9DX 

JY9FB 

JY9FI 

JY9F0C 

1Y9GR 

JY9HF 

JY9HM 

IY9KS 

JY9MA 

JY9PP 

JY9SA 

JY9V0 

JY9WB 

JY9XL 

JY9YL 


W2NQS/1 

DJflAP 

DK2BI 

G3KP 

MP4MBB 

WA3HUP 

W3GE 

EP2JH-XYL 

9K2AL 

9K2AM 

W4TA 

WA2AD8 

WB6CYZ 

WA6FSC 

WA5VKJ 

EP2F8 

0D5FI 

G3FNF 

DJ9GR 

7Z3AB 

FL8HM 

WA2KBZ 

SU1MA 

DJ9PP 

ST2SA 

WA60PJ 

EP2WB 

FG7XL 

EP2YL 


Wayne  Green 
Majdi  Kurdiah 
Joachim  fmmelnktmpe 
John  Ray  Killeen 
John  Murdqch  Cooper 
Mary  Ann  Cnder 
Charles  C rider 
Karfa  Holmes 
Mohamad  2.  Ageel 
Johamad  S.  Bahhahani 
Bruce  B.  Blackburn 
William  C,  Black  ley 
Gerald  Holmes 
Darleen  A.  Souligny 
Richard  Harris 
William  Frisfaie 
Rachtd  Ednss 
Raymond  Hargreaves 
Ruediger  Geissfer 
Henry  Fatkeris 
Hassan  Ahmad 
Karl  Shulte 
Abdul  Moety  Attfya 
Karl  Bauer 
Dr,  Sid  Ibrahim 
George  Murray 
Wolfgang  Bauer 
J.  Pierre  Tendron 
ftoselyn  Fmbie 


U.S.  AMATEUR  FREQUENCY  ALLOCATIONS 


Extra 
Class 


Advanced 

Class 


CW  Only 

3,500-  3,775 
7.000  7.150 
14.000  l-J  200 
21.000-21  250 
2S.G00-28  500 
50.000-50.100 

3.525-  3  775 
7,025-  7.150 
14,025-14.200 
21,025-21,250 
28  00Q-2B.50Q 
50.000-50  100 


Novice 
Class 


Technician 
Class 


Phone  &  CW 

3.775-  4.000 

7  150-   7.300 

14.200-14.350 

21  250    21  450 

28  500    29  700 

50  100-54.000 

3,800-  4.000 
7.150-  7.300 
14.200-14.350 
2  T. 270 -2 1.450 
28500-29,700 
50,100-54  000 

3.890-    4.000 

7.225-    7.300 

14.275-14,350 

21,350-21.450 
28.500-29.700 

50100-54.000 


3.700-   3  750 

7.100-  7.150 
21.100-21  200 
28,100-28.200 

50.100      54.000,    I4&O0Q 
148  000t  220  MHz  band  and 
abcvf 


SSTV  Frequencies 

Suggested 


General 

3.525 

-    3,775 

Class 

7.025- 

-   7,150 

14.025- 

-74.200 

21  025 

21.250 

28.000 

-28  500 

3  775-  3.890 
7,150-  7,225 
14.200-14.275 
21,250-21.350 
28.500-29  700 
50  m0-.54.nnn 


3.845 

7.220 

14.230 

21.340 

28.680 


■     p     ■     - 


r       9      9       w      r 


LICENSE  FEES 

Initial  License 

Renewal  . 
New  Class 
Modification  *•**.* 
Special  Call  Sign  . 

Use    FCC    Form   610   and   mail   with 
appropriate  fee  10: 

Federal  Communications  Commission 

Gettysburg  PA  17325 


A        w        1 


-    *-     +     * 


.S  9 
.S  9 
.S  9 
.S  4 
.S25 


RECIPROCAL   LICENSING  Between 


U.S.  and:  CE  ■■  CP  -  CT1  -  CX    D 

■  El  - 

F     G - HB9- HC- HI  -  HK ■  HP 

HR  - 

LA  -   LX  -  OA  -  OH  -  PA  -  PY 

SM  - 

TG  -  Tl  -  VE     VR2  -  VU  -  YB 

YN  - 

YS  -  YV - ZL    ZP - 3A - 4X - 6Y 

8P- 

9K    9L-9Y. 

THIRD  PARTY  AGREEMENTS  Be- 
tween U,S.  and;  CE  -  CM  -  CO  CP  - 
CX  EL  HC ■  HH  HI  - HK  HR  JY 
-  LU  -  OA  PY  TG  -  Tl  -  VE  -  VO  • 
XE  XP  -  YN  ■  YS  -  YV  ZP  -  4X  42 
8R  -  9Y.  AlsoW/K/8P. 

RESTRICTED     COUNTRIES     (don't 
work)    are   now  down   to  only   Viet- 
nam(s)  3W8  and  XV,  with  the  excep 
tion  of  XV5AC  being  okay. 


DECEMBER  1973 


PR  TO  CONGRESS 

It  may  be  of  interest  to  amateurs 
who  want  to  help  their  hobby  that 
most,  if  not  all,  of  the  recent  repeater 
licenses  granted  by  the  FCC  have  been 
as  a  result  of  congressional  prodding. 
A  call  from  a  Representative  or  a 
Senator  seems  to  break  through  the 
Walker  quagmire  of  paperwork  and 
red  tape,  where  nothing  else  does. 

One  result  of  this  mess  is  that  there 
are  now  few  members  of  congress  who 
are  not  a  little  more  familiar  with 
amateur  radio  than  they  were  a  year 
ago.  We  want  them  to  be  even  more 
familiar  because  we  may  need  their 
help  in  getting  the  Walkerules  re- 
pealed. To  this  end  we  here  at  73  have 
prepared  a  short  paper  which  explains 
what  amateur  radio  is,  what  repeaters 
are,  what  our  basic  problems  are,  and 
how  congressmen  can  help.  Please 
send  a  sase  to  73  Magazine,  Peter- 
borough NH  03458  and  ask  for  the 
Congress  Paper  {two  sheets).  Send  this 
to  your  senator  or  representative  with 
a  note  asking  him  to  help. 


RADIO  AMATEURS  PLEAD  FOR  HELP  ! 

HUT  Ul    Mil 
■  UHT 

WHY  AMAIEU 

■v«  ,■*  •■  **  •>■ 

•^*IMB       ■■    .  1       fa.       *- 

AS  NEED  HELP 

^■■..■v   fa     en    in    i  ■ 

«  —  »»  ■  in     mm- 

'      i       -  ■  ■  ^-*fa>  ■* 

—  *       ■■     -  ■p^»»        mm 

mtmrnm,   * -mm,   . 

— '— **- 

1     ■     -^    H 

^^^  ■     if  p,  ■  w  w  fa/ 

^"B      i.      fa*      Mfai 

i    II      -     ■*    •  —     V    -V 

— --<     _      —     fa,                       1 

^^™"      »    ■     1.     h     VABBBBF 

fa*".fa-*    -faff   '    fH    l&    4.M 

fa^P^       MM    AW   B^Ml   ■% 

—  ■■             n    ^     .               faj- 

=^r\-r\r= 

*            1               *      |— fa      fa. 

"*ZZ 

»-+■*.*!■'       Trl-^rr 

'•■  faf  mmt  r  a»  hi  »■ 
*-*     -fa     fa*         ....    „ 

•  wmmwwm.     mm* 

■ .   .  •  fa,    .     ' 

•r  —  --— »■  -—  -¥ 

**   — - 

, ...    .  ._    _*    ■ 

aw    -«-»-'   \W~m  •**-■  **» 

»  H-fa*--          Ifal       «       ■  ■■« 

■-^  Hi  --  w. '  l-^nb  ,  f« 

lumi  fMr  ■**  ■—  •-■»■-  ■ 

■-    —■  ■**>-]  *MP-* 

Oip'hi-iv    imm     'm*r    Mm 
F,fa^.r>fc,h.«     hfaji  mkm 

*«»'■     «—    fa-     ..IT.--. 

i-ifm  iu  ,.^  *  _<  fa, 
■!■!«'       •■•*       - 

wt  *  wm  wmmw  rr-  twmm 

1 

j    i    -■*-  Ti1  '  i    ■»  — 

Mil                     Jj             .f«|B.| 

r.rin  p«J  rt-  -,—  ,     ,4,1%,  -■ 

MfetM                ■■"■           «             ■'■ 

■    mv,    «.t      pMfa-   iir" 
m  Uh-i  viwi  iiiit. 

•^^"*    -    ■*!  w#    w 

I'M*        »      -^*^        1  ll" 

faK    vk  -am**  -iu  -J  i 

t-i  in|fr  rinn-  *••     II  .w 

M       HH   --VI -iii  irip      ll   Hta 

•<—  ■  --w-i  -     ^■■fa» 
ppp.# 

The  recent  devest  at  ing  fire  in  Chel- 
sea (Boston)  brought  out  a  problem 
that  needs  some  thought.  Virtually  all 
of  the  communications  for  the  fire 
were  carried  on  over  two  meter  re- 
peaters, with  more  than  one  hundred 
local  amateurs  participating.  This  is 
the  stuff  that  we  need  to  feed  to  the 
news  media  and  to  congress. 

So  what  happened?  The  only  story 
written  about  the  event  was  sent  to 
ARRL  where,  presumably,  it  will 
eventually  end  up  in  QST.  Okay,  so 


EDITORIAL  BY  WAYNE  GREEN 


amateurs  will  know  how  great  ama- 
teur radio  is  —  but  congress  won't 
The  fact  is  that  only  73  sends  copies 
of  its  newspages  to  congress.  Right 
now  we  need  that  PR  with  congress  a 
lot  more  than  we  need  it  for 
self— congratulation.  If  you  or  your 
club  gets  involved  in  anything  which 
reflects  to  the  benefit  of  amateur 
radio,  please  see  that  it  is  written  up  — 
pictures  taken  —  and  send  it  to  73 
Magazine.  This  goes  for  small  services 
as  well  as  large  -  saving  one  life  or 
thousands* 

By  the  way,  the  CBers  tried  to  jam 
in  around  the  Chelsea  holocast,  but 
had  to  be  chased  away  since  they  had 
no  clear  channels  and  no  discipline. 
By  a  curious  quirk,  all  of  the  National 
Guard  radios  were  out  being  serviced, 
so  even  they  had  to  depend  upon  our 
repeaters. 

Let's  not  continue  to  hide  our  light 
under  a  bushel  —  and  let's  stop  de^ 
pending  on  QST  for  PR  —  only  73  is 
doing  amateur  PR  with  congress. 


EMERGING  NATIONS 

The  future  of  our  short  wave  and 
UHF  bands  lies  more  with  the  ITU 
than  anything  else,  the  current  224 
MHz  CB  proposal  notwithstanding. 
This,  in  turn,  means  that  the  very 
exi stance  of  amateur  radio  in  the 
future  depends  upon  the  value  placed 
on  it  by  the  governments  of  the 
African  and  Asian  countries  —  the 
so-called  emerging  nations. 

Is  anything  much  being  done  today 
to  prepare  for  the  inevitable  ITU 
conference  scheduled  for  the  1970's? 
The  answer,  unfortunately,  is  that 
very,  very  little  is  being  done. 

One  of  the  keys  to  getting  support 
from  these  countries  is  to  get  them 
involved  with  amateur  radio.  The 
hobby  has  enormous  benefits  for  any 
country,  if  only  the  leaders  knew 
about  it.  The  problem  is,  then,  how 
do  we  get  the  word  to  them? 

While  not  all  of  us  know  the  leader 
of  a  country  personally,  there  are 
more  amateurs  than  you  might  think 
that  do  get  to  talk  with  them  now  and 
then  -  one  approach  would  be  to 
make  sure  that  no  such  opportunity  is 
missed.  If  you  talk  with  an  amateur 
who  has  such  a  connection,  make  sure 
that    he    realizes    the   importance   of 


trying  to  get  amateur  radio  developed 
in  the  country. 

In  order  to  help  this  project,  we 
have  prepared  a  paper  which  explains 
the  benefits  of  amateur  radio  to  em- 
erging nations,  ending  with  the  ex- 
ample of  Jordan  and  the  develop- 
ments there.  Copies  of  the  paper  may 
be  had  by  sending  a  sase  to  73 
Magazine,  Peterborough  NH  03458 
and  asking  for  the  "Key  to  Communi- 
cations" paper. 


■»     —*.. 


COMMUNICATIONS 


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If  you  even  know  an  amateur  who 
may  be  visiting  a  small  country  and 
who  might  be  able  to  get  to  see  the 
president  or  king,  see  if  you  can  have 
a  copy  of  our  paper  in  his  hand  when 
he  leaves.  You  might  also  ask  ama- 
teurs in  the  rarer  countries  if  such  a 
paper  could  be  gotten  to  an  appro- 
priate level  if  you  sent  one  over,  Let's 
get  to  work  on  this  and  start  laying 
the  foundation  for  the  continuance  of 
amateur  radio  into  the  80's.  You 
might  also  be  responsible  for  hundreds 
or  even  thousands  of  new  hams 
sprouting  up  in  some  comer  of  the 
world,  thus  having  a  lasting  effect  on 
their  lives  and  the  future  of  their 
country. 

POSITIONS  OPENING 

As  73  Magazine  continues  to  grow, 
there  are  more  positions  opening  on 
the  staff.  The  work  is  fun  and  the 
work  atmosphere  perhaps  a  little  more 
relaxed  than  it  ought  to  be  —  and 
there  is  no  finer  place  to  live  in  the 
country  than  New  Hampshire  —  an 
area  famous  for  vacationing  four  sea- 
sons of  the  year. 

Our  needs  are  changing  constantly, 
but  at  present  we  are  looking  for  help 
in  editing,  circulation  and  advertising 
sales.  Salaries  are  generally  in  the 
$6000  to  $9000  range,  but  his  de- 
pends upon  experience.  Some  writing 
or  photography  experience  will  be 
helpful,  and  the  more  ham  experience 
the  better. 

Continued  on  page  17. .  , 


4 


73  MAGAZINE 


MAXIMIZE 
YOUR  AMATEUR  RAMO 


What  new  2M  FM  gives 
me  most  for  my  money, 
performance  vs.  price?  The 
answer's  as  clear  as  the  superb 
reception  you'll  get  on  the  new 
Standard  826MA,  10  watt,  2 
meter  FM  transceiver.  You'll 
find  such  outstanding  features 
as  12  channels —  with  the  four 
most  popular  ones  included  — 
and  a  RF  output  meter  with 
selection  of  1 0  watts  or  0.8  watt 
for  battery  conservation.  And  of 
course,  our  "Astropoint"  system 


MONEY. 


that  assures:  top  selec- 
tivity, great  sensitivity, 
and  rejection  of  unwanted  sig- 
nals on  today's  active  2M  band. 
Helfcal  Resonators  &  FET  front 
end  provide  the  performance 
needed  for  tomorrows  crowded 
channels.  Provision  for  tone 
coded  squelch  to  activate  mod- 
ern repeaters.  A  radio  that  won't 
become  obsolete.  Occupies  less 
than  200  cu.  in.  Weighs  lessthan 
5  lbs.  It  has  all  the  same  "Astro- 
points"  as  entire  Amateur  line. 


NEW  22  CHANNEL  BASE  STATION 
SRC-14U 

Ultimate  in  a  2M  FM  Transceiver  features: 

□  22  channels 

□  AC  &  DC  supplies  Built  In 

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□  VOX 

□  Three  Front  Panel  Meters 
D  Plus  many  more  exciting  features. 

For  detailed  information  on  these;  the  complete  Standard  line  and  the  name  of  your  nearest  dealer  write: 

Standard 

Communications  Corp. 

213/ 775-6284 -639  North  Marine  Avenue,  Wilmington,  California  90744 


DECEMBER  1973 


Dave  Ingram  K4TWJ 

Rte.  1 1 ,  Box  499,  Eastwood  ViL  SON 

Birmingham  A  L  352 1 0 


The  Slow  Scan  Program  Contest 
which  we  announced  in  October  to 
run  through  December  31,  1973  is  in 
full  swing  and  progressing  quite  well. 
There's  no  "wallpaper"  being 
awarded,  but  I'm  sure  you  could  find 
a  prominent  place  for  that  gear,  eh< 
Recapping  briefly,  this  is  a  contest  for 
the  best  SSTV  program  received,  (Use 
1  7/8  ips  cassettes.  .  ,6  minute 
maximum  time  limit  on  program.) 
Entries  will  be  judged  on  originality  of 
the  SSTV  program,  with  technical 
aspects  counting  in  the  scoring.  If  you 
haven't  sent  in  your  entry  yet,  do  get 
busy  and  give  it  a  try  —  turn  that  skill 
and  ingenuity  into  some  SSTV  gear. 
Be  sure  to  include  return  postage  for 
the  cassette  and  get  it  in  the  mail  to 
73  Magazine,  Peterborough,  New 
Hampshire  03458  so  we  will  receive  it 
by  December  31.  Results  will  be 
announced  in  this  column  and  maybe 
on  the  SSTV  net  the  first  of  January. 

VK9XX  of  Christmas  Island  and 
KG6KA  of  Guam  are  now  active  on 
20  meter  Slow  Scan,  and  VK9DJ  on 
Papua  is  set  to  go  except  for  a  crt, 
which  he  should  have  by  the  time  you 
read  this,  3D2AZ  and  3D2BJ  on  Fiji 
have  the  "SSTV  bug"  (thanks  to  some 
help  from  Barry,  VK5BS)  and  we 
hope  to  get  them  going,  even  if  on 
loaned  gear,  I  understand  Fiji  is  a  real 
paradise  and  natives  there  don't  get  in 
a  big  hurry  over  life,  (Gad!  Do  places 

like  that  still  exist?}  so  it  may  be  a 
few  months  yet,  .  .Down  Australia 
way,  VK6ES  now  has  a  vicicon 
camera  going,  and  VK7CD  has 
finished  his  W0.MD  Monitor,  while 
some  of  the  other  VKs  are  now 
starting  construction  of  a  W0LMD 
unit  They  also  report  growing  J  A 
Slow  Scan  activity  as  does  Bob 
WA7QBV,  who  passed  along  this 
month's  photo  he  received  from 
JA0BZC.  Fine  looking  gear. 

I  often  receive  inquiries  from  Slow 
Scan  newcomers  about  the  various 
SSTV  nets,  and  their  operating  pro- 
cedure. There  are  3  basic  world  wide 
nets:  the  U.S.  Net,  which  meets  on 
14,230  khz  at  1800  gmt  every  Satur 
day,  the  Australian  SSTV  Net,  which 
meets  on  14.230  khz  at  0100  gmt 
Sundays,  and  the  Canadian  SSTV  Net, 
which  meets  on  14,180  khz  at  2100 
gmt  Sundays.  Alt  three  nets  use  iila- 
tively  the  same  procedure,  so  I  will 
exemplify  the  U.S.  Net.  A  specific 
area  is  called  for,  (like  Eastern  United 
States,  or  Western  United  States  area) 


and  you  call  in  with  a  short  call  on 
SSB  only.  The  net  control  will 
acknowledge  each  station,  then,  in 
turn,  call  for  each  to  transmit.  Your 
transmission  should  begin  on  SSB 
with  the  usual  name,  QTH  bit 
followed  by  any  questions,  request  or 
items  of  interest  you  have.  Then  a 
brief  Slow  Scan  TV  transmission  from 
you  and  back  to  net  control.  (Rernenv 
ber  this  is  an  example  only,  not  a 
sterotyped  form,)  Should  you,  during 
the  course  of  the  net,  hear  something 
or  someone  of  interest,  there  is  a  time 
you  can  call  back  in.  Usually  the  net 
control  makes  this  obvious  with  some- 
thing like  "any  comments  on  the 
previous  transmission  by.  .  /'  Often 
conversations  on  or  near  the  net  be- 
come quite  technically  involved,  and 
much  information  (and  new  ideas!)  is 
exchanged-  Here  you  must  remember 
Slow  Scan  is  the  newest  and  most 
sophisticated  mode  today  and 
advancements  are  happening  so  fast 
often  even  the  magazines  can't  keep 
abreast.  In  fact,  most  of  the  net 
controls  are  set  up  for  I.S.B.  and  I 
suspect  we  will  soon  see  more  of  this 
on  the  net  also. 

While  on  the  subject  of  newcomers, 
here's  a  couple  of  "Rambling 
thoughts"  worth  mentioning. .  ,SSB 
DXers  can  usually  spot  DX  by  the 
wavering  audio  and  speech  accent. 
Slow  Scan  TV  DX  (which  syncs  from 
50  Hertz  lines)  is  obvious  to  the  ear 
because  their  sync  pulses  are  running 
slightly  faster,  and  while  viewed  on 
the  screen  their  pictures  are  not  as 
wide.  The  next  time  you  see  DX 
pictures,  make  a  mental  note  of  these 
points,  compare  them  with  U.S.  pic- 
tures (60hz  line  frequency)  and  you'll 
see  what  I  mean. 

A  while  back,  I  mentioned  the  fact 
various  P7  crts  had  different  degrees 
of  persistence  I  some  far  too  short  for 
Slow  Scan  TV)  and,  as  a  result,  many 
of  the  fellows  considered  using  only 
RCA  tubes  as  an  alternative.  But  what 
about  those  JJhamfest  specials"  one 
invariably  runs  into?  One  quick  way 
you  could  check  their  persistance  is  to 
hold  a  quick-made  transparency 
(sketch  on  cellophane  paper  with  a 
felt  pen)  over  the  screen,  expose  to 
the  sunlight  a  second  or  two,  remove 


the  slide,  then  view  iin  a  dark  area,  or 
cover  crt  face  with  hands,  etc.  Make 
sure  your  eyes  are  accustomed  to  dim 
light  while  checking  the  persistence. 
In  a  pinch,  you  could  just  lay  a  couple 
of  fingers  on  the  crt  face  for  the 
"slide"  effect.  A  good  P7  crt  will  hold 
an  image  like  this  the  same  as  if  it 
were  a  regular  Slow  Scan  picture. 

Finally,  Franco  I1LCF  and  CQ 
Elettronica  of  Italy  are  presently  con 
ducting  two  contests:  one  for  the  best 
quality  pictures  exchanged  over  the 
air  on  SSTV  and  the  other  for  the 
longest  distance  covered  by  SSTV. 
Send  photos  and/or  tapes  to  Franco, 
I1LCF.  Sorry,  I  don't  know  the  dead- 
line or  prizes  yet. 


Shack  layout  of  JAQBZC,  The  SSTV  gear  at 
the  left  and  all  the  other  equipment  besides 
the  FT-  200  is  homebrew. 


Bill  Turner  WA0ABI 
Five  Chestnut  Court 
St  Peters  MO  63376 

WB2LGD  says  August  was  poor 
except  for  the  10th,  worked  Alabama, 
Florida,  Mississippi,  Ohio  and  Cal 
fornia  from  13/30  to  17/30Z.  Bo^ 
and  Mike  W2FND  attended  the  East 
Coast  VHF  Society  antenna  measuring 
contest  in  Trenton,  NJ-,  returned  to 
Mike's  QTH  and  worked  8P6EN,  Bob 
went  to  his  home,  turned  on  the  rig 
and  worked  WA7FSI/7  in 
Idaho. .  .and  is  still  wondering  what 
he  missed* 

WA1EXN  notes  6  days  of  skip  in 
August,  September  contest  poor  until 
Aurora  at  1900Z,  Worked 
2-3-4-8-9-VE2-3  on  SSB  until 
2300Z,  then  worked  another  hour  on 
CW  after  SSB  faded.  Art's  comment 
on  SB— 110  noise  limiter  capacitor 
change  (to  200pf)  "all  I  can  say  rs 
beautiful."  Art  also  says  a  12GN7A 
makes  a  good  substitute  for  12BY7s. 
No  more  output  but  a  lot  more  stable 
and  lasts  a  lot  longer. 

W0YZS  told  me  at  the  Central 
States  VHF  conference  in  Bloom- 
ington,  Minnesota  that  he  expected  to 
have  the  antenna  back  up  within  2 
months  -  have  not  heard  him  yet 
Andy  VE4MA  is  moving  to  VE6  with 
his  50MHz  gear,  son  Barry  will  remain 
active  as  VE4MA  but  only  on  the 
higher  frequencies.  It  was  a  pleasure 
to  meet  W7JRG  and  W7VDZ  after 
years  of  talking  to  them,  also  enjoyed 
several  hours  conversation  with 
KttJLUts,  K5WVX  and  K5BXG  while 
mobifing  from  Minneapolis  into  Iowa. 
W0PFP  commented  that  we  had  not 
talked  on  the  air  for  several  years  so 
we  made  up  for  lost  time  in  the 
Marriott  bar  and  managed  some  fur- 


73  MAGAZINE 


ther  comments  via  Aurora  during  the 
contest, 

Mac  W0GNS  attended  to  lend  an  air 
of  respectability  to  the  proceedings  as 
did  K0RIR,  WA7FP0  and  W1HDQ. 
Ed  presented  a  slide  program  featuring 
the  VHF  triumphs  of  the  40's  and 
50's.  Dick  K2RIW  presented  a  most 
interesting  talk  on  external  anode 
amplifier  design,  while  Mel  W2BOC 
treated  us  to  the  fruits  of  his  labors  in 
documenting  Es  over  the  past  several 
decades.  Hoppy  WB4BND  was  in  at- 
tendance wearing  a  J,73"  button  and 
chewing  his  ever  present  seegat\  Hope 
to  see  you  in  Colorado  next  August, 

I  attended  a  meeting  of  the  Ama- 
teur Radio  Technical  Society  of  St. 
Louis  last  spring  during  which  it  was 
suggested  that  perhaps  readers  of  this 
column  would  be  interested  in  a 
ground  plane  designed  and  used  by 
club  members.  By  minor  adjustment 
of  dimensions  this  antenna  could  be 
used  in  the  SSB,  AM  and  FM  portions 
of  the  band  and  best  of  all.  the  parts 
are  inexpensive  and  readily  avail- 
able. 

WA0ABI 


CONTESTS 


Tom  DiBiase  WB8KZD 
708  6th  Avenue 
Steubenviiie  OH  43952 


DEC  1-3 
DEC  15-16 

FEB  9-10 


CONTESTS 

Delaware  QSO  Party 

EA  (Spanish) 

Contest  CW 

Ten— Ten  International 

Net  Contest 


THIS  MONTH 
Delaware  QSO  Party 

From  0000Z  DEC  1  to  0000Z  DEC 
3.  Stations  may  be  worked  only  once 
per  band  regardless  of  mode.  Ex- 
change QSO  nr.,  RS/T  and  QTH  (DE 
county  or  state/province/country .) 
Freqs.:  3560,  7060,  14060,  21060, 
28160,  3975,  7275,  14325,  28650, 
50.4,  145,2,  21120,  28160.  DE  stns. 
score  IpL  per  QSO  and  multiply  by 
nr*  states/provs7cntrys.  Non-DE  stns. 
score  5pts«  per  DE  QSO  and  multiply 
by  1  for  1  DE  county,  by  3  for  2 
Counties,  and  by  5  for  3  counties 
(New  Castle,  Kent,  and  Susses).  Ap- 
propriate awards.  Mail  logs  with  SASE 
if  award  &  results  desired  to  John  R. 
Low  K3YHR  before  JAN  15,  1973. 
ADR  is  11  Scottfield  Drive,  Newark 
DE  19711. 


EA  (Spanish)  Contest  CW 

From  DEC  15  at  2000Z  to  DEC  16 
at  2000Z.  Send  six  digit  QSO  and 
RST  combination  (eg.  599001, 
579002  etcj.  US  stns.  score  2  pts.  per 
QSO  with  EA  District  stns.  US  stns. 
multiply  total  QSO  pts.  from  each 
band  by  total  EA  Districts  worked 
from  each  band.  Logs  should  include 
dates,  times,  bands,  stations  worked, 
exchanges  sent  &  recieved,  QSO  pts, 
and  new  mulitpliers.  A  summary  sheet 
is  also  required  with  point  info  & 
declaration  etc.  These  must  be  re- 
ceived by  JAN  16  and  the  ADR  is 
URE  1973  International  Contest,  P.O. 
Box  220,  Madrid,  Spain,  If  you  can 
read  Spanish  better  than  I  can,  write 

them  for  complete  details, 

WB8KZD 


BUI  Pasternak  WA2HVK/6 
14732  Blythe  Street  #  17 
Panoramg  City  CA 

What  has  become  of  Larry?  You 
know,  "CB  Larry",  the  menace  of 
New  Mexico.  Larry  is  the  heaxter  who 
popped  up  on  1 1  meters  one  day 
yelling  for  help.  He  claimed  he  was 
trapped  in  an  overturned  vehicle  some 
place  in  the  Monzano  Mountains 
southeast  of  Albuquerque.  Immed- 
iately, some  200  rescuers  and  22 
search  planes  were  organized  and  a 
thorough  search  of  the  area  was 
begun.  As  reported  in  Newsweek  of 
September  10,  1973  (Page  53,  titled 
''Blabbermouths")  the  search  lasted 
five  days  but  failed  to  turn  up  any 
trace  of  the  distress  caller.  The  net- 
work media  covered  the  event  from 
start  to  finsih  white  the  country 
waited  for  word  of  a  rescue.  It  was  a 
hoax!  An  expensive  hoax  if  you  con- 
sider what  the  rescue  effort  probably 
cost  the  taxpayer. 

The  story  does  not  end  there.  Not 
content  with  his  original  escapade,  he 
re— appeared  on  11  meters  again,  this 
time  to  take  credit  for  his  original 
deed.  As  if  that  were  not  enough, 
according  to  Newsweek  the  language 
he  used  at  that  time  was  the  type  that 
might  make  the  proverbial  sailor 
blush.  So  far  he  has  gotten  away  with 
it*  This  incident  has  finally  brought 


the  problem  of  the  mess  on  1 1  meters 
to  the  eye  of  the  American  public. 
While  we  in  amateur  radio  have 
known  of  the  CB  problem  for  years 
and  have  tried  in  vain  to  get  the  FCC 
to  do  something  about  it,  now  the 
situation  has  reached  just  about  every 
livingroom  in  the  country.  Incidents 
such  as  these  point  out  dramatically 
why  the  Citizens  Radio  Service  should 
not  ever  be  permitted  to  expand, 
especially  into  the  amateur  bands.  If 
they  cannot  police  themselves,  and 
the  FCC  is  not  willing  to  do  so  on  a 
large  national  scale,  then  the  service  is 
totally  useless  and  should  be  phased 
out  as  soon  as  possible.  I  strongly 
recommend  that  every  amateur  ac- 
quire a  copy  of  the  afore  mentioned 
Newsweek  article  and  read  it.  It's  an 
excellent  journalistic  effort  and 
worthy  of  commendation.  As  for 
"Larry",  well  we  can  only  hope  that 
he  will  be  caught  and  punished. 

I  have  spent  a  lot  of  time  in  New 
Mexico  in  the  past  few  years  and  have 
a  number  of  friends  living  there.  My 
wife  Sharon  and  I  spent  part  of  our 
honeymoon  there  and  we  again  visited 
the  Albuquerque  area  while  en— route 
to  California  last  year.  Though  there 
are  a  number  of  repeaters  in  the  area, 
the  only  one  I  had  rocks  for  was 
WA5JD2  located  west  of  the  city  atop 
Ml  Taylor.  This  is  an  open  ,34/.94 
machine  with  possibly  the  most  dis- 
tinctive identifier  I  have  ever  heard.  It 
is  also  one  of  the  friendliest  repeaters 
I  have  ever  come  across  and  the 
amateurs  that  operate  it  went  out  of 
their  way  to  make  our  five  days  in  the 
"Duke  City"  an  event  we  will  find  it 
hard  to  forget.  The  repeater  covers  the 
area  along  I— 40  quite  well  from  about 
70  miles  east  of  Albuquerque  and  we 
were  still  hearing  it  on  our  IC— 2F 
when  we  approached  the  Arizona  bor- 
der. With  a  10,000  foot  mountain 
under  your  machine  you  can  cover  a 
lot  of  miles.  Since  I  am  planning  to 
expand  LW  to  encompass  the  entire 
Southwestern  United  States,  I  would 
enjoy  hearing  from  the  Albuquerque 
group  and  any  other  repeater  people 
in  the  area. 

Back  home  in  LA,  I  had  the  honor 
to  be  invited  for  a  tour  of  the  brand 
new  L,A.  County  Sherrifs  Commun- 
ications Center,  a  good  part  of  which 
is  devoted  to  amateur  radio.  While 
many  cities  have  abandoned  or 
shelved  amateur  radio  as  a  communi- 
cations system,  Los  Angeles  has  taken 
just  the  opposite  view.  They  realize 
the  value  of  a  well  organized  RACES 
communications  network  and  its  value 
in  time  of  emergency  and  have  backed 
up  their  opinion  with  facilities  and 
equipment  to  implement  the  system. 
My  guides,  Lou  Scherer  WB600N  and 
Sgt.  Frank  Oakden  spent  quite  a  bit  of 
time  explaining  the  new  system  and 


DECEMBER  1973 


magazines 


6  minute  maximum  time  length 

Subject  matter  is  limited  only  to 
your  imagination  —  anything  goes. 

Label  cassette  with  your  return 
address  and  include  sufficient  re- 
turn postage.  All  programs  will  be 
returned. 

Decisions  of  the  judges  will  be 
final. 

Contest  starts  now  —  entries  must 

be    mailed    before    December  31,1973 


Prize 


ROBOT  Model  61 

Fast  Scan  Viewfinder 

Other  prizes  to  be  announced. 


Send  your  entry  to:  Slow  Scan 
Contest,  7  3  Magazine, 
Peterborough,     NH     03458. 


asked  if  I  would  mention  that  they  are 
looking  for  recruits,  some  5,000  of 
them!  If  you  are  an  amateur  of 
Technician  cfass  or  higher,  and  live  in 
any  area  served  by  the  LA  County 
Sheriff's  Department,  this  might  inter- 
est you.  Contact  the  LA  County 
Sheriff's  Department  for  more  infor- 
mation, 

L.W.  wishes  to  congratulate  Walter 
Braunstein  W6EJK  on  his  election  to 
the  Presidency  of  the  Pallisades 
A,  FLC,  of  Culver  City.  They  are  with- 
out a  doubt  the  most  active  amateur 
club  in  Southern  California,  and  have 
found  many  ways  of  involving  ama- 
teur radio  in  their  daily  lives.  Their 
repeater  WR6ABB  was  set  up  as  thier 
club  station,  available  to  all  members 
at  all  times,  I  received  the  honor  of 
being  asked  by  Walt  to  become 
co-chairman  of  the  club  TVI  com- 
mittee, along  with  Martin  Geisler 
WA6TIC  who  has  done  quite  a  job  in 
that  position  for  a  long  time.  If  I 
come  up  with  any  interesting  cases  or 
cures,  I'll  be  glad  to  pass  them  along. 

Since  the  holiday  season  will  soon 
be  upon  us,  Sharon  and  I  wish  to  take 
this  opportunity  to  wish  you  all  the 
best  of  holiday  wishes  and  we  will  be 
seeing  you  in  the  New  Year, 

WA2HVK/6 


FORT  WAYNE  HAMFEST 

A  Hamfest  will  be  held  in  Ft 
Wayne  IN  on  13  January,  I974  at 
Shiloh  Hall  on  Carroll  Road,  west  of 
IN~3;  flea  market  -  food  -  807's  - 
softies.  $1  in  advance  —  St. 50  at  the 
door.  Tables  —  4  feet  $1* 

For  info  write:  A.C.  Arts,  PO  Box 
342,  Ft.  Wayne  IN  46801.  Talk  in 
94/28  -  88/52.  Electronics  equip- 
ment only  please. 

KITTY  HAM 

December  17th,  1973  marks  the 
70th  anniversary  of  the  first  powered 
flight  which  the  Wright  brothers  made 
at  Kitty  Hawk,  North  Carolina. 

The  Raleigh  Amateur  Radio 
Society  and  amateurs  from  the  Kitty 
Hawk  area  will  operate  special  event 
station  KH4NC  at  Kill  Devil  Hill 
which  was  the  site  of  the  historic 
flight. 

Operation  of  the  special  event  sta- 
tion is  in  commemoration  of  that  first 


powered  flight  by  the  Wright  brothers 
which  marked  the  birth  of  modern 
day  aviation. 

Proposed  operations  will  be  con* 
ducted  from  0000  GMT,  15  December 
through  2400  GMT,  17  December 
1973.  Frequencies  to  be  used  will  be 
3530,  7030,  14030,  21030  and  28030 
kHz  -  CW,  and  3910,  7210,  14280, 
21355,  and  28505  kHz  phone.  Note 
that  these  frequencies  are  approxi- 
mate and  amateurs  should  listen  on 
these  frequencies  plus  or  minus  10 
kHz,  Some  operating  time  will  be 
devoted  to  the  novice  class  sections  of 
the  above  bands.  In  addition  to  these 
operations,  an  Oscar  satellite  ground 
station  will  be  set  up  for  possible 
contacts  through  Oscar  6, 

A  special  commemorative  QSL  card 
will  be  available  to  stations  contacting 
KH4NC,  SASE  please,  via  K4CIA,  PO 
Box  17124,  Raleigh  NC  27609. 


WIN  HAMFEST 

The  winter  PICON  ET-HANDI-HAM 
hamfest  will  be  held  Saturday  Decem- 
ber First  1973  at  the  Eagles  Club  in 
Fairbault  MN.  There  will  be  a  dinner, 
program  and  prize  drawing.  Registra- 
tion starts  at  9AM.  Contact  Don 
Franz  W0FIT,  Secretary -Treasurer 
PICONET,  1114  Frank  Ave.,  Albert 
Lea  MN  56007. 


8 


73  MAGAZINE 


Gus   Browning   W4BPD 
Drawer   "DX" 
Cordova.   SC  29039 

DX  is  back  with  us  again,  here  it  is 
wintertime  and  the  bands  are  full  of 
some  mighty  good  DX  again.  Better 
get  in  there  and  join  in  on  the  fun- 
According  to  one  of  the  propagation 
predictions  editors  of  one  of  the 
magazines  the  sun  spot  cycle  may 
pass  through  its  minimum  some  time 
this  winter.  I  am  sure  we  all  hope  he 
is  correct  in  his  "prediction*1  It's 
pretty  tough  sledding  when  those 
sun  spots  are  at  a  very  low  count. 
W3AG  has  moved  over  to 
Greece  and  it  looks  like  he  will  be 
there  from  "now  on"  and  (get  this) 
he  lives  only  about  25  or  so  miles 
from  the  border  of  Mt.  Athos  ! 
It  seems  it's  easier  to  get  a  Mt  Athos 
license  than  a  SV  license,  because  he 
is  now  on  the  air  in  Mt.  Athos  with 
the  call  SY5MA  and  is  working  the 
boys,  especially  a  lot  on  CW.  In 
case  some  of  his  old  buddies  want  to 
drop  him  a  line  over  there,  here  is  his 

address  (in  Greece); 

Willard  Hunton, 

c/o  Mrs.  Loch,  The  Tower, 

Ouranoupolis,  Greece 
Willard  tells  me  in  a  letter  that  he 
will  hang  out  around  the  portions  of 
the  bands  where  Generals  or  anyone 
else  can  work  him.  His  QSL  manager 
is  W4KA,  and  Willard  will  send  his 
logs  back  every  two  weeks  so  the  QSL 
cards  will  go  out  pronto. 

Anticipated  hours  of  operation 
will    be:      0600-0800;   1000-1200;  & 
1400-1600  GMT.     Will  also  use  the 
low   end    around    14010,  21010  etc. 
(ed,-l   predict   ML  Athos  will  shortly 
be  removed  from  the  rare  country  list). 
There  seems  to  me  quite  a  bit  of 
activity  around  the  Indian  Ocean  with 
the  fellows  from  the  Seychelles  going 
to  some  of  the  outlaying  islands  on 
DXpeditions,     I  suggest  that  those  of 
you  who  need  this  area  keep  in  touch 
with    the    gang    in    Mahe,   Seychelles. 
They  can  tell  you  of  their  future  plans. 
We  all  hope  they  continue  to  do  thts. 
My  only  regret  is  that  I  am  not  with 
them,  sure  would  be  nice  to  see  those 
beautiful  islands  again. 

Have  just  about  got  a  new  country 
list  made  up  for  our  WTW.  By  count- 
ing the  places  various  National  Assoc- 
iations counts  the  new  total  will  be 
something  around  375  to  400  or  so. 
You  had  better  start  looking  real 
close  at  all  those  Russian  cards,  a 
number  of  them  will  be  added  to  our 


list,  also  quite  a  new  more  under  FOS, 
and  still  a  few  more,  here  and  there, 
A  SUPER  WTW  ?  !  Am  considering  a 
new  award  that  will  be  called  the 
"SUPER  WTW"  !  Am  not  sure  yet 
that  the  "Boss  Man,r  {Wayne  Green) 
will  go  along  on  this  or  not.  The  idea 
this  award  is  to  have  "lots"  of  DX 
areas  on  the  list,  almost  any  island 
(3ven  Catalina,  Long  Island,  etc.  and 
count  evsn  every  state  in  the  USA, 
ev3ry  province  in  Canada,  every- 
Helvetta  in  Switzerland,  every  district 
(licensing  district)  in  South  Africa, 
every  district  in  Australia,  etc.  etc. 
You  could  really  say  that  you  have 
Worked  The  World  if  you  were  the 
Top  Man  on  the  Super  WTW  Honor 
Roll!  We  would  start  an  Honor  Roll 
each  month  for  "our"  Super  WTW. 
I  would  think  such  an  award  would 
be  an  award  to  stop  all  other  awards! 
How  does  that  strike  you  fellows  who 
want  'Veal  activity"  on  our  bands? 
Am  sure  I  will  hear  from  the  gang  on 
on  this!  I  can  just  hear  'em  now,saying 
that  crazy  fool,  Gus  is  about  ready 
for  the  Bug  House  and  a  strait  jacket! 
Our  WWDXA  (World  Wide  DX 
Association)  is  coming  along  very  FB. 
At  the  time  of  writing  this  the  mem- 
bership is  getting  up  near  50  I  would 
guess,  and  growing  each  day.  Every 
$  6-00  yearly  membership  fee  has 
been  put  in  the  bank  and  as  long  as  I 
can  stand  it  will  continue  to  be  put 
there  to  be  used  only  for  the  better- 
ment of  DX  when  the  occasion  arises. 
Before  we  start  tapping  this  account 
we  want  a  very  sizeable  amount  in  the 
bank  first.  You  can  be  sure  the 
"occasion*'  will  have  to  be  a  good  one. 
I  have  often  wondered  why  a  small 
low  powered  rig  with  a  very  make- 
shift antenna  with  a  high  SWR  will 
Work  The  World  with  >fery  nice  signal 
reports  from  a  DX  spot  and  the  very 
same  rig  back  "home"  will  not  even 
get  a  CQ  answered  ?  I  guess  it's  that 
20db  "added"  signal  report  you  have 
when  you  are  DX,  the  rarer  the  spot 
the  more  db's  your  signal  will  havet  or 
it  certainly  seems  like  to  me,  but, 
every  time  I  think  of  low  power  I 
think  of  Howie,  W2QHH  and  all  the 
awards  and  certificates  that  he  has 
earned.  Howie  is  not  in  a  rare  state. 
(N.Y.  State  is  not  rare  to  anyone). 
W2  is  not  a  rare  call  area,  Howie  was 

letter  carrier  (mail  man)  when  he  got 
most  of  those  FB  awards  which  means 
that  he  could  not  "sneak"  home  to 
get  a  new  one  when  it  showed,  all  this 
and  usually  only  a  dipole  or  long  wire 
(actually  you  and  1  would  call  it  a 
short,  long  wire),  and  he  lived  in  a 
(and  still  lives  there  as  far  as  I  know) 
small  New  York  village  in  a  sort  of 
valley.  His  power  has  never  exceeded 
75  watts,  usually  was  around  35  watts, 


I  even  worked  him  from  AC3PT  ! 
(he    was    RST   339   on   21    mc   CW). 

To  me  this  only  goes  to  prove  that 
you  can  "do  it"  on  low  power,  but 
a  tot  of  good  friends  and  some  letters 
undoubtly  helps  a  bit  too.  and  a  lot  of 
good  down  to  earth  planning  and 
being  "very  persistant"  for  that  new 
one,  I  guess  in  the  end  its  the  operator 
more  than  anything  else  that  gets  the 
results.  Anyway,  my  hat  is  off  to  him. 
Howie  may  have  done  it  the  hard  way, 
BUTt  he  got  the  job  done,  and  how  ! 

We  are  still  in  need  of  some  radio 
clubs  in  various  parts  of  the  country 
to  act  as  verification  points  for  the 
WTW  award.  If  your  club  <&  interested 
in  this  small  task  drop  me  a  tine  and 
lets  get  together.  Your  club  will  get  a 
little  publicity  when  we  list  our  veri- 
fication points  occasionally  in  this 
magazine,  very  little  actual  work  in- 
volved. How  about  your  club  joining 
up   with   us  on   this   little   project  ? 

Have  attended  quite  a  few  convent- 
ions around  the  country  this  year  and 
all  the  fellows  want  more  and  better 
DX  on  the  air,  they  would  like  to  have 
more  "professional"  DX  operators  on 
the  other  end  of  the  pile-ups  and  if 
possible  more  activity  when  the  DX 
station  actually  gets  on  the  air  from 
the  rare  spots  and  when  it's  all  over 
a  "speedy"  QSL  would  make  the  hunt 
a  very  FB  success  to  the  whole  thing. 
Without  that  all  important  QSL  card 
for  verification  purposes  the  whole 
chase    becomes  more  or   less  useless. 

If  any  of  you  happen  to  know  of  a 
DX  station  that  is  looking  for  a  State- 
side QSL  manager  let  me  know  be- 
cause I  usually  have  a  number  of 
stateside  hams  who  would  like  to  be  a 
QSL  manager  for  DX  stations  (ed.- 
they  can  have  that  job  and  all  the 
hard  work  that  is  involved}* 


It  is  with  deep  regret  to  announce 
the  death  of  W3GHD,  Bob  Wilson  on 
September  9th  after  being  in  the  hos- 
pital only  3  days.  Death  was  the 
result  of  a  stroke  Bob  suffered, 

The  DX  world  has  lost  one  of  it's 
great  operators  and  a  very  active  ham. 
Bob  was   a   personal   friend  of  your 
itor    and    will    be    missed    by    all. 


Understand  that  Wayne  went  to 
the  hospital  for  examination,  sure 
hope  it's  nothing  serious  and  is  back 
on  the  job  again  by  now. 

SAY  GANG,  some  of  the  applicants 
for  both  WTW  and  73-73-73  award  is 
not  sending  the  $  1-00  fee.  This 
slows  things  downt  so,  how  about 
remember  this  fellows  and  save  me 
time  and  work  ?   Many  Thanks, 

73  es  DXr  CU  next  month,  de4w*-BPD 


DECEMBER  1973 


HEFEATEH  ATLAS  REGISIHAIION 


REPEATER  CALL   (WR  only) 

FORMER  CALL 

LOCATION  (City) 

STATE 

INPUTS 

OUTPUTS 

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TB   PL 

FM    AM 
RTTY 

AUTO 

PATCH 

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1  USEFUL  RANGE  (RADIUS) 

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1                                                                    D  SPLIT  SITE 

1  ANTENNAS  &  HEIGHT       Ddiplexeh 

Hi 

REPEATER  GROUP/SPONSOR 

TRUSTEE 

ID-TYPE  OR  MFR. 

Or   cftrtfty   tKat   1  riovo  received 
no  Outside  ^sistanne  wtiile  com 

DATE 

SOURCE  ( 

NAME/Cy 

ML) 

SPECIAL  OR  EMERG 

ENCY  FUNCTIONS 

fREPEATER  UPDATE 

fTlSTENING  "  ~~ 

54  76  88  73  70  64  82.  .  ._ 


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INTRUDER  1 
CHASE     I 


AZ 

WR7ABQ 

Phoenix 

AZ 

WR7ABR 

Phoenur 

AZ 

WH7AB5 

Pho?!i  < 

AZ 

WR7ABT 

PtlOWIIX 

CA 

WR6ACF 

San  Diego 

CA 

WR6ACA 

LA 

CA 

WR6ABT 

WtflL  A 

CA 

WRfiACO 

LA. 

CA 

WRfiACJ 

L  ■  r%  * 

CA 

WflfiABO 

L,A. 

CA 

WHHABW 

LA. 

CA 

WflBABI 

LA 

CA 

WR6ABA 

™p'"^i 

CT 

WRlACD 

Monro? 

Fi 

WR4ACZ 

Penncdta 

GA 

WB4A8N 

Atlirtti 

GA 

WR4ACX 

Eaton  ran 

(A 

WRIACF 

Ayrshire 

ID 

WR7ABX 

Mcticdw  Mtn. 

IL 

WR9ABV 

Chicago 

IN 

WR9ACG 

Plymouth 

KS 

WFiBABZ 

Winfirclri 

MA 

WRlABX 

Holy  tike 

MA 

WfllABY 

Miyn<iPtf 

MA 

WfllACe 

Btllinfhim 

HC 

WR4AQN 

Elizabeih  City 

NY 

WR2AC3 

Long  hianrf 

NT 

WR2ACI 

ValhilU 

NY 

rlnZnK.  R 

GlovtfP/illi 

TN 

WR4ADF 

Knoxvillf 

146,3414694 
146.16  146  76 
146.04146  64 
4493-445  3 
146.22  146B2 
146  04146  64 
RTTY  146.1CH46.7IJ 
Closed 

1 46 IM  46.82 
146.Z5-146.BS 
14634  146,94 
Closed 
Closed 

147 .81 -147.21 
146  ,235  146.835 
146.16-146.76 
147.61147  Q3 
146.10  146  70 
146  22  146  B2 
146  22  146  82 
146.16  14676 
446J5443.75 
146.07  146.G7 
146.16146.76 
146.34-146  04 
147J4-147.24 
14a  4614706 
146.28146  88 
146.16  146  76 
147.66-147.06 
146,16  146  76 
52.76-52.525 
146  34  146  94 
449,3444.3 


Jonathan  Tara  WB8DBN 

1626Q  Greenfield 

Detroit  Ml  48235 


Contrary  to  popular  opinion,  there 
are  several  things  you  personally  can 
do  to  rid  our  bands  of  intruders,  If 
you  wait  for  someone  else  to  do  it, 
their  numbers  will  just  continue  to 
mount. 

First  off,  you  can  write  a  letter  to 
the  offending  station.  Don't  laugh,  it 
works  -  sometimes.  You  may  think 
that  the  station  obviously  knows  that 
it  is  operating  illegally  and  that  your 
letter  will  wind  up  in  the  proverbial 
circular  file.  On  the  contrary,  the 
station  is  not  technically  in  violation 
of  international  regulations  until  it  has 


TN 
TX 
VT 
WA 


WR4A0O 
WR5ACF 
WR1ACA 

WR7ABZ 
WR9ABF 


Kiiupport 

Luftin 

Mr  Attuirwv 

Yakima 

v  hMakm 


PL 
PL 


146  16  146.75 

146.34446.94 
146,16146.76 
146  34446.94 
52  8U52  5Z5 
147.99-147.39 
449  5  4445 
IZSDO  1Z2E3.0 


been  totd  that  it  is  causing  interfer- 
ence. It  may  be  obvious  to  you  that  a 
megawatt  on  7250  beamed  to  North 
America  is  going  to  cause  trouble,  but 
the  broadcast  station  will  take  full 
advantage  of  this  technicality.  The 
truth  is  that  these  stations  seldom  get 
complaints.  You  may  be  surprised  and 
get  immediate  satisfaction  —  the  BBC 
agreed  to  reduce  the  level  of  their  20 
meter  second  harmonic  by  6dB  in 
response  to  a  letter  from  me.  In  other 
cases  it  may  be  slower  —  Radio 
Moscow  invited  me  to  send  them 
tapes  showing  interference  caused  by 
their  transmissions.  ("We  shall  be  glad 
to  receive  a  cassette  tape  record- 
ing. .  .please  make  it  7  1/2  i.p.s.") 

Keep  the  technicalities  of  the  inter- 
national  regulations  in  mind  when  you 
write  the  letter.  You  won't  get  any- 
where by  accusing  the  station  of 
operating  illegally.  The  thrust  of  your 
letter  should  be  to  inform  them  that 
they  are  causing  interference  to  hams 
with  their  transmissions.  It  doesn't 
hurt  to  mention  that  they  will  be  in 
violation  of  international  regulations 
if  they  continue.  This  way  they  know 
that  you  are  familiar  with  the  regula- 
tions, so  they  have  to  be  more  careful 
in  answering  you. 

Be  sure  to  give  full  details  of  the 
transmission,  and  include  a  tape  if 
possible.    Check    the   address   of   the 


10 


73  MAGAZINE 


FCC 

MONITORING 
STATIONS 

Address  your  report  or  complaint 
to  "Engineer  in  Charge,  Federal  Com- 
munications Commission,  (name  of 
city)  Monitoring  Statton/'at  the  vari- 
ous addresses  given  below,  listed 
alphabetically  by  city  or  town.  The 
telephone  number  for  each  monitor- 
ing station  is  also  listed, 

P.O.  Box  89 
Allegan  Ml  40901 
(6?  6-073*2063) 

P.O.  Box  1 1  26 
Denison  IX  75020 
(Ambrose  Monitoring  Station) 
(214^965-7729) 

P.O.  Box  6303  Annex 
Anchorage  AX  99502 
(344-1011) 

P,0.  Box  470 
Belfast  ME  04915 
(207-338-4088) 

P.O.  Box  374 

Canendaigua  NY  T4424 
(315-394-4240) 

P.O.  Box  251 

Chtllicothe  OH  45601 
(614-775-6523) 
PC  Box  b 
Douglas  AZ  85607 
(602-364-2133) 

9900  West  State  Road  84 
P.O.  Box  22836 
Fort  Lauderdale  FL  33375 
(305^583  2511) 

P.O.  Box  1 588 

Grand  Island  NE  68801 
(308-3824296) 

P.O.  Box  632 
Kingsville  TX  78363 
(512  592-2531) 

P.O.  Box  40 
Laurel  MD  20810 
(301-725-3474) 

P.O,  Box  31 1 
Livermore  CA  94550 
(415-447-3614) 

3222  McLeod  Road 
P.O.  Box  339 

Bellingham  WA  98225 

{Marietta  Monitoring  Station) 

'206-734-4196) 

3600  HiranvLithia  Spring  Road,  S.W, 

P.O.  Box  85 

Powder  Springs  GA  30073 

(404-943-5420) 

P.O.  Box  1ST 

Sabana  Seca  Puerto  Rico  00749 

(809-784-3772) 

P.O.  Box  5126 
Santa  Ana  CA  92704 
(714-545-1333) 

P.O.Box  191 
Spokane  WA  99210 
(509-244-2141) 

P.O.  Sox  1035 
Waipahu  HI  96797 
(808  677  3954) 


station  in  the  World  Radio  TV  Hand- 
book, which  will  also  give  you  the 
name  of  the  Chief  Engineer.  If  you 
can't  get  your  hands  on  one,  drop  me 
3  line. 

If  a  local   broadcast   station  is  the 

offender  (harmonics)  you  might  try  a 
phone  call  to  the  Chief  Engineer. 
He'll  probably  be  happy  to  have  the 
problem  brought  to  his  attention  be- 
fore the  FCC  finds  out. 

Next,  you  might  try  the  FCC.  I 
have  found  them  to  be  of  little  use, 
but  you  may  find  them  helpful.  One 
thing  they  are  good  for  (if  you  can 
afford  to  call  the  nearest  monitoring 
station)  is  to  get  bearings  on  an 
unknown  station.  Unfortunately,  alt 
monitoring  stations  are  not  operated 
24  hours,  and  it  may  be  difficult  to 
get  a  bearing.  For  example,  I  called 
the  Allegan,  Michigan  station  to  check 
on  a  commercial  RTTY  station  on  40 
meters.  Since  they  only  had  a  station 
in  Florida  to  work  with,  the  best  they 
could  tell  me  was  "the  West  Coast  of 
South  America." 

The  FCC  will  take  your  name  and 
call,  and  supposedly  you  will  get  some 
word  from  them  as  to  what  happened 
to  your  report.  However,  I  have  never 
received  any  such  confirmation.  I  get 
the  impression  from  talking  to  them 
that  they  are  busy  with  other  things, 
and  really  don't  want  to  spend  the 
time. 

And  finally,  you  can  complain  to 
Intruder  Chase.  This  wilt  be  described 

in  full  next  month,  but  basically  it 
will  serve  to  validate  reports  to  make 
sure  that  the  offending  stations  get 
accurate  information  and  to  coordi- 
nate reports.  This  way  a  station  can't 
send  out  letters  to  a  hundred  people 
telling  each  of  them  that  theirs  was 
the  only  complaint  received.  The  fn 
truder  Net  will  keep  interested  people 
more  closely  informed  on  the  current 
situation,  as  well  as  being  invaluable 
for  direction  finding.  I  should  have  a 
couple  of  direction  finding  antennas 
for  40  ready  soon,  either  to  be  de- 
scribed in  a  future  column  or  for  an 
sase. 

By  the  way,  the  Chase  is  not  trying 
to  compete  with  the  ARRL  Intruder 
Watch,  but  is  in  addition  to  it.  All 
reports  to  the  Chase  will  also  be 
forwarded  to  the  ARRL.  We  will  try 
every  avenue  available  to  get  rid  of  the 
intruders. 

There  is  no  intruder  listing  for  this 
month,  since  I  haven't  gotten  any 
reports  yet  due  to  the  publishing 
delay. 

.  .  .  WB8DBN 


AMSAT 


NEWS 


Michael  Frye  WB8LBP 
640  DeauvHie  Dr 

Dayton  OH  45429 


AMSAT's  activity  during  the  next 
year  is  expected  to  continue  to  focus 
on  the  OSCAR  6  and  A-O-B  satellite 
projects.  Concurrently  with  this  ac- 
tivity, AMSAT  is  exploring  with 
Wl A- Project  Australia  and  AMSAT 
Deutschland;  the  development  of  new 
satellites  to  be  constructed  by  these 
groups  using  some  AMSAT— provided 
A—  O—  B  series  hardware,  along  with 
new  communications  repeater  experi- 
ments. Additional  projects  showing 
excellent  progress  toward  use  for  fu- 
ture OSCAR  satellites  include  a  new 
spaceframe  structure  under  develop- 
ment by  Project  OSCAR,  Inc.  in 
California  and  144— to— 435  MHz  lin- 
ear repeaters  under  development  in 
Germany  and  Australia. 

In  addition  to  technical  activities, 
efforts  are  now  underway  to  secure 
funds  for  continued  AMSAT  projects, 
directed  not  only  toward  providing 
more  advanced  satellites  of  the 
A— O— B  series,  but  also  toward  devel- 
oping the  capability  of  building 
AMSAT  payloads  for  synchronous, 
near  —  synchronous  and 
synchronous— transfer  orbits*  The 
funding  for  these  projects,  estimated 
to  require  nearly  3100,000  per  year, 
will  necessitate  additional  donations 
from  individuals,  as  well  as  contri- 
butions from  other  sources.  Assisting 
with  the  fund—raising  efforts  will  be 
the  new  ARRL  Foundation  recently 
established  by  the  League  Board  of 
Directors.  One  of  the  first  functions 
of  this  foundation  will  be  to  obtain 
donations  for  satellite  projects.  The 
directions  future  projects  take  and  the 
overall  level  of  AMSAT  activity  in  the 
years  to  come  will  be  dependent  upon 
the  degree  of  financial  support  ob- 
tained by  the  new  foundation. 

W  B  1 D  NW  has  reported  seeing 
OSCAR  6  thru  his  telescope  at  the 
Talcott  Mountain  Science  Center. 
After  many  nights  of  careful  planning 
along  with  the  waiting  for  a  clear  sky 
Bob  was  rewarded  with  the  satellite 
showing  up  as  a  small  white  dot  in  the 
sky.  It's  no  small  task  to  find  a  tiny 
object  less  than  a  yard  across  at  a 
distance  of  115  miles.  But  as  Bob  has 
proved  it  is  far  from  impossible. 

The  ARRL  is  sponsoring  a  10  meter 
contest  on  December  15  and   16  to 


DECEMBER  1973 


11 


^m 


promote  activity  on  this  band.  The 
news  however  is  that  they  are  allowing 
satellite  contacts  to  count  as  points  in 
the  contest.  Complete  details  are  avaih 
able  from  the  League. 

OSCAR  6  celebrated  it's  first  birth- 
day October  15.  For  the  occassion 
AM  SAT  drafted  a  taped  message 
which  was  broadcast  over  the  satellite 
during  the  referance  orbits  for  a  week. 
The  fact  that  Oscar  6  survived  for  this 
length  of  time  is  a  boost  to  AMSAT 
and  all  the  people  who  have  helped 
around  the  world.  It  is  also  an  indica- 
tor that  future  satellite's  of  an  irrv 
proved  design  can  last  for  much  longer 
periods  of  time. 

December  Orbital  Information 


REV 

DATE 

TIME  Z 

LON 

51S1 

1 

0046.6 

59.3 

5164 

2 

0141.6 

73.0 

5176 

3 

0041.5 

58.0 

5189 

4 

0136.4 

71.8 

5201 

5 

0036.4 

56.7 

5214 

8 

0131.3 

70.5 

5226 

7 

0031.2 

55.5 

5239 

8 

0126.2 

6S.2 

5251 

g 

0026.1 

54.2 

5264 

10 

0121.0 

67.9 

5276 

11 

0020.9 

52.9 

5289 

12 

0115.9 

66.6 

5301 

13 

0015.B 

51.6 

5314 

14 

0110.7 

65.3 

5326 

15 

0010.7 

50.3 

5339 

16 

0105.6 

64.1 

5351 

17 

0005.5 

49.0 

5364 

18 

0100.5 

62.8 

5376 

19 

0000.4 

47.8 

53S9 

20 

0055.3 

61.5 

5402 

21 

0150.3 

75.2 

5414 

22 

0050.2 

60.2 

5427 

23 

0145.1 

73.9 

tf^  J  3 

24 

0045.1 

58.9 

5452 

25 

0140.0 

72.7 

5464 

26 

0039.9 

57.7 

5477 

27 

0134.9 

71.4 

548S 

28 

0034.8 

56.4 

5502 

29 

0129.7 

70.1 

5514 

30 

0029.7 

55.1 

5527 

31 

0124.6 

68.8 

Summary  of  AMSAT-OSCAR^B 
Spacecraft  System 

AMSAT  Deutschland  Repeater  (de- 
signed by  Karl  Meinzer,  DJ42CK 
Input  frequency  passband  between 
432-125  and  432.175  MHz.  Out  fre- 
quency passband  between  145,975 
and  145.925  MHz,  Power  output 
(high  power  model  is  14W  PEP, 
Downlink  passband  is  inverted  from 
uplink  passband.  Repeater  is  45%  ef- 
ficient using  envelope  elimination  and 

restoration  technique.  Linear  Oper- 
ation— SSB  and  CW  are  preferred 
modes.  Repeater  is  comma ndabie  to 
either  3.75  or  14W  PEP  output.  Tele- 
metry  beacon  at  145.980  MHz  (200 
mW). 

AMSAT  Two— to— Ten  Meter  Re- 
peater (designed  by  Perry  Klein, 
K3JTE)  Input  freq.  passband  between 
145.85  and  145.9  MHz.  Output  freq. 


passband  between  29.40  and  29.50 
MHz.  Power  output  is  2W  PEP.  Down- 
link passband  is  not  inverted  from 
uplink  passband.  Linear  Operation  — 
SSB  and  CW  are  preferred  modes, 
Telemetry  beacon  at  29,50  MHz  (not 
same  as  OSCAR  6). 

Morse  Code  Tef erne  try  Encoder 
(designed  by  John  Goode.  W5CAY), 
24  analog  input  channels.  Converts 
each  analog  value  into  a  two— digit 
Morse  code  number  or  "word/'  A 
third  digit  precedes  the  telemetry 
value  and  gives  the  line  number  in 
which  the  word  is  located.  Format  is 
arranged  4  words  per  line,  six  lines  per 
telemetry  frame.  Morse  code  rate  ts 
commandable  to  10  wpm  or  20  wpm. 

Teletype  Telemetry  Encoder  (de- 
veloped by  Peter  Hammer,  VK3ZPI 
and  Edwin  Schoell,  VK3BDS).  60 
analog  input  channels.  Converts  each 
analog  channel  to  a  three-digit  num- 
ber transmitted  in  Baudot  code.  Each 
three— digit  value  is  preceded  by  its 
channel  number,  making  a  five-digit 
telemetry  word.  The  data  is  arranged 
10  words  per  line  by  six  links  per 
telemetry  frame.  Two  lones  of  status 
information  follow  the  analog  matrix 
and  give  the  spacecraft  time  (i.e.,  time 
in  "counts"  from  launch,  1  count  = 
96  minutes).  Output  keys  435,1  MHz 
beacon  in  FSK:  850  Hz  shift;  45.5 
Baud:  (reversed  from  U.S.  standard). 
Also  keys  145.98  and  29.50  MHz 
beacons  as  AFSK,  on  com- 
mand. 

435. 1  MHz  Beacon  Transmitter  (de- 
veloped by  Larry  Kaysert  VE3QB  and 
Bob  Pepper,  VE2AO).  Beacon  output 
freq,  is  435.10  MHz.  Power  output  is 
0.4W  at  an  efficiency  of  45%,  Beacon 
is  FSK  modulated  850-Hz  shift 

2304  MHz  Small  Beacon  Trans- 
mitter (developed  by  San  Bemadino 
Microwave  Society).  0.1W  at  2304 
MHz,  Turned  on  by  command  only 
for  30  min.  periods.  CW  keyed  —  HI 
followed  by  30  sec.  carrier.  Also 
keyed  with  Morse  Code  telemetry  on 
command. 

Codestore  —  Message 
store-and-forward  system  (built  by 
John  Goode,  W5CA  Y).  896  bit  mem- 
ory capacity  using  COS/MOS  shift 
register  memory.  Loaded  via  com- 
mand link.  Output  code  speed  is  13 
wpm. 

Experiment  Control  Logic  (de- 
signed by  Jan  King,  W3GEY).  Selects 
the  spacecraft  operating  modes.  Pro- 
tects satellite  against  excessive  battery 
drain  by  reducing  repeater  output 
power  or  by  shutting  it  off  com- 
pletely. 

Input  Solar  Power  /Battery  Charge 
Regulator  (developed  by  Karl 
Meinzer,  DJ4ZC  and  Werner  Haas, 
DJ5KQ).  Converts  6,4V  at  arrays  to 
14V  to  charge  battery  or  to  supply 
the    spacecraft    experiments.    Senses 


overcharge  of  battery  and  reduces 
charging  current.  Senses  failure  of 
either  of  the  two  redundant  regulators 
and  switches  to  the  opposite  regulator 
automatically. 

AMSAT-OSCAR-B  Spacecraft 

A-O-B  (to  be  known  as  OSCAR  7 
after  launch)  is  an  international  effort 
now  involving  four  nations.  The 
A— 0— B  systems  developed  in  each 
country  are  as  follows: 

Germany:  AMSAT  Deutschland  Re- 
peater, Spacecraft  Structure,  Battery 
Charge  Regulator,  28V  Power  Regula- 
tor, Antenna  System  —  DJ4ZC, 
DJ5KQ. 

Australia:  Two  Redundant  Com- 
mand Decoders,  Teletype  Telemetry 
Encoder- VK3ZPL 

Canada:  435.1  MHz  Beacon  Trans- 
mitter -  VE3QB  and  VE2AO. 

United  States:  2M/T0M  Repeater, 
Morse  Code  Telemetry  Encoder,  Ex- 
periment Control  Logic,  Instrumenta- 
tion Switching  Regulator,  Solar 
Panels,  Battery  -  K3JTE,  W3GEY, 
WA4DGU,  W3DTN,  Marie  Marr, 
Codestore  -  W5CAY,  5  Band  Beacon 
Transmitter    -    K6HIJ. 

...  WB8LBP 


HAM 


HELP 


This  column  is  for  those  needing 
help  in  obtaining  their  amateur  radio 
license. 

If  you  are  interested,  send  73  your 
name,  address  and  phone  number. 
Don't  be  bashful  —  remember,  it's 
always  easier  when  you  have  someone 
to  give  you  that  added  bit  of  con- 
fidence, 

73  would  appreciate  amateurs  and 
clubs  looking  this  list  over  and  helping 
whoever  they  can.  Do  you  remember 
when  you  needed  help? 

Robert  White 

365  Clinton  River  Dr. 

Ml  Clemens  MI  48043 

468*4746 

Allan  Kowal 
21-2800  Allwood  St. 
Abbotsford  B.C.  Canada 
859  7928 

John  Diecker 
9968  Northamton  Dr. 
St  Louis  MO  63137 
314868-2905 

James  Taylor 
1516  Sheley  Rd, 
Independence  MO  64052 
816  2524844 


12 


73  MAGAZINE 


GO 
Joe  Kasser 

1701  East-West  Highway,  Apt.  205 

Silver  Spring  MD  209 10 

A  recent  column  briefly  mentioned 
the  value  of  mint  or  unused  U.S. 
postage  stamps  as  gifts  for  foreign 
hams  when  travelling  overseas*  They 
are  useful  to  those  avid  dx-ers  who 
wish  to  send  QSL  cards  direct  to 
stateside  QSL  managers  so  as  to  re- 
ceive the  QSL's  by  return  mail  (hope- 
fully). 

Well  the  same  thing  works  in  re- 
verse. If,  for  example  a  stateside  sta- 
tion works  a  station  in  Andorra  with  a 
QSL  manager  In  Germany,  a  direct 
mail  QSL  would  require  three  IRC's, 
costing  about  60d  to  be  used  to 
purchase  postage  stamps  costing  about 
2CW  to  pay  for  the  return  postage. 
Wouldn't  it  be  better  to  get  German 
stamps  at  (anything  up  to  twice)  what 
they  cost  at  the  German  Post  Office, 
and  use  those  to  prepay  that  QSL?  If 
the  stateside  station  sends  many  cards 
overseas  he  may  even  be  able  to  save 
enough  money  to  buy  a  new  linear  if 
he  gets  stamps  instead  of  IRC's.  Of 
course  with  the  linear  he  will  work 
more  stations  and  so  send  out  more 
cards  and  save  even  more  money.  Or 
will  he?  Think  about  it. 

Where  do  you  the  stateside  ham  get 
foreign  stamps?  You  probably  don't 
have  to  look  further  than  your  local 
radio  club.  Surely  at  least  one  of  the 
members  is  a  stamp  collector  He  will 
know  where  to  obtain  them.  In  case 
you  can't  locate  a  philatelist  let  me 
suggest  one  or  two  ways. 

The  cheapest  way  of  obtaining  un- 
used (mint)  foreign  stamps  is  to  get 
them  at  the  local  Post  Office  (over- 
seas). Living  in  a  different  country 
that  is  obviously  impossible,  but  the 
words  "mail  order"  should  be  very 
familiar  to  the  American^ear.  Practi 
cally  every  post  office  in  the  world 
runs  a  philatelic  bureau  to  sell  unused 
postage  stamps  to  collectors  all  over 
the  world.  They  will  usually  be  only 
too  pleased  to  put  you  on  their 
mailing  lists  and  send  you  periodic 
announcements  of  their  new  issues. 
With  a  small  handling  charge  you  can 
order  any  current  stamp  at  face  vafue. 
How  do  you  find  out  what  values  of 
stamps  you  need?  Simple,  just  ask  in 
the  QSO.  Ask  "what  does  it  cost  in 
your  money  to  send  an  airmail  letter 
to  my  country?"  In  case  you  forgot 
the  foreign  currency  equivalent  of  25tf 
will  usually  be  more  than  enough.  Just 
drop  a  line  to  the  Post  Office  Phil- 


atelic Bureau  of  his  country  (that 
should  be  enough  address  in  most 
cases  —  after  all  the  Post  Office 
delivers  the  letters  and  they  should 
know  the  address  of  one  of  their  own 
departments)  asking  for  details  of 
their  bureau  and  of  their  current 
issues.  When  you  get  the  details,  order 
any  stamp  or  stamps  that  will  make 
up  the  value  you  need.  It  will  be 
better  if  you  can  arrange  to  order  in 
bulk  getting  stamps  for  the  other 
chaps  at  the  radio  club  at  the  same 
time,  This  splits  the  small  handling 
charge  into  a  negligible  sum.  You  can 
even  con  them  into  getting  the  stamps 
to  put  into  their  own  albums,  or  to 
give  to  their  nephews  as  a  present  or 
two,  if  they  don't  need  them  (or  think 
they  don't  need  them). 

If  you  don't  want  to  try  the  bureau 
route,  and  what  direct  QSLer  does?  to 
obtain  postage  stamps  the  alternative 
is  to  obtain  them  from  a  stamp  dealer. 
Many  stamp  dealers  put  out  weekly  or 
monthly  "new  issue  sheets"  listing 
new  world  issues  that  they  have  for 
sale.  Advertisements  for  these  fists  can 
be  found  in  stamp  collecting  maga- 
zines available  at  your  local  magazine 
or  book  store  or  even  in  your  local 
library.  These  dealers  charge  anything 
from  10%  to  100%  above  face  value 
for  their  services.  This  is  more  expen- 
sive  than  the  bureau  route,  but  what 
isn't  Just  read  the  classified  ads  in  the 
magazines,  choose  a  dealer  or  two  and 
ask  to  be  put  on  the  mailing  list.  If 
you  order  small  amounts  from  time  to 
time  you  should  be  able  to  stay  on  the 
list* 

Another  method  of  obtaining 
stamps  is  to  have  friends  and/or  rela- 
tives in  overseas  places  and  to  get  the 
stamps  from  them.  If  you  can  come  to 
an  arrangement  with  a  member  of  the 
flight  crew  of  an  international  airline, 
so  much  the  better  because  you  can 
save  on  the  outward  postage  as  well  if 
he  or  she  will  mail  your  letter  En  the 
foreign  country. 


If  anyone  reading  this  is  a  phil- 
atelist, I  have  a  small  collection  too. 
Perhaps  you  may  be  interested  in 
trading  one  or  two.  If  you  have  any 
information  that  a  travelling  ham 
might  find  useful  let  me  know  please, 
and  I'll  pass  it  on  in  this  column. 

G3ZCZ/W3 


The    Horn  burglar 

STRIKES  AGAIN  I 

Stolen  10/8-Sonar  F  R-2528  scanner 
No.  21-4250.  Standard  src-851-SH  2 
meter  xcvr  No.  9725.  Standard 
src-707C  450MHz  xcvr  No.  2833.  TPL 
PA-6-1DE  450Mhz  amplifier  No. 
1092.  RP  MEA-22  synthesizer  No, 
212,  and  two  LARSEN  mobile  an- 
tennas. Contact  Mr;  Ed  Doherty,  25 
Crescent  Dr.,  Beacon  NY  12508, 

Standard  Model  SRC- 146  A  FM 
transceiver  in  leather  case,  serial 
208070,  was-  stolen  from  aircraft  at 
Los  Angeles  International  Airport  on 
October  5,  1973.  Xtals  installed  — 
four  amateur  and  one  national  wea- 
ther service.  Contact:  Lt  W,L  Robin- 
son, SLPD,  Chief  Security,  Salt  Lake 
City  International*  Phone 
{801)328-7652  or  PO  AMF  Box 
22084,  Salt  Lake  City  UT  841 22. 

A  Swan  270  M-252616  along  with 
its  automobile  was  stolen  in  front  of 
the  Holliday  Inn  in  Sumpter  SC  on 
September  15,  1973,  As  of  now  it  has 


QTH 
CHANGE? 

To  be  absolutely 
sure  that  73  will 
follow  you  to  your 
new  QTH,  try  to 
notify  our  Subscrip- 
tion Department  at 
least  8  weeks  in 
advance  of  your 
move.  Please  include 
your  old  address 
and  call  as  it  appears 
on  your  current 
mailing  label  —  or 
better  yet,  send  the 
label  itself. 


OLD  A  Oft  for  mailing  label} 


NAME 


CALL 


ADDRESS 


CITY 


STATE 


ZIP 


NEWADR 


NAME. 


CALL 


ADDRESS 


CITY. 


STATE 


ZIP. 


DECEMBER  1973 


13 


not  been  recovered.  Contact  Harold  L. 
Manning  W4NTB,  2107  Princess  Place 
Drive,  Wilmington  NC  28401. 

LIST  FROM  PAST  ISSUES 

AF68  Wo.  10888  K5LKL  1/73 

PMR8N0.  10916 

M 1070  pwr  supply 

Trio  TR2200  No.  241 969         WA2ZBV  1/73 

Clegg  22m  No.  1900  578  WlDHP  2/73 

Standird  826M.No.  11 2007     WABPCG  3/73 


FM27B  No.  27013-1141 

W2LNI 

4/73 

FM-144-lOLNo  F459 

WA6WOA 

4/73 

NPC  107  m  pwr  uipply 

2,  5AJ-IPL  Onafi  G«n+, 

No.  327885 

R4BNo.  11578G 

WA8GVK 

6/73 

T4X8  No.  17801  G 

W4  wattmeter  No.  3390 

Swan  250  No.  F 154806 

Swan  ac  pwr,  sup.  No.  0653556 

HR2  No  04-C2879 

W6GSR 

6/73 

SB  34  No   211828 

STD826  Mo.  011268 

WA2FSD 

6/73 

HT220  No.  GJ7327 

State  Univ. 

6/73 

of  NY  (Albany! 

Yaesu  FT  101 

W4GF 

7/73 

No  82G12279/CW 

HR-2  No.  0302030 

Clegg  27B  No,  72013-1068 

W3BXL 

7/73 

Std.  826MA  No,  208078 

wB2oew 

7/73 

Drake  ML  2    Mo.  10582 

W3MSN 

8/73 

Tektronics  453  Scope 

WB2FZU 

8/73 

VOXTEST 


Tm.' 
4*SJ 


WB2CHW 


Larry  Green  berg  of  Roslyn  Ests, 
NY  wins  the  QSL  contest  this  month! 
Show  your  card  to  the  world  and  win 
a  free  subscription  to  73.  Send  your 
entry  to  QSL  Contest,  73  Magazine, 
Peterborough  NH  03458. 


SOLDER  GUN  TIPS 

Many  technicians,  experimenters 
and  electronic  assembly  workers  have 
given  up  the  use  of  soldering  guns 
when  working  on  solid  state  circuits 
because  of  the  danger  of  causing 
damage  to  delicate  components.  Most 
now  use  low- wattage  soldering  irons 
and  solder  suckers.  The  development 
of  a  new  solder  gun  element  by 
Gunmaster  Universal  Industries  which 
accommodates  interchangeable  solder 
ing  tips  and  solder  removers  has  re- 


stored the  solder  gun  as  a  practical 
tool  tor  working  on  printed  circuit 
boards. 

The  element,  which  will  fit  most  of 
the  popular  solder  guns,  is  perma- 
nently installed.  For  soldering,  plastic 
sealing,  marking,  burning,  etc.,  a  tip, 
known  as  the  SLUG,  is  screwed  into 
the  front  end  of  the  element  For 
removing  solder  by  capillary  action, 
the  hollow  bore  desoldenng  tip, 
known  as  the  DUM-DUM,  is  screwed 
in  place.  And  for  removing  heavy 
solder  deposits,  a  solder  sucker  may 
be  attached  to  the  back  end  of  the 
DUMDUM. 

For  more  information  on  the  ver- 
satile attachments,  contact  Gunmaster 
Universal  Industries,  PO  Box  743, 
Kings  Park  NY  J 1754. 

DIGITAL  VOLTMETER 


Now  a  low  priced  laboratory 
quality  digital  voltmeter  is  available 
from  MITS,  Inc.  Model  DVM  1600 
measures  alternating  and  direct  cur- 
rent in  five  ranges  from  .1  ma  to  1 
amp.  AC  and  DC  voltage  is  measured 
in  four  ranges  from  one  volt  to  1000 
volts.  Measurement  of  ohms  is  in  six 
ranges  from  100  ohms  to  10 
megohms. 

The  resolution  in  low  ranges  for 
voltage  is  10  mv;  for  current,  10  ma; 
and  for  resistance,  1  of  m.  DC  voltage 
accuracy  is  ±.  .5%.  All  other  measure- 
ments are  accurate  to  ±  1%.  Input 
impedance  for  DC  voltage  measure- 
ment is  10  megohms;  for  AC  voltage, 
1  megohm. 

The  DVM  1600  also  features  auto 
polarity  which  automatically  displays 


polarity  and  magnitude  without  probe 
reversal.  Other  features  include  a  reg- 
ulated power  supply  and  100%  over- 
range  capability  on  all  ranges.  Power 
requirements  are  115/230  VAC, 
50/60  Hz,  20  watts.  The  two  plus 
digits  are  of  bright,  easy  to  read 
Sperry  gas  discharge.  The  attractive 
brushed  aluminum  case  has  an  over- 
hang for  better  visibility. 

The  MITS  DVM  1600  is  available  in 
an  easy  to  assembly  kit  or  factory 
assembled.  Warranty  on  the  assembled 
model  is  one  year  on  parts  and  labor. 
Kit  warranty  is  ninety  days  on  parts. 
The  price  is  $89.95  for  the  kit  and 
$129.95  assembled. 

Contact  MITS  Inc.,  6328,  Linn 
Avenue,  NE,  Albuquerque  NM  87108, 
(505)265-7553. 

100  WATT  PEP 
TRANSISTOR 


A  new  100  watt  PEP  and  CW  RF 
power  transistor  is  now  available  from 
TRW  Semiconductors,  an  Electronic 
Components  Division  of  TRW  Inc., 
Lawndale,  California.  The  devices,  de- 
signated PT5788  for  the  stud  moun- 
ted version,  and  PT6665A  for  flange 
mounted,  operate  at  100  watts  both 
peak  envelope  power  and  CW,  which 
is  believed  to  be  a  first  in  the  high 
power  range. 

The  devices  are  intended  primarily 
for  single  sideband  HF  radio  applica- 
tions and  should  find  many  used  in 
amateur  radio. 

The  PT5788  and  PT6665A  feature 
intermodulation  distortion  of  only 
32dB  and  a  minimum  power  gain  of 
14dB. 

The  rugged  units  incorporate  ther 
mally  isolated  celts  and  individually 
ballasted  emitter  sites  for  improved 
reliability  and  stable  operation. 

Up  to  200  watts  of  power  are 
available  in  an  amplifier  by  combining 
two  of  the  devices.  Up  to  320  watts 
and  a  power  gain  of  17dB  can  be 
achieved  with  4  devices.  TRW  con- 
siders the  4-device  unit  a  basic  build- 
ing block.  Summing  circuitry  and 
mechanical  links  are  widely  available 
to  make  it  easy  to  combine  four  of 


14 


73  MAGAZINE 


oons    don  f        ver 


I   insist    that  you  print    ev 


A  REPEATER  STORY 

Licensing  our  simple,  manual,  lo- 
cally controled  repeater  turned  into 
one  of  the  most  mixed-up  and  con- 
fused messes  that  could  be  imagined; 

Drafted  into  applying  for  the  re- 
peater license  was  George  Silvius 
W3LA,  a  retired  army  sgt.  .  .Dave  But- 
ler WA3SKJ,  a  communications  en- 
gineer .  .  and  Al  Brown  WA3FYZ,  a 


these  building  blocks  to  provide  a 
IkW  amplifier. 

Price  for  the  PT5788  and  PT6665A 
in  TOO  level  quantities  is  $38.50.  The 
units  are  available  from  authorized 
TRW  distributors. 

For  further  information  contact 
Sales  Manager,  TRW  Semiconductors, 
an  Electronic  Components  Division  of 
TRW  inc.,  14520  Avaiation  Blvd., 
Lawndale  CA  90260;  phone 
(2131679-4561. 


ANTENNA  SWITCH 


The  Heath  HD-1234  is  designed  to 
switch  one  RF  source  to  any  one  of 
several  antennas  or  RF  loads  while 
grounding  the  unused  outputs,  Two 
Heath  kit  Coaxial  Switches  can  be  used 
to  switch  up  to  four  antennas/loads  to 
four  different  units  (transceivers, 
transmitters,  receivers,  etc  J, 

Standing  wave  ratio  to  250  MHz  is 
LT :  1  maximum-  Power  capability  is 
1000  W  (2000  W  PEP).  A  bracket  is 
provided  for  mounting  on  equipment 
cabinets,  desk  or  wall. 

Price  of  the  HD-1234  Coaxial 
Switch  is  S9.95  mail  order.  For  more 
information,  contact  Heath  Company, 
Benton  Harbor  Mi  49022;  phone 
(616)983-3961. 


broadcast  engineer.  These  diversified 
talents  combined  with  the  unclear  and 
often  contradictory  instruction  of  the 
FCC,  led  to  almost  complete  confus- 
ion these  last  few  months. 

Our  story  starts  with  the  applica- 
tion. Since  there  are  no  repeater  ap- 
plications as  such  yet,  modification 
had  to  be  made  to  an  FCC  form 
61  OB,  which  is  the  application  for  a 
secondary  station. 

Next  we  had  to  determine  the 
antenna  gain,  vertical  and  horizontal 
radiation  patterns.  By  utilizing  that 
acquired  data,  the  effective  radiated 
power  was  to  be  found,  since  the 
transmitter  output  power,  and  coaxial 
losses  were  readily  available.  (HA) 

Finding  the  transmitter  antenna 
height  above  average  terrain  was  fun 
also.  No  less  than  forty  points  had  to 
be  plotted  on  a  map  and  the  average 
of  these  determined  the  average  height 
of  the  terrain  above  sea  level.  This 
figure  compared  with  the  antenna 
height  above  sea  level,  gave  our  an- 
tenna height  above  average  terrain 
(HAAA!)  In  our  particular  case  it  was 
minus  six  and  one-fourth  feet 

So  now,  all  the  data  had  been 
procured  and  was  ready  for  filing  with 
the  FCC,  The  form  61 0B  had  been 
modified,  signed,  dated,  and  all  sec- 
tions  filled  out.  George  even  made  a 
special  trip  to  the  library  to  make  a 
xerox  copy  of  his  license  to  submit.  A 
copy  of  the  club  constitution  was 
readied.  Five  pages  of  algebra,  arith- 
metic, logarithmic,  and  decibel  con- 
versions and  graphs  on  antenna  gain  as 
3.75  dB  and  even  by  our  trial  and 
error,  hit  and  miss,  flim-flam  methods, 
we  barely  made  3  dB  at  times.  EH! 

By  using  a  figure  of  around  3  dB, 
the  ERP  worked  out  to  about  90w 
and  George  hand  carried  this  entire 
package  to  the  FCC  in  Gettysburg. 
They  looked  through  it.  .  .said  ft 
seemed  OK  and  since  he  was  known 
so  well  up  there  that  there  was  really 
no  need  for  him  to  attach  a  copy  of 
his  license.  So  he  didn't. 

Well,  after  several  weeks  of  hopeful 
anticipation,  the  repeater  application 
was  kicked  back.  It  seems  that  al- 
though George  was  known  in  Gettys- 
burg, he  wasn't  very  popular  in  Wash- 
ington, Back  to  the  library.  Applica- 
tion  was  refiled  plus  a  photocopy  of 
George's  license  minus  the  club  consti- 
tution which  the  FCC  said  was  super- 
fluous information* 

Well,  once  again,  after  several  weeks 
of  hopeful  anticipation,  a  phone  call 
from  the  FCC  revealed  that  tests  were 
run  on  that  type  of  antenna  and  the 
true  gain  was  found  to  be  2.8  dB.  This 


meant  recalculation  of  ERP,  The  next 
morning  the  FCC  called  again  and  the 
gain  was  down  to  2.5  dB  and  the 
antenna  was  accepted  on  the  FCC 
approved  list.  This  meant  recalcula- 
tion again  of  the  E  RP  and  the  deletion 
of  five  pages  of  information  on  an- 
tenna gain  figures  and  patterns.  By 
late  afternoon  the  FCC  dropped  that 
figure  to  2.0  dB.  Seems  strange  that 
we  had  the  only  application  with  that 
type  of  antenna  that  did  not  say  3.75 
dB.  Oh  well,  we  caluclated  for  2.0  dB 
and  resubmitted.  The  application  was 
kicked  back  because  there  was  no 
copy  included  of  the  W3CWC  lic- 
ense. .  .back  to  the  library. 

Three  weeks  after  that  we  received 
the  license  and  call  sign  WR3ABT, 
club  repeater  station.  Licensed  to  An- 
tietam  Radio  Association,  George  E. 
Silvius,  Trustee. 

Al  Brown  WA3FTZ 
Dave  Butter  WA3SKJ 
George  SHvius  W3LA 


WHERE  OH  WHERE  QSL? 

The  Radio  Society  of  Okinawa  has 
a  substantial  amount  of  QSL  cards  of 
both  KA6  &  KR6  calls.  The  hams  who 
operated  these  stations  have  since  left 
the  island.  Any  former  KR6  or  KA6 
holder  who  wants  his  cards  contact 
the  Radio  Society  of  Okinawa,  Box 
465,  Fort  Buckner,  APO  San  Fran- 
cisco CA  96331.  There  are  many  call 
signs  too  numerous  to  list. 

QSL  Information:  All  KA6  QSL 
Cards  should  be  sent  to  the  Radio 
Society  of  Okinawa  and  not  FEARL. 
The  RSO  operates  and  maintains  its 
own  QSL  Bureau  * 

Due  to  the  fact  that  the  majority  of 
our  members  and  former  members  are 
in  the  Armed  Forces  it  is  impossible 
for  us  to  reach  them  due  to  rotation 
and  address  changes.  Your  magazine 
could  help  enormously  by  publishing 
this  notice. 

Anne  VI.  Szezesniak 

QSL  &  Awards  M imager 

Radio  Society  of  Okinawa^, 

Box  465  Fort  Buckner 

APO  San  Francisco  CA  9633 1 


VHF  ENGINEERING 

I'm  not  one  for  writing  letters, 
except  usually  to  complain  about 
something  great  and  evil  to  me,  but 
the  quality,  courtsy;  and  service  of 
one  of  your  advertisers  has  over- 
whelmed me,  I  purchased  a  two  meter 
FM  transmitter  kit  fro,  VHF  Engineer- 
ing  shortly  after  they  began  advertis- 
ing. After  I  disregarded  their  excellent 
directions  and  incorrectly  constructed 
the  unit,  I  mailed  it  to  them.  Five,  yes 
only  five  days  latter  I  received  my 
unit  back,  repaired,  no  charge!  (Try 
that  with  Heath.)  The  unit  gets  fantas- 
tic reports  on  the  air.  Then  I  pur* 
chased  the  15  watt  amp,  and  it  was  on 
the  air  in  less  than  an  hour  after  the 
postman  arrived  with  equally  excel- 
lent   results.    From    time  to  time,  as 


DECEMBER  1973 


15 


M 


they  continue  to  upgrade  their  pro 
ducts,  theyF  unsolicited  by  me,  mail 
information  on  these  upgrading  pro- 
cedures to  me.  .  .at  their  prices,  with 
their  sen/ice,  and  with  their  high 
quality,  what  more  could  one  ask.  We 
need  more  VHF  Engineering  Corps  in 
all  areas.  I  wonder  if  they  have  con- 
sidered the  manufacture  of  auto- 
mobiles. .  . 

Boh  Fox  K2MDM 

Uiooklvrt  NY 


FCC  COMMENTS 

Just  sent  in  comments  on  an  FCC 
docket  for  the  first  time  in  my  life, 
and  I  am  going  to  blame  you  and  the 
rest  of  the  73  staff  for  the  cash  I  was 
forced  to  put  out  (not  to  mention  the 
lost  operating  time).  Had  it  not  been 
for  your  prodding  to  make  the  ama- 
teur voice  known,  I  would  have  sat 
nonchalantly  at  the  operating  desk 
enjoying  myself;  oblivious  to  whatever 
attrocities  the  FCC  may  be  committ- 
ing. While  I  now  feel  much  better 
about  having  put  in  my  two-cents 
worth,  it  has  shown  me  why  more 
amateurs  do  not  bother  to  make 
comments,  even  on  very  important 
matters  such  as  Docket  19759  (CB.on 
220  Ma). 

It  is  a  difficult  task  to  make  your 
self  sit  down  and  put  your  thoughts 
into  words  in  a  coherent  manner 
(Especially  for  me. .  J  am  a  news- 
paper reporter  and  have  to  do  this  sort 
of  thing  all  day,  every  day,  so  making 
myself  do  it  on  my  own  time  is  no 
simple  matter.  But  you  probably 
know  how  that  isj  Even  so,  there  is 
the  matter  of  putting  those  thoughts 
into  legal  terms,  and  paying  to  have  it 
reproduced  since  the  FCC  requires  an 
original  and  14  copies.  Of  course,  if 
you  happen  to  have  a  Xerox  machine 
in  your  hamshack,  this  cost  can  be 
reduced  considerably. 

Somehow,  though,  it  was  an  ex- 
tremely enlightening  and  rewarding 
experience.  I  would  not  hesitate  to  do 
it  again. 

Gharii*  Wrighl  WA6SLS 

Fresno  C.  \ 


MORE  PROSE 

I  have  but  one  question  to  ask  Mr, 
A*  Prose  Walker!  Which  CB  company 
does  he  own? 

ETT.R  Maj  nan! 
KwajaU'iii  MI 


LORAN 

I  thought  \  would  take  a  few 
minutes  to  write  a  quick  note  to 
correct  a  possible  mis-conception  you, 
and  many  of  your  readers,  may  have 
concerning  the  future  of  the  LORAN 
'A"  systems.  You  have  stated  several 
times  that  the  160m  band  would  soon 
be  rid  of  the  interference  of  the 
LORAN  as  it  is  being  phased  out.  May 
I  take  this  opportunity  to  tell  you  of  a 
few  recent  developments? 

This   LORAN  chain   (Central   Paci 


fie)  was  to  be  closed  by  the  end  of 
this  year  (as  were  several  others}.  All 
LORAN  "A"  was  to  be  phased  out 
over  the  next  three  years.  This  was,  I 
presume,  considered  sufficient  time 
for  the  various  organizations  to  pur- 
chase LORAN  "C"  receivers. 

However,  such  a  cry  was  raised  in 
Washington  by  the  fishermen,  the 
airlines,  and  the  military  organizations 
that  his  chain  has  been  told  it  will  be 
operating  at  least  until  the  end  of 
1974.  Very  few  of  the  LORAN  "A" 
stations  are  to  be  closed,  and  more 
than  a  few  people  feel  that  LORAN 
"A"  will  be  operational  until  1980. 

Sorry  to  have  to  put  a  damper  on 
those  of  us  who  enjoy  operating  on 
160  meters,  but  LORAN  "A"  will  be 
with  us  for  some  time. 

Rod  May  ward 
APO  San  Francisco  CA 

CARFSI  ARRL  NO 

As  a  member  of  the  largest  radio 
club  in  Canada,  the  Ottawa  Amateur 
Radio  Club,  I  can  report  that  the 
majority  of  members  don't  think  very 
highly  of  the  ARRL  or  their  Canadian 
rep  Noel  Eaton.  I  think  you'll  see 
CARF  (Canadian  Amateur  Radio 
Federation)  gradually  becoming  the 
official  voice  of  Canadian  amateurs. 

Keep  up  the  good  work  with  73 
and  our  sincere  sympathies  on  your 
repeater  regs. 

Kill  Stow 


1950  PL L 

So  infallible  is  the  synchronizing 
performance  of  Home  Television  Re- 
ceivers of  today  that  we  are  prone  to 
forget  the  frustrations  of  picture  roll- 
ing  and  tearing  of  the  early  sets.  But 
here  is  a  description  of  an  actual 
occurrence  where  an  ingenious  ap- 
proach alleviated  synch  problems,  re- 
sulting in  a  Human  Phase  Lock  Sys- 
tem. 

The  occassion  was  the  Milan  Fair 
held  in  Italy  in  the  early  1950's  when 
American  Companies  were  invited  to 
display  their  receivers.  There  being  no 
television  stations  in  that  Country  at 
that  time,  participation  meant  the 
installation  of  a  complete  station  with 
transmitter,  cameras,  pulse  generating 
equipment  as  well  as  the  receivers. 

As  was  typical  at  that  time,  Vertical 
Hold  of  the  picture  was  in  step  with 
the  power  line  frequency,  a  very 
stable  source  in  the  LISA.  Over  there 
at  that  time  it  was  not  so  stable,  being 
allowed  to  vary  as  much  as  several 
Hertz  American  pulse  generators 
would  frequently  cop  out  on  these 
wide  excursions  and  receivers  would 
begin  their  picture  rolling. 

Our  engineer,  now  WB4ITQ  was 
interested  in  preserving  the  technical 
exceltance  of  our  gear  and  took  a 
Table  Mode!  receiver  by  car  to  the 
nearby  power  station.  Here  in  glorious 
sales  technique,  he  gave  the  operating 
engineer  a  vivid  description  of  the 
wonders  of  Television,  and  offering  to 


set  one  up  in  the  power  station  for 
him  to  watch.  Of  course  an  immediate 
comraderie  was  established  and  within 
minutes  a  picture  was  received. 

"Ah  but  that  rolling  -  can  it  not  be 
stopped?  M  was  the  comment  of  the 
operator. 

"But  of  course,"  said  our  Ham 
friend.  "You  just  turn  this  big  wheel 
on  your  generator  like  this  and 
Presto!,  the  picture  stops  rolling." 

As  our  friend  left  the  power  station 
the  operator  was  smiling,  leaning  back 
in  his  big  chair  with  his  feet  on  the 
desk,  and  carefully  adjusting  the  BIG 
WHEEL  so  he  could  enjoy  the  show. 

Progress  is  important,  and  so  satis- 
fying. 

W2IK 


ALARMED  COMMENT 

Re  hams  selling  alarms:  lrve  been 
selling  alarms  for  about  half  a  year 
now,  I  haven't  made  a  killing  but  have 
been  doing  pretty  well,  I  have  a 
demonstration  model  f  use  and  if 
anyone  has  a  need  for  plans  for  it  just 
send  a  S.A.S.E.  and  I'll  see  what  I  can 
do. 

Ken  Dmsmnrr 
KENCRAFT  ARLARMS 

10601  Washington  Wa\ 
Evnvli  WA  9H2ii\ 


FM  AGAIN! 

You  probably  don't  remember  but 
last  spring  my  friend  and  I  visited 
your  offices  and  you  asked  me  if  i  was 
on  2m  FM,  The  answer  was  no,  but 
for  the  past  four  months  about  99% 
of  my  activity  has  been  on  2m  FM. 
Thanks  for  being  such  an  effective 
catalyst.  I've  never  had  so  much  fun 
with  the  hobby! 

JimKwwWA9PYH 
South  Bend  Ji\ 


STATEMENT  OF  OWNERSHIP,  MANAGEMENT 
AND  CIRCULATION  (Aet  of  August  23,  1970: 
Section  3685.  Title  39,  United  Stat*v*  Code*  1. 
TiUe  of  PubhcatJon  73  Magazine,  2,  Date  of  Filing 
2(V  September.  1973.  3*  FrcO,uencv  of  issue. 
Monthly.  4.  Location  Of  known  office  of  Publi- 
cation (Street.  City,  county*  stale  ZIP  Code)  iNol 
printers)  Pine.  Peterborough,  Hills  born.  Nil  054  T>H. 
5*  Locution  of  the  Headquarters  of  General  Bus- 
iness Offices  of  the  Publishers  (Not  printers)  Pine. 
Peterborough,  Hillsboro  NH  0.1458.  G.  Names  and 
address  of  publisher. 'du-»r,  and  managing,  editor. 
Publisher  (Name  and  address)  Wayne  Green.  Peter- 
borough NH  n:M5tt,  Editor  (Name  and  addrrSf) 
Wayne  Green,  Peterborough  NH  034 T» 8.  Manager 
Editor  (Name  .mil  address)  Homdd  Subka.  7.1, 
P«- Lerborou gh  NH  0345*1.  7.  Owner  (If  owned  by  ft 
eorp  or,itton.  its  nil  me  and  address  must  be  stated 
and  aim i  imtm-diately  thereunder  the  names  and 
addresses  of  stockholders  owning  or  holding  1 
percent  of  more  of  lata!  amount  of  stork.  If  not 
owned  bv  a  corporation,  the  names  and  address*  v 
of  the  individual  owners  must  be  given,  If  owned 
by  a  pariernershtp  or  other  unincorporated  firm, 
ils  name  and  address,  as  well  as  that  of  each 
Individual  niu  si  lie  given  J  Name  73  Inc  Peter- 
borough NH  OH 458.  Wayne  Green,  vote  Stock- 
holder Peterborough  NH  0345ft.  H.  Known  bond- 
holders* morttauet-s.  ^nd  other  secuntv  tn  > 
owning  or  holding  t  percent  or  more  of  total 
amounl  of  bonds,  mortgages  or  olher  securities  (If 
thrr*-  arc  none,  w&  state)  Same  none  (Signature  *nd 
tille  of  editor*  ^publisher,  business  manager,  or 
ouueri  Wayne  Green.  It.  Extent  and  nature  of 
circulation.  Average  no,  copies  each  issue  rjinnn: 
preceding  12  months.  Actual  number  *>f  en  pics  of 
single  issue  published  near  EST  to  filirtK  date.  A. 
Total  N"  of  f'*pie5  printed  (Net  Press  Hun) 
X, 79431,  V7960O.  B  Paid  circulation.  I.  Salei 
through  dealer*  and  carriers,  ilrret  vmdors  and 
counter  sales.  2.  Mail  subscript  tons  X  ,771*83* 
^78115.  C,  Total  paid  citculaljon  X.77WK3, 
Y, 7111 15.  D.  Pete  dtetfibulion  hv  mail,  rjmt  t  Of 
other  means.  I.  Samples*  complimentary,  and 
other  free  copies  N.22r>.  V.2^7.  2.  Copies  distri- 
buted to  news  agents,  hut  nui  sold.  E,  Total 
distribution  (Sum  of  C  and  D)  X.7B20H*  Y, 78353, 
F,  Office  vise,  left-over,  unaccuunU-d*  spoiled  aftel 
printing.  X,i223.  \  J248.  G.  Total  (Sum  of  E  &  F 
—  should  i-qual  net  press  run  fhimn  in  A)  X.79431. 
Y,79fiOO  f  Signature  of  editor,  publisher,  business 
manager*  or  owner  K  I  certify  that  the  statements 
made  bv  me  above  are  correct  and  complr' 
Signed.    Wayne    Green, 


16 


73  MAGAZINE 


W2NSD/1  continued  From  page  4. 
AVOIDING  IRS  DIFFICULTIES 

In  case  there  are  some  readers  who 
have  their  own  businesses,  who  some- 
day may  have  their  own  businesses,  or 
who  know  someone  who  has  or  may 
have  his  (or  her)  own  business,  f  think 
t  may  have  some  advice  worthy  of 
note. 

Number  one. .  .when  you  pick  an 
accountant,  be  sure  that  he  is  exper- 
ienced with  taxes  and  with  dealing 
with  the  I RS.  Be  sure!  Remember  that 
chances  are  that  the  only  reason  you 
have  to  pay  for  an  accountant  is  to 
prepare  your  tax  returns.  Any  reason- 
ably good  bookkeeper  can  do  all  of 
the  accounting  you'll  need  to  run 
your  business  and  have  a  fair  idea  of 
its  shape. 

The  tax  laws  are  so  complex  that  it 
is  impossible  to  even  get  two  IRS 
agents  to  agree  about  them  and  the 
interpretations  of  them.  We  get  just  a 
taste  of  this  with  our  wretched  re- 
peater regulations,  where  the  best 
brains  of  hamdom  are  bewildered. 
Well,  imagine  that  situation  multiplied 
by  several  thousand  times.  The  IRS 
continually  holds  schools  to  try  and 
keep  their  agents  up  on  the  newest 
aspects  of  the  rules,  but  there's  no 
way.  Now,  if  the  people  who  are 
running  the  show  can't  agree  on  their 
own  rules,  how  can  the  ordinary 
taxpaying  businessman  ever  hope  to 
cope  with  this  morass?  The  answer  is 
that  he  is  a  sitting  duck,  waiting  to  be 
knocked  off  by  any  IRS  agent  that 
happens  to  aim  in  his  direction, 

A  good  accountant  with  I  RS  tax 
experience  can  protect  you  from  these 
cossacks.  Remember  that  bunch  of 
Russian  gangsters  who  used  to  ride 
into  a  village  and  pillage  it?  If  you 
have  an  accountant  who  understands 
how  the  IRS  functions  you  will  never 
ever  have  to  face  the  agents  and  you 
will  not  have  to  face  a  judge  either, 
unless  you  happen  to  be  a  political 
martyr,  a  mafia  godfather,  or  a 
crook,  .  .or  any  two  of  that  set. 

The  average  businessman  depends 
on  his  accountant  to  make  aire  that 
his  bookkeeper  does  not  get  him  and 
the  business  in  trouble  with  the  IRS. 
Since  no  one,  not  even  the  best  IRS 
agent,  can  be  positive  about  every 
expense  made  by  the  company  or 
corporation  and  know  for  sure  that 
some  agent  won't  come  along  and 
declare  it  a  personal  expense,  it  is  up 
to  the  accountant  to  guide  the  book- 
keeper in  this  situation  and  to  try  and 
make  sure  that  the  client  does  not  get 
in  trouble,  This  is  so  involved  that 
there  is  no  possible  way  for  a  business- 
man to  double  check  the  accounts  on 
this,  he  just  has  to  depend  on  his 
accountant  and  bookkeeper. 

Should  an  IRS  audit  ever  material- 
ize, the  businessman  depends  on  the 
accountant  to  take  over  and  handle  it. 


There  should  never  be  a  time  when  he 
should  have  to  talk  with  the  agent- 
It  is  odd,  I  think  that  even  though 
the  expense  of  an  accounting  firm  is 
brought  on  almost  entirely  by  the 
demands  of  the  IRS,  that  a  business 
can't  take  this  expense  off  as  a  deduc- 
tion. This  is  obviously  inequitable.  A 
routine  IRS  audit  costs  around  $3000 
in  accounting  fees,  .  .certainly  that 
should  be  deductible!  How  come  ex- 
penses which  are  forced  by  the  go- 
vernment and  not  by  the  needs  of  the 
business  itself  can't  be  recovered? 

They  have  some  of  the  same  prob- 
lems with  sales  taxes,  as  I  recall. 
Businesses  have  to  collect  these  taxes 
for  the  state  or  city  and  bear  the 
expense  of  collecting  them  and 
keeping  the  records  involved.  Hey, 
Ralph  Nader,  where  are  you? 

If  my  memory  serves,  the  whole 
business  of  income  taxes  is  out  in  left 
field  and  has  never  been  ordained  by 
the  Supreme  Court,  It  got  started 
around  1912  or  so,  with  a  miniscule 
tax  and  the  promise  that  it  was  a  short 
term  thing  which  would  be  removed 
when  the  immediate  need  was  over. 
The  Court  has  avoided  coming  to  grips 
with  this  tax,  probably  on  the  grounds 
that  to  overturn  it  at  this  date  would 
be  to  overturn  the  country-  The  IRS 
has  gotten  too  big  even  for  the 
Supreme  Court!  There  is  little  doubt 
that  the  Court  would  have  to  declare 
income  taxes  unconstitutional  if  they 
ever  let  the  question  arise,  so  they 
have  to  make  sure  that  it  doesn't 
come  up. .  .which  they  do  by  ignoring 
it 


TAXPAYER  COMPLIANCE  PROGRAM 

The  IRS  is  always  looking  to  strike 
fear  into  the  hearts  of  the  taxpayers  in 
order  to  scare  them  out  of  trying  to 
avoid  taxes.  In  addition  to  their 
well-oiled  public  relations  staff,  which 
turns  out  pro-IRS  propaganda  by  the 
ton,  they  have  a  very  scary  policy 
which  is  called  the  Taxpayer 
Compliance  Program/'  They  are 
secretive  about  this  program, 
undoubtedly  because  if  the  public 
knew  that  they  were  throwing  away 
money  on  such  a  thing  the  chances  are 
there  might  be  a  taxpayer  complaint 
of  sizable  proportions. 

Despite  federal  laws  which  are  most 
clear  in  the  right  of  citizens  to  see 
such  government  manuals,  the  IRS 
rulebook  regarding  this  program  has 
been  kept  hidden  away  and  even  its 
existance  has  been  denied  by  the  IRS. 
One  man  has.  spent  years  trying  to 
force  the  I  RS  to  live  up  to  the  federal 
laws  which  should  force  them  to  let 
him  see  their  published  instruction 
manuals  for  agents. 

The  Taxpayer  Compliance  Program 
is  an  expensive  one,  but  apparently  is 


justifiable  in  the  minds  of  the  IRS 
heads.  What  they  do  is  take  a  case 
where  a  small  businessman  is  being 
given  the  shaft  by  a  special  agent  and 
call  in  hundreds  upon  hundreds  of 
witnesses  to  testify  against  him.  They 
call  in  people  from  all  over  the 
country  for  even  the  smallest 
amounts.  It  might  seem  odd  to  the 
rational  person  for  the  IRS  to  fly 
someone  from  one  coast  to  the  other, 
pay  their  expenses  for  the  trip  and  the 
hotel,  all  for  a  $5  expense.  The  bill 
could  come  to  nearly  S1000,  and 
certainly  would  be  no  less  than  $500. 
Why  such  extravagance?  Well, 
firstly  there  is  no  one  to  control  the 
IRS  from  such  wasteful  spending. 
Then  there  is  the  rationale  that  in  the 
long  run  it  is  worth  the  money 
because  the  person  who  is  brought  in 
to  testify  will  go  home  and  tell  all  his 
friends,  family  and  co-workers  that 
they  better  damned  well  pay  their 
taxes-  This  is  supposed  to  justify 
almost  anything  in  the  way  of 
expense. 

Put  yourself  in  the  position  of  such 
a  "witness/'  Let's  say  you  are  the 
circulation  manager  of  a  magazine  in 
California.  The  IRS  special  agent 
comes  to  you  one  day  and  asks  you  to 
verify  that  a  publisher  did,  in  1966, 
buy  a  subscription  to  your  magazine, 
a  one  year  subscription  for  $5.  You 
check  your  records  and  say  yes,  this  is 
true.  Then  the  special  agent  returns  in 
a  few  days  with  a  sworn  statement  of 
this  for  you  to  sign.  The  next  thing 
you  hear  is  that  you  are  to  be  ready  to 
appear  as  a  witness  for  the  IRS  in  the 
prosecution  and  not  to  leave  the 
country.  Never  mind  that  you  have  a 
trip  to  Tahiti  that  you've  been  getting 
ready  for  or  a  business  trip  to  Japan, 
you're  stuck.  You  can  imagine  what 
you'd  think  of  the  IRS  and  the 
publisher. 

Hundreds  upon  hundreds  of  such 
"witnesses"  are  harrassed  by  the  IRS 
in  "cases"  such  as  this.  Some  are 
threatened  and  intimidated,  and  many 
have  been  inconvenienced  to  a  subs- 
tantial extent.  Just  about  all  are 
scared  and  annoyed.  The  Taxpayer 
Compliance  Program  swings  along. 
would  bring  a  witness  all  the  way 
across  the  country  to  testify  to  one 
magazine  subscription  for  S5.  The  IRS 
special  agent  has  decided  that  sub- 
scriptions to  other  magazines  is  not  a 
business  expense  and  thus  has  chalked 
it  up  as  a  personal  expense  of  the  head 
of  the  company.  Has  the  special  agent 
asked  what  the  purpose  of  the  maga- 
zine subscription  was?  No. 

And  how  much  tax  is  involved  in  a 
S5  disallowal?  Well,  that  means  that 
the  taxpayer  has  S5  more  in  income  — 
income  not  declared  to  the  I  RS  —  and 
if  he  is  in  the  $12,000  range  this 
would   mean   a   tax  of  about  S2.50. 


DECEMBER  1973 


17 


Add  to  that  the  50%  penalty  for  not 
paying  the  tax,  and  you  have  S3.75. 
Then  add  6%  interest  per  year  and 
you  are  up  to  S5.98  in  tax  due.  Okay, 
the  taxpayer  is  billed  S5.98  for  a  S5 
disallowed  expense, .  .but  this  still 
leaves  the  company  owing  too.  Taking 
S5  off  the  expenses  of  the  company 
means  that  the  company  earned  S5 
more  than  n  reported,  tf  the  company 
is  making  a  modest  profit  this  un- 
declared income  would  be  taxed  at 
50%,  S2  50. .  .plus  the  50%  penalty 
for  it  being  unreported,  plus  66%  gives 
you  another  S5.98  due.  Thus  IRS  is 
able  to  run  up  a  tax  hill  of  $11.96 
when  they  disallow  one  $5  item. 

That  S1 1.96  doesn't  even  come 
close  to  the  S10OO  it  costs  to  bring  in 
the  witness,  but  that  is  how  the 
Taxpayer  Compliance  Program  works, 

TAX  ACCOUNTANTS  ARE 
HARD  TO  FIND 

While  73  Magazine  was  based  rn 
New  York  we  had  no  problem  in 
having  a  fine  tax  accountant.  .  .one  of 
the  best.  Then  we  moved  to  New 
Hampshire  and  looked  around  for 
someone  with  tax  experience  in  the 
area,  and  could  find  no  one, 

One  of  the  blacker  days  of  73's 
history  was  when  our  next  door  neigh 
bor  lost  his  job  as  head  of  the  Guem* 
sey  association  here  in  Peterborough 
and  became  the  local  representative  of 
General  Business  Systems,  a  large  na- 
tional accounting  firm.  We  got  talked 
into  using  this  service.  Then,  when  the 
IRS  agent  arrived  for  an  audit,  the 
local  rep  deserted  us  and  left  us  to 
handle  the  situation  alone.  This  is 
absolutely  unforgivable  for  an  ac- 
countant. No  client  should  ever  have 
to  deal  with  an  IRS  agent 

Word  of  wisdom:  should  this  ever 
happen  to  you,  run,  do  not  walk,  to  a 
good  tax  accountant.  Don't  fool 
around.  Don't  for  one  minute  thtnk 
that  just  because  you  have  been  hon- 
est in  every  way  that  you  can't  have 
prison  and  shattering  expenses  ahead 
of  you. 

If  you  know  of  any  business  that  is 
thinking  in  terms  of  using  General 
Business  Service,  you  might  ask  them 
to  drop  me  a  line  and  I'll  tell  them 
simply  and  factually  how  t  go  the  run 
around. 

We'll  have  more  on  the  IRS  next 
month.   Move  over,  Nadar, 


REPEATER  APPLICATIONS 

The  news  from  the  FCC  is  bleak 
indeed.  It  appears  that  all  pretense  of 
providing  any  sort  of  efficient  service 
has  gone  out  the  window  and  groups 
ftgurfng  to  put  new  repeaters  on  the 
air  or  to  modify  present  repeaters  are 
faced  with  incredible  d        s. 

Some  groups  have  met  his  bureau 


era  tic  bungle  (Walker,  we  all  told  you 
this  would  happen  if  you  insisted  on 
the  mountains  of  paperwork  and 
you  denied  that  it  could  happen)  by 
running  repeaters  on  an  informal  basis 
without  identification.  Obviously  no 
magazine  can  suggest  that  this  is  a 
good  approach  to  the  problem  —  but 
the  fact  is  that  there  is  no  good 
approach  to  the  problem. 

There  are  reports  of  several  groups 
that  are  just  throwing  the  new  rules  to 
the  winds  -  with  one  in  the  East  now 
boasting  almost  50  members,  none 
using  their  calls  over  the  repeater  — 
shades  of  CB!  We  are  seeing  how  one 
man  has  been  able  to  get  the  destruc- 
tion of  an  extremely  valuable  service 
started  -  cheers.  Walker 

Many  groups  are  groping  with  the 
new  rules  —  rules  which  have  frus- 
trated the  top  minds  in  repeaters  — 
trying  to  wend  their  way  through  the 
legal  thickets  toward  that  legal  ticket. 
The  ARRL  has  a  form  that  may  help 
-  send  a  sase  for  the  Repeater  Station 
Application  form.  It's  five  pages  long. 
so  put  on  a  couple  stamps.  That's 
ARRL,  Newmgton  CT  06 til,  in  case 
you've  lost  their  address  or  are  not 
familiar  with  the  outfit. 

NO  SAROC  THIS  YEAR 

The  Saroc  convention  was  such  a 
bomb  last  winter  that  we  here  at  73 
vowed  that  we  would  pass  it  up  this 
time.  The  whole  thing  consisted  en 
tirely  of  a  few  commercial  exhibits  as 
far  as  the  "convention"  was  con- 
cerned, with  virtually  nothing  planned 
for  talks  or  forums.  It  was  so  blatentty 
commercial  that  it  made  us  sick,  It 
was  obvious  that  the  whole  thing  was 
just  a  ruse  to  such  hams  into  coming 
to  Las  Vegas  to  drop  their  money  at 
the  gambling  tables. 

Who  needs  it? 

If  the  time  comes  when  the  ham 
going  to  Saroc  is  given  a  fair  shake, 
then  perhaps  we'll  come  out  again. 
Bur  the  show  isn't  even  run  by  hams 
any  more  as  far  as  we  know.  The  last 
we  heard  the  local  hams  wouldn't 
touch  the  "convention"  with  a  ten 
foot  pole. 

For  the  price  of  a  lost  weekend  in 
Los  Vegas  you  can  get  quite  a  bit  of 
ham  gear  and  have  fun  for  years 
instead  of  a  few  minutes.  .  Jf  that. 

For  two  years  running  Saroc  has 
been  a  bust.  Few  of  the  hams  that 
came  two  years  ago  showed  up  last 
year  -  so  who  will  be  there  this  time? 
They're  running  out  oF 
suckers. 


FCC  EMPLOYEE  DIES 
Though  the  FCC  denies  the  story, 
word    has   reached   73   Magazine   Ihnt 
tragedy   had  struck   the  amateur  divi- 
sion of  the  FCC  in  their  Washington 


office.    The   death    of   the  unnamed 

employee  might  have  gone  undis- 
covered except  for  an  alert  visitor 
from  a  repeater  group  in  Iowa  who 
insisted  on  finding  out  what  had 
happened  to  his  application  for  a 
license,  about  which  nothing  had  been 
heard  for  several  months. 

The  visitor  was  shown  to  the  re- 
peater application  processing  room 
and  he  began  searching  through  the 
mountains  of  tilings.  Imagine  his  hor- 
ror when  he  lifted  one  particular 
heavy  manuscript  and  discovered  a 
withered  hand  showing  in  the  gap! 

One  official  remarked  that  some  of 
the  secretaries  had  thought  it  odd,  but 
not  without  precedent  that  nothing 
had  been  in  the  outbaskei  of  that 
department  for  several  weeks. 

The  death  triggered  an  immediate 
investigation  of  other  nearby  offices 
and,  for  a  few  moments  it  was  feared 
thai  a  second  employee  might  have 
passed  away,  but  the  paycheck  test 
turned  out  to  be  positive  and  every- 
one was  relieved  to  find  that  the  chap 
was  merely  asleep. 

Since  the  normal  working  posture 
for  so  many  of  the  people  in  that 
department  is  difficult  to  tell  from 
sleeping,  a  good  deal  of  caution  is 
used  in  attempting  to  discover  if  an 
employee  is  working,  sleeping  or  de- 
ceased. The  best  test  discovered  so  far 
is  the  waving  of  a  paycheck  hear  the 
employee.  In  most  cases,  even  in 
deepest  sleep,  it  will  be  grasped.  This 
is  not  always  a  totally  reliable  test,  for 
the  reaction  to  a  paycheck  is  so  strong 
in  some  employees  that  even  in  death 
the  hand  will  reach  out. 

REPEATER  LICENSES 

The  latest  reports  from  the  FCC  are 
that  things  are  bogged  down  beyond 
all  description.  They  have  sorted  out 
the  mess  into  three  big  piles  —  the  old 
applic  tions  for  repeaters  needing  re 
licensing  -  new  applications  for  re-, 
peater  licenses  -  and  modifications  to 
present  licenses.  I  gather  that  we  are 
looking  at  a  one  to  two  year  detay, 
unless  some  sort  of  basic  changes,  not 
yet  in  the  works,  are  made. 

It  serves  no  useful  purpose  to  stand 
around  pointing  a  finger  at  Walker 
saying  we  told  you  so. 

Hopefully  the  hearing  in  January 
will  grease  the  shute  so  the  new  rules 
can  be  thrown  out  and  further  time 
and  money  by  the  FCC  saved. 

If  the  profusion  of  unneeded  and 
discouraging  limitations  on  repeaters 
is  not  thrown  out,  it  could  take  a 
couple  years  to  license  a  new  repeater. 
The  FCC  admits  to  over  600  appfica 
tions  being  on  file! 


18 


73  MAGAZINE 


NEW  ENGLAND  CONVENTION 

There  was  good  and  there  was  bad. 

The  weather  turned  out  to  be  excel- 

lent,  but  since  almost  all  of  the  action 

was  inside,  this  was  a  plus  that  many 

convention  goers  missed. 

It  was  a  little  difficult  for  some  of 
the  amateurs  who  were  not  among  the 
vyealthy  elite  to  drive  by  motels  with 
S8  off— season  signs  to  go  to  the  S28  a 
night  Dunfey's.  That  was  the  special 
convention  rate  —  it's  even  higher 
during  the  season! 

The  two  dozen  or  so  exhibitors  had 
no  serious  complaints  on  the  number 
of  hams  that  turned  up  on  the  week- 
end. Some  were  grumbling  quite  a  bit 
on  Saturday,  when  it  was  surprisingly 
deserted  —  particularly  those  who  had 
been  to  the  Evans  Radio  Open  House, 
which  was  really  packed  —  and  that 
was  way  up  in  Concord,  New  Hamp 
shire  the  weekend  before!  The  Sunday 
crowds  were  much  better  than  ex- 
pected, and  made  the  trip  worthwhile 
for  most  exhibitors. 

The  flea  market  was  spotty,  with 
only  a  handful  of  fleas  present. 

The  hotel  food  was  bad  and  incred- 
ibly expensive  —  which  accounted  for 
the  large  number  of  conventioneers 
walking  around  with  Burger  King  food 
trays  brought  in  from  a  couple  blocks 
away.  The  chef  at  Dunfey's  may  be 
one  of  the  world's  great  experts  in 
removing  the  taste  from  virtually 
every  type  of  food,  while  retaining  its 
appearance.  Perhaps  soy  bean  food  is 
here  and  can  now  be  made  to  look 
like  chicken,  corn,  and  potatoes.  Cer- 
tainly chicken  is  here  that  can  be 
made  to  taste  like  soy  bean  curds  —  or 
was  it  more  like  mongo  beans? 

Admittedly  my  nose  was  out  of 
joint,  and  it  would  have  been  difficult 
for  me  to  see  things  with  any  rosy 
glasses.  This  all  started  several  months 
ago  when  I  offered  to  set  up  the  FJV1 
program  for  the  convention  —  and  my 
offer  was  accepted.  Unfortunately  the 
program  chairman  had  not  cleared  this 
with  Newington  and  Huntoon. 

It  didn't  take  long  for  the  -  er,  fur, 
to  fly  and  it  ended  with  the  program 
chairman  having  to  call  me  and  tell  me 
that  for  the  third  New  England  con- 
vention in  a  row  I  would  not  be 
premitted  to  speak  on  any  forum  or  at 
any  banquet.  The  FM  program  was 
being  taken  over  by  Bruce  Marcus  and 
Gordon  Pugh.  This  was  somewhat  of  a 
disappointment,  as  you  might  im 
agine. 

The  fact  is  that  I  do  not  hold  either 
of  these  amateurs  in  great  esteem  — 
and  my  reasons  would  fill  a  book. 
With  some  encouragement  they  wttf 
fill  a  book. 

Since  I  had  quite  a  bit  of  news  to 
bring  to  the  convention  I  was  disap- 
pointed not  to  be  able  to  speak.  I 
wanted  to  tell  them  about  the  hearing 


Chairman  Burch  has  arranged  for  us  in 
January  —  about  the  further  develop- 
ments in  Jordan  -  about  possibilities 
for  development  of  amateur  radio  in 
several  other  countries  that  has 
evolved  from  this  pioneering  thrust  — 
and  about  late  news  in  the  fight  to 
save  the  220  MHz  band. 

So,  instead  of  giving  talks,  I  stood 
in  my  booth  and  sold  subscriptions 
and  listened  to  gripes  from  exhibitors. 
For  some  reason  many  o  them  were 
grumbling  that  little  was  selling  —  it 
was  a  different  type  of  crowd  from 
that  bunch  of  buying  fools  that  go  to 
Dayton  and  pick  every  booth  clean. 
Somehow  the  convention  did  not 
seem  to  bring  out  many  of  the  active 
hams  who  are  doing  most  of  the 
buying  these  days. 

Several  new  items  were  on  display 
and  drew  a  good  deal  of  attention. 
Venus  was  showing  their  new  slow 
scan  equipment  -  which  seems  to 
work  very  well.  Emergency  Beacon 
was  there  with  their  new  FM  unit  — 
the  one  which  has  everything  built  in 
that  you  can  imagine.  The  $1000 
ticket  on  it  slowed  some  of  us  down, 
but  we  must  remember  that  the  differ- 
ence between  a  man  and  a  boy  is  the 
price  of  his  toy.  This  will  separate  the 
me     from  the  boys. 

One  of  the  convention  attendees 
was  Julian  Sobin  and  his  wife  (of 
Sobin  Chemical)  and  they  are  headed 
over  to  China  again  for  another  visit,  I 
have  hopes  that  they  will  be  able  to 
help  open  up  an  interest  in  amateur 
radio  in  China,  I  sent  along  a  package 
of  back  issues  of  73  to  churn  the 
water.  Wouldn't  it  be  wonderful  if  I 
could  get  over  there  and  convince 
them  to  go  the  same  route  as  Jordan! 
There  is  nothing  that  China  could  do 
that  would  be  more  helpful  to  them  in 
opening  up  their  country  for  develop- 
ment —  communications  is  one  of  the 
most  basic  needs  for  the  growth  of 
any  country  —  and  this  means  people 
who  understand  communications  — 
and  how  better  to  get  them  than 
through  amateur  radio? 

On  the  strength  of  this  opening  I 
sat  down  and  wrote  a  one  page  intro- 
duction to  the  importance  of  amateur 
radio,  explaining  the  concept  of 
growth  through  the  development  of 
communications  —  and  the  role  that 
amateur  radio  plays  in  this  -  ending 
with  the  example  of  Jordan-  Copies  of 
this  paper  are  available  to  anyone  who 
has  a  good  use  for  it.  I  suggest  sending 
it  with  a  covering  letter  to  the  officials 
of  any  emerging  nation  that  you  may 
personally  know.  Let's  get  this  thing 
started!  I  stand  ready  to  pack  my 
toothbrush  and  go  anywhere  in  the 
world  where  they  are  interested  in 
getting  amateur  radio  going  -  I'll 
show  them  how  to  go  about  it  -  write 
regulations    fitted    to   their    needs    — 


and,  if  it  will  helpr  even  set  up  a 
station  or  two  —  and  perhaps  a  re- 
peater. 

Since  the  ARRL  HQ  went  to  so 
much  trouble  to  screw  me,  many  of 
the  exhibitors  seemed  to  feel  that  I 
should  be  the  center  of  their  com- 
plaints about  the  convention  —  so  I 
got  an  earful  I  of  the  miseries  they 
were  having  —  such  as  an  almost  utter 
lack  of  cooperation  on  the  part  of  the 
hotel  in  supplying  electricity  for  some 
exhibits  —  ceiling  fights  that  were  out 
and  darkened  some  of  the  exhibits  - 
electricians  apparently  explained  that 
they  had  been  out  for  a  couple  years 
and  nothing  could  be  done  -  the  high 
charges  for  stored  boxes  —  Collins  had 
a  bill  for  SI 5  just  for  storage!  -  and 
the  odd  layout  which  put  some  of  the 
exhibits  way  back  in  a  corner  where 
few  convention  goers  ever  found 
them.  I  wase't  surprised  at  all  to  find 
the  73  booth  back  there  -  I  think  we 
got  perhaps  a  hundred  amateurs  who 
managed  to  find  the  out  of  the  way 
corner  on  Saturday  —  on  Sunday 
morning  we  moved  the  damned  tables 
out  of  that  booth  and  up  front  by  the 
entrance  where  we  could  at  least  be 
seen. 

In  talks  with  Frank  Warnock  of  the 
Dayton  group,  I  suggested  that  next 
year  the  Dayton  committee  have  a 
group  of  amateurs  watch  the  parking 
lots  of  the  major  motels  to  try  and 
prevent  the  thefts  of  mobile  rigs  and 
antennas  which  marred  the  Dayton 
Hamvention  this  year.  The  New  Eng- 
land convention  could  sue  some  of  the 
same,  I  was  more  than  a  little  upset  to 
come  out  of  the  hotel  on  Saturday 
and  find  that  my  two  meter  antenna 
had  been  stolen  from  the  car.  Several 
other  amateurs  had  similar  com- 
plaints, and  some  apparently  lost  com- 
plete mobile  setups.  A  watch  from 
about  1 1  pm  until  7  am  would  be  easy 
to  arrange,  and  would  be  a  valuable 
service  to  everyone  but  the  manufac- 
turers and  distributors  of  antennas. 

Keith  spent  a  good  deal  of  the 
convention  flying  around  in  his  plane 
with  the  CI  egg  220  repeater  in  it, 
helping  new  220  repeater  records  to 
be  set.  The  amateurs  down  in  Lan- 
caster (PA)  were  able  to  work  through 
the  repeater  all  the  way  up  to  Provi 
dence  (Rl)!  It  is  obvious  that  a  plane 
is  the  proper  place  for  a  repeater. 

About  the  only  real  sour  notes  were 
comments  from  the  two  darlings  of 
the  League  HQ,  Marcus  and  Dana, 
who  put  most  CBers  to  shame  with 
their  vile  language.  It  is  disgusting  to 
hear  a  League  official  talk  over  the  air 
using  language  like  that  Many  of  us 
look  to  League  officials  to  set  a  good 
example  on  the  air  and  are  deeply 
disturbed  to  hear  otherwise.  With  the 
exception  of  the  temporary  19/79 
repeater,   two  meters  was  well  repre- 


DECEMBER  1973 


19 


sented.  The  main  repeater  set  up  was 
the  Derry  NH  group  WR1ABQ  on 
25/85,  with  an  assist  from  the 
WR 1 ABV  04/64  group  from  Waltham. 
The  07/67  WA1MHN  group  put  on  a 
whale  of  a  party.  And  so  it  went. 

The  Clegg  exhibit  was  a  point  of 
major  interest,  with  the  new  220 
repeater  being  shown  and  the  club 
purchase  plan  being  explained.  This  is 
a  clever  system  whereby  a  club  can 
buy  the  repeater  on  time,  and  the 
payments  grow  smaller  as  more  and 
more  of  the  club  members  buy  Ctegg 
21  transceivers  to  use  with  the  system* 

Several  clubs  have  gotten  started 
with  this  ingenious  system  already  and 
are  pioneering  on  220  MHz,  Operation 
up  there  is  a  dream  —  no  interference 
—  and  the  range  seems  to  be  even 
better  than  two  meters  in  most  cases. 
In  areas  where  there  are  too  many  two 
meter  repeaters,  this  would  seem  like 
a  good  way  to  go.  There  is  also  the 
element  of  sharing  in  the  development 
of  this  relatively  unused  band  —  the 
pride  of  knowing  that  you  are  in  there 
doing  something  —  and  having  fun  to 
boot- 


NIKON  SCHOOL 

Nikon  has  organized  a  few  teams  of 
experts  who  go  around  the  country 
giving  two  day  short  courses  in  photo- 
graphy, with  the  emphasis  on  Nikon 
cameras.  I  finally  managed  to  get 
together  with  one  of  these  in  October 
and  found  it  most  valuable.  Unfortun- 
ately, now  I  have  a  serious  need  for  a 
lot  of  equipment  that  I  never  knew  I 
needed  before,  I  wonder  if  any  readers 
have  some  Nikon  accessories  they 
might  want  to  swap  for  a  subscription 
to  73  or  modest  amounts  of  money? 
I'm  needing  such  things  as  the  No.4 
bellows,  the  No,4  slide  copier,  any  of 
the  filters,  extension  ring  K  setr  BR2 
ring,  BR3  ring  —  things  like  that 

In  the  past  I  have  visited  many 
clubs,  bringing  along  my  slides  of  one 
or  two  countries  and  showing  them. 
With  a  slide  copier  I  can  see  where  I 
could  make  some  good  copies  and 
thus  have  slide  programs  to  lend  out 
with  a  cassette  tape  commentary  for 
club  meetings  that  I  can't  get  to,  My 
programs  on  5Z4  -  ET  —  SU-JY  — 
OD  -  YK  -  Yl  -  YA  -  VU  -  XZ  - 
HS  -  9V  -  FK  -  VR2  -  5W1  -  KS6 
-  KC4  -  VP9  -  VP7  -  5B4  and  a 
few  other  might  be  interesting. 

A  recent  poll  indicated  that  about 
one  third  of  the  73  readers  are  into 
photography  as  a  second  hobby  —  so 
the  Nikon  school  may  be  of  interest 
when  it  comes  your  way,  Zeus  knows 
we  need  better  pictures  to  go  with 
articles  and  it  is  a  rare  month  indeed 
when  we  have  anything  usable  on 
hand  for  a  cover,  despite  our  requests 
for  good  cover  pictures. 


OCEANUS  CALLS 

One  of  the  newest  "countries"  of 

the  world  is  Oceanus  -  and  it  is  also 
by  far  the  largest  country  of  the 
world.  Oceanus  comprises  all  of  the 
oceans  of  the  world  outside  of  the 
three  mile  limits  of  land* 

For  some  odd  reason  the  oceans  of 
the  world  have  never  been  claimed  as 
territory,  even  though  they  are  all 
underlaid  with  ground  as  solid  as  that 
above  the  water.  In  early  days  the 
limits  of  land  territory  went  to  the 
water's  edge.  Then  this  was  extended 
to  a  three  mile  limit.  Recently  some 
countries  have  decided  that  their 
territpries  go  out  to  a  12  mile  limit  — 
and  even  a  200  mile  limit  has  been 
claimed  by  some  countries  who  are 
into  protecting  the  fishing  rights. 

But  as  the  development  of  the 
oceans  progresses,  with  oil  weds  being 
drilled  many  miles  out  at  sea,  and 
other  minerals  becoming  practical  to 
mine  at  seaf  the  concept  of  the  sea  as 
territory  will  evolve. 

Oceanus  has  set  up  a  government  of 
the  oceans  of  the  world  —  with  a 
constitution  similar  to  that  of  the 
United  States,  and  is  hoping  to 
achieve  recognition  of  the  ownership 
of  the  oceans  in  the  name  of  all 
mankind.  A  bill  is  now  in  the  Senate 

to  have  the  U.S.  recognize  Oceanus 
and  feelers  are  out  to  several  other 
nations  of  the  world.  The  advantages 
to  the  land-locked  countries  is  obvious 
—  they  would  have  a  share  in  the 
oceans  which  otherwise  would  be 
denied  them  —  and  since  the  oceans 
may  one  day  be  a  major  part  of  the 
wealth  of  the  world,  it  would  be 
almost  foolish  to  turn  down  an  oppor- 
tunity to  invest  in  this  concept. 

One  immediate  goal  of  the  Oceanus 
government  is  to  keep  the  oceans 
clean  for  the  future  —  to  bring  spoilers 
of  the  ocean  to  court  —  to  insist  that 
oil  spills  be  cleaned  up  —  that  new 
wells  be  drilled  only  when  there  is  a 
surity  that  no  oil  will  be  spilled  that 
will  not  be  cleaned  up  —  that  en- 
dangered species  of  ocean  life  will  be 
protected. 

Oceanus  has  set  up  a  system  of 
registering  ships  and  there  are  some 
advantages  to  registering  vessels  under 
the  Oceanus  registry.  This  does  not 
prevent  dual  registration  under  any 
other  country's  flag,  of  course. 

Amateurs  operating  aboard 
Oceanus  registered  vessles  may  be 
interested  in  applying  for  an  Oceanus 
call.  Calls  starting  with  the  single 
letter  "0"  will  be  issued  to  amateurs 
holding  valid  amateur  licenses  issued 
by  other  governments.  The  ITU  has 
been  notified  of  this. 

Citizenship  in  Oceanus  is  open  to 
the  citizens  of  any  other  country  and 
does  no?  in  any  way  affect  prior 
citizenship.   Dual  citizenship  is  com- 


mon these  days.  Citizens  of  Oceanus 
will  be  issued  an  Oceanus  passport. 

Getting  an  Oceanus  License 

In  order  to  get  an  Oceanus  amateur 
radio  license  you  must  be  a  citizen  of 
Oceanus  —  which  is  included  in  the 
license  fee.  Send  a  statement  as  ffdl- 
lows,  "I  wish  to  be  enroled  as  an 
Oceanus  citizen,  not  to  supercede  my 
previous  citizenship  committments.' 
Please  state  your  present  citizenship, 
furnish  a  copy  of  your  presently  valid 
amateur  license,  and  include  $5  in 
U.S.  funds  or  the  foreign  equivalent 

Send  this  to  Oceanus,  Office  of 
Telecommunications,  73  Magazine 
Street,  Peterborough  NH  03458, 
Please  make  the  check  out  to 
Oceanus, 

Calls  will  be  issued  starting  with 
01 A  A  and  progressing  to  O0ZZ. 

GOING  FIRST  CLASS 

The  Emergency  Beacon  ad  for  their 
new  superfantastic  two  meter  rig  got 
me  to  thinking  about  my  philosophy 
of  cheapskating  my  way  through  life. 
By  making  do  with  the  least  expensive 
way  of  getting  on  different  bands  I 
suspect  that  I've  missed  a  lot  of  fun 
that  I  might  have  had. 

Building  is  fun,  and  converting  sur- 
plus is  fun  too,  but  perhaps  I  would 
have  gotten  a  bit  more  out  of  amateur 
radio  if  I  had  prusued  those  aspects  of 
the  hobby  for  themselves  rather  than 
as  a  way  to  save  money.  On  the  other 
hand,  perhaps,  if  I'd  gone  the  first 
class  route,  I  might  not  have  had  the 
drive  to  build  and  convert,  and  I 
might  have  missed  a  lot. 

Back  in  1965  I  got  fed  up  with 
making  do  with  this  and  that  and 
decided  to  go  first  class  for  once.  Well, 
perhaps  not  truly  first  class,  but 
certainly  a  high  second  class,  I  put  up 
a  full  sized  three  element  twenty 
meter  beam  —  a  brand  new  transceiver 
—  and  a  Henry  2K  —  70  foot  tower  — 
and  I  got  busy  on  20m  and  had  a  ball. 
Compared  to  other  hobbies  the  invest- 
ment was  very  modest,  perhaps  $1200 
for  the  works.  That  won't  take  you 
far  fn  sports  cars  or  planes  -  or  boats. 

The  signal  was  first  class,  and  able 
to  get  through  most  pi leups{ except 
over  Asia  way  where  big  trees  shield 
the  signal).  The  result  of  my  big 
investment  in  1965  was  that  I've  had 
nine  beautiful  years  of  being  able  to 
work  DX,  I'm  not  a  big  country 
hunter,  but  I've  worked  100  in  one 
weekend,  just  to  prove  that  it  can  be 
done  —  and  I'm  somewhere  over  300 
total.  Not  being  a  certificate  fiend,  I 
haven't  counted  them  up  for  a  couple 
of  years. 

Going  first  class  has  not  seemed  to 
substantially  dent  my  enthusiam  for 
building  and  playing  around  with  new 
gadgets.    I've   had  a  lot  of   fun  with 


20 


73  MAGAZINE 


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DISCOUNT  PRICES  plus  full  war- 
ranty, call  or  write  for  fast  quote  on 
new  radios  and  accessories.  SBE144 
199.95;  Midland  13500  219.95; 
13520  W-T  209,95;  20%  plus  discount 
off  list  price  Hygain,  Mosley; 
TH6DXX  143.00;  Classic  33  124.00; 
15%  plus  discount  off  list  Triex, 
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27B  479.00  list;  Drake,  Swan,  Tentec: 
Write  tradein  prices.  Ham-M  99.00; 
TR44  59.95;  Beiden  8448  rotor  cable 
.10/ft;  8214  RG8  foam  .17/ft;  Moto- 
rola HEP  170  epoxy  diode 
2.5A/100QPIV  ,29,  25.00/1000  lot; 
Calrad  KW  SWR-relative  power  dual- 
meter  bridge  15.95;  Free  flyer.  Ship- 
ping charges  collect  All  items  guaran- 
teed. Madison  Electronics,  1508 
Mc  Kinney,  Houston  TX  77002. 
(713)224  2668,  Nite/weekend 
(713)497-5683. 

GOING  TO  SCHOOL,  must  sell  fol 
lowing  gear;  Deluxe  Clegg  6m  SSB 
receiver,  only  $230,  with  power  sup- 
ply. Heathkit  twoer,  A  1  condition, 
only  S30.  Conar  25  watt  CW  trans- 
mitter, only  $15.  Heathkit  DX-60  it, 
not  assembled,  parts  missing,  only 
S30.  You  pay  shipping.  Write:  S. 
Couch  WB0GAR,  1815  Princeton,  Ot- 
tawa KS  66067. 

GONSET  G-50  6m  Communicator,  6 
element  Cushcraft  6m  beam.  Best 
offer,  Wort  Cohen  WA2ARS,  3  Elk 
Lane,  Centereach  NY  (516)928-2673. 

FREE  BOOK  about  Digital  Logic  and 

Computers,  and  how  you  can  design 
and  build  your  own.  EEW,  Box 
8204 -BC,  Pittsburgh  PA  15217. 

SB34    SIDEBAND    TRANSCEIVER 

75-1 5m,  built  in  AC/DC  supplies  plus 
never  used  mobile  mount.  Total  oper- 
ating time  on  rig  near  20  hrs.,  almost 
brand  new!  Sorry,  no  microphone. 
$225,  Ron  Subka  WA9FPP/1,  Russell 
Station  Rd.,  Francestown  NH  03043. 


EQUIPMENT  FROM  73 

The  following  [ist  of  gear,  unless 
otherwise  noted,  consists  of  brand 
new  equipment  purchased  for  testing 
purposes  only.  Some  have  been  tested, 
some  remain  unopened  in  original 
cartons.  We  are  offering  this  gear  at  a 
considerable  discount  on  a  f  irst<:ome- 
first-served  basis.  Please  send  Money 
Orders  or  Certified  Checks  only  to  73 
Magazine,  Peterborough  NH  03458. 

Cap  Com  40m  solid  state 

SSB  xcvr  $150 
Heath  IB- 101  counter  with 

Vanguard  Scaler  $250 

Clegg  27B  2m  xcvr  $380 

IC-22  2mFMxcvr  $246 

Midland  1 3500  2m  xcvr  $200 

Midland  13509  220  xcvr  $200 

Tempo  CL  220  220  xcvr  $200 

Clegg  FM-21  220  xcvr  $255 

Regency  HR-6  6m  xcvr  $190 
HR2MS  8  channel 

scanning  2m  xcvr  $255 

TME-H-LMU  16  channel  rcvr  $255 

Digital  Logictocks  $  80 

Dycom  2m  repeater  $425 
Wilson  7  element  10  &  15m 

beam  (pick-up  only)  $250 

Waller  60A  power  supply  $105 
Standard  sr-c  120/5  power  sup,     $  44 

Gladding  12V  power  supply  $  60 

SBE  Scannavision  $650 

Robot  Monitor  $265 

Robot  Camera  $265 

AX  1 90  amateur  rcvr  $200 

SX  190  SWL  rcvr  $200 

Pickering  KB-1  keyboard  $200 

TP  L  502-B  2m  Amp  1  w/40w  $  1 1 0 

TPL  502  2  m  Amp  10w/45w  $  90 

Heath  HW-202  w/encoder  $180 

Heath  HWA-202-1  $  30 

Heath  HA- 2022  amplifier  $  70 

Gladding  8  channel  scanner  $1 10 

Gladding  HI -Scan  $150 

Regency  TMR-8-U  Scanner  3140 
Tempo  fmh  charger 

Heath  HM-2 102  wattmeter  $  30 

GTX-2  FM  xcvr  $225 

Newsom  2m  KW  amplifier  $350 

Temp -ONE  SSB  xcvr  $275 

External  VFO  $  80 

AC-One  power  supply  $  80 

FPM  300  SSB  xcvr  $480 

Heath  IC-2009  calculator  $  90 

SBE  450  FM  xcvr  $340 
MITS  ca  leu  later  w/ac 

adaptor  and  case  $  1 30 

Memory-Matic  8000  $320 


GENERAL  ELECTRIC  VOICE 
COMMANDER  III  solid  state  1  watt 
2m  portable.  Excellent  condition 
w/nicad  batteries,  charger,  leather 
case,  strap  and  remote  mic.  Complete 
GE  data  file  included  $90  ppd.  2  ea. 
GE  MT-33  transistor  powered  prog. 
30  watt  2m  mint  cond.  with  dusty 
accessories  $90  ea.  Complete  GE 
Mastr  pro.  70  watt  450  MHz,  mobile 
minus  basket,  Morotola  Motrac  50 
watt  6m  U51HHT  with  PL.  Looking 
for  Motorola  Motrac  and  Motran  450 
MHz.  Write  with  your  needs,  will 
trade.  John  Thornton,  12585  Jones 
Bar  Road,  Nevada  City  CA  95959. 


DRAKE  R4B:  Absolutely  Ml 
Proof  of  recent  factory  alignment  — 
$335.  Galaxy  Mark  II,  A.C.  Supply, 
Remote  VFO,  VOX,  Clock-Phone 
Patch  Console,  Mike  -  S375.  Bill 
Handel  K8SSY/6,  750  Stierlin  Rd. 
Apt.  131,  Mountain  View  CA  94043. 
(415)965-2691. 

ENHANCE,  FRAME  &   ORGANIZE 

your  QSL  cards  with  20  pocket  plastic 
holders.  Two  for  $1,  seven  for  $3, 
prepaid-guaranteed.  TEPABCO,  Box 
198M,  Gallatin  TN  37066. 

JEHOVAH'S  WITNESSES  WHO  ARE 
AMATEURS  Please  write:  Bob  Ellis 
WA4UQQ,  160  Lagoon  Road  SE,  Win- 
ter  Haven  FL  33880,  or  calf 
813  293  3595. 

STANDARD  5RC-826M  2M  FM  Tran 
sceiver  with  Newtronics  mobile  col- 
linear.  52-52  &  16-76  added.  $275. 
Lawrence  Rachman  WA2BUX,  2  Mag- 
gio  Lane,  Old  Bethpage  NY  11804 
(516)  694-3487. 

FREE  with  the  purchase  of  a  new 
Genave  GTX-200  at  $259.95:  18 
crystals  of  your  choice.  Send  cashier's 
check  or  money  order  for  same-day 
shipment.  For  equally  good  deals  on 
Drake,  Standard,  Clegg,  Regency,  Mid- 
land, Hallicrafters,  Tempo,  Kenwood, 
Ten-Tec,  Galaxy,  Hy-Gain,  CushCraft, 
Mosley,  Sony,  and  Hustler,  write  to 
Hoosier  Electronics,  your  ham  head- 
quarters in  the  heart  of  the  Midwest, 
Become  one  of  our  many  happy  and 
satisfied  customers.  Write  or  call  to- 
day for  our  low  quote  and  try  our 
individual,  personal  service*  Hoosier 
Electronics,  Inc.,  RR25,  Box  403, 
Terre  Haute  IN  47802. 
(812)894-2397. 

FOR  SALE;  Motorola,  G.E.,  RCA  FM 
mobiles.  Hammarlund  HX  500  and 
HQ  170A.  3  in,  refracting  telescope. 
Radio  magazines  back  25  years,  SASE 
for  details.  W9DGV,  221030th 
Street,  Rock  Island  I L  61201. 

TOUCHTONE:  Aeco  receiver  with 
schematics,  S50;  desktop  pads  with 
cases,  $20;  Trimline  TT  phones  com- 
plete, $25;  keyboards,  oscillators  $8 
ea;  GenL  Radio  slotted  line  type 
874- LB  A,  with  stubs,  adj,  lines,  etc., 
$150.  Mod  19,  synch,  with  CV-89A 
TU,  $100.  Repairs  and  engrg.  info  on 
Automatic  Electric  Co.  eqpL  Swaps 
invited,  want  2m  base  station.  Mod  14 
typing  reperf.  Doug  WA1QEV,  3  Hall 
Ave,,  Nashua  NH  03060. 

SWAN  CYGNET  270B  10  80M  trans- 

ceiven  Mint  condition  11/2  years  old. 
Call  or  write  WA1QLK  15  Greenough 

St.,  Brooklrne  MA  02146. 
(617)734-0661  Asking  $390. 

R-390A.  Clean,  good  condition  elect 
ricafly,  mechanically,  $456.   Includes 
crating    and    shipping.    W6ME,   4178 
Chasin  Street,   Oceanside  CA  92054. 


DECEMBER  1973 


21 


— 


STEAL  THIS  EQUIPMENT  MOV- 
ING -  Must  sell  Mosley  TA-33 
Senior,  Mostey  14  AVQ  vertical,  Cush- 
craft  H-etement  2m  beam,  Motorola 
W43GGV  mobile  transceiver,  Moto- 
rola base  transceiver,  Superex  APS 
headphones,  Hallicrafters  SR-42A  2m 
transceiver.  Heath  IG-10  color  gener- 
ator; Terado  275  watt  inverter  (never 
used),  Elco  oscilloscope,  Drake  MS-4, 
TR-44  rotor,  make  offer  on  any  or  all. 
Will  ship.  Bob,  30  Sunset  Blvd.  Mass- 
apequa  NY  11758. 

TRADE:  SB  33  15  to  75mtrs.  Trans- 
ceiver with  mobile  supply,  for  2m  FM 
transceiver.  NYC  area  only.  S.  Kraman 
941-8780.  After  7:00  PM, 


SURPLUS  TEST  EQUIPMENT,  VHF 

and  microwave  gear,  new  and  used, 
checked  for  operation.  Send  for  bul- 
letins. David  Edsall  WA4EZM/3,  2843 
St  Paul,  Baltimore  MD  21218. 

TECH  MANUALS  —  for  government 
surplus  gear  $6.50  each;  WRM-25D, 
TT-63a/F  GC,  TS-382D/U, 
R-389/U  R  R,  R  -390/URR, 
R-220/URR,  R-274/FRR,  BC-610, 
URM-32,  ALR-5.  W3IHD,  7218  Ro- 
anne  Drive,  Washington  DC  20021. 


NEED  PARTS?  Ve carry  parts  for 
R-388  -390  -390A  -391  -392  1051 
-51S1  -Nems  Clarke-RacaL  Also  pack 
radio  sets  -  PRC-25  -41  41  62  70 
-71  -73  -74  -77.  If  you  need  a  part  no 
matter  what  you  need.  If  it's  U.S. 
government  we  have  or  can  get  it. 
Also  we  want  to  buy  or  trade  all 
aircraft  communications.  All  ground 
radio  communications.  All  plug-in 
modules  &  control  heads.  No  matter 
what  condition  bent  or  busted  we  will 
buy.  We  have  for  trade  R-388  390 
-390A  392  -51S1  -51J4  -1051  -Nems 
Clarke- Racals  &  new  ham  gear.  D&R 
Electronics,  RD1  Box  56,  Milton  PA 
17847,  Phone  1(7171742-4604  after 
6:00PM. 


SWAN  600R  CUSTOM  SS-16  with 
CW  filter,  600T,  600SP.  One  year  old, 
$800,  Mike  Sullivan  535  Eagleview 
Ct.,  ZIonsville  IN  46077,  call  evenings 
(317)873-3225, 


FOR  SALE:  Gonset  903 -A  Mark  II 
600w  2m  amplifier,  FM,  CW,  SSB, 
AM.  Excellent.  $275.00.  WANTED: 
Gonset  3357  VFO,  Hi-Gain 
18AVT/WB,  Jim  Gysan  WtVYB 
1617)922-3850. 


MERRY    XMAS  AND  HAPPY   NEW 

YEAR  FROM  W0CVU.  On  the  air 
since  1913.  Using  one  KW  Collins 
KWS  1  and  75A4.  Telrex  separate 
beams  three  elements. 

MONITOR    POLICE/FIRE    Dispatch 
ers!  Catalog  shows  official  directories 
of  channels,  nationwide.  Use  with  CD, 
MARS,  RACES,  etc.,  work.  Send  No. 

10  SASE,  Communications,  Box 
56-W,  Commack  NY  1 1725, 

FREE!  FREE!  FREE!  Well  ship  you 

your  choice  oT  a  base  or  mobile 
antenna  from  our  nationally  famous 
manufacturer  when  you  purchase  your 
new  Regency  ham  rig  at  our  regular 
price.  AR-2,  $119;HR-2B,  S229; 
HR-220,  S239;  HR-6,  S239;  HR-212, 
$259;  HR-2MS,  $319.  Enclose  check 
or  money  order,  ,  .we  pay 
shipping,  .  .NO  COD,  Marine  Radio? 
Write  for  free  catalog.  Great  River 
Radio,  Box  65,  West  Burlington  I A 
52655. 

FOR  SALE,  Motorola  L41GGB  6m 
base  station  on  52.525,  immaculate 
cond.,  also  J57AAB  60  watt  2m  base 
station  or  37/97  with  remote  control 
panel  in  4  1/2  inch  outdoor  cabinet, 
125  each  or  trade  for  2m  diplexer. 
W8HEE,  140  Ash,  Whitmore  Lake  Ml 
48189. 


RTTY,  with  slow  scan,  and  things  like 
that.  It  has  made  it  so  I  could  sit  and 
talk  with  friends  around  the  world 
with  a  lot  less  interference  problems. 

On  two  meters  I've  gone  about  the 
same  route*  I  started  off  with 
jury— rigged  gear  and  eventually  went 
the  first  class  route  -  and  have  been 
thankful  ever  since  I  made  the  change. 
I  run  a  22— channel  rig  with  a  nice 
TPL  130  watt  amplifier  -  and  I  work 
out  extremely  well.  You  can  be  sure 
that  I'M  be  getting  a  synthesized  rig  as 
soon  as  they  are  available  fn 
quantity.  .  .and  I  can  find  one  that  fits 
my  car.  I  wonder  if  I  can  fit  one  of 
those  EBC  rigs  in  there.  .  .? 

Going  first  class  costs  a  little  more, 
but  the  extra  fun  involved  seems  to 
more  than  make  up  for  the  little  more 
per  day  that  it  costs,  I  will  always 
remember  an  old  buddy  of  mine  who 
used  to  have  the  motto,  "For  a  few 
cents  extra  you  can  go  first  class/' 

DESPITE  WALKER'S  - 

Promise  to  throw  out  any  petitions 
for  repeater  rule  changes,  made  to  the 
group  at  Rochester,  the  McCoy  wing 
of  the  ARRL  is  working  on  another 
attempt  to  get  Walker  to  back  down 
via  the  petition  route.  In  view  of  the 
upcoming  hearing  before  the  Com- 
missioners in  January,  this  might  be  a 
way  to  take  some  of  the  hear  off  for 
Walker. 

The  ARRL  petition  is  a  compro- 
mise  affair,  asking  for  some  needed 
changes,  but  falling  far  short  of  asking 


for  what  is  really  important:  freedom 
from  restrictive  regulations  which 
have  no  real  purpose.  For  instance, 
they  will  ask  that  the  repeater  chan* 
nels  be  considered  for  repeater  use 
and  the  Walker  concept  of  simplex  use 
forcing  a  repeater  to  shut  down  be 
given  a  proper  burial.  They  would  like 
to  have  the  antenna  patterns  deleted. 
They  want  repeaters  to  be  able  to 
make  changes  without  prior  approval 
by  Walker  —  which  could  save  a  year 
or  two  at  the  present  snail's  pace  of 
the  FCC.  They  want  no  limit  to  the 
number  of  control  operators  —  there 
was  no  limit  set  in  the  regulations, 
only  in  the  Walker  interpretations. 
They  want  crossband  —  and  so  does 
everyone  else.  Walker  gets  livid  when 
this  is  brought  up.  Repeaters  should 
be  linked  as  desired.  They  would  like 
an  increase  in  6m  power  allowance  — 
I'd  like  to  see  all  power  limitations 
taken  off  other  than  our  basic  man- 
date  of  one  kilowatt. 

The  ARRL  is  going  to  ask  for 
control  on  the  same  channel  —  and,  if 
there  is  any  real  question  about  econ- 
omy of  channels,  this  makes  sense.  It 
can  be  done  quite  effectively,  so  why 
require  a  450  link?  They  also  want 
any  kind  of  control  legalized  —  our 
responsibility  should  be  to  control  the 
repeater  in  the  best  way  for  each  of  us 
—  and  it's  none  of  the  FCC's  business 
how  we  do  it,  whether  it  be  by  direct 
control,  wire  line,  link,  etc. 

Since  the  FCC  demanded  maps  are 
not    available    for    all    parts    of    the 


country  they  are  going  to  ask  that 
substitute  maps  be  accepted,  Nuts,  sez 
I,  why  should  we  have  to  submit  any 
map  at  all?  The  FCC  isn't  setting  up 
our  repeaters  like  FM  stations,  so  this 
is  a  complete  waste  of  our  time  and 
money  and  to  no  possible  purpose. 

My  own  idea  is  that  we  should  ask 
the  Commission  to  throw  out  all  of 
the  restrictions  set  up  in  docket 
18803.  Most  of  these  objectionable 
rules  were  set  up  to  help  us  avoid 
future  problems  which  Walker  im- 
agined we  might  encounter.  Since  he 
apparently  was  not  well  versed  on  our 
present  state  of  the  repeater  art,  it  is 
not  surprising  that  his  crystal  ball  was 
pretty     cloudy. 

GALLOWS  HUMOR 

For  some  odd  reason  the  FCC 
decided  to  set  up  an  exhibit  at  the 
convention  in  Reston,  VA,  in  Septem 
ber.  The  exhibit  arrived  in  three  huge 
packing  crates  stenciled  "Property  of 
the  FCC/'  to  which  someone  had 
added  to  one  of  them,  "Repeater 
Rules,  Box  one  of  three," 


FILING  REPEATER  MODS 

You  may  be  able  to  save  a  year  or 
more  on  getting  modifications  to  your 
repeater  license  accepted  if  you  re- 
member that  the  intention  of  the 
Walkergroup  is  to  throw  out  your  old 
application  forms  and  replace  them 
with  the  new  ones.  So  make  sure  that 
you  essentially  resubmit  your  whole 


22 


73  MAGAZINE 


iling  with  each  modification,  whether 
it  be  for  a  different  antenna,  a  change 
in  type  of  coax  or  length  of  coax  to 
the  antenna,  location  of  the  repeater 
(Walker  refuses  to  officially  establish 
an  interpretation  of  the  rules  on  this, 
so  even  a  one  foot  move  of  the 
antenna  could  cafl  for  a  modified 
license},  means  of  control,  power,  etc, 

SOMETHING  TO  TALK  ABOUT! 

Though  one  would  be  hard  put  to 
discover  this  from  a  casual  tune 
around  the  amateur  bands,  there 
actually  are  other  things  to  talk  about 
than  signal  reports,  the  equipment 
being  used  to  talk  about  the  equip- 
ment,  and  the  weather. 

For  instance  there  are  wonderful 
possibilities  in  the  newer  FCC  regula- 
tions and  the  proposed  changes  in 
rules.  Many  operators  need  a  dozen  or 
two  good  contacts  to  build  up  the 
level  of  outrage  needed  to  properly 
answer  the  FCC's  proposal  to  open  a 
new  citizen's  band.  This  is  so  prepos- 
terous that  many  of  us  tend  to  just  try 
and  ignore  it  —  like  some  terrible 
calamity  that  we  refuse  to  really  face. 
Perhaps  if  we  talk  about  these  things 
over  the  air  a  bit  they  will  become  real 
enough  so  we  can  sit  down  and  do 
them  justice  in  our  comments  to  the 
Commission. 

But  there  are  other  things  to  mull 
over  too.  Mutual  indignation  contacts 
are  okay  now  and  then,  but  they 
make  a  lousy  steady  diet. 

Now,  to  get  around  to  the  point 
(for  a  change)  -  there  are  some 
pocketbooks  around  that  are  most 
fascinating  and  which  have  so  much 
incredible  data  in  them  that  you 
should  be  able  to  stop  any  roundtable 
flat  in  seconds.  One  of  the  best  of  the 
breed  is  a  Dell  book,  "Mysteries  From 
Forgotten  Worlds,"  which  is  Dell 
6214  and  costs  $1.25.  Another  excel- 
lent book  of  the  gendre  is,  "We  Are 
Not  The  First,"  Bantam  Q7534, 
$1.25,  by  Tomas.  If  this  begins  to  get 
to  you,  you  may  want  to  get  back  to 
the  first  of  this  series,  books  by 
Daniken,  Bantam  G5753,  $1.25, 
'Chariots  of  the  Gods?"  —  which  was 
featured  in  the  television  special  "In 
Search  of  Ancient  Astronauts/1  and 
Bantam  Q7276,  $1-25,  "Gods  From 
Outer  Space." 

These  books  introduce  you  to  inter* 
pretations  of  ancient  texts  and  archae- 
ological findings  which  suggest  strong- 
ly that  there  may  have  been  some 
previous  civilizations  that  were  quite  a 
bit  more  advanced  than  we  have 
hitherto  suspected. 

One  example  which  several  of  the 
books  discuss  is  the  Piri  Reis  maps, 
recently  discovered  in  the  Topkapi 
musuem  in  Istanbul,  and  which  appar- 
ently were  copied  from  maps  that 
Columbus  used  on  his   trip  —  which 


were  in  turn  copied  from  much  earlier 
maps.  The  interesting  thing  is  that  the 
maps  show  the  Americas  in  good 
detail,  including  remote  reaches  of 
South  American  rivers  -  and,  most 
astounding  of  all,  the  Antarctic  con- 
tinent is  shown  correctly  as  it  would 
be  without  the  layer  of  ice  which  is 
thousands  of  feet  deep! 

By  way  of  a  short  check  on  the 
material  in  the  books  above,  I  called 
Father  Lineham  W1HWK,  the  head  of 
the  Weston  Observatory  and  an  old 
friend,  to  ask  him  about  the  Reis 
maps.  He  had  worked  with  them  a  few 
years  back  and  was  quite  familiar  with 
them.  He  substantiated  that  the  maps 
did  indeed  show  Antarctica  as  it 
would  be  without  the  ice  coverage  — 
and  he  pointed  out  that  the  ice  is  not 
hundreds  of  years  old,  as  reported  in 
books,  but  is  millions  of  years  old. 

The  Father  pointed  out  that  the 
Reis  maps  show  Greenland  as  three 
separate  islands,  a  fact  only  recently 
discovered  by  echo  sounding  of  the 
millions  of  years  old  icecap.  He  also 
affirmed  that  there  is  good  reason  to 
believe  that  Columbus  had  indeed 
used  predecessors  of  the  Reis  map. 

If  the  other  reports  in  the  books  are 
even  half  as  accurate  as  the  Reis  map 
story,  then  there  is  a  lot  to  think 
about.  It  would  only  spoil  it  for  you 
to  tell  you  about  discoveries  of  2000 
year  old  batteries,  an  intricate  com- 
puter of  about  the  same  age,  precise 
calculations  of  the  circumference  of 
the  earth  dated  300  BCr  and  things 
like  that.  Have  fun  —  and  start 
boggling  minds  on  the  air  a  bit. 

RECENT  CONVENTIONS 

The  Hamburg  Hamfest  was  a  real 
winner  this  year  —  the  manufacturers 
who  exhibited  there  got  all  the  atten- 
tion they  could  ask  -  and  then  some. 
Watch  out  for  an  even  bigger  affair 
next  year  -  and  don't  pass  up  this 
new  and  growing  hamfest.  It  is  a  fact 
that  you'll  get  better  treatment  here 
and  more  personal  attention  than  at 
any  other  hamfest. 

Dayton  is  going  a  full  weekend  in 
1974  -  and  that's  great  news.  The 
committee  expects  that  they  may  pull 
in  over  8000  this  time,  setting  an 
all-time  record.  Dayton  has  the 
largest  exhibition  area  —  the  largest 
flea  market  -  the  largest  attendance. 

Hyannis  came  off  about  as  pre- 
dicted, The  Saturday  turnout  was  a 
little  thin,  but  Sunday  was  better  than 
in  the  past  and  made  up  a  bit  for  it. 
The  exhibit  area  irritated  a  lot  of  the 
exhibitors  -  troubles  with  getting 
power  -  trouble  with  lights  —  trouble 
in  bad  locations  of  booths  -  trouble 
finding  anyone  to  help  with  problems 
—  exhorbitant  storage  fees  for  boxes 
shipped  ahead  —  things  like  that. 
Distributors  were  disappointed  as  few 


amateurs  appeared  to  have  brought 
any  money  —  there  seems  to  be  some 
problem  with  this.  .  .many  of  the 
staunch  ARRL  members  apparently 
are  not  active  hams  and  are  uninter- 
ested in  buying  anything.  Odd. 

Reston  Virginia  was  a  frost  accord- 
ing to  reports.  The  turnout  was  very 
thin  and  exhibitors  needed  a  deck  of 
cards  to  keep  busy.  The  high  spot  of 
the  convention  was  a  sign  on  one  of 
the  three  huge  crates  that  were  part  of 
the  FCC  exhibit,  ''Repeater  Regula- 
tions, Box  1  of  3/' 

Same    1974    —    is   anyone  going? 

Almost  all  the  manufacturers  we've 
talked  with  are  planning  on  passing  up 
this  bomb. 


MORE  COUNT 

Should  contacts  with  a  country 
count  as  long  as  we  are  certain  that 
the  station  really  is  in  the  country 
claimed?  ARRL  has  long  had  this 
thing  about  not  accepting  clandestine 
operation,  even  though  there  was  no 
question  about  it  being  where  claim- 
ed. I  recall  one  instance  wherein  the 
League  almost  destroyed  an  Iron  Cur- 
tain country  ham  by  sending  a  card 
back  to  the  officials  asking  if  it  were 
okay. 

For  instance  —  Turkey.  At  present 
there  are  a  few  hams  there  —  and  in 
recent  years  there  has  at  times  been  a 
good  deal  of  clandestine  operation 
there,  complete  with  QSL  managers. 
Should  these  cards  be  counted  for 
awards  and  certificates?  What  do  you 
think? 


FCC  HEEL  DRAGGING 

A  visiting  foreign  amateur  managed 
to  get  a  reciprocal  license,  but  it  took 
him  three  long  months  of  hard  work 
to  get  it  through  the  FCC  in  Washing 
ton.  Apparently  the  Commission  is 
not  only  bogged  down  on  repeater 
licenses,  but  on  other  apsects  of  ama- 
teur license  processing  too.  If  Walker 
would  spend  a  little  time  trying  to  get 
his  department  moving  and  being  con- 
structive instead  of  making  one  hassle 
after  another  for  us,  ridiculous  delays 
like  this  might  be  avoided. 

MORE  SALES  HELP 

If  you  just  look  at  the  number  of 
ads  in  this  issue  of  73  you  can  see  why 
more  people  are  needed  in  the  73 
advertising  department  We  hope  that 
there  are  one  or  two  amateurs  who 
might  be  interested  in  working  at  this. 
Sales  experience  is  important,  of 
course-  Living  in  New  Hampshire  is 
great,  so  give  us  a  call  if  you  think  you 
might  be  able  to  handle  the  job. 

.  .  .  WA  YNE 


DECEMBER  1973 


23 


Hallicraf  ters'  all-american  made  FPM-300, 

Mark  II  "Safari"  SSB/C W  transceiver  is  Q5 . . . 

from  the  Mauritania  solar  eclipse  expeditions 
to  a  famous  raft  adventure  in  the  Atlantic. 


Proven  design  in  the  tradition  of  the  HT-37 
and  solid-state  dependability  are  combined  in 
this  compact  transceiver  featuring  state-of- 
the-art  FETs,  hot  carrier  diodes  and  bi-poiar 
transistors  for  peak,  reliable  performance  for 
only  $625. 

Some  of  the  high  performance  specifications 
are: 

•  Designed  for  fixed,  portable  and  mobile  use 

•  Equipped  with  a  self-contained  Universal 
AC  and  DC  power  supply  system 

•  Compact  dimensions  (HWD)  5Y2  x  12  x  11 
inches 

•  Weight:  25  pounds 

•  Tuning    ranges:   8-600    kHz    Bands,   80-10 
meters 

•  Built-in  speaker 

•  Power  requirements:  117  V  or  234  V  50/60 
AC:  13.4  VDC  negative  ground 

•  Modes:  Selectable  Upper  or  Lower  Side- 
band-CW  or  RTTY 

•  Type  of  service:  continuous  operation  with 
2-tone  S  SB-CW-RTTY  (50%  duty  cycle) 

•  Power  Output:  125  Watts  PEP.  (Nominal) 
into  50  ohms 

•  Receiver   Sensitivity:   Less  than   1    uV  for 
15  dbSN  Ratio 

•  Selectivity:  2.0  kHz 

•  Receiver  IM:   60  db  below  2  equal  10MV 
signals 

•  Receiver  Image  and  IF  Rejection:  Greater 
than  60  db. 


Internal  Receiver  Spurious:  Less  than  equiv- 
alent! Microvolt  Signal 
Transmitter  IM;  30  db  below  P.E.P.  (26db 
below  one  of  two  equal  tones) 
Adjacent  Channel  Desensitizing:  3  db  with 
greater  than  10,000  MV 
Sideband   Suppression:    -50   db   minimum 
(5  1  kHz 

AF  Power  Output:  2  watts 
Stability:   100  Hz  after  warmup-  Max.  100 
with  10%  line  voltage  change 
Frequency   Readout:   Within   1    kHz  ±  100 
kHz  of  Cal.  Point  not  more  than  3  kHz  across 
entire  500  KC  Band 
Break-In  CW:  Semi-Automatic 
CW  Sidetone 

Audio  Frequency  Response:  500-2500  Hz 
Nominal 

AALC:  1 2  db  Compression 
AGC  Figure  of  Merit:  60  db  minimum 
Crystal  Calibrator.  Provides  25  kHz  Calibra- 
tion Signals 

Optional  Accessories:  MR -300  Mobile  Instal- 
lation Kit;  HA-60  Blower  Fan  Kit,  works  on 
ACor12VDC 


See   your   Hallicrafters   distributor   today   or 

write  or  phone: 

The  Hallicrafters  Co.,  60C  Hicks  Road,  Rolling 

Meadows,  III.  60008  U.S.A. 

Phone:  312/259-9600 

You  should  be  talking 
with  a  Hall      ~ 


CODE 


WilfMaillet  VE1BU/W3 
3/3  Summit  Hall  Road 
Gaithersburg  MD  20760 


LAY 


WPM 


SKtED 
AUTO 


DISPLAY 
COUNT  TEST 

Off  TIMER 


MOOf 


KEYER 


RESET 


VE1BU 


The  first  acquaintance  with  semi- 
conductors for  many  hams  came 
through  the  building  of  an  electronic  keyer. 
This  gave  the  ham  a  chance  to  experiment 
and  learn  with  a  fairly  simple  and 
non-critical  circuit.  With  the  advent  of  inte- 
grated    circuits     (IC's),     the     same     thing 


DISPLAY 


I 


DISPLAY 


COUNTER 
DECADE 


rz 


COUNTER 
UNITS 


60  Hi      m 


LINE 
FREQUENCY 


DOTS 


IjrcwvERTWj  FR0M  Kj^ 


happened  all  over  again*  The  natural  circuit 
for  application  of  these  IC's  for  the  ham  was 
again  the  key  en  The  first  IC's  were  digital, 
either  on  or  off  and  were  easily  adapted  to 
the  on/off  characteristic  of  code. 

Now  that  many  hams  have  a  keyer,  it 
may  be  time  to  add  an  extra  goodie  to  it. 
This  article  describes  a  circuit  made  up  of  a 
few  IC's  that  displays  your  sending  speed  in 
words  per  minute.  Halfway  between  a  speed 
marked  5  and  15  on  your  keyer,  never  did 
mean  10  wpm.  Now  you  can  really  know 
your  sending  speed  and  impress  the  neigh- 
bors with  this  new  gadget  in  your  ham 
shack. 

Block  Diagram 

The  ARRL  Handbook  gives  a  formula  for 
calculating  code  speed. 


o       j  /          \     dots/min, 
Speed  (wpm)  = yz — 


Fig.  L  Block  diagram  of  the  code  speed  display. 


or  Speed  (wpm)  =  dots/2.4  sec. 


DECEMBER  1973 


25 


GND    +5 

le lie 


+5   u 

GND — ^ 


the  timing  is  the  60Hz  from  the  ac  line.  A 
filament  transformer  steps  down  the  voltage 
and  the  shaper  prevents  the  noise  that  may 
be  present  on  the  ac  line  from  producing 
false  trigger  pulses.  The  60  Hz  is  then 
divided  by  1 44  which  yields  a  pulse  each  2,4 
seconds.  This  pulse  goes  to  a  flip-flop  which 
develops  a  positive  pulse  for  2.4  seconds. 
The  positive  pulse  enables  a  gate  which  lets 
dots  to  the  counter.  The  timing  circuit  also 
resets  the  counter  and  enables  the  circuit  to 
operate  without  manual  reset.  The  counter  is 
made  up  of  two  decode  counters  which 
enable  it  to  count  to  99.  The  decode  counter 
outputs  go  to  a  binary  coded  decimal  (BCD) 
to  seven  segment  decoder  which  in  turn 
drives  the  display. 

This  description  will  give  those  with  a 
knowledge  of  digital  circuit  techniques 
sufficient  ideas  to  get  going  and  build  the 
circuit  with  their  dwn  variation  of  com- 
ponents. However,  for  those  without  too 
much  experience,  the  design  will  be 
reviewed. 

Circuit    Description 

Fig,  2  is  the  schematic  of  the  code  display 
unit.  The  shaper  uses  a  Fairchild  9602  single 
shot.  When  pin  4  receives  a  voltage  greater 
than  1 .2  but  less  than  5  V,  a  pulse  appears  at 
pin  6.  The  width  of  the  pulse  at  pin  6  is 
determined  by  the  RC  combination.  With 
pin  7  fed  back  to  pin  5,  the  single  shot  is 
inhibited  from  putting  out  another  pulse 
even  with  noise  on  the  line,  until  the  pulse  at 
pin  7  has  gone  away, 

The  period  of  the  incoming  line 
frequency  is  16,6  milliseconds.  The  RC  time 
constant  was  chosen  to  produce  a  pulse  at 
pin  6  equal  to  12  ms,  this  will  insure  that  the 


Fig,  2.  Schematic  of  the  display. 


Consequently,  if  we  can  develop  a  pulse 
precisely  2.4  seconds  long,  and  use  this  pulse 
to  let  dots  from  the  keyer  count-up  a 
counter,  then  display  the  contents  of  the 
counter,  we  will  have  accomplished  our  goaL 

A  block  diagram  of  the  code  speed 
display  unit  is  shown  in  Fig.l .  The  source  of 


1/4  MCI039 


""^""LP 


VEE 
GND 


+  4 


PIN 

I 
6 

16 


DTL/TTL 

VOLTAGE 

+  5 

0 


Fig,  3.  RTL  to  DTL/TTL  Converter. 


26 


73  MAGAZINE 


Top  view  of  the  code  speed  display  that  was  incorporated  into  the  author's  keyer. 


pulse  has  gone  away  by  the  time  the  next  ac 
line  cycle  appears.  The  shaper  therefore, 
puts  out  a  1  2  ms  pulse  for  each  cycle  of  the 
ac  line.  When  making  a  voltage  divider  for 
the  filament  transformer,  use  peak  voltage 
for  the  calculation  to  inusre  that  voltage 
peaks  at  the  shaper  input  never  exceeds  5 'V. 
The  pulses  on  pin  7  will  be  the  same  as  those 
on  pin  6  only  inverted  in  phase- 
Divider 

The  Fairchild  9305  IC  can  be  wired  to 
divide  by  various  numbers,  the  ICs  used  in 
this  application  are  wired  to  divide  by  12* 
Hence  two  such  circuits  divide  the  incoming 
line  frequency  by  144,  which  results  in  a 
pulse  at  pin  12  of  IC  UC"  each  2.4  seconds. 
This  pulse  train  goes  to  pin  1  of  Flip-Flop 
"N"  to  yield  a  pulse  at  pin  6  of  "N"  which  is 
positive  for  2,4  seconds  and  negative  for  2,4 
seconds.  The  same  inverted  sequence  appears 
at  pin  5  of  "N."  With  the  Hold  switch  open 
as  shown,  the  2.4  second  pulse  appears  at 
the  output  of  inverter  **FM  pin  1  2-  We  now 
have  the  2,4  second  gating  pulse  at  fc*P"  pin  3 
and  10.  With  the  switch  in  the  COUNT 
Position,  dots  from  the  keyer  pass  through 
the  gate  during  the  2.4  seconds  and  cause 
the  units  and  decode  counters  to  count  the 
dots.  The  number  contained  in  the  counters 
is  then  decoded  by  the  J  and  K  ICs  to  drive 


the  seven  segmented  display.  After  display- 
ing the  wpm  for  1.2  seconds,  the  counters 
are  reset  and  the  cycle  begins  over  again. 
Once  the  count  has  been  made  and 
displayed,  it  may  be  held  by  closing  the 
HOLD  switch.  With  the  HOLD  switch 
closed,  the  gating  pulse  and  reset  pulse  are 
blocked  and  the  display  remains  constant. 

Test 

This  circuit  contains  a  built  in  test  feature 
which  is  an  asset  for  those  who  lack  the 
necessary  test  equipment.  With  the  HOLD 
switch  open  and  the  MODE  switch  in  the 
TEST  position,  the  line  frequency  pulses 
from  single  shop  "E"  pin  10  are  steered  to 
the  counters  for  a  period  of  2.4  seconds. 
These  pulses  substitute  for  the  dots.  There 


E7 


CJZ 


J 


«*f2  ms 

n_rijxriji_rij^^ 

»I2  SEC 


2.4  SEC 


r 


P3 


F8 


PIS 


COUMT 


r 


-=L 


! 


■PRESET 


DOTS  I 


IIMIII) 


Fig.  4.  Timing. 


DECEMBER  1973 


27 


are  144  line  frequency  pulses  per  2.4 
seconds.  Therefore,  when  the  gate  is  enabled 
for  2.4  seconds,  144  pulses  will  enter  the 
counters.  The  counters  are  only  capable  of 
counting  up  to  99,  then  they  go  to  zero  and 
continue  to  count  incoming  pulses.  In  this 
case,  the  counters  will  overflow  and  display 
44.  Consequently,  a  count  of  44  in  the 
TEST  MODE  indicates  a  good  working  unit. 

Logic  Levels 

This  unit  is  made  up  of  TTL  and  DTL 
logic  families.  These  logic  families  require 
positive  (0  to  5V)  input  levels  with  a 
threshold  of  about  1;2V  when  the  logic 
switches.  Many  keyers  have  been  made  using 
the  RTL  logic  family.  If  your  keyer  is  of  this 
family  and  developes  pulses  which  go  from  0 
to  around  -3V  the  above  circuit  will  not 
work.  Don't  despair,  with  one  more  IC  the  0 
to  -3V  pulse  can  be  converted  to  a  respect- 
able 0  to  5V  pulse.  The  circuit  for  this  level 
conversion  is  shown  in  Fig.  3. 

Timing 

Fig.  4  gives  all  the  timing  for  the  code 
speed  display  unit.  The  reset  pulse  comes 
just  before  the  count  begins.  Evidence  of  the 
reset  pulse  can  be  seen  since  it  blanks  the 
displays  during  the  reset  period. 

Power  Supply 

A  word  of  caution  to  those  who  would 
rob  power  from  their  keyer  to  power  the 
code  speed  display  unit.  This  circuit  requires 
400  mA  at  5V,  so  make  sure  your  existing 
supply  can  handle  this  new  load.  If  it  can't, 
you   can    build   the  one  shown  in  Fig.   5. 

Operation 

The  best  way  to  set  your  desired  code 
speed    is    to    adjust    the    speed    with    the 


60  Hz 


IN400I  (4) 

50  PRV 

I   AMP 


VAC     j— h4 


INPUT 


63  VOLTS 
AT  2  AMPS 


(2)  1000  vf 
15  V 


OUTPUT 


FA1RCHILD 

uA7805 

VOLTAGE 

REGULATOR 


5V 


COMMON  - 


<«>    JLULLLUULUL 


(b) 


Fig.  5.  5  Volt  Power  Supply. 


(c) 


Fig.  6.  Gating  Error, 

transmitter  off  (no  rf )  then  switch  to  HOLD 
and  continuously  display  the  wpm  until  you 
want  to  make  another  code  speed  change. 

One  thing  to  remember  when  using  digital 
counters,  whether  it  be  this  one  or  a 
frequency  counter,  is  that  the  least 
significant  bit  may  be  incorrect  by  one  unit. 
Since  the  opening  and  closing  of  the  count 
gate  is  rarely  synchronized  with  the  dots 
passing  through  the  gate,  there  always  exists 
a  ±  1  count  gating  error.  In  Fig.  6,  line  (c) 
represents  the  opening  of  the  signal  gate.  If 
the  phase  relationship  of  the  incoming  dots 
with  respect  to  the  gate  is  as  shown  in  (a), 
six  pulses  will  be  counted.  If,  however,  the 
phase  relation  is  as  shown  in  (b)  only  five 
pulses  will  get  through  the  open  count  gate. 
If  the  dots  from  your  keyer  were  derived 
from  the  line  frequency,  this  would  not 
occur. 

Conclusion 

Although  a  specific  design  was  presented, 
the  main  objective  was  to  present  a  way  of 
measuring  and  displaying  code  speed.  It  is 
not  important  to  use  the  same  IC's  as 
presented  here  to  arrive  at  the  same  results. 
Any  ICs  may  be  used  that  can  fulfill  the 
requirements  of  the  block  diagram.  All  ICs 
and  display  units  to  implement  the  block 
diagram  are  available  from  advertisers  in  this 
magazine. 

No  specific  information  was  given  regard- 
ing the  lighted  display  units,  because  each 
type  has  its  own  connection  outline.  It  is 
only  required  that  "a"  thru  "gM  of  the 
SN7447A  go  to  the  corresponding  segments 
of  your  choosen  display  unit. 

The  photos  show  additional  circuitry  l!o 
that  described  here,  that  is  because  I  incor- 
porated the  keyer.  I  also  took  advantage  of 
the  2.4  second  pulse  and  divided  it  down  to 
make  a  10  minute  timer. 

...VE1BU/W3 


28 


73  MAGAZINE 


Ralph  W.  Campbell  W4KAE 
316  Mariemont  Drive 
Lexington  KY  40505 


? 


KILOWATT 

LINEAR 
AMPLIFIER 


The  5-5QQA  plate 
line  is  a  Mylar  wrap- 
ped "sandwich  **  of 
sil  v  e  r-pla  ted  brass 
sheet  metal  and 
bronze  foil.  By 
u&ng  dual  plate  line 
construction, 
inductance  is  halved 
and  skin-effect 
reduced.  The 
aluminum  angle  case 
structure  is  part  if 
the  rf  output 
circuit!  A  stub  and 
90  high  power 
quadrature  coupler 
must  be  used  to 
separate  chassis 
ground  from  output 
' §  ground'9  on 
ca  hies. 


Wanting  a  full  kilowatt  linear  ampli- 
fier for  two  meter  moonbounce 
attempts  prompted  me  to  construct  the  unit 
described.  It  is  a  linear  built  around  the 
Eirnac  5-500A  pentode,  with  special  tuning 
and  mechanical  features  to  allow  safe  opera- 
tion above  110  MHz,  Both  transverse  and 
bottom  seal  cooling  is  employed;  however, 
for  IVS  or  double  sideband,  only  natural  seal 
cooling  is  necessary  -  with  the  exception  of 
the  plate  seal  which  must  always  be  blown. 
I  must  admit  I  had  difficulty  keeping  a 
good  tube  going  within  the  linear  because  of 
high-duty   factor  operation,  LeM  AM  linear 


DECEMBER  1973 


29 


POWER  WIRING 
RF  SECTION 


16  MM  DUAL  COPPER-BRONZE 
STRAP- 22  CM  LONG 


FANS 

BOCFM 


100  CFM 
"SKIPPER" 


t    +   /    i  <  *  *    '    f    f    "    f    f    *\     2( 

I  R-^V1A  I  '       / 


R.FIN 


OMNI- 
GLOW 
PILOT 


6N0(j) 


1/2  EFJ 
167-22 


500  PF 
20KV 


REMOTE 

POWER 

II 
+5CREEN 


a^X 


(4)  400  PIV 


II  PIN 
RELAY  SOCKET 


■-I33V 


/77450V 


U=3  1/2  TOF  4  MM  STRAP 

ON  12  MM  DIA  CER.  FORM 


TWOER 
POWER 
XFMR 


RFOUT 
SO-239 


t  EFJ   154-11 
9-38  PF 


FiqA*    Schematic    of    the    1    kW   2   meter  amplifier.    Refer   to   the  photographs  for  component 
placement. 


and  slow  CW,  and  it  was  necessary  to 
purchase  an  extra  tube  while  experimenting. 
The  first  tube  failed  externally  by  arcing 
within  the  5-500A  base/shell,  but  there  was 
no  internal  damage.  After  this  I  tried  increas- 
ing the  airspace  around  the  socket  (there  was 
no  room  for  an  air  system  socket)  and 
installation  of  a  ''whoosh- type"  muffin  fan 
blower  on  the  bottom  cover,  directed  at  the 
socket.  This  last  arrangement  is  the  most 
satisfactory  for  AM  linear  operation. 

The  basic  electrical  design  is  similar  to 
conventional  tetrode  linears,  with  the  excep- 
tion that  an  extra  grid  —  a  suppressor  —  is 
employed  in  the  tube  design.  This  grid  is 
attached  to  the  outer  mounting  shell/rim  of 
the  tube  base  and  is  grounded  by  an  Amper- 
ex  UHF  plate  type  connector.  Input  circuit 
design  utilizes  an  "inductive"  divider,  which 
means  it  is  a  series  tuned  network  in  parallel 
with  the  input  coaxial  connector  jack;  how- 
ever, the  divider  action  is  a  result  of  tapping 
total  series  grid  inductance  similar  to  an  rf 


autotransformer.   In  the  theory   section  we 
shall  describe  this  further. 

Choice  of  a  pentode  for  VHF  linear 
service  was  the  result  of  an  original  htudy  I 
made  into  the  shortcomings  of  beam  tet- 
rodes on  VHF:  There  seemed  to  be  so  many 
reasons  why  a  tetrode  rig  could  be  unstable, 
or  need  neutralization  or  suffer  from  secon- 
dary emission,  that  1  gave  up  long  ago  on 
these  tubes  for  ordinary  50  or  145  MHz 
operation.  On  500  MHz  or  432,  the  4CX- 
series  of  tubes  are  excellent.  A  better  VHF 
ceramic  pentode  is  the  5CX1500,  but  I 
didn't  have  the  money  to  experiment  with 
this  tube. 

Although  I  was  not  successful  in  working 
moonbounce  with  the  linear  described,  it 
was  operated  during  an  ARRL  VHF  QSO 
Party  with  excellent  reports! 

Theory 

Graphs  describing  operation  for  a  particu- 
lar  operating   class   are    not    provided    here 


30 


73  MAGAZINE 


Under  chassis  view 
of  the  Amplifier. 
Screen  bypass 
capacitors  must  be 
silver  mica,  or  rf  will 
eat  'em  up  in 
seconds!  It  may  be 
hard  to  find  these 
rated  to  1Q0QV,  but 
they  are  available  as 
CMQ7  types.  Induc- 
tive divider  input 
circuit  is  used,  with 
slug  removed  from 
form.  Tube  base  and 

w 

socket  pins  should 
be  separately  blown 
by  muffin  fan  from 
bottom     for     high 

duty  operation. 


because  it  would  make  the  text  too  long. 
However,  those  wishing  to  do  an  analysis  are 
directed  to  do  so  with  the  Eimac  tube 
performance  counter,  as  supplied  with  their 
text:  "The  Care  and  Feeding  of  Power  Grid 
Tubes,  "  I  have  already  done  such  an  analysis 
on  a  pair  of  PL-1 77WA V  The  class  of 
operation  here  is  ABi.  depending  upon  how 
hard    the    unit    is    driven    and    how    much 


C=  125  MFD/450V  (FP-J55A) 

D={4)MZS(MALLDRY) 
KX>0P1V  RECT 

TRIAD  PSA  R£=CK/lOW/ttW 

1255  VCT 


12  AMP 
BREAKER 


N5VAC 


II  PW 
RELAY  SOCKET 


(4) 

IN30I4B 


distortion   is   tolerable.   A  set   of  operating 
parameters  is  enclosed  as  a  reference. 

5-500A  Specifications 

Plate  Volts  4000  (3000) 

Plate  Current 

Plate  Diss. 

Screen  Diss- 

Drive  Power 

Filament 

Screen 


Fig.  2.  Power  supply  for  the  2  meter  amplifier. 


0.45  (0.33) 

500 

35(16) 

7  (5 1 estimated ]  ) 

I0V/10A 

750  (600) 

As  can  be  easily  seen,  our  5-500A  was 
operated  well  within  its  maximum  ratings, 
noting  that  the  maximum  voltages  and  cur- 
rents are  at  the  left  in  each  column  and 
parentheses  contain  our  figures.  Bias,  of 
course,  is  very  important.  We  run  about  -133 
fixed  bias  plus  -33  zener  bias  off  the 
centertap  of  the  filament  transformer,  for 
about  -165V  or  so  totaL  There  must  be  some 
grid  current  drawn,  also,  but  it  is  very  slight 
and  impossible  to  measure  bias  attributed  to 
it  under  key-down  conditions.  My  TX-62 
will  drive  the  5-50QA  to  its  highest  power- 
Screen  current  is  10  mA  or  less,  which  is  a 
conservative  value.  High  circulating  rf  cur- 
rents have  been  responsible  for  some  of  our 
troubles  —  high  enough  to  melt  the  solder 
tabs  even  when  the  whole  arrangement  is 
transverse  blown. 

A  limiting  factor  in  VHF  design  is  the 
high  output  capacity.  On  2,  it  is  necessary  to 
series  tune  the  plate  tank,  thereby  providing 
an  rf  plate  current  maxima  at  the  point 
where  the  strap  comes  closest  to  the  sup- 


DECEMBER  1973 


31 


— 


GATEWAY 

ELECTRONICS 

8123-25  PAGE    BOULEVARD 

ST.    LOUIS,   MISSOURI   63130 

(314)   427-6116 


MAIM  1-  Type  7  Segment 
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socket,  size,  etc.  as  MAN  1 

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STANDARD  SIZE  -  0.5  x  2.125  x  1.78 
10  position  decimal  $3.00 

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MINIATURE  SIZE  -     0.312  x  1.3  x  1,3 

10  position  decimal  S2.50 
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porting  structure.  This  is  the  precise  point 
where  a  blocking/coupling  capacitor  is  in- 
stalled. The  strap  consists  of  both  the  teflon 

sandwich  and  stator  capacitor  blades  and  the 
plate  lead-length  inside  the  tube  as  well. 
Another  factor  that  can  be  limiting  in  the 
usual  designs  is  the  input  capacity.  Not  here, 
however! 

Power  output  of  the  1  kW  2m  linear  is  up 
to  five  times  that  of  our  reliable  PL- 
177WA*s,  operated  in  parallel.  We're  getting 
500W  on  our  diode  indicator,  which  was 
checked  against  a  Bird  Thru-Line  Directional 
Wattmeter.  The  way  this  indicator  (using  a 
hot-carrier  diode)  was  calibrated,  under 
matched  conditions,  is  this:  With  the  177's 
having  a  measured  output  of  100W  rf,  the 
diode  indicator  was  placed  in  series  and  the 
meter  reading  noticed.  Then,  1  wrote  down 
20  out  of  a  full  scale  value  of  50  units.  With 
the  bigger  5-500A  linear  and  the  exact  same 
load  in-circuit,  the  reading  was  45  units  most 
of  the  time  and  50  units  (and  slightly  off 
scale)  when  there  was  higher  ac  line  voltage, 
as  in  the  afternoon  for  instance. 

Construction 

The  1  kW  2m  linear  is  built  in  a  Bud 
Converta-Box  chassis,  Plexiglas  is  used  for 
safety -of -life  considerations,  since  metallic 
screening  on  only  the  front  apron  can  be 
tolerated.  Seems  there's  a  cavity  type  rf 
mode  within  the  enclosure,  which  can  be 
quickly  destroyed  by  placing  any  metallic 
screening  on  the  other  surfaces.  The  P-6461 
Stancor  filament  transformer  is  mounted  on 
the  Converta-Box  and  not  in  the  separate 
power  supply ,  Also,  there's  the  Barber- 
Coleman  transverse  cooling  fan  adjacent  to 
it.  An  air  system  socket  would  have  been 
used  had  Eimac  thought  to  provide  a  suit- 
able grounding  strap  on  the  SK-400.  Separa- 
tion was  added  later,  to  permit  adequate  air 
flow  for  cooling  the  base  seals.  The  transfor- 
mer next  to  the  fan  is  a  Heathkit  "Twoer" 
power  transformer  used  in  the  bias  supply. 
The  coaxial  HV  jack  is  rated  to  5  kV  and  is 
featured  for  greater  safety  as  well  as  a  good 
ground  between  the  supply  and  top  deck  of 
the  box.  A  second  ground  is  provided  by 
means  of  a  banana-jack  plug  next  to  the  1 1 
pin  relay  socket  which  supplies  low  voltage, 
power  and  screen  voltage  to  the  unit. 


32 


73  MAGAZINE 


Ambient  light  side  view.  Open  case  partitions  are 
covered  with  Plexiglas,  to  prevent  improper  loading 
which  would  result  with  screening.  Top  channel 
cannot  be  "grounded"  to  lower  chassis  without 
loss  of  several  hundred  watts  of  output  power m 
Amperex  S-3706  suppressor  ground  connector  is 
visible.  Entire  unit  is  built  upon  large  Bud 
Converta-Box .  Angle  plug  was  replaced  with  Tee 
connector  for  addition  of  stub. 

A  Sprague  20DKT5  500  pF/20  kV 
ceramic  coupling  capcitor  is  mounted  upon 
the  sandwiched  teflon  plate  line.  At  the 
point  where  the  screw  secures  the  "door- 
knob" to  the  fine  there  is  a  juncture  between 
the  split-silver  plated  bronze  (to  the  left)  and 
the  heavier  soft  brass  dog-leg  down  to  the 

EJF  type  154-11  "E"  capacitor.  This  vari- 
able has  a  range  of  9  to  38  pF,  which  is  just 
right  to  tune  different  variations  in  tube 
output  capacities  with  the  sandwich  strap. 
The  strap  is  a  high  efficiency  54  wavelength 
tuned  line,  and  not  Vi  wave.  Even  so  there  is 
a  "cavity  effect"  within  the  enclosure. 

The  front  apron  controls  are:  Input,  Grid, 
Quiescent  Cathode  Current,  30000V  (neon 
lamp  pilot),  ON/OFF  and  Fuse.  The  input 
connector  is  <an  Amphenol  UG-1094/U  and 
the  "grid"  control  is  an  EFJ  butterly  "L" 
capacitor,  type  167-22,  Only  one  half  sec- 
tion is  used.  The  cathode  meter  is  an  Emico 
Edgewise  500  mA  plastic  encased  economy 
model.  The  ON/OFF  switch  is  a  Cutler- 
Hammer   industrial   3-pole  job   with  a  high 


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Also  $25,000  inventory  used  gear.  Request 
list.  Chuck,  W8UCG. 

ELECTRONIC  DISTRIBUTORS,  INC 

I960  Peck  Muskegon,  Ml  49441 

Tel.(616)-726-3198 

TELEX:  228-411 


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ELECTRONICS,   INC 

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Frequency   Standards 

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DECEMBER  1973 


33 


DRAKE   •   REGENCY  •   HALUCRAFTERS 

ANT    SPEC     *   S8E 

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Departments  28 

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PHONE  -  (305)  686-8563 


THE  "TO  EVERYTHING"  Th  AMP,  1000  VOLT  OlODE 
Mo  km  all  is  catching  up  on  the  backlog  and  we've  goi  Thousands 
Of  them  back  m  stock.  1D/S3  00  -  100^25  00 


DQCM] 


THE  MOST  POPULAR  DUAL  GATE  PROTECTED  M0$  FET 

around,  fiSod  to  over  400  MHZ,  We  goX'm  and  you  get  em 
for  only    ., 5/S6.00 


POTTER  BRUMFIELD 
MINI 


Only  52  00  each  -  3/S5.50  Min  or  Match. 


Meawm  only  *  *  T  x  %%".  PtastJc  cased    L*k*  KNP  type. 
For  pc  board  or  wjckai.  14  fuos.  1-3/32  s.tud  too1  Both  4P0T 
All    ceramic    construction     3   amps,    contacts.   Fc*   r*f  ant, 
twitcfitng.  WL    1-oz,  Vfimmvtt  space  n  prim*,  you  need  a 
mini  cap"  rdav 

115  VACMcp* 

24  VDC 


#?G  -  174/U 


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hevu  cci mi*  in  from  ihtj  factory.  Split  a  500'  spool  with  a  friend 
and  llVf SSSSS 
BELDEN  NO.  8211  1007$4„8Q  -  5D0VST7.85 


LED  Readouts 


. 

SIZE 

COLOR 

DECIMAL 

EACH 

SPECIAL 

OPCOA  SLA-1       ,33 

Red 

Yes 

2.95 

4/sn 

OPCOA  SLA  1TC  ,33 

Green 

Yes 

4.95 

4/sie 

OPCOA  SLA  3H    .70 

Red 

Yet 

7,95 

4/52B 

All  use  7447  Dnvert  Spec*  included. 


Wfl  did  it  again  All  brand  new  with  standard  markings  and 
mofct  were  manufactured  this  year.  A  rnojof  manufacturer 
dropped   his   RF    power   line  and   we    bought   his  inventory. 


2N5589 
2N5590 
2N559I 
7N6O80 
2f*608t 
2N6082 
7N6083 
2N6084 


3  Waits  Out 
10  Watts  Out 
25  Watir.  Qui 

4  Waits  Ou  i 
15  Warn  Out 
25  Watt*  Out 
30  Watts  Out 
40  Watt*  Out 


s 


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12-00 

5.00 

750 

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1200 

15.00 


All  are  Silicon  NPN  and  power  output  ratmgs  are  good  to 
1 75  MHZ,  HuTfv  som*  Quantities  ate  Iwniled 

KE 


G  10  Glass  Epoxy 

Parf  Board  3/64"  Thick. 


0    £   $y  q] 

<&  A  0-  Q   0 
^y.  -q>  <p.  -^J>  <|> 


^  ^^  ty  0 


No                                               Size  I  in  J  Price 
UNCLAD- 

4229  7x4%  S     .85 

4230  2*6  109 

4231  «B  1  S5 

4237  17  a  fi  5.75 
COPPER  CLAD  ONE  SIDE — 

4238  2»4  I  35 
4739  -6  1.85 
4240  4%  *  6  3  70 
4741                                              17 * 6  fi 70 

_         **  GUARANTEE  WHAT  WE  SELL! I H 

W*  ship    UPS   n*irtw*r   pOttlfcl*,    Give  Hrwf   iiMhil   Include 
<mcwp*i  tor  pE»1aga„  HKORl  rounded  <n  Cilh,  Flacida  i*ndflmt 

includ*  4%  Tin . 


current  rating,  The  fuse  is  a  2  A  Slo-Blo.  The 
underside  of  the  chassis  shows  routine  com- 
ponents, a  bridge  rectifier  plus  filter  and 
sockets. 

The  high  voltage  power  supply  is  housed 
in  a  separate  container.  We  chose  a  standard 
Par-Metal  amplifier  foundation  measuring  6 
x  14x3  (inches).  Topside  there's  the  Triad 
P-9A  1235V  CT  power  transformer,  some 
teflon  "zener  sink"  stud  cups,  and  an  exten- 
sive bank  of  Mallory  electrolyties.  Each 
electrolytic  is  mounted  separately  with  its 
own  100K/2W  voltage  equalizing  resistor 
and  ceramic  posts  which  are  bolted  to  the 
chassis  proper.  Oversize  holes  are  drilled  in 
the  foundation  to  give  high  voltage  lead 
clearance  therethrough.  The  zener  sink  cups 
are  actually  portions  of  teflon  C-cell  battery 
tubing  that  have  been  cut  off  about  1  cm 
high,  then  they  are  filled  with  Wakefield 
type  142  thermal  epoxy  to  make  a  good  sink 
to  chassis  when  the  resin  is  cured.  I  tried  the 
mica-insert -stud  method  of  sinking  the 
zeners,  but  when  you  series  as  many  as  four 
150V  units,  the  insulation  is  insufficient. 
The  solution  to  the  problem  was  to  insulate 
the  studs  with  fiber  shoulder  washers  and 
encapsulate  as  shown.  Only  one  P9A  power 
transformer  is  shown  for  1VS  service.  Two 
are  necessary  for  AM  linear  and  prolonged 
CW  uses. 


Closeup  of  earlier  coupling  arrangement,  discarded 
because  of  rf  arcing  through  teflon  insulation  and 
shrinktubing*  W&  had  to  change  different  output 
scheme  to  make  it  work  properly.  On  14S  MHz  a 
strap  is  a  "tuned"  circuit  with  5-500A  (high) 
output  capacity.  Ordy  about  300  W  output  with 
type  loading.  Current  maximum  must  occur  at 
output  coupling  point  Inductive  coupling  like  this 
is  no  good. 


34 


73  MAGAZINE 


An  underchassis  view  of  the  power  supply 
shows  the  Vectorboard  silicon  rectifier  wir- 
ing and  connections  to  the  transformer  leads 
and  relay  socket,  A  12A  circuit  breaker  is 
shown  on  the  left.  Sixteen  Mallory  M2,5 
rectifiers  are  cascaded  in  rows  of  four  each, 

for  higher  PIV.  No  equalizing  resistors  or 
capacitors  are  necessary  on  these  devices 
since  they  are  avalanche  rectifiers,  rated  at  1 
kV/2-5A  each!  There  is  another  Emico 
meter  shown,  which  used  to  measure  the 
voltage  drop  across  the  10K  series  droppers, 
but  this  was  abandoned  when  the  knee  of 
the  series-string  resulted  in  the  right  screen 
voltage.  A  series  M2.5  rectifier  is  used  as  a 
polarity  sensitive  switch,  to  prevent  tube 
failures  that  result  in  destruction  of  the 
zener  supply  A  high  voltage  buffer  capacitor 
is  used  across  the  screen  regulator  circuit  to 
prevent  transients  from  blowing  these  de- 
vices. 

Adjustment 

This  linear  isn't  really  tricky  to  use.  All 
that's  necessary  is  to  have  some  kind  of 
indicator  attached  to  the  output  connector 
(an  swr  bridge  is  fine  here)  and  adjust  the 
grid  for  a  resonant  peak  and  resulting  in- 
crease in  plate  current.  There  should  also  be 
a  resulting  increase  in  signal  output.  If  plate 
current  rises  too  high,  meaning  an  out-of- 
resonance  tank,  reduce  the  driver  power  to 
allow  resonance  to  be  reached  without 
damage  to  the  tube.  By  peaking  the  plate 
tank  for  highest  output,  which  may  or  may 
not  accompany  a  dip  in  line  current,  proper 
operation  is  achieved.  A  dummy  load  should 
be  connected  at  all  times. 

The  adjustments  mentioned  above  should 
be  repeated  until  maximum  output  readings 
are  obtained.  If  a  Heath  Cantenna  is  used  for 
a  load,  it  should  be  operated  for  only  a  few 
minutes  becuase  of  high  rf  output.  A  quick 
check  should  be  made  after  these  adjust- 
ments to  ensure  screen  current  and  plate 
current  meters  are  indicating  safe  values.  Of 
course  the  best  way  to  get  an  overall  picture 
is  to  look  at  the  500W  anode  -  if  it  is 
glowing  a  dully  cheery  red,  you're  probably 
all  okay. 

The  external  stub  shown  is  a  necessity  for 
a  perfect  match  on  two  meters,  although 
there   may  be  some  installations  that  don't 


2KW  power  supply  for  the  Linear.  Four  WW  stud 
mounted  zeners  are  cooled  by  pools  of  cured 
Wakefield  thermal  epoxy,  which  is  applied  to  the 
chassis.  Electrolytics  are  mounted  on  3/8th  inch 
ceramic  posts  for  high  voltage  insulation.  Two 
Triad  P9A  plate  transformers  are  necessary  for  CW 
or  AM  linear  operation,  although,  the  one  shown 
here     will     do     for    SSB     or     DSB    service. 


require  it.  This  is  made  from  a  piece  of 
open-circuited  RG-8/U  cable,  exactly  21.60 
cm  long  -  from  the  back  shoulder  of  a 
PL-259  plug  —  to  the  open  end,  The  purpose 
of  the  stub  is  not  to  eliminate  standing 
waves  on  the  outside  of  the  cable;  rather  it  is 
for  matching  impedance  of  the  inner  con- 
ductor to  resonant  plate  load  impedance  of 
the  tube. 

Conclusion 

The  5-500A  linear  amplifer,  or  "1  kW  2m 
Linear,"  is  a  big  help  on  2.  With  up  to  500W 
output  from  a  mere  grid  drive  of  about  5W, 
is  20  dB  gain  that  any  transmitter  can 
use  —  especially  when  the  band  is  less  active 
during  low-bending  VHF  activity  (the  iono- 
sphere does  affect  stratospheric  bending).  I 
have  had  no  more  problems  with  Hi-Fi 
interference  than  with  the  TX-62  that  drives 
it,  so  once  you  alleviate  problems  caused  by 
the  TX-62  you  should  have  no  further 
difficulty  operating  this  equipment! 

.  .  .W4KAE 


DECEMBER  1973 


35 


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SIM 


YER 


Here  is  an  electronic  keyer  that  features 
self-completing,  built-in  monitor  and 
instant  start.  The  bulk  of  the  circuit  is 
straightforward,  using  gating  and  flip-flop 
functions  to  generate  dots  and  dashes.  The 
really  unique  aspect  of  the  keyer  is  the  gated 
clock. 

The  gating  action  of  the  clock  must 
operate  in  the  following  sequence.  The  clock 
is  enabled  by  either  the  paddle  or  the  output 
which    is   the    method    of   self   completing. 


When  the  output  goes  low  after  the  comple- 
tion of  a  dot  or  dash  and  the  paddle  is  not 
depressed  the  clock  is  disabled,  and  must 
remain  disabled  for  at  least  one  dot  time 
duration,  after  which  it  should  be  able  to 
start  on  demand.  This  provides  a  minimum 
spacing  between  dots  and  dashes  regardless 
of  the  motion  of  the  paddle, 

The  oscillator  uses  a  SN7413  Schmitt 
trigger  as  a  relaxation  oscillator.  Typical 
waveforms  appear  in  Fig.  2, 


ioon 


8-45J1 


Fig.    1 .  Schematic  diagram  of  the  keyer. 


DECEMBER  1973 


37 


6V 


BV 


B 


/ 

\  A 

\  A 

\ 

V 

V 

\ 

i — 

Fig.  2.  Relaxation  oscillator  and  associated  wave* 
forms. 


These  criteria  require  a  control  signal  to 
disable  the  clock,  prevent  any  negative  tran- 
sition for  one  dot  duration  and  then  be 
ready    on   demand.    The   circuit    in    Fig.    3 

accomplishes   this   function   with   the   mini- 
mum components. 

When  the  control  line  is  low  the  circuii 
oscillates  normally.  When  the  control  line 
goes  high,  which  in  the  keyer  coincides  with 
the  negative  transition  of  the  clock,  the 
diodes  conduct  and  the  capacitor  voltage 
quickly  discharges  from  1.6  to  about  1.5  V, 
which  is  the  sum  of  the  "0"  output  voltage 
of  the  gate  and   the  two  ,7V  diode  drops. 


B 


r 

i 
j 


Fig.   3,    Control  circuit  for  the  clock. 

The  capacitor  continues  to  discharge  at  the 
usual  rate  until  it  reaches  the  SN7413's 
threshold  of  .8V,  when  the  gate  changes 
state  and  the  capacitor  voltage  heads  up 
again.  The  capacitor  charges  up  to  1 .5V  and 

becomes  clamped  by  the  diodes.  The  oscil- 
lator is  now  ready  for  operation.  When  the 
control  line  goes  low  the  capacitor  can  now 
charge  up  100  mV  to  the  threshold  and 
begin  oscillation. 

The  oscillation  is  not  "instant"  start,  but 
"fast"  start.  Approximately  10%  of  a  dot 
duration  is  required  for  start-up. 

The  unit  is  easy  to  build  and  careful 
shopping  for  surplus  components  can  place 
the  cost  below  $10.00  for  everything,  in- 
cluding cabinet  and  power  supply. 

..  .K2BLA 


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38 


73  MAGAZINE 


YOUR  ASSURANCE  OF  PERFORMANCE  &  QUALITY 


Amateur  Price  Net 
Subject  to  Change 


ITS  HERE  NOW  The  NEW  FT101B 


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Amateurs  and  Maritime  operators  around  the  world  have  discovered  the  FT1.01  a 
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THE  FM  LEADER  IN  2  METER  AND  6  METER... AND  NOW  220  MHz 


This  article  describes  a  compact  signal 
generator  that  simultaneously  outputs 

square,  triangular,  plus,  unlike  others,  sine 
waves  in  the  frequency  range  of  0.05  Hz  to  1 
MHz.  Although  the  author's  unit  is  a  signal 
generator,  it  can  be  used  as  a  frequency 
modulator  or  voltage  controlled  oscillator 
with  only  minor  circuit  modifications. 

The  signal  generator  utilizes  the  advanced 
Intersil  8038  monolithic  chip  which  fea- 
tures: 

•  simultaneous  sine,  square  and  triangu- 
lar wave  outputs 

•  low  distortion  (1%) 

•  high  linearity  (0.1%) 

•  wide  frequency  variation  C001  Hz  to 
1  MHz) 

•  variable  duty  cycle  (2%  to  98%) 

Typical  amateur  applications  for  this 
waveform  generator  are: 

•  RTTY  AFSK  Keyer 

•  FM  modulator 

•  voltage  controlled  oscillator 

•  signal  generator 

Signal  Generator  Circuit 

The  heart  of  the  signal  generator  is  the 
Intersil!  8038  waveform  generator.  The  sche- 
matic diagram  of  Fig.  1,  shows  the  author's 
circuit  of  a  signal  generator.  This  circuit 
consists  of  the  waveform  generator,  timing 
capacitors  and  potentiomenters,  and  a  dc 
coupled  buffer  amplifier.  This  amplifier  is 
switched  to  the  desired  wave  shape  output- 
Three  dedicated  buffer  amplifiers  and  out- 
put terminals  may  be  used  for  additional 
flexibility. 

Components 

The  timing  capacitors  CI  to  C8  should  be 
high  Q,  low  tolerance  components  where 
possible,  These  capacitors  determine  the 
frequency  decades  of  the  signal  generator, 
Rl  serves  for  frequency  tuning  within  each 
range,  R2  determines  the  frequency  coverage 
of  Rl,  R3  and  R4  limit  the  upper  frequency 
of  the  ranges.  A  good  quality  linear  taper 
potentiomenter  with  at  least  270°  taper 
function  should  be  used  for  RK  Using  a 
linear  potentiometer  for  Rl  the  dial  scale 
will  be  semi-logarithmic. 


H.  P,  Fisher  VE3GSP 
1379  Forest  Glade  Rd, 
Oakvilte  Ontario  CA 


PRECISION 
WAVEFORM 

ERATOR 


JTJ" 

A/V 


All    this   from    a    single    IC! 


With  the  resistor  and  capacitor  values  as 
listed,  the  following  frequency  ranges  are 
covered  (Rl,  R2,  R3  and  R4  are  adjusted  to 
give  a  600  to  6000  Ohm  tuning  range): 


Capacitor 

CI,  500 nF 
C2,  50  juF 
C3,  55  mF 
C4,  .5  AlF 
C5,  .05  /xF 
C6,  .005  juF 
C7,  500  pF 
C8,  250  pF 


Frequency  Coverage 

.05  Hz  -  .5  Hz 

.5  Hz  —  5  Hz 

5  Hz  -  50  Hz 

50  Hz -500  Hz 

500  Hz  -  5  kHz 

5  kHz-  50  kHz 

50  kHz  -  500  kHz 

100  kHz  -  1  MHz 


If  different  values  of  capacitors  or  resis- 
tors are  more  convenient,  the  resulting  fre- 
quency for  different  RC  values  may  be 
calculated  from  the  following  formula: 


DECEMBER  1973 


41 


(WAVEFORM   GENERATOR) 
Rt    IOK 

5>IAM-Rf      | -pfi&- — 

R2   ZOK 


R3 
500 


+  V, 


££ O  f2  V 


(EQUALIZER    ATTEN  ) 


(BUFFER    AMPLIFIER) 


+  12  V 
0 


O  SIGNAL  OUT 


CI  -C8    (SEE    TEXT) 


Fig.  1.  Schematic  of  the  triple-wave  output  signal  generator. 


r^  150,000 
h  RxC 


C  is  the  timing  capacitor  in  /iF  and  R  is 
the  total  resistance  between  +VCC  and 
terminals  4  +  5  in  Ohms. 

The  permissable  resistance  values  between 

terminals  4,  5  and  +VCC  range  from  250il 
to  500kfi.  The  permissable  supply  voltage 

may  vary  from  ±5V  to  ±15Vand  preferably 
should  be  regulated.  A  single  supply  of +10 
to  +30 V  may  be  used,  but  it  is  then 
advisable  to  decouple  the  output  with  a 
capacitor  because  of  the  large  dc  offset 
voltage.  This  will  likely  cut  down  on  square 
wave  and  low  frequency  response. 


? 


SWEEP 
VOLTAGE 


°  +  Vcc 


o  JT-TL 
o  AA/ 
o  W 


O— V 


Fig.  2.  Sweep  circuit  and  voltage  controlled 
oscillator, 


The  sine,  square  and  triangular  wave 
outputs  at  chip  pins  2,  9  and  3  have 
different  output  levels.  These  levels  are, 
(with  a  lOOkO  load  resistor),  0.9  x  Vs  for 
the  square  wave,  0,3  x  Vs  for  the  triangular 
wave  and  0.2  x  Vs  for  the  sine  wave  signal. 
(Vs  -  total  supply  voltage).  Thus,  with  24V 
supply  voltage,  the  available  output  levels 
are  21V  peak  to  peak  (square  wave),  7.5V 
peak  to  peak  (triangular  wave)  and  5V  peak 
to  peak  (sine  wave).  The  square  wave  and 
triangular  wave  outputs  are  therefore  attenu- 
ated to  the  same  level  as  the  sine  wave 
output  before  going  into  the  buffer 
amplifier. 

Buffer  Amplifier 

A  simple  buffer  amplifier  is  shown  in  Fig. 
1  i  The  resistor  dividers  provide  equal  signal 
levels  to  Tl  and  reduce  the  loading  effect  of 
the  low  base  input  impedance.  Tl  is  a 
2N3709  high  gain  amplifier  transistor  which 
is  wired  as  an  emitter  follower  to  provide  a 
lower  output  impedance  than  the  8038  chip. 
The  signal  level  for  all  waveshapes  at  ±12V 
supply  voltage  is  approximately  5V  peak  to 
peak. 


42 


73  MAGAZINE 


CIRCUIT  ALTERNATIVES 
AFSK  Generator 

Because  of  it*s  high  stability  and  low 
distortion  the  sine  wave  output  is  perfect  for 
RTTY  audio  shift  frequency  keying.  Two 
jnethods  of  frequency  shifting  are  possible 
with  this  unit.  The  value  of  the  frequency 
determining  resistor  may  be  switched,  or  a 
frequency  shift  voltage  may  be  introduced 
to  terminal  8  as  indicated  in  Fig.  2.  If  the 
first  of  the  two  methods  is  used,  typical 
values  of  Cf  and  Rf  are  (with  Cf  =  .033  juF): 

Rf  =  3135  £2 

f  =  1450  Hz  mark  frequency 
Rf=  2806  12 

f=  1620  Hz  (170  Hz  shift) 
Rf=  1976  n 

f  =  2300  Hz  (850  Hz  shift) 

Frequency  Modulator 

Fig.  3,  shows  a  typical  schematic  for 
narrow  band  frequency  modulation.  The 
frequency  of  the  waveform  generator  is  a 
direct  function  of  the  dc  voltage  at  terminal 
8,  measured  from  +VCC  By  altering  this 
voltage,  frequency  modulation  is  perforrned- 

For  small  deviations  of  (e.g.  10%)  the 
modulating  signal  can  be  supplied  to  pin  8 
through  a  decoupling  capacitor.  An  external 
resistor  between  pin  7  and  8  is  not  necessary 
but  can  be  used  to  increase  the  input 
impedance,  which  then  increases  from  8k£2 

to  8kfi  +  R. 

For  larger  FM  deviations  or  frequency 
sweeping,  the  modulating  voltage  is  applied 
between  the  positive  supply  voltage  and  pin 
8.  A  1000:1  sweep  range  can  be  achieved 
with  a  change  of  f  =  0  at  V  sweep  =  OV\  The 
potential  at  pin  8  may  not  exceed  2/3  of 
+VCC 


eg,  250  K 


o+v 


cc 


JW 

O  AA/ 

o  W 


o-v 


e.g.  50  K 


+  V 


CC 


o_TLTL 
o/w 


o-v 


Fig.  4.  Variable  duty  cycle  oscillator. 

A  typical  ham  application  would  be  to 
produce  a  frequency  modulated  (e.g.,  455 
kHz  i-f)  signal  for  mixing  purposes.  Another 
use  for  this  circuit  is  the  determination  of 
filter  bandpass  curves  by  frequency 
wobbling. 

Variable  Duty  Cycle  Oscillator 

If  the  timing  resistor  circuit  (Rl  through 
R4,  Fig.  1 )  is  changed  as  outlined  in  Fig.  4, 
the  duty  cycle  of  the  output  signals  can  be 
adjusted  from  2%  to  98%.  Thus,  a  variable 
mark-space  ratio  square  wave  or  a  sawtooth 
shaped  triangular  wave  can  be  generated. 
The  frequency  of  a  (360°)  wave  stays  con- 
stant regardless  of  the  position  of  RAB. 
Rf  permits  about  one  decade  of  frequency 
adjustment  without  changing  Cf. 


Fig.  3.  Connections  for  frequency  modulation. 


Comments 

After  you  build  this  signal  generator  the 
dial  has  to  be  calibrated.  This  work  requires 
preferably  a  frequency  counter.  The  high 
value  timing  capacitors  (50/iF  and  500  ^F) 
were  electrolytics,  and  my  dial  calibration 
was  somewhat  "out"  on  these  2  low  fre- 
quency ranges.  The  wave  outputs  of  the 
8038  deteriorated  slightly  above  500  kHz. 

The  cost  of  the  signal  generator  runs 
about  $20.  The  Intersil  8038  function  gen- 
era tor  chip  can  be  purchased  for  $5  in  the 
U.S.,  $6-90  in  Canada,  in  single  quantities, 
What  makes  this  unit  so  handy  is  that  it  — 
unlike  the  NE566  generator  -  outputs  a  sine 
wave  signal  also.  It  is  a  worthwhile  piece  of 
equipment  for  the  homebrewer. 

. .  .VE3GSP 

References:     Intersil     application     note;     8038 
waveform  generator. 


DECEMBER  1973 


43 


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automobile  battery  without  running  it  down.  This  is  the  perfect  companion  foi  commercial  and  amateur  solid 
State  transceivers  in  the  2  to  10  watt  class.  Power  outputs  of  100  watts  and  more  are  acheived  with  no  more 
current  than  some  tube  amplifiers  require  for  stand  by  current.  This  amplifier  is  truly  a  dollar  per  watt  bargain, 
$1 .50  per  watt  of  output  to  be  exact,  and  a  real  battery  saver, 

Also  available  as  accessories  area  low  noise  receiver  preamplifier  utilizing  a  MOS  FET  transistor,  an  AC 
power  supply,  a  control  head  that  measures  RF  power  output,  DC  voltage  and  turns  the  amplifier  on  and  off 
remotely  and  a  trunk  mounting  cable  kit. 

FEATURES:    All  Solid  State,  no  tubes  to  ever  replace  or  shake  loose- 
Low  Stand-by  current,  typically  5  ma.  (a  comparable  tube  amplifier  would  require  5  to  10  amps) 

Low  transmit  current,  typically  12  amps,  (a  comparable  tube  amplifier  would  require  25  to  40 
amps  ) 

Absolutely  indestructible;  immune  to  mismatch,  over  drive  and  over  voltage. 

Extremely  compact: 

No  external  cooling  or  ventilation  required. 

May  be  mounted  anywhere:  Trunk,  under  the  seat,  etc. 

Many  Accessories  available;  Trunk  mounting  cable  kit,  remote  control  /power  output  monitor, 

AC  power  supply  and  Bi-linear  receiving  amplifier  with  MOS- FET  transistor. 


44 


73  MAGAZINE 


•  It 


COMMUNICATIONS     INC. 

13  12  5     YUKON     AVENUE/HAWTHORNE.      CALIF.      0O2SO/(2l3)      6  7  9     0  13  1 


TPL  has  a  COMPLETE  line  of  RF  Power  Amplifiers 
for  Six  &  Two  meters  and  450  MHz  . . . 


TPL  15  to  20W  Amp.  Give  your 
handheld  the  punch  it  needs  with 
as  little  as  50mw  drive. 


PA61  -AC2/BC2  (450) 


TPL  80  to  120W+.  If  you  want  the 
ultimate  in  power  &  performance, 
look  no  farther.  Turn  your  talkie 
or  transceiver  into  a  booming  giant 


PA3-  1AE/1AB  {2  meters) 

TPL  20  to  35 W  Amp.  If  your  needs 
are  450,  this  is  your  amp.  Up  to  35 
watts  or  more  when  driven  by  your 
mobile  or  handheld. 


PA3-  1EE/1AE/1DE  (2  meters} 


TPL  REPEATER  CONFIGURATION 

If  repeaters  are  your  thing,  TPL  has 
the  answer.  Order  any  TPL  amp  in 
the  repeater  configuration.  Designed 
to  mount  in  standard  19"  rack. 
Completely  RF  shielded  with  AC 
supply  and  forced  air  cooling. 


tit 


COMMUNICATIONS     INC. 

YUKON     AVENUE/HAWTHORNE.     CALIF        #0250/(213)      679-0131 


IS 


A  brand  new  220  MHz  solid  state  FM  transceiver. 
The  220  TR's  power  output  is  10  watts.  The 
receiver  is  double  conversion  with  a  tunable  and 
crystal  controlled  receiver.  FM  is  detected  by  a 
limiter  discriminator  featuring  full  noise  satur- 
ation for  weak  signal  reception.  Sensitivity  is 
typically  .5  microvolts  for  20  dB  quieting. 
Variable  tuning  is  accomplished  in  two  bands  , 
220-222.5  MHz  and  222.5-225  MHz.  Its  size  .  . 
.  only  7"W  x  2  3/8"H  x  10  1/2"D. 


TEMPO  220 

Need  extra  mobile  power?  Here  is  the 
answer.  Up  to  1 00  watts  or  more  on  220  for 
when  you  need  that  extra  punch.  Same  high 
quality  TPL  construction  and  reliability. 


MOBILE  AMP 


Completely  self-contained 
for  home  operation.  Mount- 
ed in  standard  19-inch  rack 
with  power  supply  and  blow, 
er. 


BASE  STATION 


TPL  NOW  OPENS  THE  DOOR  TO  220  OPERATION 
Other  great  TPL  products 


INPUT 

OUTPUT 

FREQUENCY 

INPUT 

OUTPUT 

FREQUENCY 

PART  NO. 

POWER 

POWER 

RANGE 

PART  NO 

POWER 

POWER 

RANGE 

PA3-1AE 

50*250mw 

15*25W 

136- 

■l75MHi 

PA3-10D 

5-T5W 

60-80W 

136-1 75MHZ 

PA3-1AB 

.T5-3W 

20-25W 

■  ■ 

PA3-1EE 

50- 250m  w 

B0-12OW 

■■ 

PAS- 1  EC 

50*15Qmw 

30-50W 

n 

PA3-1AE 

.75-3W 

80-1 20 W 

n 

PA3-1AC 

1-5W 

35-50W 

•  « 

PA3-1DE 

5-15W 

80-120W 

*• 

PA3-1DC 

6-1 5  W 

30-55W 

i  i 

PA6-1DE 

1-4W 

20»30W 

400-51 2MH* 

PA3-1ED 

50-250mw 

60-60W 

M 

PA6-1AD 

4-10W 

25-35W 

it 

FCC  type  accepted  for  operation  under  parts 
21,  81 ,  09,  91,  93,  95,  Meets  FCC  specifica- 
tion: Part  5,  subpart  C,  paragraph  5  103  (a). 

Other  products: 

VHF  FM  25-50  MHz  Class  C  amplifiers 
60W  UHF  FM  Class  C  amplifiers 
90W  UHFFM  Class  C  amplifiers 

Wide  band  linear  amplifiers  in  any  frequency 
range  on  special  order. 


For  complete  specifications  on  any  of  the 
above  units  please  write. 

TPL  amplifiers  are  for  commercial  applica- 
tions- For  non-commercial  uses  please  con- 
tact your  local  Tempo  dealer. 

Dealer  inquiries  invited, 

MANUFACTURED    IN    USA 


•  • 


COMMUNICATIONS    INC. 

13125  YUKON   AVENUE/  HAWTHORNE,  CALIF.  90250/(213)  679-0131 


COMMUNICATIONS      INC. 

13125      YUKON      AVENUE/HAWTHORNE.      CALIF         90250/(2131      679-0131 

12  VOLT  SOLID  STATE  AMPLIFIERS  FOR  AMATEUR  OPERATION 


BAND 

PART   NUMBER 

FREQUENCY 

POWER    IN 

POWER    OUT 

AMATEUR 
NET   PRICE 

6M 

TPL 

1006 

50-54MHz 

10 Watts 

1 lOWatts 

$185.00 

6M* 

TPL 

2006 

50-54MHz 

lOWatts 

2 20 Watts 

$270.00 

2M 

TPL 

152 

144-148MH2 

IWatt 

12 Watts 

$   59.00 

2M 

TPL 

302 

144-USMHz 

IWatt 

30Watts 

$  93-00 

2M 

TPL 

5026 

144-USHHz 

IWatt 

SOWatts 

$130.00 

2M 

TPL 

80  2B 

144-USMHz 

IWatt 

90 Watts 

$195.00 

2M 

TPL 

1202B 

144-148MHz 

IWatt 

120Watts 

$239.00 

2M 

TPL 

502 

144-HSMHz 

lOWatts 

45Watts 

$113.00 

2M 

TPL 

802 

144-1 48M Hz 

lOWatts 

90 Watts 

$191.00 

2M 

TPL 

1202 

144-148MHz 

lOWatts 

120Watts 

$228.00 

2M* 

TPL 

2002 

144^148mHz 

lOWatts 

2Q0Watts 

$375.00 

220MHZ* 

TPL 

401 

220-225MHZ 

lOWatts 

40 Watts 

$118.00 

220MHz* 

TPL 

901 

220-225MHz 

lOWatts 

90 Watts 

$175.00 

440MHz 

TPL 

300 

420-450MHZ 

4Watts 

25Watts 

$162.00 

440MHz 

TPL 

300  B 

420-450MHz 

lWott 

25Watts 

$190.00 

440MHz 

TPL 

600 

420-450MHz 

4Watts 

60Watts 

$245.00 

440MHz 

TPL 

600B 

420-450MHz 

IWatt 

60Watts 

$278.00 

10M 

TPL 

5010 

14-30MHz 

100  Watt 
ISOWatt 

FM 

PEP   SSB 

$169.80 

80-10M* 

TPL 

20  01 

2- 30 MHz 

400 Watts 

PEP    SSB 

$395.00 

*  Available  Spring  1974 


DEALERS!   NOW  CARRY  THE  BEST   FROM  TPL  .   .   .  . 

Dealer/Distributor  must  agree  to  agressively  promote  the  sale  of  TPL  products 
within  the  territory  specified  in  the  Deafer/Distributor  Agreement 


•  Dealer/Distributor  is  expected  to  follow  up  on 
sales  reads  supplied  supplied  by  TPL, 

•  Submission  of  advertising  and  catalog  copy  must 
be  made  for  factory  approval  whenever  the  TPL  logo 
or  trademarks  are  utilized. 

WARRANTY  AND  SERVICE  POLICIES 

•WARRANTY  -  TPL  COMMUNICATIONS,  INC. 
warrants  each  instrument  manufactured  by  them  to 
be  free  from  defects  in  material  and  workmanship. 
Our  liability  under  this  warranty  is  limited  to 
servicing  or  adjusting  any  instrument  which  is 
returned  to  the  factory  for  that  purpose  and  to 
replacing  any  defective  parts  thereof,  This  warranty 
on  ail  parts  and  labor  is  effective  for  180  days  after 
delivery  to  the  original  purchaser  on  amateur  and 
commercial  products,  provided  that  aJI  instructions  as 
to  installation,  use  and  operation  are  followed  and 
the  fault  has  not  been  caused  by  misuse,  accidents, 
negligence,  alteration,  unauthorized  repairs  and  the 
equipment  has  not  been  damaged  by  excessive  input 
power,  lighting,  water  flooding  or  freight  damage. 


•  Point    of    sales    material    is    expected    to    be 
prominently  displayed. 

•  The  Dealer/Distributor  is  expected  to  coordinate 
advertising  with  TPL's  national  program. 

•SERVICE  POLICY  -  If  It  is  necessary  to  return 
any  In-war ranty  equipment  to  the  factory,  return 
authorization  should  be  obatained.  If  at  all  possible. 
DO  NOT  return  units  without  prior  factory 
authorization.  This  often  permits  solving  problems 
without  the  necessity  for  return. 

•  WARRANTY  REGISTRATION  -  TPL 
COMMUNICATIONS,  INC,  is  under  no  obligation  to 
extend  the  above  warranty  to  any  unit  for  which  a 
Warranty  Registration  card  has  not  been  completed 
and  mailed  to  the  Corporation  within  ten  days  (10) 
after  date  of  delivery.  Warranty  is  extended  to  the 
ORIGINAL  purchaser  only! 

•ORDERING  INFORMATION  -  The  following 
information  will  alfow  us  to  fill  your  order  with 
maximum  speed  and  effeciency.  1 -Operating 
frequency^  1MHz.  2-Power  input  +  25%. 


FOR  COMPLETE  INFORMATION  CALL  TPL  NOW! 


DECEMBER  1973 


47 


4-BTV  THRIVES  ON  COMPARISON! 

FOUR  BAND-40  THRU  10  METERS 
FIXED  STATION  TRAP  VERTICAL 

Whether  you  want — 

•  one  setting  for  total  band  coverage 

•  extra  weight  and  high  mechanical  strength 

•  easy  assembly  and  installation 
— or  just  plain  performance  and  reliability — 

Hustler  is  the  verified  choice! 


1 


PERFORMANCE  AND  MECHANICAL  SPECIFICATIONS 


«  Lowest  SWR— PLUS! 

•  Bandwidth  at  its  broadest!  SWR 

1.6  to  1  or  better  at  band  edges. 

•  Hustler  exclusive  trap  covers 
"Spritz"  extruded  to  otherwise 
unattainable  close  tolerances 
assuring  accurate  and  permanent 
trap  resonance. 

•  Solid  one  inch  fiberglass  trap 
forms  for  optimum  electrical  and 
mechanical  stability. 

•  Extra  heavy  duty  aluminum 
mounting  bracket  with  low  loss — 
high  strength  insulators. 

•  All  sections  VA"  heavy  wall,  high 

strength  aluminum.  Length  21 '5". 


Stainless  steel  clamps  permitting 
adjustment  without  damage  to  the 
aluminum  tubing. 

Guaranteed  to  be  easiest  assembly 
of  any  multi-band  vertical. 

Antenna  has  %"-24  stud  at  top  to 
accept  RM-75  or  RM-75-S  Hustler 
resonator  for  75  meter  operation 

when  desired. 

Top  loading  on  75  meters  for 
broader  bandwidth  and  higher 
radiation  efficiency! 

Feed  with  any  length  50  ohm  coax. 

Power  capability- — full  legal  limit 
on  SSB  and  CW. 

Ground  mount  with  or  without 

radials;  roof  mount  with  radials. 


MODEL      4-BTV 
WGT.  15  pounds 


$49.95 


Buy  Hustler . . .  buy  the  verified  choice  of  thousands1. 

Available  from  all  distributors 
who  recognize  the  best! 


new* 

tronics 
corporation 


15800  commerce  park  drive, 
brook  park,  Ohio  44142 


Exporter:  Roburn  Agencies,  Inc.,  New  York,  N.Y. 


HELICAL 

RESONATOR 

DESIGN 


Lawrence  E.  Stoskopf  W0PSF/Q 
4117  Adams,  Apt  213 
Kansas  City  KA  66205 


Selectivity    cookbook    for   any 
frequency. 


Helical  resonators  provide  an  excellent 
approach  to  filter  design  for  the  high 
and  very  high  frequency  ranges  where  high  Q 
and  reasonable  shape  and  size  are  needed. 
Coaxial  and  strip  line  filters  become  un- 
wieldy at  the  upper  limits  of  the  HF  range 
and  ferrites,  in  general,  have  lower  Q  at 
higher  frequencies.  In  spite  of  several  con- 
struction articles  using  helical  filters,  their 
design  parameters  have  not  been  generally 
available  for  those  with  limited  libraries.  The 
following  has  been  adpated  from  the  excel- 
lent, but  expensive,  Handbook  of  Filter 
Synthesis  by  Anatol  Zverev  and  from  the 
original  articles  by  Macalpine  and 
Schidknecht 

The  helical  resonator  consists  of  a  coil 
containing  roughly  one  quarter  wavelength 
of  wire  enclosed  in  a  shield  and  grounded  to 
the  shield  at  one  end.  Dimensions  are  cal- 
culated from  L  and  C  equations  based  upon 
the  shape  factor  of  the  coil  and  size  relative 
to  the  shield.  This  shape  factor,  once  estab- 
lished, must  be  closely  adhered  to  if  degrada- 
tion of  Q  is  to  be  avoided*  Those  interested 
in  derivation  of  the  design  equations  should 
refer  to  the  references  cited. 

Nomographs  are  often  utilized  for  rough- 
ing out  a  design,  formulas  to  fix  the  design, 
and  trial  and  error  for  final  adjustment. 
Figures  1  and  2  are  unique  in  being  the 
nonmovable  portion  of  a  slide  rule.  The 
sliding  portion  is  constructed  as  follows:  Set 
a  sheet  of  paper  with  one  edge  at  1  on  the 
frequency  scale.  Mark  the  frequency  of 
interst  and  cut  perpendicular  to  the  scale,  In 
the    center    near    the    word    SQUARE    or 


CIRCLE  cut  half  way  parallel  to  the  fre- 
quency scale  and  fold.  The  slide  will  be 
similar  to  the  dotted  area  of  Fig.  1 ,  which  is 
constructed  for  21  MHz.  The  lower  edge 
should    be   set   to   the  desired   cross-section 

size,   4  centimeters  in  the  example.  Sizes  D 


150 

BOO 
E50 


133" 


144_ 


_  500 


12. 


IGl. 


nr 


5 


4a. 


iae    64_ 


4a 


El 


14^ 


7_ 


4_ 


3a 


16- 
12. 


CD 


Ul 


750 
LLOOO 


_2O00 


^4000 


J&4 


_4e  i£8^ 


^JotJtKj 


J3O00 


IB 


u 


5 


_■■■     ■     i     ■     i    •   j    i    i  ■   ■   r   r    t.    i     iiii 

>    I   P  I    U  H    I   M   i    H  ■ f 

■  r   r^bi    i    i    i    ■    i    i    ■ 

. " 


i 


iA 


B  3 


II 

N 


Q 


O 

ii 
ffi 


Fig.  la.  A  reduced  version  of  the  nomograph  on 
the  next  page  showing  the  shape  of  the  movable 

paper  mask  (shaded  portion)  used  for  determining 
helical  resonator  dimensions.  A  new  mask  must  be 
made  for  each  frequency  band.  The  one  shown  is 
for  21  MHz, 


DECEMBER  1973 


49 


M 


4_ 


E 


4 


+J^^m^^m 


144 


54. 


El 


14 


7. 


4_ 


IE 


1& 


24_ 


5 


48 


64 
4E 


J96 


B4J 


3E 


24 


IE 


IE 


E 


4. 
3_ 


E4 


.48  ieQ 


3£ 


16 


IE 


e 


_  E 


4 


in  L 


_  3 


2 


II  II 


L 


_  200 


.  400 

L  500 


_  750 
^LOOO 


1500 


^2000 


J3000 
_4000 


EOOO 


JBOOO 


in 


m^^m 


in 
\ 


II 
N 


n 


r     ^ 
\ J 

rv 


in 


o 
ii 

CD 


K 


m 


*l 


T 

1 


4000! 
3000. 


Q 


EOOO. 
1500. 


1000- 


500. 
400 

300. 


200. 
150. 


01 


II 

a 


M 


4_ 


IE 


IE 


E4_ 


?! 


II 


4 

8 

IS 


480^ 


IB 


24. 


IE 


4 


E8 


IE 


E 


4_ 


in 

n  in 
m  in 

in  • 
o 

cE  ii 

D 


_48 


12 


L  8 
_  G 


_  4 

_  3 


_  2 


Fig.  lb.  Nomograph  for  determining  the  dimensions  of  helical  resonators  in  round  shields.  See  text 
and  Fig,  la,  for  use. 


SO 


73  MAGAZINE 


M 


4_ 


F 


144. 


54. 


El 


14_ 


7. 


4_ 


IE 


_  200 


_  400 


^LOOO 


5 


32. 


_2000 


64 


32 


12 


Q 


E 


4j 
3L 


4a 


B4_ 


_48 


12a 


12 


_  B 
_  B 


01 


01 
b_ 
\ 


L  3 


4  CD 


II     II 


1500 


3000 


_4000 


UBOOO 
JBOOO 


ui 


^■^ 


u 


\ 


ii 

N 


a 


I* 


in 


M 


T 

D 

1 


4000! 
3000. 


Q 


2000- 


/       1500. 


1000. 


400- 
300. 


200. 


01 
II 

a 


*l 


T 


P 


4_ 


a 


12 


32 


II 


4 

,  B 
12 


4aL 


IB 


4. 


01 

kl  tD 

01    • 

o 

E   ii 


a 


1 


24 


12 


B 
6 


L  4 

3 


_  2 


Fig.  2.  Nomograph  for  determining  the  dimensions  of  helical  resonators  in  square  shields.  See  text  and 
Fig.   la,  for  use. 


DECEMBER  1973 


51 


DISTRESS  SALE 


^^^^_ 

_           VPt  *  i-  "             "  *  * 

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iivrt 

I 

famous  Saran  Speech  Clipper.  We  bought  enure  manutae- 
turing  facility  and  we  are  selling  a  kit  consisting  of  all  the 
parts*    Included  are  case  -  PC.  board  -  transistors  -  resis- 
tors —  knobs  -  meter  switch,   etc.    Everything   needed   to 
build  this  fine  clipper  at  a  fraction  of  the  original  cost. 
Some  of  the  features  are; 
1—  Connects  between  mike  and  transmitter 
2— Ample  pre-ampltfication  to  assure  full  clipping 
3— Meter  mdtcator 
4- All  solid  state 

5— For   all   high   or  low   level  crystal,  ceramic  or  dynamic 
mike  phones. 


Sale  •  kit  of  all  parts  S12.Q0  each 
all  parts  less  b-1   ma.  meter  S6,00 

ALL   PARTS   guaranteed. 
Limited   quantities 

Please   enclose  $1.00   for   packing   and   shipping. 
Send   order  to; 

HIRSCH  SALES  COMPANY 

219  CALIFORNIA  DRIVE 
WILLIAMSVILLE,  NEW  YORK  14221 


CFP  ENTERPRISES 

866  Ridge  Road 
Lansing,  NY    14882 

Central  Upstate  New  York's 
Mail-Order  Headquarters 

Specializing  in  Two- Meter  FM 
and  Quality  Used  Gear 

Off  iceand  Salesroom  Hours  by  Appointment  Only 

24-Hour  Phone:  607-533-4297 
Send  SASE  for  Bi-Monthly  Listing  of: 

Used  Equipment  and  Bargain  Goodies 

Trade-ins  accepted  on  both  new  and  used 
equipment,  Cash  deals  get  prepaid  shipping  in 
the  Continental  USA  plus  a  15%  discount  on 
the  items  on  our  regular  listing!*!!! 

and  H  are  read  from  the  lower  edge.  Q, 
impedance  (Z),  number  of  turns  (N)?  turns 
per  centimeter  (T),  and  wire  size  are  read 
from  the  top.  For  the  example:  2.2,  5.3, 
370,  3000,  14.3,  30.  Wire  size  is  that  which 
fills  half  of  the  winding  space.  In  this 
manner,  the  effect  of  shield  size  on  the 
desired  parameters  may  be  quickly  explored, 
No  attempt  has  been  made  to  add  many 
divisions  to  the  scales  as  working  values 
should  be  calculated  from  the  formulas 
listed  near  each  line.  Values  will  be  within 
ten  percent.  Practical  size  limits  are  those 


smaller  than  results  in  less  than  three  turns, 
where  the  helix  loses  its  shape  and  larger 
than  that  where  wire  size  is  limited  by 
number  of  turns  and  resistance  degrades  Q, 

Ideally  the  shield  should  be  seamless. 
Unplated  copper  pipe  is  excellent  up  to  100 
MHz,  but  wastes  space  unless  amplifier 
components  are  fitted  in.  Square  shields  are 
compact,  and  soldering  or  dip  brazing  the 
seams  shouldn't  prove  difficult  for  the  home 
constructor. 

If,  as  in  the  formulas  given,  the  shield 
extends  beyond  the  coil,  no  top  or  bottom 
caps  are  needed  unless  maximum  shielding  is 
desired.  If  used,  they  must  be  soldered  for 
low  loss.  The  coil  may  be  directly  grounded 
or  attached  to  a  low  loss  feed  thro  ugh  capaci- 
tor if  needed.  The  open  end  should  not  turn 
in  or  out  and  the  end  rounded  if  power  is  to 
be  applied.  Any  coil  form  should  be  of  low 
loss  material. 

Coupling  is  best  determined  by  trial. 
Simplest  is  the  familiar  tap,  vety  close  to  the 
grounded  end,  which  also  adds  stability  to 
the  coil.  A  link  around  the  grounded  end  or 
a  probe  at  the  open  end  have  been  used.  An 
aperture  at  the  base  is  often  used  to  couple 
square  shields,  but  is  difficult  to  adjust.  A 
variable  capacitor  in  series  with  the  normally 
grounded  end  allows  variable  coupling:  mini- 
mum coupling  being  when  the  capacitance  is 
series  resonant  with  the  portion  of  the  coil 
below  the  tap  and  maximum  coupling  at 
maximum  capacity.  Fine  tuning  may  be 
made  by  deforming  the  coil  slightly  or  by 
adding  a  small  trimmer  or  disc  to 'the  open 
end. 

With  their  inherent  simplicity,  helical 
resonators  should  find  numerous  applica- 
tions as  repeater  front  ends,  as  narrowband 
receiver  filters  for  the  DX  bands,  and  even 
W1BB  might  find  the  1  KHz  bandwidth  of  a 
large  oil  drum  useful  on  f  60m. 

.  -  .W0PSF/0 

REFERENCES: 

1.  Macalpine  and  Schildknecht,  "Coaxial  Resona- 
tors with  Helical  Inner  Conductors/'  Proceedings 
of  the  IRE.  December  1959. 

2.  Macalpine  and  Schildknecht,  "Helical  Resonator 
Design  Chart/1  Electronics.  August  1960. 

3.  Myers  and  Greene,  "Held  Day  Kilters/*  QST- 
April  1 973. 

4.  Zverev,  A:  Handbook  of  Filter  Synthesis  Wiley, 
New  York,  1967, 


\j  £. 


73  MAGAZINE 


J.  M.  Lomasney  WA6NIL 
2501  Waverley  Street 
Palo  Alto  CA  94301 


SENSITIVE 

RF 

VOLTMETER 


This  rf  voltmeter  has  full-scale  ranges 
_  from  0.03V  to  1 0V  and  frequency 
response  flat  from  40  kHz  to  over  200  MHz, 
making  it  useful  for  most  solid-state  work.  It 
is  portable  and  battery  operated .  I  had  need 
of  such  a  meter  in  my  work.  After  hauling  a 
commercial  meter  and  a  115V  ac  generator 
out  in  the  boondocks  a  few  times,  I  decided 
to  try  and  build  a  battery-operated  meter. 

The  performance  and  accuracy  of  the 
finished  meter  depends  greatly  on  how  much 
care  is  taken  with  the  matching  of  the 
semiconductors  in  it,  and  the  adjustment 
and  calibration.  These  procedures  will  there- 
fore be  described  in  considerable  detail. 

The  circuit  uses  a  rectifier-type  probe, 
followed  by  a  high-gain  dc  amplifier  driving 
a  mi lliam meter.  The  first  try  at  a  dc  ampli- 
fier ustd  a  pair  of  FET*s  connected  as  a 
differential  amplifier  to  drive  a  microam- 
meter.  To  get  the  required  sensitivity,  it  was 
necessary  to  select  high-transconduetance, 
high-current  FETs  and  to  use  a  meter  of 
0-50  JuA  or  even  less  range.  It  was  found 
that  this  circuit  required  18— 20V  supply  to 
keep  the  FET's  operating  linearly,  and  it 
could  dump  several  milliamperes  into  the 
meter  if  it  became  unbalanced  for  any 
reason.  When  I  found  I  had  no  spare 
sensitive  meter,  and  none  of  my  friends  was 
about  to  turn  any  loose,  this  whole  approach 
was  dropped. 


A  two-stage  amplifier  was  then  tried.  This 
time  the  FET*s  were  chosen  for  low  pinch- 
off  voltage,  therefore  low  current  drain.  This 
meant  the  voltage  drop  in  the  biasing  resistor 
and  the  drop  from  drain  to  source  could  also 
be  low.  The  stage  would  work  with  supply 
voltage  from  a  9V  battery,  even  a  fairly  old 
battery  which  had  fallen  off  to  7 V  or  so. 
The  gain  of  the  stage  was  low,  too,  but  the 

following  high-gain  pair  of  transistors  in  the 
second  stage  took  care  of  that.  The  complete 
circuit  in  Fig,  1  would  easily  drive  a  rugged 
1-mA  meter.  At  the  same  time,  it  would  not 
deliver  enough  overload  current  to  hurt  the 
meter.  The  total  battery  drain  was  about  5 
mA  from  a  9V  battery. 

The  rf  probe  is  a  voltage  doubler  circuit, 
using  silicon  diodes  which  are  forward-biased 
for  maximum  sensitivity,  Germanium  diodes 
were  tried  first,  but  the  silicon  diodes  proved 
to  be  much  less  affected  by  temperature. 
With  proper  forward  bias,  there  is  very  little 
difference  in  small-signal  performance  be- 
tween germanium  and  silicon  types.  A 
second  pair  of  diodes  with  no  rf  input  signal 
are  mounted  in  the  probe  and  connected  to 
the  other  side  of  the  dc  amplifier's  balanced 
input  circuit,  thus  compensating  for  any 
temperature  drift  in  the  rectifier  diodes.  The 
capacitors  CI  and  C2  in  the  probe  are 
deliberately  kept  small  to  restrict  the  low 
frequency  response  of  the  meter  for  several 


DECEMBER  1973 


53 


reasons:  to  make  the  meter  insensitive  to 
hum  pickup,  to  make  it  read  carrier  level  on 
an  audio-modulated  signal  regardless  of  the 
modulation  percentage,  and  to  minimize  the 
strain  on  the  diodes  if  the  probe  is  acci- 
dentally touched  to  a  point  of  high  dc 
potential. 

Referring  to  Fig,  1.,  diodes  CR1?  CR2 
and  capacitors  CI,  C2  are  the  voltage  doub- 
les The  compensating  diodes  CR3,  CR4  are 
mounted  in  the  probe  also,  so  they  will  stay 
at  the  same  temperature  as  CR1  and  CR2. 
The  diodes  are  type  1N914,  which  have 
excellent  high  frequency  performance, 
reasonably  high  voltage  rating  and  low  cost. 
These  parts  are  mounted  in  an  old  lipstick 
case.  The  business  end  of  the  probe  is  a  piece 
of  No.  14  tinned  bus  wire,  straightened  out 
and  filed  to  a  point.  The  removable  50fi  2W 
load  is  built  into  the  lipstick  cap  as  shown  in 
Fig.  2,  At  the  10V  maximum  input  to  the 
instrument,  this  load  just  reaches  full  dissipa- 
tion* The  reverse  voltage  rating  of  the  diodes 
is  high  enough  so  there  is  a  comfortable 
margin  of  safety  at  IOV  rf  input.  The  probe 
connects  through  two-conductor  shielded 
microphone  cable  to  a  two  pin  microphone 
plug  mating  with  the  two  pin  connector  on 


the   cabinet.   Any   small   three-wire  or  two- 

wire-plus-ground  connector  would  do. 

The  Amplified  Circuit 

The  dc  signal  and  reference  outputs  from 
the  probe  are  each  connected  to  a  voltage 
divider  associated  with  the  range  switch  SL 
The  cold  ends  of  the  two  voltage-divider 
strings  are  connected  to  the  bias  source, 
diodes  CR5  and  CR6,  which  are  supplied 
about  0.4  mA  current  through  resistor  Rl  L 
(This  is  far  more  current  than  will  ever  flow 
in  the  voltage  dividers,  so  there  is  always 
current  flowing  through  CR5  and  CR6.)  The 
negative  voltage  across  CR5  and  CR6  for- 
ward biases  the  signal  diodes  CR1  and  CR2 
for  best  sensitivity.  Even  with  no  rf  input  to 
the  probe,  a  tiny  forward  current  flows  from 
the  bias  source  through  resistors  Rl,  2,  3,  4, 
5  and  the  signal  diodes.  An  equal  current 
flows  through  R6S  7,  8,  9,  10  and  the 
reference  diodes  CR3,  CR4,  so  that  if  the 
diodes  and  resistors  have  been  well  matched 
(as  described  later),  equal  voltages  will  ap- 
pear at  the  output  contacts  of  switch  sec- 
tions Sla  and  Sib  when  no  rf  signal  is 
applied  to  the  probe,  and  the  meter  will  read 
zero.  As  rf  signal  is  applied,  the  dc  voltage  at 


CI 
330pF 


CR2 
IN9I4 


CRI 
IN9I4 


>f 


I 


330pF 


POWER 
ON-OFF 


ZERO  ADJUST 


Cf?3 

IN9I4  ■  CR4 

IN9I4 


3t 


2-WIRE 

SHIELDED 

CABLE 


U 


Fig.  1.  Circuit  diagram  of  the  WA6NIL  rf  voltmeter. 


54 


73  MAGAZINE 


The  rf  probe  is  built  on  a  small  piece  of  perf-board  and  then  tucked  into  your  favorite-brand  lipstick 

case. 


Sla  (feeding  the  gate  of  FET  amplifier  Ql) 
becomes  more  positive,  while  the  voltage  at 
S 1  b  feeding  the  gate  of  Q2  stays  put. 

Field-effect  transistors  Ql  and  Q2  are 
matched  and  the  Zero  Adjust  control  R15  is 
set  so  that  the  drain  voltages  of  Ql  and  Q2 
are  equal  when  their  gate  voltages  are  equal, 
that  is,  when  no  rf  input  voltage  is  applied  to 
the  probe.  The  large  common-source  resistor 
R12  causes  the  total  drain  current  of  Ql  and 
Q2  to  stay  about  constant,  so  that  while  Ql 
drain  voltage  goes  negative  as  rf  signal  is 
applied,  Q2  drain  voltage  goes  positive  by  a 
nearly  equal  amount, 


The  second-stage  amplifiers  Q3  and  Q4 
are  high -gain  NPN  transistors,  selected  for 
highest  gain  and  matched  so  that  the  meter 
between  their  collectors  reads  zero  or  very 
near  it  when  the  voltages  at  their  bases  (from 
Ql  and  Q2  drains)  are  equal.  A  slight 
adjustment  of  the  Zero  Adjust  control  will 
then  make  the  meter  read  exactly  zero  at  no 
signal  input. 

The  large  resistors  R16,  R17  in  the 
emitter  circuits  of  Q3  and  Q4  would,  with- 
out the  gain  trimmer  resistors,  make  this 
stage  very  low  gain  and  stable  because  of  the 
large    inverse    feedback.    One    of   the    gain 


The  top  of  the  case  contains  a  SOil  load  and  plugs  onto  the  rf  probe.  The  construction  is  detailed  in 
Fig.  2.  Ground  connection  is  accomplished  via  the  short  piece  of  wire  and  clip. 


DECEMBER  1973 


55 


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trimmer  variable  resistors,  R20  or  R21.  as 
selected  by  the  range  switch  Sic,  is  connec- 
ted between  the  two  emitters;  when  this 
resistance  is  small,  the  inverse  feedback  is 
cut  down  and  the  stage  gain  is  high,  while 
when  the  gain  trimmer  resistance  is  high,  the 
stage  gain  drops  to  a  low  value.  It  was 
originally  intended  that  this  method  of 
changing  gain  would  be  used  for  switching 
between  the  three  most  sensitive  ranges, 
leaving  the  other  ranges  to  be  switched  by 
the  voltage  divider  RI-R5,  However,  the 
efficiency  of  the  diodes  in  the  probe  is  very 
low  on  the  0.03V  range,  so  there  is  a  large 
difference  in  gain  between  this  and  the  0.1  V 
range  in  the  dc  amplifier,  The  Q3-Q4  stage 
must  run  at  nearly  full  gain  on  the  0.03V 


LIPSTICK  CAP 


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EIGHTH/4    WATT    RESISTORS 
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SPRING  BRASS, 

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TIP   JACK  CONTACT 


LOCKWASHER 


oo 


note  : 

IN   ASSEMBLY,  PUSH  RESISTOR  ASSEMBLY   ALL  THE   WAY 
IN   SO  THE  8USHIN6   PROTRUDES  OUT  THROUGH   THE 
MOUNTING    NUT.   INSERT   TIP    JACK  CONNECTOR   INTO 
BUSHING  AND   TIGHTEN   SETSCREW,    PUSH   BNC 
CONNECTOR   DOWN   AND  TIGHTEN  IT  INTO  MOUNTING   NUT. 

Fig.  2.  Construction  of  the  50£2  probe  adaptor. 


73  MAGAZINE 


range,  and  almost  at  minimum  gain  on  the 
0.1V  range,  The  voltage  divider  then  pro- 
vides switching  to  all  the  higher  ranges.  A 
third  gain-trimming  resistor  was  originally 
provided  and  can  be  seen  in  the  photo,  but 
will  not  be  needed  if  the  voltage  divider 
resistors  are  adjusted  as  described  later. 

The  I  mA  meter  is  a  surplus  item.  It  is  a 
large  rectangular  type;  a  large  size  is  de- 
sirable since  four  scales  must  be  put  on  it 
The  meter  originally  had  an  odd-ball  scale, 
furlongs  per  fortnight  or  something,  but  this 
did  not  matter  as  new  scales  had  to  be  drawn 
and  hand-calibrated  anyway.  The  original 
scale  was  used  to  determine  the  proper  size 
and  location  of  the  new  scales.  The  dial  plate 
was  then  turned  over  and  the  new  scale 
glued  on  its  back  with  rubber  cement.  The 
meter  is  connected  between  Q3  and  Q4 
collector  to  read  the  current  unbalance 
between  them. 

* 
Construction 

The  layout  and  wiring  of  the  instrument 
is  not  critical.  Ail  the  high-frequency  circuit- 
ry is  in  the  probe,  and  the  rest  can  be  laid 
out  in  any  convenient  fashion.  The  only 
front  panel  controls  are  the  range  switch,  the 
battery  on-off  switch  and  the  zero-adjust 
potentiometer.  I  used  a  screwdriver-adjusted 
control  for  the  zero  adjust;  as  it  was  all  I 
had,  but  a  knob  would  be  better.  I  built  my 
meter  in  a  sloping-front  cabinet  which  hap- 
pened to  be  in  the  junk  box,  with  the  dc 
amplifier  and  voltage  dividers  on  a  piece  of 
perforated  board  with  push-in  terminals. 
This  construction  is  like  a  breadboard  in  that 
it  is  easy  to  make  circuit  changes,  yet  it  is 
compact,  rugged  and  stable  enough  for  a 
permanent  job. 

Looking  back  on  it,  mounting  the  voltage 
dividers  R1-R5  and  R6-R10  on  the  range 
switch  would  have  made  the  job  a  lot 
simpler,  since  not  so  many  wires  would  have 
run  between  the  switch  and  the  circuit 
board.  The  FET's  and  transistors  were 
mounted  in  sockets  rather  than  soldered  in, 
to  make  matching  easier. 

The   first   thing   to  do  is   to  lay  out  the 

parts  in  the  cabinet  or  chassis  and  panel,  and 
mount  the  meter,  zero  adjust  control,  on-off 
switch,  battery  holder  and  the  connector  for 
the    rf    probe.    The    range    switch    with   its 


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57 


Underchassis  view   of  the   voltmeter  showing  component  mounting.    The  gain    trimming  pots  are 
mounted  along  the  bottom  edge. 


associated  resistors  should  he  mounted 
temporarily  where  it  will  be  accessible,  as 
the  values  of  the  resistors  will  have  to  be 
adjusted  later.  Then  the  circuit  board  is  laid 
out  and  built  up  with  the  sockets  for  Ql  ,  2, 
3,  4  and  the  rest  of  the  parts.  Most  of  the 
semiconductors  in  the  circuit  must  be 
selected  and  matched,  but  the  bias  source 
diodes  CR5  and  CR6  are  not  critical  and 
may  be  mounted  at  this  time.  When 
installing  diodes,  it  is  good  insurance  to 
make  a  small  loop  in  the  lead  wires  between 
the  body  of  the  diode  and  the  solder 
terminal,  to  relieve  the  strain.  If  you  can,  use 
close-tolerance  resistors  where  they  are 
called  for.  Buying  1  percent  resistors  in  small 
quantities  is  an  expensive  sport  unless  you 
can  find  them  in  surplus.  Matching  of  pairs 
of  resistors  in  the  two  sides  of  the  circuit, 
such  as  R13  with  R14,  or  R16  with  R17,is 
more  important  than  their  actual  value.  In 
the  case  of  the  voltage  divider  resistors,  their 
values  will  be  trimmed  later  anyway,  so  the 
main  reason  for  using  precision  resistors  here 
is  their  stability.  If  you  are  forced  to  use 
ordinary  composition  resistors,  pick 
matched  pairs  with  a  good  ohmmeter  and 


use  the  same  precautions  you  would  when 
soldering  in  transistors  or  diodes— leave  a 
little  length  of  lead  between  the  body  of  the 
resistor  and  the  solder  joint,  and  put  an 
alligator  clip  or  other  heal  sink  on  the  lead 
while  soldering. 

When  this  much  of  the  circuit  is  built  up 
and  checked  out  visually  and  with  the 
ohmmeter,  you  are  ready  to  select  the  FET's 
and  transistors. 

Selection  of  Semiconductors 

This  circuit  does  not  use  any  of  the 
fancier  techniques  such  as  chopper 
stabilization  to  hold  down  unbalance  and 
drift.  It  is  therefore  very  necessary  to  select 
and  match  the  semiconductors  for  best 
results,  especially  since  the  inexpensive 
devices  used  in  this  circuit  have  a  much 
wider  spread  in  characteristics  than  do 
vacuum  tubes.  It  is  true  that  carefully 
matched  pairs  of  FET's  can  be  had,  but 
these  could  easily  cost  more  than  the  whole 
instrument.  It  seems  much  better  for  ama- 
teur purposes  to  buy  a  good  quantity  of 
each  type  and  select  out  pairs,  leaving  the 
rest  available  for  other  uses.  It  is  a  great  help 


58 


73  MAGAZINE 


if  you  have  access  to  a  stock  of  them.  In  any 
case,  you  should  have  available  at  least  half  a 
dozen  each  of  the  2N4360,s  and  2N3565's 
and  a  dozen  lN914's  or  1N914AY  It  won't 
hurt  to  have  more,  as  they  are  all  very  useful 
devices. 

The  first  step  is  to  select  the  FET  pair, 
Ql  and  Q2.  Set  up  the  test  circuit  of  Fig.  3, 
remembering  that  the  FET  pin  connections 
are  different  from  transistors.  Plug  in  the 
2N4360's  one  after  the  other  and  select  all 
those  which  draw  between  0.4  and  0.5  mA. 
Pick  the  two  which  draw  most  nearly  the 
same  current  and  put  them  in  Ql  and  Q2 
sockets. 

Now  to  match  up  the  second  stage 
transistors.  Switch  to  the  0.03V  range  and 
turn  gain  trimmer  R20  to  zero  resistance. 
Connect  the  circuit  to  the  9V  battery. 
Temporarily  connect  the  base  pins  of  Q3 
and  Q4  sockets  to  each  other  with  a  clip  lead 
or  jumper.  Now  try  various  pairs  of 
2N3565's  in  the  sockets,  looking  for  pairs 
that  make  the  meter  read  nearest  zero.  If 
you  have  a  transsistor  dc  beta  (hFE)  tester 
available,  pick  the  pair  that  show  the  highest 
beta.  If  not,  remove  the  temporary  jumper 
from  Q3-Q4  sockets.  Plug  each  selected  pair 
of  2N3565*s  in  turn  into  Q3  and  Q4  sockets, 
and  choose  the  pair  which  produce  the 
greatest  meter  deflection  for  a  given  small 
amount  of  the  zero  adjust  control.  Leave  the 
chosen  pair  in  Q3  and  04  sockets. 

This  much  of  the  circuit  is  a  nice  sensitive 
dc  voltmeter  of  about  10  mV  dc  full  scale 
deflection  at  maximum  gain.  It  is  now  ready 
to  be  used  for  matching  up  the  diodes.  Set 
the  range  switch  to  its  0.1  V  range  and  adjust 
the  gain  trimmer  R21  to  maximum  resis- 
tance. Connect  one  diode  between  input  pin 
I  of  the  probe  connector  and  ground  as 
shown  in  Fig.  4;  be  sure  to  connect  it  the 
right  way  round.  Temporarily  jumper  input 
pin  1  to  pin  2  and  turn  the  zero  adjust 
control  to  put  the  meter  needle  on   some 


DRAIN 

SOURCE 


0  - 1  m  A 


^Ja) 


BOTTOM  VIEW 

OF 

FET  OR  SOCKET 


o 


6B0O-** 
— ^^\p 


GATE    -L 


—  9   VOLTS 


,A 


PR09E   CABLE  CONNECTOR 


CATHODE 
ANODE 


> 


Sto 

-o* — -o- 


GND 


V 


V 


> 


J     V 


Sib 

•om — o- 


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V 


02 


J 


DIODES 

PART   OF 

TO  BE 

VOLTMETER    CIRCUIT 

yATCHED 

ALREADY  8UILT  UP 

Fig,  3.  Test  circuit  for  selecting  matched  FET's. 


Fig,  4,  Method  of  matching  IN914  diodes. 

mark  near  the  center  of  the  scale.  Now 
remove  the  jumper  between  the  input  termi- 
nals. Try  the  other  1N914  diodes  between 
input  pin  2  and  ground,  sorting  them  into 
groups  by  the  meter  deflection  they  cause. 

Switch  to  the  0.03V  range,  set  R20  to 
zero  resistance,  and  again  jumper  the  input 
pins  together.  Turn  the  zero  adjust  control 
to  put  the  meter  needle  on  the  mark. 
Remove  the  jumper,  and  try  pairs  of  diodes 
from  the  various  groups  for  match  by 
connecting  one  diode  from  pin  1  to  ground 
and  the  other  from  pin  2  to  ground.  The 
idea  is  to  pick  pairs  of  diodes  which  bring 
the  meter  needle  closest  to  the  mark,  thus 
having  exactly  the  same  voltage  drop  as 
closely  as  possible. 

Use  one  of  the  best-matched  pairs  of 
diodes  for  CR 1  and  CR3,  and  another 
well-matched  pair  for  CR2  and  CR4.  It  is 
not  necessary  that  CR1  and  CR2  be  alike,  or 
CR3  and  CR4,  though  it  will  do  no  harm. 
These  diodes  may  now  be  installed  in  the  rf 
probe,  observing  the  usual  soldering  precau- 
tions, and  the  probe  assembly  finished  up. 

The  meter  is  now  ready  to  be  calibrated. 

Range  Adjustment  and  Calibration 

Calibration  of  the  voltmeter  requires  a 
radio-frequency  signal  of  known  and  adjus- 
table leveL  If  you  can  borrow  a  good  signal 
generator  with  2  or  3V  rms  maximum 
output,  it  will  do  nicely.  An  uncalibrated 
signal  source  can  also  be  used  if  you  have 
some  way  of  measuring  its  output,  such  as  a 
calibrated  oscilloscope  or  another  rf  volt- 
meter. If  a  signal  generator  is  used,  be  sure 
to  consult  its  instruction  manual  to  find  out 


DECEMBER  1973 


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whether  it  delivers  its  rated  voltage  output 
into  a  matched  load  or  an  open  circuit.  Most 
generators  built  in  the  U.S.  deliver  rated 
voltage  into  a  5012  load.  Assuming  you  have 
such  a  generator,  attach  the  50£2  load  to  the 
rf  probe  and  connect  it  to  the  signal  genera- 
tor output. 

Switch  the  range  switch  to  0.03V.  With 
no  signal  input,  turn  the  zero  adjust  control 
to  zero  the  meter.  Put  in  the  0.03V  rms 
signal  at  a  frequency  of  a  few  megahertz  and 
adjust  gain  trimmer  R20  for  full  scale  meter 
deflection.  (If  full  scale  deflection  cannot  be 
obtained,  you  will  have  to  pick  a  higher  gain 
pair  of  FET's  Ql  and  Q2,  or  higher  gain 
transistors  Q3  and  Q4.)  Now  switch  to  the 
0.1  V  range  and,  with  no  signal  input,  again 
zero  the  meter.  Put  0.1  V  rms  into  the  probe 
and  adjust  trimmer  R21  for  full  scale  deflec- 
tion. On  each  range,  recheck  the  zero  after 
adjusting  the  gain  trimmer;  readjust  both  the 
zero  and  the  gain  as  necessary. 

Switch  to  0.3V  range  and  re-zero  the 
meter  with  no  input  signal.  Put  in  03V  rms 
and  note  the  meter  reading.  If  it  is  overfull 
scale,  R2  is  too  high.  Connect  a  variable 
resistor  of  several  megohms  maximum  resis- 
tance across  R2  and  adjust  it  for  full  scale 
deflection.  Remove  the  variable  resistor, 
check  its  resistance  with  an  ohmmeter  and 
connect  a  fixed  resistor  of  this  value  across 
R2  with  the  usual  soldering  precautions.  (If 
the  meter  reading  was  below  full  scale,  Rl  is 
too  high  and  must  be  shunted  down  in  the 
same  way,  but  this  is  not  likely.) 

Now  switch  to  IV  range,  re-zero  the 
meter,  and  put  1  V  rms  in,  The  meter  will 
probably  read  over  full  scale  again,  indi- 
cating that  R3  is  too  high.  Shunt  it  down  in 
the  same  way.  If  the  change  in  R3  is  more 
than  5%  or  so,  go  back  and  check  the  03V 
range  again. 

Switch  to  the  3V  range,  re-zero  the  meter 
and  put  3V  rms  in.  Shunt  down  R4  to  make 
the  meter  read  full  scale. 

Switch  to  the  10V  range  and  re-zero  the 
meter.  Put  in  10V  rms  (if  available)  and 
shunt  down  R5  as  necessary  for  full  scale 
reading.  If  your  rf  source  will  not  put  out 
this  much,  you  can  assume  that  the  meter 
scale  is  linear  on  this  range,  and  adjust  to 
make  the  meter  read  at  the  right  point  on 
the  scale  for  the  voltage  you  do  have. 


60 


73  MAGAZINE 


Close-up  of  the  recalibrated  meter  face.  Because  four  separate  scales  are  required,  a  large  meter  allows 
dtect  calibration  without  the  scales  crowding  together, 


The  meter  may  now  be  hand  calibrated. 
Starting  with  the  0.03V  range,  recheek  the 
zero  and  full  scale  readings  of  the  meter  as 
above,  then  put  in  levels  of  5,  10,  15,  etc., 
up  to  30  mV,  and  write  down  the  deflection 
on  the  original  meter  scale  for  each  input 
voltage.  Calibrate  each  higher  range  in  the 
same  way,  using  appropriate  steps  of  input 
voltage.  The  meter  scale  may  be  drawn  up 
by  any  of  the  usual  methods,  such  as  making 
an  enlarged  layout  and  photographing  it,  I 
drew  mine  up  actual  size,  with  a  ball  point 
pen  on  white  card  stock,  and  fastened  it  on 
the  back  side  of  the  original  scale  with 
rubber  cement.  The  finished  scale  is  shown 
in  the  photograph.  Since  the  scales  get  very 
non4inear  at  small  voltages,  separate  scales 
are  required  for  the  0,03V  and  0,1V  ranges. 
One  scale  can  be  made  to  do  for  the  0.3  and 
3V  ranges,  by  compromising  a  little,  and  one 
scale  for  the  1  and  10V  ranges. 

As  an  added  refinement,  you  can  tinker 
with  the  circuit  to  reduce  the  shift  in  meter 
zero  when  changing  ranges,  If  there  is  much 
shift  when  switching  between  0.3V  and  0 J  V 
ranges,  try  interchanging  transistors  Q3  and 
Q4,  If  the  shift  reverses  when  this  is  done,  a 
better  matched  pair  of  transistors  is  needed. 
If  it  stays  the  same,  a  tiny  adjustment  of 


resistors   R16  and  R17  for  better  match  is 
needed. 

If  the  zero  shifts  when  going  to  higher 

ranges,  adjust  the  resistors  R7  through  RIO 

as  necessary.  The  zero  shift  should  be  very 

small     if     they     are     made     equal     to    the 

corresponding  resistors  R2  through  R5. 

The  range  switch  may  now  be  installed  in 

its  permanent  location  and  the  assembly  of 

the  instrument  completed. 

Use  of  Other  Types  of  Semiconductors 

The  diodes  in  the  probe  should  be  silicon 
high  speed  types.  As  mentioned,  the  1N914 
is  quite  satisfactory.  It  is  made  by  several 
manufacturers  and  is  quite  inexpensive,  and 
there  seems  to  be  little  reason  to  use 
anything  else.  If  you  have  some  others  on 
hand  you  want  to  try,  they  should  have 
something  like  the  4  nanosecond  recovery 
time  of  the  1N914,  For  the  10V  maximum 
range  of  this  meter,  a  peak  inverse  rating  of 
40  or  50V  would  do;  the  100V  of  the 
1N9I4  gives  a  desirable  safety  margin.  The 
bias  diodes  CR5  and  CR6  should  be  the 
same  type  used  in  the  probe. 

The  2N4360  FET  is  a  P-channel  junction 
type,  It  is  made  by  Fairchild  and  may  not  be 
as  widely  available  as  those  of  some  other 
manufacturers.    Other  P-channel   unils  may 


DECEMBER  1973 


61 


APOLLO  PRODUCTS 


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be  used;  the  main  thing  is  to  get  or  select 
some  that  have  a  fairly  low  pinch-off  vol- 
tage, so  that  they  will  work  at  low  enough 
supply  voltage  in  the  given  circuit.  N-channel 
types  could  be  used  also,  but  this  would 
mean  that  the  following  transistors  Q3  and 
Q4  would  have  to  be  changed  from  NPN  to 
PNP  types,  and  the  polarity  of  all  the  diodes, 
the  meter  and  the  battery  would  have  to  be 
reversed. 

The  2N3565  is  a  very  high  gain  type;  the 
ones  in  my  meter  have  a  hFE  (beta)  of  275. 
This  again  is  a  Fairchild  device.  Other  NPN 
transistors  which  look  suitable  are  the 
2N3117,  2N3692,  2N37I 1,  2N4124  and  the 
2N5131.  A  browse  through  the  manufac- 
turers* catalogs  will  turn  up  others.  If  you 
should  change  the  circuit  to  use  PNP  types 
as  mentioned  above*  the  2N3965,  2N4062, 
2N4126  and  2N4250  are  some  of  the  pos- 
sibilities. You  could  get  by  with  less  beta  by 
using  a  more  sensitive  meter  than  1  mA,  or 
by  doing  without  the  0.03V  range;  this 
would  allow  many  more  silicon  types  to  be 
used.  (Dropping  that  lowest  range  would 
simplify  the  circuit  considerably  as  well.) 

Conclusion 

The  frequency  response  of  the  completed 
meter  was  measured  to  be  1  dB  down  on  the 
low  end  at  40  kHz,  At  the  upper  end,  it  was 
still  flat  at  216  MHz,  the  upper  limit  of  the 
available  signal  generator.  The  input  im- 
pedance of  the  probe  was  measured  with  an 
R-X  meter;  it  proved  to  be  4  pF  shunted  by 
a  resistance  of  30,00012  at  1  MHz.  At  higher 
frequencies,  the  capacitance  remained  4  pF, 
but  the  shunt  resistance  dropped  gradually, 
being  8,0000  at  30  MHz  and  1 000ft  at  200 
MHz. 

With  the  50O  load  attached  to  the  probe, 
the  meter  will  indicate  rf  power  from  a  few 
microwatts  up  to  2W  maxmimum.  (Power 
equals  E2/R,)  Without  the  50S2  load,  the 
probe  may  be  used  directly  on  sensitive 
circuitry,  provided  its  4  pF  capacitance  can 
be  allowed  for.  Thus  the  meter  will  be  found 
very  handy  for  working  on  nearly  all  solid- 
state  and  other  low  power  circuits. 

Many  thanks  to  Dave  Annett  WB6DBE 
for  taking  the  photographs,  and  to  Lloyd 
Provan  for  enlarging  them. 

.  .  .WA6NIL 


62 


73  MAGAZINE 


Bob  Manning  Kl  YSD 
Rye,  NH 


*e"GRJEENlE" 


The  Wayne  Green  Award,  or  Greenie, 
came  into  existence  in  much  the  same 
way  as  did  penicillin,  the  St.  Andreas  Fault 
and  me  —  by  sheer  accident! 

Recently,  an  obscure  and  nameless  ham 
with  the  solder-wasting,  foot-scarring  and 
improbable  talent  of  constructing  bread- 
boards with  a  propane  torch,  discovered  his 
solder  had  been  dropping  into  a  scrunched- 
up,  cast-off  TV  dinner  plate  secreted  under 
his  bench. 

When  -  after  several  pounds  had  accumu* 
lated  -  the  mass  was  removed  and  turned 
upright,  it  bore  not  only  an  amazing  resem- 
blance to  Wayne  Green  (dutch  boy  haircut, 
turtleneck  sweater  and  all),  but  two  em- 
bossed letters,  E  and  L,  from  the  plate  had 
been  reverse  fashioned  into  the  glop  some- 
how, making  a  passable  73*  Thus  the  Greenie 
was  bom! 

Its  destiny  was  to  be  awarded  to  the  ham 
with  the  best  -  or  most  unusual  -  shack. 

We  (the  awards  committee),  after  visiting 
hundreds  of  shacks,  were  gathered  in  the 
huge  8  x  10  ft  conference  room  to  decide 
who  should  receive  the  coveted  first  annual 
Wayne  Green  Shack  of  the  Year  Award  (no 
double  entendre  intended!). 

To  say  it  was  an  odd  assemblage  would  be 
putting  it  mildly.  It  was,  however,  fairly 
representative.  Wayne,  himself,  was  in  ab- 
sentia -  having  gone  off  to  fight  simul- 
taneous duels  with  the  editors  of  CQ  and 
QST (FCC  Proposals  at  300  meters). 

Katrina  of  course  was  there,  representing 
the  YLs.  Slightly  over  300  pounds  of  Fern- 


Lib  amateur  radio  operator,  Katrina  was  — 
to  say  the  least  —  imposing.  A  feminist  to 
the  last  ounce,  Katrina,  at  the  moment,  was 
banging  alternately  on  the  simulated  alabster 
(plywood)  table  (Wayne  spares  no  expense) 
and  thumping  Claude  Zister,  our  technical 
type,  on  his  emaciated  chest,  causing  him  to 
retch  violently  at  each  thump. 

Claude  isn't  a  bad  sort,  despite  the  fact 
that  he  and  the  slide  rule  he  kept  clutched  in 
his  bony  fist  were  of  unusually  similar 
stature  and  weight.  Only  guy  I  ever  knew 
who  made  Wally  Cox  and  Twiggy  look  like 
Minnesota  Fats  and  Mama  Cass  Elliot! 

"It's  gotta  be  a  YL  or  XYL  to  win  the 
award!"  bellowed  Katrina.  "You  male 
chauvinists  have  had  it  too  much  your  own 
way  for  too  long." 

"Balls!"  roared  Grunt  (at  least  I  think  his 
name  was  Grunt.  He  rarely  spoke  below  721 
dB  over  S-9  which,  when  we  first  met, 
numbed  my  eardrums  and  I  never  was  sure 
of  what  he'd  said  when  he'd  introduced 
himself). 

During  our  inspection  tour  he  yelled  into 
one  guy's  mike  so  loudly  and  so  excitedly 
that  he  bit  the  top  right  off  a  Shure  444. 
Grunt  was  the  representative  of  that  new 
breed  of  operation,  The  SuperHam!  You've 
undoubtedly  met  them  on  the  bands. 

The  SuperHam  comes  through,  on  the  air, 
as  a  fifty ish,  loudmouthed,  know-it-all  clot 
dedicated  to  the  proposition  that  only  he  \s 
created  equal  He  claims  squatters  rights  to 
his  frequency,  and  by  virtue  of  thirty- two 
series  paralleled  4-lOOOZ's  simply  opens  up 


DECEMBER  1973 


63 


and  takes  over  at  least  20  kHz  of  band 
width.  Faster  than  a  millisecond  VOX,  more 
powerful  than  the  law  allows,  able  to  stomp 
QRP  stations  with  a  single  belch.  Ooh  hoo! 
Look!  There  on  the  air!  it's  Aurora!  It's 
insane!  It's  SOOOOPPERHAAAAMM!!! 

"And  again  I  say  Balls!"  roared  Grunt, 
"It's  gotta  be  a  station  with  power,  power, 
P.O.W.E.R.  power  and  more  power!" 

At  this  point  our  secretary ,  Maggie  (the 
message  handler)  began  rummaging  through 
an  oversized  Samsonite  suitcase,  the  outside 
of  which  boasted  -  instead  of  travel 
decals  —  stick-on  message  check-off  sheets, 
HX  and  ARL  numbered  references,  "Wait  a 
minute,  I've  got  some  notes  here,"  she  said, 
scattering  message  forms  and  blanks  over  her 
shoulder,  the  table  and  the  floor, 

"Yeah!  Hold  it!"  chimed  in  Cecil,  the 
certificate  hunter,  performing  a  similar  act 
save  for  the  fact  that  he  was  strewing 
certificates  hither  and  yon.  (Funny,  I  never 
did  get  used  to  Cecil's  attire;  the  single 
breasted  oversized  WAS  certificate  for  a 
jacket  made  from  seersucker  was  bad.  The 
bell  bottoms  fashioned  from  quilted  CHC 
memorabilia  was  worse,  but  the  tie  that 
glowed  in  the  dark  showing  his  DXCC  made 
me  feel  like  someone  was  stepping  on  my 
throat.) 

From  the  corner,  Effram  -  our  CW 
operator  -     was    bleating,    "Didah    dididit, 

didah  dididit. " 

Looking  up  from  my  navel  (which,  in- 
cidentally, in  the  last  five  years  has  gone 
from  the  outward  type  to  the  inward  type), 
I  began  to  pound  my  gavel  for  order.  I,  as 
the  appliance  operator-klutz-lid  repre- 
sentative, was  the  chairman  of  this  motley 
group. 

"Order,  order!"  I  screamed  at  the  room, 
which  had  taken  on  the  appearance  of  a 
ticker  tape  parade  due  to  the  fact  that 
Maggie  and  Cecil  were  still  flinging  papers 
into  the  air,  Katrina  was  hollering  4YL,  YL, 
YL!".  Grunt  was  bellowing,  "Balls!  Power- 
power-power  I  tell  ya  -  ya  gotta  have 
power!"  and  Effram  was  driving  me  slightly 
off  my  rocker  with  that  "didah  dididit, 
didah  didit!"  It  sounded  like  a  Chinese 
auctioneer  with  a  cleft  palate  conducting  a 
sing-along  for  200  babbling  tambourine 
thumping  chimpanzees. 


Bang,  bang,  bang  went  the  gavel  as  I 
pounded  at  the  chaos.  Suddenly  I  felt  several 
sharp  pains  just  below  my  spleen  and  dis- 
covered Claude  poking  me  with  his  slide 
rule.  44Excuse  me,  sir,"  he  said,  "but  I 
believe  youVe  just  spilled  your  coffee  into 
your  lap." 

"Thank  God!"  I  exclaimed,  "I  thought  it 
was  something  else." 

Some  semblance  of  order  finally  arrived 
except  for  Effram  with  his  "didah  dididit" 
and  "dahdahdidah  dah  dahdidahdit." 

"Grunt,"  I  said,  "will  you  put  Effram  on 
break-in  and  tell  him  to  QRT." 

"Huh?  Whazzat,  boy?  You  gotta  speak 
up,  boy!  You  need  more  power.  More 
power,  I  say.  Power,  boy,  slap  the  ole  juice 
to  it  till  the  tubes  run  rosy  red  and  the 
transformer  fires  -  power,  boy,  power!" 

Thankfully,  Katrina  took  a  hand  and 
solved  the  problem  with  delicate  feminine 
expertise.  Clamping  onto  Effram'shand  con- 
taining a  soup  spoon  with  which  he  was 
tappy-tappy-tapping  something,  she  jammed 
both  spoon  and  hand  down  his  throat, 
coming  dangerously  close  to  his  liven  Then, 
in  what  seemed  to  be  a  single  motion,  she 
grabbed  Maggie's  oversized  attache  case,  and 
with  a  vicious  arced  swing  whomped  Grunt 
approximately  32  inches  above  his  ankles  - 
or  —  at  the  apex  of  his  V,  as  we  say  in  the 
trade, 

"Okay,"  1  continued,  "now  we  only  got 

this  one  trophy  to  give  away.  WeVe  seen  all 
sorts  of  shacks.  Suppose  we  use  the  process 
of  elimination?  I  think  we  can  eliminate  all 
the  Danish  Modern,  Colonial  and  home- 
antiqued  types,  right?  Any  other  elimi- 
nations? Raise  your  hands." 

A  sharp  shooting  pain  under  my  left  eye 
told  me  that  Claude  had  raised  his  hand  — 
replete  with  slide  rule  —  damn  near  turning 
me  into  a  cy clops, 

"I  think,"  said  Claude,  "that  we  can  also 
eliminte  the  Japanese  Contemporary  shack.  I 
mean,  after  all,  'Ladio  Shack?"  4Landom 
Rength  of  LG/81T  and  Xoger,  Loger  OM'  is 
a  bit  much;  besides,  the  autographed  8X10 
glossies  of  Sessue  Hayakawa-  and  Richard 
Loo  in  bamboo  frames?  PfuiiL  And  how 
many  operators  will  deliberately  live  on  the 
side  of  a  hill  so  they  can  erect  slanted 
inverted  vee's?" 


64 


73  MAGAZINE 


4  4* 


t*1 


"And  it  didn't  got  no  power  neither.  No 
balls  at  all."  chimed  in  a  slightly  falsetto 
Grunt,  assuming  a  cross4egged  protective 
pose  as  he  cast  a  suspicious  eye  at  Katrina. 

"Yeah,  and  it  was  all  commercial  He 
didn't  have  no  home  brew  stuff  any  where !" 
came  a  voice  from  under  the  table. 

"Who  the  hell  is  that?"  I  gasped,  as  a  pair 
of  hands  and  two  eyes  peered  over  the 
tabletop. 

Tis  I,  Marvin,  the  home  brew  specialist." 
:Whatinhell  are  ya  doin'  under  the  table, 
Marvin,  the  home  brew  specialist?" 

4Tm  building  a  voting  machine,"  Marvin 
replied,  piling  soldering  gun,  heat  sinks, 
dikes  and  assorted  other  tools  on  top  of  a 
stack  of  Maggie's  messages  and  Cecil's  certi- 
ficates. 

"Look,  old  boy,  I  think  I  soldered  my 
belt  buckle  to  a  table  hinge,  so  I'll  just  sit 
here,  okay?" 

"Fer  cripes  sakes.  Is  that  everybody?"  I 
said  —  glancing  around  the  room  and  under 
the  table  —  absently  noting  that  Marvin  had, 
indeed,  soldered  his  belt  buckle  to  the  table 
hinge . 

"I  believe,"  said  Claude,  manipulating  his 
slide  rule  back  and  forth  and  making  copious 
notes  on  a  seemingly  endless  sheet  of  fools- 
cap, "that  were  missing  one-point-three 
persons." 

"Whaddya  mean,  'one  point  three  per- 
sons'?" 

"Well,  Baltimore-Anchorage-Roanoke- 
Rochester-Yokahama  —  what  a  name  —  the 
20  meter,  quick  QSO  kook  was  captured  by 
an  A&P  manager  and  is  working  the  five 
items  or  less'  checkout  counter  around  the 
corner.  He  was  'Hi  there!  You're  5  and 
9  -  that's  a  dollar  9.80  see  you  latering'  to 
beat  the  band  the  last  time  I  saw  him." 

"Okay,"  I  said,  "That's  one  —  now  what's 
the  point  three? 

"Oh,  that's  Giggles-  You  can't  really  call 
him  a  full  ham.  I  don't  know  what  category 
he  falls  into.  He's  the  fruitcake  who  checks 
into  a  net  and  spends  the  next  45  minutes 
tripping  his  VOX  with  giggles." 

"I  know  the  type.  Thanks,  Claude." 

"Think  nothing  of  it,"  said  Claude, 
making  a  magnanimous  arm-sweeping  ges- 
ture, catching  me  across  the  bridge  of  the 
nose  with  that  goddam  ruler. 


"I  think  you  just  deviated  my  septum, 
vou  " 

"Didididit  didit"  "Didididit  didit"  came 
from  the  end  of  the  table, 

"Claude,  why  don't  you  go  down  and 
teach  semaphore  to  Effram  and  take  that 
mathematical  pogo  stick  with  you."  I  said, 
wiping  a  tear  from  my  eye  and  a  spot  of 
blood  from  my  nases. 

"Okay,  any  more  eliminations" 

Katrina  jumped  to  her  feet  {this  act  by  its 
sheer  spontaniety  caused  Grunt  to  explode 
backward  against  the  wall  —  not  an  easy  feat 
when  you're  in  a  September  Morn'  pose).  '  I 
think"  said  Katrina,  casting  a  threatening 
look  at  the  folded-up  Grunt,  "that  we  ought 
to  eliminate  that  Swedish  Convertible  shack 
also.  Really!  A  Myra  Breckenridge  receiver 
and  a  Chrstine  Jorgensen  transmitter.  That's 
carrying  synthesis  too  fan  No  knobs,  no 
meters  no  dials,  no  nuthin\  just  one  big 
switch  —  or  is  that  swish?" 

"And  it  didn't  got  no  power  at  all.  Ya 
gotta  have  oomph,  guts,  punch.  Ya  gotta 
have  ballsT*  said  Grunt. 

"And  that  thing  just  can't  be  made  -  no 
pun  intended  —  it  can't  be  made,"  said 
Marvin,  absently  rapping  an  if  coil  around 
his  athletic  finger  (the  one  that  can  make  a 
broad  jump!). 

"I  agree,"  said  Claude,  "the  absence  of  a 

ball   bearing  drive   mechanism    on    the  vfo 
renders    it    virtually    useless,    and    I    think 

Effram  will  agree  that  a  'marshmallow  key' 

for     limp     wrists     is     impractical.     Right, 

Effram?" 

"Didahdit  didahdit"  said  Effram. 

Just  then  a  "giggle  giggle"  came  from  the 
intercom, 

"Giggles,  will  you  get  the  hell  outta  the 
waiting  room,  quit  giggling  into  that  inter- 
com, and  join  us?" 

*4  Right,  Bob  —  giggle-giggle  —  but  ya 
know  I  sort  of  liked  that  'Liberal'  shack  we 
saw.  You  know  the  one  —  entire  place  be- 
decked hippie  style  with  flowers,  beads  and 
black  lights  using  a  Lysergic  25  receiver,  a 
Mary  Jane  transmitter  and  a  Horse  Ampli- 
fier —  hey,  and  the  wattmeter  labeled 
'Flower  Power'  really  IN  the  log  books 
called  a  'trip  sheet'  and  all  those  petitions. 
Like  the  one  petitioning  all  magazines  to 
include  a  supplement  to  their  "Who's  Who" 


DECEMBER  1973 


65 


It, 


«tj 


It 


columns  entitled  "Who  Dat?"and  that  jazzy 
antenna  —  wow  -  erected  in  the  form  of  a 
65  foot  peace  symbol  That's  today,  Bob!" 
Oh,  Lord!",  I  said. 
Charlie,  Charlie"  said  Maggie, 
'According  to  my  calculations,  the 
damned  thing  WON'T  WORK,  Giggles!"  said 
Claude. 

"Precisely!  It's  IN"  said  Giggles. 

"Balls!"  said  Grunt. 

"Do  I  record  all  this  talk  as  one  message 
or  can  I  count  each  quote  as  a  separate 
message?"  asked  Maggie. 

"Hey,  yeah!  And  do  I  get  a  certificate  for 
attending  this  thing?"  queried  Cecil. 

"Look,  you  band  of  three  toed  sloths, 
we're  here  to  hand  out 
this  —  this  -  this  —  ah  —  trophy.  Now  with 
the  Emmys  Oscars,  Gramrnys  and  all  the 
other  awards  handed  out,  its  pretty  hard  to 
go  through  a  lifetime  without  receiving  an 
ward!" 

"You're  right,  Bob.  I  know  a  guy  who  got 
an  award  for  never  having  received  an 
award!" 

4tLook,  Marvin,"  I  said.  "If  you  can 
unsolder  your  belt  buckle  without  doing 
yourself  any  permanent  genetic  injury,  will 
you  get  up  above  the  edge  of  the  table,  and 
we'll  get  this  thing  settled." 

"Now,"  I  began,  "as  I  see  it,  in  order  to 
please  everyone,  we've  got  to  give  it  to  a  YL 
running  in  excess  of  10  KW  on  CW  for 
quickie  QSO's  on  20  meters  who  receives  an 
occasional  BPL,  has  a  good  standing  in  the 
CHC  and  has  built  her  entire  shack  in  Early 
Halloween  or  Contemporary  Junkyard  all  by 
herself  and  can  giggle  her  VOX  on  phone, 
right?" 

"Listen,  BOY,  are  you  out  of  your 
cotton- pickin'  fumble- fingered  Donald 
Duck-squawking  mind?"  said  Grunt.  "There 
ain't  no  such  animal!" 

"WHOOMPP!!!"  Katrina  struck  again, 
knocking  Grunt  sidewise  into  Effram,  into 
Claude,  into  Giggles  and  on  top  of  Marvin. 

From  the  resulting  jumbled  mass,  horrible 
screams  emerged  and  Grunt  made  a  spectacu- 
lar 7  foot  leap  into  the  air, 

"Giggle,  giggle,"  said  Giggles. 

"What  now?"  I  said  to  a  breathless, 
open-mouthed  Katrina. 


"Fer  crissakes,  Katrina,  said  a  near 
hysterical  Marvin.  "What'd  ya  go  and  do  that 
for?  Now  I  got  my  belt  buckle  soldered  to 
Effram 's  spoon  and  Claude's  slide  rule,  1 
think  I  branded  Grunt  with  a  Texas  B  bar  S 
and  Effram  is  about  to  choke!"  As  if  to 
emphasize  this  point,  we  could  hear  a  tap 
tap  tap  thump  thump  thump  tap  tap  tap  as 
Effram  rapped  out  an  SOS  on  the  table. 

"Giggle,  giggle." 

"Oh  Lord!" 

We  waded  into  a  knotted  mass  of  humani- 
ty. Calling  on  my  old  Boy  Scout  training  we 
untangled  everything  but  the  spoon  and  slide 
rule  which  we  left  dangling  from  Marvin's 
belt  buckle, 

'Hey,  you  damned  fools!"  hollered 
Grunt  from  his  position  astride  the  water 
cooler*  "We  can  forget  the  whole  thing  now. 
That  dummy's  soldering  iron  just  melted  the 
statue.  Ain't  no  more  Greenie.  Ain't  no 
award  this  year,  unless  you're  planning  on 
giving  'em  a  melted  lead  tea  cozy  or  one 
helluva  heavy  frisbee!" 

"Oh,  Lord,"  I  said.  "Well,  Wayne's  always 
saying  get  the  lead  out.  " 

"Giggle,  giggle." 

"Maybe  we  could  build  a  parabolic  dish 
out  of  it,"  said  Marvin. 

"Put  a  number  on  it  so  I  can  log  it."  said 
Maggie, 

"Hell,  letrs  stamp  BPL  on  it  and  GIVE  it 
to  Maggie  "  said  Katrina. 

"Can  I  keep  it  as  a  certificate  "  asked 
Cecil. 

With  extreme  calm,  I  walked  to  the 
window  and  threw  the  melted  glob,  my 
gavel,  the  buckle-spoon-ruler  combination 
and  two  handfuls  of  messages  and  certifi- 
cates into  the  street.  Then,  as  an  after- 
thought, I  picked  up  the  still  "didididit 
did  it  -  d  id  id  id  i  didif'ing  Effram  and  flung 
him  after  his  spoon,  receiving  the  ultimated 
satisfaction  of  hearing  him  speak  his  first 
real  word  "HHEELLLLLLLPP!!!" 
Oh,  Lord!" 
Giggle,  giggle," 

Balls!"  said  Grunt,  Katrina,  Maggie, 
Marvin,  Cecil,  Giggles  and  I  in  unison.  And, 
from  the  sidewalk,  we  heard  "didahdit"  thus 
putting  an  epitaph  to  the  Greenie. 

,,,K1YSD 


t*j 


i*j 


** 


66 


73  MAGAZINE 


John  J.  Schultz  W2EEY 
1829  Cornelia  Street 
Brooklyn  NY  11227 


RAPID  RECEIVER 


CONTROL  SWITCHING 


A  simple  circuit  that  provides  ^touch" 
s  wi  tch  ing  of  va  ri  o  it  s  re  c  e  it)  e  r  fu  net  ions  for 
more  rapid  and  easier  DX-hunting. 


Amateurs  who  are  really  interested  in 
improving  their  receiving  setup  for 
DX-hunting  or  other  purposes,  usually  end 
up  with  a  receiver  containing  many  modifi- 
cations. These  modifications,  such  as  selec- 
tivity and  preamplifier  devices,  may  either 
be  internally  mounted  in  the  receiver  or 
contained  in  outboard  enclosures*  Ail  the 
modifications  may  well  prove  their  value  in 
improving  receiver  performance,  but  one 
problem  which  usually  develops  is  the  con- 
trol of  the  controls  for  the  accessory  cir- 
cuits. The  phrase  "control  of  the  controls'* 
may  sound  a  bit  strange,  but  one  of  the 
greatest  problems  in  DX-hunting  with  a 
receiver  is  to  be  able  to  concentrate  on  the 
tuning  itself  and  not  be  distracted  by  having 
to  look  away  to  see  the  setting  of  other 
controls  or,  in  fact,  to  operate  other  con- 
trols. 

The  simple  circuit  described  in  this  article 
allows  one  to  activate  by  touch  control  any 
receiver  function  which  is  switch-operated. 
The  touch  plates  for  different  functions  can 
be  grouped  around  the  receiver's  main  tun- 
ing knob,  as  shown  in  Fig,  1,  so  that  one 
need  not  remove  one's  hand  from  the  tuning 
knob  in  order  to  reach  any  touch  plate.  The 
choice  of  functions  which  one  may  wish  to 
control  in  this  manner  is  a  matter  of 
individual  choice,  but  usually  it  will  be  such 
functions  as  i-f  bandwidth,  audio  selectivity, 
sideband  selection,  etc.  Placing  a  finger  on  a 


touch  plate  will  activate  the  function  for 
which  that  touch  circuit  is  wired  for  a  time 
period  of  5  —  10  seconds,  then  the  circuit 
function  will  automatically  revert  to  its 
original  state.  This  method  of  operation  was 
chosen  so  that  manual  override  of  the  touch 
circuit  would  be  possible  at  any  time  by 
using  the  regular  control  switch  for  a  recei- 
ver function.  Also,  the  time  period  chosen 


SIDEBAND  SELECTION 


AUDIO  SELECTIVITY 


t-F 
SELECTIVITY 


Fig.  L  Possible  touch  plate  arrangement  on  the 
front  panel  of  a  receiver  around  the  main  tuning 
knob. 

allows  sufficient  time  to  operate  the  regular 
control  switch  if  it  is  desired  to  retain  the 
function  that  was  activated  and  yet  the  time 
period  is  short  enough  so  that,  if  the  circuit 
function  chosen  proves  not  to  be  useful,  it 
will  drop  out  before  too  much  reception  is 
lost  or  distorted. 


DECEMBER  1973 


67 


^ 


^ 


I 


-o) 


CONTACTS 

WIRED 

TO 

RECEIVER 

FUNCTION 

CONTROL 

SWITCH 


O- 

TOUCH 
PLATE 


IOK 

AW 


200-n.  COIL 

[KNIGHT  KNlO5-2C-i20 

Oft  SIM^AR) 


1000 


+(12-20)  VDC 


BOTTOM  VIEW 


Fig,  2.  Schematic  of  touch -control  switching  unit 
utilizing  3N60  or  similar  SCR,  IK  potentiometer 
controls  sensitivity. 

Circuit 

Figure  2  shows  the  simple  circuit  of  the 
touch  control  unit.  It  consists  of  a  basic  SCR 
switching  circuit  utilizing  a  3N60,  or  any 
similar  SCR.  Placing  one's  finger  on  the 
touch  plate  will  provide  enough  pickup 
voltage  at  the  cathode  gate  of  the  SCR  so 
that  the  SCR  will  fire  and  the  relay  coil  will 
be  energized.  Any  relay  can  be  used  which 
has  a  100— 200£2  coil  and  does  not  require 
more  than  about  100  mA  operating  current. 
A  1  KQ  potentiometer  placed  between  the 
anode  gate  and  the  power  supply  side  of  the 
relay  coil  can  be  used  to  regulate  the 
sensitivity  of  the  touch  plate.  Normally,  the 
SCR  when  fired  would  continue  to  conduct 
indefinitely,  unless  a  switch  were  provided 
to  "unlatch"  the  SCR.  To  provide  a  means 
for  the  SCR  to  automatically  stop  conduc- 
ting after  a  definite  time  period,  power  to 
the  SCR  is  supplied  via  an  RC  network 
consisting  of  a  220fi  resistor  and  1,000  jiF 
capacitor.  Once  the  SCR  has  fired  it  will 
continue  to  conduct  until  the  charge  on  the 
capacitor  decreases  to  the  point  where 
enough  current  does  not  flow  through  the 
SCR  to  allow  it  to  remain  in  a  conducting 
state.  When  this  point  is  reached,  the  SCR 
will  stop  conducting.  Depending  upon  the 
characteristics  of  the  relay  used,  the  relay 
will  be  de-energized  shortly  before  or  at  the 


time  the  SCR  stops  conducting.  Once  the 
SCR  stops  conducting,  the  1,000  juF  capaci- 
tor will  again  charge  via  the  200^2  resistor. 
The  value  of  the  components  for  the  RC 
network  can  be  chosen  as  desired  for  the 
time  delay  desired- 
Construction 

It  is  suggested  that  the  circuit  first  be 
"breadboarded"  so  one  can  determine  the 
proper  components  to  use  for  the  RC 
network  for  the  time  delay  desired.  The 
value  of  the  components  will  vary  depending 
upon  the  relay  used  and  the  supply  voltage. 
The  final  unit  can  be  assembled  on  a  piece  of 
perforated  board  stock  and  mounted  in  any 
convenient  location  in  the  receiver.  The 
supply  voltage  need  not  come  from  a  well- 
filtered  source  and  can  be  taken  from  any 
available  source  in  the  receiver.  If  necessary, 
a  simple  half-way  rectifier  circuit  from  the 
filament  line  can  be  used. 

The  most  difficult  aspect  of  the  construc- 
tion of  the  unit  will  probably  involve  that 
for  the  touch  plate  itself,  since  it  involves 
the  question  of  to  what  degree  one  is  willing 
to  modify  the  front  panel  of  a  receiver.  The 
area  of  the  touch  plate  need  be  no  larger 
than  that  of  a  penny,  or  dime  coin.  Probably 
the  best  way  to  try  the  circuit  for  its 
usefulness,  in  fact,  is  to  use  something  like  a 


TOUCH  PLATE 


SECTION  OF  RECEIVER  FRONT  PANEL 
FRONT  VIEW 


HOLE  FOR  NQ.  30  WIRE 


NO.  30  AWG 
ENAMELED  WIRE 


METAL  PLATE 


FRONT 
PANEL 


INSULATING 
MATERIAL 


SOLDER 


TOP  VfEW 


Fig,   3.   Details  of  construction  of  a   touch  plate 
which  can  be  mounted  on  a  receiver  front  panel. 


68 


73  MAGAZINE 


penny  coin  with  a  wire  soldered  to  it  as  the 
touch  plate.  The  coin  can  be  placed  on  the 
receiver  front  panel  near  the  tuning  knob  by 
means  of  double-adhesive  backed  tape  and 
the  wire  from  the  coin  run  under  or  above 
the  front  panel.  A  more  permanent  and  far 
neater  installation  can  be  made  for  the  touch 
plate,  as  shown  in  Fig,  3,  Any  piece  of  metal 
sheet  about  the  area  size  of  a  penny  (not 
necessarily  a  round  shape)  is  glued  to  the 
receiver  front  panel  with  an  insulated  back- 
ing of  tape  or  other  material.  An  extremely 
small  hole  is  then  drilled  through  the  metal 
plate  and  the  front  panel  just  large  enough 
to  pass  size  #30  or  smaller  enameled  magnet 
wire.  The  end  of  the  wire  is  touch-soldered 
to  the  metal  plate.  In  this  way,  if  the  metal 
plate  is  removed  later,  the  very  small  drilled 
hole  can  easily  be  covered  with  touch-up 
paint,  or  other  material. 

The  wiring  of  the  relay  contacts  depends 
upon  the  control  switch  wiring  in  a  given 
receiver.  In  most  cases  where  simple  on-off 
type  control  functions  are  involved,  the 
relay  contacts  can  simply  be  wired  in  parallel 
with  the  toggle  switch  contacts.  In  more 
complicated  situations,  as  for  instance  when 
a  multiple  position  rotary  switch  is  used  to 
set  the  receiver  selectivity,  the  relay  contacts 
must  be  wired  across  those  positions  of  the 
switch  for  the  two  selectivity  positions  it  is 
desired  to  alternate  between  using  the  touch 
switching.  A  study  of  the  schematic  for  a 
specific  receiver  will  reveal  many  useful  ways 
in  which  the  relay  contacts  can  be  wired  into 
various  control  switches. 

Summary 

Touch  switching  of  the  most  frequently 
used  switch-type  receiver  controls  can  add  a 
great  deal  of  convenience  to  receiver  tuning, 
especially  under  circumstances  such  as 
DX-hunting  and  contest  work,  where  rapid 
control  of  various  receiver  functions  is  de- 
sired. Although  touch  switching  is  probably 
not  the  ultimate  answer,  it  is  at  least  a  step 
in  the  direction  of  solving  one  of  the  major 
design  faults  with  most  receivers.  That  de- 
sign fault,  of  course,  is  the  grouping  and 
nature  of  the  controls  for  receiver  functions 
not    being    really    operator-engineered    for 

rapid  utilization. 

. .  .W2EEY 


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130:  N.   BROADWAY        ATV    Research        DAKOTA  CITY    NEiR.   6873) 


WHY  FIGHT  QRM? 

Copy  code  through 
the  Gf*M  with  s  NEW 
DE-101  Stgaal  Div 
crimmator.  Built  in  ac 
Supply,  f  actory 
tuned,  and  a  one  year 
warranty.  S 29. 95  plus 
$2.00  shipping.  Ala- 
DYNAMIC  ELECTRONICS  IKCbama      residents     add 

Box  1131    Decatur  AL    35601        5%  tax. 


DECEMBER  1973 


69 


NEW!! 


o 


I***   Ml 


OTRCTF 


I  \  f'-tn  o  *r*  ire 


>u 


instant  access  to  450  from  144 


Now  .  .  *  SBE  opens  up  a  new  high  speed 
route  that  leads  to  instant  450MHz  operation 
from  any  2  meter  transceiver!  Rev  up — 
switch  in  the  exclusive  SBE,  SB-450TRC 
"Clover-leaf" — arrive  instantly  on  450!  Re- 
turn at  will! 

Installation  couldn't  be  more  simple.  Out- 
wardly, "Cloverleaf"  is  a  small  black  box 
that  connects  between  your  existing  144 
MHz  FM  transceiver  and  its  antenna,  also 
to  the  microphone  and  car  12  volt  battery. 
You  plug  the  450MHz  antenna  into  another 
receptable  provided.  SB-450TRC  has  no  ex- 
ternal tuning,  no  controls  other  than  a  switch 
that  allows  instant  shift  between  the  144 
and  450MHz  ranges.  No  mods  are  neces- 
sary. Your  existing  144MHz  transceiver  re- 
mains intact. 

Transmitter-wise,  SBE  "Cloverleaf"  is  en- 
tirely passive — draws  no  DC  power  yet  de- 
livers 40%  of  the  RF  drive  at  three  times 
the  frequency.  Example:  4  watts  out  on  450 
MHz  for  10  watts  drive  on  2  meters.  This 
high  efficiency  frequency  multiplication  is 
accomplished  by  a  power  varactor  diode  in 
conjunction  with  multiple  high  Q  tuned  cir- 
cuits. The  450MHz  output  is  of  course  fre- 
quency modulated;  overawing,  due  to  fre- 


quency multiplication,  being  compensated 
by  a  fixed  pad  in  the  microphone  circuit 
within  the  unit 

Receiver-wise,  "Cloverleaf1  has  a  front  end 
with  unity  conversion  gain  that  converts 
450MHz  band  signals  to  l-F  frequencies  cor- 
responding to  144MHz  channels.  Limlter, 
discriminator,  output  audio  and  loud 
speaker  in  the  2  meter  transceiver  continue 
to  function  in  the  usual  manner. 

Mobile  wise,  this  all-solid-state  transceiver 
is  ideal— a  compact  box  that  can  mount 
wherever  space  is  available.  "Cloverleaf 
current  drain  is  negligible* 

Price-wise,  this  SBE  high  value/perform- 
ance breakthrough  represents  worthwhile 
savings  over  the  cost  of  a  complete  450MHz 
transceiver  with  comparable  characteristics. 
Truly,  SBE  has  done  it  again! 


LINEAR  SYSTEMS,  INC,  220  Airport  Boulevard,  Watsonvilte,  Calif.  95076 


-Unit 

with 

covers 

removed 


Hans  E.  Weber  WA6QJU 
4040  Canyon  Dell  Dr. 
Altadena  CA  91001 


NCREAS 
YOUR  SSB 

EFFICIENCY 


add  talk  power  to  your  signal 


The  QRP  people,  like  me,  have  two  ends 
to  improve  their  efficiency.  One  is  the 
antenna,  the  other  is  the  signal  to  be 
transmitted.  Using  SSB  in  the  first  place 
makes  the  station  highly  efficient,  A  good 
antenna  system  brings  more  gain  than  doub- 
ling or  tripling  the  PA  power. 

How  about  the  intelligence  —  the  speech? 
Its  average  modulating  performance  is  as  bad 
as  using  a  kilowatt  with  a  poor  antenna.  To 
improve  this,  we  first  have  to  remove  the 
spikes,"  causing  a  low  average  modulation 
level  or  worse  —  overmodulation  (trouble  — 
TVI,  RFI  and  other  cTs")-  Second,  we  have 
to  compensate  somehow  for  our  inability  to 
keep  the  volume  at  a  steady  level- 
After  a  feasibility  study,  I  ended  up  with 
the  following  solution  (I  had  better  say 
"we,"  because  Hank  Giunta  and  Jerry  Stuart 
were  a  major  support  with  positive  criticism, 


-  ** 


Table  1,  Technical  Data 
Input  mV   Output  mV   Gain   Frequency  Response: 


5 

130 

26 

100  mV  input: 

10 

260 

26 

0-  2kHz  100% 

20 

460 

23 

2.7  kHz  87.5% 

30 

520 

17 

3.2  kHz  75% 

60 

600 

10 

4.4  kHz  50%  of  gain 

150H 

700 

4.7 

300 

800 

2.7 

500 

850 

1.7 

DECEMBER  1973 

and  enthusiastic  advice.  I  hereby  thank  both 

of  them). 


+  9  TO  IS 
VOC 


Hl-Z 
MIKE 


(—(output 


RTT>- 


■^  RT.T. 


Si -ANY  SiOlOOES 
IC-BURR  BROWN  1506, 

FAIRCHILO  709  or  tquiv 
01-  ANY  Si  NPN  TRANSISTOR 

Fig.  1.  Schematic,  Si:  any  Si  diodes;  IC:  Burr 
Brown  1506  or  Fairchild  709  or  equivalent;  X^: 
any  Si  NPN  transistor;  PS:  +  and  -  9-15  V  dc. 

This  unit  is  in  use  as  an  "in-line"  micro- 
phone amplifier  and  has  given  me  a  10  to  20 
dB  "gain"  from  the  receiving  station  for  my 
HW-100  transceiver. 

.  -  .WA6QJU 


71 


■■^ta- 


mm 


ttCiJill    CllniU 


ifttttici 


Down  to  $429,95.  .  The  FM-27B  Transceiver 
During  Clegg's  1-Month  Factory  Authorized  Holiday  Sale! 


CHECK  THESE  SPECIFICATIONS 

GENERAL 
POWER  REQUIREMENTS:  12  to  14  VDC 

Current  Consumption  at  13.5  VDC: 

Receive:  4  amps  squelched,  1.2  amps  unsquelched* 

Transmit:  6  amps  max. 
DIMENSIONS:  7  3/8"  n  3  1/2"  x  9  1/4"  deep;  4  lbs. 

net  weight* 

RECEIVER 

TUNING  RANGE:  146.00  to  148,00  MHz,  continu- 
ously tuneable  with  reset  capability  of  approx. 
1    KHz  to  any  frequency  in  range. 

SENSITIVITY:  .35  m*  max.  for  20  db  quieting;  Ijjv 
for  reliable  squelch  action. 

SELECTIVITY:  11  KHz  at  3  db;  Less  than  30  KHz  at 
70  db.  Adjacent  (30  KHz  spaced)  channel  rejection 
more  than  70  db. 

AUDIO  OUTPUT:  2.0  watts  {mini  at  less  than  10% 
THD  into  internal  or  external  ohm  speaker. 

TRANSMITTER 
TUNING     RANGE     AND    CONTROLS;     Same    as 

RECEIVER. 
POWER  OUTPUT:  25  watts  Min,  into  50  ohm  load. 

P/A  transistor  protected  for  infinite  VSWR. 
MODULATION:   Internally  adjustable  up  to  10  KHz 

deviation  and  up  to  12  db  peak  clipping. 


During  December  only,  you  can  save 
$50.00  on  the  purchase  of  THE  2-meter 
rig,  the  Clegg  FM-27B.  The  only  2-meter 
transceiver  with  any  combination  of  trans- 
mit or  receive  frequency  from  146  to  148 
MHz,  the  FM  27B  needs  NO  ADDITIONAL 
CRYSTALS.  It  gives  you  built-in  total 
coverage,  reliability,  and  dependable  per* 
formance*  Take  advantage  of  this  one- 
month  factory  authorized  special  and  start 
1974  with  Clegg's  2-meter  leader.  Act  today. 
Call  us  now  so  we  can  wish  you  a  happy 
holiday  or  give  you  more  information. 


MERRY 


CHRISTMAS 


Etectronix    Sales 


23044  CRENSHAW  BLVD.,  TORRANCE,  CALIF.  90505 

Phone  (213)  5344456  or  5344402 

ALSO  AMERICAN  EXPRESS 
CLOSED  SUNDAYS  &  MONDAYS 


BankAmericahq 


IDENTIFY  THOS 
UNMARKED 


Richard  McMahon  WA6ICU 
20733  Burbank  BL 
Woodland  Hills  CA  91364 


You  can't  pick  up  a  ham  magazine  or 
handbook  nowadays  without  finding 
numerous  articles  on  various  pieces  of  ham 
gear  utilizing  integrated  circuits.  The  trend  is 
inevitable.  ICs  are  inexpensive,  require  less 
building  time  and  can  pack  numerous  cir- 
cuitry into  no  space  at  all.  They  are  practi- 
cally indispensable  for  building  keyers,  cali- 
brators, converters,  counters,  amplifiers  and 
signal  generators. 

There  are  basically  two  types  of  ICs  on 
the  market  today 9  digital  and  linear  ICs. 
Digital  ICs,  as  the  name  implies  operate  on  a 
digital  system;  i.e.,  ON  or  OFF  like  a 
common  switch.  This  article  will  deal  mainly 
with  the  digital  IC  as  it  is  more  prevalent  on 
today's  market  and  adapts  readily  to  testing. 
A  theoretical  description  of  ICs  is  beyond 
the  scope  of  this  article  but  can  be  found  in 
past  articles.  (For  example,  "Digital  Logic 
Devices;'  N.  Pos  WA6KGP,  QST  July  1968  J 
Also,  Motorola,  RCA  and  International  Rec- 
tifier IC  manuals  give  easily  understandable 
theory. 

Since  digital  ICs  are  basically  switches, 
they  can  be  tested  as  such  to  determine  their 
condition.  Testing  ICs  prior  to  "plugging 
them  in* '  can  be  well  worth  while  as  one  bad 
IC  can  damage  others  in  the  circuitry.  Digital 
ICs  are  usually  used  in  groups  of  three  or 
more  in  many  circuits  so  that  each  should  be 
proved  satisfactory  before  hooking  them  all 
together  and  throwing  the  switch. 


INPUT 


OUTPUT 


Linear  ICs  on  the  other  hand  are  analog 
devices.  A  linear  IC  chip  is  made  up  to 
provide  internal  biasing  and  steering  diode 
circuits.  These  devices  are  readily  used  as 
AF-IF-RF  amplifiers,  discriminators,  voltage 
regulators  and  balanced  modulators  with  a 
minimum  number  of  external  components 
required.  Testing  a  linear  IC  therefore  re- 
quires much  more  elaborate  test  gear  to 
check  it  out  just  as  complete  checkout  of  a 
tube  or  transistor  requires  gain,  leakage, 
frequency  response,  distortion  and  other 
such  tests. 


Fortunately  most  linear  IC  circuits  utilize 
only  one  IC  or  at  least  the  IC  circuits  can  be 
isolated  from  each  other.  Therefore,  linear 
ICs  can  be  checked  by  insertion  in  the  actual 
circuit  with  input  and  output  parameters 
measured  without  chance  of  ruining  another 
IC  in  the  circuit. 

While  testing  linear  ICs  is  not  covered  in 
this  article,  the  identification  feature  of  this 
article  works  just  as  well  for  either  type. 

Both  types  of  ICs  are  readily  available  to 
anyone  who  has  access  to  surplus  flyers, 
electronic  house  catalogs  or  ham  magazines, 
Outfits  like  TAB,  Polypaks,  Radio  Shack 
and  Meshna  sell  ICs  one  at  a  time  to  your 
requirements  or  in  baskets  of  a  dozen  or 
more  mixed  ICs  for  the  price  of  a  six  pack. 


OR  GATE 

(OUTPUT  1  IF  AN V 

INPUT   1) 


STRAtGHT  AMPLIFIER 


AND  GATE 
[OUTPUT  IIP  ALL 

INPUTS  II 


INPUT 


OUTPUT 


NOR  GATE 

IOUTPUT  T  UNLESS 

ANV  INPUT  II 


INVERTING  AMPLIFIER 


Fig.  1.  IC  Symbols. 


NANDGATE 

(OUTPUT  I  UNLESS 

ALL  INPUTS  11 


DECEMBER  1973 


73 


This  latter  method  is  the  obvious  way  to  get 
started  in  ICs. 

Identification 

The  first  thing  you  have  to  do  when  you 
get  your  bag  of  bargain  ICs  is  to  figure  out 
what  they  are.  (Ever  try  to  use  a  tube  with 
no  number  on  it?)  Sometimes  this  may  be 
easy  if  the  IC  comes  with  some  descriptive 
literature  telling  what  it  is,  its  pin  connec- 
tions and  ratings.  More  often  than  not, 
though,  you  11  just  get  the  IC  and  it  may  or 
may  not  have  some  letters,  numbers  or  both 
on  it  along  with  maybe  the  manufacturer's 
name  or  trademark.  If  you  get  any  with  no 
markings  at  all,  deep  six  them  as  they  aren't 
worth  the  effort,  With  the  number  and 
manufacturer  pinned  down,  merely  drop  a 
card  to  the  manufacturer  and  most  will  be 
glad  to  send  you  a  description  of  the  device. 

If  only  letters  and  numbers  appear  on  the 
device,  you're  in  for  slightly  more  work. 
Check  the  prefixes  listed  on  Table  1  and  see 
if  you  can  match  your  device  number  with 
one  on  the  chart.  (You'll  note  some  prefixes 
are  used  by  more  than  one  manufacturer  so 
check  entire  list.)  If  this  works,  again  write 
manufacturer.  If  not,  check  some  IC  replace- 
ment guides  like  Motorola's  HEP,  RCA*s  SK 
series  or  International  Rectifier's  IC  guide  to 
see  if  you  can  uncover  the  rascal's  identity. 
If  all  else  fails,  you  can  try  to  obtain  a  copy 


SET 


CLEAR 


LOP 

J*K  (CLOCKED) 
FLIP*  FLOP 

preset"           1 

OUTPUT 

SET 

OUTPUT 

TOGGLE 

COMPLEMENT 

CLEAR 

COMPLEMENT 

OF  OUTPUT 

PRECLEAR- 

— - 

1 

OF  OUTPUT 

IF  THE 

SET 

INPUT 

IS 

AND  THE 

CLEAR 

INPUT 

IS 

THE 

OUTPUT 

WILL 

T±T 

^r 

NOT 

CHANGE 

STATE 

^ 

+ 

GOTO 
THE 

STATE 

■i- 

■ 

GOTO 
THE 

+ 
STATE 

+ 

+ 

GOTO 
THE 

STATE 

IF  THE 

SET 

INPUT 

IS 


AND  THE 
CLEAR 

INPUT 
IS 


+ 


-  +1 


AND  THE 
TOGGLE 
IS 


+ 


u 


+1 


+ 


1 


THE 
OUTPUT 

WILL 


CHANGE  TO 
THE  OTHER 
STATE 


GO  TO 
THE 

STATE 


GOTO 
THE 

+ 
STATE 


1 


WOT 
CHANGE 
STATE 


Fig.  2,  IC  flip-flop  symbols. 


of  the  latest  Electronic  Design  News 
Semiconductor  Annual  which  seems  to  list 
them  all.  Again  remember  what  you  paid  for 
these  devices  and  decide  how  much  effort 
they're     worth. 

Testing 

Now,  assuming  you've  found  out  what  it 
is  and  its  pin  connections,  you're  ready  to 
check  it  out*  For  all  types,  first  set  up 
selector  switches  for  Vcc  and  ground  con- 
nections. (The  two  voltage  ON-OFF  switches 
should  be  left  off  until  the  setup  is  con- 
firmed.) Set  the  output  pin  to  the  "meter" 
position    and    leave    all    others    set    to   the 

"OPEN'"  position  until  you're  ready  to  test. 

For  AND  (NAND)  and  OR  (NOR)  gates, 
see  Fig.  1  for  normal  operation  and  set  the 
inputs  of  the  gate  to  either  "GROUND"  or 
"1.5  V"  depending  on  the  type  of  gate.  Then 
switch  "ON"  the  4.5V  and  1.5V  supplies. 
Observe  the  meter  for  pickup  or  dropout  of 
the  output  signal.  Try  all  possible  input 
combinations  and  make  sure  the  output 
responds  as  required. 

Many  ICs  contain  two  or  more  discrete 
circuits  in  one  package  so  be  sure  to  check 
all  of  them. 

To  check  an  amplifier  (called  "buffer") 
apply  input  signals  and  observe  the  output 
for  straight  through  operation  or  inversion 
(output  opposite  input). 

Flip-flops  will  be  the  most  involved  ICs  to 
check  out  due  to  their  varied  functions. 
Truth  tables  for  the  two  most  common  type 
of  flip-flops,  clocked  J-K  and  R-S,  are  shown 
in  Fig,  2.  These  are  only  typical  truth  tables 
so  check  the  one  for  your  particular  device. 

Understand  the  tables  thoroughly  prior  to 
attempting  to  check  a  flip-flop  as  they  can 
be  ruined  quickly  especially  if  a  positive 
voltage  is  inadvertently  applied  to  an  output 
that  is  in  an  OFF  or  DOWN  state. 

The  R-S  type  merely  requires  setting  up 
the  various  input  combinations  and  observ- 
ing the  output  Q  or  Q  (Q  not)  to  see  that  it 
follows  the  truth  table.  When  checking 
flip-flops,  always  set  the  unused  output  (the 
one  you're  not  metering)  to  "OPEN"  as 
grounding  either  output  will  prevent  flip- 
flop  operation. 

The  J-K  type  is  checked  similarly  except 
nothing  happens  to  change  the  output  state 


74 


73  MAGAZINE 


I 


ONC 


SW2-SWI3 


47  K 


SWf5 


15  v 


i 


— oswy- 


SWI6 


1 


4  5V  — 


ffl 


I 


SWI7 

■ 


>£□ 


SW7  *- 


IK 

fvWf 


/77 


See  text 


METER- 


♦  swa 


SELECTOR 
SWITCHES 


■SW9 
SWIO 

♦  SWU 
SWI2 

>SWt3 


Fig,  3.  IC  tester  schematic.  Ml- 100  {±A,  SOI  -10  pin  IC  socket,  S02-14pin  IC  socket,  SW1  thru 
14-1  pole  6pos.  rotary,  SW15t  16-SPST  toggle,  IC-fJL  914,  SW17-N.O.  pushbutton. 


until  a  signal  is  applied  to  and  removed  from 
the  clocked  input  (usually  labeled  "T")- 
Therefore,  the  various  input  conditions  are 
preset  one  at  a  time  and  after  cycling 
(ON-OFF)  the  clocked  input  toggle  button, 
the  output  is  observed  for  conformance  to 
the  truth  table.  Most  clocked  flip-flops 
require  a  shaped  clock  input,  A  Schmitt 
Trigger  circuit  is  included  in  the  tester  to 
provide  the  proper  clocked  waveshape. 

Any  flip-flop  may  have  a  direct  set  and/or 
direct  clear  input  which  override  any  other 
inputs.  No  matter  what  inputs  or  clocked 
signals  are  applied,  a  direct  set  (Sd)  input 
sets  the  output  (Q)  high  and  a  direct  clear 
(Cd)  input  resets  the  output  (Q)  low.  Be  sure 
to  check  all  these  functions  before  declaring 
the  device  good. 

The  IC  tester  shown  in  Fig.  3  is  simple 
and  parts  layout  is  not  critical.  Rotary  or 
lever  switches  can  be  used  for  pin  setup 
selectors  although  6  position  lever  switches 
are  hard  to  come  by.  Follow  the  switch 
sequence  shown.  If  your  Schmitt  Trigger 
output  does  not  operate  a  flip-flop  toggle 
input  consistently,  add  a  100  pF  capacitor 
across  the  IK  resistor  in  the  Schmitt  Trigger. 

If  you  have  to  switch  an  output  pin 
through  a  voltage  position  (1.5V  or  4,5V) 
during  a  test,  turn  the  supply  switches  OFF 
until  completing  the  change. 


Any  meter  indicating  5  or  more  volts  will 
work.  I  had  a  100  //A  meter  on  hand  and 
series-mounting  a  47K  resistor  with  it  re- 
sulted in  a  5 V  movement. 

The  number  and  type  of  IC  sockets 
depend  on  how  many  types  you  want  to 
test.  My  tester  has  a  10  pin  circular  (works 
FB  for  8  pin  devices)  and  a  14  pin  in-line 
socket.  If  you  plan  to  test  any  16  pin  in-line 
devices,  I  suggest  adding  a  separate  16  pin 
socket  rather  than  trying  to  use  a  16  pin 
socket  for  both  14  and  16  pin  devices.  This 
would  throw  off  your  selector  switch  num- 
bering. 

Flat-pack  sockets  are  also  available  and  its 
addition  will  be  well  worth  while  as  flat- 
packs  are  becoming  very  plentiful  on  the 
surplus  market. 

I  use  a  penlite  battery  power  supply 
although  a  well  filtered  ac  supply  is  just  as 
good. 

Conclusion 

The  use  of  ICs  can  help  build  up  your 
shack  accessory  shelf  with  a  minimum  of 
construction  time.  By  taking  advantage  of 
the  IC  bargains  available  today  and  eliminat- 
ing frustrating  hours  of  troubleshooting  a 
project  that  won't  work  by  checking  the  ICs 
beforehand,    the    "appliance    operator"    tag 

can  be  shed  forever. 

.  .   WA6IGU 


DECEMBER  1973 


75 


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•  Headphone  jack  for  noise-free  mobile  operation 

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Dr.  J.  Blasi  KA6IX 

Ryukyu  Is, 

Box  46 

APO  San  Francisco  9633  J 


THE  OS 


BY- LAND 


Last  summer,  the  Island  of  Okinawa  was 
being  subjected  to  a  typhoon  that  was 
using  its  rains  and  wind  to  shut  everything 
down.  For  two  days  I  had  been  off  the  air 
because  the  antennas  were  lowered  to  pre- 
vent winds  of  80  knots  from  turning  them 
into  a  mass  of  tangled  wire. 

I  was  deeply  absorbed  in  a  rather  old 
medical  journal  when  the  phone  rang.  An 
old  pal  of  mine.  Bob  Martin,  was  sitting  at 
the  Naha  airport,  waiting  for  the  weather  to 
lift.  He  was  24  hours  out  of  Burma  and 
trying  to  get  back  to  the  U.S. 

A  30-minute  ride  through  pounding  rain, 
several  seconds  of  handshaking  and  back- 
slapping,  a  second  ride  of  15  minutes,  and 
we  were  seated  in  a  comfortable  military 
club.  After  ordering  drinks,  Bob  explained 
he  had  been  working  for  the  past  three 
months  in  Northern  Burma  for  a  private 
geological  firm.  The  pay  had  been  excellent 
and  armed  guards  had  been  provided  for  his 
safety. 

He  finished  half  his  drink  and  began  to 
unfold  a  story  that  still  leaves  me  with  a  cold 
feeling. 

"After  being  briefed  in  Rangoon  for 
about  three  days,  I  was  flown  to  Myitkyma 
in  Northern  Burma.  1  began  my  soil  studies 
while  the  guards  set  about  erecting  bamboo 
huts.  The  first  night  we  had  visitors,  but  a 
few  rifle  shots  from  the  guards  dispersed  our 
would-be  thieves. 

"For  the  first  two  weeks,  the  geological 
aspects  of  Burma  kept  me  quite  busy.  As  the 
routine  began  to  slow  down,  I  turned  to  ham 
radio.  In  the  trunks  and  cases  of  supplies  I 
had  included  one  of  the  latest  2  watt, 
printed  circuit  transceivers  which  would  run 
off  one  of  the  truck  batteries. 


"I  had  purchased  this  little  QRP  rig  for  a 
little  80  and  40  meter  SWLing  in  the 
evenings.  After  a  hard  day  of  work,  Vd 
bathe,  dine  on  canned  beef  and  rice  and  put 
my  ear  phones  on  for  a  few  hours.  The 
antenna  was  a  thin  wire  strung  from  tree  to 
tree  with  a  length  of  about  60  feet.  Forty 
meters  was  a  mass  of  static,  QRM  and  JA 
stations,  so  tightly  packed  they  resembled  a 
can  of  worms. 

"One  night  on  the  low  end  of  80  meters, 
I  heard  a  loud,  T6  CW  station  testing,  It 
must  have  been  within  a  few  hundred  miles, 
but  no  call  sign  was  given.  The  following 
night  the  same  signal  was  on  again,  but  the 
buzz  and  chirp  was  sending  out  Morse 
code  .  ,  ,  .  de  BY1  **.  I  cannot  use  the  call 
sign  in  its  entirety  because  of  later  events 
that  took  place. 

"On  the  third  night  he  was  there  again, 
but  there  was  a  CQ  followed  by  BY1** 
about  twenty  times. 

tsI  had  only  three  days  left  in  Myitkyina 
(which  is  about  50  miles  from  the  China 
border)  and  in  a  week  I  would  be  heading 
back  to  the  U.S.  Would  I  dare  answer  the  CQ 
of  a  fellow  ham?  I  spent  the  next  day 
constructing  a  crude  key  from  strips  of 
metal  and  wood.  A  quick  test  showed  that  I 
was  putting  about  one  watt  or  less  into  my 
antenna  on  80  CW. 

"That  night  I  waited  to  give  BY1**/XZ. 
Not  quite  legal,  but  in  this  case  the  radio 
amateur  spirit  was  beyond  law. 

"He  came  back  to  me.  He  was  only  able 
to  repeat  his  call  and  something  that  came 
over  as  Ten — ng,  A  quick  check  on  a  map 
showed  this  to  be  Teng  Chung,  his  QTH. 
which  was  about  75  miles  east  of  me.  I  gave 
him  my  first  name  and  QTH  (I  would  be  out 


DECEMBER  1973 


79 


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of  there  in  a  matter  of  hours).  The  QSO 
ended  as  his  signal  dissolved  in  a  final  chirp,  a 
few  buzzes  and  then  silence.  He  appeared  to 
be  having  rig  troubles. 

"I  was  a  happy  man  that  night  as  I  drifted 
off  to  sleep.  About  1  AM  the  guards  fired  a 
few  shots  at  the  ever  present,  but  elusive 
thieves. 

4AThe  next  night,  I  gave  him  another  call. 
He  was  there  all  right,  but  his  rig  lasted  only 
long  enough  for  him  to  repeat  .  .  . 
"QSL"  .  .  .  and  then  it  stopped. 

"On  my  last  night,  there  was  no  sign  of 
BY  1  **.  I  had  less  than  24  hours  left  before  I 
was  due  to  leave  Burma  and  most  of  this 
time  would  be  devoted  to  packing.  Shortly 
before  dawn,  I  was  awakened  by  rifle  shots, 
a  rushing  of  feet  and  the  guards  yelling  at  me 
to  come  outside.  They  had  shot  and  killed 
one  of  the  thieves,  The  poor  devil  was  dead 
beyond  doubt,  two  shots  in  the  chest  had 
finished  him.  There  was  a  small  packet  of 
papers  in  his  pocket.  I  collected  these  and 
went  into  my  hut  to  examine  them  under 
the  kerosene  lamp. 

"Sorting  through  the  crumpled  and 
bloody  papers,  I  received  the  shock  of  my 
life,  for  before  me  was  a  QSL  card  from 
BY1**.  It  was  home  made,  had  his  name, 
QTH  and  was  addressed  to  my  call  sign.  The 
body  lying  outside  was  BY!**  who  had 
crossed  the  border  to  Burma  hoping  to 
deliver  the  QSL  to  me.  I  was  physically  sick 
for  the  first  time  in  years,  I  wept. 

"We  buried  htm  near  the  camp,  his  grave 
marked  with  a  stone  engraved  with  BY1**." 

Bob  Martin's  story  was  finished.  I  was 
deeply  moved,  I  had  nothing  to  really  say.  I 
drove  him  to  the  airport  and  as  he  was 
preparing  to  board  the  plane  he  made  a  final 
gesture.  He  handed  me  the  battered  and 
stained  QSL  card  of  BY  1  **. 

"Doc,  you  take  this.  Keep  it  out  here  in 
Asia." 

I  was  about  to  argue  with  him  that  he 
should  keep  the  QSL,  but  Bob  dashed  into 
the  plane. 

I  had  the  QSL  framed  and  keep  it  in  my 
shack  here  in  KA6  land.  The  next  time 
you're  in  Okinawa,  stop  in,  Vd  be  proud  to 
show  it  to  you. 

.  .  .KA6JX 


80 


73  MAGAZINE 


John  S.  Hollar  Jr,  W3JJU 
377  Rumson  Drive 
Harrisburg  PA  17104 


S 


A  TWO-TON 


SEQUENTIAL 


ECTIVE  CALLING   DECODER 

It  beeps  your  horn  *  •  •  has  a  message  lamp 
and  sounds  like  something  out  of  Star  Trek. 


OK  ...  so  the  repeater  is  getting  jammed 
up  and  all  that  nonesense  is  getting  on 
your  nerves.  Squelch  circuits  have  been 
acclaimed  as  the  greatest  thing  since  cheap 
monitor  receivers.  With  noise  pollution  on 
the  rise,  some  peace  and  quiet  helps  to 
produce  less  fatigue  on  the  ears.  Repeater 
cliques  have  developed  to  the  point  where  a 
more  sophisticated  selective  calling  device 
might  fill  a  very  attractive  need  to  those  who 
require  constant  monitoring  but  without  all 
the  "chit-chat/'  The  device  to  follow  is 
interesting  to  use  because  it  sounds  so 
professional  and  works  very  nicely  at  a  low 
cost,  It  can  be  made  up  for  single  tone 
decoding  or  a  two-tone  unit  as  is.  Whatever 
you  need,  the  small  size  and  low  power 
requirement  will  allow  use  with  most 
modern  two  meter  transceivers  as  well  as  a 
host  of  surplus  mobile  units. 

The  Alert  Tone 

When  called  by  a  fellow  amateur,  the 
only  thing  that  happens  is  a  three  second 
LOUD  warbling  tone  which  triggers  inde- 
pendently from  the  trigger  tones  and  shuts 
down  three  seconds  after  the  final  tone.  The 
first  and  second  tones  must  be  of  a  one 
second  duration  each.  Any  shorter  and  no 
trigger  .  .  .  any  longer  and  the  tone  goes 
longer.  During  breadboarding  a  sonalert  was 
considered,  but  because  of  high  cost  and 
size,  it  was  given  up  in  favor  of  the  warbling 
alert  tone.  Using  inexpensive  import  parts 
and  a  UJT,  an  alert  tone  unit  is  the  result 
with  a  rather  unique  power  oscillator  for 
audio.  The  resulting  signal  is  both  pleasant 
and  modern  sounding. 


The  entire  resting  current  for  the  alert 
tone  is  2.5  mA  and  when  signaling  it  runs 
about  25  mA.I  was  amazed  at  how  loud  the 
tone  was  for  so  small  a  current  drain  and 
checked  it  several  times  to  be  sure,  The  33K 
resistor  and  the  25  /xF  capacitor  in  the  UJT 
gate  sets  up  a  sawtooth  pulse  which  is  (slow 
switched)  used  to  forward  bias  Q10  at  the 
same  rate.  Since  the  frequency  of  this 
oscillator  is  dependent  upon  voltage,  the 
base  of  Q 10  varies  the  voltage  feedback  path 
to  the  audio  transformer  and  a  warbling  rate 
is  established.  Any  number  of  assorted  alert 
tones  may  be  selected  by  attaching  a  10  juF 
capacitor  to  any  of  the  components  in  the 
UJT  to  ground.  Any  attempt  to  switch  this 
audio  by  an  thing  other  than  a  relay  was 
futile  and  resulted  in  a  slow  takeoff  and  a 
dying  effect  that  sounded  just  awful.  Since 
an  extra  set  of  relay  contacts  exist  on  the 
horn  relay,  it  presented  no  problem  to 
switch  on  the  alert  tone  mechanically  and 
the  end  result  is  a  sharp  "on-off"  effect 
when  receiving  a  call. 

Frequency  Selective  Reeds 

The  decoder  derives  audio  from  the  re- 
ceiver from  any  convenient  source  either 
squelched  or  unsquelched  (which  makes  the 
unit  ideal  for  the  Twoer).  After  clipping  (if 
required)  and  suitable  amplification  from 
Ql,  the  emitter  follower  drives  two  G.E. 
Tone  Reeds  in  series.  My  original  experiment 
used  this  same  set  up  for  the  Motorola 
Vibrasponder  reeds  although  these  are  not 
really  reeds. 

The  difference  is  that  the  G.E.  reeds  give 
a  mechanical  vibrating  contact  closure  when 


DECEMBER  1973 


81 


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With  rack  w /cabinet  - . . $1 15.00 

TTL  logic.  Power  line  frequency  counter  for  3 
minute  or  less  timing  and  control.  Easily  re- 
programmable diode  ROM  uses  only  27  diodes 
(depending  on  call)  to  send  DE  "any  call".  Low 
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All  circuitry  including  PS  on  small  G10  glass  PC 
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O -x 

r O 

D 

a 
o 

o * 

^ 0 

. 1 

BO — 

200JI 
CO 


1 A 


i    I -0 


&.  a 


o    o 


C    0 


MOTOROLA  TLN   VIBR0SP0NDER 


GE  TONE  REED 


Fig.  L  Motorola  and  GE  tone  reeds. 

the  primary  driving  coil  receives  audio 
energy  at  the  exciting  frequency.  In  order  to 
derive  a  usable  audio  waveform  or  pulse  for 
decoding  purposes,  the  G.E.  Reed  requires 
some  switching  voltage.  It  works  very  rriuch 
like  a  synchronous  vibrator,  in  that  supply- 
ing dc  across  the  normally  open  reed  con- 
tacts, when  vibrating,  produces  a  very  ragged 
waveform   equal   to  the  exciting  frequency. 

The  Motorola  TLN  series  of  "reeds"  (see 
Fig.  1 )  actually  does  the  same  thing  but  acts 
more  like  a  frequency  selective  voltage 
generator.  When  excitation  audio  reaches  the 
design  frequency,  a  vibrating  element  which 
must  be  magnetized  induces  a  very  small 
voltage  in  a  secondary  coil  which  then  can 
be  amplified  and  rectified  by  later  stages. 
Here  the  waveform  is  a  pure  sine  wave.  In 
any  event,  either  reed  can  be  used  in  the 
circuit  and  the  pc  board  was  designed  to  use 
the  G.E.  reeds  because  they  are  smaller,  less 
expensive,  and  produce  a  gain  over  the  TLN 
type.  If  the  Motorola  reed  is  to  be  used, 
eliminate  the  voltage  drive  and  the  RC  filter 
and  think  of  it  as  a  transformer,  grounding 
one  side  of  the  secondary  and  driving  the  .2 
fiF  with  the  other  side  of  the  secondary,  For 
two-tone  operation  the  primaries  may  also 
be  in  parallel  with  the  emitter  of  Q  L 

As  an  after  thought,  the  frequency  selec- 
tive relay  used  in  remote  control  airplane 
work,  wiJJ  work  very  nicely  and  can  be 
driven  directly  from  the  receiver  speaker 
eliminating  the  need  for  Ql.  These  five-tone 
relays  are  available  from  Lafayette  Elec- 
tronics and  require  the  G.E.  voltage  derived 
circuit.  Since  these  relays  tend  to  be  lower  in 
frequency,  by  carefully  removing  the  tine 
mounting,  the  tine  lengths  can  be  filed  to  a 
higher  frequency  but  don't  go  much  beyond 
800  Hz,  because  the  contactor  is  mounted 
too  far  forward  for  a  good  "make/* 

The  Basic  Decoder 

Once  the  frequency  selective  element  has 


82 


73  MAGAZINE 


9GJ* 


+  I2V  IN     25mA  RESTING 
(IF  AUTO„.  PUT  CAP  8 
FILTER  IN  LINE) 


SPKRO-^f 

TONE 

IN 


TO  SPKR 

TO  SPKR  Ml 

OLTTPUT 

AUDIO 


TO  HORN 
RELAY 


TO  XMIT 
>v     REG 


TO  MIC  HI 

TOTX  AUDIO 
HI 


ISV 

IOV     -±- 

-      3  SEC  DELAY 


Fig,  2.  Schematic  of  the  decoder. 


been  selected,  the  corresponding  output  is 
amplified  by  Q2  (for  tone  A,  the  first  tone 
in  sequence)  and  rectified.  Notice  that  a  10 
juF  and  82K  time  constant  has  been  added  to 
the  first  tone  dc  output,  This  RC  network 
prevents  trigger  on  anything  but  the  proper 
tone  sequence,  allows  Q3  to  conduct  long 
enough  for  the  second  tone  to  arrive  through 
Q5  and  Q6  ...  and  prevents  reverse  tone 
signaling;  he.,  where  the  tone  sequence  is 
reversed  and  the  same  two  tones  are  used. 
This  feature  allows  a  simple  two  tone  en- 
coder to  signal  two  decoders  by  alternating 
tone  sequence,  and  permits  a  simultaneous 
"all-call*  when  the  tones  are  sent  together  in 
a  two  second  burst.  Q3  and  Q6  form  a  basic 
AND  gate  which  only  conducts  when  both 
tone  signals  have  been  received.  Since  this 
point  is  very  brief,  the  result  is  a  sudden  dip 
in  the  outputs  of  Q4  and  Q7  which  cut  off 
momentarily.    When    Q4   cuts   off,    emitter 

voltage  increases  sufficiently  to  fire  the  SCR 
and  the  lamp  circuit. 

Lamp    current    which    must    be    in    the 


"holding"  range  of  the  SCR  will  then  hold 
the  SCR  "on"  giving  a  call  lamp.  Other 
functions  can  be  designed  into  this  hold 
function  such  as  starting  a  timer  for  a  tape 
recorder. 

The  other  control  function  also  derives  its 
voltage  drop  from  Q3  through  the  other  10K 
resistor  which  provides  isolation  between  the 
two  trigger  stages.  Q7  uses  a  similar  emitter 
follower  which  provides  a  healthy  voltage 
spike  from  its  cut  off.  Here  the  voltage 
passes  through  the  diode,  is  used  to  charge 
the  100  juF  capacitor  and  bleeds  slowly 
through  the  6,8K  resistor  holding  Q8  into 
conduction  for  about  three  seconds.  This 
type  of  delay  circuit  is  attractive  because  it 
is  inexpensive  and  is  fairly  reliable.  The 
diode  is  required  to  keep  the  capacitor  from 
discharging  back  through  the  emitter  of  Q7. 
The  net  result  is  a  delay-relay  which  is 
activated  by  a  one  half  second  burst.  If  more 
time  is  required,  increase  the  capacitance  or, 
being  careful  to  keep  Q8  conducting,  in- 
crease   the  bleeder  resistor.  Stretching  this 


DECEMBER  1973 


83 


Fig.  3.  PC  board,  actual  size  (foil  side). 


delay  circuit  to  maximum  with  a  12V  supply 
and  a  half  second  pulse,  I  was  able  to  get 


«*  ' 


■n^ 


WSJJU's  original  bread-boarding  of  the  circuit. 


about   twelve  seconds  with  the  relay  speci- 
fied and  a  transistor  of  average  beta, 
Bread  boarding  The  Final  Design 

The  project  was  initially  breadboarded.  It 
was  designed  from  basic  transistor  know- 
ledge as  I  went  along.  I  was  surprised  at  how 
much  fun  it  was  to  grab  a  piece  of  wood  — 
pound  a  lew  wire  brads  in,  and  solder  the 
parts  together.  Usually  when  trying  out  a 
circuit,  1  do  everything  without  the  board, 
ending  up  with  a  pile  of  soldered  com- 
ponents which  might  have  more  practical 
value  in  an  art  show.  Avoiding  the  electronic 
sculpture  technique  permitted  the  use  of  far 
more  junk  parts  which  were  easily  clipped  in 
and  out  during  experimenting.  Breadboard- 
ing  this  way  really  saves  time  and  is  worth 
the  effort. 

The  next  step  was  to  copy  down  the 
circuit,  design  the  pc  board  and  mount  the 
parts.  Throughout  the  design,  only  surplus 
capacitors  and  transistors  were  used.  The 
transformer  is  a  standard  50017  to  3.5H  and 
is  made  by  Midland, 

The  board  size  will  fit  snugly  inside  most 
small  receivers  or  control  heads  or  can  be 
side  mounted  in  a  box  containing  the  horn 
switch,  hook  switch  for  the  microphone  and 
call  lamp  and  reset  button. 


84 


73  MAGAZINE 


AUOIO^ 


SPKR  Hi 


MIC 

AUDIO  TRANSMIT  IN 

HORN 

KEY 

CHASSIS  GROUND 

♦  12  VOLTS  BATTERY 


WORM  CLOSFn 

$H  RESET  CALL  LAMP 


r*t  I     ■    aud  (  L0W  CUfl   l£NT 


290mA    0»  LESS  .12  VOLTS 


) 


Fig.  4.  Parts  placement  on  the  PC  board 


Applications  For  The  Decoder 

Once  constructed  no  adjustments  need  to 
be  made  —  it  either  works  or  it  doesn't, 
(heck  each  stage  of  audio  and  measure  dc.  A 
good  scope  will  point  out  the  problem  If 
any.  All  testing  was  with  an  old  car  battery 
and  the  heavy  current  stages,  the  lamp  and 
relay,  are  isolated  from  the  decoder  through 
simple  zener  regulation.  This  helps  to  pre- 
vent falsing  when  starting  the  car  or  if  car 
generators  are  hotter  than  the  average.  The 
Potter-Brum  field  relay  is  expensive  (about 
$5,00)  but  is  very  small  for  a  3PDT  relay 
and  provides  many  uses: 

1.  Connect  one  contact  through  a  single  pole 
switch  to  the  hom  relay  in  the  auto. 
Connect  the  other  contact  to  ground. 
When  the  decoder  signals,  the  horn  will 
blow  for  three  seconds,  and  may  be 
disabled  with  the  switch. 

2 .  Likewise,  the  SCR  can  switch  on  the 
dome-light  for  nighttime  silent  alerting 
and  may  be  cut  with  a  switch. 

3.  Shunt  the  audio  output  from  the  receiver 
to  speaker  through  an  8fi  resistor  and 
drive  the  speaker  with  the  decoder  alert 
tone.  Use  a  microphone  "hook  switch"  so 
that  when  the  microphone  is  "on-hook** 


the  speaker  is  muted.  You  now  have  the 
same  type  of  system  as  a  home  telephone. 
4.  I  haven't  checked  the  legality  (and  I  don't 
intend  to  use  this)  but  some  mobile 
services  other  than  amateur  use  a  call 
verification  signal.  This  can  be  provided 
by  keying  the  transmitter  from  the  de- 
coder relay,  and  switching  the  warbling 
tone  to  microphone  input  When  signaled, 
the  mobile  unit  switches  on  and  transmits 
the  last  two  seconds  of  the  warbler  so  that 
the  calling  party  knows  that  received 
party  has  his  unit  on  and  his  call  was 
received.  If  nothing  comes  back,  don't 
bother  wasting  airtime  calling.  His  unit  is 
probably  off. 

It  was  mentioned  earlier  that  the  unit 
could  be  used  with  a  single  tone.  By  using 
one  reed  and  grounding  the  emitter  of  Q3, 
the  decoder  will  respond  to  a  one  second 
single  tone  burst,  Building  and  using  a 
decoder  can  provide  an  interesting  and  pro- 
fessional touch  to  an  average  "open  mike" 
repeater  system.  It  reduces  the  strain  of 
increased  VHF  activity,  which  should  reduce 
the  complaints.  After  all  if  you  don't  hear 
4em,  you  don't  have  to  work  'em! 

.  .  .W3JJU 


DECEMBER  1973 


85 


Meet  the 
meter  SSTV 


From  left:  Bill  Arrowsmith,  W6TEZ;  Judge  William  Ritzi,  W60WL;  Judge  Pearce  Young,  WB6HWY; 

Byron  Paul,  WA6RNG  (Producer-Director  of  the  Dick  Van  Dyke  Show) 

that's  right ...  2  meter  SSTV 


Shown  above  are  four  hams  who  have  had  so 
much  fun  working  SSTV  on  2  meters  and  220  that 
we  asked  them  if  they'd  make  a  few  comments 
about  it  for  one  of  our  ads. 

We  went  up  to  Los  Angefes  (where  they  all  oper- 
ate) and  chatted  with  them  a  bit.  They  all  agreed 
that  one  of  the  biggest  enjoyments  of  working 
2  meter  SSTV  is  the  new  dimension  it  adds  to  2 
meters,  far  more  interesting  and  creative  than 
operating  radio  alone. 

They  noticed  a  steadily  increasing  SSTV  activity 
on  2  meters,  observing  that  there  must  be  50  or 
more  operators  working  SSTV  on  2  meters  or  220 
in  LA  alone. 

One  observed  that  working  DX  doesn't  offer  the 
challenge  it  used  tot  since  you  can  buy  all  the 
power  you  want,  ,  . .  "So  where's  the  challenge. 
SSTV  is  the  new  challenger' 

They  work  a  schedule  once  a  week  or  so,  and 
have  little  problem  in  raising  SSTV  contacts.  "In 
fact,  everytime  we  get  on  the  air,"  Judge  Ritzi 
noted,  uwe  have  break-ins  from  a  lot  of  hams 
wanting  to  know  more  about  SSTV/* 

And  a  bit  of  information  that  hadn't  occurred  to 


us;  their  families  realty  get  interested  in  SSTV. 
They  all  enjoy  it,  and  often  work  together  pre- 
paring the  art  work  and  pictures  for  the  produc- 
tion of  their  TV  shows. 

We  were  very  grateful  for  their  comments,  and, 
for  the  time  they  gave  to  us.  Thank  you  gentlemen. 

We  can't  guarantee  that  you'll  appear  in  one  of 
our  ads  when  you  begin  working  SSTV  on  2 
meters,  but  we're  pretty  sure  we  can  guarantee 
you  as  much  enjoyment  as  our  "2  meter  SSTV 
Gang"  from  Los  Angefes. 

For  details,  and  complete  literature  on  Robot's 
SSTV  equipment  just  write  to  us. 

See  you  at  SAROC. 

MODEL  70A  MONITOR $295 

MODEL  80A  CAMERA $295 

MODEL  61  VIEWFINDER ... $239 

All  Robot  equipment  car- 
ries a  one -year  warranty. 
Four  easy  ways  to  pur- 
chase: cash,  C,O.D.t  Mas- 
ter Charge.  BankAmericard 


I  ROBOT l 


ROBOT  RESEARCH  INC.     7591  Convoy  Court, 
San  Diego,  CA  92111     Phone  714  279-9430 


JC  R.  Klopf  KL7EVO 
265  Steele  Cr.  Road 
Fairbanks  AK  99701 

UNREG 
INPUT 

h 



PASS 

1 

*            o        nEQ 

ELEMENT 

OUTPUT 

REFERENCE 

COMPARE 

CONTROL 

BASIC 
VOLTAG 
REGULATOR 


Remember  transistors? 
They  do  a  fine  job  when 
I  Cs  aren't  hanaw 


One  of  my  recent  electronic  efforts  was 
full  of  TTL  devices  and  needed  a 
regulated  five  volt  supply.  A  search  through 
the  junk  box  showed  that  I  was  out  of 
my  usual  collection  of  IC  regulators,  I  don't 
know  about  your  junk  box,  but  if  it  is 
anything  like  mine  it  concentrates  on  the 
fundamentals  -  the  essentials:  transistors. 
resistors,  capacitors  and  little  else.  Every  so 
often  I  have  a  fairly  good  stock  of  ICs  but 
unknowingly,  some  innocent  project  always 
depletes  my  supply.  This,  I  realize,  is 
evidence  of  inefficiency,  C'est  la  vie. 
Another  check  indicated  that  my  zener 
diode  supply  was  in  no  better  shape. 

Naturally,  I  had  drawn  schematics  and 
sketched  pc  board  layouts  before  i  found 
that  1  had  no  parts  to  fit,  but  all  that  work 
at  least  makes  you  think  a  little  about  how  a 
circuit  works.  And  a  voltage  regulator  minus 
frills  really  only  consists  of  a  few  elements. 
A    pass    element,    usually    a    transistor;    a 


Fig.  I.  Elements  of  a  series  voltage  regulator. 

reference  element,  generally  a  zener  diode; 
and  a  comparison  and  control  amplifier 
which  compares  the  output  voltage  with  the 
reference  voltage  and  whose  output  then 
causes  the  pass  transistor's  resistance  to  vary 
in  such  a  way  as  to  keep  the  output  voltage 
constant.  See  Fig,  1.  The  frills,  although 
sometimes  necessary,  (current  limiting, 
temperature  stability,  rapid  response,  etc.) 
were  not  really  needed  for  my  application. 

There  was  no  parts  problem  with  the 
control  amplifier  and  pass  element  since  I 
was  liberally  stocked  with  transistors  but  the 
reference  element  was  the  stumbling  block. 
In  Fig.  2  the  current  /voltage  diagram  illus- 
trates the  operation  of  a  diode  in  both  the 
forward  and  reverse  conduction  regions,  A 
zener  diode  depends  on  the  reverse  conduc- 
tion region  for  its  operation;  when  the 
reverse  voltage  across  the  diode  exceeds  a 
certain  value  the  diode  breaks  down  and  the 
voltage  remains  constant  for  wide  ranges  of 
current.  In  order  not  to  destroy  the  diode 
the  current  must  be  limited  to  a  safe  value 
by  a  series  resistor.  For  example,  if  you  had 
a  one  watt  zener  diode  and  the  breakdown 
voltage  was  ten  volts  then  the  current  must 
be  limited  to  1/10  ampere  or  100  mA  to 
stay  within  the  power  rating  of  the  diode. 


REVERSE 
CONDUCTION 


/ 


FORWARD 

CONDUCTION 


1 


k. 


3  V  GERMANIUM 
7  V  SILICON 


Fig.  2.  Junction  diode  current /volt  age  diagram. 


DECEMBER  1973 


87 


PORTA- PAK 

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ICOM  -  200  -  230 

OTHERS    MADE  TO  ORDER 

Room  for  charger  &  tone  encoder  in  case 


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P  O    BOX  67 
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+  o 


UNREG 


■O    + 

REG 


—    Q— 
UNREG 


(50  ^ 


12  V 


+  o- 


Z-\Q  v 


o  + 


Fig.  3,  Forward  biased  diodes  replace  zener  diode 
as  reference. 

Also  for  a  wide  range  of  currents  a  diode 
shows  a  relatively  constant  voltage  drop  in 
the  forward  conduction  region.  This  voltage 
drop  is  about  ,3  volts  for  germanium  and  J 
volts  for  silicon  diodes.  Slight  variations  in 
this  voltage  are  due  to  the  current  through 
the  diode,  the  temperature,  and  the  doping 
of  the  junction  material  but  it  can  be  a  good 
stable  voltage  which  may  be  used  for  a 
voltage  reference.  So  if  you  want,  you  can 
replace  a  zener  diode  with  a  string  of 
forward  biased  diodes  to  get  the  reference 
voltage  you  need,  as  in  Fig.  3. 

It  is  possible  to  go  one  more  step  in  this 


Fig,  4.  Base-emitter  voltage  as  reference, 

direction  and  wind  up  with  the  voltage 
regulator  I  used,  which  is  illustrated  in  Fig. 
4.  This  circuit  utilizes  the  forward  biased 
base-emitter  junction  (a  diode)  of  the  con- 
trol amplifier  as  the  reference  element  and 
reduces  the  component  count  to  a  satisfying 
minimum.  I  used  PNP  transistors  to  get  a 
negative  regulated  voltage,  but  NPN  transis- 
tors could  be  used  to  obtain  a  regulated 
positive  voltage  output.  If  additional  regula- 
tion is  desired  another  stage  could  be  added 
to  the  control  amplifier.  A  common  way  of 
accomplishing  this  would  be  to  darling  ton 
connect  a  transistor  to  the  pass  element. 
However,  in  such  a  situation,  I  would  recom- 
mend going  the  IC  regulator  route. 

.  .  .KL7EVO 


So 


73  MAGAZINE 


TAKE -APART 


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BEAM 


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ELEMENTS 


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Fig.  2.  The  2  meter  beam.  All  elements  are  measured  from  center  of  boom. 


Here  is  a  portable,  take-apart  two 
meter,  three  element  beam  for  FM 
that  can  be  disassembled  and  stuffed  into  a 
long  umbrella  case  for  ease  in  carrying 
around.  It  stirred  up  the  Boston  area  boys 
and  they  wanted  more  information  on  it.  It 
features  simple  construction  using  junk  box 
parts  and  is  FB  for  walkies  and  portable 
operation.  Supporting  the  beam  may  be 
done  by  various  methods.  Some  have  used 
rope  to  hang  it  from  the  ceiling,  attached  it 
to  swinging  doors,  pasted  it  on  the  wall,  or, 
in  the  case  of  Tony  K 1 VTE,  on  his  shoulder 
while  walking  around  with  his  Tempo,  ignor- 
ing the  wild-eyed  onlookers. 

The  main  boom  and  the  take-apart  exten- 
sion was  scrounged  from  l/i  in.  (std)  alumi- 
num tubing  -  which  in  our  case  were  the  leg 
supports   from   a    discarded   portable  metal 


snack  table.  If  you  have  any  of  these  around 
the  house,  maybe  the  XYL  will  donate  one 
for  the  cause.  The  six  elements  are  from  1/8 
in,  (std)  brass  rod  with  the  ends  threaded 
6/32  to  fit  into  the  banana  plugs.  They 
could  also  be  soldered  in.  Miilen  —3  7222 
binding  posts  are  used  for  the  jacks,  and 
fitted  in  the  holes  in  the  boom  and  secured 


JACKS    ARE 
M1LLEN    #37222 
BINDING   POSTS 


NUT 


BOTH  ENDS 


Fig,  2.  Details  of  end  elements. 


DECEMBER  1973 


89 


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Fig.  3.  Driven  element  details, 

with  8/32  nuts.  The  slight  offset  of  these 
jacks  at  each  far  end  of  the  boom  does  not 
materially  affect  the  performance.  The 
ceramic  center  insulator  is  a  surplus  unit 
with  8/32  threaded  holes  to  accommodate 
the  binding  posts.  The  threaded  ends  of  the 
posts  are  shortened  a  bit  so  they  will  screw 
down  tight  to  the  center  insulator,  securing 
solder  lugs  or  clips  for  the  coax  feed. 

It    works    like    a    charm    and   the   com- 
pactness is  a  bonus  for  people  who  travel. 

..   W1BHD 

73  MAGAZINE 


John  A  Carroll  K6HKB/1 
31  IB  Washington  Street 
Norwood  MA  02062 


MAK 


THE  MOST 


OF 


AUTOMATIC  IDENTIFICATION 


Wayne's  editorial  in  the  September 
1972  issue  lit  my  fire  when  he  got 
to  automatic  identification.  I've  been  talking 
up  an  automatic  calling  and  alerting  system 
for  a  long  time,  and  it  looks  to  me  as  though 
one  black  box  could  do  the  ID  job  as  well. 
The  requirements  are  very  similar.  1  pulled 
an  old  paper  out  of  the  files,  and  it  stilJ 
looks  relevant. 

Briefly,  the  idea  is  to  set  up  a  single 
calling  frequency  in  each  band.  Anybody 
wanting  to  contact  a  specific  station  would 
send  a  digital  word  giving  the  calls  of  the 
station  called  and  the  station  calling,  in  a 
coded  form.  An  autocall-equipped  station 
would  have  a  black  box  connected  to  the 
receiver,  constantly  monitoring  the  calling 
frequency.  It  would  ring  a  bell  when  it 
recognized  its  call. 

Most  of  the  logic  required  to  transmit  a 
digital  call  is  the  same  as  that  needed  to 
receive  it,  so  it  makes  sense  for  one  unit  to 
do  both.  Now  we  throw  in  the  self-identifi- 
cation  (SID?)  function,  and  the  unit  pro- 
ceeds to  take  over  the  transmitter  whenever 
the  rule  says  it  should.  It  sends  only  the  half 
of  the  autocall  transmission  that  contains 
identification.  Naturally,  this  happens  on  the 
working  frequency. 

Since  identification  comes  right  after  the 
start  pulse  in  the  SID  transmission,  il  makes 
sense  to  invert  the  traditional  ham  calling 
procedure  and  begin  the  autocall  transmis- 
sion with  the  identification.  Makes  the  logic 
simpler. 

A  standard,  machine-readable  form  of 
calling  and  identification  opens  up  all  sorts 
of  possibilities.  Besides  the  DXpedition 
speed-up,  there  are  DX  auto  patch,  distress 
call  monitoring,  computer-controlled  real- 
time Teletype  traffic  nets,  automatic  repeat- 


er chaining,  and  whatever  else  a  quarter  of  a 
million  fertile  and  fiendish  minds  can  invent. 
I  would  like  to  make  a  partisan  statement  at 
this  point,  to  the  effect  that  I  have  only 
emotional  sympathy  for  those  who  would 
like  to  freeze  ham  radio  into  the  techniques 
and  atmosphere  that  built  it  through  the 
twenties  and  thirties.  It's  always  been  fun, 
but  a  little  judicious  use  of  automation 
could  turn  it  into  a  really  useful  and 
dependable  emergency  commu  nication 
system  for  the  public,  which  has  always  been 
an  unfulfilled  dream.  What  we  have  now  is 
analogous  to  a  telephone  with  no  bell. 

The  rest  of  this  article  is  the  meat  of  the 
original  paper  on  the  autocall  code,  slightly 
modified  to  take  SID  into  account. 

The  idea  is  to  encode  a  ham  call  in  a  way 
that  is  easy  to  learn,  while  keeping  the 
hardware  simple.  This  way,  we  eliminate  the 
need  for  a  catalog  to  relate  a  call  to  a  binary 
number, 

Morse  code  can  be  rejected  out  of  hand. 
Those  variable  character  lengths  would  make 
the  hardware  pretty  complicated.  We  want  a 
fixed-format  binary  code,  then.  Most  of  the 
character  positions  are  letters,  so  5  bits  per 
character  should  be  enough.  This  immedi- 
ately suggests  Teletype  code,  but  this  has 
problems.  The  LTRS  and  FIGS  characters 
required  would  add  to  the  length  of  the  call 
without  carrying  any  information.  The  code 
itself  has  no  rhyme  or  reason,  and  this  would 
create  difficulties  in  the  use  of  a  very  simple 
autocall  box  in  which  the  operator  must 
manually  encode  the  call  of  the  station  to  be 
alerted. 

In  the  code  proposed  here,  we  make  use 
of  the  information  about  the  format  of  a  call 
that    is    implied   by    the    fact   that    we    are 


DECEMBER  1973 


91 


M 


dealing  with  a  ham  call.  We  know  that  every 
call  consists  of  a  prefix  and  a  suffix,  that  the 
suffix  consists  of  one  to  three  letters,  and 
that  the  prefix  consists  of  a  digit  preceded 
by  one  or  two  letters  or  a  digit  and  a  letter. 
Every  character  except  the  first  is  known  in 
advance  to  be  a  letter  or  number  by  its 
position  in  the  call,  and  hence  this  need  not 
be  sent.  All  we  need  is  an  extra  bit  to  resolve 
the  question  about  the  first  character.  We 
take  care  of  the  fact  that  some  calls  have  less 
than  the  maximum  number  of  characters  by 
defining  a  code  for  space. 

In  Fig,  1,  we  begin  by  assigning  5  bits  to 
each  of  the  6  characters  that  make  up  a  call. 
The  first  character  of  the  call  always  gets  the 
first  character  of  the  prefix.  The  last  digit  of 
the  prefix,  which  is  always  a  numeric  digit, 
goes  to  the  third  character.  If  there's  a  letter 
between  the  first  character  and  the  digit,  it 
goes  into  the  second  character  of  the  call; 
otherwise  a  space  goes  there.  The  suffix 
begins  with  the  fourth  character,  and  con- 
tinues until  all  letters  are  encoded.  The 
remaining  characters  are  filled  with  spaces. 
The  King  of  Jordan  uses  three  spaces, 
obviously.  The  third  character  can  only  take 
on  ten  values,  so  it  can  make  do  with  4  bits, 
On  the  other  hand,  the  first  character  can  be 
either  a  letter  or  a  number,  so  it  can  have  36 
values  and  hence  needs  6  bits.  So  we  borrow 
one.  The  high-order  bit  of  the  third  charac- 
ter becomes  the  FCN,  or  "first-character- 
numeric,"  bit.  When  it  is  a  h  it  indicates  a 
call  that  begins  with  a  number. 


BIT  NO-*  0    \    234567890  II   EBW 
I     I     I     I     I     1111    I     I     I    I 


1 


PREFIX 


IDLE 


CHARACTER 

I 

LTR/NUM 


CHARACTER 
2 
LWSPCE 


ICHARACTERJ 
NUM 


i5  is  rr  p  e  20  a  22 p  24 p 26 zrm  p  30  at 


1 


1 


. 


- 


SUFFIX 


CHARACTER 

4 

LTR/SPCE 


CHARACTER 
5 
LTR/SPCE 


CHARACTER 
6 
LTR/SPCE 


A  iP 

C    A 

K  R 

[T 

Y 


STATION 
CALLING 


32  333436  36  37  3S  39  4041  42434445  46 


m 


i 


CHARACTER 

I 
LTR/NUM 


CHARACTER 
2 
LTR/SPCE 


FICHARACT 
3 

N'        NUM 


STEH 

M 


474fl49505<  52S35A55  565 

H     1     I     M    T 


□ 


99996063  62  63 

I  I  I  I 


CHARACTER 
4 
LTR/SPCE 


CHARACTER 
5 

LTR/SPCE 


CHARACTER 
6 
LTR/SPCE/ 
GREEK 


IDLE 


STATION 
CALLED 

(OMITTED  FROM 
SID  BURST) 


Fig,  I.  Proposed  autocall  and  SID  word  format. 

We  have  assigned  30  bits.  Logic  hardware 
likes   to   work    with   numbers   that   fall  on 


powers  of  2,  The  next  one  would  be  25  or 
32,  It's  easy  to  find  worthwhile  things  to  do 
with  2  more  bits.  We  use  the  last  one  for  a 
parity  bit;  to  help  a  receiver  identify  and 
reject  a  call  that  had  one  bit  altered  by 
noise.  This  leaves  one.  Two,  really,  because 
there  are  two  calls  in  the  whole  transmission. 
I  would  assign  the  one  in  the  identification 
call  to  indicate  acknowledgement  of  a  pre- 
vious autocall  or  autostart  transmission*  The 
one  in  the  other  call  would  tell  whether  the 
purpose  of  the  transmission  is  to  signal  the 
operator  or  start  equipment  to  record  an 
incoming  message,  Kbits  would  indicate  ack 
and  autostart,  respectively.  Parity  should  be 
odd;  that  is,  a  32-bit  group  should  contain 
an  odd  number  of  I -bits. 

Now  let's  turn  to  Table  I,  which  defines 
the  binary  code.  Basically,  the  letters  are 
numbered  from  1  to  26  and  written  in 
binary  form,  Number  0  is  a  space.  For 
numbers,  the  values  0  through  9  are  simply 
written  in  binary  form.  Four  additional  bit 
configurations  are  defined  for  the  sixth 
character  of  the  station  called;  these  are  used 
for  things  other  than  a  call  to  a  specific 
station.  They  are  recognized  by  l's  in  the 
three  left-most  bits.  The  first  two  are  for 
group  of  symbolic  calls,  such  as  alerting  nets 
or  obtaining  some  service  that  might  be 
provided  by  any  of  a  number  of  stations  at 
different  times.  The  other  two  special  codes 
are  for  radio  control* 


I  would  suggest  that  alpha  calls  be 
assigned  to  nets  and  other  groups  of  stations 
on  request,  through  a  trustee  or  other 
officer.  These  should  go  in  the  calibook  or 
net  directory.  Beta  calls  would  be  symbolic 
calls,  designating  a  function  and  location.  It 
should  be  possible  to  assign  many  of  them  in 
a  systematic  way,  such  as  by  state,  county, 
or  metropolitan  area,  and  by  service  pro- 
vided. Examples:  WA6AC-alpha  might  con- 
vene an  emergency  net  in  Alameda  County, 
and  WP2NY-beta  might  be  a  request  for  a 
phone  patch  into  New  York  City.  Some 
group  calls  would  transcend  national  boun- 
daries; I  would  suggest  using  zero  in  the  first 
and  third  characters  for  these.  A  good 
example    of    this    would    be    a    worldwide 

distress    call,    which    might    be    coded    as 
OQORR-beta. 


92 


73  MAGAZINE 


Table  I 
BINARY  CHARACTER  CODES 


Character  Char.  1 

Char.  2, 

Char.  3 

Char.  6  of 

F 

A,  5,6 

station  called 

C 

N 

Space 

00000 

A 

000001 

00001 

B 

000010 

00010 

C 

000011 

00011 

D 

000100 

00100 

E 

000101 

00101 

F 

000110 

00110 

G 

000111 

00111 

H 

001 000 

01000 

I 

001001 

01001 

J 

001010 

01010 

K 

001011 

01011 

L 

001100 

01100 

M 

001101 

01101 

N 

001110 

01110 

0 

001111 

01111 

P 

010000 

10000 

Q 

010001 

10001 

R 

010010 

10010 

S 

010011 

10011 

T 

010100 

10100 

U 

010101 

10101 

V 

010110 

10110 

w 

010111 

10111 

X 

011000 

11000 

Y 

011001 

11001 

z 

011010 

11010 

0 

100000 

0000 

1 

1 00001 

0001 

• 

2 

100001 

0010 

3 

100011 

0011 

4 

100100 

0100 

5 

100101 

0101 

6 

100110 

0110 

7 

100111 

0111 

8 

101000 

1000 

9 

101001 

1001 

alpha 

11100 

beta 

11101 

gamma 

11110 

delta 

11111 

The  gamma  codes  would  be  used  to 
trigger  remote-control  functions,  where 
uniqueness  of  codes  is  important.  Pre- 
sumably the  Commission  wouldn't  want  to 
be  stuck  with  issuing  them,  but  perhaps  the 


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League  or  some  volunteer  committee  could 
do  that.  The  delta  codes  would  be  for 
anybody's  use,  and  depend  on  probability  to 
keep  from  activating  somebody  else's  black 
box.  Any  combination  of  bits  with  a  delta  in 
the  last  character  is  okay,  as  long  as  the 
parity  is  odd. 

This  code  is  a  close  relative  of  ASCII, 
which  would  be  handy  in  the  design  of 
co  mputer-con  trolled  message-handling 
equipment. 

An  NRZ  keying  scheme  similar  to  Tele- 
type should  work  out  well,  provided  all  units 
have  the  same  clock  rate  within  half  a 
percent  or  so,  which  is  easy  enough.  The 
transmission  would  begin  with  a  system 
idling  at  logic  0  long  enough  to  establish 
AVC  levels  and  otherwise  initialize  the  re- 
ceiver. Then  it  would  go  to  logic- 1  for  one 
clock  period  to  start  the  decoder.  The 
following  64  clock  periods  would  each  be 
assigned  to  a  bit,  and  contain  either  logic 
level  After  that,  the  system  would  go  back 
to  idling  condition  for  at  least  2  clock 
periods,  if  several  stations  are  being  alerted 
together,  or  drop  out  of  autocall  mode  and 
perhaps  go  to  receive.  In  an  SID  burst  the 
transmitter  would  go  back  to  normal  opera- 
tion after  32  data  bits. 

I'm  not  sure  how  the  FCC  plans  to 
module  the  SID  pulses  to  achieve  compata- 
bility  with  all  transmitters.  FSK  won't  work 
with  most  CW  and  AM  rigs,  and  few  FM  rigs 
have  any  CW  capability,  Subcarrier  methods 
won't  work  with  CW-oniy  rigs.  I  suppose  CW 
would  be  the  easiest  adaptation,  since  grid- 
block  keying  is  a  relatively  easy  modifica- 
tion. A  5-mS  SID  burst  would  still  present 
problems  with  a  CW  or  FSK  station,  because 
the  fast  keying  rate  would  require  much 
more  bandwidth  than  the  normal  signal. 
Slowing  ii  down  would  mo  si  likely  cause 
annoying  interference  to  the  main  signal.  A 
warning  light  half  a  second  before  the  SID 
takeover  might  help,  plus  an  interlock  Line  to 
the  Teletype  tape  reader. 

Frequencies  need  a  little  thought.  Any 
service  that  operates  on  a  recognized  fre- 
quency should  have  its  autocall  receivers  on 
that  frequency,  not  on  the  calling  channel.  A 
net  that  uses  the  autostart  feature  as  a 
selective  squelch  should  do  it  on  the  NCS 
frequency,  at  least  while  the  net  is  in  session. 


Q4 


73  MAGAZINE 


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Operation  on  the  calling  frequency  should 
be  minimized.  In  fact,  it  might  be  a  good 
idea  to  set  aside  a  second  frequency  for 
establishing  contact  and  agreeing  on  a  work- 
ing frequency,  If  the  service  gets  popular,  it 
might  even  be  necessary  to  set  up  several 
contact  frequencies,  and  make  the  choice 
between  them  according  to  the  third  charac- 
ter of  the  station  called-  (The  station  called 
is  the  only  piece  of  information  that- will 
always  be  known  to  both  stations,  even  in 
the  case  of  a  primitive  autocall  decoder/) 
The  use  of  the  autocall  frequency  for  auto- 
start and  actual  transmission  of  messages 
should  be  reserved  for  emergencies. 

We  need  one  accurate  oscillator,  to  set 
the  keying  rate.  It  would  be  nice  to  have 
that  oscillator  control  everything,  so  one 
adjustment  does  it  all.  This  means  that  every 
frequency  in  the  system  should  be  a  multiple 
or  submultiple  of  the  master  oscilaltor. 
Similarly,  the  oscillator  should  be  a  multiple 
or  submultiple  of  WWV.  2,5  MHz  is  a 
submultiple  of  all  HF  broadcasts,  but  not 
every  ham  band  contains  a  multiple  of  this 
frequency.  100  kHz  would  be  better.  This  is 


still  not  a  submultiple  of  the  60  kHz 
broadcast,  but  a  digital  divider  could 
generate  10  kHz,  which  is.  Therefore,  1 
suggest  that  the  autocall  frequency  in  each 
band  be  a  multiple  of  100  kHz,  and  the 
keying  rate  be  a  submultiple  of  10  kHz.  The 
contact  frequency  should  be  10  kHz  from 
the  autocall  frequency .  Naturally  the  stan- 
dard could  contain  a  high-frequency  crystal 
oscillator  to  save  space,  and  divide  it  down 
to  1 00  kHz. 

This  autocall  system  can  do  more  things 
than  most  people  would  want.  There  would 
be  a  need  for  a  number  of  different  kinds  of 
units,  with  varying  features  and  levels  of 
sophistication,  from  the  basic  SID  box  to 
the  NCS's  unit  that  can  call  any  of  dozens  of 
stations  at  the  push  of  a  button. 

I've  deliberately  avoided  discussing  the 
nitty-gritty  of  hardware  in  this  brief  article. 
The  first  priority  is  to  figure  out  what  we 
want  to  do,  before  the  FCC  hands  us 
something  that  doesn't  fit  our  needs.  The 
traffic  and  phone  patch  people  should  have 
some  relevant  comments,  in  particular 

.  .  .K6HKB/I 


DECEMBER  1973 


95 


— 


IF  YOU  REALLY  WANT  THE  BEST, 

YOU'LL  JUST  HAVE  TO  ACCEPT  THE  FACT 

THAT  ITS  GOING  TO  COST  YOU  A  UTILE  LESS 


It's  the  little  things  that 
make  a  GTX  the  value  it  is: 


Operation  over  the  entire  2-meter  band 
(including  MARS  and  CAP  frequencies) 
without  tuning 


No  automatic  shutdown  on  SWR  bridge. 
Operate  with  mismatched  antenna  with- 
out damage,  due  to  balanced  emitter  out- 
put transistors 

Lowest  AM  detection  level  of  any  com- 
parable unit  (including  many  commercial 
rigs) 


Power:  the  GTX-2  and  GTX-200  boast 
30  watts  nom,  output 


Lightweight:    manufactured   to   aviation 
industry  standards 


High-sensitivity  receiver  pre-amp  in- 
cluded as  standard  (GTX-2  and  GTX- 
200) 


lAn   phone   jack    included    as    standard 
(GTX-2  and  GTX-200) 


GTX-200 


$269.95 


(30  watts  output  power, 
nomM  up  to  100  channel 
combinations) 


GTX-2 


$259.95 


(30  watts  output  power, 
nom.,  accommodates  10 
channels) 


GTX-10 


$209. 


95 


(10     watts     output     power, 
nom.,      accommodates      10 

channels) 

*  Includes  146,94  MHz. 
Add'L  crystals  $6.50  ea. 


Don't  Let  An  Honest  Price  Scare  You  Away 
See  Your  Amateur  Dealer  Today! 


General  Aviation  Electronics,  Inc.,  4141  Kingman  Drive,  Indianapolis,  Indiana  46226  -  Area  317  -  546-1  HI 


96 


73  MAGAZINE 


CHOOSING  AND 


Peter  A.   Stark,   K20AW 
P.O.    Box   209 
Mt.    Kisco,   NY 


USING 


AN 


ELECTRONIC 
CALCULATOR 


Having  watched  the  prices  of  electronic 
calculators  drop  drastically  in  the  last 
year  or  two,  I  finally  decided  to  splurge.  It 
was  a  tricky  decision,  since  in  a  falling 
market  you  hate  to  buy  something  if  you 
suspect  that  a  month  later  youTl  be  able  to 
get  it  for  half  the  price.  Still,  I  finally 
decided  that  prices  were  close  to  the  bottom 
(which  wasn't  quite  correct)  and  took  the 
plunge.  IVe  now  been  using  my  little  gem 
for  almost  a  year,  and  hardly  a  day  goes  by 
that  I  don't  use  it  for  something  or  other  (I 
don't  doodle,  so  sometimes  I  just  sit  at  my 
desk  and  play  with  the  calculator,  finding 
the  square  root  of  my  phone  number. .  .). 

If  you  have  been  thinking  of  buying  one, 
or  already  have  one  and  want  to  know  how 
to  use  it  better,  then  read  on.  Here's  the  real 
story. 

If  you  still  don't  have  one,  then  go  out 
and  buy  one  —  otherwise  this  article  won't 
make  much  sense  to  you.  But  first,  you'll 
have  to  decide  just  how  much  of  a  calculator 
you  want.  The  most  common  ones,  sold  all 
over  the  country,  have  four  basic  functions 
—  they  add,  subtract,  multiply  and  divide. 
That's  really  all  you  need,  but  if  you  pay 
more  you  sometimes  get  more  (not  always). 
The  Cadillac  of  them  all  is  a  $400  unit  made 
by  Hewlett-Packard,  the  HP-45.  In  addition 
to  the  four  basic  functions,  this  one  also 
finds  sines,  cosines,  tangents,  inverse  sines, 
inverse  cosines,  inverse  tangents,  both  com- 
mon and  natural  logarithms  as  well  as 
antilogs  (powers  of  ten  and  exponentials), 


squares,  square  roots,  reciprocals,  factorials, 
percentages,  percent  differences,  sums  of 
squares,  mean  and  standard  deviation.  But 
that's  not  all  —  it  converts  from  degrees- 
minutes-seconds  to  decimal  degrees  and 
backwards,  it  converts  from  polar  coordi- 
nates to  rectangular  coordinates  and  back,  it 
converts  from  degrees  to  radians  and  back,  it 
converts  from  inches  to  centimeters  and 
back,  kilograms  to  pounds  and  back,  liters  to 
gallons  and  back.  It  lets  you  work  on  two 
sets  of  numbers  at  the  same  time,  it  displays 
pi  (3.14159),  and  probably  does  a  dozen 
other  things  as  well  —  all  at  the  touch  of  a 
button.  It's  a  battery-operated  unit  that  fits 
your  pocket,  and  is  an  engineer's  best  friend. 
They  call  it  an  Electronic  Slide  Rule,  but  it 
really  does  much  more  than  that.  To  extend 
the  ease  of  use  for  engineers  and  scientists, 
this  unit  includes  circuitry  for  scientific 
notation  —  the  use  of  multipliers  (powers  of 
ten)  for  very  large  and  very  small  numbers. 
All  in  all,  a  great  device. 

Another  Hewlett-Packard  calculator,  at 
the  same  price,  is  a  business  model  which 
finds  percentages,  interest  rates,  markups, 
rounds  off  to  the  nearest  cent  and  even  finds 
the  number  of  days  between  any    two  dates. 

If  you  think  $400  is  too  much,  then  a 
drop  to  $300  gets  you  either  the  HP-35, 
which  does  about  half  as  much  as  the  HP-45 
(that's  still  a  lot,  though  )  or  an  MITS 
desk -top  unit  that's  roughly  comparable. 

For  engineering  calculations,  the 
Hewlett-Packard    and    MITS    units   are  the 


DECEMBER  1973 


97 


only  widely  advertised  units  that  have  all  of 
the  trigonometric,  exponential  and  hyper- 
bolic functions  you  might  need  for  really 
serious  calculations.  But  there's  no  reason  to 
spend  that  much  if  you  are  a  non- 
professional -  for  amateur  and  household 
use  the  only  functions  that  you  will  use 
fairly  often  (besides  the  basic  add,  multiply, 
subtract,  and  divide)  are  the  reciprocal  and 
square  root-  If  you  want  to  spend  about 
$100,  you  can  get  a  Texas  Instruments  or 
MITS  unit  that  is  also  small  enough  for  a 
pocket,  and  which  does  reciprocals  and 
square  roots.  But  even  that's  a  lot  of  money. 

That  finally  brings  us  down  to  the  com- 
mon type  of  calculator,  the  one  that  most 
hams  can  afford.  So  let's  talk  about  that. 

First,  they  come  in  various  sizes.  The 
table-top  models,  being  line-powered,  can 
afford  to  use  big,  bright  readouts  and  big 
keys.  The  pocket  models  (you  sometimes 
need  big  pockets)  are  perhaps  $10  to  $30 
more  expensive,  and  use  tiny  readouts  that 
may  be  hard  to  see,  especially  in  a  bright 

light-  Some  come  with  rechargeable  batteries 
and  (usually)  external  chargers.  But  watch 
out  —  the  very  cheap  battery  models  often 
use  non-rechargeable  batteries  which  don't 
last  very  long.  They  may  seem  cheap  to  start 
with,  but  you  may  go  broke  buying 
batteries. 

Talking  about  readouts,  most  table-top 
units  use  W  or  larger  displays,  such  as  the 
Sperry  or  Burroughs  neon  readouts;  most 
pocket  units  use  ¥*"  LED  (light-emitting- 
diode)  readouts.  One  portable  unit  (the 
Lloyd,  also  available  under  other  names) 
uses  a  liquid  crystal  readout.  Aside  from  the 
fact  that  this  type  of  display  has  (at  this 
time)  a  limited  life,  the  Lloyd  calculator  is 
very  large  and  uses  non -rechargeable  D  cells. 
The  liquid  crystal  display  is  also  hard  to  see- 
When  and  if  liquid  crystals  become  cheap 
and  good,  they  will  really  cause  a  revolution 


WANTS  TO  BUY 

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in  calculator  design,  since  they  take  very 
little  power,  and  even  dry  cells  will  last  a 
long  time. 

The  next  thing  to  consider  when  choosing 
a  calculator  is  whether  it  has  a  fixed  or 
floating  decimal  point.  In  a  fixed-point 
calculator,  the  position  of  the  decimal  point 
is  either  fixed  in  the  design,  or  else  set  by  a 
small  switch  at  one  of  several  places.  In  a 
floating-point  calculator,  the  decimal  point 
will  automatically  be  placed  by  the  machine 
in  the  best  place,  depending  on  the  number. 
Basically,  the  fixed-point  models  are  good 
for  dollars  and  cents,  and  the  floating-point 
models  are  good  for  everything  else- 
Using  a  fixed-point  calculator  for  dollars 

and  cents  is  handy,  because  you  can  always 
select  exactly  two  decimal  places  in  all  of 
your  numbers,  and  also  because  most  of 
these  models  will  round  off  to  the  nearest 
cent.  For  instance,  if  you  figure  out  the  sales 
tax,  say  6%  on  $1.63,  a  floating-point 
calculator  will  give  you  an  exact  value  of 
$0-0978,  while  a  fixed-point  machine  will 
round  that  off  to  $.010.  This  is  good  for 
money,  but  not  if  you  are  going  to  calculate 
capacitor  values. 

The  most  useful  choice  is  then  a  machine 
which  allows  you  to  select  either  fixed  or 
floating  mode  (and  many,  such  as  the  $80 
Heathkit,  give  you  that  choice);  but  if  you 
have  to  go  one  way  or  the  other,  then  the 
floating-point  is  the  better  choice. 

Just  to  show  you  how  bad  the  fixed-point 
is,  suppose  you  want  to  find  reactance  of  a 
10  /iF  capacitor  at  60  cycles.  Using  the 
formula 


XC  = 


1 


27rf  C 


You  practically  have  to  stand  on  your  head 
to  do  this  on  a  fixed— point  machine  because 
10  /iF  is  actually  0.0000 1  farad  (remember, 
the  formula  holds  for  farads,)  and  most 
fixed— point  machines  won't  let  you  enter 
that  0.00001  as  a  number  -  they  simply 
round  it  off  to  something  like  0*00! 

On  the  other  hand,  if  you  use  a  floating- 
point calculator,  you  just  take  1 ,  divide  it  by 
2,  divide  that  by  n  (3.141 59265),  divide  that 
by  60,  and  finally  divide  that  by  0.00001,  to 
get  265,25  Ohms.  And  if  you  do  it  slightly 


98 


73  MAGAZINE 


differently,  you  can  get  an  even  more  precise 
answer  of  265.25823  Ohms,  though  it  prob- 
ably won't  do  you  much  good. 

Another  feature  to  look  at  is  the  number 
of  digits  you  get.  Most  inex pensive  calcula- 
tors have  eight  digits  plus  one  more  for 
either  a  minus  sign  or  an  error  indication. 
You  can  save  a  little  money  by  getting  only 
6  or  even  4  digits,  but  at  a  tremendous  loss 
of  convenience,  A  small  number  of  digits  is 
really  not  enough  for  serious  calculating. 
The  manufacturers  know  this,  and  usually 
include  circuitry  for  doing  calculations  on 
longer  numbers,  and  then  displaying  just 
part  of  the  number  at  a  time.  For  instance, 
what  may  be  the  cheapest  machine  yet  is  a 
small  Sharp  unit  that  sells  for  $38  in  Japan. 
It  offers  12-digit  calculations  -  fixed  point, 
with  nine  digits  before  the  decimal  point  and 
three  after  —  but  only  three  digit  display.  To 
see  the  whole  12  digits,  you  have  to  hit  a 
special  key  that  lets  you  see  three  digits  at  a 
time.  As  far  as  we're  concerned  the  dollar 
saving  isn't  worth  the  effort. 

But  some  units  advertise  "8-digit  display, 
16-digit     capacity."    This     doesn't    usually 

mean  what  it  sounds  like.  You  probably 
think  it  means  that  you  can  use  numbers  up 
to  16-digits  longer,  but  that's  not  so.  You 
can  still  only  use  8-digit  numbers,  but  you 
can  get  16-digit  long  answers  though  only 
accurate  to  the  left-most  8  places.  An 
example  will  display  what  we  mean. 

Suppose  you  want  to  multiply  12345678 
times  599,  which  has  a  correct  answer  of 
7395061122,  but  using  an  8-digit  machine. 
The  answer  is  10  digits  long,  so  what 
happens?  Some  machines  just  stop  and  don't 
even  try  it.  Others  will  do  it,  but  only 
display  the  left-most  8  digits  of  the  answer. 
(A  very  few  will  let  you  press  another  key  to 
see  the  right-most  digits.)  But  a  "16-digit 
capacity"  model  will  display  the  answer  as 
73.95061  IE;  if  you  know  how  to  read  it 
you're  ahead.  First  of  all,  the  E  means  error 

—  you've  done  something  you  shouldn't 
have.  The  digits  73950611  are  the  first  8 
digits  of  the  correct  answer.  And  finally,  the 
decimal  point  tells  you  how  big  the  answer  is 

—  the  instruction  manual  says  to  move  the 
decimal  point  8  places  to  the  right  —  adding 
a   few  zeroes  if  needed  -  and  you  get  the 


answer  as  about  7395061 100.  And  that's  at 
least  close. 

A  worthwhile  feature  is  a  constant  key. 
Essentially,  this  key  lets  you  enter  a  given 
number  (called  the  constant)  into  the  calcu- 
lator for  use  over  and  over  in  succeeding 
calculations.  In  most  calculators,  this  con- 
stant can  only  be  used  in  multiplication  or 
division,  though  in  some  it  can  also  be  used 
to  add  and  subtract.  This  feature  is  of  great 
help,  for  instance,  in  calculating  crystal 
frequencies  if  you Ve  an  FM  fiend. 

Suppose  you  have  a  pile  of  18  MHz 
crystals,  and  you  want  to  see  what  2m 
frequencies  they  will  transmit  on.  Since  the 
multiplication  factor  here  is  8,  you  push 
down  the  K  (constant)  key,  and  key  in  the 
number  8  x,  which  sets  up  the  constant 
function  for  a  multiplication  by  8.  To  find 
the  frequency  of  an  1 8  MHz  rock,  just  enter 
18  =,  and  you  get  the  answer  144  MHz.  To 
find  the  transmit  frequency  of  an  18.3675 
MHz  rock,  just  key  in  18.3675  =,  and  the 
answer  pops  up  as  146.94.  Notice  that  you 
don't  have  to  reenter  the  8  x  again* 

In  division,  you  can  use  a  constant 
divisor.  For  example,  you  have  to  order  a 
few  transmit  crystals  for  a  450  MHz  trans- 
mitter that  uses  a  crystal  multiplication 
factor  of  36.  To  get  the  crystal  frequencies, 
first  push  down  the  K  key,  and  enter  448.55 
-r  36  =  and  the  answer  comes  up  12.459722 
(we  sure  hope  you  have  a  fioa ting-point 
machine,  since  a  fixed-point  calculator  will 
come  up  with  12.46  which  is  about  as  useful 
as  doing  it  in  your  head).  For  the  next 
crystal  just  enter  445,05  =  and  the  answer 
appears  as  12,3625,  For  more  crystals  just 

keep  going  in  the  same  way. 

You  can  do  a  whole  series  of  divisions, 
using  the  same  divisor  y  very  fast.  But  notice 
that  this  scheme  doesn't  really  help  you  very 
much  if  you  have  to  order  receive  crystals, 
since  you  can't  use  the  constant  feature  if 
you  first  have  to  subtract  the  i-f  frequency 
and  then  divide.  Although  everyone  bally- 
hoos  the  constant  feature  in  their  ads,  it  isn't 
really  that  useful  in  most  calculations. 

But  the  constant  feature  is  useful  in  doing 
a  trick  which  sometimes  is  very  handy.  If 
you  remember  a  few  paragraphs  back  we 
mentioned  that  reciprocals  and  square  roots 
are  important,  Well,  many  units  that  have  a 


DECEMBER  1973 


99 


constant  allow  you  to  get  reciprocals  by 
pushing  a  certain  sequency  of  keys.  This, 
and  a  related  trick  for  squaring,  are  not 
advertised  and  don't  work  on  all  cheap 
calculators-  But  if  it  works  on  your  unit, 
then  more  power  to  you  —  you  are  about  to 
save  yourself  a  lot  of  work. 

First  the  trick  for  squaring.  Suppose  you 
want  to  square  a  number  like  9.  Normally 
you'd  have  to  push  3x3  =;that  is,  multiply 
the  3  by  itself ,  which  would  then  give  you 
the  answer  of  9.  Notice  how  you  have  to 
enter  the  3  twice.  But  on  some  calculators, 
when  you  push  the  first  3  x,  the  3  goes  into 
an  internal  operations  register,  and  also  still 
stays  on  the  display.  Keying  in  the  second  3 
is  then  really  a  waste,  and  if  you  go  directly 
to  the  =  key,  you  will  get  the  square,  9,  It 
doesn't  really  make  much  difference  with  3, 
but  suppose  you  want  to  square  something 
like  3.1622777  -  it  makes  a  big  difference 
whether  you  have  to  enter  the  number  once 
or  twice.  The  trick  now  —  and  remember,  it 
will  not  work  on  all  calculators  —  is  to  just 
key  in  3.1622777  x  =  and  you  get  the 
square.  This  is  a  worthwhile  trick  to  try  in 
the  store  before  you  buy  your  unit,  since  if 
you  use  your  calculator  for  electronic  calcu- 
lations you  will  often  have  to  find  square 
roots  —  and  the  best  way  of  checking  the 
square  root  is  to  square  it,  right?  The  reason 
they  don't  advertise  it  is  that  it  is  really  a 
byproduct  of  the  design  -  not  something 
purposely  designed  into  the  calculator. 

And  now  to  the  reciprocal.  Suppose  you 
want  to  find  the  reciprocal  of  a  number 
that's  on  the  display  —  you  may  have  just 
calculated  it,  and  now  want  to  find  the 
reciprocal.  The  obvious  way  is  to  write  it 
down,  and  then  key  a  1  and  divide  by  the 
number  you  have  written  down.  But  note 
that  this  requires  an  extra  step  —  you  have 
to  write  down  the  intermediate  answer.  (By 
the  way,  this  is  where  a  calculator  with 
memory  may  be  of  some  advantage,  but  you 
don't  need  it.)  The  trick  for  finding  a 
reciprocal  without  actually  doing  the  divi- 
sion into  one  is  similar  to  the  squaring  trick. 
First,  starting  with  the  number  whose  reci- 
procal you  want  to  get  on  the  display,  push 
down  the  K  key  and  then  hit  -r  -.  Just  as 
hitting  x  =  in  the  squaring  trick  multiplied  a 
number  by  itself,  so  hitting  -r  =  divides  the 


number  by  itself,  and  so  you  get  a  display  of 
I,  But  since  you're  set  to  constant,  doing 
this  also  sets  the  calculator  for  a  constant 
division  by  the  original  number.  If  you  now 
turn  off  the  constant  feature  by  releasing  the 
K  key  and  then  hit  the  =  key  one  more  time, 
you  actually  do  that  one  last  division  and  get 
1  divided  by  the  original  number  -  the 
reciprocal. 

Now,  why  is  the  reciprocal  so  useful 7 
Let's  show  you  with  an  example.  Suppose 
you  want  to  find  the  equivalent  resistance  of 
two  resistors  in  parallel,  one  of  them  1  2K 
and  the  other  68K.  The  well-known  formula 
is  the  "product  over  the  sum," 

«  t        „      1 2K  x  68k. 

Equivalent  R  -  12K  +  68K 

The  problem  is  that  you  first  have  to  add 
up  the  two  resistors  on  the  bottom,  save  that 
answer,  then  multiply  out  the  two  resistors 
on  the  top  and  divide  by  the  sum  you've 
saved.  If  you  have  a  calculator  with  memory 
it's  easy  to  save  that  intermediate  answer, 
but  otherwise  you  have  to  do  it  separately 
and  write  it  down  (though  in  this  case  it's 
easy  to  remember,  8QK).  But  with  the 
reciprocal  you  do  the  problem  backwards: 


1 


12Kx68K^ 

12K  +  68K      12K  +  68K 


x  12Kx68K 


See,  you  break  up  the  problem  like  this: 
First  add  12K  to  68K  to  get  80K.  Then  find 
its  reciprocal  (0.0000125)  and  right  away 
multiply  it  by  12K  and  by  68K. 

Well,  now  that  we've  covered  the  most 
important  features  of  the  common  garden- 
variety  of  calculator  and  some  of  the  tricks 
we  can  do  on  some  of  them  (hint  -  if  you 
haven't  bought  a  calculator  yet,  take  this 
article  with  you  when  you  go  and  try  out 
the  squaring  trick  and  reciprocal  trick  in  the 
store  to  make  sure  you  get  one  that  works  ) 
let's  look  into  more  tricks  for  making  our 
calculations  easier.  Let's  go  back  to  the 
parallel  resistor  problem, 

12Kx68K 


12K  +  68K 


and  let's  do  it  the  long  way.  12K  +  68K  on 
the  bottom  is  80K,  so  we'll  write  it  down. 


100 


73  MAGAZINE 


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Handheld  Calculator 

..8  Functions  Mean  a  Handful  of  Features! 


Multiplication 


Division 


Subtraction 


Square  Roots 


Squaring 


Reciprocals 


Percentages 


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Chain  &  Mixed  Operations 

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Addition 


SIZE:  5-3/4"  x  3-1/4"  x  1-1/2 


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SOS/265-7553  Telex  Number  660401 


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J 


Now  let's  multiply  12K  x  68K.  Oh,  your 
calculator  doesn't  have  a  KH  key?  Well,  of 
course  K  means  1000,  so  I2K  becomes 
I  2000  and  68K  becomes  68000  when  you 
key  in  the  numbers.  Good,  here  we  go. 

12000  x  68000  =  8.1600000E 

Hmmmm!  The  product  happens  to  be  over  8 
digits  long,  and  so  we  got  that  funny 
readout.  Now  what?  A  good  thing  to 
remember  is  that  our  formula  will  work  for 
Ohms,  kilohms,  megohms,  even  milliohms. 
Just  make  sure  that  all  of  your  resistors  are 
expressed  in  the  same  units,  and  the  answer 
comes  out  in  the  same  units.  What  this 
means  is  that  we  can  skip  the  K  and  do  this: 


1  2  x  68 

1  2  +  68 


=  10.2 


omitting  all  the  K's,  and  this  gives  us  an 
answer  also  in  K.  Hence  the  answer  is  10.2 
K12. 

As  another  example,  suppose  you  put 
100  K  in  parallel  with  1  M£2,  Since  100  K  is 
.1  MR,,  you  could  do  the  calculation  like 
this: 


.1  x  1 


.1 


=    0,090909  M£2 


J  +  1  1.1 

=  90.909KU 
Still  another  way  of  doing  the  problem  is 

to    note    that,    though    the    formula    says 

"product  over  the  sum,"  we  don't  have  to 

do  it  just  in  that  order.  We  could  break  up 

the  original  problem  like  this; 


12Kx68K 


i:k 


_  1  2K 
1 2K  +  68K  1 2K  +  68K  x  68K  ^"SOK^  68K 

Doing  it   in  this  order  keeps  the  numbers 

from  getting  too  big.  1 2K  divided  by  80K 

(which      you     can     do     either     by     doing 

12000^80000  or  as  12^80) gives  0.15,  and 

then    multiply    it    by    68000    gives    10200 

Ohms. 

Another  useful  trick  is  to  remember  that: 

kilo  x  milli  =  1 
mega  x  micro  =  1 

These  are  obvious  when  you  realize  that;  for 
instance,  kilo  means  1000  and  milli  means 
0.001 ;  multiply  them  out  and  you  get  1 . 

For    instance,    you    want    the    RC    time 
constant    of  a    0*001    microfarad   capacitor 


with  a  100  K  resistor.  The  textbook  says 
that  the  RC  formula  has  to  have  R  in  Ohms 
and  C  in  farads,  but  0.001  microfarads  is 
0.000000001  farads,  and  that's  over  8  digits 
long  so  you  can't  enter  it.  But  since  mega  x 
micro  =  I,  convert  the  100  K  resistor  to  0.1 
megohm,  and  use  the  0,001  microfarad  as  is: 


0.1  MSI  x  0,001  juF  =  0.001  second 

Another  example  will  bring  it  out  better. 
You  want  to  know  the  reactance  of  a  47  pF 
capacitor  at  6.125  MHz.  Well,  the  standard 
formula  for  capacitive  reactance  is, 

1 


XC  = 


2wf  C 


where  f  is  supposed  to  be  in  Hertz  and  C  is 
supposed  to  be  in  farads.  Great  —  what  do 
you  do  with  a  0.000000000047  farad  capac- 
itor if  you  only  have  an  8-digit  calculator? 
Simple  —  use  Megahertz  and  microfarads: 


XC  = 


I 


2x  3,1415926  x  6,125  x  0.000047 


(this  is  where  that  S400  calculator  would 
come  in  useful  -  just  enter  it  as  47  x  10"! 2 
and  you've  gotten  out  of  it!)  Now  you  could 
either  multiply  out  the  whole  denominator 
and  then  find  its  reciprocal,  or  an  easier  way 
is  to  take  1,  divide  by  2,  divide  by 
3.1415926,  divide  by  the  6.125,  and  finally 
divide  the  result  by  0.000047,  which  gives 
you  the  answer  of  552.85957  12. 

And  now  on  to  the  real  good  stuff  — 
what  about  square  roots?  You  say  you  don't 
need  them?  WelL  what  do  you  do  when  you 
want  to  find  the  resonant  frequency  of  an 
LC  circuit  from  the  formula: 


f  = 


1 


InyfLC 


How  do  you  find  \JhCl  Or  you  want  the 
voltage  across  a  5012  resistor  when  the 
power  in   it  is    1    watt   —   the  equation  for 

power  is: 


P  =  E    /  R 

So,    E   =  \/PR.   There    must   be  dozens  of 
electrical    equations    which    require    square 


102 


73  MAGAZINE 


roots.  You  could  of  course  plunk  down  $$$ 
for  an  expensive  calculator  doing  them,  but 
it  turns  out  that  a  simple  procedure  can  find 
the  square  roots  even  on  a  simple  calculator. 
To  see  how  it's  done,  let's  try  a  real  simple 
example  -  finding  the  square  root  of  1 6. 

Not  having  a  square  root  calculator,  we 
could  start  out  by  trying  a  few  guesses. 
Suppose  we  try  a  guess  of  3,  and  check  it  by 
squaring  3x3=9.  Nope,  3  was  too  small  a 
guess.  Try  3.5,  then  3,5  x  3.5  =  1  2.25.  Nope, 
still  too  small,  but  getting  closer,  right?  Well, 
we  could  try  3.8,  maybe? 

At  this  rate  you  might  go  on  a  long  time 
before  you  get  there.  But  suppose  we  told 
you  that  it  wasn't  such  a  harebrained  scheme 
—  that  there  was  a  valid  mathematical 
method  that  does  just  this,  and  that  its 
secret  is  the  presence  of  a  formula  that  tells 
you  what  guesses  to  try?  It's  usually  buried 
in  obscure  textbooks  on  numerical  methods 
under  the  name,  Newton-Raphson  Iteration, 
and  it  goes  like  this: 

First,  take  a  guess  at  the  square  root.  Try 
to  take  a  good  guess,  but  don't  worry  if 
you're  pretty  far  off*  For  the  sake  of  this 
discussion,  we're  going  to  use  3  as  a  guess  for 
the  square  root  of  16. 

Take  the  3  and  divide  it  into  the  16  on 
your  calculator: 


that  guess  into  that  number.  Well,  as  the 
next  guess,  why  not  try  the  average  of  these 
two?  We  do  this  by  adding  the  guess  to  the 
quotient  and  then  dividing  by  2,  like  this: 


Number 
2nd  guess  =     1  st  guess 


+  1st  guess 


Number 
3rd  guess  =    2nd  guess         ^ncl  8uess 

2 


4th  guess  = 


Number 
3rd  guess 


+3rd  guess 


16 


mm  *?  *  j^  j  j  j  -j  ^  -j? 


It  turns  out  that,  no  matter  how  bad  our 
first  guess  is,  the  second  is  always  more 
accurate,  the  third  is  even  better,  and  so  on. 
If  the  original  guess  is  pretty  close,  then  as 
few  as  two  or  three  repetitions  of  this 
formula  will  give  you  the  right  answer  within 
the  accuracy  of  your  calculator.  Usually,  out 
of  the  first  8  digits  on  the  calculator,  the 
first  7  will  be  correct  and  the  last  one  may 
be  slightly  off,  but  even  this  is  within 
something  like  0,0001%,  and  that's  close 
enough. 

For  instance,  let's  complete  our  example 
above:  16  divided  by  3  is  5,3333333,  so: 


Now  look  at  what  you  did.  Suppose  you  had 
taken  the  right  guess  (4)  and  divided  it  into 
16  —  the  answer  would  have  then  been  4, 
right?  A  number,  divided  by  its  square  root 
is  always  equal  to  the  square  root  (16  -r4  = 
4,  25  +  5 '  =  5,  and  so  on). 

But,  of  course,  we  weren't  that  lucky, 
since  we  had  a  bad  guess.  Our  guess  will 
usually  be  either  too  small  or  too  large.  In 
this  case  3  was  too  small  a  guess.  So  what 
happens  when  we  do  the  division?  The 
answer  comes  out  too  large!  Here  3  is 
smaller  than  the  real  square  root,  while 
5.3333333  is  too  large.  (Had  our  guess  been 
too  large  *  then  the  quotient  would  have  been 
too  small.)  Either  way,  the  actual  square 
root  is  somewhere  between  the  guess  we 
take  and  the  quotient  we  get  when  we  divide 


16 

3- 


+  3 


5.3333333  +  3     8.3333333 


2  2  2    =4.166666 

Notice  that  this  is  a  lot  closer  to  4  than  the 
original  guess  was.  Repeat  it  again: 


16 


4. 1666666 


+  4,1666666 


=  4,0033333 


and  again: 


16 


4,0033333 


+  4.0033333 


=  4.0000013 


DECEMBER  1973 


103 


and  again: 


4.0000013 


+  4.00000 1  3 


=  4.0000000 


And  there  you  are  —  the  right  answer  after 
four  repetitions.  Actually,  the  entire  repeti- 
tion of  the  formula  can  be  done  in  a  few 
seconds,  so  it  is  quite  an  easy  process  when 
you  get  the  hang  of  it.  How  do  you  know 
when  to  stop?  Simple  —  when  the  numbers 
start  to  repeat  themselves. 

Just  to  show  you  how  easy  it  is,  let's  try 
it  again,  this  time  to  find  the  square  root  of 
10.  Try  3.2  as  the  first  guess: 


digits  like  16  77  72  16.  Since  there  are  four 
groups  of  two  digits,  the  guess  should  have 
four  digits  in  it.  But  even  better,  since  the 
square  root  of  the  first  group  (16)  is  about 
4,  make  the  first  digit  of  the  guess  a  4. 
Hence,  a  good  guess  would  be  4000  or  a 
little  more  (the  actual  square  rool  of 
16,77721 6  is  4096), 

As  another  example,  for  the  square  root 
of  0.00000007,  break  it  up  as  0.  00  00  00 
07  and,  since  the  square  root  of  07  is 
somewhere  around  3,  use  0.0003  as  a  guess. 

This  last  example  shows  another  problem 
-    0.00000007   is   too   long   for  an  8-digit 

calculator-  The  best  way  to  find  its  square 
root  is  to  break  it  up  into  two  parts,  perhaps 
something  like: 


10 

iii  +  n 

3.2  =3.1625 


« 


i 


10 


3.1625 


+  3.1625 


=  3.1622776 


10 


3.1622776 


-+3.1622776 


—  3. 1  622776 


You  are  starting  to  repeat  yourself,  so  it's 
time  to  stop.  The  actual  square  root  is  a  bit 
closer  to  3.1622777,  but  we  are  as  close  as 
we  can  get  on  an  8-digit  calculator. 

In  this  case  it  took  us  only  three  tries  to 
get  the  answer  —  in  general,  the  closer  your 
first  guess,  the  faster  you'll  get  to  the 
answer.  But  if  your  first  guess  is  real  bad,  it 
doesn't  mean  that  your  answer  will  be  any 
less  accurate  —  it  only  takes  a  little  longer  to 
get  it. 

On  very  large  or  very  small  numbers  it 
may  be  a  little  hard  to  get  a  good  first  guess. 
The  trick  here  is  to  break  up  the  number 
into  groups  of  two  digits,  starting  from  the 
decimal  point,  and  have  one  digit  in  the 
guess  for  each  group  of  two  digits  in  the 
original  number. 

For  instance,  for  the  square  root  of 
16,777,216,  break  it  up  into  groups  of  two 


0.00000007  =  0.07  x  0,000001 

Find  the  square  root  of  each  part  separately, 
and  then  multiply  out  the  square  roots.  The 
square  root  of  0#07  here  is  .2645751,  while 
the  square  root  of  0.000001  is  0.001; 
multiply  the  two  out  and  you  get 
0.0002645751  as  the  square  root.  Finding 
the  square  root  of  0.000001  is  really  easy  if 
you  know  scientific  notation,  since 
0.000001  is  10"6,  and  the  square  root  of 
that  is  automatically  found  to  be  10"3  but 
that* s  another  subject. 

As  our  last  set  of  tricks,  we  will  describe 
some  formulas  you  can  use  if  you  want  to 
find  things  like  sines,  cosines,  tangents  and 
exponentials  (powers  of  e).  You  could,  of 
course,  look  these  up  in  a  table,  or  else  get 
the  $300  or  $400  calculator,  but  if  you  use 
the  following  formulas  you  will  get  answers 
almost  as  accurate.  Obviously,  if  you  don't 
know  what  these  are,  then  you  probably 
don't  need  them.  But  if  you  do,  they  might 
be  handy.  By  the  way,  if  you  would  like  to 
look  up  the  derivations  of  these,  they  may 

be  found  in  most  textbooks  on  numerical 
methods  (such  as  reference  1 )  under 
Maclaurin  series,  using  Horner's  rule,  with 
angles  converted  from  radians  to  degrees.  So 
here  goes:  for  the  sine  and  cosine,  with  an 
angle  X  in  degrees  (only  angles  between  0* 
and  90°  will  work  accurately;  for  other 
angles  you  will  have  to  convert  to  an  angle 
between  0*  and  90°),  use  the  following 
formulas; 


104 


73  MAGAZINE 


sin  X  = 


57.295779 


1  - 


X 


19696.83 


X 


X 


65656  A  24 


137877.86 


CALCULATING     THE 
DO  THIS   (STARTING   FROM  THE  TOP) 

Clear  the  machine 

Enter  30  degrees 

square   it 

and  divide  it 

by   137877.86 

and  make  it  negative 

Now  add  1 

Multiply  by  30 

Multiply  by  30 

and  again  by  30 

and  again  by  30 

and  divide  it 

by  65656.124 

and  make  it  negative 

Now  add  1 

Multiply  by  30 

Multiply  by  30 

and  again  by  30 

and  again  by  30 

and  divide  it 

by  19696,837 

and  make  it  negative 

Now  add  1 

Multiply  by  30 

Multiply  by  30 

and  divide  it 

by  57,295779 

and  get  the  final  answer  by  pushing  = 


SINE   OF  30  DEGREES 


BY  PUSHING 

C 

30 
x- 

137877.86 

1+ 

x 

30 

x 

30 

* 

65656.124 

1  + 

x 

30 

x 

30 

* 

19696.837 

1+ 

x 

30 

57.295779 


AND  DISPLAY  SHOWS 

0. 

30. 

900. 

900. 

137877.86 

-0.0065275 

0.9934725 

0.9934725 

30. 

29.804175 

30. 

894.12525 

65656.124 

-0.0136183 

0.9863817 

0.9863817 

30. 

29.591451 

30. 

887.74353 

19696.837 

-0.0450703 

0.9549297 

0.9549297 

30. 

28.647891 

57.295779 

0.5 


cos  X  =  1  - 


X 


X 


1  - 


X 


6565.6124"     393  93. 672  V     98484  A  8 


CALCULATING  THE 

DO  THIS  (STARTING  FROM  THE  TOP) 

Clear  the  machine 
Enter  60  degrees 
square  it 
and  divide  it 
by  98484.18 
and  make  it  negative 
Now  add  1 
Multiply  by  60 
multiply  by  60 
and  again  by  60 
and  again  by  60 
and  divide  it 
by  39393.672 
and  make  it  negative 
Now  add  1 
multiply  by  60 
multiply  by  60 
and  again  by  60 
and  again  by  60 
and  divide  it 
by  6565.6124 
and  make  it  negative 
and  finally  add  1 


COSINE  OF  60  DEGREES 

BY  PUSHING  AND  DISPLAY  SHOWS 


c 

0. 

60 

60. 

x= 

3600. 

■ 

3600. 

98484.18 

98484.18 

=  — 

-0.036554 

1  + 

0.963446 

X 

0.963446 

60 

60. 

X 

57.80676 

60 

60. 

* 
• 

3468.4056 

39393.672 

39393.672 

=  _ 

-0.0880447 

1  + 

0.9119553 

X 

0,91 19553 

60 

60. 

X 

54,717318 

60 

60. 

* 

• 

3283.039 

6565.6124 

6565.6124 

—  — 

-0.5000354 

1  + 

0.4999646 

DECEMBER  1973 


105 


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Both  of  these  formulas  can  be  done  in 
one  long  series  of  calculations  without 
writing  down  any  intermediate  answers,  but 
starting  from  the  right  and  working  to  the 
left*  For  example:  To  get  the  sine  of  30° 
(the  exact  answer  is  .5000000),  or  to  get  the 
cosine  of  60 D  (also  an  exact  answer  of 
.5000000)  we  proceed  as  in  the  Table.  Each 
of  these  formulas  is  very  accurate  for  small 
angles,  and  becomes  slightly  worse  at  large 
angles.  To  find  the  tangent  of  an  angle,  find 
both  the  sine  and  the  cosine  and  then  divide 
the  sine  by  the  cosine. 

To  find  the  values  of  of  ex  (expon- 
entials) for  values  of  x  less  than  1,  and  with 
an  accuracy  of  about  0.1%,  use  the  following 
formula: 


case  you  want  to  try  your  luck  on  your 
calculator,  the  value  of  e  (calculated  from 
the  above  formula  by  letting  X  equal  1)  is 
supposed  to  be  2/7180555;  not  bad. 


,x  = 


1  +X{1  + 


I  + 


X 


I  +x 


(>+K'+ 


As  before,  we  start  from  the  right  and  go 
toward  the  left,  in  the  sequence:  Take  X, 
divide  by  6,  add  1 ,  multiply  by  X,  divide  by 
5,  add  I,  etc.  As  before,  we  get  better 
accuracy  when  X  is  quite  a  lot  less  than  1 .  In 


Conclusion 

If  we  haven't  confused  you  completely 
by  now,  then  consider  yourself  lucky.  The 
moral  of  the  story  is  that  even  an  expensive 
calculator  won't  do  your  thinking  for  you, 
but  if  you  know  how  to  juggle  numbers  then 
it  can  really  make  your  life  easier.  Hope- 
fully, the  above  information  will  help  you 
make  a  little  better  use  out  of  your  unit  and 
you  will  soon  find,  as  we  have,  that  these 
little  critters  are  more  fun  than  a  barrel  of 
monkeys.  If,  on  some  rainy  afternoon,  you 
have  nothing  better  to  do,  why  don't  you 
try  to  find  the  square  root  of  your  telephone 
number? 

•  .  .K20AW 

REFERENCE: 

(1)  Introduction  to  Numerical  Methods  by 
Peter  A.  Stark,  MacMitlian  Co.,  1970.  Make 

the  author  real  happy  by  going  right  out  and 
buying  a  couple  of  copies! 


106 


73  MAGAZINE 


There  have  been  dozens  of  papers 
_  written  on  designn  and  construction  of 
CW  audio  filters*  This  type  of  filter  can 
allow  a  marginal  receiver  to  perform 
acceptably  and  a  fine  receiver  can  be  further 
improved.  Today's  crowded  bands  makes  a 
selective  receiver  system  mandatory.  The 
published  articles  vary  from  passive  filters  to 
complex  active  filters,  with  center  fre- 
quencies from  200  Hz  to  1 020  Hz,  and  with 
bandwidths  from  30  Hz  to  600  Hz.  The 
object  of  this  article  is  to  present  sufficient 
design  criteria  and  experimental  data  to 
allow  the  perspective  builder  of  a  CW  audio 
filter  to  guide  his  design  towards  a  filter  that 
is  optimum  for  his  particular  operating 
needs.  This  is  not  a  construction  article  and 
the  design  criteria  apply  equally  well  to 
passive  and  active  filters. 

Fig.  1  shows  a  normalized  plot  of  a 
bandpass  filter,  typical  of  the  type  used  in 
CW  filters.  The  bandwidth,  or  selectivity,  for 
this  type  of  filter  is  usually  specified  at  the 
— 6  dB  point.  From  the  curves  of  Fig.  1  f  it 
can  be  seen  that  the  normalized  bandwidth 
is  determined  by  the  Q  of  the  filter.  This 
relationship  is: 

n  _  *o,    _  Resonance  Frequency 
g        /Ar     -6  dB  Bandwidth 

Since  amateur  operators  are  primarily 
interested  in  an  absolute  filter  bandwidth  in 


-6dB  BANDWIDTH 


-60 


.1 


,2         M     4    5   6  7B3W       15  2.0       30 

FREQUENCY    f/f0 


&0     70    10,0 


AR  Stabler  W6AGX 
5521  Big  Oak  Drive 
San  Jose,  CA  951 29 


OPTIMUM 

CW 
FILTER 

DESIGN 


Fig.   1.  Band-pass  transfer  characteristics  normal- 
ized for  unity  gain  and  frequency. 


DECEMBER  1973 


107 


a.  Fo  -  300  Hz 


biFo*  800  Hz 


c  Fo  =  ISOOHz 


d  Fo  -  2000  Hz 


Fig.  2.  Keyed  wavefoim  of  CW  filters  with  50Hz  bandwidth  and  center  frequencies  of  300t  800,  1500 
and  2000  Hz.  (Horiz.  ~  20  msec/cm). 


Hz  rather  than  a  normalized  bandwidth,  it's 
apparent  that,  for  a  fixed  Q,  the  absolute 
bandwidth  will  decrease  in  direct  proportion 
to  the  resonant  frequency  of  the  filter. 

An  experimental  investigation  was  made 
to  determine  the  effects,  if  any,  of  variations 

of  center  frequency  while  maintaining  a 
constant  filter  bandwidth  of  50  Hz.  This 
data  is  shown  in  Fig.  2a,  b,  c,  d.  These 
figures  show  the  shape  of  a  keyed  waveform 
after  passing  through  the  filter.  It's  interest- 
ing to  note  that  the  rise  and  fall  times  (rise 
time  is  the  time  required  for  the  filtered 
waveform  to  go  from  1 0%  to  90%  of  its  full 
value)  of  the  waveform  are  the  same,  regard- 
less of  the  center  frequency.  This  indicates 
that  for  a  fixed  filter  bandwidth,  the  per- 
formance is  independent  of  center 
frequency,  even  though  the  Q  of  the  filter 
ranged  from  4  at  200  Hz  to  20  at  1 ,000  Hz. 


Lubkin(2)has  shown  that  the  rise  time,  or 
fall  time  of  a  filter,  subjected  to  a  pulse 
input  is  approximately: 

.342  to  .570 


Rise  Time  =  At  = 


1/2  x(  -6  dB  Bandwidth) 


For  the  data  of  Fig.  2,  this  equation 
predicts  a  rise  time  from  13,7  to  22.8 
millisecs,  which  is  close  to  that  shown  in  Fig. 
2. 

Since  rise  time  is  intimately  realted  to  the 
bandwidth  of  the  filter,  it  can  slso  effect  the 
intelligibility  of  the  transmitted  information. 
If  the  rise  time  is  long  compared  to  the 
length  of  a  transmitted  puke,  dot  or  dash, 
the  signal  will  sound  distorted  and  could  be 
difficult  to  copy.  The  rise  time  should  not 
be  longer  than  the  time  required  for  the 
shortest  pulse;  an  acceptable  criteria  is  a  rise 
time  equal  to  1/2  the  length  of  the  shortest 
pulse* 


108 


73  MAGAZINE 


The  Morse  Code,  being  a  series  of  dots, 
dashes  and  spaces,  looks  much  like  a  square 
wave-  This  square  wave  can  be  represented 
by  the  sum  of  a  series  of  sine  waves;  a 
Fourier  series.  This  Fourier  series  will  con- 
tain the  odd  harmonics  of  the  fundamental 
frequency.  Including  the  first  through  the 
seventh  harmonic  in  this  series  gives  a  good 
representation  of  a  square  shaped  wave.  For 
Morse  Code,  represented  by  a  Fourier  series 
with  the  seventh  harmonic  and  the  2  samples 
per  cycle  required  by  Shannon^  criteria,  the 
lowest  audio  frequency  that  can  be  used  to 
receive  code  is  14  times  the  frequency 
corresponding  to  the  dot  period.  The 
frequencyof  the  Morse  Code  square  wave  is  a 
function  of  the  code  speed  with  the  dot 
period  determining  the  frequency  (the  space 
between  dots  is  equal  to  a  dot,  dashes  are  3 
dots,  spaces  between  letters,  2  dots,  etc.). 
The  CW  signal  is  received  as  an  interupted 
audio  frequency  sine  wave,  with  the  square 
wave    code    pattern    being    the    amplitude 

envelope  of  this  sine  wave. 

This  representation  of  a  square  wave  by  a 

sine  wave  is  essentially  a  sampling  technique 

and   Shannon's   Law  states  that  it  takes  a 

minimum  of  2  samples  per   cycle   of  the 

highest  frequency  persent  to  convey  enough 

information  to  be  able  to  reconstruct  the 

original  wave  form* 

The  average  letter  of  the  alphabet, 
numbers,  and  punctuation,  has  an  equivalent 
length  of  11.3  dot  periods  (2  dot  periods 
make  one  square  wave  cycle).  For  average  5 
letter  words  the  frequency  of  the  dot  period 
is  a  function  of  code  speed, 


500r 


h     400- 


f0-l4X.63VWPM 


15        20       25       30      55 
UODE  SPEED  WPM 


55 


3,  Minimum  center  frequency  required  to 
accurately  reproduce  a  keyed  waveform;  Morse 
Code  wpm. 


J25r 


20     25       30       35      40 

CODE  SPEED -WPM 


55 


Fig.  4.  Minimum  allowable  -6dB  filter  bandwidth 
to  acceptably  pass  a  keyed  waveform  vs*  code 
speed. 


Dot  Frequency  =  *d 


A  wpm        5  (I  L3) 

12 

2 

Space 
Between 
Letters 

7 

60                 2 
Letters 

■ 

wpm  (37.5) 

2 
Space 

Between 
Words 

*a  60  =  .63  wpm 

For  25  WPM,  fd  =  15.8  Hz,  therefore  the 
minimum  frequency  required  to  reconstruct 
a  Morse  Code  wave  form  is: 

fo  =  14  x  fd  or  221  Hz  for  25  wpm 

This  equation  is  plotted  as  minimum  center 
frequency  vs.  Code  speed  in  Fig.  3. 

Now  that  we  nave  an  expression  for  the 
frequency  of  the  Morse  Code  as  a  function 
of  code  speed,  we  can  now  relate  the  rise 
time  and  filter  bandwidth  to  code  speed. 
The  criteria  suggested  is  to  set  the  rise  time 
to  be  less  than  1  /2  of  the  dot  time. 

Dot  Frequency  -  *d  =  .63  x  wpm 


Dot  Period  = 


1 


1 


2  f^       1 ,26  x  wpm 


Max  Rise  Time  = 


•40 


1/2  x  (-6db  B.W.) 


Rise  Time  = 


.40 
(-6 db  Bandwidth)  x  1/2 

1  --L  JL 

2  (dot  period)     2  x  L26  x  wpm 


DECEMBER  1973 


109 


OF 


_  |G\TAL 
CONTROL 

REPEATERS 


T 


A0IH7 


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repeater  control  system  (or  who 
wants  to  just  think  about  doing 
that).  Contains  sections  on  repeat- 
ers, basic  logic  functions,  logic  cir- 
cuit design,  control  systems,  sup- 
port circuits,  mobile  installations, 
touchione,  plus  a  special  section  on 
a  "mini"  repeater  control  system. 
224  pages. 

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|      73  Magazine,  Peterborough  NH  03458      ] 

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Fig.   5.    Threshold  of  audibility  of  the  ear  as  a 
function  of  frequency  and  age  of  listener. 

Minimum  BW  =  2.02  x  WPM  which  is  a 
bandwidth  of  20  Hz  at  10  WPM  and  50  Hz 
at  25  WPM-  This  data  is  plotted  in  Fig.  4. 

Beranek  4  has  shown  that  the  human  ear 
acts  as  a  bandpass  filter  to  incoming  sounds 
(see  Fig.  5).  Since  this  natural  filter  must  be 
inserted  after  an  audio  filter,,  the  net  filter 
response  will  be  the  result  of  these  two 
filters  in  a  series.  To  obtain  the  best  overall 
filter  response  one  should  choose  a  center 
frequency  for  the  CW  audio  filter  that 
corresponds  to  peak  sensitivity  of  the  ear, 
Le.,  approximately  700  Hz  for  a  middle  aged 


Summary 

It  has  been  shown,  for  a  CW  audio  filter, 
that  there  is  a  minimum  center  frequency 
and  bandwidth  required  to  pass  a  keyed 
waveform  that  is  representative  of  the  input 
Morse  Code  and  that  these  minimum  values 
increase  with  increasing  code  speed.  It  was 
also  shown,  for  fixed  Q  components,  that  a 
low  center  frequency  will  yield  a  narrow 
bandwidth  filter.  The  optimum  center 
frequency  was  determined  by  matching  it  to 
the  peak  response  of  the  eai,  I  hope  that  this 
article  will  aid  CW  filter  designers  to  design 
and  construct  filters  that  are  well  matched 
to  their  operating  needs. 

W6AGX 


•  •  » 


References 

(1)  Reference  Data  for  Radio  Engineer,  H.W. 
Sams  &  Co..  Ind.,  Ind.,  1 968 

(2)  Lubkin,  Y.I.,  "More  on  Maximally  Flat 
Dealy  Networks",  Electronic  Design,  Pp 
101.  102.  11  May  196^ 

(3)  Shannon,  C.E.,  "Communication  in  the 
Presence  of  Noise",  Proc.  I.R.E.,  Vol.  37, 
No.  1,  Pp  10-21,  Ian.  1949 

(4)  Beranek,  L.L.  "Acoustics",  McGraw  Hill 
New  York,  1954 


110 


73  MAGAZINE 


DRUSH  ORUSH 


DRUSH 


(check  one) 


State 


ZIP 


enclosed 


TRANSCEIVER 


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□  Trio  TR  7200 


TRANSMIT        PAIR 

RECEIVE 

D 

146.01-61 

G 

n 

146  04-64 

O 

D 

146.07-67 

D 

a 

146.10-70 

D 

a 

14613-73 

a 

a 

146.16-76 

a 

D 

146.19-79 

o 

146  22-82 

a 

a 

146.25-85 

D 

i 

146.28-88 

a 

1 1 

146.31-91 

a 

1 1 

146.34^94 

p 

1 1 

146.37-97 

D 

u 

146.40-147,00  □ 

a 

146.52-52 

□ 

p 

146.94-94 

a 

147,00-00 

a 

G 

147.99-39 

a 

a 

147,96-36 

a 

a 

147,93-33 

a 

a 

147.90-30 

a 

u 

147.87-27 

a 

a 

147.84-24 

a 

a 

147.81-21 

D 

1 1 

147.78-18 

a 

□ 

147.75-16 

D 

a 

147.72-12 

a 

a 

147,69-09 

D 

a 

147.66-06 

1 1 

i  i 

147.63-03 

a 

u 

147.60-00 

a 

TOTAL 

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&*\v\ 


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Cassette 

Code 


Courses 


these  code  courses  from  73  the  average  person 
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1074  So.  Brawley 
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CC  RULES 
AND  REGULATIONS 


PART 


97 


Continuing  from  last  month  the  complete  text  of  the  FCC  Rules  and  Regulations  pertaining 
to  the  Amateur  Radio  Service, 


Subpart   E — Prohibited   Practices   and 
Administrative    Sanctions 

pKoiiioiT£i>  Transmissions  anu  Practices 

07*113  No  remuneration  for  use  of  Nation. 

!*7.U3  Broadcasting  prohibited 

07.11-1  Thin!  party  traffic. 

07.115  Musir  prohibited, 

S)7.11t>  Aiiuitiii  i"     nidiocnimnnnh  alkm 

purposes  prohibited. 

1)7.117  Codes  and  ciphers  prohibited, 

07,110  Obscenity,  indecency,  profanity. 

1(7.1- 1  Falsi*  signals. 

07.123  Unidentified  < «  -mmunkations. 

0T. 125  Inter  tVren  re. 

[17.1-7  Damage  to  u\  paratu^ 

07.120  Fraudulent  licenses. 


for    unlawful 


1*7.133 

07.185 

:<7.137 


Subp 


Sec. 
!i7,l<n 

i#7.ni:? 
117.183 

'.»7.1>7 

UT.ls'.i 
'J7.1!>1 


Admimm  native  Sanctions 

Restricted  operation. 
Second  notft  e  of  same  violation. 
Third  notice  of  same  violation, 
Answers  to  notices  *>f  violations. 

art   F — Radio   Amateur  Civil   Emergency 
Service   (RACES) 

Nature  f>f  tills  wftri<&« 
Definitions 

Silicic  application  for  all  equipment  tinder  one 

antnU'iir  Station  lh-en> 
Issnunce  of  slafnui  authorization. 

'IVnu  of  station  authorization. 
Cancellation  of  station  authorization. 


SUBPART  E— PROHIBITED  PRACTICES  AND 
ADMINISTRATIVE  SANCTIONS 

Prohibited  Transmissions  and  Practices 

§97.112    No  remuneration  for  use  of  station. 

An  amateur  station  shall  not  be  nsed  to  transmit  or 
receive  messages  for  hire,  nor  for  communication  for 

material    compensation,    direct    or   indirect,   paid   or 

promised. 

^Former  §97J/1  redes,  as  &97J12  eff,  10-17-72;  VI 
{72)-lJ 

§97.113    Broadcasting  prohibited* 

Subject  to  the  provisions  of  §  97.91,  an  amateur  sta- 
tion shall  not  he  used  to  engage  in  any  form  of  broad* 
casting,  that  is,  the  dissemination  ot  radio  communica- 
tions intended  to  he  received  by  the  public  directly  or 
by  the  intermediary  of  relay  stations,  nor  for  tie  re- 
transmission by  automatic  means  of  programs  or  sig- 
nals emanating  from  any  class  of  station  other  than 
amateur.  The  foregoing  provisions  shall  not  be  con- 
strued to  prohibit  amateur  operators  from  giving  their 
consent  to  the  rebroadcast  by  broadcast  stations  of  tbe 
transmissions  of  their  amateur  stations,  provided,  that 
the  transmissions  of  the  amateur  stations  shall  not  con- 
tain any  direct  or  indirect  reference  to  the  rebroadcast* 

§  97 .1 1  \     Third  party  traffic. 

The  trnnsmUsion  or  delivery  of  (lie  following  a  ma* 
teur  radii KMiiumiiuicat ion  i*  prohibited: 


la)  international  third  party  traffic  except  with 
countries  which  have  assented  thereto; 

<h)  Third  party  traffic  involving  material  compen- 
sation, either  tangible  or  intangible,  direct  or  indirect, 
to  a  third  party,  a  station  licensee,  a  control  operator, 
or  any  other  person, 

(c)  Except  for  an  emergency  communication  as  de- 
fined in  this  part,  third  party  traffic  consisting  of  busi- 
ness communications  on  behalf  of  any  party.  For  the 
purpose  of  this  section  business  communication  shall 
mean  any  transmission  or  communication  the  purpose 
of  which  is  to  facilitate  the  regular  business  or  com- 
mercial affairs  of  anj  party. 

[g  87.11  i  addtd  eff.  12-1-72;  VI  (72)-/  J 

§  97.1 15    Music  prohibited* 

The  transmission  of  music  by  an  amateur  station  Is 
forbidden. 

§97.116    Amateur    radioconimu meat  ion    for    unlawful 
purposes  prohibited* 

The  transmission  of  radiocommun  [cation  or  mes- 
sages by  an  amateur  radio  station  for  any  purpose,  or 
in  connection  with  any  activity,  which  i*  contrary  to 
Federal*  State,  or  local  law  is  prohibited, 

O  91419  «<ttf  &  eff*  12  1-12;  I7(72)~i] 

§97.117     Codes  and  ciphers  prohibited. 

Tbe  transmission  by  radio  of  messages  in  codes  or 
ciphers  in  domestic  and  international  communications 
t<>  nr  between  amateur  stations  is  prohibited.    All  com* 


DECEMBER  1973 


117 


munieations  regardless  of  type  of  emission  employed 
shall  be  in  plain  language  excopi  r  hat  generally  recog- 
nized abbreviations  established  by  regulation  or  custom 
and  linage  are  permissible  as  are  any  other  abbrevia- 
tions or  signals  where  the  intent  is  not  to  obscure  the 
meaning  but  only  to  facilitate  communications. 

§97.119    Obscenity,  indecency,  profanity. 

Xo  licensed  radio  operator  or  other  i>erson  shall 
trans tn it  communications  containing  obscene,  indecent, 
or  profane  words,  language,  or  meaning, 

§97.121     False  signals. 

No  licensed  radio  operator  .shall  transmit  false  or 
deceptive  signals  or  conn  mini  cat  ions  by  radio,  or  any 
call  letter  or  signal  which  has  not  been  assigned  by 
proi>cr  authority  to  thf  radio  station  be  is  operating; 

§97.123     Unidentified  communications. 

No  licensed  radio  operator  shall  transmit  unidenti- 
fied radio  communications  or  signals. 

§  9T. 1 25     Interference- 
No  licensed   radio   operator  shall   willfully   or  ma- 
liciously interfere  with  or  cause  Interference  to  any 
radio  communication  or  signal. 

597.127    Damage  to  apparatus. 

No  licensed  radio  ojierutor  shall  willfully  damage* 
or  cause  or  permit  to  be  damaged,  any  radio  apparatus 
or  installation  in  any  licensed  radio  station. 

§97.129    Fraudulent  licenses. 

No  licensed  radio  operator  i>r  other  person  shall 
obtain  or  attempt  to  obtain,  or  assist  another  to  obtain 
or  attempt  to  obtain,  an  operator  license  by  fraudu- 
lent means. 

Adm  in  istkative  Ka  NCTloNS 

§97431     Restricted   operation. 

(a)  If  the  operation  Of  an  amateur  station  causes 
general  interference  to  the  reception  of  transmissions 
from  stations  operating  in  the  domestic  broadcast 
service  when  receivers  of  good  engineering  design  in- 
cluding adequate  selectivity  characteristics  are  used 
to  receive  such  transmissions  and  this  fact  is  made 
known  to  the  amateur  station  licensee,  the  amateur 

station  shall  not  be  Operated  during  the  hours  from 
8  p.m.  to  10:30  p.m..  local  lime,  and  on  Sunday  for  the 
additional  period  from  10:30  a.m.  until  1  p.m.,  local 
time,  upon  the  frequency  or  frequencies  used  when  the 
interference  is  created, 

(b)  in  general,  such  steps  us  may  be  necessary  to 
minimize  interference  to  stations  operating  in  other 
services  may  be  required  after  invest jgation  by  the 
Commission. 

§97,133    Second  notice  of  same  violation. 

In  every  case  where  an  amateur  station  licensee  is 
cited  within  a  period  of  12  consecutive  months  for  the 
second  violation  of  the  provisions  of  SJOT.iil,  97,03, 
9T.(»r»,  !»7.71,  or  !»7.73,  the  station  licensee,  if  directed 
to  do  so  by  Ihe  Commission,  shall  not  operate  the  sta- 
tion ami  shall  not  permit  it  to  be  operated  from  6  p.m. 
to  10:90  p.liir,  local  time,  until  written  notice  has  been 
received  authorising  the  resumption  of  full-time  op- 
eration. TULs  notice  will  not  be  issued  until  the  11- 
eeii-M  i«  lms  reported  on  I  he  results  of  tests  which  he 
has  conducted  with  at  least  two  other  amateur  sla- 
loms at  hours  other  than  (i  p.m,  to  10:30  p.m.,  local 
time  >ueh  tests  are  to  be  made  for  the  specific  pur- 
|mst<  of  aiding  the  Herns**1  in  determining  whrHier  the 
emissions  +*f  the  station  are  in  accordance  with  the 
Commission's  rules.     Tin*  Licensee  shall  report  io  the 


Commission  the  observations  made  by  the  cooperating 
amateur  licensees  In  relation  to  the  reported  violations. 
This  rejiort  shall  include  a  statement  as  to  the  corn* 
tive   measures   taken   to  insure  compliance  with   the 
rule 

§  97*135    Third  notice  of  same  violation. 

In  every  ease  where  an  amateur  station  licensee 
Is  cited  within  a  i>ertod  of  12  consecutive  months  for 
the  third  violation  of  gjOT.Gi.  07.03,  07.05,  07.71,  or 
97,73,  the  station  licensee  if  directed  by  the  Commit 
sion,  shall  not  operate  the  station  and  shall  not  per- 
mit it  to  he  operated  from  S  a.tti,  to  12  midnight,  local 
time,  except  for  the  purposes  of  transmitting  a  pre- 
arranged test  to  he  observed  by  a  monitoring  station 
of  the  Commission  to  be  designated  in  each  particular 
case.  The  station  shall  not  ho  permitted  t<»  resume 
operation  during  these  hours  until  the  licensee  is  au- 
thorized by  the  Commission,  following  I  be  test,  to  re- 
sume full-time  operation.  The  results  of  the  teat 
and  the  licensee's  record  shall  be  c^n^idered  in  deter- 
mining the  advisability  of  suspending  Lhe  operator 
license  or  revoking  the  station  license,  or  both. 

§97,137    Answers  to  notices  of  violations. 

Any  licensee  receiving  official  notice  of  a  violation 
of  the  terms  of  the  Communications  Act  of  1034,  as 
amended,  any  legislative  act,  Executive  order,  treaty 
to  which  the  United  States  is  a  party,  or  the  rules  and 
regulations  of  the  Federal  Communications  Conainis- 
s:on,  shall,  within  10  days  from  such  receipt,  send  a 
written  answer  direct  to  the  office  of  the  Commission 
originating  the  ofJh  ial  notice:  Provided,  hoictver,  That 
if  an  answer  cannot  be  sent  or  an  acknowledgment 
made  wiiliin  such  10-day  period  by  reason  of  illness 
or  other  unavoidable  circumstances,  acknowledgment 
and  answer  shall  be  made  at  the  earliest  practicable 
date  with  a  satisfactory  explanation  of  the  delay.  The 
answer  to  each  notice  shall  be  complete  in  itself  and 
shall  not  be  abbreviated  by  reference  to  other  com- 
munications or  answers  to  other  notices.  If  the  notice 
relates  to  some  violation  that  may  he  due  to  the  physi- 
cal or  electrical  characteristics  of  transmitting  ap- 
paratus, the  answer  shall  state  fully  what  Steps,  if 
any,  are  taken  to  prevent  future  violations,  and  if  any 
new  apparatus  is  to  be  installed,  the  date  such  ap- 
paratus was  ordered,  the  name  Of  the  manufacturer, 
and  promised  date  of  delivery.  If  the  notice  of  viola- 
tion relates  to  some  lack  of  attention  or  improper  op- 
eration of  the  transmitter,  the  name  of  the  operator 
in  charge  shall  he  given* 


SUBPART  F— RADIO  AMATEUR  CIVIL 
EMERGENCY  SERVICE  (RACES) 

Central 

§37.161     Nature  of  this  service. 

(a)  The  Radio  Amateur  Civil  Emergency  Service 
provides  for  amateur  radio  operation  for  civil  defense 
communications  purposes  only,  during  periods  of  local, 
regioi.al  or  national  civil  emergencies,  including  any 
emergency  which  may  necessitate  invoking  of  the  Presi- 
dent's War  Emergency  Powers  under  the  provisions 
of  Section  (JOG  of  the  Communications  Act  of  1034,  as 
amended. 

<b)  I'ursunm  to  the  provisions  of  section  4(j|  of 
the  Communications  Act  of  1Q34.  as  amended,  records 
i  elating  Up  t^t*  Radio  Amateur  Civil  Emergency  £ervi< 

shall  not  be  open  to  general  public  inspection* 


l  18 


73  MAGAZINE 


§97.163     Definitions. 

For  flu-  purposes  of  this*  subpart,  the  following  defi- 
ttitions  are  applicable : 

(J i )  Ra dio  Amateur  C i v i I  Em erge n cy  Be r v i ce.  A 
rudfocormuftnication  service  carried  on  by  licensed 
amateur  rail  in  stations  while  operating  on  specifically 
ttosiguated  segments  of  the  regularly  allocated  amateur 
frequency  bands  under  the  direction  of  authorized 
local,  regional  or  federal  civil  defense  officials  pur* 
suant  to  an  approved  civil  defense  communications 
plan. 

(b)  Radio  Amateur  Civil  Emergency  Station.  An 
amateur  radio  station  which  is  authorised  to  operate 
in  the  Radio  Amateur  Civil  Emergency  Service  for 
the  purpose  of  transmitting  and  receiving  civil  defense? 

communications. 

i c )  Civil  defense  com m  un  ica  t  ion$m  Com m u n ica t ions 
or  signals  essential  to  the  conduct  of  civil  defense  ac- 
tivities of  duly  authorized  civil  defense  organizations, 
including  communications  directly  concerning  safety  of 
life,  preservation  of  property,  maintenance  of  law  and 
order;  alleviation  of  human  suffering  and  need  ami  dis- 
semination of  warnings  of  enemy  attack  to  the  civilian 
population  in  case  of  actual  or  impending  armed  at- 
tack or  in  any  disaster  or  other  incident  endangering 
the  public  welfare.  Such  communications  may  also 
include  transmissions  necessary  to  establishment  and 
maintenance  of  the  radio  system  and  communications 
essential  to  the  training  of  civil  defense  personnel 

(d)  Civil  defense  authority.  The  legally  appointed 
Director  of  Civil  Defense,  or  his  authorized  alternate 
or  representative,  for  the  particular  geographical  area 
(city,  county,  etc.)  whieh  a  proposed  radio  station  is 
intended  to  serve,  and  who  is  responsible  to  local  gov- 
ernmental authority  for  protection  and  aid  to  the  ci- 
vilian population  in  the  event  of  armed  attack  or  of 
any  disaster  or  other  incident  endangering  public 
safety. 

<e)  Civil  Defense  Communications  Officer.  The  of- 
ficial of  any  duly  constituted  civil  defense  organization 
having  direct  responsibility  under  the  Director  of  that 
organization  for  the  provision*  organization,  main- 
tenance, readiness,  and  utilization  of  all  means  of 
communication  to  be  used  by  such  civil  defense  or- 
ganization in  the  performance  of  its  lawful  functions. 

If)  Civil  Defense  Radio  Officer.  The  duly  desig- 
nated official  of  a  legally  constituted  civil  defense 
organization  who  is  directly  responsible  either  to  the 
Communications  Officer  or  to  the  Director  of  such  civil 
defense  organization  for  fhe  provision,  organization, 
maintenance,  readiness,  and  utilization  of  radio  com- 
munications facilities  for  civil  defense  use. 

(g)  tifulio  Amateur  Civil  Emergency  Network.  All 
radio  amateur  civil  emergency  stations  intended  to  be 
included  in  the  civil  defense  communications  plan  of 
the  area  concerned  and  which  operate,  or  are  to 
operate,  in  conjunction  with  a  single  control  station. 
Such  network  may  be  made  up  of  several  separately 
authorized  radio  amateur  civil  emergency  stations  or 
units  of  such  stations,  or  may  be  made  up  of  several 
units  of  the  same  station  operated  at  different  loca- 
tions. Id  addition,  the  same  radio  amateur  civil 
emergency  station  or  any  unit  of  such  Station  may  be 
a  part  of  more  than  one  network;  e-g.,  the  control  sta- 
tion of  one  network  may  also  be  the  control  station  or 
a  member  station  of  another  network  operated  in  con- 
junction therewith* 

§97,185     .Single  application    for  all   equipment  under 
one  amateur  station  license. 

tody  one  application  need  be  tiled  for  any  one  ama- 
teur station,  including  alt  transmitting  equipment  un- 


der the  control  of  the  lu-ensee  of  that  station,  even 
though  individual  units  of  such  station  are  capable 
of  being  operated  and  are  intended  to  be  operated 
independently  at  different  location-.  <»r  as  portable  or 
mobile  stations  with  do  ^xed  locations,  Xo  distinc- 
tion need  be  made  between  those  units  which  are  per- 
sonally owned  by  the  amateur  star  inn  licensee  and 
those  units  which  are  others  "No  under  his  technical 
control  for  opera  I  Ion  in  this  service 

§97J87    Issuance  of  station  authorization, 

An  authorization  to  operate  in  this  service  will  bo 
issued  in  the  discretion  of  the  Commission  npon  satis- 
factory completion  of  all  requirements  of  this  subpart 
and  proper  certification  that  the  requirements  of  the 
civil  defense  organization  for  which  the  station  will  be 
used  have  been  or  are  being  complied  with.  The  sta- 
tion authorization  (Form  4*1-3)  will  be  forwarded 
to  the  Civil  Defense  Radio  Officer  for  delivery  to  the 
applicant.  Such  authorization  will  be  accompanied  by 
a  stub  i  Form  Jsl-2&  which  may  lie  retained  by  the 
civil  defense  radio  officer  for  his  records. 

§97.189    Term  of  station  authorization. 

(a)  Authorization  to  operate  an  amateur  station 
in  the  Radio  Amateur  Civil  Emergency  Service  will 
be  issued  for  a  (onn  running  concurrently  with  the 
term  Of  the  amateur  radio  station  license*  Application 
for  renewal  of  such  authorization  shall  be  filed  con- 
currently with  application  for  renewal  of  the  basic 
amateur  radio  station  license, 

tb)  Whenever*  under  rules  contained  in  Subparts 
A  through  K  of  this  part,  modification  of  the  basic 
amateur  station  license  becomes  necessary,  if  such 
modification  affects  the  information  submitted  with 
the  original  application  for  authorisation  in  the  Radio 
Amateur  Civil  Emergency  Service,  application  for 
modification  of  the  Radio  Amateur  Civil  Emergency 
service  stall" ui  authorization  shall  be  submitted  con- 
currently therewith, 

(e)  Nothing  in  this  section  shall  lie  construed  to 
alter  the  Commission's  authority  to  cancel  or  amend 
a  station  authorization  in  the  Radio  Amateur  Civil 
Emergency  Service  in  accordance  with  the  applicant's 
agreement  as  indicated  on  the  initial  application  for 
station  authorisation, 

§97.191     Cancellation  of  station  authorization. 

(a)  Hack  authorization  for  operation  in  the  Radio 
Amateur  Civil  Emergency  Service  shall  be  issued  with 
the  express  provision  that  such  authorization  is  sub- 
ject to  revocation  or  cancellation  Without  hearing 
whenever,  in  the  opinion  of  the  Commission,  the 
security  of  the  United  States  or  the  proper  functioning 
of  the  Radio  Amateur  Civil  Emergency  Service  would 
be  served  thereby. 

(b)  The  station  authorization  shall  be  submitted  to 
the  Commission  (via  the  Civil  Defense  Radio  Officer) 
for  cancellation  under  the  following  circumstances: 

(1)  The  station  for  which  the  authorization  was  is- 
sued becomes  inactive  for  a  period  of  three  mouths 
or  it  is  not  planned  to  use.  the  station  in  the  radio  ama- 
teur civil  emergency  network  for  a  period  of  at  least 
three  months. 

(2)  The  basic  amateur  radio  Station  license  of  the 

Station  has  expired  and  has  not  been  renewed. 

(3)  In  cases  where  the  amateur  radio  station  li- 
cense and  the  radio  amateur  civil  emergency  slat  inn 
authorization  have  both  been  modified,  the  original 
authorization  of  the  latter  shall  be  submitted  lo  the 
Commission  Immediately  upon  receipt  by  tin*  licensee 
of  a  new  or  modi  lied  authorization, 

(To  be  continued  next  month) 


DECEMBER  1973 


1  19 


CIRCUITS,  CIRCUITS,  CIRCUITS. 

The  following  circuits  have  appeared  in  the  referenced  books,  magazines,  application  notes*  etc* 
While  iv e  try  to  reproduce  all  of  the  information  that  should  he  needed  by  an  experienced  constructor, 
readers  may  want  to  avail  themselves  of  the  original  sources  for  peace  of  mind. 

Readers  are  reQuested  to  pass  along  any  interesting  circuits  that  they  discover  in  sources  other  than 
U.S.  ham  magazines.  Circuits  should  be  oriented  toward  amateur  radio  and  experimentation  rather 
than  industrial  or  computer  technology.  Submit  circuit  with  all  parts  values  on  it,  a  very  brief 
explanation  of  the  circuit  and  any  additional  parts  information  required,  give  the  source  and  a  note  of 
permission  to  reprint  from  the  copyright  holder,  if  any,  and  the  reward  for  a  published  circuit  will  be  a 
choice  of  a  73  hook.  Send  your  circuits  to  73  Circuits  Page,  73  Magazine,  Peterborough  NH  03458. 


WOOES  RATED 
AT  100  mA  EACH 


AUCMO       £5' 
FROm 
DET 


1001 


IN54 


Shunt  diode  noise  limiter  for  use  across  a  loud- 
speaker. 


-BIAS 


Half-wave  series  noise  limiter  with  adjustable  clip 

ping  level , 


^~t — T  -L    oux*° 


1N56 


IN56 


DET 


Shunt  diode  noise  limiter  that  can  be  easily  added 
to  the  input  of  an  audio  amplifier  . 


Full- wave  series  noise  limiter  , 


W  XFMR 


OB+ 


One   of  the   best  noise   limiters  is   the    i4rate-of- 
change"  limiter  designed  for  TV  audio  in  England. 


This  simple  noise  limiter  is  installed  in  an  i-f  stage 
for  SSB  and  CW  use.  The  diode  must  have  high 
back  resistance,  low  capacitance  and  short  rise 
time. 


This  "trough"  limiter  will  eliminate  the  back- 
ground noise  that  is  ignored  by  conventional 
limiters. 


IF  AM= 


© 


.001 


4TOI 


r 


IF  XFMfi 


HhHH 

J  J 


I* 


B+ 


This  is  an  improved  version  of  the  SSB  i-f  noise 
limiter    above* 


120 


73  MAGAZINE 


OWN   YOUR  OWN 

ELECTRONIC   WAREHOUSE 

Minimum  investment:  $10.00.  This  is  not  a  franchise. 


PLASTIC 
VACS 


You  can  have  parts  running  out  of 
your  ears!  Here  are  rafts  of  bags,  each 
containing  an  assortment  of  specific 
parts.  They're  fantabulous! 


*#**••»# 


100  CM-20  MICA  CONDENSERS.  Mixed  values.  . . . 
100  %W.  5%  CARBON  RESISTORS.  Mixed  values.  . 
100  CM-30  MICA  CONDENSERS.  Mixed  values.  . . . 
100  DIODES  (Silicon/Germanium).  Mixed  types/sizes. 

50  SLI DE  SWITCHES.  A  super  assortment 

50  CONDENSERS  (Paper  and  Mylar).  Assorted  values. 

20  VOLUME  CONTROLS.  A  volume  value!  Assorted 

V%  LB.  HARDWARE.  Nuts,  bolts,  screws,  etc 

20  TANTALUM   CONDENSERS.    1  SOD  type.  Assorted. 

100  PRECISION  RESISTORS.  Mixed.  Mostly  film 

50SOCK-IT-T0-'EM  TUBE  SOCKETS.  Assorted.  .  . . 
100  CERAMIC  DISC  CONDENSERS.  Lots  of  types.  . . . 

100  RUBBER  GROMMETS.  Many  popular  sizes 

100  CABLE  CLAMPS.  Nylon.  Assorted 

100  ADEL  TYPE  RUBBER  CABLE  CLAMPS.  Assorted. 
20  ROTARY  SWITCHES.  Ceramic  and  Phenolic.  Ass'td. 

TERMS:  Minimum  order  $10.00.  If  less  than  that,  add  $1.00  service  charge. 


m        m 


.  $5.00 
.$1.00 
.  $7.00 
.  $2.00 
.  $3.50 
.  $3.50 
.  $2.00 
$1.00 
.  $3.00 
$15.00 
.$3.50 
.  $2.50 
.  $2.00 
.  $3.00 
.  $3.00 
.  $3.00 


R-108/GRC  FM  15  &  10 
METER    RECEIVER    One 

of  the  Army's  latest  com- 
munications receivers!  Co- 
vers 20—29  mc  in  one  ba- 
nd. Receives  AM  with  min- 
or modification.  Has  3  pre- 
set channels,  easily  chang- 
ed from  front  panel.  (No 
crystals).  Makes  great  mon- 
itoring receiver,  satellite  or  CB  band.  Comes  with 
modification  and  AC  power  supply  instructions. 

New  or  like  new.  Special  at $19.95. 

AC  POWER  SUPPLY  KIT  for  above $12.95. 


190-550KC  Q-5er.  Good  Condition  Recvr  .  .  $14.95 
or  like  new  recvr $19.95 

6-9MC  40  Meters  Good  Condition  Recvr  ....  $9.95 

2.1 3MC  T  18/ARC-5  (Mew  Xmtr $4.95 

4-5.3MC  T-20/ARC-5  Excl.  Condition  Xmtr.    $3.95 


4-5.3MC  BC-475  New  Xmtr 


$5.95 


MD-7/ARC-5    Plate    Modulator    for   Above   Xmtrs. 
Exl.  Condition    $4.95 


Columbia  Electronic  Sales,  Inc. 

P.O.  Box  9266,  7360  Atoll  Ave.,  North  Hollywood  CA  91609  Tel  (213)  875-2970  &  764-9030 


DECEMBER  1973 


121 


petuvn 

RUS  ELECTRONICS 


1101  256-bit  static  RAM $2.25 

5260  1000-bit  dynamic  RAM $8.00 

MM531 1  4  or  6  digit  clock,  12  or  24  hour. 

7-segment  and  BCD  output . . .  $9.00 
MM5314  same  as  above,  without  BCD 

output $7.50 

MM5316  4  digit  alarm  clock  chip  . .  $15.00 
CT5001   12  digit  4  function,  fixed  decimal, 

0,  2,  3,  &  4  positions $7.50 

CT5002  low-voltage  version  of  above  $8.50 
CT5005  12  digit  4  function,  0-5  decimal 

places,  +  and -memory $10.00 


POWER  SUPPLY  KIT   PS  5    1 

5  volt  1  amp  power  supply  kit  with 
printed  circuit  board  and  instructions. 
Transformer  has  internal  r.f.  shieid.SlO.OO 


LEDS   Application  note  included. 

LED  1  OR  -  Pack  of  10  discrete  red  lens 
LEDs,  various  MV5020-series  types. $1.50 

LED  10C  —  Pack  of  10  discrete  clear  lens 
LEDs,  various  MV5020-series  types. $1.50 


7 -SEGMENT  DISPLAYS 

MAN  3  —  common  cathode,  .1 25  in.  high 

$2.00    4forS6.00 
MAN  4  —  common  cathode,  .2  in.  high. 

$2.75    4  for  $8.00 

We  also  have  green,  yellow  and  amber  discrete 
LEDs.  Write  for  our  flyer  for  details. 


WIRE  WRAP  SOCKETS 


14  pin 
16  pin 
24  pin 
28  pin 
40  pin 


■   •««•* 


$  .50 
.  .60 
.  1.25 
.  1.35 
.  1.80 


TRANSISTORS 

NPN    and    PNP   TO-18   general    purpose 
silicon  transistors.  $0.15  ea. 

10  or  more,  $0.10  ea. 

Excellent  for  use  with  the  clock  chips. 

2N2222  (NPN)  TO-18  $0.25  ea. 

10  or  more,  $0.20  ea. 
2N2907  (PNP)TO-18  $0.25  ea. 

10  or  more,  $0.20  ea. 

Mil.  spec,  rejects;  meet  commercial  specs. 


UNTESTED  DTL 

All  marked  units,  dual  in-line  packages 

20/S1.00 


JUNCTION  FETS  TO -18  CASE 


N-CHANNEL: 
NO. 


I 


DSS  (ma) 


V, 


PRICE 


mm  max     mm  max 


NJF10 

1 

25 

.7 

9 

NJF11 

5 

170 

.5 

10 

NJF12 

.1 

10 

.5 

8 

NJF13 

.02 

1 

.5 

6 

NJF14 

.  *J 

17 

.5 

8 

3/$1.00 
4/S1.00 
4/S1.00 
3/S1.00 
4/S1.00 


4/$1.00 
4/$1.00 


P-CHANIMEL: 

PJF11       5      90 
PJF14      .3      20 

Notes: 

NJFlOis  usable  to  450  MHz; 

NJF11    and    PJF11     are    complements, 

high-current  and  good  to  100  MHz; 

NJF12  is  general  purpose; 

NJF13  is  a  low-current  high -impedance 

type; 

NJF14  and   PJF   14  are  complements, 

general  purpose  and  good  to  50  MHz. 


RGS  ELECTRONICS    (408)   247-0158 
3650  Charles  St.,  Suite  K,  Santa  Clara,  CA  95050 


We  sell  many  ICs  and  components  not  listed  in  this  ad,  including  most  7400s  and 
linears.  Send  a  stamp  for  our  free  flyer.  TERMS  OF  SALE:  All  orders  prepaid;  we 
pay  postage.  $1.00  handling  charge  on  orders  under  $10.00.  California  residents 

add  5%  sales  tax.     Please  include  name,  address  and  ZIP  code  on  all  orders  and  flyer  requests. 


122 


73  MAGAZINE 


JHtrry  (EljriatmaB 


Wtf 


ear 


&Mti&1&& 


A  beautiful  KENWOOD  PAIR  - 
The  R599  &  T599.  These  units  are 
used,  but  you  couldn't  tell! 
Excellent  condition. .  .  $595.95  f.o.b. 

The  NEW  TEN  TEC  TRITON  II  is 
only  $606.  This  is  a  rig  you  have  to 
see    to    appreciate.    AN   solid   state, 

with  economy  plus.  AC 
Model  252  is  $89  and  the 
Filter  for  CW  enthusiasts  is 
$19.  By  the  way,  the  TRITON  II 
also  sports  FULL  CW  break  in. 


small, 

Supply 
150Hz 


IC  230   $489.00 

TR  22  (only  3  left) $185.00 

LINEAR  SYSTEMS  SB450 
Transverter $189.00 

B  &  W  334  1  KW  Dummy  Load  and 
Wattmeter   DC-300   MHz 
just  $139.95  postpaid. 


If  you  are  looking  for  a  fine 
receiver,  check  out  the  TEN  TEC 
315  for  just  $229  The  CW  Filter 
$14.95 

Speaking    of    receivers,    look    at 
these  GREAT  BARRY  BUYS.  . . 
SX  122  (mint  condition)        $349.00 
HQ  180  (mint  condition)       $225.00 


Other  Great  Christmas  Buys.  . 
COLLINS  31 2B4  (used)  ...$149.00 

COLLINSPhonePatch152J1  $29.95 

$289.00 


IC22   . 


LITTLE  LULU  6  meter  xcvr  w/AC  & 
DC  supply  built-in.  Full  VFO  coverage 

50  -  54.  Factory  wired $65.00 

For  builders  we  can  supply  all  parts 
for  "doing  it  yourself" $41.00 

HAM  M  ROTORS $99.95 

ROTOR  CABLE 14rf  a  foot. 

100  ft.  RG8AU  (PL259  on  one  end 
-  TYPE  N,  the  other  end  . .  .  $12.50 

2     METER     MAGNETIC     MOUNT 
MOBILE  ANT.    (reg.  $25.00) 
now  just  $9.95 

(with  10  ft.  RG  &  PL  259  add  $1.50  for  postage) 

SR160  New  with  AC  Supply  $350.00 

REMEMBER!  Barry  has  the  Greatest  Diversified 
Stock  of  Tubes  in  the  country. 
EIMAC,  WESTINGHOUSE,  etc. 

4CX-1000A  $1 10.00  -  3-500Z  $37.00  plus 
any  tube  you  need  and  chimneys  too. 


BAB\R\Y 

_  L_ 


_  LJ  \~j 


r\ 


n 


u 


n 


b 


(Areo  Code:  212)  WAIker  5-7000 

CORPORATION 


512  BROADWAY,  NEW  YORK,  NEW  YORK  -  10012 


DECEMBER  1973 


123 


has  one 


never 

company 


such  a 

selection  of  superb 
amateur  equipment 


KENWOOD  TS-520 

The  new  TS-520  ts  the  transceiver  you 
have  wanted,  but  could  not  buy  until 
now.  it  is  a  no-compromise,  do 
everything,  go  everywhere  5  band 
transceiver  for  SSB  or  CW  that 
performs  equally  welt  at  home,  in  an 
automobile,  airplane,  boat  or  trailer. 
The  TS-520  features  built-in  AC 
power  supply,  built-in  12  volt  DC 
power  supply,  built-in  VOX  with 
adjustable  gain  delay  and  antt-VOX  . 

PLUS    A     HOST     OF     OTHER 
IMPORTANT     FEATURES     AND 
PROVEN  Kenwood  reliability.  All  at  a 
price  most  amateurs  can  afford. 
The  price     .  $-599 ,00 


HENRY  2K-ULTRA 

There  has  never  been  an  amateur 
linear  amplifier  like  the  new  2K- 
ULTRA.  Small  and  lightweight,  yet 
rugged  and  reliable  alt  that  the 

name  implies.  The  ULTRA  loafs  along 
at  full  legal  power  without  even  the 
sound  of  a  blower.  Its  anode  heat  is 
silently  and  efficiently  conducted  to  a 
heat  sink  through  the  use  of  a  pair  of 
Brnac  8873  tubes,  In  fact  all  of  its 
components  are  the  very  best 
obtainable.  The  price  , , ,  $845.00. 


124 


m  •  « 

: 

IE 


KENWOOD  TS-900 

.  .  .  the  ultimate  tranceiver,  The 
promise  of  the  transistor  has  been 
fulfilled.  Here  is  the  transceiver  you 
will  want  to  own  ,  ,  ,  whatever  you 
have  now,  get  ready  to  trade  up.  Its 
important  features  are  far  too 
numerous  to  list,  its  specifications  are 
superb.  The  TS-900  is  unquestionably 
the  best  transceiver  of  its  kind  ever 
offered.  The  price  , . .  $795,00 


'«*!■ 


HENRY 
2K-4 


The  2K-4  linear  amplifier  offers 
engineering,  construction  and 
features  second  to  none,  and  at  a 
price  that  makes  it  the  best  amplifier 
value  ever  offered  to  the  amateur. 
Constructed  with  a  ruggedness 
guaranteed  to  provide  a  long  life  of 
reliable  service,  its  heavy  duty 
components  allow  it  to  loaf  along 
even  at  full  legal  power.  If  you  want  to 
put  that  strong  clear  signal  on  the  air 
that  you've  probably  heard  from  other 
2K  users,  now  is  the  time.  Move  up  to 
the  2K-4,  Floor  console  , .  .$845  00. 


KENWOOD  R-599A 

The    R-599A  is   the    most    complete 
receiver  ever  offered-  It  is  solid  state. 

superbly  reliable,  small  and  light* 
weight,  covers  the  full  amateur  band  , 
. .  10  thru  160  meters,  CW,  LSBT  USB, 
AM,  AM.N  and  FM.  Features 
selectable  AGC  (slow  or  fast),  built-in 
calibrator,  monitors  T-599A 
frequency  to  calibrate  transmitter, 
squelch  circuit.  1  KHz  frequency 
readout,  versatile  cross  channel 
operation  with  the  T-599A,  stable  and 
accurate  VFO,  and  many;  many  more 
In  fact,  the  R-599A  is  loaded  with 
features. .  .  many  that  are  "optional  at 
extra  cost"  in  other  receivers,  T^e 
price  . . .  $439.00 

. . .  a  winning 


KENWOOD  T-599A 

The  T-599A  is  mostly  solid  state  .  .  . 
only  3  tubes,  has  built-in  power 
supply,  full  metering  (ALC,  Ip,  RF 
output  &  high  voltage),  CW-LSB-USB- 
AM  operation,  1  KHz  frequency 
readout,  smooth  easy  VFO  action, 
buiJt-in  VOX  (with  delay,  sensitivity 
and  anti-VOX  adjustments),  built-in 
semi-automatic  CW  with  sidetone*  full 
amateur  band  coverage  10  thru  80, 
versatile  cross  channel  operation  with 
the  R-599A.  The  price  . . ,  $459.00 

73  MAGAZINE 


ONLY  HENRY  RADIO  OFFERS  SUCH  A  BROAD 
LINE  OF  TRULY  OUTSTANDING    EQUIPMENT. 

EVERY  UNIT  REPRESENTS  THE  MOST  ADVANCED 
TECHNOLOGY ...  THE  ULTIMATE  IN  VALUE  FOR 
YOUR  INVESTMENT. 


u»*«* 


b  -T"* 


TEMPO/ 2001 

Small,  but  powerful  and  reliable  .  .  . 
the  2001  linear  amplifier  offers  a  full 
kilowatt  of  power  for  SSB  operation  in 
an  unbelievably  compact  package.  It 
uses  two  Bmac  8874  grounded  grid 
triodes  ,  ,  .  has  a  built-in  solid  state 
power  supply,  built-in  internal  blower 
a  relative  RF  power  indicator,  full 
amateur  band  coverage  from  80-10 
meters  and  is  completely  wired  and 
ready  for  operation.  The  price  -  ,  - 
S545.00 


TEMPO/ 6N2 

The  Tempo  6N2  amplifier  combines 
most  of  the  fine  features  of  the  2001 
for  6  and  2  meter  amateur  operation. 
The  amplifier  uses  the  same  small 
cabinet,  the  same  modern  tubes,  the 
same  inherent  quality  for  2000  watts 
PEP  input  on  SSB  or  1000  watts  input 
on  FM  or  CW.  The  rig  is  completely 
wired  in  one  small  package  with  an 
internal  solid-state  power  supply, 
built-in  blower,  and  RF  relative  power 
indicator.  The  price  . . .  $695.00. 


Attention  Military  &  Commercial  Users 
Henry  Radio  offers  a  broad  line  of 
exceptionally  reliable  high  power 
linear  amplifiers  and  PGB  industrial 
power  generators 

HENRY,  KENWOOD  and  TEMPO 
amateur  products  are  available  from 
dealers  throughout  the  U.S. 

Export  inquiries  Invited 


TEMPO /ONE 

. .  .  the  best  value  in  SSB  transceivers 
on  the  market  today.  Look  at  the 
specifications  .  .  ,  look  at  the  price  tag 
, . .  ask  any  of  the  thousands  of  Tempo 
ONE  owners  about  its  reliability,  and 
the  reason  for  its  unparalled 
popularity  will  be  obvious-  Features 
solid  state  VFO,  receiver  offset  tuning 
(clarifier),  all  amateur  bands  80  thru 
10  meters,  SSB  upper  and  lower 
sideband,  CW  and  AM,  The  price  .  .  , 
$349.00 


TEMPO/ CI- 146 

The  CL-146  offers  operation  on  the 
146  MHz  amateur  band,  The  price 
includes  a  microphone,  power  cord, 
mounting  bracket  and  one  pair  of 
crystals,  A  full  line  of  accessories  is 
also  available. 

•  12  channel  capability  •  13  watts  or  a 
power  saving  3  watts  •  All  solid  state, 
12  VDC  -  144  to  148  MHz  (any  two 
MHz  without  retuning)  •  Supplied 
with  one  pair  of  crystals  •  RF  output 
meter.  S-meter,  receiver  detector 
meter  ■  Provisions  for  external 
oscillator  •  Monitor  feature  *  Audio 
output  at  front  panel  *  Internal 
speaker*  The  price:  $299,00. 


TEMPO/ FMH 

So  much  for  so  little! 

2  watt  VHF/FM  hand 
held.  6  Channel 
capability,  solid  state, 
12  VDC,  144-148  MHz 
(any  two  MHz), 
includes  1  pair  of 
crystals ,  built-in 
charging  terminals 
for  ni-cad  cells,  S- 
meter,  battery  level 
meter,  telescoping 
whip  antenna, 
internal  speaker  & 
microphone.  S199.00, 


VHF  AMPLIFIERS 

Tempo  is  exclusive  distributor  for  a 
full  line  of  superb  quality  soNd  state  2 
meter,  amateur  VHF  FM  amplifiers 
designed  for  mobile  or  base  station 
operation.  Output  ranges  from  25  to 
130  watts  for  drive  power  of  1  to  25 
watts.  Commercial,  type-accepted 
amplifiers  are  available  also.  Please 
write  for  prices  and  specifications. 

TEMPO/ CL-220 

As  new  as  tomorrow!  The  superb  CL- 
220  embodies  the  same  general 
specifications  as  the  CL-146,  but 
operates  in  the  frequency  range  of 
220-225  MHz  {any  three  MHz  without 
retuning).  At  $329,00  it  is  undoubtedly 
the  best  value  available  today. 


11240  W.  Olympic  Blvd.,  Los  Angeles,  Calif.  90064 
931  N.  Euclid,  Anaheim,  Calif.  92801 
Butler,  Missouri  64730 


213/477-6701 

714/772-9200 
816/679-3127 


DECEMBER  1973 


Prices  subject  to  change  without  notice. 

125 


INDUSTRI  ES 

NC. 


* 


W 


INDUSTRIES 
INC. 


Dealers!  Write  for  our  special 
Distribution  Price  Program. 

Post  Office  Box  508 
919  Eighth  Street 
Prague,  Oklahoma  74864 


crystals^***  «, 

±  .0025%  quaranteed  tolerance 

VOVUJLrfK 


PHONE    (405>  567-2286 


Please  rush  the  following  crystals  to: 
MO.  or  check  enclosed  for  full  amount. 
For  postage  and  handling  add  1  —5  crystals 
25d;  6—10  45d.  CITY 


NAME.  ,  . 
ADDRESS 


•  *  * 


«      •«■**!*      •*•*•«•      ■       f      *      •      • 


STATE ZIP 


Quantity 

Channel 

MHz 

Crystal 
Freq. 

Equip. 
Make  and  Model 

— 

master  c»*Ulrg* 


M.C*  Account  Number 


USE  YOUR  CREDIT  CARD! 

$10.00  Minimum  billing  on  credit  cards 
BankAmericard  or  Master  Charge  only, 

B.A.  Account  Number 


BankAmekicaho 


*■*-  ***■ 


Signature  . 


I  hereby  authorize  this  purchase  to 
be  charged  to  my  account  as  indicated 

Date 


My  card  expires  on 


BILL  GODBOUT  ELECTRONICS 
BOX  2673,  OAKLAND  AIRPORT,  CA  94614 

LED  7  segment  similar  to  DL  704  pins  same  as  MAN  4,  .3  char 
$2.75  ea  10/$22.50 

7  SEGMENT  assembly  3  in  1  dip  pac  sim  to  MAN  33.  Ideal  for  calculators.  8 
digits  and  minus  -sign . . $7.95 

1 1  digits  and  minus  sign $10.50 

7  SEGMENT  readouts  2  in  1  pac  plus  space.  Ideal  for  clocks.  6  digits  for $5.95 

CLOCKS  shipped  with  prints  #5314 $9.50 

#5316  alarm  clock  $13.50 

CALCULATORS  shipped  with  prints  5001  basic  4  function   $6.95 

5002  4  function/low  power  drain $7.95 

005  4  function  with  memory  register $9.95 

AA  StZE  NI-CADS  while  they  last 64c  10/5.95 

Low  noise  dual  FETs.  Ideal  for  stereo  preamp  sim  to  2N54B4 2/1.00 

RF  FETS  sim  to  2N4416 2/1.00 

RF  dual  FETS $1.00 

2N2907 5/$1.00 

2N2222 5/$1.00 

FET  plug  in  replacement  for  6AK5.  Good  for  IF's  etc  1 0SS  6-1 0-ma  $3.95  10/35.00 


ICs,  most  TTL  & 

LINEAR  in 

stoc 

CMOS 

DIGITAL 

74C00 

70 

CD4001 

.70 

74C02 

.70 

CD4002 

.70 

74C04 

.95 

CD4009 

1.00 

74C10 

.70 

CD4010 

1.00 

74C20 

.70 

CD4011 

.70 

74C73 

1.65 

CD4012 

.70 

74C74 

1.50 

CD4013 

1.50 

74C76 

1.65 

CD4016 

1.50 

74C107 

1.65 

CD4019 

1.40 

74C151 

3.00 

CD4023 

.70 

74C160 

3.25 

CD4025 

.70 

74C161 

3.25 

CD4035 

3.00 

74C162 

3.25 

74C163 

%J .  J—  iJ 

74C195 

3.50 

LINEAR 

LM370 

1.25 

LM371 

1.25   Replaces  HEP  590 

LM372 

1.25 

LM374 

2.00 

LM380 

1.75 

741 T 

.45 

CA  3028 

.75 

CA3065 

.75 

CA  3086 

45 

Buy  10  ICs - 
Buy  100  ICs  - 
All  ICs  tested 


10%  discount 
-  20%  discount 
and  guaranteed 


LINEAR  VOLT  AGE  R 

LM  309K  5V  1 A  REG 

LM  320K  NEG  Reg  available  in  5V  12V  &  15V 
LM  340K  POS  Reg  available  in  6V  12V  &  15V 
LM  723  Adjustable  precision  reg 


m    m     ■     » 


o  nn 

2.25 

2.25 

1  00 

■      »■■■„»        I   +KJKS 


TRANSISTOR  GRAB  BAG  mixed  NPN  PNP  100  for   2.95 

ALL  ITEMS  IN  STOCK  and  will  be  shipped  within  24  hours  of  receipt  of  order! 

Include  504  postage  and  handling  on  orders  under  $10.00,  all  others  postpaid. 
Sorry,  NO  C.O.D:  's.   CALIFORNIA  RESIDENTS  ADD  6%  sales  tax. 


DECEMBER  1973 


127 


MRXM 


WU.*1I    WMtL 


*feu  11  iffli        art 


Down  to  $429,95.  .  .The  FM-27B  Transceiver 
During  Clegg's  1 -Month  Factory  Authorized  Holiday  Sale! 


CHECK  THESE  SPECIFICATIONS 

GENERAL 
POWER  REQUIREMENTS:  12  to  14  VDC 

Current  Consumption  at  13.5  VDC: 

Receive:  4  amps  squelched,  1.2  amps  unsquelchecL 

Transmit :  6  amps  max, 
DIMENSIONS:  7  3/8"  x  3  1/2"  x  9  1/4"  deep;  4  lbs. 

net  weight. 

RECEIVER 

TUNING  RANGE:  146.00  to  148.00  MHz,  continu- 
ously tuneable  with  reset  capability  of  appro*. 
1    KHz  to  any  frequency  in  range. 

SENSITIVITY  i  .35  ^v  max.  for  20  db  quieting;  ,1  jxv 
for  reliable  squelch  action. 

SELECTIVITY:  1 1  KHz  at  3  db;  Less  than  30  KHz  at 
70  db.  Adjacent  (30  KHz  spaced)  channel  rejection 
more  than  70  db. 

AUDIO  OUTPUT:  2.0  wans  (minj  at  less  than  10% 
THD  into  internal  or  external  ohm  speaker, 

TRANSMITTER 
TUNING      RANGE     AND     CONTROLS:     Same     as 

RECEIVER,   ■ 
POWER  OUTPUT:  25  watts  Min.  into  50  ohm  load. 

P/A  transistor  protected  for  infinite  VSWR. 
MODULATION:   Internally  adjustable  up  to  10  KHz 

deviation  and  up  to  1 2  db  peak  clipping. 


During  December  only,  you  can  save 
$50.00  on  the  purchase  of  THE  2-meter 
rig,  the  Clegg  FM-27B.  The  only  2-meter 
transceiver  with  any  combination  of  trans- 
mit  or  receive  frequency  from  146  to  148 
MHz,  the  FM-27B  needs  NO  ADDITIONAL 
CRYSTALS.  It  gives  you  built-in  total 
coverage,  reliability,  and  dependable  per- 
formance. Take  advantage  of  this  one* 
month  factory  authorized  special  and  start 
1974  with  Clegg's  2-meter  leader.  Act  today. 
Call  us  now  so  we  can  wish  you  a  happy 
holiday  or  give  you  more  information. 

MERRY  w^ 
CHRISTMAS 


AMATEUR-WHOLESALE  ELECTRONICS 


master  charge 

THE  INTERBANK  CARD 


8817  S.W.  129  Terrace-Miami,  FL  33156 

Telephone  -  day*  (306)  233-3631  -  nights  and  weekends  -  (305)  666-1347 

NO  ONE  ANYWHERE  BEATS  OUR  DEAL! 


BankAmericard 


mStftm  ^sts 


MOTOROLA 


METRUM 


2M  FM  Transceiver 


MOTOROLA  -  Big  name,  but  now  priced  for  the  Ham.  The  Metrum  II  features  high 
Quality  and  High  Performance  in  the  Motorola  Tradition*  The  Metrum  II  has  12 
Channel  capability  (146,94MHz  supplied)  And  requires  only  one  crystal  per 
channel.  Repeater  operation  is  accomplished  by  installing  an  optional  Repeater 
Offset  crystal.  In  Repeat  mode,  the  transmitter  frequency  is  shifted, 

Receiver  specs  are  on  par  with  their  commercial  models;  Guaranteed:  .35uv-20db 
quieting  (.25uv  sinad),  Intermod  —  70db,  Spurious  and  Image  rejection  —  65db. 
Very  sensitive!  —  But  provides  "Garbage-free"  reception  in  metro  areas  where 
some  rigs  are  "Wiped  out"  by  adjacent  channel  interference  and  intermod. 

Available  in  two  models  —  I  0  or  25  watts  output*  Both  have  hi/lo  power  switch 
to  reduce  output  to  one  watt.  Other  features  include  back-lighted  control  panel, 
polarity  and  antenna  mismatch  protection  and  5  watts  of  audio  power,  Microphone 
and  mobile  mount  included.  Ready  to  go  on  I2vdc.    2lA"  h,  9!4"  d,  I  I"  w. 

Amateur  Electronic  Supply  has  been  selected  to  distribute  this  fine  new  product. 
Write  or  phone  today  for  more  info  —  Trades  —  Financing  —  etc. 

INTRODUCTORY  OFFER:  If  you  purchase  a  new  Motorola  Metrum  II  FM  rig  at 
the  Regular  price  and  without  a  trade-in,  you  may  take  a  $50,00  "Bonus  Credit*' 
toward  the  purchase  of  other  merchandise  (such  as  xtalsp  antennas,  supplies,  etc.) 


Iranch  Stores  in: 

ORLANDO,  FLORIDA 

& 

CLEVELAND,  OHIO 


master  charge 

TH£  INTERBANK  CARD 


METRUM   II    10  watt  model. 
METRUM   II    25  watt  model. 


.$399.95 
.    499.95 


Crystals  (one  per  channel)  .... 
600  kHz  Repeater  Offset  Crystal 
AC  Power  Supply 


9.00 

13.50 

150.00 


I 


k 


I 


•    ■ 


4828  West  Fond  du  Lac  Ave.    Milwaukee,  Wis.  53216 

Phone  (414)  442-4200 

STORE  HOURS:  Mon  &  Fri   9-9.    Tues.  Wed  &  Thurs  9-5:30:    Sat  9-3 


FREQUENCY  SYNTHESIZERS  **?&*- 


YOU'LL  NEVER 

HAVE  TO  BUY 

CRYSTALS 

AGAIN! 


.  * 


off^w^1 


•&GSB&BD&&i 


f    4    6      9 


FREQUENCV    SVNTHESlZCH 


MODEL;  ST-140 

Price:    $129-95  ppd. 

Tested,  guaranteed  and 
complete  with  mobile 
mounting  bracket,  tilt 
stand  and  transmitter 
matching  kit. 

NOTE:  NY  State  residents 
add  sales  tax. 


CHECK  THE  ADVANTAGES  OF  A  VANGUARD  SYNTHESIZER  OVER  OTHER  BRANDS- 


•+ 


•  No  microphonics  Can  b*  u^d  mobile  over  bumpy  roach. 

•  Reference  frequency  and  tpwrioui  output  down  70  dB-  (excluding 
harmonics  of  output  frequency  which  ire  used  in  the  transmit!** 
anyway.) 

•  AH  output  frequencies  are  generated  directly  from  me  VCO  without  the 

use  of  mu  I  tip  Hers  and  are  therefore  free  of  sub*  harmonics. 

•  Now    available    with    outputs   in    the   6,    Bp    12    and    18    MHz.    bandi 

(corresponding  to  144  MHz.  dial  reading)  for  direct  substitution  of 
transmitting  crystal}.  More  output  frequencies  an  being  made  available. 
Call  us  «f  you  don't  see  what  you  need. 

•  Entire  frequency  appears  in  line  in  clear  digits.  No  guesswork  or  mental 

additions.  Thumbwheel  switches  provide  fast,  accurate  selection  of  1000 
channels  in  tQ  KHr  steps  from  14000  to  149.99  MH/ 
■  50  ohm  output  and  impedance  transformer  kit  at  lows  use  at  any  distance 
from  trammtiter. 


Mamtami  an  accuracy  of  0005%  (5  pans  per  million)  over  the  entire  rj 
of  1<T  to  *-60*  C  with  a  precision  temperature  compensated  crystal  that 
requires  no  oven.  Operates  at  5  MHt,  for  easy  checking  w*th  WWV  and 
includes  a  zero  trimmer  for  correcting  long  term  aging  drift, 
Fast  response  time  of  only  3  milliseconds  for  a  10  KHz.  step  change  in 
frequency  and  a  remote  control,  gated  output  amplifier  for  push  to  talk 
operation, 
No  hunting  or  false  locks  as  with  some  other  synthesizer*. 

Operates   from    10   to    15   VDC    3  precision   regulators  eliminate  input 

voltage  fluctuations.  Can  also  be  used  on  110  volts  AC  with  a  small  12 

volt  1/2  amp  power  supply 
Smallest  size  of  any  commercial  synthesizer.   Only    t  3/8     high,  3-5/S" 

wide.  8"  long. 
All   ICs  are  mounted  in  high  quality  insulated  sockets  and  all  parts  are 

marked, 

r-Tanufactured  by  VANGUARD   LABS  renowned  lor  quality  »«t  »852. 


NOTE:  Our  45  MHz  receive  synthesizers  are  now  in  production.  Call  us  for  details. 
IMPORTANT;  When  ordering  be  sure  to  state  the  output  frequency  you  want. 


PRE-AMPS 


CONVERTERS 


VHF  FM  RECEIVER 


HIGH  GAIN  •  LOW  NOISE 

35  dB  power  gain,  2.5—3.0  dB 
N  F.  at  150  MHz,  2  stage,  R.F, 
protected,  dual -gate  MOS- 
FETS.  Manual  gain  control 
and  provision  for  AG C.  4-3/8" 
x  1-7/8"  x  l-3/8M  aluminum 
case  with  BNC  receptacles  and 
power  switch.  Available  fac- 
tory tuned  to  the  frequency  of 
your  choice  from  5  MHz  to 
350  MHz  with  approximately 
3%  bandwidth.  Up  to  10% 
B  W.  available  on  special  or-, 
der. 
Model  201  price: 

5—200  MHz $24.95 

201-350  MHz $28.95 


HOW  TO  ORDER: 

AM  the  items  on  mis  page  are  available  only  from 
Vanguard  Labs,  for  receivers  and  converter!,  state 
model  input  and  output  frequencies  and  band- 
width were  applicable.  Remit  in  full,  including 
salts  tax  if  you  reside  in  New  York  State,  direct  to 
Vanguard  Labs,  Prices  include  postage  by  regular 
parcel1  post.  For  air  mail  or  specta1  delivery  include 
extra  amount;  excess  will  be  refunded,  Send 
money  order  or  certified  check  for  faster  shipment. 


40  dB  GAIN  2.5-3.0  N.F.  9  150  MHz 

2  RF  stages  with  transient  pro  tec  lied 
dual-gate  MOSFETS  give  this  converter 
the  high  gain  and  low  noise  you  need  for 
receiving  very  weak  signals.  The  mixer 
stage  is  also  a  dual-gate  MOSFET  as  it 
greatly  reduces  spurious  mixing  products 
—  some  by  as  much  as  100  dB  over  that 
obtained  with  bipolar  mixers.  A  bipolar 
oscillator  using  3rd  or  5th  overtone 
plug-in  crystals  is  followed  by  a  har- 
monic bandpass  filter,  and  where  neces- 
sary an  additional  amplifier  is  used  to 
assure  the  correct  amount  of  drive  to  the 
mixer.  Available  in  your  choice  of  input 
frequencies  from  5—350  MHt  and  with 
any  output  you  choose  within  this  range. 
The  usable  bandwidth  is  approx,  3%  of 
the  input  frequency  with  a  maximum  of 
4  MHz.  Wider  bandwidths  are  available 
on  special  order.  Although  any  frequen- 
cy combination  is  possible  (including 
converting  up)  best  results  are  obtained 
if  you  choose  an  output  frequency  not 
more  than  1/3  or  less  than  1/20  of  the 
input  frequency.  Enclosed  in  a  4-3/8"  x 
3"  x  1-1/4"  aluminum  case  with  BNC 
receptacles,  power  and  antenna  transfer 
switch.  Thousands  of  our  converters  are 
now  in  use  by  satisfied  customers,  many 
of  whom  are  government  agencies  and 
universities. 
Model  407  price: 

5-200  MHz ,  .  $49.95 

201-350  MH7 $54.95 

Prices  include   .005%  crystal  Additional 
crystals  $5.95  each. 


11  CHANN 


•  135-250  MHz 


11  crystal-controlled  chan- 
nels •  Available  in  your  choice 
of  frequencies  from  135—250 
MHz  in  any  one  segment  from 
1—4  MHz  wide»LF.  band- 
width (channel  selectivity) 
available  in  your  choice  of 
±7.5  kHz  or  ±15  kHz.  #  8-pole 
quartz  filter  and  a  4-pole  cera- 
mic filter  gives  more  than  80 
dB  rejection  at  2X  channel 
bandwidth  #  Frequency  trim- 
mers for  each  crystal  #  .2  to  .3 
(Avail  for  20 dB  quieting  #  Dual- 
gate  MOSFETS  and  integrat- 
ed circuits  •Self-contained 
speaker  and  external  speaker 
jack  •  Mobile  mount  and  tilt 
stand  #  Anodized  aluminum 
case,  6*'  x  7*s  x  1-3/8*% 
Model  FMR-250-11  price; 
135—180  MHz   .  .  .  .  .  $119.95 

181—250  MHz $129.95 

Price  includes  one  .001% 
crystal.  Additional  crystals 
$6.95  each. 


VANGUARD  LABS 


Cat!  21 2  468-2720  for  fast  C.O.D.  shipment. 

196-23  JAMAICA  AVE.  HOLLIS,  N.Y.  11423 


130 


73  MAGAZINE 


MILITARY  ELECTRONICS 


PAGES. 


iromc 


copy 


BRAND  NEW  BC  645  TRANSCEIVER 

EASILY   CONVERTED   FOR 
420MC   OPERATION 
This  equipment  originally 
cost  over  $1000,  You  get 
all  in  original  factory  carton. 

Dependable  Two  Way  Communication  more  Than  15  miles. 

•  FREQUENCY  RANGE:  About  435  to  500  Megacycles. 

•  TRANSMITTER  hs  4  tubes:  WE^316A,  2-6F6,  7F7. 

•  RECEIVER  has  1 1  tubes:  2  955,4  7H7,  2-7+6.  3-7F7. 

•  RECEIVER  IF.:  40  Megacycles. 

•  SIZE:  10^"  x  12%"  x4lA" 

Makes  wonderful  mobile  or  fixed  rig  for  420  to  500  Mc. 
Easily  converted  for  phone  or  CW  operation 


SPECIAL   PACKAGE   OFFER 


BC-645     Transceiver,     Dynamotor    and     all    BRAND   NEW, 
accessories  below,   including  conversion  in-    while  stocks 
structions  for  Citizens  Band.  last.        $26.95 

F,O.B.  NY  City  or  Ogden,  UT  for  Savings  on  Freight  Charges, 


Accessories  for  BC-645 
Mounting     for     BOG4S     trans- 
ceiver 

PE-101C    Dynamotor,   12-14  V 
(easily  converted  to  6  volts). 
Mounting    for    PE-TQ1C    Dvna- 

TRANSCEIVER  ONLY 


motor 

UHF  antenna  assemblies  iset  of 

2) 

Complete  set  of  11  connectors 

Control  Box  BC646 

Mounting  for  BC-646  ctr.  box. 

$16.95 


SCR-274N,  ARC-5  COMMAND  SET  HQ! 


Freq. 
Range 

RECEIVERS 

190-550  Kc 
6-9.1    Mc 
1.5*3    Mc 
TRANSMITTERS 
4-5.3   Mc  .   


Used 


Type 

Complete 
with  Tubes 

BC-453 

8C-455 

R25 

Complete  with  Tubes 

BC457  $8.95 

BC-458  $8.95 


Like 
New 


BRAND 

NEW 


$14.50        $19.50  — 

$21.50 


$11.95 
$11.95 


CRT 

AGEJNG  & 
CHECKING 
TESTER 

$6.95 


WILLARD  2-VOLT 
STORAGE   BATTERY 
(Model  20-2) 

Rated  at  20  ampere 
hours.  Compact, 
rechargeable,  fine 
for  models. 

$2.79 


BC  1206-C   RECEIVER  Aircraft  Beacon  Receiver  200 

to  400  Kc,  Operates  from  24V  DC  1.5A,  Continuous  tuning, 

vol  control,  on-off  switch  and  phone  jack.  Very  sensitive. 

Compact. 

Complete  with  tubes,  NEW $12.50 


ARC-R1 1 A  Modern  Q-5  Receiver  190  -  550  Khz  $10.95 

ARC  R 22  540^  1600  Khz  Receiver  with  tuning  graphS  1536 
R4/ARR  2  Receiver  234-  258  Mhz,  1 1  tubes,  NEW      $8.95 


BC  348  Radio  Receiver 
BC-312  Radio  Receiver 
AN/ARN-7  Receiver    .  . 


.  .  .  + 


■      •      4       * 


*     ^     *     w 


$5850 

$69,50 

.._  $19,50 


BC  604   FM  TRANSMITTER  20  to  27.9  Mc.  Out- 
put  appro*  30  watts. 

Complete  with  tubes. 

NEW . $9  50 


BC-603  FM  RECEIVER 

Converted    for    35—50    Mhi,    10   preset   pushbutton 
channels  or  manual  tuning.  Complete  with  10  tubes, 

checked  out,  like  new, ,.**„. ,..»**f< *-.* 534*50 


AC  Power  Supply,  New  .  .  ,  , . $14.95 

DM-34  12V  Power  Supply,  New   , $  4.45 

DM-36  24V  Power  Supply,  Exc.  Used $  2,25 

Technical  Manual ...,•.,»..,......$   2.50 

Set  of   10  tubes   for   BC-603   Receiver $   5.95 


J 


AN/APR-4Y  FM  &  AM  RECEIVER 

"FB"  for  Satellite  Tracking! 

High     precision    lab    instrument,    for    monitoring 

and     measuring    frequency     and     relative    signal 

^^         strength,    38    to    4000    Mc.    In    5 

^A  tuning       ranges        For       llOv      60 

|  ™  cycle   AC,    Built-in    power   supply, 

J  rjfci  \    Original     circuit    diagram     includ- 

■ftS      mm  ■    ecl*    Checked    out,    Perfect. 

DW0>V   LIKE  NEW       $79.50 

All    tuning   units   available   for   a 

bove.    Price    upon    request. 


TG  34A  CODE  KEYER,  self -contained,  automatic,  repro- 
duces code  practice  signals  from  paper  tape,  5  to  12  WPM 
Built-in  speaker.  Brand  new  with  tech  manual,  takeup  reel 

and  AC  line  cord  .  *  -  >  * ...............  $24,50 

Code  practice  tapes  for  above  P.LLR. 


MN-26Y 
RECEIVER 


Like  New  $13.50 
New         $15.25 


Remote  control 
commercial  type 


Designed  for  Marine  &  Aircraft  installa- 
tion. Also  fine  for  home  use.  Continuous 
tuning  from  MN-28C  Control  bo*.  Com- 
plete with  24  vol!  DC  Dynamotor. 
MN-26S  Radio  Receiver,  150-325  KC. 
3259-695  KC.  3-4.7  Mc.  Complete  with 
tubes  and  dynamator. 


navigational  receiver 

ACCESSORIES  FOR  ABOVE  AVAILABLE  FROM  STOCK 


ARC-5  VHF  RECEIVER.  TRANSMITTER,  MODULATOR  100-156  Mhz 

R-2S  RECEIVER  with  tubes  and  crystal, 

Excellent  Used „.„.„ $19.50 

T-23  TRANSMITTER  with  tubes  and  crystals. 

Brand  New  in  Original  Carton... 523,50 

MD-7  MODULATOR  with  tubes. 

Excellent  Used. „ ,„ „ $  10.50 

Set  of  Plugs  for  MP-7 ^ , S8.50 


LM  FREQUENCY  METER 

Fine  general  purpose  Navy  unit  125  to  20r000 
Hi,  Operates  on  12  or  14V  dc.  Complete  with 
tubes,  crystal  calibration  book.  Checked  out. 
Excellent  Used  $49,50 


APN-1  FM  TRANSCEIVER  400-450  Mc. 
Freq.  modulated  by  moving  coil  trans- 
ducer. Easily  converted  for  radio  con- 
trol or  70  cms.  Complete  with  14 
tubes,  dyn.  BRAND  NEW     $9,95 


HANDMIKE 

Rugged,  heavy-duty  carbon  handmike  with  press- to- 
tal k  switch.  Equipped  with  4-ft  cord  8t  phone  plug. 

SPECIAL 
NEW,  Boxed Each  $1.88  2  for  $3.25 


HEADSET   Low  impedance.  With   large  chamois  ear  cushions. 
4-ft  cord  and  plug.  Reg.  $12.50.  Our  Special  Price  $2.95 

Less  ear  cushions $1.95 

High  impedance  adaptor  for  above  .  .  $  .69 


DUAL  AMPLIFIES         hoi  two  Input  circuits  «och 
fwding  a  linoU  6SM7GT  twin  tried*  ampllfl m . 
CampJ***  wild  115V  60  cy.  paw«r  lupply 
mb*  6X5GT  recHflw.    NEW $5.95 


SCR- 625  WINE  DETECTOR 

locates  any  metal  buried  appro x.  2  ft 

in  ground  or  water.   Easy  to  operate. 

Our  Special  Price,  less  batteries 


$44.50 


SCR-522  TRANSMITTER/RECEIVER    $34.50 

Designed  to  operate  from  100  to  156  mc  Like    new   $39.50 


CATHODE  RAY  TUBES  All  Mew  in  Original  Carton 

STANDARD  MAKE 

3AP1* $2,95        5MP1 $2.75 

3FP7* $1.45  ea.  9GP7 $4.95 

3CPT ..„.  $1  98  ea*  *  Sold  in  Lots  of  3  Only 

3"  Shietd„+,..$2.49        5"  Shield.„„„ $3.25 

*3        a  flCJ    ^J        OtJl*  In  C  Lj  ..f4ti«*t ■■■•« turn  *■    Uv»    Cu  . 

3"  and  5"  tubes  sold  with  shields  and  sockets  only 


"© 


TERMS:  F.O.B,  NYC.  25%  depost  with  order,  balanceCOD  or    remittance 
rn  full.  MINIMUM  ORDER  $5,00.  Subject  to  prior  safe  and  price  change. 

G&G  RADIO  ELECTRONICS  COMPANY 

45  Warren  St,   OEPT.  SO    New  York.  N.Y.  10007   Pti.  21 2-267-4605 


DECEMBER  1973 


131 


— 


No  Sales  Tax  to  Out-of-State  Buyers 
We  SHIP  FREE  U.P.S.  Anywhere 


$569.95 


Swan  700CX 


MAS  SPECIALS 


Yaesu  FT-101 

$649.00  MAS  TIMS 


Collins  KWMZA 

$1493.00  MAS    DEALS 


Standard  SR-C14U 

$595.00  MAS  SALS 


A  DIVISION  OF  TREV0SE  ELECTRONICS 


W3MFY     WA3USJ    WA3CAG     WA3UTI     WA30VZ    WA3ICS 


215)  757-5300 


4033  BROWNSVILLE  RD.f  TREV0SE,  PA.  19047    IMHlcMMliTil 


132 


73  MAGAZINE 


••.    .         ■.-       ■ 


A  DIVISION  OF  TREVOSE  ELECTRONICS 


215)757-5300 


W3MFY    WA3USJ    WA3CAG     WA3UTI     WA30VZ    WA3ICS 

4033  BROWNSVILLE  RD.(  TREVOSE,  PA.  19047    tlrMWtl+MlhJl 


DECEMBER  1973 


133 


PRINTED  CIRCUIT  BOARD 

2  oz.  copper  on  glass  epoxy  base,  approx. 
one  or  both  sides. 


5"  x  6".  Your  choice  copper  on 

3  for  $1.00 


LED  READOUTS  "Lowest  Prices  Ever" 

Similar  to  MAN— 1    .33"  high.  20  mA  per  segment.  With  decimal  point. 
Everyone  checked  —  all  segments  operating.         Red  —  $2.00  each,  6/$10.00 

Green  -  $3.00 
Big  LED  Readouts  OPCOA  SLA3,  .7"  high  with  decimal  point  red.  Drive 
with  7447.  $4.95  each,  4/$18.00 

LED  —  molded  plastic  dome  shape  with  leads.  .312  inches  in  diameter. 

Red  -  $.25  each,  5  for  $1.00 

Green  or  Yellow  -  $.40  each,  5  for  $1.85 


KODAK  RED  Wratten  Filters 

Perfect  for  light  filter  over  red  LEDs.  4"  sq.,  .005"  thick. 

$.35  each,  3  for  $1.00 

LM  309  Voltage  Regulator  IC.  5  Volts  at  1  Amp  max.  current.  $2.00 

ETCHANT  FOR  P.C.  BOARDS 

Ammonium  persulfate,  1  lb.  of  crystals,  just  dissolve  in  H2O. 

DIGITAL  CLOCK  CHIPS 

MM5314M  24  pin  for  LED  or  incandescent  readout  4  or  6  digit,  12  or  24 
hours  output  strobe.  $10.95 

IN  914  DIODES  $.10  each,  $1.00  a  dozen 


$  1 .00 


TTL     ICs 

/4ULf «  .  4>    iuU 


7402  . . 
7404 . . 


30 

. . 35 

7408 30 


7441  . . . 
7447 . . . 
7448  .  .  . 
7473 .  .  . 


■    ■ 


•     ■■•■■••a 


•     •     •      • 


■     ■ 


1.75 
1.40 
1.65 

.55 


7474 

7475 

74.7R 

7490 

74121 

741  op  amp 


1    • 


..    ■ 


.55 
.85 
.60 

1.00 
.60 

1.90 
.55 


Please  add  shipping  charges 


MINIMUM  MAIL  ORDER  $2.00 


SEND  FOR  LATEST  FLYER  OF  SURPLUS  AND  NEW  ELECTRONICS 


1916  Clark  Avenue  Cleveland,  Ohio  44109 


134 


73  MAGAZINE 


Semiconductor  Supermart 

•  MOTOROLA  •  RCA  •  FAIRCHILD  •  NATIONAL  •  HEP  •   PLESSEY 


POPULAR  IC's 

MCI  550 

Motorola  RF  amp 

.$1.80 

C  A  3020 

RCA  Y*  W  audio 

.  $3.07 

CA3020A 

RCA  1  audio    

.  $3.92 

C  A  3028  A 

RCA  RF  amp . 

.$1.77 

CA3001 

$6.66 

MC1306P 

Motorola  Y»  W  audio 

.  $1.10 

MC1350P 

High  gain  RF  amp/I F  amp  . 

$1.15 

MC1357P 

FM  IF  amp  Quadrature  det 

.$2.25 

MC1496 

Hard  to  find  Bal.  Mod 

.  $3.25 

MFC9020 

Motorola  2-Watt  audio  .... 

.  $2.50 

MFC4010 

Multi-purpose  wide  band  am 

p$1.25 

MFC8040 

Low  noise  preamp   

.$1.50 

MC 1 303P 

Dual  Stereo  preamp 

.$2.75 

MC 1 304P 

FM  multiplexer  stereo  demod  $4.95 

FETs 

MPF 102  JFET $.60 

MPF105/2N5459  JFET $.96 

MPF107/2N5486  JFET  VHF/UHF $1.26 

MPF  121  Low-cost  dual  gate  VHF  RF  .  .  $.85 

Dual-gate $1.98 

Dual-gate   $1.75 

Dual-gate $1.95 

Dual-gate    $1.85 


MFE3007 
40673 
3N140 
3N141 


NEW  FAIRCHILD  ECL 
HIGHSPEED  DIGITAL  IC'S 


9258  Dual  "D"  FF  toggles  beyond 


160    MHZ 
.  ,  .    $4.65 


9582  Multi-function  gate  &  amplifier  .  .  .  $3.15 
95H30  300  MHz  decade  counter  .*-•-..  $16.00 
A  95H90  &  9582  makes  an  excellent  prescaler 
to  extend  tow  frequency  counters  to  VHF  —  or 
use  two  9528s  for  a  160  MHz  prescaler. 


SIGNETICS  PHASE  LOCK  LOOP 

NE561B    Phase  Lock  Loop $4.75 

NE562B    Phase  Lock  Loop $4.75 

N5111A   FM/IF  Demodulator $1.50 

NE566V   Function  Generator., $4.75 

NE567V    Tone  Decoder  $4.75 

TTL  BARGAINS 

7400 $-28 

7401    $.30 

7404    $-30 

7410 $-30 

7420   $  30 

7446/7447 $1 .50 

7475   $1  -00 

7490    $1-00 

74192 $2-00 


NATIONAL  CLOCK  CHIP 


$12.50 


Set  of  circuit  boards  to  build 
a  digital  clock  $5.00 


CORES  AND  BEADS 

T200-2 $2.00 

KW  Balun  kit  only $3.50 

T68-2  3  cores $1.00 

T50-2  3  cores $1.00 

T50-6  3  cores $1.00 

T50-10  3  cores $1.00 

T44-10  3  cores $1.00 

BEAD  SPECIAL 


Ferrite  Beads  1  doz. 


$1.00 


DEVICES  AT 


INTRODUCING 
NEW  LOW  PRICES 

LA3018  {Replaces  CA3018 

LA3046  (Replaces  CA3046) 

LS370  (Replaces  LM370) 

LSI 496  (Improved  MCI 496) 

LS3028A  (Replaces  CA3028) 

LP1000  (A  new  fun-type  device  to  make 

LED  flashers,  audio  osc,  timer  etc.)        1 .60 

LP2000  Microtransmitter  16.00 


$1.60 
1.60 
4.00 
2.00 
1.60 


THINKING 


R-4C 


DRAKE 


TR-4C 


T-4XC 


Check  us  out 


TR-22 


NOW  OPEN  FOR  LOCAL  SHOPPING 
STOP  BY  AND  CHEW  THE  RAG 

1 1 10  N.  Scottsdale  Road 
Hayden  Plaza  East 

Please  add  354  for  shipping 

Circuit  Specialists 

Box  3047,  Scottsdale,  AZ  85257 

FACTORY  AUTHORIZED  DISTRIBUTOR  FOR 

Motorola  HEP  -  Circuit-Stick  -  Plessey 

AH  devices  are  first  quality  and  are 

fully  guaranteed.  


DECEMBER  1973 


135 


the  most  powerful  antennas  under  the  sun! 


The  Best  Vertical  There  IS! 

80  through  10  meters 

hy  gain  18AVT/WB 

New,  from  the  inventors  of  wideband  verticals. 

Pack  some  punch!  All  the  omnidirectional  performance  of  Hy-Gain's 

famous  14AVQ/WB,..pIus  80  meter  capability!  Unrivaled  performance, 
rugged  extra  heavy  duty  construction,  and  the  price  you  want,.. all  in 
one  powerful  package! 

■  Automatic  switching  on  all  five  bands  through  the  use  of  three 
beefed-up  Hy-Q  traps.-,  featuring  extra  large  diameter  coils  for  ex- 
ceptional L/C  ratio  and  extremely  high  Q. 

■  Recessed  coax  connector  furnished. 

Top  loading  coil  and  four  element  static  hat. 

Constructed  of  extra  heavy  wall  high  tensile  aluminum. 

Hot  performance  all  the  way  across  the  band  with  just  one  setting 
(10  through  40), 

Hy-Q  traps  effectively  isolate  antenna  sections  for  full  1/4  wave 
resonance  on  all  bands. 

No  dissimilar  metals  to  cause  noise. 
SWR  2:1  or  less  at  band  edges. 

Maximum  legal  power  with  low  frequency  drift. 

Exceedingly  low  radiation  angle  makes  DX  and  long  haul  contacts 

a  cinch.. .whether  roof  or  ground  mounted. 

Very  low  RF  absorption  from  insulating  materials. 


The  18AVT/WB  is  constructed  of  extra  heavy  duty, 
taper  swaged,  seamless  aircraft  aluminum  with  full 
circumference,  corrosion  resistant  compression 
clamps  at  all  tubing  joints.  This  antenna  is  so  rigid, 
so  rugged... that  its  full  25'  height  may  be  mounted 
using  only  a  12"  double  grip  mast  bracket... no  guy 
wires,  no  extra  support... the  18AVT/WB  just  stands 
up  and  dishes  it  out! 


Order  No.  386 


$79.95 


Get  the  strength,  the  performance  and  the  price  you  want. ..from  the 
man  who  sells  the  complete  line  of  quality  Hy-Gain  equipment. 

HY-GAIN  ELECTRONICS  CORPORATION 


Dept.CM.  8601  Northeast  Highway  Six 

402/434-9151 


Lincoln.  NE  68507 
Telex  48-6424 


136 


73  MAGAZINE 


The  most  powerful  signals  under  the  sun! 


Redesigned 


Out-hustles  them  all! 

The  famous  HAMCAT.. .now  redesigned  for  greater  per- 
formance ...equafs  or  exceeds  the  performance  of  any  other 
Amateur  Mobile  antenna.  We  guarantee  it!  And  you  need  buy 
only  one  mast... whether  you  mount  it  on  fender,  deck  or 
bumper.  There's  just  one  set  of  coils  and  tip  rods.,. and  they 
all  stand  up  to  maximum  legal  power  That's  performance, 
that's  value... THAT'S  HY-GAIN! 

Original  Hy-Q  "quick  changer'  coils  wound  on  tough  fiber- 
glass coil  forms  for  greater  heat  resistance,  less  RF  absorption 
/  Fiberglass  shielded  coils  cant  burn  up,  impervious  to 
weather  /  Shake-proof,  rattle-proof,  positive  lock  hinge  now 
even  stronger  ...eliminates  radio  noise  /  All  stainless  steel  tip 
rods  won't  bend  or  break  /  Full  5'  mast  gives  you  10%  more 
radiating  areathan  the  competition  /  Rugged  swivel-lock  stain- 
less steel  base  for  quick  band  changes,  easy  garaging. 

Get  the  Hamcat...from  Hy-Gain 

Order  No  257  All  new  design  5'  long  heavy  duty  mast  of  high 

strength  heavy  wall  tubing  $17,95 

Order  No.  252  75  meter  mobile  coil  $19,95 

Order  No.  256  40  meter  mobile  coil  $17,95 

Order  No.  255  20  meter  mobile  coil  $15,95 

Order  No.  254  15  meter  mobile  coil  $12.95 

Order  No  253  10  meter  mobile  coil  $11,95 

Order  No.  499  Flush  body  mount      $  9,95 


Order 
No 
492 


h#  rod 


07  lb* 


C0*L  ASSEMBLY  CUT  AWAY 

A.  Gfcrwne  plittd  bf»i  titTm|i 

&  inner  tib*t|iiii  con 

t  facisioa  COii 

D  Ovter  f  tteffittt  th*dd 


»P«C**L  ■* 


All  penfuntfili* 

«rnp ref  mred  m\h 
ilutt-ptooi 


No.  253  No.  254  No.  255  No.  256 


HY-GAIN  ELECTRONICS 

Dept  CM.  8601  Northeast  Highway  Six 
402/434-9151 


No.  499 


Lincoln,  NE  68507 
Telex  48-6424 


DECEMBER  1973 


137 


GTX-2 

30  WATTS 
OUTPUT 


100%  American  Made 


GTX-200 

30  WATTS 
OUTPUT 


(1)  GTX  2  (built  m  DC  PS)  and  94/94 

(2)  Deluxe  8  Amp  Regulated  AC  Power  Supply  -  ■ 

(3)  2  extra  crystals  your  choice  (stock  tistj    

REGULAR 
OUR  SPECIAL  PACKAGE  PRICE 


.  S69.95 
.S1Z0O 

$331,90 
$269.00 


GTX-10 


10  WATTS  OUTPUT 


100  channel  combinations;  features  independent  selection  of 
transmit  and  receive  frequencies,  and  switch  for  preselected 
pairing. 

(1}  GTX-20G  (built-in  DC  PS)  &  94/94 .  .  . $259,95 

(2}  Deluxe  8  Amp  regulated  AC  Power  Supply    $69.95 

(3)  2  Extra  xtals  your  choice  (stock  list)    , . .  T .  $1  2,00 

REGULAR  -5341.90 
OUR  SPECIAL  PACKAGE  PRICE  -  $279.00 


0)  GTX-  10  (built  in  DC  PS)  &  94/94 S199.95 

(2)  AC  Power  Supply   .  .  . . $34.95 

(3)  2  Extra  xtals  your  choice  (stock  list)    .......-,.  $1 2.00 

REGULAR  -S246.90 

OUR  SPECIAL  PACKAGE  PRICE  -  S199.95 

Please    add    $10.00    Substituting    HAMPAK     for    AC    on 

GTX-  10  Package.  Wrth  HAMPAK  &  AC  ."_..■..,„-.  $229.00 


*      FLASH      *      FLASH     *      FLASH     * 

Look  at  what  you  get  for  NO  -  REPEAT  -  NO  EXTRA 
CHARGE:  The  GTX  2  and  the  GTX-200  have  a 
super-sensitive  Dual-Gate  Mos  Fet  pre-arnp lif ier  Built-in  the 
receiver  front  end  for  superb,  less  than  ,25  microvolt 
sensitivity.  THE  BEST  receiver  now  even  better! 


HAMPAK 


«                               It 

■     /    '          1    * 

f                  f 

* 

RM 

UBtt 

flbr 

nuai    fE 

*      IMfflil 

1  mws 

U) 

roi 

» 

Nfi.   <t   Mf           M) 

CLEGG  FM-27BS 

Reg.  $479.95,  or 
with  Clegg  AC. . . 
Reg.  $559 

WRITE  FOR 
SPECIAL  DEAL! 


Battery  pack  for  GTX-10  portable  operation.  Uses  10  D 
celts  (not  included).  Includes  portable  antenna,  carrying 
handle  &  mrke  clip , $39,95 

30  WATTS  OUTPUT.  ALL  SOLID  STATE  (no  tubes)  TRUE 
FM  (not  phase  modulation)  for  superb  audio  quality.  10 
channels  ih  GTX  2  &  GTX-10  with  146.94/146.94  included. 
Three  pole  low  pass  filter  on  both  transmit  and  receive,  1 
watt  low  power  position,  Provision  for  tone  encoder.  Simple 
internal  strapping  provision  allows  multi-channel  use  of  any 
crystal  in  GTX-2  and  GTX-10.  Microphone  and  LOCKABLE 
MOBILE  MOUNTING  BRACKET  SUPPLIED,  G-10  GLASS 
BOARDS.  Professional  level  construction  by  distinguished 
Avionics  Mfg,  -  General  Aviation  Electronics,  Inc.  The  finest 
amateur  FM  transeiver  available  at  any  price.  Size.  9  x  67*  x 
2%.  Weight  5  lbs.  Current  Drain:  Receive:  .09  amps. 
Transmit:  High  5.0  amps,  Low:  1,7  amps,  Made  in  U.S.A. 


MIDLAND  13  520 

SUPERB  QUALITY  C^ 

2  watts,  6  channels  with   $229.95 
carrying  case  and  16/76,  cO^1 

34/94  &  94/94.  ^^    p,V 

Please  write  for  special  ^*  cJF^  ^  \ 
packages  with  NI-CAD  Qfc^ 

pack,  charger,  etc. 


REGENCY,  CLEGG,  SBE,  INOUE,  GLADDING,  MIIDA, 
CUSHCRAFT,  DATA  ENG.,  BIRD,  OLIVER  SWAN  (KLM), 
HYGAIN,  SAVOY,  B&K,  LEADER,  KENWOOD,  TEMPO( 
TEN  TEC,  DX  ENG„  MINI  PRODUCTS,  SWAN,  MIDLAND, 
ETC,  IN  STOCK  -  PLEASE  WRITE  FOR  QUOTE. 


B8.K 

WHITE   FOR  SPECIAL  LIST 

Rng 

Our   PriCfl 

COR 

HAMM'i,  rww 

129.00 

99,00 

CLEGG 

FM  278,  1  mo  new 

479.00 

359.00 

COLLINS 

62S  1  6  $t  2  [fWwvrtw 

£95.00 

595.00 

KWM  1  ttvi    W/S16F   AC 

<md  31  ?B  3 

(wmt?  m  3I2B4)  lihr  ww, 

495.00 

3754)0 

DRAKE 

TR  23,  likpnw 

179  00 

149,00 

2MT  CW  Mttirie*,  raw  COM) 

119.00 

89.00 

2  a  rcvr  */?8Q  "O"  muii/i^k 

710.00 

16900 

3W  4A  G*n   cow    irvi  .  hica  new 

249  00 

199.00 

Murfct'  Lu^uiy  2M  FM,  built  m 

AC/DC  w'muarii,  m.* 

269.00 

225.00 

EICO 

712  P  to  P  VTVM  kit.  new 

34  95 

19,00 

GALAXY 

FM  ?1Q  2M  FM  w/AC  310 

AC  0*  *n*J  pown    Uotrilrr 

6  * 141*  arid  m*k<* 

169  00 

109  00 

GLADDING 

2b  2m  FM  ?5  ajii 

a'I?  mall    <ik?  rlfn 

199.00 

159.00 

HALLlCRAfTf  RS 

SR47A  ?m  »cvr    nf^cortd 

?  *mU,  thtlt  in.  AC'DC 

149  X» 

99.00 

HA  76  VFO  foi  ibdw  16  &  2 

VFO) 

19  00 

25  DO 

SR  ISO  SO  10  *cvr  w/PS  150 

AC/ipk 

SX-71  revr. 

FPM-300  1  mo.  n*w+  factory 

checked 

HEATH 

IOW  102  DCSMcfcope, 

fact,  wired,  new  cond 

HD  11   "Q"  mull,  buiiMn  AC/ps 

SB- 10.  as  it 

HVW-17A  AMfFM  2m  mot. 

built-in  AC/ DC  pi,  mike, 

w/HWA  17-2  FM  adaptor 

KNIGHT 

TRIOS  15  **ait  2m  *rwr, 

tKjJt-in  AC/DC  pi.  mikf 

T-150  urmner 

HY  GAIN 

LP-62  log  period*  6  &  2  am, 

gem  2m  15  dB/6m  8  dB.  mrw 

KENWOOD 

R-599  teceiwt,  new,  warranty 

T599  emitter,  new,  warranty 

R-599  revr  w/6  ft  2  cofws. 

i  ml  ailed,  new  cond. 

T-599  nmmef ,  I****  new 

R-599  revr.  >tke  new 

MIIDA;  E  let  ironic  Calculator?  ami 

I  all   1  yr    warranty) 
MC  840  S  digit    cals 


Reg. 

Ou*  Price 

MC-B30K  6  digit  calf.,  new. 

R»a- 

Our  Price 

350  00 

249  00 

AC/DC  builMn 

149.95 

109.00 

109.00 

4B.0O 

M0 121 4  16  digsl  cals.. 

wtili /memory  new 

1 99.95 

139  00 

475.00 

399.00 

No.  6854  auiot anting  4  % 
digit  digital  multimeter 

w/BCD  output 

699.00 

495.00 

1B9.00 

119.00 

MIDLAND 

15.00 

6.00 

1900 

13  509  220  FM,  2  mod,  new 
NATIONAL 

219.00 

169.00 

NCL  2000  2KW  linear,  like  new 

349.00 

295  00 

POLYCOM 

1B9  00 

175  00 

62B  18  watt  €  &  2m  KCw,  mike 

built  m  ACmC  and  VFO 

178  J» 

139.00 

SWAN 

99  00 

79  00 

350  Haul  1 1  7X  AC.  spk. 

§9.00 

49J00 

DC  mod. 

250  6m  *cvr  w/1 1 7X  AC  and 

369  00 

289  00 

DC  mod. 

199.00 

269  JM 

63.50 

39  00 

STANDARD 

SRC  826M  w/4  chans 

389.00 

309.00 

new  cond 

389.00 

729.00 

429  00 

319,00 

TPL/TEMPO 

24  hr.  dxgital  dock,  new 

89.00 

mm 

389  00 

299  00 

LW  1500  2KW  dummy  load/ 

349.00 

279  00 

wan  meter 

119.00 

89.00 

329.00 

759.00 

T6NTEC 

i  DVM 

Argonaut  405  S5B  BO-IOxCvr 

w/505  linear.,  like  new 

389.00 

319.00 

11995 

87  00 

PM  2-B  80-40-20  aevr.  n«w 

65  96 

39X10 

GB 


PkHO 


OP 


ening 


M 


^Ce^ 


tacM 


Bra 


,ncfr 


Stoc« 


f\6, 


Ken 


toc^V 


NO  ONE  ANYWHERE  BEATS  OUR  DEAL! 

AMATEUR-WHOLESALE  ELECTRONICS 


SwkAmeripwo 


i& 


000% 


881 7  S.  W    i  29  Terrain  -  Miami,  FL  33 156  / 

Telephone  -  days  (305)  233  3631  -  night  and  weekends  -  (305)  666  1347 


mastef  c targe 


We  carefully  and  professionally  service  everything  we  sell.  An  employee  always  answers  our  night  and  weekend  phone  -  not  an  answering  service. 


138 


73  MAGAZINE 


LIKE 


TOUCH  TONE  PADS 

More   features    than    any    other    pad    including    built-in 
monitor  speaker   and    latest    Phase-Lock    loop   circuitry. 

TTP-1       Standard       pad      for      portable      transceiver 
mounting. 

TTP-2   Standard    pad    in    attractive   case   for   home   or 
mobile   use* 

TTP-3     Mini-pad     in     attractive     case     for     home     or 
mobile   use. 

TTP-4   Mini-pad  for  portable  transceiver  mounting. 

TTP-1,  2,  3  &  4,  5h.  wt.  1  lb.  ..„„ $44,50 

r*lR|   ^FVf    jn    at  4*%*   Oil'    WTC»    JL    ID*   ++,***..*.++++,*■■■■.     ^JfiOv 


CRICKET  1 

A  popularly  priced  IC  keyer  with  more  features  for 
your  dollar.  Cricket  1  is  a  small  size,  solid  state  keyer 
designed  for  the  beginner  as  well  as  the  most  ad- 
vanced operator.  It  provides  the  user  with  fatigue-free 
sending  and  its  clean*  crisp  CW  allows  for  easy  copy- 
ing at  all  speeds.  Turned  on  its  side,  the  Cricket  can 
be  used  as  a  straight  key  for  manual   keying. 

CRICKET  1  Sh.  Wt  3  lbs.  $49.95 


2-METER   PREAMP 

Specially  made  for  both  OLD  and  NEW  receivers.  The 
smallest  and  most  powerful  preamp  available.  Pro* 
vides    20dB   gain    at   2.5    N.F.   to    bring    in   the   weakest 

signals.  Sh.  wt,  4  oz.     $9.50  kit 

$12.50  wired 


Please  include  sufficient  postage  for  shipping. 


Then  you'll  lo  ve 
Data  Engineering's 
new  catalog 


Write  for  your  free  copy  today! 


DATA  ENGINEERING 


Ravenswood  Industrial  Park,  Springfield,  Va.  22151 

5554  Port  Royal  Road     ♦     703-321-7171 


DECEMBER  1973 


139 


RT-70/GRC  T     $20  each,  3/$50 

Latest  government  release.  Transmitter- Re- 
ceiver RT-70/GRC  covers  47  to  58.4  mc  FM. 
Requires  only  90  Volts  dc  and  6  volts  dc. 
Used,  visually  OK,  supplied  with  schematic. 

1  MC  crystal  used  for  calibration  ....  $4.00 
116  page  maintenance  manual  for  GRCS2.00 


URR-13  RECEIVER 

Listen  in  to  jet  planes,  Air  Force  1 1  U-2  spy  planes, 
FBI,  etc.  They  use  the  frequency  covered  by  this 
receiver  .  .  .  220  to  400  mc.  Possibilities  of 
covering  the  220-450  mc  band  by  re-tuning. 
Operates  from  regular  115  Volt  60  cycle,  requires 
only  antenna  and  speaker.  Tuneable  through  the 
frequency,  direct  reading  dial,  Schematic  and  write 
up  on  this  set  furnished. 

Visually  OK  condition  . . .  URR-13  •  $50.00 


CALCULATOR  KEYBOARD 

A  nice  purchase  by  us  due  to  contract  termination. 
Brand  new,  2  styles  available,  one  for  use  with 
Gen.  Inst.  C-500  chip,  another  for  use  with  Cal-Tex 
5001  and  5002  chips  or  Mostek  5010  and  5012 
chips.  Measure  approx.  2.6  x  3.7  inches. 

Calculator  Keyboard  -  $8.00  (either  one), 

any  2  for  $15.00 


LM  FREQ  METER  $35.00  . 


Lowest  price  yet,  W/ tubes, 
crystal  and  original  cali- 
bration book.  Look  OK 
but  unchecked.  Typical 
schematic  furnished. 
8  lbs #LM  35.00 


TCSRCVRorXIVITR 

Used,  look  good,  with  schematic,  receiver  or 
transmitter.  Frequency  range  1.5  to  12  MC. 
Three  bands,  VFO  or  crystal,  voice  and 
CW.  These  sets  Collins  design,  becoming 
scarce. 

RCVR  or  XMTR    $35.00 


RCA  INJECTION  LASER  DIODES 

Another  SUPER  SCOOP  by  Meshna.  Brand  new 
RCA  packaged,  considered  obsolete  by  RCA  but 

what  an  exotic  opto-electronic  device  for  the 
sophisticated  experimenter.  Only  several  hundred 
on  hand.  Values  shown  are  approx.  as  each  diode 
characteristic  varies.  Each  is  marked  with  correct 
value. 

6  watt 


1 0  WATT 


•     »    •    • 


•    <■*••■■■■«••«   w  I  U»UU 
■  «••••■■■   >  t  i   •  >  O  I  JfUU 


RCA  TD-XI  TUNNEL  DIODE 

Original    packaged,    each    factory    marked, 
with  spec  sheet. 

S  1.2 5  each,  5/S5.00. 


15  AMP  BATTERY  CHARGER 

Brand  new  GE  transformer,  25  amp 
fullwave  bridge.  Output  approximately 
15  volts  up  to  15  amps.  Ideal  battery 
charger  or  DC  source  for  general  use. 
With  instructions  ,  assembled  in  minutes. 


PK-4 


$7.50 


Postage  extra  on  above.  MESHNA  P0  Bx  62  E.  Lynn  Mass.  01904 


140 


73  MAGAZINE 


CALCULATOR  KEYBOARDS 

Brand  new  keyboards  for  hand  held  calculators. 
Two  styles  available.  One  for  CAL  TEX 
5001-5002-5012  or  MOSTEK  5010-5012,  An- 
other for  use  with  GEN  INSTR  C500. 

$8.00  each,  2/$15-00 


CT  5005  CALCULATOR  ON  A  CHIP 

Single  MOS  chip  with  all  logic  required  for  12 digit 
4  function  desk  top  calculator  with  extra  storage 
register  for  memory  or  constant.  Multiplexed  7 
segment  outputs  for  LED,  Incandescent,  Fluor- 
escent or  Gas  Discharge  displays.  Brand  new  and 
bargain  priced.  With  Specs. 

$8.00  each,  2/$15.00 


HP  LED  DISPLAYS 

Brand       new 

4-on-strip      LED 

display.     End     butt 

two  strips  and  come 

up      with     8     digit 

readout.      An 

unheard   of  SUPER 

VALUE     at     $8.00 

per  strip  of  4  digits. 

Two  strips  (8  digits) 

$15.00.  Another  strip  .  .  .  this  one  a  clock  readout. 

The  strip  has  2  digits  .  ,  •  space  ...  2  digits.  Perfect 

for  reading  hours  &  minutes. 

$8.00  per  strip,  2/$  15.00 


CMOS  4814  HEX  INVERTER 

DIP  with  operation  3 — 18  Volts.  Dual  diode 
protection  against  static  charge  destruction. 
Dielectrically  isolated  complimentary  MOS. 

$1.00  each,  12/S10.Q0 


DUAL  16  BIT  MEMORY 

Serial  MOS  by  PHILCO  in  TO-5  case.  Brand  new 

with  2  page  specs. 

#>LR  532  $1.00  each,  12/$1.00 


PHONE  PATCH  KIT 

Includes  all  parts,  instructions,  cabinet. 

AM  PATCH  -  $5.00  SSB  PATCH  -  $9.00 


2048  BIT  MOS  MEMORY 

MOS  LSI  random  access  memory  ^EC  6003.  All 
inputs  except  clock  are  TTL  compatible.  2048 
word  by  1  bit.  22  pin  ceramic  DIP.  With  specs. 

$9.00  each,  2/$  17.00 


VOLTAGE  CONTROLLED  OSCILLATOR 

Rare  item.  See  Pop.  Elect.  Mag,  Oct.  1973  for  uses. 

In  14  pin  DIP  package. 

#8038C  $9.95  each,  2/S18.00 


ASCII  KEYBOARDS  W/ENCODER 

From  Raytheon,  new  or  like  new.  5  extra  function 
buttons  each  side.  Open  faced,  no  cabinet. 
Schematic  provided.  Price  is  postpaid  world  wide. 

$46.00 


I  KI= 


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IBIS 

9  I     i 
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7400 SERIES  ICs 

Talk  about  bargains  .  .  .  this  is  a  whopper.  Due  to 
quantity  on  .hand,  we  are  reducing  this  item  to  a 
new  MESHNA  MESHU  GINA  deal.  About  100 
devices,  all  marked  and  easily  removed.  With 
shrinking  supplies  and  upward  direction  of  prices, 
this  makes  it  well  worth  going  into  the  salvage 
business.  This  Super  Mother  Board  can  be  stolen 
for  $6.00  each  or  6  for  $25.00.  We  also  have  these 
in  ST  600  series  DTL.  So  give  your  choice  .  .  . 
7400  series  or  ST  600  series.  Mix-l\J-Match  if  you 
wish. 
#SAN  $6.00  each,  6/S25.00 


yfleshM^ 


Postage  extra  on  above.  MESHNA  PO  Bx  62  E.  Lynn  Mass,  01904 


DECEMBER  1973 


141 


Since  we 
cannot  contact 
each  of  you 
individually 
we  would  like 
to  take  this 

opportunity 
to  thank  you 
for  all  your 
business  in 
1973  and  to 
wish  you  .  . . 


&eij  r  CAN 

BEAT  VUP^Shf% 


A  HAPPY  AND  PROSPEROUS  1974! 


DuPage  FM,  Inc. 
P.O.  Box  1 
Lombard,  III.  60148 
312-627-3540 


142 


73  MAGAZINE 


-^H 


INTERNATIONAL  ELECTRONICS  UNLIMITED 


YEAR   END  SPECIALS 


7402 
7437 
7442 
7453 
7473 
7490 
7493 
74123 


.22 
.45 

1.05 
.29 
.48 

1.10 

1.05 


6di 

ea. 

ea. 
ea, 

ea. 

ea. 

ea. 

ea. 


1101  2.00  ea. 

8223  5.95  ea. 

MAN1  3.50  ea. 

DL707  3.00  ea. 

MV10B  .20  ea. 

MV5020  .30  ea. 

Me4(T018)  .50  ea. 

LM309K  1.75  ea. 


MM5312     (24  pin)  Clock  Chip 

with  spec  sheet $7.95  ea. 

5002LSI      (40  pin)   Calculator  Chip 
with  spec  sheet $7.95  ea. 

MOS  Grab  Baq 
8  Untested  MOS  Mix  (dip)     $2.00 

50  Untested  MOS  Mix  (dip)  510.00 


special  prices  in  effect   through   December 


TTL 

7400 
7401 
7402 
7403 
7404 
7405 
7406 
7408 
7409 
7410 
7411 
7413 
7420 
7423 
7425 


.25 
.25 
.25 
.25 
.29 
.27 
.55 
.29 
.29 
.25 
.35 
.95 
.25 
.37 
.39 


7430 

7432 

7437 

7440 

7441 

7442 

7443 

7444 

7445 

7446 

7447 

7448 

7450 

7451 

7453 

7460 


.25 
.30 
.50 

.25 
1.25 

1.15 

1.25 

1.30 

1.25 

1.45 

1.45 

1.50 

.29 

.32 

.32 

.30 


7470 
7473 
7474 
7475 
7476 
7483 
7485 
7486 
7489 
7490 
7492 
7493 
7494 
7495 
7496 
74121 


.50 

.55 

.55 

.95 

.55 

1.25 

1.20 

.55 

3.25 

1.25 

1  05 

1.05 

1.10 

1.05 

1.05 

.55 


74123 
74145 
74151 
74153 
74154 
74155 
74157 
74161 
74164 
74165 
74175 
74181 
74192 
74193 
74194 
75195 


1.15 
1.25 
1.05 
1.45 
1.75 
1.35 
1.50 
1.65 
2.95 
2.95 
2.95 
4.50 
1.65 
1.65 
1.65 
1.15 


LED 

MV10B  Visible  red  SUPER  SPECIAL      .25  ea 
MV50  type  red  emitting  .25  ea  or  5/1.00 

MV5020  type  Large  red  .35  ea  or  3/1.00 

ME4  Infra  red  T0 18  ,69  ea 

MAN  1  The  Original  4.25  ea 

MAN  3  type  1 .95  ea,  3  or  more  1 .49  ea 

MAN  4  type  2.75  ea,  3  or  more  2.50  ea 

Data-Lite  707  (MAN  1  rep!)  3.25  ea 


LINEAR 

LM301  T05 

.45 

LM302  T05 

.95 

LM304  T05 

1.25 

LM308  T05 

1.25 

LM309K  T03 

1.95 

LM309H  T05 

1.25 

LM311  T05 

1.25 

LM380  Dip 

1.75 

LM709TO5-Dip 

.39 

LM723  Dip 

.75 

LM741  T05-Dip 

.45 

LM747  Dip 

*  ^j  ^J 

PHASE-LOCKED 

NE565 
NE566 
NE567 


LOOP 
2.95 
2.95 
2.95 


MEMORIES-with  data 


1101 
1103 
7489 
8223 


2.95 
7.95 
3.25 
6.95 


CALCULATOR   CHIPS 

5001  LSI      (40  pin) 

5002  LSI      (40  pin) 
5005      LSI      (40  pin) 


with  data 6.95  ea. 

with  data 8.95  ea. 

with  data 10.95  ea. 


8000  Series 

8091 
8092 
8093 
8094 

8095 
8123 
8214 
8280 
8520 
8551 
8810 
8812 
8831 
8836 


.6? 
.69 
69 
69 
69 
75 
95 

95 
1.45 
1.95 

.95 
1.25 
1.95 
1.25 


Data  only  for  above  chips  (refundable  with  purchase)   Si. 00 


DIGITAL  CLOCK. 


MM5311 
MM5312 
MM5314 
MM5316 


(28  pin) 
(24  pin) 
(24  pin) 
(40  pin) 


.  .  on  a  Chip 

with  spec  sheet 

with  spec  sheet 

with  spec  sheet 

with  spec  sheet 


11.95  ea. 

8.95  ea. 

10.95  ea. 

51.95  ea. 


10%  off   on   orders   of   $25.00   or   more 


74  LOO 

74L02 

74L04 

74L10 

74L16 

74L20 

74L30 

74L42 

74L51 

74L71 


Low  Power  Devices 

.40  74L72 

.40  74L73 

.40  74L74 

.40  74L78 

.40  74L85 

.40  74L86 

.40  74L90 

.80  74L93 

.40  74L95 

.60  74  LI  64 


.60 

.80 

.80 

.80 

1.25 

.95 

1.75 

1.75 

1.75 

2.95 


Satisfaction  guaranteed.  All  items  except  as  noted  are  fully  tested.  Minimum  order  $5.00  prepaid  in 
US  and  Canada.  California  residents  add  sales  tax.  Orders  filled  within  3  days  after  receipt.  Piease  add 
$.50  per  spec  sheet  for  items  priced  at  less  than  $1.00  each. 

INTERNATIONAL  ELECTRONICS 


P.O.  BOX  1708 


UNLIMITED 


MONTERY,  CA  93940 


DECEMBER  1973 


143 


likC    ft*" 


«.».**■* 


n^ 


MB  40 


At  the  time  this  ad  is  being  prepared,  we  have  a  new  MEMO  prototype  for  field 
testing,  and  with  13.5  VDC  in,  ours  puts  out  over  60  WATTS  key  down!  >.  Swan's 
previous  15  watt  rating  has  been  changed somewhat. 

Monobanders  are  completely  SWR  protected  —  a  shorted  or  open  load  won't 
hurt  them  .  .  .  and  all  are  bandpass  coupled  to  the  antenna  —  no  tuning  required. 

Size  —  looking  down  from  the  top,  if  you  placed  this  open  magazine  on  the 
radio,  short  side  of  the  magazine  to  the  front,  the  radio  is  about  V*  inch  narrower 
than  the  magazine  and  2  inches  shorter.  This  is  THE  RADIO  for  problem  no-space 
mobile  installations. 


THE  BEST  PART  tS  YET  TO  COME: 


MB-80A 
MB-40A 
MB-20A 


80  Meters 
40  Meters 
20  Meters 


$299.95 
$299.95 
$299.95 


lOOw 


.  ,  «  so  the  cost  of  going  mobile  on  sideband  is  proably  less  than  what  it  would 
cost  you  to  trade  the  old  fixed  rig  on  anyother  transceiver,  and  you  keep  the 
fixed  rig. 

Financing  available  through  General  Electric  Credit,    S3C0Q  down  and  only 

$10.00  monthly. 

. .  .  or,  use  your  Swan  credit  card  —  10%  down.  Write  today  for  credit  application- 
Send  your  S30.00  to  hold  your  new  Monobander  .  .  .  TODAY! 

EDJUGE  ELECTRONICS  .INC. 


3850  S.  FREEWAY 

FT.  WORTH,  TEX  76110 


111811  HARRY  HINES 
DALLAS,  TEX  75229 


Closed  Sun.  &  Mon. 


144 


73  MAGAZINE 


D 


MJ®@ 


WINTER  1973 


^m 


©111®  STT AITS  §TO 


mt 


800N.  PROVIDENCE  RD.     l3*\A\  4m43-3673    TWX  9ia76G-1453 

COLUMBIA,  MISSOURI  65HQ1 


Dear  Customer: 

We  are  pleased  to  offer  you  this  Winter  197  3  Edition  of  our  complete  parts 

catalog-   Those  of  you  that  have  received  previous  catalogs  will  want  to 
take  notice  of  the  new  items  that  have  been  added.   For  instance,  we  are 
now  carrying  a  full  range  of  5%  type  RCR  resistors  in  addition  to  the  10% 
resistors  we  have  always  stocked.   We  hope  to  continue  our  trend  toward 
these  additions  so  that  we  can  more  completely  serve  your  needs. 

As  our  company  has  grown  and  the  number  of  orders  per  day  has  increased, 
it  has  become  necessary  to  request  that  certain  items  be  ordered  in  exact 
multiples  of  five  or  ten.   This  allows  us  to  prepackage  many  items  and 
process  each  order  with  greater  speed  and  accuracy.   We  ask  that  our  custo- 
mers pay  particular  attention  to  this  ordering  feature  as  this  will  save 
time  consuming  correspondence  for  both  of  us. 

Those  of  you  that  have  been  with  us  since  our  inception  will  be  familiar 

with  our  policy  of  24  hour  service  and  we  want  to  again  emphasize  that  we 
stress  this  policy  to  all  our  employees.   We  know  how  frustrating  long 
delays  can  be  when  you  are  waiting  for  your  order  and  we  have  built  our  re- 
putation on  FAST  SERVICE  and  the  stocking  of  only  FIRST  RUN,  FACTORY  TESTED 
COMPONENTS,   We  guarantee  to  replace  any  defective  items  if  you  will  call 
or  write  for  a  Return  Authorization, 

Other  features  to  note  are  our  Toll  Free  Lines  to  our  Order  Desk  (open  7  a.m, 
to  9  p.nw  Monday  through  Friday  and  8  a.m.  to  4  p.nu  on  Saturday)  and  our 
offer  of  free  data  sheets  for  all  our  integrated  circuits  and  readouts,   A 
special  column  on  the  order  blank  has  been  provided  for  this  request.   You 
will  also  notice  the  use  of  grouping  code  numbers  throughout  the  catalog. 
All  items  with  like  grouping  codes  may  be  combined  for  quantity  pricing. 

We  would  like  to  express  our  appreciation  to  those  of  you  who  have  continued 
to  support  us  and  offer  new  readers  an  invitation  to  try  our  parts  and  ser- 
vices.  We  are  getting  better  and  stronger  every  day. 

Sincerely, 


Lynette  Caskey 

General  Manager 


ORDER  DESK  (TOLL  FREE):  800-325-2595  &  800-325-2981 

MON.  -  FRI.       7  AM  -  9  PM        SAT.        8  AM  -  4  PM 


PRICES  SUBJECT  TO  CHANGE  WITHOUT  NOTICE 

©copYmGHT  wii,  solid  state  systems,  inc. 

PAINTED    IN  USA 


CERAMIC  DISC  CAPACITORS 


Sot  id  State  Systems  offers  a  complete  selection  of  Ceramic  Disc  Capacitors  for  a  wide  range  of  applications  from 
high  voltage  RF  to  low  voltage  transistor  Circuitry.  PLEASE  NOTE:  In  order  to  maintain  our  low  prices,  we 
must  request  that  you  order  in  exact  multiples  of  10  per  item;  you  may,  however,  mix  all  different  types  of 
ceramic  capacitors  for  quantity  pricing. 


Sprague  type  5HK  ceramic  disc  capacitors 
offer  high  capacity  in  a  minimum  space.  AM 
type  5HK  capacitors  have  a  tolerance  of 
-20%,  +80%.  Voltage  rating  is  1000WVDC 
for  values  up  to  and  including  0.01>jF;  and 
500WVDC  for  0,01 5juF  and  higher. 


Catalog 

Capaci- 

10- 

100- 

250- 

500- 

1000 

Grouping 

Number 

tance 

90 

240 

490 

990 

•up 

Code 

72-10369 

1000  pF 

.10 

.09 

.08 

.07 

.06 

4 

72-15369 

1500  pF 

.10 

.09 

.08 

.07 

.06 

4 

72-20369 

2000  pF 

.10 

.09 

.08 

.07 

.06 

4 

72-22369 

2200  pF 

.10 

.09 

.08 

.07 

.06 

4 

72-33369 

3300  pF 

.10 

.09 

.08 

.07 

.06 

4 

72-47369 

4700 pF 

.10 

.09 

.08 

.07 

.06 

4 

72-50369 

5000 pF 

.10 

.09 

.08 

.07 

.06 

4 

72-68369 

6800  p  F 

.10 

.09 

.08 

.07 

.06 

4 

72-10469 

0.010/iF 

.10 

.09 

.08 

.07 

.06 

4 

72-15463 

O.OIBjuF 

.10 

.09 

.08 

.07 

.06 

:            4 

72-20463 

D.020pF 

.11 

.10 

.09 

.08 

.07 

4 

72-25463 

0.025  pF 

.11 

.10 

.09 

.08 

.07 

4 

72-40463 

0.040  pF 

.20 

.18 

.16 

.14 

.12 

4 

72-50463 

0.050  pF 

.20 

.18 

.16 

.14 

.12 

4 

72-10563 

0.1  MF 

.35 

.32 

i 

.29 

.26 

.23 

4 

Sprague  type  TG  low  voltage  ceramic  disc 
capacitors  with  a  rating  of  10QWVDC  are 
ideal  for  use  in  transistorized  circuits.  All 
units  have  a  ±20%  tolerance. 


Catalog 

Capaci- 

10- 

100- 

250- 

500- 

1000 

Grouping 

Number 

tance 

90 

240 

490 

990 

-up 

Codes 

73-50342 

0.005  pF 

.10 

.09 

.08 

.07 

.06 

4 

73-10442 

0.01  juF 

.11 

.10 

.09 

.08 

.07 

4 

73-20442 

0.02/jF 

.11 

.10 

.09 

.08 

.07 

4 

73-25442 

0.025  ^F 

.12 

.11 

.10 

.09 

.08 

4 

73-30442 

0.03  juF 

.12 

.11 

.10 

.09 

.08 

4 

73-50442 

0.05  juF 

.20 

.18 

.16 

.14 

.12 

4 

73-10542 

0.1  ^F 

.26 

.23 

.20 

17 

.14 

4 

Central ab  type  UK  miniature  ceramic  discs 
offer  mint  mum  space  occupancy  on 
transistorized  boards  where  large  capacitance 
in  a  small  volume  is  required. 
Tolerance:  3WVDC  types,  guaranteed 
minimum  value;  aJI  others  -20%,  +80%. 


Catalog 

Capaci- 

lo- 

100- 

250-  500- 

1000 

Grouping 

Number 

tance 

go 

240 

490 

990 

-up 

Code 

84-10415 

.01,uF,16V 

.10 

.09 

.08 

.07 

.06 

4 

84-22421 

.022  mF,  25V 

.15 

.14 

.13 

.11 

.10 

4 

84-10509 

.1/uFJQV 

.12 

.11 

.10 

.09 

.08 

4 

84-20509 

.2/jF,  10V 

.20 

.18 

.16 

.14 

.12 

4 

8447503 

.47jiF,3V! 

.25 

.22 

.19 

.16 

.13 

4 

84-10603 

1.0mF,3V 

.25 

.22 

.19 

.16 

.13 

4 

84-22603 

2.2mF,3V 

.30 

.27 

.24 

.21 

.18 

4 

Sprague  type  5GA  ceramic  disc  capacitors 
have  low  self -inductance  of  silvered  flat-plate 
design  for  high  by-pass  efficiency.  All  type 
5GA  capacitors  have  a  tolerance  of  ±20%F 
and  1000WVDC  ratings. 


Catalog 
Number 

Capaci- 
tance 

lo- 
go 

100- 

240 

250- 

490 

500- 

990 

1000 

-up 

Grouping 

Code 

71-50069 
71-75069 
71-10169 
71-12169 
71-15169 

5pF 

7.5  pF 

10  pF 

12  pF 

15  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 

.06 
.06 
.06 
.06 

4 
4 
4 
4 

4 

71-20169 
71-22169 
71-25169 
71-27169 
71-30169 

20  pF 
22  pF 
25  pF 
27  pF 
30  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 

4 

71-33169 

71-39169 
71-50169 
71-56169 
71-68169 

33  pF 
39  pF 
50  pF 
56pF 
68  pF 

.10 
.10 
.10 
.10 

.  i  0 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 

4 
4 
4 

71-75169 
71-82169 
71-10269 
71-12269 
71-15269 

75  pF 

82  pF 

100  pF 

120pF 

150  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 
4 

71-18269 
71-20269 
71-22269 
71-25269 
71-27269 

180  pF 
200  pF 
220  pF 
250  pF 
270  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
,09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 
4 

71-30269 
71-33269 
71-36269 
71-39269 
7147269 

300  pF 
330  pF 
360  pF 
390  pF 
470  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 
4 

71-50269 
71-56269 
71-68269 
71-75269 
71-82269 

500  pF 
560  pF 
680  pF 
750  pF 
820  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 

.06 
.06 
.06 

4 

4 
4 
4 
4 

71-10369 
71-12369 
71-15369 
71-18369 
71-20369 

1000  pF 
1200  pF 
1500  pF 
1800 pF 
2D00pF 

.10 
.10 

.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 
4 

71-22369 
71-25369 
71-27369 
71-30369 
71-33369 

2200  pF 
2500  pF 
2700  pF 
300OpF 
3300  pF 

.10 
.10 
.10 
.10 
.10 

.09 
.09 
.09 
.09 
.09 

.08 
.08 
.08 
.08 
.08 

.07 
.07 
.07 
.07 
.07 

.06 
.06 
.06 
.06 
.06 

4 
4 
4 
4 
4 

71-39369 
7147369 
71-50369 
71-10469 
71-20469 

3900  pF 
4700  pF 
5000 pF 

0.01  £F 
0.02  ^F 

.10 
.10 
.10 

.11 

.12 

.09 
.09 
.09 
.10 
.11 

.08 
.08 
.08 
.09 

.10 

.07 
.07 
.07 
.08 
.09 

.06 

.06 
.06 

.07 
.08 

4 
4 
4 
4 
4 

§®y®  STATU  SYSTEMS*  Mt 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


ELECTROLYTIC  CAPACITORS 


These  aluminum  electrolytic  capacitors  offer  an  unexcelled  combination  of  high  performance,  high  stability,  low 
leakage  current  and  long  shelf  life  tn  a  package  ideally  suited  for  operation  in  coupling,  by-passing  and  filtering 
functions  with  typical  operating  life  of  10  years. 


PLEASE  NOTE:  In  order  to  keep  our  costs  at  minimum  and 
maintain  our  low  prices,  we  must  request  that  you  order  in 
EXACT  multiples  of  10  per  item.  However,  you  may  mix  all 
electrolytic  capacitors  for  quantity  pricing. 


* 

* 
* 


Operating  Temperature  Range:  -30  C  to  +85  C. 

Maximum  DC  Working  Voltage:  Rated  for  continuous  duty  at  85°C> 

Capacitance  Tolerance  Measured  at  120  Hz  and  25° C  Ambient 
Temperature;  -10%, +100%, 

*  Maximum  Leakage  Current:  According  to  formula: 

1  0uA)=O.Q2xC*V. 

*  Lead  Pull  Test:  Units  will  withstand  steady  pull  of  5  lbs.  (2,5  lbs.  for 
radial  leads}  applied  to  the  lead,  axially,  for  a  period  of  5  minutes.. 

*  Life  Test:  After  1000  hours  at  rated  voltage  and  temperature  of 
85PC,  the  capacitance  will  be  no  less  than  85%  nor  more  than  120% 
of  the  initial  value  and  leakage  current  will  not  exceed  the  maximum 
given  above. 


L+.03O 


KJL 


^D +.015 


***■ 


^_ 


S±  .015 


.250 
±.030 


L  ±  .030 


*>  D  ±   ,015  ^ 


j  h 


2.00  ±  .50 
(TYP,J 


PHYSICAL  DIMENSIONS  &  PRICE  LISTING 


AXIAL  LEADS 

RADIAL  LEADS 

Capaci- 
tance 

juFd 

Working 
DC 

Volts 

Surge 

DC 

Volts 

PRICE  EACH 

Catalog 

Dimensions 

Lead 
Dia. 

Catalog 
Number 

Dimensions 

Lead 
Dia. 

10- 
90 

100- 
240 

250- 
490 

500-' 
990 

1000 
-up 

Grouping 

Number 

"D" 

#ji  r# 

"D" 

fj|  rr 

"S" 

Code 

37-10609 
37-10621 
37-10633 
37-22609 
3722621 

.205 
.205 
.205 
.205 
.205 

0.488 
0.488 
0.488 
0488 
0.488 

.020 
.020 
.020 
.020 
.020 

38-10609 
38-10621 
38-10633 
38-22609 
38-22621 

.205 
.205 
.205 
.205 
.205 

0413 

0413 
0.413 
0413 
0413 

.079 
,079 

.079 
.079 
.079 

.020 
.020 
.020 
.020 
.020 

1 

1 

1 

2.2 

2.2 

10 

25 
50 
10 
25 

13 
32 

63 
13 
32 

.10 
.11 
.12 
.10 
.11 

.09 
.10 
.11 
.09 
.10 

.08 
.09 
.10 
.08 
.09 

.07 
.08 
.09 
.07 
.08 

.06 
.07 
.08 
.06 
.07 

5 
5 
5 

5 
5 

37-22633 
37-33609 
37-33621 
37-33633 
3747609 

.244 
.205 
.205 
.244 
.205 

0.492 
0438 
0.488 
0.492 
0488 

.024 
.020 
.020 
.024 
.020 

38-22633 
38-33609 
38-33621 
38-33633 
3847609 

.244 
.205 

.205 
.283 
.205 

0417 
0413 
0.413 
0.417 
0.413 

.098 
.079 
.079 
.098 
.079 

.020 
.020 
.020 
.020 
.020 

2.2 
3.3 
3.3 
3.3 

4.7 

50 
10 
25 
50 
10 

63 
13 
32 
63 
13 

.12 
.10 
.11 
.12 
.10 

.11 

.09 
.10 
.11 
.09 

.10 
.08 
.09 
.10 
.08 

.09 

.07 
.08 
.09 

!  -07 

.08 
.06 
.07 
.08 
.06 

5 

1       5 
5 
5 
5 

3747621 
3747633 
37-10709 
37-10721 
37-10733 

.205 
.323 
.205 
.244 
.323 

0.488 
0.622 
0.488 
0.492 
0.622 

.020 
.024 
.020 
.024 
.024 

3847621 
3847633 
38-10709 
38-10721 
38-10733 

.205 
.283 

.205 
.244 
.323 

0413 
0.417 

0.413 
0.417 
0.512 

.079 
.098 
.079 
.098 
.138 

.020 
.020 
.020 

.020 

.020 

4.7 

4.7 

10 

10 

10 

25 
50 

10 
25 

50 

32 
63 
13 
32 

63 

.11 
.12 
.10 
.11 
.12 

.10 
.11 
.09 
.10 

.11 

.09 
.10 
.08 
.09 
.10 

.08 
.09 
.07 
.08 
.09 

.07 

.08 
.06 
.07 
.08 

5 

5 
5 
5 
5 

37-22709 
37-22721 
37-22733 
37-33709 
37-33721 

.244 
.323 
.402 
.244 
.323 

0492 
0.622 
1.024 
0.492 
0.622 

.024 
.024 
.024 
.024 
.024 

38-22709 
38-22721 
38-22733 
38-33709 
38-33721 

.244 
.323 
402 
.244 
,323 

0417 
0.520 
0.768 
0.417 
0.520 

.098 
.118 
.197 
.098 
.118 

.020 
.020 
.024 
.020 
.020 

22 
22 
22 
33 
33 

10 
25 
50 
10 
25 

13 
32 

63 
13 

32 

.10 
.13 
.18 
.10 

.13 

.09 
.12 

.17 
.09 
.12 

.08 
.11 

.16 
.08 
.11 

.07 
.10 

.15 
.07 

.10 

.06 
.09 
.14 

.06 
.09 

5 
5 
5 
6 
5 

37-33733 
3747709 

.402 
.323 

1.024 
0.622 

.024 

[.024 

38-33733 
38-47709 

.402 

|.323 

0.787 
0.417 

.197 
.138 

.024 
.020 

33 

47 

50 

l    io 

63 
13 

.20 
.11 

.19 
.10 

.17 

.09 

.16 
.08 

.14 

.07 

5 
5 

P.O.  BOX  773 


SOI!!®  STAT!  STOVBMS,  INC.  Columbia,  Missouri  65201 


AXIAL  LEADS 

RADIAL  LEADS 

Capaci- 
tance 

f/Fd 

Working 
DC 

Volts 

Surge 

DC 

Volts 

PRICE  EACH 

~* 

Catalog 

Dimensions 

Lead 
Dia. 

Catalog 
Number 

Dimensions 

L  630 

Dia. 

lo- 
go 

100 
240 

250- 
490 

500- 
990 

1000 
-up 

Grouping 

Number 

"n» 

"I" 

"D" 

"L" 

"S" 

Code 

3747721 

402 

1.004 

.024 

3847721 

402 

0.512 

.197 

.020 

47 

25 

32 

.15 

.14 

.13 

.12 

.11 

5 

3747733 

.520 

1.240 

.031 

3847733 

.520 

0.807 

.236 

.024 

47 

50 

63 

.19 

.18 

.17 

.16 

.14 

5 

37-10809 

.323 

0.622 

.024 

38-10809 

.323 

0.512 

.  1 38 

.020 

100 

10 

13 

.12 

.11 

.10 

.09 

.08 

5 

37-10821 

402 

1.004 

.024 

38-10821 

.402 

0.787 

.197 

.024 

100 

25 

32 

.18 

.17 

.16 

.15 

.14 

5 

37-10833 

.520 

1.240 

.031 

38-10833 

.520 

1.240 

.236 

.031 

100 

50 

63 

.27 

.25 

.23 

.21 

.19 

5 

37-15809 

402 

1.004 

.024 

38-15809 

402 

0.524 

.197 

.020 

150 

10 

13 

.17 

.16 

.15 

.14 

.13 

5 

37-15821 

.402 

1.024 

.024 

38-15821 

.520 

0.787 

.236 

.024 

150 

25 

32 

.24 

2Z 

.21 

.20 

.18 

5 

37-15833 

.638 

1.260 

.031 

38-15833 

.638 

1.260 

.295 

,031 

150 

50 

63 

.36 

.34 

.32 

.30 

28 

5 

37-22809 

.402 

1.004 

.024 

38-22809 

.402 

0.571 

.197 

.024 

220 

10 

13 

.13 

.12 

.11 

.10 

.09 

5 

37-22821 

.520 

1.240 

.031 

38-22821 

.520 

0.807 

.236 

.024 

220 

25 

32 

.25 

.24 

.22 

.21 

.19 

5 

37-22833 

.717 

1.240 

.031 

38-22833 

.638 

1.555 

.295 

.031 

220 

50 

63 

.37 

iu3 

.32 

.30 

.27 

5 

37-33809 

402 

1.004 

.024 

38-33809 

.402 

0.768 

.197 

.024 

330 

10 

13 

.20 

.19 

.18 

.17 

.16 

5 

37-33821 

.520 

1.240 

.031 

38-33821 

.520 

1.240 

.236 

.031 

330 

25 

32 

.26 

.24 

.22 

.20 

.18 

5 

37-33833 

.717 

1.811 

.031 

38-33833 

.717 

1.772 

.295 

.031 

330 

50 

63 

.54 

.50 

.46 

.42 

.38 

5 

3747809 

402 

1.004 

.024 

3847809 

.402 

0.768 

.197 

.024 

470 

10 

13 

.24 

.23 

.21 

.20 

.18 

5 

3747815 

.520 

1.240 

.031 

3847815 

.520 

0.984 

.236 

.031 

470 

16 

20 

.25 

.24 

.22 

.21 

.19 

5 

3747821 

.638 

1.240 

.031 

3847821 

.630 

0.984 

.296 

.031 

470 

25 

32 

.26 

.24 

.22 

.20 

.18 

5 

3747827 

.717 

1.240 

.031 

3847827 

.638 

1.555 

.295 

.031 

470 

35 

44 

.35 

.33 

.31 

.29 

21 

5 

3747833 

.717 

1.949 

.031 

3847833 

.717 

1.909 

.295 

.031 

470 

50 

63 

.64 

.60 

.55 

.51 

.46 

5 

37-68809 

.520 

1.240 

.031 

38-68809 

.520 

1.004 

.236 

.031 

680 

10 

13 

.31 

.29 

.27 

.25 

.23 

5 

37-68821 

.717 

1.260 

.031 

38-68821 

,U  JO 

1.575 

.295 

.031 

680 

25 

32 

.42 

.39 

.36 

.33 

.30 

5 

37-10909 

.520 

1.240 

.031 

38-10909 

.638 

1.004 

.295 

.031 

1000 

10 

13 

.41 

.38 

.35 

.32 

.29 

5 

37-10915 

.638 

1.240 

.031 

38-10915 

.638 

1.260 

.295 

.031' 

1000 

16 

20 

.45 

42 

.39 

.36 

.33 

5 

37-10921 

.717 

1.437 

.031 

38-10921 

.717 

1 .398 

.295 

.031 

1000 

25 

32 

.50 

47 

,43 

40 

.37 

5 

37-10927 

.717 

1.949 

.031 

38-10927 

.717 

1.969 

.295 

.031 

1000 

35 

44 

.67 

.63 

.58 

.54 

.49 

5 

37-15915 

.717 

1.457 

.031 

38-15915 

.638 

1.575 

.295 

.031 

1500 

16 

20 

.42 

.39 

.36 

.33 

.30 

5 

37-22915 

.717 

1.594 

.031 

38-22915 

.717 

1.752 

.295 

.031 

2200 

16 

20 

.56 

.53 

49 

46 

42 

5 

TRANSFORMERS 

Three  Stancor  filament  transformers  are  now  available  for  a  variety  of  power 
supply  circuit  applications.  All  three  have  117  volts,  50/60  Hz  primaries  and 
center-tapped  secondaries  with  lead  terminations.  All  secondary  voltages 
±3%.  Units  designed  and  built  to  meet  the  requirements  of  El  A  for  electrical 
tolerances,  dielectric  strength,  temperature  rise  and  construction.  All  are 
insulated  with  class  A  materials;  (105° C  maximum  operating  temperatures)* 

DIMENSIONS  &  PRICE  LISTING 


Catalog 

Stancor 
Part  Number 

Secondary 

Dimensions 

Wt. 
Lbs. 

1- 
49 

50- 
99 

100- 
499 

500- 
999 

1000- 
up 

Grouping 

Number 

Volts 

Amps 

H 

W 

D 

rain 

Code 

1106134 
1 1-08384 

11-08180 

I      P-6134 
P-8384 

P-8180 

6.3 
12.6 
25.2 

1.2 
1.0 
1.0 

iy8 

2 

2      i 

2% 
3 'A 
3 'A 

1% 
IV* 
2Ve 

2y« 

2'?i« 

0.8 
0.9 

1.4 

3.00 
3.25 
3.25 

2.75 
3.00 
3.00 

2.50 
2.75 
2.75 

2.00 
2.25 
2.25 

1.50 
1.75 
1.75 

7 

7 
7 

P  0  BOX  773 

mm  S?a?g  §Y§7SM§fl  QMC  Columbia,  Missouri  65201 


RESISTORS 


Solid  State  Systems  presents  standard  5%  and  10%  tolerance 

Stack  pole  &  Allen-Bradley  type  RGR  hot  molded  fixed 
composition  resistors  which  meet  all  requirements  of 
MIL-R-39008.  These  resistors  have  established  reliability  to 
0,001%  failure  rate  per  1000  hours  of  operation  at  maximum 
amhient  temperature  of  70°C  as  symbolized  by  the  filth  color 
band  on  the  body  of  the  resistor. 

*  Maximum  Ambient  Operating  Temperature:  7Q°C, 

+    Available   Values:  All   84  standard    10%,  and   all   167 
standard  5%  values  from  2J£2  to  22AM2, 

*  Unexcelled  low  noise  characteristics. 

*  Utmost    uniformity    in    dimensions   due   to    exclusive 
molding  process, 

*  All  leads  tin  plated  to  meet  MIL-STD-202,  Method  208 
requirements. 

*  Permanent  color  codes  which  are  immune  to  scrubbing 
with  all  commercial  I  v  used  flux  solvents. 

Within  the  limitations  shown  in  price  table  below,  all  values  of  V* 
and  Vs  watt  resistors  may  be  combined  for  quantity  pricing.  All 
Resistors  must  be  ordered  in  exact  multiples  of  5  per  value. 


Multiples  of 

Multiples  of 

Multiples  of 

Catalog  Number 

5  Per  Value 

50  Per  Value 

1000  Per  Value 

Grouping 

5& 

50 

1000 

1000- 

10,000 

Cade 

up 

950 

&  up 

0000 

&  up 

From  Table  1 

.05 

,040 

.035 

.03 

.025 

3 

From  Table  II 

,08 

.065 

.055 

.045 

.040 

3 

COLOR 

FIRST  | 
DIGIT 

SEDOND 
DIGIT 

MULTI- 
PLIER 

TOLERANCE 

RELIABILITY 
LEVEL* 

Silver 

*  - 

«...,. 

±1Q^ 

Gold 

-  - 

0,1 

15% 

*  *  ~  *  •  * 

Black 

0 

O 

1 

.... 

Brown 

1 

1 

TO 

•B        * 

1% 

Red 

a 

2 

100 

a-    i> 

0.1% 

Orange 

3 

3 

1400O 

0.01% 

Yallo^v 

4 

4 

10,000 

.  ,  ,  _ 

0.001% 

Green 

5 

6 

100,000 

r-  ■    *   a 

Blue 

6 

e 

1,000,000 

.  .  .  _ 

Vitilet 

7 

7 

.  «  .  *  .,  i  .  . 

»    m    -m    m 

----** 

Gr,iv 

8 

B 

White 

9 

9 

_    _    J.    m 

*  RELIABILITY  LEVEL:  Percent  failure  per  lOOO  hrs. 


n 


D 


k 


T 


~§~ 


Wattage 

Dimension 

In  Inches 

A 

B 

C 

D 

% 

0.250=0.015 

0.090x0.008 

1,500*0.125  O.025±0.0O2 

% 

0.375=0.031 

0.140±0.Q08 

1,500.-0.125  Q.Q33±0.002 

TABLE    t:     STANDARD   10%  VALUES 

AND  CATALOG   NUMBERS 

Resis- 
tance 

Catalog  Number 

Resis- 
tance 

— i 

Resis- 
tance 

Catalog  Number 

Resis- 
tance 

Catalog  Number 

XWatt 

XWatt 

XWatt 

%  Watt 

%  Watt 

'A  Watt 

V*  Watt 

X  Watt 

100 

11-10207 

12-10220 

10K 

11-10407 

12-10420 

1.0M 

11-10607 

12-10620 

120 

11-12207 

12-12220 

12K 

11-12407 

12-12420 

1.2M 

11-12607 

12-12620 

150 

11-15207 

12-15220 

15K 

11-15407 

12  15420 

1.5M 

11-15807 

12-15620 

180 

11-18207 

12-18220 

18K 

11-18407 

12-18420 

1.8M 

11-18607 

12-18620 

220 

11-22207 

12-22220 

22K 

11-22407 

12-22420 

2.2M 

1 1  -22607 

12-22620 

2.7 

11-27007 

12-27020 

270 

11-27207 

12-27220 

27  K 

11-27407 

1 2-27420 

2.7M 

11-27607 

12-27620 

M*0 

11-33007 

12-33020 

330 

11-33207 

12  33220 

33K 

11-33407 

1 2-33420 

3.3M 

1 1  -33607 

12-33620 

3.9 

1 1-39007 

12-39020 

390 

11-39207 

12-39220 

39  K 

1 1-39407 

12-39420 

3.9M 

11-39607 

12-39620 

4.7 

1 147007 

12-47020 

470 

1147207 

1 247220 

47K 

1 1  -47407 

1247420 

4.7M 

1147607 

1247620 

5.6 

11-56007 

12-56020 

560 

11-56207 

12-56220 

56K 

1 1  -56407 

12-56420 

5.6NI 

11-56607 

12-56620 

6.8 

1 1-68007 

12  68020 

680 

11-68207 

1 2-68220 

68  K 

1 1  -68407 

12-68420 

6.8MI 

11-68607 

12  68620 

8.2 

11-82007 

12-82020 

820 

11-82207 

1 2-82220 

82  K 

11-82407 

12-82420 

8.2M 

11-82607 

12-82620 

10 

11-10107 

1210120 

1000 

11-10307 

12-10320 

100K 

11-10507 

12-10520 

1QM 

11-10707 

12-10720 

12 

11-12107 

1212120 

1200 

11-12307 

12-12320 

120K 

11-12507 

12-12520 

12M 

11-12707 

12-12720 

15 

11-15107 

12-15120 

1500 

11-15307 

12-15320 

150K 

11-15507 

12-15520 

15M 

11-15707 

12-15720 

18 

11-18107 

12-18120 

1800 

11-18307 

12-18320 

180K 

11-18507 

12-18520 

ISM 

11-18707 

12-18720 

22 

11-22107 

12-22120 

2200 

11-22307 

12-22320 

220K 

1122  507 

12-22520 

22M 

11-22707 

12-22720 

27 

11-27107 

12-27120 

2700 

1127307 

12-27320 

270K 

11-27507 

12-27520 

33 

11-33107 

12-33120 

3300 

1 1  -33307 

12-33320 

330K 

1 1  -33507 

12-33520 

39 

11-39107 

12-39120 

3900 

11-39307 

12-39320 

39  OK 

11-39607 

12-39520 

47 

11-47107 

12-47120 

4700 

1147307 

1247320 

470K 

1 1 47507 

1247520 

56 

1 1-58107 

12-56120 

5600 

1 1-56307 

12-56320 

560K 

1 1  -56507 

12-56520 

68 

11-68107 

12-68120 

6800 

11-68307 

12-68320 

680  K 

11-68507 

12-68520 

82 

11-82107 

12-82120 

8200 

11-82307 

12-82320 

820K 

11-82507 

12-82520 

P  0  BOX  773 

®UD  STAVE  SYSISMS,  INC.  Columbia.  Missouri  05201 


TABLE   II:    STANDARD  5%  VALUES  AND  CATALOG  NUMBERS 


Resis- 
tance 

Catalog  Number 

Resis- 
tance 

Catalog 

Number 

Resis- 
tance 

Catalog  Number 

Resis- 
tance 

Catalog  Number 

KWatt   |    14  Watt 

!4Watt 

Vi  Watt 

V*  Watt 

Vz  Watt 

%  Watt 

Yz  Watt 

100 

13-10207 

14-10220 

10K 

13-10407 

14-10420 

1.0M 

13-10607 

14-10620 

110 

13-11207 

14-11220 

11K 

13-11407 

14-11420 

1.1M 

13-11607 

14-11620 

120 

13-12207 

14-12220 

12K 

13-12407 

14-12420 

1.2M 

13-12607 

14-12620 

130 

13-13207 

14-13220 

13K 

13-13407 

14-13420 

1.3M 

13-13607 

14-13620 

150 

13-15207 

14-15220 

15K 

13-15407 

14-15420 

1.5M 

13-15607 

1415620 

160 

13-16207 

14-16220 

16K 

13-16407 

1416420 

1.6M 

13-16607 

14-16620 

180 

13-18207 

14-18220 

18K 

13-18407 

1418420 

1.8M 

13-18607 

14-13620 

200 

13-20207 

1420220 

20K 

13-20407 

14-20420 

2.0M 

13  20607 

14-20620 

220 

13-22207 

14-22220 

22  K 

13-22407 

14-22420 

2.2M 

13-22607 

1422620 

240 

13-24207 

14-24220 

24K 

13-24407 

14-24420 

2.4M 

13-24607 



14-24620 

2.7 

13-27007 

14-27020 

270 

13-27207 

1427220 

27  K 

13-27407 

14-27420 

2.7M 

13-27607 

14-27620 

3.0 

1 3-30007 

14-30020 

300 

13-30207 

14-30220 

30K 

13-30407 

1430420 

3. DM 

13-30607 

14-30820 

3.3 

T  3  33007 

14-33020 

330 

13-33207 

1433220 

33K 

13-33407 

1433420 

3.3M 

13-33607 

14-33620 

3.6 

13-36007 

14-36020 

360 

1 336207 

1436220 

36K 

13-36407 

14-36420 

3.6WI 

13-36607 

14-36620 

3.9 

1 3-39007 

14-39020 

390 

13-39207 

14  39220 

39  K 

13-39407 

14-39420 

3.9M 

13-39607 

1439620 

4.3 

1 343007 

1443020 

430 

13-43207 

1443220 

43  K 

1343407 

1443420 

4.3M 

1343607 

1443620 

4.7 

1347007 

1447020 

470 

1347207 

1447220 

47  K 

1347407 

1447420 

4.7M 

1347607 

1 447  620 

5.1 

13-51007 

14-51020 

510 

13-51207 

14-51220 

51K 

13-51407 

14-51420 

5.1M 

13-51607 

14-51620 

5.6 

13-56007 

14-56020 

560 

13-56207 

14-56220 

56K 

13-56407 

14-56420 

5.6M 

13-56607 

14  56620 

6.2 

13-62007 

14-62020 

620 

13-62207 

14-62220 

62K 

13-62407 

1462420 

6.2W1 

13-62607 

14-62620 

6.8 

13-68007 

1 4-68020 

680 

13-68207 

14-68220 

68K 

13-68407 

14-68420 

6.8N1 

13-68607 

1468620 

7.5 

13-75007 

14-75020 

750 

13-75207 

14-75220 

75K 

13-75407 

14-75420 

7.5M 

13-75607 

14-75620 

8.2 

1 3-82007 

14-82020 

820 

13-82207 

14-82220 

82  K 

13-82407 

1482420 

8.2M 

13-82607 

1482620 

9.1 

13-91007 

14-91020 

910 

13-91207 

14-91220 

91K 

13-91407 

1491420 

9.1M 

13-91607 

14-91620 

10 

13-10107 

14-10120 

1000 

13-10307 

14-10320 

100K 

13-10507 

14-10620 

10M 

13-10707 

14-10720 

11 

13-11107 

14-11120 

1100 

13-11307 

1411320 

110K 

13-11507 

14-11520 

11M 

13-11707 

14-11720 

12 

13-12107 

14-12120 

1200 

13-12307 

14-12320 

120K 

13-12507 

14-12520 

12M 

13-12707 

14-12720 

13 

13-13107 

14-13120 

1300 

13-13307 

14-13320 

130K 

13-13507 

14-13520 

13M 

13-13707 

14-13720 

15 

13-15107 

14-15120 

1500 

13-15307 

14-15320 

150K 

13-15507 

14-15520 

15M 

13-15707 

14-15720 

16 

13-16107 

14-16120 

1600 

13-16307 

14-16320 

160K 

13-16507 

14-16520 

16M 

13-16707 

14-16720 

18 

13-18107 

14-18120 

1800 

13-18307 

14-18320 

180K 

13-18507 

14-18520 

18M 

13-18707 

1418720 

20 

13-20107 

14-20120 

2000 

1 3-20307 

14-20320 

200K 

13-20507 

14-20520 

20M 

13-20707 

14-20720 

22 

13-22107 

14-22120 

2200 

1 3-22307 

14-22320 

220K 

13-22507 

14-22520 

22M 

13-22707 

14-22720 

24 

13-24107 

14-24120 

2400 

1324307 

1424320 

240K 

13-24507 

14-24520 

27 

13-27107 

14-27120 

270D 

13-27307 

14-27320 

270K 

13-27507 

14-27520 

30 

1330107 

14-30120 

3000 

13-30307 

1430320 

300  K 

13-30507 

1430520 

33 

13-33107 

14-33120 

3300 

1 3-33307 

1433320 

330K 

13-33507 

1433520 

36 

13-36107 

14-36120 

3600 

1336307 

1436320 

360K 

13-36507 

14-36520 

m3 

1339107 

14-39120 

3900 

13-39307 

14-39320 

390  K 

13-39507 

14-39520 

43 

1343107 

1443120 

4300 

1 343307 

1443320 

430  K 

1343507 

1443520 



47 

1347107 

1447120 

4700 

1 347307 

1447320 

470  K 

1347507 

1447520 

51 

1351107 

14-51120 

5100 

13-51307 

14-51320 

510K 

13-51507 

14-51520 

56 

1356107 

14-56120 

5600 

1 3-56307 

1456320 

560K 

13-56507 

1456520 

1     62 

1362107 

14-62120 

6200 

13-623D7 

14-62320 

620K 

13-62507 

14-62520 

;     68 

1368107 

14-68120 

6800 

13-68307 

1468320 

680  K 

13-68507 

1468520 

75 

13-75107 

14-75120 

7500 

13-75307 

1475320 

750K 

13-75507 

14-75520 

1     82 

1362107 

14-82120 

8200 

13-82307 

1462320 

820K 

13-82507 

14  82520 

I     91 

13-91107 

14-91120 

9100 

13-91307 

1491320 

910K 

13  91507 

14-91520 

P.O.BOX  773 

SOLID  STAVi  SVSTOMS,  INC.  Columbia.  Missouri  65201 


DUAL-IN-LINE  IC  SOCKETS 


Solid  State  Systems  now  offers  you  the  most  complete  line  of  Dual-ln-Lrne  integrated  circuit  sockets  from  such 
leaders  as  Cambion®,  and  Micro  Plastic,  Inc.  Virtually  every  combination  of  Tin  or  Gold  plated,  Solder  or 
Wire-Wrap  type  in  both  glass-filled  Nylon  or  Diallylptalate  for  IC's  from  6-*  to  40— pins  is  now  available  from  a 
single  source,  As  it  is  our  policy,  you  may  of  course,  combine  different  sockets  with  the  same  grouping  code  to 
obtain  quantity  pricing. 

SOCKET  SPECIFICATIONS: 

Sockets  keyed  "Diallyl"  in  table  on  following  page  have  body  material  of  fiberglass-reinforced  Diallylptalate  usable  over  -50°C  to 
125°C  temperature  range.  Sockets  keyed  "Nylon"  have  body  material  of  glass-reinforced  Nylon  usable  overO°C  to  75UC  temperature 
range, 

All  contact  materials  are  phosphor  bronze,  All  tin  plated  pins  have  a  minimum  of  300  micro-inches  of  electro  deposited  tin  and  all 
gold  plated  pins  have  a  minimum  of  20  micro-inches  of  hard  gold  over  nickel  or  copper. 


Sockets  starting  with  catalog  numbers  31-  are  high  density  type  mountable  on  0.1"  separation,  all  others  must  have  0.2"  separation 
between  adjacent  sockets,  All  sockets  have  built-in  closed-entry  caps  except  types  starting  with  catalog  numbers  3K  Separate  nylon 
closed-entry  caps  for  these  are  available  as  listed  below: 


Catalog 

Number 
Df  Pins 

Color 

Unit  Price 

Grouping 

Number 

5-95 

100-995        | 

1000  up 

Code 

31-03014 
31-03016 

14 
16 

Black 
White 

.05 
.05 

.04 
.04 

.03 
.03 

8 
8 

PLEASE  NOTE:    Figures  1-10  below  provide  physical  dimensions  for  available  sockets.  When  selecting  socket  to  fit 
your  specifications,  consult  column  labled  FIGURES  at  top  of  table  on  following  page. 


.255" 


1 T 


.650" 


■  _.026" 
SCL  TYP. 


Fig.  1 


i 

.255" 

T    ■ 
•  153" 


i r 


.025" 
TYP 


Fig,  2 


i_ 

.163" 
I 


1 


Xt: 


.270' 


U    .0251' 
TYP, 


,tSO"  *■     -*   - 


134-1 


(OOTYP- 


r 
XL 


490 


1~ 
3O0 


074 


Hhb.^r* 


>y ' 


ff  ? 


MOU 


ISO 

"T 


Fig,  3 


Fig.  4 


KWTYp 


7 


434  — i 


*?° 


r 

500 

J 


i 


m 


-0?4 

-  Oft*  DUL 

i-HOLE 


ISO 


Fig-  5 


- 


-^   —cott*  —    - 


4'>0j 


T        I         ,         .         ,1 


094  a*. 


J'1!1    t 


I .9»— Il?»*    14* 

Fig.  6 


ISO 


1 


ax 


300 


430   1 


934- 

coryp 


a 


^,074 


t        *  111*11 


m  m  k  bh  h  m  jU^j"^^ 


O  O  or 


MR 

ami 


nBBRH 

It         ij  I*         ■■}         l| 


ten 


-  .500 — -I  Z24 

Fig.  7 


I 


ISO 


'  Li  *   >   mim  i   '  ■ 
C&RRHAHICfCBE 


1  Bin  n  n  n.  n.  n.  r.  r,  e.   /— 

1 — ~ r i^r~i 

*>T      Q     o     cf   * 

- «» — — I    Li 


—  MO 

ov4  a*. 

T  HOLES 

Z24 

J 


Fig,  8 


i 


i h"  —  Hh*— ' : 


Fig.9 


074-  DlA_  MOU  19  PH«i»l  Smr 
063*  Di*  HOLE 


CWlflE  WftAPt 


(WIRE  WRAP}  WX.OEW  Dirj 

*—  Mf  m  sag-  csolqer  om 


Fig.  10 


P  D  BOX  773 

OUD  SVA1TS  SYSTEMS,  DMC.  Columbia.  Missouri  65201 


PLK  \SE  NOTE:    \hw  to  our  method  of  packaging,  all  sockets  must  be  ordered  in  multiples  of  5  per  item* 


Catalog 

Number 
of  Pins 

Color 

Pin 
Plating 

Material 

Type 

Figures 

Unit  Price 

Grouping 

Number 

545 

50-95 

100495 

500-995 

1000-up 

Code 

41-37714 

6 

Blue 

Tin 

D  tally  1 

Solder-Tab 

2.4 

.29 

.26 

21 

.19 

.16 

6 

41-37713 

6 

Blue 

Gold 

DiaElyl 

Solder-Tab 

2,4 

.32 

28 

.24 

.21 

.17 

6 

41-38814 

6 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,4 

.34 

.30 

.26 

.23 

.19 

6 

41-38813 

6 

Blue 

Gold 

DiaMyl 

Wire-Wrap 

1,4 

.37 

.33 

.28 

.24 

.20 

6 

41-37724 

8 

Blue 

Tin 

Diallyl 

Solder-Tab 

2,5 

.32 

.28 

.24 

.21 

.17 

6 

41-37723 

8 

Blue 

Gold 

DiaMyl 

Solder-Tab 

2,5 

.34 

.30 

.26 

.23 

.19 

6 

41-38824 

8 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,5 

.29 

.26 

.22 

.19 

.16 

6 

41-38823 

8 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.5 

.32 

2A 

24 

.21 

.17 

6 

41-37774 

14     j 

Red 

Tin 

Nylon 

Solder-Tab 

3,6 

.32 

.28 

24 

21 

.17 

6 

41-37773 

14 

Red 

Gold 

Nylon 

Solder-Tab 

3,6 

.37 

.33 

.28 

24 

20 

6 

31-01014 

14 

Black 

Gold 

Nylon 

Solder-Tab 

10 

.43 

.38 

.33 

28 

23 

6 

41-37884 

14 

Blue 

Tin 

Diallyl 

Solder-Tab 

2.6 

.52 

.46 

.40 

.34 

28 

6 

41-37883 

14 

Blue 

Gold 

Dialfyl 

Solder-Tab 

2,6 

.60 

.53 

.46 

.40 

.33 

6 

31-02014 

14 

Black 

Gold 

Nylon 

Wire-Wrap 

10 

.53 

.47 

.41 

.35 

.29 

6 

41-38974 

14 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,6 

.52 

.46 

.40 

.34 

28 

6 

41-38973 

14 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1,6 

.55 

.49 

.42 

.36 

.30 

6 

41-37784 

16 

Red 

Tin 

Nylon 

Solder-Tab 

3.6 

.34 

.30 

.26 

23 

.19 

6 

41-37783 

16 

Red 

Gold 

Nylon 

Solder -Tab 

3.6 

.41 

.36 

.31 

27 

22 

6 

31-01016 

16 

White 

Gold 

Nylon 

Solder-Tab 

10 

.49 

.43 

.37 

.32 

26 

6 

41-37894 

16 

Blue 
Blue 

Tin 

Diallyl 

Solder-Tab 

2,6 

.52 

.46 

.40 

ijH" 

28 

6 

41-37893 

16 

Gold 

Diallyl 

Solder-Tab 

2,6 

.60 

.53 

.46 

.40 

.33 

6 

31  02016 

16 

White 

Gold 

Nylon 

Wire-Wrap 

10 

.58 

.52 

.45 

.38 

.32 

6 

41-38984 

16 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,6 

.55 

iHD 

.42 

.36 

.30 

6 

41-38983 

16 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.6 

.60 

.53 

.46 

.40 

.33 

6 

41-37874 

18 

Blue 

Tin 

Diallyl 

Solder-Tab 

2,7 

.60 

.53 

.46 

.40 

.33 

6 

41-37873 

18 

Blue 

Gold 

Diallyl 

Solder-Tab 

2,7 

.65 

.58 

.50 

.43 

,oO 

6 

41-38954 

18 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1.7 

.81 

.72 

.62 

.53 

.44 

6 

41-38953 

18 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.2 

.94 

.83 

.72 

.62 

.51 

6 

41-37854 

22 

Blue 

Tin 

Diallyl 

Solder-Tab 

2,8 

.65 

.58 

.50 

.43 

.35 

6 

41-37853 

22 

Blue 

Gold 

Diallyl 

Solder  Tab 

2,8 

.71 

.63 

.54 

.46 

.38 

6 

41-38924 

22 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1.8 

1.17 

1.04 

30 

.77 

♦63 

6 

41-38923 

22 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1,8 

1.30 

1.15 

1.00 

.85 

.70 

6 

41-51534 

24 

Red 

Tin 

Nylon 

Solder-Tab 

3.9 

1.25 

1.11 

.96 

.82 

.68 

6 

41-51533 

24 

Red 

Gold 

Nylon 

SolderTab 

3,9 

1.38 

122 

1.06 

.91 

.75 

6 

41-37904 

24 

Blue 

Tin 

Diallyl 

SolderTab 

2,9 

1.25 

1.11 

,96 

.82 

.68 

6 

41-37903 

24 

Blue 

Gold 

Diallyl 

Solder-Tab 

2,9 

1.38 

1.22 

1.06 

.91 

.75 

6 

41-38964 

24 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,9 

1.33 

1.18 

1.02 

.87 

.72 

6 

41-38963 

24 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.9 

1.46 

1.29 

1.12 

.96 

.79 

6 

41-37834 

28 

Blue 

Tin 

Diallyl 

SolderTab 

2,9 

1.98 

1.75 

1.52 

1.30 

1.07 

6 

41-37833 

28 

Blue 

Gold 

Diallyl 

Solder-Tab 

2,9 

227 

2.01 

1.74 

1.48 

122 

6 

41-38904 

28 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1.9 

1.43 

127 

1.10 

.94 

.77 

6 

41-38903 

28 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.9 

1.56 

1.38 

120 

1.02 

.84 

6 

41-37914 

36 

Blue 

Tin 

Diallyl 

SolderTab 

2.9 

221 

1.96 

1.70 

1.45 

1.19 

6 

41-37913 

36 

Blue 

Gold 

Diallyl 

Solder-Tab 

2,9 

2.47 

2.19 

1.90 

1.62 

1.33 

6 

41-38934 

36 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1.9 

2.21 

136 

1.70 

1.45 

1.19 

6 

41-38933 

36 

i 1 

Blue 

Gold 

Diallyl 

Wire-Wrap 

1.9 

2.47 

2.19 

1.90 

1.62 

1.33 

6 

41-37664 

40 

Blue 

Tin 

Diallyl 

Solder-Tab 

2,9 

1.20 

1.06 

.92 

.79 

.65 

6 

41-37663 

40 

Blue 

Gold 

Diallyl 

Solder-Tab 

2,9 

1.30 

1.15 

1.00 

.85 

.70 

6 

41-38854 

40 

Blue 

Tin 

Diallyl 

Wire-Wrap 

1,9 

1.20 

1.06 

.92 

.79 

.65 

6 

41-38853 

40 

Blue 

Gold 

Dialfyl 

Wire-Wrap 

1,9 

1.30 

1.15 

1.00 

.85 

.70 

6 

P  D   BOX  773 
§®U®  I7A?I  §Y§17IM§fl  3MC    COLUMBIA,  MISSOURI    65201 


READOUTS 


A  wide  choice  of  7-segment  and  ±1  overflow  Incandescent  and  LED  Readouts  are  now  available  from  Solid  State 
Systems  for  practically  any  type  of  application,  PLEASE  NOTE:  All  displays  may  be  combined  for  quantity 
pricing. 

INCANDESCENT  DISPLAYS 


The  Series  90  MINITRQN®  readout  is  a  miniature  direct 
viewed  incandescent  filament  display,  housed  in  a  standard 
metal  16-pin  dual-in-line  package  with  a  hermetically  sealed 
front  lens.  These  units  operate  from  S  volt  TTL  supply  and  are 
fully  compatible  with  TTL  decoder  driver,  7447,  without  the 
need  for  any  external  current  limiting  resistors.  The  current 
drain  at  5VDC  is  only  8mA  per  segment  with  a  design  life  of 
50,000  hours,  Due  to  white-light  characteristics  of  this  display, 
filtering  by  means  of  virtually  any  color  is  possible  without 
sacrificing  sharpness  of  the  character  displayed. 

SEE  NEXT  PAGE  FOR  PRICING  INFORMATION 


-.i 


<i—4 


*ai 


.j§ 


.J4  ^ 


12 


PI' 


I 


VJ 


H 


': 


J  .w  U 


Hcc«2tfnetjd*d  operating  trainee 
CurreTit  per  *e£mrnl    ...... 

Life  expectancy  .,,,,,,.« 

Viewing  qjifir  4  Included  angiel    . 
Temperature  range  *  ♦ 

LCTI  B      T        ■         4         4  I         I 

Filament*  *    ■    ■ 


■      ■      «      fl      fa      ■      ■      m 


4.  5  re  «.  iV 

M,  000  hDurft  #  IV DC 

-JO&C  to*T0°C 
Boro&ihcmc  fl«U 
Tung  aim 


LED  DISPLAYS 

Figures    1    through    8   below    provide    physical    characteristics    of    all    LED   displays.   Optical    and   Electrical 
characteristics  are  listed  for  all  LED'son  following  page  as  is  pricing  information  on  all  displays. 


r 


T 


T 


L»-   4H   — *j 


I 1*1 

I ml* 


-H  «•   h- 


SLA -1  &  7 


j*»  «pq— *| 


SLA-1C 


\*-~  *aa  — *-| 


1 


j    m 

irrT 


I     -4 


H      (4 


c    " 


MS 


hQ**- 


ao 


n  iT 


c 


V_nfTrT 


/  / 
/. 


X 


T 

OFT 

1 


Bill  •«  4lt 


•  Jl< 


SLA-2  &  9 


1 


SLA-3 


'T 


■.■■«  Cjw*  Irt'T 


4      • 


'       ' 


I 
1 


SLA-4 


OftlfNtATrDN 
MAMRf 

PIN    14 


SLA-10A 


J        £       MAIM 


omtMf«,tn3n 


±J 


•JL 


ID 


-CX 


CO 


Q  JO 


I 


1 


^l — D" 


SLA-101A 


l>« 


(T31 


3 — 

<= 

»l 

1* 

•  ? 

M 

id* 

■  1 

•1 

11 

n* 

•rl 

*e 

tj 

C 

S  J» 


u 


a  oi 


-A     P— o  ■< 


DL-704  &  FDL-7 


»^  P.O.  BOX  773 

S@U®  SIF&iril  STfSTSQbHS.  OWC  Columbia.  Missouri  65201 


ra 


ABSOLUTE  MAXIMUM  RATINGS 


SLA-1 

SLA-1C 

SLA2 

SLA-3 

SLA4 

SLA-7 

SLA-9 

DL-10A 

DL-I01A 

DL704 

FOL-7 

UNITS 

Power  dissipation  at  25  C  ambient 

750 

750 

500 

1750 

900 

750 

500 

650 

650 

500 

500 

mW 

Derating  factor  above  25°C 

10 

10 

6.5 

23 

12 

12.5 

10 

10 

10 

6.6 

6.6 

mW/°C 

Peak  inverse  voltage  per  segment 

5.5 

5.5 

5.5 

9.0 

9.0 

3.0 

3.0 

6.0 

6.0 

3.0 

3.0 

volts 

Peak  inverse  voltage  per  decimal  point 

5.5 

5.5 

— 

4,0 

4.0 

3.0 

— 

3.0 

— 

3.0 

3,0 

volts 

Continuous  forward  current  per  segment 
or  decimal  point 

40 

40 

40 

45 

45 

40 

40 

25 

25 

30 

30 

mA 

Storage  and  operating  temperature: 

(Win  J 

56 

*55 

-55 

40 

40 

40 

40 

-55 

-55 

-20 

-20 

°c 

(Max.) 

100 

100 

100 

100 

TOO 

85 

85 

1O0 

100 

100 

100 

TYPICAL  OPTICAL  CHARACTERISTICS  PER  SEGMENT  OR  DECIMAL  POINT  AT  Z5°C 

Luminous  intensity  at: 

1,0 
IS 

1.0 
15 

1.0 
15 

3.0 
30 

3.0 

30 

0.3 
20 

0.3 
20 

— 

«. 

0J 

10 

1.4 

20 

mcd 
mA 

Peak  emission  wavelength 

630 

690 

690 

690 

690 

690 

690 

660 

660 

660 

700 

nm 

Spectral  line  half-width 

85 

85 

85 

85 

85 

85 

85 

40 

40 

40 

40 

nm 

Rise  and  fall  time 

450 

450 

450 

450 

450 

450 

450 

400 

400 

400 

400 

nsec. 

TYPICAL  ELECTRICAL  CHARACTERISTICS  PER  SEGMENT  OR  DECIMAL  POINT  AT  25°C 


Forward  voltage  per  segment  at: 

2.1 

2.1 

2.1 

4.7 

47 

2.2 

2.2 

3.4          3.4 

1,7 

1.7 

volts 

lF= 

15 

15 

J5 

30 

30 

20 

20 

20 
1.6 

20 

20 

20 

mA 

Forward  voltage  per  decimal  point  at; 

2.1 

2,1 

— 

2.3 

2.3 

2.2 

— 

1,7 

1,7 

volts 

«F= 

15 

15 

- — ■ 

30 

30 

20 

— 

20 

20 

20 

mA 

Maximum  reverse  current  per  segment  at: 

50 

50 

50 

50 

50 

100 

100 

100 

too 

100 

TOO 

jiA 

VR= 

5.5 

5.5 

5,5 

9.0 

9.0 

3,0 

3.0 

6,0 

6,0 

3.0 

3.0 

volts 

Maximum  reverse  current  per  decimal  paint  at: 

50 

50 

50 

SO 

100 

*__ 

100 

— 

100 

100 

/iA 

vr= 

5,5 

5,5 

4.0 

4.0 

3.0 

- — 

3.0 

— 

3.0 

3.0 

volts 

Capacitance  at  0  volts,  1  MH  i 

100 

100 

100 

50 

50 

TOO 

100 

80 

80 

120 

120 

PF 

Recommended  current  limiting  resistors 

for  operation  with  7447  and  TTL  supply: 

Segment 

150 

150 

150 

2.7 

2.7 

120 

T20 

68 

68 

390 

150 

n 

Decimal  Point 

150 

150 

82 

82 

T20 

150 

— 

390 

150 

n 

PRICE  LISTING  FOR  ALL  DISPLAYS 

Catalog 
Number 

Description 

149 

50-99 

100499 

500-999 

1000-gp 

Grouping 
Code 

21-00001 

Opcoa  SLA-1  f  7-segment  LED  display 

4.50 

4.25 

3.75 

3.40 

3.00 

10 

1M8001 

Pkg.  of  8  current  limiting  resistors  for  SLA-1 

.36 

.32 

.28 

.24 

.20 

16 

23-00011 

Opcoa  SLA-1  C,  7 -segment  LEO  display  W/colon 

4.75 

4.50 

4.00 

3.65 

3.25 

10 

1149011 

Pkg.  of  9  current  limiting  resistors  for  SLA-1  C 

.40 

.36 

.32 

.28 

.24 

16 

24-00002 

Opcoa  SLA-2,  ±1  LEO  display 

4.50 

4.25 

3.75 

3.40 

3.00 

10 

1144002 

Pkg.  of  4  current  limiting  resistors  for  SLA-2 

J2Q 

,17 

.14 

.12 

.10 

16 

21-00003 

Opcoa  SLA-3, 7 -segment  LEO  display 

7J5 

7.50 

7.00 

6.75 

6.50 

10 

1 148003 

Pkg.  of  8  current  limiting  resistors  for  SLA-3 

.36 

.32 

.28 

.24 

.20 

16 

2400004 

Opcoa  SLA4,  ±1  LED  display 

7.75 

7.50 

7.00 

6.75     I 

6.50 

10 

1145004 

Pkg,  of  5  currant  limiting  resistors  for  SLA-4 

.24 

.21 

.18 

.15 

.12 

16 

21-00007 

Opcoa  SLA-7,  7-segment  LED  display 

3.50 

3.25 

3.00 

2.75 

2.50 

10 

1148007 

Pkg.  of  8  current  limiting  resistors  for  SLA-7 

.36 

.32 

.28 

.24 

.20 

16 

24-00009 

Opcoa  SLA-9,  ±1  LED  display 

3.50 

3.25 

3.00 

2.75 

2.50     1 

10 

1 144009 

Pkg,  of  4  current  limiting  resistors  for  SLA-9 

.20 

.17 

.14 

.12 

.10 

16 

16-00010 

Lit ro nix  DL-10A,  7-segment  LED  display 

4.95 

4.75 

1     4.50 

455 

4.00 

10 

1148010 

Pkg.  of  8  current  limiting  resistors  for  DL-10A 

.36 

.32 

.28 

.24 

.20 

16 

16-00101 

Litronix  DL-101A,±1  LED  display 

4.95 

4.75 

4.50 

4.25 

4.00 

10 

1148101 

Pkg.  of  4  current  limiting  resistors  for  OL-101A 

.20 

.17 

.14    | 

.12 

.10 

16 

16-00704 

Litronix  DL-704,  7-segment  LED  display 

2.50 

2.25 

2.00 

1.75 

1.50 

10 

1148704 

Pkg,  of  8  current  limiting  resistors  for  DL704 

.36 

.32 

.28 

.24 

.20 

16 

16-00007 

Litronix  FD  L-7, 7-segment  LED  display 

3.25 

3.00 

2.75 

2.50 

2.25 

10 

1 148007 

Pkg,  of  8  current  limiting  resistors  for  FDL-7          j 

.36 

.32 

.28 

.24 

.20 

16 

39-00760 

Luminetics,  7-segment  incandescent  display 

3.00 

2.75 

2.50 

255 

1.90 

10 

39-001 60 

Luminetics,  ±1  incandescent  display 

3.00 

2.75     | 

2.50 

2.25 

1.90 

10 

P  0  BOX  773 

SOUO  STATI  SYSTEMS.  INC  column,  mksouri  5520. 


MOLEX  IC  TERMINALS 


Molex  Soldercon  ®  terminals  provide  the  advantage  of  plug-in  packages  for  connecting  integrated 
circuits.  Model  1938-4  terminals  accept  IC  pins  .007/.011"  x  .018/.030".  Rises  .180"  above  the 
board.  Terminals  are  made  of  Tin-plated  brass  .100"  on  centers;  and  require  .200"  between  rows. 
TERMINALS   ARE   SOLD    IN    MULTIPLES    OF    100   ONLY. 


Please  order  by  Catalog  Number  33  19384  (Grouping  Code  =  11): 


100  for  Si. 00 
200  for  SI. 80 


300  for  $2.60 
400  for  $3.40 


500  for  $4.20 

600  for  S5.00 


700  for  $5 .80 
800  for  S6.60 


900  for  $7.40 
1,000  for  $8.20 


Reel  of  25,000 $150.00 

rppi  ni  Rn  nnn  <R97«i  nn 

I  1DEI    Ut     JUfUUU      ******    r     i    **********     i     it-*******'*     ■■,••. »«•"•!•■     Iilll*ltll»t(ll»tii.    t|'t  I   U  iUu 


HEAT  SINKS 


Tfintatit   tu*mth*d   In  chain  fowm; 
can-tar  bfaafai  utl  pilar  iplrtaftfif. 


at(ar  WfafVtnf 


Soidtrtd  rrP*Ba1 


Wakefield  series  680  Heat  Sink  will  provide  optimum  natural  convection  cooling  per  unit  volume 
occupied  above  the  circuit  board.  It  permits  free  circulation  of  air  from  any  direction,  so 
mounting  in  any  position  is  possible,  this  Heat  Sink  is  pre-drilled  to  accept  TO-3  packages. 
Material  is  1100  aluminum  per  Mil-A-12545  and  is  black  anodized  per  Mil  A  8625  Type  II. 


I  Mpla  HIH 


■  TCHCfO  COMVtC  tlOM  «HAHACT¥W5T1CI 

5*     » 


U|     4 

<    -J 


1    .  1 

- 

1 

V 

^1 

fOO  JOO  300         400  1DO  ftOO  7CK7 


Q4   jffl 


10 

0 


BOO 


10HJ 


m 


t± 


fl  10  11  Jit  3B 

POWIH   DISSIPATION    IWATTll 


Catalog 
Number 


Description 


149 


50-99 


100-499 


500-999 


1000-u  n 


G  rouping 
Code 


11-68012 


PC  Board  Type  Heat  Sink 


1.20 


1.10 


1.00 


.90 


.80 


12 


VECTORBOARDS®*  VECTORPINS® 


"P"  Pattern  Micro-Vectorboard  ®  mounts  integrated  circuits  with  0 J00"  k  0.100"  hole  spacing. 
Material  is  G  10  epoxy  glass  board  per  Mit-P-18177  type  GEE  and  measures 
17"  x  4-1/2"  x  1/16".  Holes  are  0.042"  in  diameter.  Unit  accepts  all  6*  through  40^  pin  IC 
sockets  listed  on  pages  6  and  7.  In  addition,  terminals  listed  below  may  also  be  inserted  in  the  boards 
for  mounting  of  discrete  components  and  providing  test  points. 


Type  T-42-1   terminal  is  mainly  for  mounting  of  components  such  as  resistors,  diodes, 
transistors,  etc.  The  main  slot  holds  3  or  4  .025"  diameter  wires. 

Type  K-32,  J-pin  when  used  in  conjunction  with  T42  1t  provides  .025"  square  tail  for 
wire-wrapping  applications. 

The  new  type  T49  terminal  combines  the  advantages  of  a  .025"  square  wrap  post,  9/16" 
long  with  a  clip  action  upper  end  which  will  hold  leads  from  0.010"  to  0.040". 


Fl 


0 

v 


T42-1 


32 


T49 


Catalog 
Number 


Description 


1-24 


2549 


60-99 


100-249 


250-up 


Grouping 
Code 


2244062 
2201421 
22-10421 

22-01032 
22-10032 


22-01049 
22-10049 
22-00149 

22-00156 


Type  169P44062  Vectorboard 
Pkg.  of  100  TypeT42-1  Terminals 
Pkg.of  1000  Type  T42  1  Terminals 
Pkg.  of  100  Type  K-32  Pins 
Pkg.of  1000 Type  K-32  Pins 


Pkg.  of  100  Type  T49  Terminals 
Pkg.  of  1000  Type  T49  Terminals 
P-149  Insertion  TodI  forT42-1 
P-156  Insertion  Tool  for  T49 


4.25 
1.80 

11.70 
1.90 

12.60 


2.50 

21.00 

2.20 

4.50 


4.00 
1.60 

.1.20 
1.70 

12.10 


2.30 
20.00 


3.75 

1.40 
10.70 

1.50 
11.60 


2.10 
19.00 


3.50 

1.20 

10.20 

1.30 

11.10 


1.90 

18.00 


3.25 
1.00 

9.70 

1.10 

10.60 


1.70 
16.00 


9 

14 
14 
14 

14 


14 
14 
15 

15 


SOU®  STAVE  SirSITSMS.  IMC. 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


INTEGRATED  CIRCUITS 

&  DIODES 


Any  Quantity 
Per  ft  em  (Mix) 

Multiples  of  10 
Per  Item  (Mix) 

Catalog 
Number 

Description 

1- 

99 

100-     11 
999       1 

100 

100 

990 

1000- 

9990 

Grouping 
Code 

7400 

Quad  2-lnput  Pos.  NAND  Gate 

.34 

*%j£r                                  < 

30 

.28 

.26 

1 

7401 

Quad  2-lnput  Pos.  NAND  Gate  with  O/C  Outputs 

.34 

M      . 

30 

.28 

.26 

1 

7402 

Quad  2-lnput  Pos.  NOR  Gate 

.34 

.32      . 

30 

.28 

.26 

1 

7403 

Quad  2-lnput  Pos.  NAND  Gate  with  0/C  Outputs 

.34 

.32      . 

30 

.28 

.26 

1 

7404 

Hex  Inverter 

.36 

.34 

32 

.30 

.28 

1 

7405 

Hex  Inverter  with  O/C  Outputs 

.36 

.34 

32 

.30 

.28 

1 

7406 

Hex  Inverter  Buffer/Driver  with  O/C  30V  Outputs 

.56 

.53      . 

50 

.47 

.44 

1 

7407 

Hex  Buffer/Driver  with  O/C  30V  Outputs 

.56 

.53       . 

50 

.47 

.44 

1 

7408 

Quad  2-lnput  Pos.  AND  Gate 

.38 

.36       , 

34 

32 

.30 

1 

7409 

Quad  2-lnput  AND  Gate  with  Q/C  Outputs 

.38 

.36      . 

34 

.32 

.30 

1 

7410 

Triple  3  Input  Pos.  NAND  Gate 

.34 

.32      . 

30 

.28 

.26 

1 

7411 

Triple  3-1  nput  Pos.  AND  Gate 

.34 

.32 

30 

.28 

.26 

1 

7413 

Dual  NAND  Schmitt  Trigger 

.60 

.57 

54 

.51 

.48 

1 

7416 

Hex  Inverter  Buffer/Driver  with  O/C  15V  Outputs 

.54 

.51 

48 

.45 

.42 

1 

7417 

Hex  Buffer/Driver  with  O/C  15V  Outputs 

.54 

.51 

48 

.45 

.42 

1 

7413 

Triple  3-1  nput  OR  Gate 

.38 

.36 

34 

.32 

.30 

1 

7420 

Dual  4- Input  Pos,  NAND  Gate 

.34 

.32       , 

30 

.28 

.26 

1 

7421 

Dual  4-1  nput  Pos.  AND  Gate 

.34 

.32 

30 

.28 

.26 

1 

7423 

Expandable  Dual  4-lnput  Pos.  NOR  Gate  W/Strobe 

.84 

.80 

76 

.72 

.68 

1 

7425 

Dual  4'! nput  Pos.  NOR  Gate 

.54 

.51 

48 

.45 

.42 

1 

7426 

Quad  2-1  nput  High  Voltage  NAND  Gate 

.40 

.37 

34 

.31 

.28 

1 

7430 

84 nput  Pos.  NAND  Gate 

1A. 

.32 

30 

.28 

.26 

1 

7437 

Quad  2-lnput  Pos.  NAND  Buffer 

.56 

.53 

50 

.47 

.44 

1 

7438 

Quad  2-lnput  Pos.  NAND  Buffer  with  O/C  Outputs 

.56 

,53 

50 

.47 

.44 

1 

7440 

Dual  4-lnput  Pos.  NAND  Buffer 

.34 

.32 

30 

.28 

,26 

1 

7441 

BCD-To-Decimal  Decoder/Driver 

1.73 

1.64     1. 

55 

1.46 

1.37 

1 

7442 

BCD-To-Decimal  Decoder 

1.34 

1.27     1, 

20 

1.13 

1.06 

1 

7443 

Excess-3-To-Decimal  Decoder 

1.34 

1.27     1. 

20 

1.13 

1.06 

1 

7444 

Ex  cess-3- Gray -To -Decimal  Decoder 

1.34 

1.27     1 

20 

1.13 

1.06 

1 

7445 

BCDToDecimal  Dec/Or,  with  O/C  HV  Outputs 

1.71 

1.62     1. 

.53 

1.44 

1.35 

1 

7446 

BCD-To-Seven  Segment  Decoder/Orrver,  30V  Outputs 

1.34 

1.27     1. 

20 

1  #  1  O 

1.06 

7447 

BCD-To*Seven-Segment  Decoder/Driver,  15V  Outputs 

1.30 

U3     1 

16 

1.09 

1.02 

7448 

BCD-To-Seven-Segment  Decoder/Driver 

1.44 

1.37     1. 

29 

1.22 

1.14 

7450 

Exp.  Dual  2-Wide  2  Input  AND-OR-INVERT  Gate 

.34 

.32      . 

30 

.28 

.26 

7451 

Dual  2  Wide 24nput  AND-OR-INVERT  Gate 

mVrQ 

.32 

30 

-28 

.26 

7453 

Exp.  4-Wide  2-lnput  AND-OR-INVERT  Gate 

,0*l 

.32 

30 

.28 

.26 

7454 

4-Wide  2-lnput  AND-OR-INVERT  Gate 

.34 

.32      . 

30 

.28 

.26 

7459 

Dual  2-Wide  2-31nput  AND-OR-INVERT  Gate 

.34 

.32      . 

30 

.28 

.26 

7460 

Dual  4-lnput  Expander 

.34 

.32      , 

30 

.28 

.26 

7470 

Gated  J-K  Flip  Flop 

.46 

.43 

40 

.37 

.34 

7472 

J-K  Master-Slave  Flip-Flop 

.40 

.38      . 

36 

.34 

.32 

7473 

Dual  J-K  Master*Slave  Flip-Flop 

.52 

.49 

46 

.43 

.40 

|M 

SSI?|  SOLD®  SVAVS  STSTSMS*  Mt 

.»  COL 

BOX  773 
.UMBIAJ 

/IISSO 

URI     6! 

S201 

Any  Quantity 
Per  Item  (Mix) 

Multiples  of  10 
Per  Item  {Mix} 

Number 

Description 

1- 
99 

100- 
999 

1000 
Up 

100 

990 

1000- 
9990 

Grouping 
Code 

7474 

Dual  D-Type  Edge-Triggered  Flip-Flop 

.52 

.49 

.46 

.43 

.40 

1 

7475 

Quadruple  Bistable  Latch 

.80 

.76 

.72 

.68 

64 

7476 

Dual  J-K  Master  Stave  Flip-Flop  W/Preset  &  Cleai 

.58 

.33 

.52 

.49 

46 

7480 

Gated  Full  Adder 

.80 

.76 

.72 

.68 

64 

7482 

2-Bit  Binary  Full  Adder 

1.10 

1.05 

1.00 

55 

90 

7483 

4-Bit  Binary  Full  Adder  (Look  Ahead  Carry} 

1.72 

1.64 

1.56 

1.48 

1 

40 

7485 

4-Bit  Magnitude  Comparator 

1.58 

1.51 

1.44 

1.37 

1 

.30 

7486 

Quad  2-lnput  Exclusive^  Ft  Gate 

.60 

.57 

.54 

.51 

48 

1 

7489 

(8225)  64*Bit  Random  Access  Memory 

5.00 

4.75 

4.50 

4.25 

4 

.00 

7490 

Decade  Counter 

.85 

.80 

.75 

.70 

65 

7491 

8-Bit  Shift  Register 

1.48 

1.41 

1.34 

1.27 

1 

.20 

7492 

D  ivide-By-Twel  ve  C oimter 

.85 

.80 

.75 

.70 

65      1 

7493 

4- Bit  Binary  Counter 

.85 

.80 

.75 

.70 

.65 

7494 

4-Bit  Shift  Register  (Parallel-In,  Serial-Out) 

1.32 

1.26 

1.20 

1.14 

1. 

08 

7495 

4-Bit  Right-Shift  Left-Shift  Register 

1.32 

1.26 

1.20 

1.14 

1 

.08 

7496 

5-Bit  Shift  Register 

1.32 

1.26 

1.20 

1.14 

1. 

08 

74100 

Dual  4-Bit  Bistable  Latch 

1.80 

1.70 

1.60 

150 

1.40 

74104 

Gated  J-K  Master-Slave  Flip-Flop 

.70 

.67 

.64 

.61 

.58 

74105 

Gated  J-K  Master-Slave  Flip-Flop 

.70 

.67 

.64 

.61 

.58 

74107 

Dual  J-K  Master-Slave  Flip  Flop 

.54 

.51 

.48 

.45 

.42 

74121 

Monostable  Multivibrator 

.60 

.57 

.54 

.51 

.48 

74122 

Retriggerable  Monostable  Multivibrator  W/Clear 

.74 

.71 

.68 

.65 

.62 

74123 

Dual  Retriggerable  Monostable  Multivibrator  W/Clear 

1.30 

1.20 

1.10 

1.00 

.90 

74141 

BCD'TO'Decimat  Decoder/Driver 

1.75 

1.66 

1.57 

1.48 

1.39 

74145 

BCD-To-Decimal  Dec-/Dr.  with  0/C  HV  Outputs 

1.50 

1.43 

1.36 

1.29 

1.22 

74150 

16-Line-To- 1-Line  Data  Selector/Multiplexer 

2.00 

1.85 

1.70 

1.56 

1.40 

74151 

8-Line-To-t-Line  Data  Selector/Multiplexer 

1.30 

1.24 

1.18 

1.12 

1.06 

74153 

Dual  4-Line-To-MinB  Data  Selector/Muttiplexer 

1.70 

1.60 

1.50 

1.40 

1.30 

74154 

4-Line-To- 16-Line  Decoder/Demultiplexer 

2.75 

2.55 

2.35 

2.05 

1.85 

74155 

Dual  2-Line-To-4-Line  Decoder/Demultiplexer 

1.56 

1.49 

1.42 

1.35 

1.28 

74156 

Dual  2-Line-To-4-LIne  Decoder/Demultiplexer 

1.45 

1.39 

1.31 

1.23 

1.16 

74157 

Quad  2  Input  Data  Selector/Multiplexer 

1.56 

1.48 

1.39 

1.31 

1.23 

74158 

Quad  2-lnput  Data  Selector/Multiplexer  with  O/C 

1.56 

1.48 

1.39 

1.31 

U3 

74160 

Synch.  4-Bit  Decade  Counter  W/Asyneh.  Clear 

1.56 

1.48 

1.39 

1.31 

1.23 

74161 

Synch,  4-Bit  Binary  Counter  W/Asynch,  Clear 

2.10 

2.00 

1.90 

1.80 

1.70 

74162 

I    Synch.  4-Bit  Decade  Counter  W/Synch.  Clear 

2.10 

2.00 

1.90 

1.80 

1.70 

74163 

Synch.  4-Bit  Binary  Counter  W/Synch.  Clear 

2.10 

2.00 

1.90 

1.80 

1.70 

74164 

8-Bit  Shift  Register  {Serial  In,  Parallel-Out) 

2.10 

2.00 

1.90 

1.80 

1.70 

74165 

8-Bit  Shirt  Register  (Parallel-/Serial-ln,  Serial-Out) 

2.96 

2.82 

2.67 

252 

2.37 

74166 

8-Bit  Shift  Register  (Parallel-/Serial-ln,  Serial-Out) 

2.20 

2.09 

1.98 

1.87 

1.76 

74180 

8-Bit  Odd/Even  Parity  Generator/Checker 

1.30 

1.23 

1.16 

1.09 

1.02 

74181 

High  Speed  Arithmetic/Logic  Unit 

5.20 

4.90 

4.60 

4.30 

4.00 

74182 

Look-Ahead  Carry  Generator 

1.26 

1.19 

1.12 

1.05 

.98 

74192 

Presettable  Synch.  Decade  Up/Down  Counter 

2.10 

2.00 

1.90 

1.80 

1.70 

1 

74193 

Presettable  Synch.  4-Bit  Binary  Up/Down  Counter 

2.10 

2.00 

1.90 

1.80 

1.70 

74198 

8-Bit  Sh  ift  Register 

3.10 

2.95 

2.80 

2.65 

2.50 

74199 

8-Bit  Shift  Register 

3.10 

2.95 

2.80 

2.65 

2.50 

SOLDI  SITAITS  SVSTIMS.  QWC  columb  ^Missouri  65201 


®U®  §UMi  §YS1TiM§n  INC 


ORDER  BLANK 

ORDER   DESK:    800-325-2595 

(TOLL  FREE)      800-325-2981 

TWX  910-760-1453 

P.O.  BOX  773  •  COLUMBIA,  MISSOURI  65201  •  PHONE  314-443-3673 


DATE 


PHONE  NO. 


S 
0 

L 


T 
0 


Customer  No. 
P.O.  Number 


S 

H 

I 
P 

T 
0 


Is  this  your  first  order  with  Solid  State  Systems?     DYES      DNO 


Has  your  address  changed  since  your  last  order?   DYES  DNO 


FOR  OFFICE  USE  ONLY 

Invoice  No.  ' 


MCod 


I 


Ship  Via 


PCDMBA 


Quantity 


Catalog  No 


Description 


Grouping 
Code 


Data 
Sheet 


Price  Each 


-i 


Amount 


— 


Amount 

Price  Each 

Data 
Sheet 

1-S 

=  o 

Description 

■ 

o 

Catalog 

1 

1 

l 

l 

l 

1 

l 

l 

l 

l 

I 

l 

I 

l 

l 

l 

I 

1 

l     1 

Quantity 

i 

— 

— 

— 

Total  for  this  side  only 

TERMS:    Rated  firms  NET  30  days.  Others  check  or  money  order  with  order.  BankAmericard  and  Mastercharge  are  welcome.  The 
following  standard  shipping  charges  apply  to  all  orders. 


If  your  merchandise  total  is  between: 


STANDARD  CHARGES 

$    0.00$  4.99 add $1.00 

$    5.00  -  $24.99 add $0.75 

$  25.00- $49.99 add .$0.50 

$  50.00  -  $99.99 add $0.25 

$100.00  and  up NO  CHARGE 

Above  charges  include  shipping  via  First  Class  or  UPS 
(your  choice),  and  insurance  for  all  domestic  shipments. 


SPECIAL  CHARGES 

COD $1.00 

Air  Mail $0.50 

Postal  Insurance $0.25 

Special  Delivery $0.75 


additional 
additional 
additional 
additional 


^■™ 


CHARGE  TO: 

D  BankAmericard 
D  Mastercharge 

Acct.  No.    


Expiration  Date 


Interbank  No.  (for  Mastercharge  only) 


BANKAMEftlMRD 


mdstei  char 


w 


CASH  SUBMITTED: 

D  Cash       $ 

□  Check     $ 

□  M.d.      $ 


CREDIT  CERTIFICATES: 

Number           Amount 
$ 

S 

S. 


Total  from  reverse  side 


MERCHANDISE  TOTAL 


4%  SALES  TAX 
(Mo.  Residents  Only) 


"Shipping  &  Handling  DUPS 

(Rate  Chart  on  reverse  side)    DFC 


SPECIAL  HANDLING 
D  Insurance         D  AM 
□  Spec.  Del.        DCOD 


TOTAL  DUE 


SCHOTTKY  TTL 


Any  Quantity 
Per  Item  (Mix) 

Multiples  of  JO 
Per  (tern  (Mix) 

Catalog 
Number 

Description 

i- 

99 

100- 

999 

1000 
Up 

100- 
990 

1000- 
9990 

Grouping 
Code 

74S00 

Quad  2-lnput  Pos.  NAND  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S01 

Quad  2-lnput  Pas.  NAND  Gate  with  0/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S02 

Quad  2-lnput  Pos.  NOR  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S03 

Quad  2-lnput  Pos,  NAND  Gate  with  0/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S04 

Hex  Inverter 

1.00 

.95 

.90 

.85 

.80 

1 

74S05 

Hex  Inverter  with  0/C  Outputs 

1.00 

.95 

.90 

.85 

.80 

1 

74S08 

Quad  2-lnput  Pos.  AND  Gate 

•88 

.84 

.79 

.75 

.70 

1 

74S09 

Quad  2-lnput  AND  Gate  with  0/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S10 

Triple  3- Input  Pos*  NAND  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S11 

Triple 3-1  nput  Pos.  AND  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S15 

Triple  3-1  nput  Pos.  AND  with  0/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S20 

Dual  4- Input  Pos.  NAND  Gate 

-88 

.84 

.79 

.75 

.70 

1 

74S21 

Dual  4-1  nput  Pos.  AND  Gate 

.88 

.84 

.79 

.75 

1     .70 

1 

74S22 

Dual  4-1  nput  Pos.  NAND  Gate  with  0/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S40 

Dual  4^1  nput  Pos.  NAND  Buffer 

1.00 

.95 

.90 

.85 

.80 

1 

74S50 

Exp.  Dual  2-Wtde  2-lnput  AND-OR-INVERT  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S51 

Dual  2-Wide  2-lnput  AND-OR-INVERT  Gate 

.88 

.84 

.79 

.75 

.70 

1 

74S60 

Dual  4*1  nput  Expander 

.88 

.84 

.79 

.75 

.70 

1 

74S64 

4-2-3-2-lnput  AND-OR-INVERT  Gate 

.88 

.84 

,79 

.75 

.70 

1 

74S65 

4-2-3-2-lnput  AND  OR-INVERT  Gate  with  O/C  Outputs 

.88 

.84 

.79 

.75 

.70 

1 

74S73 

Dual  J-K  Master-Slave  Flip-Flop 

1.82 

1.73 

1.63 

1.54 

1.44 

1 

74S74 

Dual  D-Type  Edge-Triggered  Flip-Flop 

1.82 

1.73 

1.63 

1.54 

1.44 

1 

74S76 

Dual  J-K  Master-Slave  Flip- Flop  W/Preset  &  Clear 

1.82 

1.73 

1.63 

1.54 

1.44 

1 

74S78 

Dual  J-K  Master-Slave  Flip- Flop  W/Preset  &  Clear 

1.82 

1.73 

1.63 

1.54 

1.44 

T 

74S107 

Dual  J-K  Master-Slave  Flip-Flop 

1,82 

1.73 

1.63 

1.54 

1.44 

1 

74S112 

Dual  J-K  Edge-Trig*  F  F  W/Sep.  Clock  &  Clear 

1.82 

1.73 

1.63 

1.54 

1.44 

1 

74S113 

Dual  J-K  Edge-Trig,  F-F  W/Sep.  Clock 

1.82 

1.73 

1.63 

1.54 

1.44 

T 

74S114 

Dual  J-K  Edge-Trig.  F-F  W/Common  Clock  &  Clear 

1.82 

1.73 

1.63 

1.54 

1.44 

1 

74S140 

Dual  4- Input  Pos.  NAND  Buffer/Line  Driver 

1.00 

.95 

.90 

.85 

.80 

1 

LINEAR  IC'S 


NE501A 

Video  Amplifier 

2.99 

2.82 

2.66 

2.49 

2.32 

1 

NE526A 

Analog  Voltage  Comparator 

3.59 

3.38 

3.17 

2.95 

2.74 

1 

NE531V 

High  Slew- Rate  Operational  Amplifier 

3.20 

3.04 

2.88 

2.72 

2.56 

1 

NE536T 

FET  Input  Operational  Amplifier 

7.31 

6.88 

6.45 

6.02 

5.59 

1 

NE540L 

Power  Driver 

2.16 

2.04 

1.92 

1.80 

1.68 

1 

SE540L 

Power  Drfver 

4.48 

4.20 

3.92 

3.64 

3.36 

1 

NE550A 

Precision  Voltage  Regulator 

1.30 

1.23 

1.16 

1.09 

1.02 

t 

NE555V 

Timer 

1.10 

1.05 

1.00 

.95 

.90 

1 

NE560B 

Phase  Locked  Loop 

3.57 

3.36 

3.15 

2,94 

2.73 

1 

NE561B 

Phase  Locked  Loop 

3.57 

3.36 

3.15 

2.94 

2.73 

1 

NE562B 

Phase  Locked  Loop 

3.57 

3.36 

3.15 

2.94 

2.73 

1 

NE565A 

Phase  Locked  Loop 

3.57 

3. 36 

3.15 

2.94 

2.73 

1 

NE566V 

Function  Generator 

3.57 

3.36 

3.15 

2.94 

2.73 

1 

mm  sir a?i 


^§78  WIS-  OKlCa    COLUMBIA,  MISSOURI    65201 


Any  Quantity 
Per  Item  (Mix) 

Multiples  of  10 
Per  Item  (Mix) 

Catalog 
Number 

Description 

99 

100- 
999 

1000    1 
Up 

100- 
990 

1000- 
9990 

Grouping 
Code 

NE567V 

Tone  Decoder  Phase  Locked  Loop 

3.57 

3.36 

3.15 

2.94 

2.73 

1 

N5111A 

(ULN2111)  FM  Detector  and  Limiter 

.90 

.86 

.82 

.78 

.74 

1 

N5556V 

Operational  Amplifier 

2.10 

1.95 

1.80 

1.65 

1.50 

1 

N5558V     ' 

Dual  Operational  Amplifier 

1.00 

.95 

.90 

.85 

.80 

1 

N5596A 

Balanced  Modulator-Demodulator 

1.87 

1.77 

1.66 

1.56 

1.46 

1 

f*A709CV 

Operational  Amplifier 

.50 

.47 

.44 

.41 

.38 

1 

/jA710CA 

Differential  Voltage  Comparator 

.50 

.47 

.44 

I      -*1 

.38 

1 

M711CA 

Dual  Voltage  Comparator 

.55 

.52 

.49 

.46 

.43 

1 

juA723CA 

Precision  Voltage  Regulator 

1.00 

.95 

.90 

.85 

.80 

1 

juA733CA 

Differential  Video  Amplifier 

1.90 

1.80 

1.70 

1.60 

1.50 

1 

*iA741CV 

High  Performance  Operational  Amplifier 

.80 

.75 

.70 

.65 

.60 

1 

juA747CA 

Dual  Operational  Amplifier 

1.10 

1D4 

.98 

.92 

.86 

1 

fiA748CV 

High  Performance  Operational  Amplifier 

.80 

.75 

.70 

.65 

.60 

1 

LM335 

5V,  600  mA  Voltage  Regulator 

2.85 

2.72 

2,64 

2,55 

2.46 

1 

LM33B 

12V,  500  mA  Voltage  Regulator 

3,85 

3.66 

3.46 

3.27 

3.06 

1 

LM337 

15V,  450  mA  Voltage  Regulator 

4.05     3.70 

3.51 

3.31 

3.12 

1 

DIODES 


1N270 

Germanium  Switching  Diode 

.15 

.14 

.13 

.12 

.11 

2 

1N4Q01 

1  Amp,  50  PRV  Rectifier  Diode 

.10 

.09 

.08 

.07 

.06 

2 

IN  4002 

1  Amp,  100  PRV  Rectifier  Diode 

.11 

.10 

.09     | 

.08 

.07 

2 

1N4003 

1  Amp,  200  PRV  Rectifier  Diode 

.13 

.12 

.11 

.10 

.09 

2 

IN 4004 

1  Amp,  400  PRV  Rectifier  Diode 

.14 

.13 

.12 

.11 

.10 

2 

1N4005 

1  Amp,  600  PRV  Rectifier  Diode 

.15 

.14 

.13 

.12 

.11 

2 

IN  4006 

1  Amp,  800  PRV  Rectifier  Diode 

.17 

.16 

.14 

.13 

.12 

2 

1N4007 

1  Amp,  1000  PRV  Rectifier  Diode 

.20 

1    .18 

.16 

1       14 

.12 

1         2 

1N4148 

Silicon  Switching  Diode                                               i 

.10 

.09 

.08 

-07 

.06 

2 

IN 746 A 

3.3V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N747A 

3.6V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

IN 748 A 

3.9V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

IN 749 A 

4.3V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N750A 

4.7V,  400  mW  Zener  Diode 

.25 

.22 

.19    ! 

.16 

.13 

2 

1N751A 

5.1V, 400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N752A 

5.6V, 400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N753A 

6.2V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N754A 

6.8V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N755A 

7.5V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N756A 

8.2V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N757A 

9,1V,  400  mW  Zener  Diode 

.25 

.22 

.19 

.16 

.13 

2 

1N758A 

10V,  400  mW  Zener  Diode 

.25 

21 

.19 

.16 

.13 

2 

1N759A 

12V,  400  m W  Zener  Diode 

.25 

.22 

.19 

|      .16 

.13 

2 

All  IC's  are  supplied  in  8—,  14—,  16— f  or  24— pin  DIP  (Dual-in-line}  plastic  or  ceramic  package  except  for  NE536, 
NE540  and  SE540,  which  come  in  TO— 5  package.  Voltage  Regulators  LM335,  LM336.  and  LM337  are  supplied  in 
TO— 3  (Diamond)  package. 

We  give  FREE  data  sheets  upon  request,  so  ask  for  those  data  sheets  that  you  NEED,  even  for  those  listed  IC's  that 
you  are  not  buying. 


P  Q   BOX  773 
&10D  SYA?B  STOTSKIS,  ONC.    COLUMBIA,  MISSOURI    65201 


IC  INTERFACE  HARDWARE 


COMPONENT  SOCKET  ADAPTERS 

Cambion  Component  Socket 
Adapters    provide    versatility    of 

component  pluging  for  your 
discretes.  Two  models  are  available 
for  both  14-  and  16-pin  sockets. 


INTEGRATED  SOCKET  STRIP 

Cambion's  Integrated  Socket  Strips  provide  high 
density  packaging  of  dual-in-line  integrated 
circuits.  The  Integrated  Socket  has  0.025" 
tin-plated  square  wire-wrap  pins  aligned, 
double-column  (40  pins  per  column},  on  0.300" 
centers  (.100"  grid}.  As  many  as  five  dual-in-line 
packages  can  be  mounted  per  integrated  socket 
strip.  The  socket  pins  are  replaceable,  if  damaged, 
and  can  be  ordered  separately. 


IC  INSERTION-EXTRACTION  TOOL 

This  handy  tool  properly  positions  the 
integrated  circuit  for  insertion  or 
extraction.  Securely  grips  IC  between 
the  leads  and  under  the  body  with 
clothespin-like  action.  Practically  any 
dual  in-line  IC  with  14  or  16  leads 
aligned  on  .300"  centers  can  easily  be 
inserted  or  extracted  regardless  of  tight 
packaging  and  without  damage  to  the 
fragile  IC  leads. 


BATTERY  HOLDERS 

Cambion's  new  molded  battery  holders  offer  users  many  advantages,  not  the  least  of 
which  is  the  corrosion  resistant,  molded  glass-filled  nylon  body. 

Models  are  now  available  for  both  C  size  and  D  size  batteries.  They  have  tinned 
phosphor  bronze  contacts  and  built-in  shock  and  vibration  retainers  which  assure 
dependable,  non-shorting  service  under  the  most  severe  environmental  and  operating 
conditions. 

These  strong  individual  holders  interlock  with  each  other,  by  a  unique  design,  which 
permits  building  sturdy  single  unit  assemblies  for  any  multiple  of  batteries  required, 
for  either  series  or  parallel  hook-up.  Truly  high  density  packaging! 


HAND  WIRE-WRAPPING  TOOL 

Cambion's  new  pocket-size  wire-wrapping  tool  is  for  hand  wrapping 
No.  30  AWG  wire  on  a  .025"  square  wrapost.  It  is  ideal  for  making 
field    modifications,    building   small    systems  in  the   laboratory, 

teaching,  for  the  hobbyist,  and  for  other  non-production  wrapping 
applications. 


■ 


The  wrap  is  made  by  inserting  pre-stripped  wire  in  the  end  of  the 

tool   in  either  of  the  offset  holes  until  the  insulation  comes  in 

contact  with  the  tool.  The  end  of  the  wire  is  bent  back,  in  a  "V"  shape  to  secure  the  wire  in  the  tool  and  the  insulated  portion  is  then 
bent  at  right  angles  to  the  axis  of  the  tool.  Now  the  center  of  the  tool  is  placed  over  the  center  of  the  wrapost  and  lowered  to  the  level 
where  the  connection  is  to  be  made;  it  is  turned  by  hand  until  all  the  stripped  wire  has  been  wrapped  around  the  post. 

A  modified  wrap  ...  one  where  the  insulation  portion  of  the  wire  is  wrapped  for  about  one  and  a  half  turns  around  the  post  before 
the  regular  wrap  . .  ,  can  be  made  by  permitting  the  insulation  to  turn  with  the  first  one  and  a  half  turns  of  the  tool 

Performance  of  wir^wrapped  connections  made  with  this  tool  is  excellent  with  high  strip  strengths  and  gaslight  corners  achieved. 


PRICE  LISTING 


Catalog 
Number 

Description 

1-24 

2549 

50-99 

100-240 

250-up 

Grouping 
Code 

43-37253 

14-Pin  Component  Adapter 

1.10 

1.00 

.90 

.80 

.70 

27 

43-37283 

16-Pin  Component  Adapter 

1.20 

1.10 

1.00 

.90 

.80 

27 

43-37390 

IC  Insertion/Extraction  Tool 

1.40 

1.30 

1.20 

1.10 

1.00 

27 

43-28000 

Molded  Size  "C"  Battery  Holder 

.45 

.41 

.37 

.33 

.29 

27 

43-28010 

Molded  Size  "D"  Battery  Holder 

,H0 

.41 

.37 

.33 

.29 

27 

43-10004 

Integrated  IC  Socket  Strip 

4.75 

4.50 

4.00 

3.75 

3.50 

27 

43-18160 

Hand  Wire-Wrapping  Tool 

2.00 

1.90 

1.80 

1.70 

1.60 

27 

SOLD®  S1TA7B  SYSTBMSA  DNC 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


ONE  CHIP  CALCULATORS  &  CLOCK  CHIP 


FEATURES 


* 
* 
* 

* 
* 


ADD,  SUBTRACT,  MU LTIPLY,  DIVIDE 

12  DIGIT  DISPLAY  AND  CALCULATE 

CHAIN  CALCULATIONS 

FIXED  DECIMAL  POINT  AT  0, 2,  3,  OR  4 

AUTOMATIC    LOCKOUT    OF    "UNSURE 

OPERATION 

TRUE  CREDIT  BALANCE  SIGN  DISPLAY 

AUTOMATIC  OVERFLOW  INDICATION 

LEADING  ZERO  SUPPRESSION 

TWO  PHASE  CLOCK  OPERATION 

25  KHz  CLOCK  RATE 


it 


REPEAT 


GENERAL  DESCRIPTION 

The  CT5001  is  a  single  MOS  chip  containing  all  of  the  logic 
necessary  for  a  12  digit  calculator  with  display  type  readout. 
Multiplexed  seven  segment  outputs  enable  operation  with 
LED's,  incandescent,  and  fluorescent  or  gas  discharge  tubes 
with  a  minimum  of  external  components,  The  unit  is  packaged 
in  a  40  lead  DIP. 

FUNCTIONAL  DESCRIPTION 

The  basic  arithmetic  in  the  CT5001  is  done  with  two  -  52  bit, 
or  13  digit,  registers.  This  results  in  capacity  for  13  BCD  digits 
of  which  12  are  used  so  that  arithmetic  limitations  are  as 
follows: 

Number  entry  ... 

Addition,  subtraction  . .  * . 


Multiplicand  +  multiplier 
Dividend  ,, 

Quotient  +  divisor 


*  *  *  * » 


■  ■  ■  * 


.       .       t        -        -r 


....  ..12  digits 

12  digits 

12  digits 

11  digits 

11  digits 

.  .12  digits 


FEATURES 


* 
+ 

* 

* 
it 


ADD,  SUBTRACT,  MULTIPLY,  DIVIDE 

12  DIG  IT  DISPLAY  AND  CALCULATE 

CHAIN  CALCULATIONS 

FIXED  DECIMAL  POINT  AT  0,  tr  2, 3, 4,  OR  S 

AUTOMATIC    LOCKOUT   OF    "UNSURE"    REPEAT 

OPERATION 

TRUE  CREDIT  BALANCE  SIGN  DISPLAY 

AUTOMATIC  OVERFLOW  INDICATION 

SUPPRESSION  OF  DISPLAY  OF  LEADING  ZEROS 

TWO  PHASE  CLOCK  OPERATION 

2B  KHz  CLOCK  RATE 

AUTOMATIC  KEYBOARD  DEBOUNCE 

SEVEN  SEGMENT  OUTPUTS 


GENERAL  DESCRIPTION 

The  CT5005  is  a  single  MOS  chip  with  all  the  logic  necessary 
for  a  twelve-digit  four  function  calculator  with  an  extra 
storage  register  for  memory  or  constant  application.  Capability 
includes  +,  -,  x,  and  -=*  as  well  as  a  memory  register  for  storage 
of  internal  values  or  four  function  constant  capability. 
Multiplexed   seven  segment  outputs  enable  operation  with 


*  AUTOMATIC  KEYBOARD  DEBOUNCE 

*  SEVEN  SEGMENT  OUTPUTS 

*  MULTIPLEXED  OUTPUTS  FOR  MINIMUM  EXTERNAL 
COMPONENTS 

*  12    MILLISECOND    ADD/SUBTRACT    AND    400 
MILLISECOND    MULTIPLY/DIVIDE    (WORST   CASE) 


Timing  for  register  circulation  is  arranged  in  13  groups  of  four, 
each  one  representing  time  for  one  BCD  digit.  At  a  clock  rate 
of  25  KHz,  this  results  in  a  circulation  or  "word  time"  of  2ms. 
As  each  digit  is  entered  in  BCD  form  from  the  keyboard,  it  is 
inserted  via  the  "arithmetic  unit"  into  the  rightmost  digit  of 
the  display  register  while  previous  contents  are  shifted  one 
digit  to  the  left, 

Upon  depression  of  any  function  key:  add,  subtract,  multiply, 
divide,  data  representing  the  first  operand  is  shifted  into  the 
non-display  register.  After  entry  of  the  operator  or,  second 
argument,  the  ±  is  used  to  execute  =  and  the  contents  of  the 
registers  are  added,  subtracted,  multiplied  or  divided  so  that 
the  result  is  then  displayed.  Decimal  point  position  is 
predetermined  by  two  inputs  from  a  four  position  keyboard 
switch.  The  CT5001  is  available  in  a  40-Pin  Dual-in-line 
package.  To  prevent  damage  to  the  chip  due  to  static 
electricity  discharge  during  wiring,  use  of  a  solder-tab  (Catalog 
Number  41-37663)  or  wire-wrap  (Catalog  Number  41  38853) 
socket  is  recommended. 


* 

+ 


MULTIPLEXED  INPUTS  AND  OUTPUTS  FOR  MINIMAL 

EXTERNAL  COMPONENTS 

12    MILLISECOND    ADD/SUBTRACT    AND    400 

MILLISECOND  MULTIPLY/DIVIDE  (WORST  CASE) 

STORAGE  REGISTER  MEMORY 

SINGLE  VOLTAGE  SUPPLY  IS  POSSIBLE 

SEGMENT  AND  DIGIT  BLANKING  FOR  DISPLAY 


LED,  incandescent,  fluorescent  or  gas  discharge  displays  with  a 
minimum  of  external  display  interface  components.  Feedback 
of  timing  signals  through  a  matrix  type  keyboard  reduces  pin 
count  to  28  as  well  as  eliminating  keyboard  encoding 
requirements  from  the  printed  circuit  board.  The  unit  is 
packaged  in  a  28  lead  DIP. 


PLEASE  NOTE:  See  following  page  for  the  CT5005  functional  description.  Also  note  pricing  information  for  CT5Q01,  CT50Q5,  and 
CT7001  at  bottom  of  following  page. 


SOU©  S7ATF1  SYSTEMS,  OHC   COLUMBIA3MISSOURI    65201 


FUNCTIONAL  DESCRIPTION 

In  order  to  minimize  components,  the  keyboard  is  a  matrix 
type  where  the  output  signal  which  drives  the  digit  driver 
signal  for  the  display  will  feed  back  into  two  input  lines  via 
switch  closures  on  keyboard,  This  allows  capacity  for 
twenty-four  (24)  keys  of  which  twenty -one  (21)  are  used. 
Circuitry  for  digit  and  segment  drivers  varies  according  to  the 
type  of  display  used,  The  CT5005  is  amenable  to  driving  most 
commercially  available  displays  including  LED's,  gas  discharge, 
fluorescent  and  incandescent  displays.  The  only  other  circuit 
necessary  is  a  two-phase  oscillator  and  a  power  supply  which 
again  varies  depending  on  the  type  display  used. 

Turning  on  power  to  the  chip  can  he  made  to  act  the  same  as 
C  and  CM  as  well  as  setting  the  decimal  point  to  position  2. 
This  is  done  with  a  power  on  circuit  which  activates  pin  1 8, 
SWON. 

Note  the  unique  method  of  establishing  the  decimal  point  for 
the  fixed  point  calculations  by  simultaneous  depression  of  the 
decimal  point  and  a  number  key.  This  method  saves  the  use  of 


a  slide  switch  on  the  keyboard  and  allows  entry  of  any  decimal 
point  position  up  to  5  as  well  as  clearing  all  registers  for  start 
of  a  new  calculation. 

Usage  of  the  memory  register  can  be  summarized  as  follows: 
!:■  To  enter  a  number  A,  enter  A  followed  by  +M  or-M. 

2.  To  enter  a  product  or  quotient,  execute  as  fallows: 
A  X  B  ±  followed  by  +M  or  -M. 

3.  Use  of  +M  or  -M  reveals  the  number  entered  in  the  display 
register.  However,  the  number  is  not  available  for  use  with 
any  other  function  key  unless  it  is  re-entered. 

4.  Following  usage  of  +M  or  -M,  the  only  valid  entry  is  a 
number  key  or  RM. 

5.  Use  of  a  memory  key  +M,  -M,  RM  or  CM,  disrupts  any 
chain  calculation  in  progress. 

6.  Contents  of  the  memory  register  are  restricted  to  positive 
values. 

The  memory  register  may  also  be  used  to  contain  a  constant 
which  may  then  be  used  as  a  factor  in  multiplication,  division, 
addition  or  subtraction. 


FEATURES 


*  28/30/31  DAY  CALENDAR 

*  12/24  HOUR  CLOCK  AND  24  HOUR  ALARM 

*  SNOOZE  ALARM 

*  50/60  Hz  OPERATION 

*  6  DIG  IT  D ISPLAY  (HR„  MIN.,  SEC.) 

*  DIRECT  DRIVE  TO  LEO  SEGMENTS 

*  CLOCK  RADIO  FEATURES 

*  ON  CHIP  60  Hz  BACK  UP 

*  EASILY  SETTABLE  COUNTERS 


*  SEGMENT  AND  DIGIT  BLANKING 

*  SEGMENT    AND    DIGIT    OUTPUTS    CAN    BE    'WIRE 
OR'D"TO  SHARE  CALCULATOR  DISPLAY 


GENERAL  DESCRIPTION 

The  CT70D1  is  an  extremely  versatile  M OS/LSI  digital 
clock/calendar  circuit  The  CT7001  has  many  features  which 
may  be  selected  by  various  wiring  configurations  of  the  three 
scanned  input  pins.  This  enables  the  user  to  easily  tailor  the 
CT700T  to  his  specific  requirements. 

Setting  any  counter  (time,  alarm,  calendar,  and  clock  radio)  is 
quite  easy  since  a  separate  control  of  the  hour  and  minutes 
digits  has  been  provided.  The  setting  of  any  counter  does  not 
effect  the  contents  of  any  other  counter* 

The  CT7001  will  accommodate  either  four  or  six  standard 
seven  segment   displays.  The   CT7001    will  direct  drive  the 


anodes  of  common  cathode  LED's.  The  CT7001  segment  and 
digit  outputs  can  be  "wire  OR'd"  to  other  chips. This  enables 
the  clock  to  iiare  the  same  displays  with  another  chip  such  as 
a  calculator. 

The  CT7001  can  operate  from  either  a  50/60  Hz  line 
frequency  or  an  external  100.8  KHz  signal.  If  battery  back  up 
is  provided,  the  CT7001  will  continue  to  operate  during  power 
outages  by  virtue  of  an  on-chip  50/60  Hz  backup  counter,  The 
CT7001  Digital  Clock/Calendar  Integrated  circuit  is  available 
in  23-Pin  Dual-in-line  package.  Due  to  extreme  sensitivity  of 
MOS  chips  to  static  electricity  discharge,  use  of  a  28-Pin 
socket,  solder-tab  or  wire-wrap  (Catalog  Number  41-37833  or 
41-38903),  is  strongly  recommended. 


PRICE  LISTING 


Catalog 
Number 


Description 


\A 


54 


10-24 


25-up 


Grouping 
Code 


63-05001 
63-05005 
63-07001 
60-05157 


Four  function  calculator  IC 

Four  function  calculator  IC  with  memory 

Digital  clock/calendar  IC 

Set  of  data  sheets  for  CT5001,  CT5005  &  CT7001 


7.50 

13.50 

13.50 

.50 


7.00 
12.60 
12.60 


6.00 

11.70 
11.70 


5.50 
10.80 

10.80 


25 
25 
25 
26 


PLEASE  NOTE:  Complete  kits  of  all  parts  and  boards  for  each  of  the  above  calculators  and  clock/calendar  will  be  available  by  early 
December.  Please  write  or  call  for  further  details. 


P  0  BOX  773 

SOLID  S1TA7S  SYSITSMS,  INC  Columbia,  Missouri  65201 


Digital  to  Analog  Converters 


DESCRIPTION 

The  SS-2000  series  of  Digital  to  Analog  Converters  feature  a 
combination  of  linearity,  temperature  stability,  and  settling 
time  compatible  with  moderate  to  severe  environment 
operational  requirements,  at  the  lowest  possible  cost. 

Use  of  stable  thin  film  resistor  networks,  high  quality 
reference  devices  and  low  drift  operational  amplifiers  offers 
the  user  the  most  economical  solution  where  reliability  and 
long  term  stability  are  important  requirements, 

The  SS2035,  SS2135,  and  SS2235  are  8-r  10-  and  12-bit 
binary  D/A  converters  respectively;  whereas  SS2635  and 
SS2735  are  3  and  4  digit  BCD  D/A  converters. 


FEATURES 

♦  INEXPENSIVE    -   a    significant    breakthrough    in 
price/performance  ratio. 

*  LOW  LINEARITY  DRIFT  -  O.DD05%  per  °C  for  binary 
and  tVz  LSB  for  BCD  converters  over  full  operational 
temperature  range  of  D°C  to  +  7Q°C, 

•  INTERNAL/EXTERNAL  REFERENCE  -  User  selectable 
by  jumper  wire.  Internal  reference  available  for  external  use. 

♦  FULL  SCALE  AND  ZERO  OFFSET  ADJUSTABLE  -ex- 
ternally fine-trimable  for  improved  accuracy. 

•  RUGGED  CONSTRUCTION  -encapsulated  module 
designed  for  DIP  IC  compatibility.  High  quality  brass,  gold 
plated  pins,  0.1"  centers. 


OPERATIONAL  CHARACTERISTICS 

SPECIFICATION 

SS2035,SS2135,SS2235 

SS2G35 

SS2735 

Full  Scale  Output  Voltage  Range 

OV  to  +10V,  Straight  Binary  Code 

-5V  to  +5V,  Offset  Binary  Code 

-10V  to  +1QV,  Offset  Binary  Code 

0Vto+9.99V,BCD  Code 

0Vto+9.999VBCDCode 

Output  Impedance  (DC) 

<0J  ohm 

<  0.1  ohm 

<  0.1  ohm 

Reference  Output 

+ 10.08V  nominal  at  5mA        I 

+1 0.08V  nominal  at  5mA 

■10.00V  nominal  at  5mA 

Input  Logic  Levels 

TTL/DTL  Compatible 
Vh  -  Logical  Tf  +2.1  V  to  +55V;  V  |_  =  Logical  t0\  OV  to  +0,7 V 

Data  Loading 

1  TTL  Load/Line 

Temperature  Range: 
Rated  Specifications 

Operational 
Storage 

0°C  to  +70°C 
•25°C  to  +85°  C 
-55<>Cto+1000C 

Power  Requirements 

+15V±5%at30mA 
■15V  ±5%  at  20mA 
+5V  ±5%  at  80mA 

Dimensions 
LxWxH 

2"  x  2"  x  0.54"               |           2"  x  2"  x  0.54" 

3"  x  2"  x  0.54" 

SPECIFICATIONS  (TA=25°C  UNLESS  OTHERWISE  NOTED) 


SPECIFICATION 

SS2035 

SS2135 

SS2235 

SS2635 

SS2735 

Resolution 

8  Binary  Bits 

10  Binary  Bits 

12  Binary  Bits 

3  Digit  BCD 

4  Digit  BCD 

Setting  Time  (to  ±0.05%  of  full  scale, 
0to+10V) 

20^S 

2QfiS 

20^S 

20mS 

20mS 

Linearity  in  percent  of  full  scale  fat  25° C) 
(at  0°C  to +70°C| 

0.2 

0.25 

0.05 
0.075 

0.0125 
0.0375 

0.05 
0.075 

0.01 
0.035 

Zero  Offset  in  percent  of  full  scale 

0.2 

0.05 

0.05 

0.05 

0.05 

Scale  Factor  (Gain)  Error  in  percent  of  reading 

0.2 

0.1 

0.1 

0.1 

0.1 

Zero  Drift  in  percent  of  full  scale  per  °C 
from00Cto+7iTC 

0.005 

0.002 

0.002 

0.002 

0.001 

Scale  Factor  (Gain)  Drift  in  percent  of  reading 
pert,CfromOcCto+700C 

with  Internal  Reference 

with  External  Reference 

0.005 
Q.003 

0.005 
0.003 

0.004 
0.002 

0.004 
0.002 

0.003 

0.001 

Output  Load,  rated  specification  (short  circuit  proof) 
RLinKfl 
Cl  inpf 

>2 
<1000 

>2 

<1000 

>2 
<1000 

>2 

<1000 

>2 

<1000 

Long  Term  Stability  in  percent  of  full  scale 
per  1000  hours 
per  year 

0.1 
0.3 

0.05 
0.1 

0.05 
0.1 

0.05 
0.1 

0.025 

0.05 

■gti   HJVjjl ^tT  1 1 J^"* 

w 


SOUD  SMITI  SWTBWIS,  Wit 


a 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


— — i— - 


.i 


Analog  to  Digital  Converters 


DESCRIPTION 

The  SS-3000  series  of  Analog  to  Digital  Converters  are  highly 
versatile  over  a  wide  range  of  applications  such  as  Digital  Panel 
Meters,  Data  Acquisition  Systems,  Low  or  High  Level 
Transducer  Readouts,  and  others.  The  BCD  coded  outputs  of 
these  conveners  makes  them  ideal  for  use  when  a  digital 
readout  of  the  analog  signal  is  required  by  simple  addition  of 
necessary  decoder/driver  and  appropriate  display. 


Models  SS3535  and  SS3635  are  unipolar  2-  and  3 — digit  A/D 

converters  utilizing  "section  counting"  multiple  comparator 
technique.  Model  SS3638A  is  a  bipolar  3%  digit  A/D  converter 
with  true  differentia)  input  and  an  input  impedance  of 
1Q0M12!  Separate  overrange  and  overload  bits  provide  for 
extreme  simplicity  in  interfacing  with  any  digital  system. 
Models  SS3735  and  SS3735B  are  unipolar  and  bipolar  4— bit 
A/D's  respectively.  The  principle  of  "section  counting"  is 
employed  here  again  for  precise  conversion  down  to  ImV. 


OPERATIONAL  CHARACTERISTICS 


SPECIFICATION 


Inputs 

Analog,  Full  Range 
Digital,  Convert  Start 


SS3535 


0  to  +9.9V 

Pos.  Edge 


SS3B35 


0  to  +9 .99V 

Pos,  Edge 


SS3638A 


i  1.999V 
Pos.  Edge 


SS3735 


0  to  +9 .999V 
Pos.  Edge 


SS3735B 


±9 .999  V 
Pos,  Edge 


Input  Impedance 

Rin 

shunted  by  C,n 


10pF 


1  MO 
10pF 


1 


lOpF 


10K<> 
lOpF 


10KO 

lOpF 


10.08 V  (Nominal]" 


Internal  Reference 


Temperature  Range: 
Rated  Specification 

Operational 
Storage 


Power  Requirements 


+  15V  ±5%  at  BOmA 
♦15V  ±5%  at  24mA 
+5V±5%at2QQmA 


Dimensions  LxWxH 


4"  x  r  x  0.54" 


0°C  to  +70  C 
-25°C  to  +85  C 

-5S°Cto+100"C 


+  15V  r5%at40mA 
-15V  ±5%  at  15mA 
+5V  ±5%  at  180mA 


4"  x  2"  x  0.54" 


+15V±5%at45mA 
-15V  ±5%  at  45mA 
+5V  -5%  at  350mA 


3"  x  2"  x  0.54"  {2  units} 


SPECIFICATIONS  (TA=25°C  UNLESS  OTHERWISE  NOTED) 


SPECIFICATION" 

J  OJ  J  J  J 

SS3635 

SS3638A 

SS3735 

SS3735B 

Resolution  (Number  of  BCD  Digits) 

2 

!              3 

3+ Sign  Bit 
+  100%  Overramie 

4 

4  + Sign  Bit 

Cading 

8-4-2-1 

8-4-2-1 

8-4-2-1 

8-4-2-1 

8-4-2-1 

Conversion  Time 

50/jSec 

IGQMSec 

10mS  Full  Scale 
20mS  Full  Range 

200pSec 

200/iSec 

Linearity  in  percent  of  Full  Scale 
{at25°CJ 
(0  Cro+70'C) 

0.5 

0.5 

0.05 
0.075 

0.03 
0.05 

0.01 

0.035 

0.01 
0.035 

Zero  Offset  in  percent  of  Full  Scale 

0.5 

0.05 

D.05 

0.05 

0.05 

Scale  Factor  (Gain)  Error 
in  percent  of  reading 

0.5 

0,1 

0.1 

0.1 

0.1 

Ouantizing  Error  in  percent  of  reading 

0.5 

0.05 

0.05 

0.005 

0.005 

Zero  Drift  ?n  percent  of  Full  Scale 
per  X{0*Cto+7(fC} 

D.005 

0.002 

0.002 

0.001 

0.001 

Scale  Factor  (Gain)  Drift  in  percent  of 
reading  per  °C(0°C  to +70CC) 
with  internal  reference 
with  external  reference 

0.008 
0.005 

0.004 
0.002 

0.004 
0.002 

0.003 
0.001 

0.003 
0.001 

Long  Term  Stability  in  percent  of 
Full  Scale:  Per  1000  Hours 
Per  Year 

0.1 
0.3 

0.05 
0.1 

0.05 
0.1 

0.025 

0.05 

0.025 
0.05 

PRICE  LISTING 


Catalog 
Number 

Description 

14 

!      5-9 

10-24 

25-up 

Grouping 
Code 

95-02035 

Model  SS2035  0/A  Converter 

20.75 

19.75 

18.75 

17.75 

28 

95-02135 

Model  SS2135  D/A  Converter 

29.50 

28.25 

27.00 

25.75 

28 

95-02235 

Model  SS2235  D/A  Converter 

45.00 

43.00 

41.00 

39.00 

28 

95-02635 

Model  SS2B35  D/A  Converter 

38.00 

36.00 

34.00 

32.00 

'         28 

95-02735 

Model  SS2735  D/A  Converter 

65.00 

62.00 

59.00 

56.00 

28 

9503535 

Model  SS3535  A/D  Converter 

55.00 

52.00 

49.00 

46.00 

28 

95-03635 

Model  SS3635  A/D  Converter 

100.00 

96.00 

92.00 

88.00 

28 

95-13638 

Model  SS3638A  A/D  Converter 

80.00 

76.00 

72.00 

68.00 

28 

95-03735 

Modei  SS3735  A/D  Converter 

150.00 

144.00 

138.00 

132.00 

28 

95-23735 

Model  SS3735B  A/D  Converter 

190.00 

180.00 

170.00 

160.00 

28 

SOU®  STA7S  S '/S1TI1MS*  HBOC 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


ANTENNAS 


v 


ai 


D 


rush 


2  METER 

ANTENNAS 


Catalog 
Number 

Description 

Gain 

(dB) 

F/B 
(dB) 

Power 
Rating 



Wt 

(Lbs.) 

Fig* 

66-12022 

Gush-Craft  DX-120,  2B*Etement  OX  Array. 
Optimum  front  lobe,  easily  stacked, 
52  ohm. 

14.2 

20 

2KW 

n 
w 

u 

A 

66-14722 

Gush-Craft  A-147-1 1,  1 1  -Element  Yagi. 

Standard  of  comparison  in  UHF 
communications. 

13.2 

20 

1KW 

6 

8 

66-40022 

Cush  Craft  AFM4-D,4Pole. 

Overall  length  23',  4  complete  dipole 
assemblies  on  mounting  booms. 
All  hardware. 

180°=9 
360° =6 



1KW 

4 

c 

66-20022 

Cush  Craft  AR-2,  FM  Ringo. 

Ready  to  install  up  to  114"  O.D.  mast. 
The  most  popular  omnidirectional 
antenna. 

3.75 

100W 

2 

D 

66-14422 

Cush-Craft  A-1474, 4-Etement  Vagi. 

Rear  bracket  for  mast  or  tower 
side  mount  Boom  length  44". 

9 

20 

1KW 

3 

66-14122 

Cush  Craft  AM -147  T,  FM  Mobile, 

Professional  looking  fiberglass.  For 
roof  or  trunk  in  %tl  hole  with  15* 
RG-567U. 

3 

100W 

2 

66-14702 

Cush-Craft  A -147-22,  Power  Pack, 

The  big  signal  array.  Two  11 -element 
yagisand  complete  stacking  kit. 

16 

24 

1KW 

15 

aft 


BLITZ  BUG 

COAX     LIGHTNING   ARRESTER 

V,S.     FATtNT     2.923,913 
ADO  UP  THESE  BLITZ  BUG  FEATURES 

ft  Pa  ranted  Static  Ring       *   1   KW  Power  Handling 

"ft  Precision  Machined  *  No  Insertion  Lots 

*  Sealed  Air  Chamber  &  Good  to  600  mc, 

"fr  Constant  Static  Oram  *  Over  250,000  in  use 

ft  Controlled  Voltage  ''■'  Matched  to  your  equipment 


lac-1 


lac-2 


P  0   BOX  773 

SOU®  STTA?!  STOTiMS,  IIOQC.  Columbia.  Missouri  65201 


CITIZENS  BAND  ANTENNAS 


3  ELEMENT  8   DB  GAIN 


I 


FORWARD  GAIN 

FRONT  TO  BACK  RATIO 

VSWR 

BANDWIDTH 

ELEMENT  SPACING.. 

ELEMENT  DIAMETER 

TURN  RADIUS 

WEIGHT 


*  ■  ■  « 


.  .  .  r  •  •  . ,  o  db 

■     **■■**    i    LL   UU 

1  to  1 

. .  23  Channels 
. . . .  Optimum 
..11/2"x10' 
...3/4"- 1/2" 

5* 

10  lbs. 


66-32310 


RINGO 

3.75  DB  GAIN 

it  FULL  HALF  WAVE  ANTENNA 

&  POWER   RING   TUNING 

it  NO  DROOPING   RADIALS 

it  BETTER  RECEIVE  POWER 

it  GOOD  PORTABLE  OPERATION 

it   RING   DIAMETER   10" 

it  DIRECT  DC  GROUND 

it   LOW  ANGLE  OF   RADIATION 


66-32110 


4  ELEMENT  9.5  DB  GAIN 

FORWARD  GAIN 9.5  db 

FRONT  TO  BACK  RATIO 26  db 

W    UTI   fl        ■     m     m     »     *    m    m    ■    *     •    W     t    *    •    *    *    •'•    •    #    •    •'*    W    P    *    m     •      I       IU 

BANDWIDTH 23  Channels 

ELEMENT  SPACING Optimum 

BOOM 15/8"x16' 

ELEMENT  DIAMETER 3/4"  •  1/2" 

I  U  tlfl|     nnUIUv  *  <  i  t  f  r  •  t  *  t  #  *  t  <  >  *  *  *  *  •  •  *  t  o 

WEIGHT 14  lbs. 


66-32410 


Catalog 
Number 

Item 

1-4 

5-9 

10-24 

25-up 

Grouping 
Code 

66-12022 

Cush-Craft  DX-120,  2  Meter,  20  Element 

29.50 

28.02 

26.61 

25.27 

19 

66-14722 

Gush-Craft  A-147-1 1,  2  Meter,  11  Element 

17.95 

17.05 

16.19 

15.38 

19 

6640022 

Cush-Craft  AFM4-0,  2  Meter,  4-Pole 

42.50 

40.37 

38.35 

36.43 

19 

66-20022 

Cush-Craft  AR-2, 2  Meter,  FM  Ringo 

12.50 

11.87 

11.27 

10.70 

19 

66-14422 

Cush-Craft  A-147-4, 2  Meter,  4-Element 

v  J   ,i)   J 

9.45 

8.97 

8.52 

19 

66  14122 

Cush-Craft  AM-147-T,  2  Meter,  Mobile 

2655 

25.60 

24.32 

23.10 

19 

66-14702 

Cush-Craft  A-1 47-22, 2  Meter,  Power  Pak 

49.50 

47.02 

44.66 

42.42 

19 

66-13100 

Cush-Craft  LAC1  Blitz  Bug 

3.95 

3.75 

3.56 

3.38 

19 

66-13200 

Cush-Craft  LAC2  Blitz  Bug 

4.45 

4.22 

4.00 

3.80 

19 

66-32110 

Cush-Craft  CR-1,  CB,  Base  Ringo 

21.50 

20,42 

19.39 

18.42 

19 

66-32310 

Cush-Craft  CB-11,  CB,3-Element 

34.50 

32.77 

31.13 

29.57 

19 

66-32410 

Cush-Craft  CB-1 14,  CB,  4-Element 

44.50 

42.27 

40.15    | 

38.14 

19 

©U®  $TATO  SYSf  SMS,  BNC  co°l5mb7a%issojri  65201 


UNIVERSAL  DECADE  COUNTING  UNIT 


FEATURES: 


Fully  assembled  and  tested  Universal  Decade  Counting  Units  are  now  available  from  Solid  State  Systems  for  a 
variety  of  applications  such  as  Pulse  and  Frequency  Counters,  Digital  Clocks,  Remote  Displays,  Time  and  Position 
Measurements  and  many  other  applications.  Among  features  are: 


* 
* 

* 


Easy  to  read  7-Segment  LED  or  incandescent  filament  readout. 

Grouping  of  readouts  on  single  board  for  custom  designed  appearance. 

LED  and  filament  boards  interchangeable. 

Readout  board  plugs  or  solders  into  counter/driver  board  for  low  profile. 

Your  choice  of  1  to  6  decades  of  counter/driver,  latch  and  decoder/driver  on  a  single  PC  board  which  plugs 
into  edge  connector  with  0,156  centers. 

Tin  plated,  G-1Q,  glass  epoxy  PC  board  with  2  oz.  copper. 

All  counter /driver  boards  have  the  following  input/output  leads  available  (as  per  option): 

BCD  (binary  coded  decimal)  outputs  from  all  counting  stages 

Counter  reset  input 

Load  BCD  data  into  counter  (74192,  74196) 

Latch  strobe  input  (7475) 

Selectable  ripple  blanking  input/output  and  readout  lamp  test 

Selectable  decimal  point 

Will  operate  from  a  single  5  volt  TTL  compatible  power  supply. 


SEE  FOLLOWING  PAGE  FOR  ORDERING  INFORMATION  AND  PRICE  LISTING 


p  n  box  773 

SOW  STAVE  SYSTEMS,  IMC.  Columbia,  Missouri  652qi 


UNITS  WITH  7490  COUNTER 


TO  ORDER 


PLEASE  NOTE;  To  obtain  the  correct  Catalog 
Number,  replace  X  with  the  number  of  decades  you 
want  on  the  same  board.  For  Example:  11-49202  is 
the  correct  Catalog  Number  for  a  4-decade  counter 
with  74192,  no  latch,  and  LED  display. 


Desc 

ription 

Catalog 

Counter 

Latch 

Dbc./Df. 

Display 

Number 

7490 

™_— 

7447 

Filament 

11X9001 

7490 

7475 

7447 

Filament 

1 1X9051 

7490 



7447 

LED 

11X9002 

7490 

7475 

7447 

LED 

11X9052 

74192 

__ 

7447 

Filament 

11X9201 

74192 

7475 

7447 

Filament 

11X9251 

74192 

, 

7447 

LEO 

11X9202 

74192 

7475 

7447 

LED 

11X9252 

74196 

7447 

Filament 

11X9601 

74196 

7475 

7447 

Filament 

11X9651 

74196 

a-wr-  wm  mm 

7447 

LED 

11X9602 

74196 

7475 

7447 

LED 

11X9652 

Catalog 

Price  per  Unit 

Grouping 

Number 

14 

5-9 

10-24 

25-up 

Code 

11-19001 

13.00 

12.50 

12.00 

11.50 

18 

11-29001 

26.00 

25.00 

24.00 

23.00 

18 

11-39001 

39.00 

37.50 

36.00 

34.50 

18 

11-49001 

52.00 

50.00 

48.00 

46.00 

18 

11-59001 

65.00 

62.50 

60.00 

57.50 

18 

11-69001 

78.00 

75.00 

72.00 

69.00 

18 

11-19002 

15.00 

14.50 

14.00 

13.50 

18 

11-29002 

30.00 

29.00 

28.00 

27.00 

18 

11-39002 

45.00 

43.50 

42.00 

40.50 

18 

1149002 

60.00 

58.00 

56.00 

54.00 

18 

1 1-59002 

75.00 

72.50 

70.00 

67.50 

18 

1 1-69002 

90.00 

87.00 

84.00 

81.00 

18 

11-19051 

14.25 

13.75 

13.25 

12.75 

18 

11-29051 

28.50 

27.50 

26.50 

25.50 

18 

11-39051 

42.75 

41.25 

39.75 

38,25 

18 

1149051 

57.00 

55.00 

53.00 

51.00 

18 

11-59051 

71.25 

68.75 

66.25 

63.75 

18 

11-69051 

85.50 

82.50 

79.50 

76.50 

18 

11-19052 

16,25 

15.75 

15.25 

14.75 

18 

11-29052 

32.50 

31.50 

30.50 

29.50 

18 

11-39052 

48.75 

47.25 

45.75 

44.25 

18 

1149052 

65.00 

63.00 

61.00 

59.00 

18 

11-59052 

81.25 

78.75 

76.25 

73.75 

18 

1169052 

97.50 

94.50 

91.50 

83.50 

18 

UNITS  WITH  74192  COUNTER 


UNITS  WITH  74196  COUNTER 


Catalog 

Price  per  Unit 

Grouping 

Number 

14 

5-9 

10-24 

25-up 

Code 

11-19201 

14.00 

13.50 

13.00 

12.50 

18 

11-29201 

28.00 

27.00 

26.00 

25.00 

18 

11-39201 

42.00 

40.50 

39.00 

37.50 

18 

11 -49201 

56.00 

54.00 

52.00 

50.00 

18 

11-59201 

70.00 

67.50 

65.00 

62.50 

18 

11-69201 

84.00 

81.00 

78.00 

75.00 

18 

11-19202 

16.00 

15.50 

15.00 

14.50 

18 

11-29202 

32.00 

31.00 

30.00 

29.00 

18 

11-39202 

48.00 

46.50 

45.00 

43.50 

18 

1149202 

64.00 

62.00 

60.00 

58.00 

18 

11-59202 

80.00 

77.50 

75.00 

72.50 

18 

11-69202 

96.00 

93.00 

90.00 

87.00 

18 

11-19251 

15.25 

14.75 

14.25 

13.75 

18 

11-29251 

30.50 

29.50 

28.50 

27.50 

18 

11-39251 

45.75 

44.25 

42.75 

41.25 

18 

11-49251 

61.00 

59.00 

57.00 

55.00 

18 

11-59251 

76.25 

73.75 

71.25 

68.75 

18 

11-69251 

91.50 

88.50 

85.50 

82.50 

18 

11-19252 

17.25 

16.75 

16.25 

15.75 

18 

11-29252 

34.50 

33.50 

32.50 

31.50 

18 

11-39252 

51.75 

50.25 

48.75 

47.25 

18 

1149252 

69.00 

67.00 

65.00 

63.00 

18 

1 1-59252 

86.25 

83.75 

81.25 

78.75    ! 

18 

11-69252 

103.50 

100.50 

97.50 

94.50 

18 

Catalog 

Price  per  Unit 

Grouping 

Number 

1-4 

5-9 

10-24 

25-up 

Code 

11-19601 

13.75 

13.25 

12.75 

12.25 

18 

11-29601 

27.50 

26.50 

25.50 

24.50 

18 

11-39601 

41.25 

39.75 

38.25 

36.75 

18 

1149601 

55.00 

53.00 

51.00 

49.00 

18 

11-59601 

68.75 

66.25 

63.75 

61.25 

18 

11-69601 

82.50 

79.50 

76.50 

73.50 

18 

11-19602 

15.75 

15.25 

14.75 

14.25 

18 

11-29602 

31.50 

30.50 

29.50 

28.50 

18 

11-39602 

1      47.25 

45.75 

44.25 

42.75 

18 

11-49602 

63.00 

61.00 

59.00 

57.00 

18 

11-59602 

78.75 

76.25 

73.75 

71.25 

18 

1 1-69602 

94.50 

91.50 

88.50 

85.50 

18 

11-19651 

15.00 

14.50 

14.00 

13.50 

18 

11-29651 

30.00 

29.00 

28.00 

27.00 

18 

11-39651 

45.00 

43.50 

42.00 

40.50 

18 

1149651 

60.00 

58.00 

56.00 

54.00 

18 

11-59651 

75.00 

72.50 

70.00 

67.50 

18 

11-69651 

90.00 

87.00 

84.00 

81.00 

18 

11-19652 

17.00 

16.50 

1 6.00 

15.50 

18 

11-29652 

34.00 

33.00 

32.00 

31.00 

18 

11-39652 

51.00 

49.50 

48,00 

46,50 

18 

11-49652 

68.00 

66.00 

64.00 

62.00 

18 

11-59652 

85.00 

82.50 

80.00 

77.50 

1  O 

11-69652 

102.00 

99.00 

96.00 

93.00 

18 

S®»  STATE  SWUM!,  QffOC 


P  0  BOX  773 

COLUMBIA,  MISSOURI    65201 


PUSH-BUTTON  SWITCHES 


DESCRIPTION 

The  Series  LM  switches  are  new,  low-bounce  miniature 
mechanical  switches.  Switching  contact  is  achieved  by  moving 
a  gold  wire  beam  spring  into  the  vee  formed  by  the  conical 
points  of  the  two  gold-plated  contact  rods.  This  contact 
arrangement  simultaneously  combines  the  best  features  and 
proven  reliability  of  wiping  and  cross-point  contact.  The 
spring-on-spring  design  has  the  further  advantage  of  providing 
the  high  hysteresis  desired  in  modern  keyboard  switching. 

These  solder-mounted  switches  are  ideal  for  use  on  circuit 
boards  and  can  be  wave  soldered  along  with  the  other  circuit 
components.  The  keyswitch  solder  terminals  are  made  of 
gold-plated  beryllium  copper  which  provides  high-strength 
physical  attachment  to  the  board.  The  base  of  each  switch 
contains  plastic  alignment  studs  so  that  no  metal  alignment 
plates  are  required.  The  complete  keyboard  including  the 
printed  circuit  hoard  extends  only  V*  inch  below  the  enclosure 
panel  surface. 

These  reliable,  low-priced  units  are  designed  for  use  in 
hand-held  devices,  such  as  miniature  electronic  calculators. 
These  can  be  mounted  on  centers  as  close  as  one-half  inch. 

Switches  with  all  the  letters  of  the  alphabet,  numerals,  and 
calculator  functions  are  available.  All  numbers  are  white  on 
black  background,  while  others  are  black  on  white 
background.  Letter  "C"  for  calculators  is  supplied  in  red  on 
black  background; 

SPECIFICATIONS 

Electrical 

Contact  Form , SPST  -  N.Q,  momentary 

Contact  Rating  „  . , . . . , .  T  100  ma  @  24  vdc 

Contact  Bounce  , ,  * , . 2  milliseconds  max 

Operating  Rate  .•••;, . >  BO  cps 

Mechanical 

Plunger  Travel 0.070  ±  0.005  inch 

Pre-Travel , , 0.055  ±  0.020  inch 

Key  Actuation  Force  * . .  # , . 3,0  ±  0.5  oz  std 

Weight  . . . t # 1 .5  grams 

Environmental 

Operating  Temperature -10° C  to  +55ftC 

Operating  Humidity . 0  to  98% 

Storage  Temperature , -30°  C  to  +70°  C 

Life 

Minimum  Actuations  * *«*•*•.•*.••...*,  15  X  10 


PHYSICAL  CHARACTERISTICS 


p 


.400  SQUARE 


.350 


496  SQUARE 


.375 


.025  DIA  SOLDER  TABS 
.093  DIA  LOCATING  STUDS 


PRICE  LISTING 


Catalog 
Number 

49 

50 
99 

100- 
499 

500- 

999 

1000- 
up 

Grouping 
Code 

Choose  from 
Table  Below 

.45 

.41 

.37 

iV<J 

.29 

24 

LEGENDS  AVAILABLE 


Catalog 

Catalog 

Catalog 

Catalog 

Catalog 

Catalog 

Number 

Legend 

Number 

Legend 

Number 

Legend 

Number 

Legend 

Number 

Legend 

Number 

Legend 

65-32000 

"0" 

65-32101 

nr*t* 

65-32112 

"RM" 

65-32123 

"RESET" 

65-32207 

nr+tr 

65-32218 

"R" 

65-32001 

ttm  *t 

65-32102 

"CE" 

65-32113 

"CM" 

65-32124 

"STOP" 

65-32208 

IttlTf 

6532219 

"S" 

65-32002 

tiytt 

65-32103 

***** 

65-32114 

»0" 

65-32125 

"RUN" 

65-32209 

"|" 

65-32220 

T 

65-32003 

"3" 

65-32104 

MI         ft 

65-32115 

VX"  1 

65-32126 

"ENTER" 

65-32210 

"J" 

65-3222 1 

"U" 

65-32004 

»4» 

65-32105 

"V* 

65-32116 

ny2» 

65-32127 

"AUTO" 

65-3221 1 

"K" 

65  32222 

"V 

65-32005 

"5" 

65-32106 

ilj_t* 

65  32117 

"1/X" 

65-32201 

"A" 

65-32212 

"L" 

65-32223 

"W" 

65-32006 

ttQtf 

65-32107 

'*«" 

65-32118 

V 

65-32202 

"ft" 

65-32213 

"M" 

65-32224 

"X" 

65-32007 

ti-jrr 

65-32108 

"+   =" 

65-32119 

ttnftf 

6532203 

##p*r 

65-32214 

"N" 

65-32225 

rtyjt* 

65-32008 

"8" 

65-32109 

"            «** 

65-32120 

"ON" 

65-32204 

MD" 

65-32215 

"O" 

65-32226 

"Z" 

65-32009 

"9" 

65-32110 

"+M" 

65-32121 

"OFF" 

65-32205 

"E" 

65-32216 

"P" 

65-32100 

- 

65-32111 

"-M" 

65-32122 

"SET" 

65  32206 

"F" 

65-32217 

"Q" 

$mw  S7A7S  $Y$T1SIM$A  INC 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


ASSORTMENTS 


Assortments  of  most  wanted  electronic  components,  Resistors  and  Capacitors,  are  now  offered  in  counts  from  one 
each  up  to  ten  each  per  value.  Each  assortment  is  neatly  sealed  in  heavy  plastic  with  5  and  10  count  assortments 
already  seperated  by  value,  This  should  prove  extremely  valuable  in  keeping  a  close  control  over  inventories.  These 
assortments  are  ideal  for  use  in  R&D  Laboratories,  Schools  and  Universities,  and  for  Experimenters*  All 
components  are  brand  new  with  full  markings  and  per  specifications  listed  elsewhere  in  this  catalog. 

Each  assortment  offers  substantial  savings  over  individual  component  prices;  also,  for  the  first  time,  all  different 
assortments  may  be  combined  for  quantity  pricing. 


PRICE  LISTING 


Catalog 
Number 

Description 

M 

5-9 

10-24 

2  5 -up 

Grouping 
Code 

15-01310 

1  Each  of  167  Standard  5%,  14  Watt  Resistors 

12.50 

12.15 

11.50 

10.75 

17 

15-02310 

2  Each  of  167  Standard  5%,  !4  Watt  Resistors 

24.00 

22.75 

21.50 

20.50 

17 

15-05310 

5  Each  of  167  Standard  5%,  Y*  Watt  Resistors 

54.50 

51.50 

48.50 

45.50 

17 

15-10310 

10  Each  of  167  Standard  5%,  %  Watt  Resistors 

105.50 

100.25 

95.00 

89.75 

17 

15-01410 

1  Each  of  84  Standard  10%,  %  Watt  Resistors 

4.00 

3.80 

3.60 

3.40 

17 

15-02410 

2  Each  of  84  Standard  10%,  %  Watt  Resistors 

7.50 

7.13 

6.75 

6.38 

17 

15-05410 

5  Each  of  84  Standard  10%,  %  Watt  Resistors 

17.00 

16.15 

15.30 

14.45 

17 

15-10410 

10  Each  of  84  Standard  10%f  %  Watt  Resistors 

33.00 

31.35 

29.70 

28.05 

17 

15-01110 

1  Each  of  167  Standard  5%,  JS  Wan  Resistors 

12.50 

12.15 

11.50 

10.75 

17 

15-02110 

2  Each  of  167  Standard  5%,  16  Watt  Resistors 

24.00 

22.75 

21.50 

20.50 

17 

15-05110 

5  Each  of  167  Standard  5%,%  Watt  Resistors 

54.50 

51.50 

48.50 

45.50 

17 

15-10110 

10  Each  of  167  Standard  5%,  %  Watt  Resistors 

105.50 

100.25 

95.00 

89.75 

17 

15-01210 

1  Each  of  84  Standard  10%,  %  Watt  Resistors 

4.00 

3.80 

3.60 

3.40 

17 

15-02210 

2  Each  of  84  Standard  10%,  %  Wan  Resistors 

7.50 

7.13 

6.76 

6.38 

17 

15-05210 

5  Each  of  84  Standard  10%f  %  Wan  Resistors 

17.00 

16.15 

15.30 

14.45 

17 

15-10210 

10  Each  of  84  Standard  10%,  %  Watt  Resistors 

33.00 

31.35 

29.70 

28.05 

17 

15-01750 

1  Each  of  50  Type  5GA  Ceramic  Disc  Capacitors 

4.00 

3.80 

3.60 

3.40 

17 

15-02750 

2  Each  of  50  Type  5G A  Ceramic  Disc  Capacitors 

7.50 

7.13 

6.75 

6.36 

17 

15-05750 

5  Each  of  50  Type  5GA  Ceramic  Disc  Capacitors 

17.00 

16.15 

15.30 

14.45 

17 

15-10750 

10  Each  of  50  Type  5G  A  Ceramic  Disc  Capacitors 

33.00 

31.35 

29.70 

28.05 

17 

15-01715 

1  Each  of  15  Type  5HK  Ceramic  Disc  Capacitors 

1.75 

1.67 

1.58 

1.49 

17 

15-02715 

2  Each  of  15  Type  5HK  Ceramic  Disc  Capacitors 

3.50 

3.33 

3.15 

2.98 

17 

15-05715 

5  Each  of  15  Type  5HK  Ceramic  Disc  Capacitors 

8.00 

7.60 

7.20 

6.80 

17 

15-10715 

10  Each  of  15  Type  5HK  Ceramic  Disc  Capacitors 

15.00 

14.25 

13.50 

12.75 

17 

15-01707 

1  Each  of  7  Type  TG  Ceramic  Disc  Capacitors 

1.00 

0.95 

0.90 

0.85 

17 

15-02707 

2  Each  of  7  Type  TG  Ceramic  Disc  Capacitors 

1.90 

1.81 

1.71 

1,62 

17 

15-05707 

5  Each  of  7  Type  TG  Ceramic  Disc  Capacitors 

4.50 

4.28 

4.05 

3.83 

17 

15-10707 

10  Each  of  7  Type  TG  Ceramic  Disc  Capacitors 

8.50 

8.08 

7.65 

7.23 

17 

15-01407 

1  Each  of  7  Type  UK  Ceramic  Disc  Capacitors 

1.30 

1.24 

1.17 

1.11 

17 

15-02407     | 

2  Each  of  7  Type  UK  Ceramic  Disc  Capacitors 

2.40 

2.28 

2.16 

2.04 

17 

15-05407 

5  Each  of  7  Type  UK  Ceramic  Disc  Capacitors 

6.00 

5.70 

5.40 

5.10 

17 

15-10407 

10  Each  of  7  Type  UK  Ceramic  Disc  Capacitors 

11.00 

10.45 

9.90 

9.35 

17 

15-01749 

1  Each  of  49  AXIAL  Electrolytic  Capacitors 

11.00 

10.50 

10.00 

9.50 

17 

15-02749 

2  Each  of  49  AXIAL  Electrolytic  Capacitors 

21.00 

20.00 

19.00 

18.00 

17 

1505749 

5  Each  of  49  AXIAL  Electrolytic  Capacitors 

50.00 

47.00 

44.00 

41.00 

17 

15-10749 

10  Each  of  49  AXIAL  Electrolytic  Capacitors 

95.00 

90.00 

85.00 

80.00 

17 

15-01849 

1  Each  of  49  RADIAL  Electrolytic  Capacitors 

11.00 

10.50 

10.00 

9.50 

17 

15-02849 

2  Each  of  49  RADIAL  Electrolytic  Capacitors 

21.00 

20.00 

19.00 

18.00 

17 

15-05849 

5  Each  of  49  RADIAL  Electrolytic  Capacitors 

50.00 

47.00 

44.00 

41.00 

17 

15-10849 

10  Each  of  49  RADIAL  Electrolytic  Capacitors 

95.00 

90.00 

85.00 

80.00 

17 

®IW  STTAITE  SYSTEMS,  DNC 


P.O.  BOX  773 

COLUMBIA,  MISSOURI    65201 


INTRODUCING-  UPEC 


® 


UNIT  PACKAGED  ELECTRONIC  COMPONENTS  ARE  NOW  BEING 
OFFERED  BY  SOLID  STATE  SYSTEMS,  INC.  THESE  INDIVIDUALLY 
PACKAGED  IC'S  ARE  ENCASED  IN  PLASTIC  AND  DISPLAYED  ON 
COLOR-CODED  CARDS  FOR  EASE  OF  SELECTION.  THE  CARDS 
HAVE  PREDRILLED  HOLES  FOR  DISPLAYING  ON  A  PEG-BOARD  OR 
RACK,  AND  INCLUDE  A  DIAGRAM  ON  THE  REVERSE  SIDE  SHOWING 
THE  ELECTRICAL  CHARACTERISTICS  OF  EACH  INDIVIDUAL  PART. 
FIRST  RUN  LINEAR,  DIGITAL  AND  SCHOTTKY  DEVICES  ARE  NOW 
AVAILABLE  AND  A  WIDE  RANGE  OF  CERAMIC  DISC  AND 
ELECTROLYTIC  CAPACITORS,  RESISTORS,  LED  READOUTS  AND 
OTHER  COMPONENTS  WILL  SOON  BE  OFFERED.  IF  YOU  ARE 
INTERESTED  IN  THE  POSSIBILITY  OF  STOCKING  THESE  ITEMS  IN 
YOUR  STORE,  UNIVERSITY  OR  HOME;  OR  PERHAPS  STARTING 
YOUR  OWN  BUSINESS  AND  WOULD  LIKE  TO  HAVE  COMPLETE 
INFORMATION,  PLEASE  CONTACT  CHRIS  ADAMS,  RETAIL  SALES 
SUPERVISOR,  AT  800-325-2982  {TOLL  FREE)  OR  WRITE  TO  THE 
ADDRESS  LISTED  BELOW. 

TOTEMS  INC. 


9 


P.  O.   BOX  773 


COLUMBIA.  MISSOURI  652Q1 


^^^-* 


CW  or  RTTY,  whichever  way  you  go, 

HAL  HAS  TOP  QUALITY 

YOU  CAN  AFFORD! 


TOP  QUALITY  RTTY... WITH  THE  HAL 

MAINLINE  ST-6  TU.  Only  7  HAL  circuit  boards 
(drilled  G10  glass)  for  all  features,  plug-in  IC  sockets,  and 
custom  Thordarson  transformer  for  both  supplies,  115/ 
230  V,  50-60  Hz.  Kit  without  cabinet,  only  $135.00;  screened, 
punched  cabinet  with  pre-drilled  connector  rails,  $35.00; 
boards  and  complete  manual,  $19.50;  wired  and  tested 
units,  only  $280.00  (with  AK-1,  $320.00).* 


OTHER  HAL  PRODUCTS  INCLUDE: 

ID-1  Repeater  Identifier  (wired  circuit  board) . 
ID-1  (completely  assembled  in  1Va"  rack 

cabinet)  ...,*<»* 

HAL  ARRL  FM  Transmitter  Kit 
W3FFG  SSTV  Converter  Kit 

Mainline  ST-5  TU  Kit 

Mainline  AK-1  AFSK  Kit 

HAL  RT-1  TU/AFSK  Kit 


$  75.00* 

$115.00" 
$  50.00* 
$  55.00* 
$  50.00* 
$  27,50* 
$  51.50* 


TOP  QUALITY. .  .WITH  THE 
HAL  15S0  ELECTRONIC 
KEYER.  Designed  for  easy  opera- 
tion; perfectly  timed  CW  with  optional 
automatic  ID  for  sending  call  letters, 
great  for  DX  and  RTTY;  TTL  circuitry, 
transistor  switching  for  grid  block, 
cathode  keying.  Handsome  rugged 
crackle  cabinet  with  brushed  alumi- 
num panel.  With  ID,  only  $90.00;  with- 
out ID,  $65,00.* 


TOP  QUALITY... 
WITH  THE  HAL 
MKB-1  MORSE  KEYBOARD, 

As  easy  as  typing  a  letter— you  get 
automatic  CW  with  variable  speed 
and  weight,  internal  audio  oscillator 
with  volume  and  tone  controls,  in- 
ternal speaker,  and  audio  output  jack. 
Smooth  operation;  completely  solid- 
state,  TTL  circuitry  using  G10  glass 
boards,  regulated  power  supplies, 
and  high  voltage  transistor  switch. 
Optional  automatic  ID  available.  As- 
sembled MKB-1 ,  $275,00;  in  kit  form, 
$175.00,  * 


NEW  FROM  HAL  -  TOP  QUALITY 
RVD-1002  RTTY  VIDEO  DISPLAY 
UNIT.  Revolutionary  approach  to  amateur 
RTTY  . , .  provides  visual  display  of  received 
RTTY  signal  from  arty  TU,  at  four  speeds  (80,  66, 
75,  and  100  WPM),  using  a  TV  receiver  modified 
for  video  monitoring.  Panasonic  solid-state  TV 
receiver /monitor,  or  monitor  only,  available. 
RVD-1002,  $525.00;  Panasonic  TV  receiver/ 
monitor,  $160.00;  monitor  only,  $140.00.* 


TOP  QUALITY... WITH  THE  HAL  RKB-1 
TTY  KEYBOARD.  Gives  you  typewriter-easy  op- 
eration with  automatic  letter/number  shift  at  four 
speeds  (60,  66,  75,  and  100  WPM).  Use  with  RVD-1002 
video  display  system,  or  insert  In  loop  of  any  tele- 
printer, tor  fast  and  easy  RTTY.  Completely  solid  state, 
TTL  circuitry  using  G10  glass  boards,  regulated  power 
supplies,  and  transistor  loop  switch. 
RKB-1  assembled,  only  $275.00.* 


HAL  provides  a  complete  line  of  components, 
semi-conductors,  and  ICs  to  fill  practically  any  construction 
need.  Send  $.24  to  cover  postage  for  catalog  with  info  and 
photos  on  all  HAL  products  available. 

*  Above  prices  do  not  include  shipping  costs.  Please  add  $.75 
on  parts  orders,  $2.00  on  larger  kits.  Shipping  via  UPS 
whenever  possible;  therefore,  street  address  required. 


wtr 


BankAmericard 


uttffomt  fif'M 


master  charge 

THE  iHTEPlftAWK  CARD 


HAL  COMMUNICATIONS  CORP.,    Box  365  L  .  Urbana,  Illinois  61801 


The  Most  Powerful  Antennas  Under  the  Sun 


tJOrafa* 


am 


DuoBand  Does  It  Best! 

20  AND  40  METERS 


8.1  db  gain  on  20  Meters! 
4.9  db  gain  on  40  Meters! 
Maximum  legal  power! 


The  Hy-Gain  DB-24B  is  the  top  combination  for  top  perfor- 
mance on  20  and  40  meters.  Uses  three  full-sized  elements 
on  20  meters  and  two  2/3  size  elements  in  conjunction  with 
Hy-Gain's  perfected  linear  loading  on  40  meters.  Unique 
linear  decoupling  stubs  make  two  band  operation  possible 
without  inductance  and  capacity  traps.  Feeds  with  52  ohm 
coax  and  is  equipped  with  balun  and  Beta  Match  for  opti- 
mum energy  transfer.  F/B  Ratio:  20  meters,  20-30  dtp;  40 
meters,  10-20  db.  Boom  length  24  ft.,  longest  element  43  ft., 
maximum  input  1  kw,  AM. 

DB-24B. ..for  top  duoband performance! 


Order  No.  396 


$1 99.95 


HY-GAIN  ELECTRONICS  CORPORATION 

Dept.CM,  8601  Northeast  Highway  Six,  Lincoln,  NE  68507 
402/464-91 51  Telex  48-6424 


178 


73  MAGAZINE 


Don't  settle  for  second.  Get  the  best... 


Antennas! 


TH6DXX 

6-Element  Super  Thunderbird  DX 
Superior  Performance  TriBander! 


Impressive  coverage  10-15-20  meters. 
Separate,  improved  Hy-Q  traps  for 
each  band,,.  SWR  less  than  1.5:1  on 
all  bands.  Takes  maximum  tegal  power, 
up  to  1  kw  AM,  2  kw  PEP.  Exclusive 
Beta  Match.  Factory  pre-tuned,  Feeds 
with  52  ohm  coax. 


$189.95 


. 


* 


«r  [ 


TH3Mk3 

3-Element  Super  Thunderbird  Popular  TriBand  Beam  Im- 
proved! 

Outstanding  performance  10-15-20  meters  at  reasonable  cost.  Separate, 
matched  Hy-Q  traps  for  each  band.  Exclusive  Beta  Match  for  tapered  im- 
pedance, DC  ground.  SWR  less  than  2:1  at  resonance.  Accepts  maximum 
legal  power  and  feeds  with  52  ohm  coax. 

$1 54.95 

1 8  AVT/ WB 

The  Great  Wide  Band  Vertical  Super  Performer  80  through 
10  meters! 

Superb  omnidirectional  capabilities.  Automatic  band  switching.  Beefed- 
up  Hy-Q  traps.  Top  loading  coil.  True  1/4  wave  resonance  on  all  bands. 
SWR  2:1  or  less  at  band  edges.  Outstanding  low  radiation  pattern.  En- 
tirely self-supporting. 

_  $79.95 

18  HT 

Incomparable  Hy-Tower    Finest  Multiband  on  the  Market! 

Automatic  band  selection  80  through  10  meters.  Unique  stub  decoupling 
system  isolates  electrical  1/4  wavelengths  for  each  band.  Takes  maximum 
legal  power.  Feeds  with  52  ohm  coax.  24'  tower  is  entirely  self-support- 
ing, virtually  indestructible.  Requires  only  4  sq.  ft.  for  installation. 

$219.95 

GECC  revolving  credit  available 
Use  your  BankAmencard  or  Master  Charge 


ELECTRONIC  DISTRIBUTORS,  INC 

•  Communications  specialists  for  over  35  years. 
1960  Peck  Street  Muskegon,  Ml    49441     616/726-3196    Telex  228-411 


DECEMBER  1973 


179 


^E   CALCULATOR    k^KAd 

Attractively  designed! 1 1  Excellent  craftsmans 

Case  and  keyboard  (designed  as  one  unit} , 

Cabinet  is  made  oY  high- impact  plastic 

beige  color  with  black  bezel  and 

amber  window.  Keyboard  consists 

of  a  3  position  slide  switch  and 

25  Keys,  S  of  which  are  used  for 

memory  function-  20  keys  gray,  5 

keys  orange.  All  keys  mounted  on 

one  printed  circuit  board.*..*.. 


11"  wide  X  10.5"  X  2.9"  high 


This  modular  unit  is  well 
suited  for  our  calculator 
chips. Ideal  for  the  CT50Q5 

Case  and  keyboard  complete 

only  $29.95 


3  CHIP  CALCULATOR 

This  calculator  set  provides  all  of 
the  electronics  for  an  eight  digit, 
floating  point  calculator  with  left 
hand  entry.  Keyboard,  display, clock 
generator,  and  display  driver  is  all 
that  need  be  added  to  make  a  calcu- 
that  will  add,  subtract,  multiply, 
and  divide.  Overflow  and  negative 
signals  are  also  provided*  Complete 
instructions  to  build  a  calculator 
included 


Chips  and  data—- — -j$7 

Data  only 1 

(refundable) 
if 


95 

00 


J 


CT5005  CALCULATOR! 


This  calculator  chip  has  a  full  four 
function  memory,  which  is  controlled 
by  four  keys,  +M  (adds  entry  into  me* 
mory) ,  ^M  (subtract  entry  from  memo- 
ry) ,  CM  (clear  memory —without  clear- 
ing rest  of  registers) ,  RM  (read  me- 


ory  or  use  as  entry) . 


12  digit  display  and  calc. 

fixed  decimal  at  0,1,2, 3,4 f   or  5 

leading  zero  suppression 

seven  segment  multiplexed  output 

true  credit  sign  display 

single  2Q   pin  chip 

Chip  and  data $14.95 

Data  only  (refundable) 1.00 


5001      CALCULATOR 

40  pin  calculator  chip  will  add. sub- 
tract, multiply,  and  divide,  12  digit 
display  and  calculate,  Chain  calcula- 
tions. True  credit  balance  sign  out- 
put. Automatic  overflow  indication. 
Fixed  decimal  point  at  0,  2,  3,  or  4 
Leading  zero  suppression.  Complete 
data  supplied  with  chip. 

Chip  and  data,  only  59.95 
Data  only  (refundable)  SI* 00 


All  IC's  are  new  and  fully  tested; 
leads  are  plated  with  gold  or  solder 
Orders  for  $5  or  more  will  be  ship- 
ped prepaid.  Add  35C  for  handling  and 
postage  for  smaller  orders, residents 
in  California  add  sales  tax.  TC  or- 
ders are  shipped  within  two  workdays 
of  receipt  of  order -kits  are  shipped 
withen  ten  days  of  receipt  of  order, 
$10,00  minimum  on  C.O.D.^Mphone  inj  , 
(916)  9662111        Zip--95608 

P.O.  Box  J 
Carmichael 
California 
BACK  GUARANTEE  ON  ALL  GOODS . . . 


r 


keyboard  General 
Telephone  \ 


Ten  push  buttons  (0-9 
touch- tone,  encoding, 
programming   devices. 
Easy  for  panel  mount- 
ing, Size 


:  3X£HX1"| 


MEMORY  SALE!! 

256x1  BIT  Random  Access  Memory 


Fully  decoded TTL  Compatible 

input  and  output,  No  clock  or 
refresh  required. 

INTEL  1101  MOS 

16  pin  DIP-full   data         O  CO 
U  per  BIT-—-   each  £.OQ 

10  for$22»56 


7400 

series 

DIP 

7400     $ 

.35 

74H5  3 

♦  50 

74H00 

.50 

7454 

.35 

7401 

.35 

74L54 

.50 

74  HOI 

.50 

74L55 

.50 

7403 

.35 

7450 

.35 

7404 

.35 

74L71 

,30 

74L04 

.50 

7472 

.50 

74H04 

.50 

74L72 

.60 

7405 

.35 

7473 

.65 

74H0S 

.50 

74L73 

.90 

74H08 

.so 

7474 

.65 

7410 

.35 

74L74 

.90 

74L10 

.50 

74H74 

.90 

74K11 

,60 

7476 

.70 

7413 

1.75 

74L7B 

1  ,00 

7420 

,35 

7400 

.65 

^4L20 

.50 

7483 

1.30 

74H20 

.50 

7496 

,B0 

74H22 

.60 

7430 

.35 

74L3Q 

,50 

7491 

1.15 

7440 

,35 

7492 

1.15 

74H40 

.50 

7493 

1.15 

7441 

1.60 

7495 

1.25 

7442 

1.30 

74L95 

2.00 

7446 

1,75 

74107 

,70 

7447 

1.75 

74121 

1.60 

7448 

1.15 

74123 

2.00 

7450 

.35 

74154 

2.50 

74H50 

.50 

7451 

.35 

74192 

2.50 

74L51 

.50 

74193 

1.50 

74H51 

.50 

74195 

1-10 

7453 

.35 

RECTIFIERS 

Vara  Bridges 

VS447  2A  400V    $  .90 

VS647  2A  600V  .  ^  1.10 


1-10 


.10 
.10 

.11 

,12 
.13 


"f 


3SA  Stud  400V 


MRS  10 

1N4997 

1N4G01 

1N4002 

1N4003 

1N4004 

1N4O07 


50V  1A 
50V  1A 
1A 
1A 
1A 
1A 
LA 


SCffs 


IR122 
IR122 
IR122 
IR122 


100V  SAMP  -50 
200V  SAMP  *G0 
300V  8AHP  -80 
400V  SAMP  1-00 


LcDs  $  .25 

MV-50  red  emitting  10-4Gma@2V  5  for  1,00 

MV5054  red  LED  15-lQ0ma@2V  $    .30 

(   ZjL— -         10  for  2.50 

^&h—* —  $  .30 

HV-10B  Visible  red  5-70ma  13  2V  10  for  2,50 


ft , 


II 


GIANT  NIXIE 

Comes  complete  with  Socket  and  DD700  202 
Numeric  Driver,  Readability  in  high  am- 
bient light... 200  footlamberts  bright- 
ness!! All  DC  operation.  Long  life  with 
no  loss  of  brightness.  Compatible  with 
conventional  solid  state  circuitry. 


Only  $2.25 


These  were 
used  in  the 
New  York 
Stock  Ex- 
change 


HCfl  2QIQ  NUKUTHDN 

Popular  digital  display  tube. 
This  incandescent  five  Volt# 
seven  segment  device  provides 
a  .6"  high  numeral  which  can 
be  seen  from  a  distance  of  30 
feet.  The  tube  has  a  standard 
nine  pin  base  (solderable)  and 
a  left  hand  decimal  point* . , . 


$5*00  each 


$4.00  each  for  5  or  more 


Bflwi 


Seven  Segment* 0-9  plus  letters. 
Snaps  in  14-pin  DIP  socket  or 
Mo lex.  operates  with  IC  voltage 
requirements. Long  operating  life 

$4.25  each 


iwm 


Seven  segment ,0-9  plus  letters. 
Right  hand  decimal  point.  Snaps 
in  14-pin  DIP  socket  or  Molex. 
IC  voltage  requirements.  Ideal 
for  desk  or  pocket  calculators! J 


t q cn .*.k.*»..^     J ■  U L' 

Ten  or  more . . $  25 . 00 


red  lens 


iriflraa 


0-9  plus  letters.  Right  hand 
decimal  point. Flat-Pack  type 
case. Long  operating  life,  IC 
voltage  requirements.  Ideal 
for  pocket  calculators 


i  i  i  ■  i 

■  *  fc  m     i 


Each *  $  2 .  50 

Ten  or  more. ,$20.00 


LINEARS 

NE531 

op  amp  TO- 5 

$2.00 

NE560 

phase  lock  loop  DIP 

3.25 

NE561 

phase  lock  loop  DIP 

3.25 

NE565 

phase  lock  loop  TO-5 

3.25 

ME  566 

function  generator  TO -5 

4.00 

NE567 

tone  decoder  TO-5 

4*00 

NE5556 

op  amp  DIP 

1.00 

709 

popular  op  amp  DIP 

.45 

710 

voltage  comparator  DIP 

,50 

711 

dual  comparator  DIP 

.40 

723 

precision  voltage  regulator  DIP 

1.00 

747 

dual  741  op  amp  DIP 

1.00 

74B 

op  amp  TO-5 

1.00 

LM100 

positive  DC  regulator  TO-5 

1,00 

LM302 

op  amp  voltage  follower  TO-5 

1.25 

£iMl595 

4  quadrant  multiplier 

?2.00 

LM311 

comparator  TO-5 

1.75 

LM380 

2W  audio  amp  DIP 

1.75 

LM703 

RF-IF  amp  epoxy  TO-5 

1.00 

LM309H 

5V-200ma  power  supply  TO-5 

1.00 

LM309K 

5V-1A  power  supply  module  TO -3 

2*00 

Venus 


Ao-Zcon  TV  monitor 


CAMERA 
ADAPTER 

Mounting 
Bezel 


PERSONALIZED 

IDENTIFICATION 
PLATE 

Your  call  sign 


CABINET 

Zinc  Die 

Cast  Front 

with  Exkuded 

Alum  Sides 

10*4  "Wx  13"D 

xSVHt, 


OPTIMUM 
PICTURE 

3Y4"x3Ys,r 

for  POLAROID 

LAND  reproduction 


BRIGHTNESS 

Automatic 
CRT  Burn 
Prelection 


CONTRAST 

Independent 

Contrast 

Control 


SOURCE 
SELECT 

Rec„  Tape, 

Camera  Off 

&  Instant  On 


TILT 
STAND 

Collapsible 
Bail 


RE-SCAN 

Retrace 
Vertical 


Actual 
unretouched 
photo  taken 
from  the 
Venus  SS2 

nga 
Polaroid 
Color  Pack  it 
Camera  mounted 
on  the  Venus 
P-l  Camera 
I  Adapter 


ACCU  SYNC 
Diagnostic  and 
Tuning  Aid 


CAMERA  ADAPTER  P-1  enables 
you  to  take  photographs  "right-off-the- 
air+ and  accepts  a  Polaroid  Color  Pack 
or  a  Polaroid  Square  Shooter. 

•  Allows  photographing  in  a  lit  room 

»  Simple-snap  mounting  for  quick  and 
accurate  picture  taking 

•  Simultaneous  hood  viewing  of  picture 
being  taken  by  camera 

»  Instant  QSL  via  SSTV 

•  AmaL  Net  $345D 


THE 

OLAROID 
COLOR 
PACK 


VENUS 

vnMcKA 

ADAPTER 
P-1 


VENUS 
SLO  SCAN 

MONITOR 


FRAME 
GRABBER 

Venus'  Cassette  F  and  T  Senes  are 
continuous  loop  cassettes  tnat  allow  you  to 
easily  pre-record  and  send  SSTV  information 

F1  Singfe  frame  cassette  AmaLNet  *375 
TG  Gm^Sc*/eG#rtefamr^ma(_pijg|  igso 
TC  Checkerboard  Amat.Net  s650 


V1  VIEWING  HOOD 

Uniquely  designed  for  wide  angle 
viewing  by  more  than  one  operator. 

Amat.Net 

S|450 


Coming  in  December 
CAMERA  AND 
SCAN  CONVERTER 
CC-1 

Projects  your  VIDEO 
real  time  on  any 
conventional  home  TV 
while  simultaneously 
scan  converting  to  SSTV 

•  Full,  hall  and  quarter 
frame 

•  Positive,  negative 
reversal 

•  RF  output  for  viewing 
on  conventional  home 
TV  set 


ORDER  DIRECT  FROM  FACTORY 


Venus  Scientific  Inc. 

The  company  thai  put  high  voltage  on  the  moon,  now  tjrmgs  you  expanding  amateur  radio  technology. 


399  Smith  Street 
Farmingdale,  N.Y.  11735 
Phone  516-293-4100 
TWX  510-224-6492 


DECEMBER  1973 


181 


own 


I 


GOOD 


* 


...  By  having  your  Inoue  dealer  wrap  up  one  of  these  goodies  for 
Christmas  .  .  .  you'll  be  taking  home  one  of  the  finest,  most  advanced 
pieces  of  2- meter  FM  gear  available  today  .  .  .  ! 

FOR  EXAMPLE  .  , .  Up-grade  your  station  with  the  advanced  generation  4  Inoue  IC-230  .  .  ,  with  Inoue's 
unique  67+  channel  Phase  Locked  Loop"  synthesized  system  .  .  .  and  not  a  xtal  to  buy  •  .  .  Imagine! 
.  >  .  67+  channels  of  rugged  (all  modular  construction  .  .  .  servicing  is  a  snap— in  and  out)  communications 
ability  ...  so  compact  (2.3"  x  6.1"  x  9.7")  that  you  can  snap  it  in  and  out  of  the  smallest  places  (compact 
car,  brief  case,  or  apartment  book  shelf)  * . .  For  a  few  bucks  more,  you're  getting  67+  channels  of  one  of 
the  most  advanced  pieces  of  2-meter  gear  available  today  .  .  .  the  Inoue  IC-230  @  $489  .  ,  , 

Let  Santa's  Little  Helper  fill  your  Christmas  Stocking  by  seeing  ,  .  .  or  writing  your  nearby  I  COM  dealer 
today  .  .  «  and  see  the  entire  family  of  inoue's  unique  and  advanced  FM  gear  .  .  .  time's  a  wasting . ,  / 


Distributed  by: 


aicoM 


—  Dealerships  Available  — 


ICOMWEST,  INC. 

Suite  232  -  Bidg,  II 
300-  120th  Ave.  N.E, 
Bellevue,  Wash.  98005 
(206)  454-2470 


ADIRONDACK 
RADIO  SUPPLY 

185  West  Main  Street 
Amsterdam.  fSLY.  12010 


ICOM  EAST 

Div  ACS,  Inc. 
Box  331 

Richardson,  Tex.  75080 
(214)  235-0479 


182 


73  MAGAZINE 


Get  the  entire  Inoue  ICOM  family 
at  one  of  the  dealers  listed  below: 


ALABAMA 

Wolfe  Electronics 

Box  350 

Foley,  AL   36535 

ARKANSAS 

Gavin  Electronics 

516  R'dgeway 

Utile  Rock;  AR    72205 

ARIZONA 

Ell  Dee  Enterprises 

12612  N.  28th  Or 

Suite  3 

Phoemx,  AZ  85029 

CALIFORNIA 

Alpha  Sound 

1405  Dry  Creek  Road 

Sao  Jose,  CA  95125 

CDS  Electronics  &  Hobbies  Unlul 
235  Mitchell  Drive 
Atwater.  CA   95301 

Communications  Headquarters,  Inc. 
930  W   Washington  Street 
Sao  Diego,  CA   92103 

Electro  Service 

240  Mam  Street 

San  Mateo,  C A   94401 

Gary  Radio,  Inc 

8199  Ciairemont  Mesa  Blvd. 

San  Diego.  CA   921 1 1 


Henry  Radio  Company 
11240W.  Olympic  Blvd. 
Los  Angeles,  CA  90064 

Henry  Radio  Company 
931  N.  Euclid  Avenue 
Anaheim,  CA  92801 

Select  ran  ics 

1709  Markston  Road 

Sacramento,  CA  95825 

Sequoia  Stereo 
773  -  8th  Street 
Arcadia,  CA   95521 

Sichel  Equipment  Co. 
245  E.  Harris  Avenue 
S,  San  Francisco,  CA   94080 

Westcom  Engineering  Co 
Box  1020 
Escondido,  CA  92025 

COLORADO 

C  W,  Electronics  Sates  Co. 
1401  Blake  Street 
Denver.  CO  80202 

LEC  Electronics 

P.O.  Box  7515 

Pueblo  West,  CO  81007 

FLORIDA 

Amateur  Electronic  Supply 
621  Common  wealth 
Orlando,  FL   32803 

IES  —  Amateur  Division 
8817  S.W,  I29rh  Street 
Miami,  FL   33165 

Tony's  Radio 

1159  N  W   46th  Avenue 

LauderrulL  FL  33313 


GEORGIA 

Bright  Electron 
Box  76165 
Atlanta,  GA   30328 

ILLINOIS 

Erickson  Communications 
4653  Ravenswood 
Chicago,  IL   60640 

INDIANA 

Story  Etectrtc 
2039  Fairfield  Ave. 
Fort  Wayne,  IN 

Story  Electric 
441  Walnut 
Wabash  /IN  46992 

KENTUCKY 

T,  Zach  Bruce 

P.O.  8ox  724 

Mi   Sterling,  KY   40353 

MARYLAND 

COM  Electronics 
900  Cram  Hwy   S.W 
Glenn  Burmn.  MD   21061 

MEXICO 

NOVO  Me* 
Antonio  de  Mendoza 
M°320  Lamas 
Mexico  10.  cU.,  Mexico 

MONTANA 

Conley  Radio  Supp 
405  North  24fh 
BilUngs.  MT   59101 

Electric  City  Radio  Supply 
2315  -  10th  Avenue  5. 
Great  Falts,  MT 

NEVADA 

WJson  Electronics 

Box  794 

Henderson,  NV   89105 

NEW  MEXICO 

Robert  Foster 
Box  198  -  Star  Rt. 
Tijeras,  NM  87059 

NEW  YORK 

R.E,  Nebel  Laboratories 
31  Whitehall  Blvd. 
Garden  Cityp  NY    1 1530 

Barry  Electronics 

512  Broadway 

New  York,  NY    10012 

NORTH  CAROLINA 

Everhart  Electronics 
1 16  Sydney  Street 
Lexington,  NC   27292 

Vickers  Electronic  Supply 
506  E    Mam  Street 
Durham,  NC   27701 

CHIQ 

Amateur  Electronic  Supply 
17929  Euclid 
Cleveland,  OH   44112 

H  &  C  Electronics 
6271  Hamme II  Avenue 
Cincinnati,  OH  45237 


OKLAHOMA 

Bracks  Radio  Company 
413  NrE.  38ih  Terrace 
Oklahoma  City,  OK   73106 

Roland  Radio  Company 
5923  E.  31  *»  Street 
Tulsa,  OK    74114 

OREGON 

Portland  Radio  Supply 
1234  S.W,  Stark 
Portland,  OR   972G5 

PENNSYLVANIA 

Ham  tr  on  res 

4033  Brownsville  Rd, 

Trevose,  PA    19047 

Kass  Electronics 
2502  Township  Rd. 
Drexel,PA    19026 

SOUTH  CAROLINA 

Accutek 

420  Laurens  Rd. 

Greenvtile,  SC  29607 

Electronic  Systems  Inc. 
1518  Gregg  Street 
Columbia,  SC   29201 

TEXAS 

Betlaire  Electronic  Supply 
5204  BeHaire  Blvd. 
Bellaire.TX    77401 


Electronic  Center 
2929  N    Haskeri 
Datlas,  TX    75204 


Inc. 


Trimbfe  Electronics 
1918  Mary  Ellen 
Pampa,TX    79065 

UTAH 

Utah  FM  Sales 

1365  E   5360  So 

SaH  Lake  City,  UT  84117 

VIRGINIA 

Northern  Virginia  Communications 
729  N„  Edison 
Arlington,  VA   22203 

WASHINGTON 

ABC  Commumcations 
17541  -  15th  NE 
Seattle.  W A   98155 

A0C  Communications 
2002  Madison  Avenue 
Everett,  WA   98200 

GDS  Electronics 
Box  691  -  Route  1 1 
Spokane.  WA  99208 

HCJ  Electronics,  Inc. 
Spokane,  SNA 

Progress  Electronics 
852  Commerce  Street 
Longview,  WA  98632 

WISCONSIN 

Amateur  Electronic  Supply 
4828  Fond  Du  Lac  Ave 
Milwaukee,  Wl    53216 


IF  YOUR  DEALER  DOESNT  STOCK  /COM  EQUIPMENT, 
LET  THE  ICOM  DISTRIBUTOR  FOR  YOUR  REGION  KNOW, 


DECEMBER  1973 


183 


— 


mm\ 


■ 


HCCt  If  ft    CMHKU 
mu«E   WJ      SQUELCH 


I   Itl  iF^l  Hfl 


Down  to  $429.95.  .  The  FM-27B  Transceiver 
During  Clegg's  1 -Month  Factory  Authorized  Holiday  Sale! 


CHECK  THESE  SPECIFICATIONS 

GENERAL 
POWER  REQUIREMENTS:  12  to  14  VDC 

Current  Consumption  at  13,5  VDC: 

Receive:  4  amps  squelched,  1.2  amps  unsquelched. 

Transmit:  6  amps  max. 
DIMENSIONS:  7  3/8"  x  3  1/2"  x  9  1/4"  deep;  4  lbs. 

net  weight. 

RECEIVER 
TUNING   RANGE:    146 -GO  to    148.00  MHzt  cont*nu> 

ousiy    tuneable   with    reset   capability    of  appro x, 

1    KHz  to  any  frequency  in  range. 
SENSITIVITY:  .35 pv  max.  for  20  db  quieting;  A  /iv 

for  reliable  squelch  action. 
SELECTIVITY:  1 1   KHz  at  3  db;  Less  than  30  KHz  at 

70  db.  Adjacent  (30  KHz  spaced)  channel  rejection 

more  than  70  db. 
AUDIO  OUTPUT:   2.0  watts  (min.)  at  less  than  T0% 

THD  into  internal  or  external  ohm  speaker. 

TR  A  NSM I TT  E  R 
TUNING      RANGE     AND     CONTROLS:     Same     as 

RECEIVER. 
POWER  OUTPUT:  25  watts  Min.  into  50  ohm  load 

P/A  transistor  protected  for  infinite  VSWR, 
MODULATION:   Internally  adjustable  up  to   10  KHz 

deviation  and  up  to  12  db  peak  clipping, 


jm® 


c-vs  ■■-:■-■  .<: 


During  December  only,  you  can  save 
S50.00  on  the  purchase  of  THE  2  meter 
rig,  the  Clegg  FM-27B.  The  only  2-meter 
transceiver  with  any  combination  of  trans- 
mit or  receive  frequency  from  146  to  148 
MHz,  the  FM-27B  needs  NO  ADDITIONAL 
CRYSTALS,  It  gives  you  built-in  total 
coverage,  reliability,  and  dependable  per* 
formance.  Take  advantage  of  this  one- 
month  factory  authorized  special  and  start 
1974  with  Clegg's  2-meter  leader.  Act  today. 
Call  us  now  so  we  can  wish  you  a  happy 
holiday  or  give  you  more  information. 


MERRY 

CHRISTMAS 

HAMTRONICS 

4033  BROWNSVILLE  RD., 

TREVOSE,  PA.  19047 

(215)  357-1400  •(215)757-5300 


TtUut  U*  d* 


Lectfuneb: 


RUM  II 


Announcing  the  new 

2  meter  FM  radio  (144-148  MHz)  by 


Famous  Motorola  FM  2-way  radio  technology  and  leadership 
now  brings  the  highest  quality  in  the  industry  to  the 
amateur  radio  user.  Available  in  25W  or  10W  models,  both 
switchableto  1W.  Integrated  circuitry  virtually  eliminates 
RF  interference.  12  channel  capability. 

10  Watt  -  $399,95  25  Watt  -  S499.95 


25  or  10  watts  of  power,  both 

switchable  to  1  watt 

12  channel  capability  t 

Shipped  to  receive  and  transmit 

on  146.94  MHz 

Only  one  crystal  per  channel  is 

required.  Each  crystal  provides  both 

the  transmit  and  receive  frequency 

tor  simplex  operation. 

Transistorized  pre-amplifier  in 

palm-type  microphone  in  shockproof 

housing 

Solid  state  design  eliminates  open 

or  mechanical  relays — assures 

dependable,  trouble-free  operational 

reliability 

Push  button  repeater  switch  allows 

simplex  or  repeater  operation 

Indirect,  non-glare  illuminated  panel 

controls  can  be  seen  under  any 

adverse  lighting  condition 

Reversible  METRUM  II  control  panel 


TUxm  kto 


Motorola  P33BAM  150  MHz  5  Watt  Portable  less  Btry.  &  Ant $59 

Motorola  T43GGv  150  MHz  30W  Vibrator  Mobile  w/Acc. .$69 

Motorola  T41GGV  40-50  MHz  30W  Vibrator  Mobile  w/Acc $54 

DuMont  Base  1 17Vac  150  MHz  60W  Less  Control  Panel $99 

Motorola  U44BBT-1000  18W  450  MHz  T-Power  w/Acc $89 


G.E.  Strips  450  MHz  Progress  Line 


Xmtr-$15 
Rcvr  -  $20 


M 


aim  COMMUNICATIONS  &  ELECTRONICS,  INC. 


master  charge 

TME  IKTtHMHK  CAHO 


28710  Can  wood  St. 
Agoura,  CA  91301 
(213)  889-6666 


2837  North  24th  St. 
Phoenix,  AZ  85008 
(602)  955-4570 


BankAmericard 


Utftfttfttp  mw 


DECEMBER  1973 


185 


VID 


TAP 


RECORDER 


i  i 


BELL  &  HOWELL  MODEL  2965 

This  is  a  portable  system  and  comes  with 
recorder,  camera  and  charger.  A  TV  monitor 
is  built  into  the  recorder.  Camera  includes 
built-in  Microphone  and  Zoom  lens. 
Recording  time  is  20  minutes  on  5"  tape. 
Recording     is    both    video    and    audio. 


SPECIFICATIONS 


RECORDER- 


Bull:  -n  2  T  E  I A  Byiw  Genomtor 

AGC  Audto'&Vfcto 

RESOLUTION   BSSUnw,  HOR  RESOLUTION   300  \\n 

AU  D I O  R  £5PO  N  S  E    90  1 0,000  H 

POWER  REQUIREMENTS    l?V  DC,  jDwttts 

BATTERIES-  2/36  UU  Rechargeable  loot  included) 

CHARGER    Moit-I  105905 

CAMERA: 

RESOLUTION    b?&  lines   HOR.  RESOLUTION:  BOO  nn« 

VERT   FREG  60HMEIAI 

HOR   FREQ:  ?  5, 750  Hr  I  El  A I 

VIDEO  OUTPUT    1  0  pp.  75  ohm,  unbolinced 

M1N   ILLUMINATION:  30  i 

VIEWFINDEfl  rCRT^m^uhcil 

LENS  S  1  loom  F2      22 

SHIPPING  WT  3Slln 

LIST:  $1595 
OUR  PRICE  (NEW)  $550.00 


BELL  &  HOWELL  Mode)  2966  -  SHIBADEN  SV700UC 

(Assemble,  Edit  and  Stop  Motion) 

This  video  recorder  will  record  directly  from  a  standard 
TV  set  or  a  TV  camera.  It  will  play  back  over  your 
home  TV  set.   Audio  may  be  dubbed  onto  the 
tape.  A  7"  reel  (24001  will  record  1  hr.  No 
home  VTR  unit  under  $1000  can  match 
the  quality  and  capabilities  of  this  unit. 

SPECIFICATIONS 

RESOLUTION:  525  I  me*.  Standard  TV  Of  CCTV  tecotcfeng 
VIDEO:  Input  end  output    1  0  V  p^j,  75  ohms,  unhalanoiri 

Greatff  irian  3,5  MH/  freq,  response.  300  \uw.\ 

plus  Hpf.  resolution. 
AUDIO:  Mikg  or  line  ifiputi.  60-10,000  Hj  Neq,  r*n& 
POWER  REQUIREMENTS    UOV  AC,  95  warn 
DIMENSIONS    1£3/S"  W*  10  3,16'    H  *  151 1/16"  D 
AGC  o<  Manual  Audio  &  V*dfto  gain 
POWER  REQUIREMENTS    1lOVAC,95wam 
WEIGHT   65  lbs. 


MAINTAINANCE 
MANUAL  S5.00 


LIST  PRICE  (1972)  $995,00 

OUR  PRICE  (NEW)  $450.00 

(USED)  $250,00 
Experimenter's  Special  $100.00 


186 


73  MAGAZINE 


ORDER  BLANK 


Please  rush 


Bell  &  Howell  model/s  2966 


Bell  &  Howell  model/s  2965 


Rolls,  Video  Tape. 


Batteries 


.Color  Adapters 


Price 


to :   Name 


Address 
City 


Shipping 


Total 


State 


ZIP 


RECHARGEABLE  BATTERIES  -  New,  for  Porta  Pak  .      $36.00  a  set. 

COLOR  ADAPTERS  —  limited  number  available,  will  work  with  almost 

any   Black  and   White   VTR    to  convert  to  NTSC 
color,  record-playback-does  not  impair  monochrome 

use-  $450.00  ea.  prepaid. 

NEW  NAME  BRAND  VIDEO  TAPES  -  2400  ft.  (1  hr.)  any  quantity 

available,  shipping  wt.  2  lbs.  $29.00 each. 

1200  ft.  (%  hr.)  $19.00  each. 

CONDITIONS  OF  SALE: 

NEW  EQUIPMENT  —   sold    new.    Guaranteed   90   days.   Replaced  or 

repaired  by  us,  if  found  defective  upon  arrival. 

USED  EQUIPMENT  —  sold  as  is  in  good  working  order.  NO  warranty. 

All  units  checked  prior  to  shipment. 

EXPERIMENTER'S  DELIGHT -used  as  is  repairable.  Physically  intact 

not  beat  to  hell,  but  requiring  some  work. 
Problems  and  probable  causes  listed  with  each 
machine. 

PARTS  —  available  at  near  giveaway  prices,  through  us. 

SERVICE  —  units  can  be  sen/iced  by  any  competent  video  technician, 

as  well  as  through  Bell  &  Howell  AV  Service  and 
Shibaden  in  Melrose  Park,  Illinois. 

QUANTITY  DISCOUNT  -  on  orders  of  more  than  10  machines. 

DEALER  INQUIRIES  —  are  invited  for  sale  of  new  equipment. 

New  machines  have  standard  Japan  EIA  8P  connector  to  mate  with  all  popular  VTR  monitors. 
Used  machines  have  all  coax  and  cannon  xl  connectors.  Used  machines  do  not  have  AGC  or  edit 
ability,  but  are  otherwise  identical  and  interchangeable. 

All  sales  are  final.  Cash  with  order.  Shipped  best  way.  Freight  charges  collect. 

COMMUNICATIONS  UNLIMITED 


STORE 
l\IOON-6pm 


HOURS 
TUES.-  SAT. 


9519  MAIN  STREET  P.O.  BOX  463 
WHITMORE  LAKE,  MICHIGAN  48189 

{313)449-4367 


&° 


w 


et* 


^fie 


»<e    *°\    <*& 


,»* 


AT*** 


<* 


d»° 


DECEMBER  1973 


187 


SEND  FOR  NEW 
J97&A  CATALOG 


GREGORY  ELECTRONICS  CORP 

The  FM  Used  Equipment  People. 

249  Route  46,  Saddle  Brook,  NJ.07662 
Phone  (201)  489-9000 


6  Meters —Excellent  Condition! 

Motorola 
Special  Model 

X71GJT-1190B, 

12  volt  transistor  powered 
mobile  in  15"  case,  100  watts. 
2  Freq.  transmit  and  3  freq. 
receive  capability. 
2  Freq.  Tx.  and  2  freq.  Rx.  on 
40-50  MHz.  range;  a  separate 
Rx.  front  end  allows  a  3rd  Rx. 
freq.  on  30-40  MHz. 


With 
accessories . . . 


$228 


The  General  Electric 


Message  Mate 


personal 


•i« 


cket 


voice  receiver 
with  sel-call 


150-162  MHz,  162-174  MHz 

Specify  Frequency  Range  When  Ordering. 


Fully  transistorized,  100%  solid-state  for 
the  ultimate  fn  reliability  and  perform- 
ance. 

Selective  signaling  options  provide  for  in- 
dividual messages  both  inside  and  out- 
side of  buildings, 

Operates  in  full  compliance  with  Part  15 
of  the  FCC  rules. 


$78 


less  reeds 


(Charger   included   with   nickel-cadmium 
model) 

With  new  $f>A 

mercury  battery  . , ,     WO 

Ask  about  low  band  models. 


188 


73  MAGAZINE 


<2 


ROHN  manufacturers 
towers  that  are  designed  and 
engineered  to  do  specific  jobs 
and  that  is  why  we  have  the  FOLD- 
OVER  TOWER  .  .  .  designed  for  the  amateur. 


When  you  need  to  "get  at"  your  antenna  just  turn/1 


•%        / 


the  handle  and  there  it  is.  Like  other  ROHN  big 
communication  towers,  they're  hot  dip  galvanized 
after  fabrication  to  provide  a  maintenance  free, 
long  lived  and  attractive  installation.  ROHN  towers 
are  known  and  used  throughout  the  world  ...  for 
almost  a  quarter  century ...  in  most  every  type  of 
operation-  You'll  be  in  good  company.  Why  not 
check  with  your  distributor  today? 


■**©* 


ROHN 


MANUFACTURING 


® 


DIVISION   OF 


P,0.  Box  2000/  Peoria,  III.  61601 


DECEMBER  1973 


189 


1344  E.  Indian  School  Rd.-Phoenix,  AZ  8 

(602)  277-2712 

This  Month's  Specials 


S&R 


makes  economy  exciting! 


Motorola  RF  Transistors  Unmarked 


Type 

2N3866 

2N5589 

2N5590 

2N5591 

2N6O80 

2N6081 

2N6082 

2N6083 

2N6084 

2N6166 

MRF304 


Qty, 

1352 

364 

112 

44 
222 
280 
173 
173 
260 
50 
17 


Price 
3/L50 
3/6.00 
3/9,50 
3/20-00 
3/6,00 
3/9.  50 
3/16.00 
3/24.  00 
3/30. 00 
3/50. 00 
3/30,  00 


Motorola  RF  Transistors  Marked 


2N1692 

2N1693 

2N2857 

2N2887 

2N2947 

2N3925 

2N3950 

2N4072 

2N4073 

2N5109 

2N5177 

2N5179 

2N5583 

2N5590 

2N5591 

2N5643 

2N5849 

2N5862 

2N5942 

2  N  6081 

2N6082 

2N6083 

2N6084 

2N6097 

2N6135 

2N6166 

2N6266 

MM  1500 

2N5842 

MM  16  20 

MM1661 

2N5645 

MM8006 

MRF207 

MRF209 


3 
3 
1 
2 

9 

394 

13 

1963 

2 

1361 

1 

1744 

i 

30 

4 

14 

4 

11 

14 

20 

24 

25 

384 

21 

1 

40 

2 

2 

950 

2 

1 

1 

1000 

1 

4 


2,00 

3.00 

LOO 

3.00 

8.00 

2.00 

10.00 

.75 

1.00 

1.25 

6.00 
.35 

3.00 

5.00 

9,00 
10.00 
15.00 
20.00 
20.00 

6.50 
10. 00 
15.00 
2/30. 00 
15,00 

5,00 
30.00 
40.00 

2,00 

2,00 
10.00 

5,00 

5,00 

1.00 

3,00 

8.00 


/ 


3CH6! 


H  BESP 
ANYWHERE! 


c«*  an  at 
a  no   dia 


UU  91 
0  1*0     Dl* 


Motorola  HEP  Semiconductors 


RF  Transistors 
HEP  75 
HEP    76 

S3001 

S3002 

S3003 

S3005 

S3006 

S3007 

S3008 

S3010 


^ 


& 


& 


C*.  III  I  02 
0  W»     CUt 


00 


Hot  Carrier  Diodes 
HEPR0700 

HEPR2500 
R2501 
R2502 
R2503 

R2504 
R2505 


s 

Bfl 


H 


FETs 

HEP801 
803 
F0021 

F1035 
F2004 
F2005 
F2007 


<>> 


& 


0 


Price 

Each 

Our  Price 

$ 

2.95 

2.00 

4.95 

4.00 

3.75 

3.00 

8.20 

6.50 

1 

20.00 

15.00 

» 

9.55 

7.00 

19.90 

15.00 

24.95 

19.00 

2.18 

L.60 

4.90 

3.00 

1.09 

LOO 

1.10 

.88 

1.10 

.88^s 

1.10 

.88^ 

1.10 

.88 

1.10 

.88 

1.10 

.88 

L59 

1.20 

3.39 

3.00 

1.89 

1.50 

1.29 

LOO 

2.50 

2.00 

2.90 

2.00^ 

2.90 

2.00 

**» 


^s> 


Sf 


(Also  HEP  Cross  Reference  Available  with  Any  HEP  Ordered) 


190 


73  MAGAZINE 


Bargains 


Microwave  Ass.   A  Components, 

Type  and  Manufacture 

FXR   3155A 

H,P.  S370B 

H.  P.  3  60 A 

Airborne  Inst.  Inc.  7010 

Narda  7305 

Narda  730 

Wave  line  611 

PRD  154 

M+C,S„  P-265-1 

PRD  559A 

Narda  211 

Waveline  658 

H.P.  HX292B 

Narda  614 

Narda  615 

Omni  Spectra  201845/J 

Demo  may  Bonardi  L-450 

Narda  350  H 

Waveline  641 

Waveline  642 

Demo  may  Bonardi  HJ-018 

Guide  Ind.  Inc.  151 5-.  5 

Aircom  W6C0O 

Unilinern  125 

Airborne  Inst.   lab.  70B-49 

Frequency  Eng*  WG-1217-5B 

Frequency  Eng,  5882-4N 

Frequency  Eng.  8397-1 

H*P.  X421A 

H.P.  G487A 

H*  P.  X281A 

H.P.   420B 

H.P,  775D 

PRD  X1410 

FXR  X601A 

PRD  19  5  A 

PRD  19  5B 

Rantec  MX- 200 

Waveline  554 
Narda  301 

FXR  X1551 

PRD  18  8  A 

FXR  X410B 

Narda  10U 

H.P.   H750D 

Varian  VA1281B 

Go  mhos  G-450 

Demomay  Bonardi  H480 

Demo  may  Bonardi  J  480 

Demornay  Bonardi  J102 

Demomay  Bonardi  XL- 10 2 

PRD  585  B 

PRD  I30A 

Demornay  Bonardi  L-234 

Demornay  Bonardi  DBL-650 

Demomay  Bonardi  L-610 

Demomay  Bonardi  DBL-440A 

Waveline  260 

Demomay  Bonardi  L-010 

L*  H,  Terpening  Co.   3232-550 

Guide  Ind.  Inc.   1516- .  5 

H.P,  430C 

H.P.  430B 

Narda  438 


Equipment  Sale 
Qty        Price 


1 
1 
1 
1 


2 
8 
2 
2 
1 
1 
1 
2 

1 
1 
1 
1 

1 
1 
1 
1 
1 
2 
I 
I 

1 
2 
2 
2 
4 
1 
1 
2 

1 
1 
1 
1 
6 
13 

1 
2 

1 
1 
1 
1 

1 
1 
1 
1 
1 
1 
2 
2 
1 
1 


10. 00 

10. 00 

10.  00 

15.00 

5,00 

5,00 

5.00 

5*00 

7,00 
15.00 
25.00 

5.00 

4.00 

6.00 

10,  00 

5.00 

7,00 

3,00 

3.  00 

4,00 

6,00 

4.00 

7*00 

5.00 

15,00 

20.00 

20.00 

10,00 

10.00 

15.00 

5.00 

10,00 

50.00 

5,00 

6.00 

6.00 

10.00 

4.00 

100 

10,00 

6.00 

10.00 

10. 00 

10. 00 

10, 00 

7.00 

5,00 

5, 00 

5.00 

5.00 

5.00 

10.00 

7,00 

10.00 

10.00 

10.00 

10. 00 

15.00 

10.00 

10.00 

10, 00 

20.00 

IS.  00 

20.00 


^ 


^ 


write 

S&R 
first 

you1!  I  save 
time,  postage 

and  MONEY 


Microwave  Semiconductors  Corp, 

Price 
MSC2001  35*00 

MSC3001  60,00 

MSC4001  87*00 

MSC4003  125.00 


Communications  Corp. 

Dl-28 

D10-28 

El-28 


3.75 
19.00 

30.00 


Dickson  F^st  Recovery  Diodes 
1N3891  2.00 

1N3890  2*  00 

1N3880  2. 00 


YOU  NAME  IT 


Tubes  WE'VE  GOT  IT! 


NEW 

6146A 

8683 

8106 

8102 

7984 

6907 

6360 

8298 

6146  B/ 8  298 

5894A 

2E26 


Price  Each 

$  4.00 

15. 00 

2.00 

L30 

3.95 

15.00 

5,00 

3.50 

4.50 

17.00 

2,00 


Used  and  All  Tested  by  JFF  and  Warranted  by  S  and  R  Enterprises 

6146  2. 50 

5894  8*  00 

2E26  L  25 

6939  3.00 

6883  2fl00 

6360  2m  50 

8032  2. 00 

8106  LOO 

8458  5.00 

6907  7. 50 

7377  7,50 

8683  70  50 

5762/7C24  100,00 


® 


DECEMBER  1973 


191 


ANOTHER  SELECTRONIC  SPECIAL 
The  R648/ARR  41  Receiver 

Can  be  best  described  as  a  mint  version  of  the 
R390A  rec,  and  has  most  of  the  key  features  of 
the  390A. 


t mm 

-^                   J' 

q: 

j      ^^ 

^^L^^^^^^^i 

m                                    —           — 

\1 

VT  " 

I      i 

1                 ' 

Digital  readout  500  kHz  to  24.999  Mhz 

1,4  kHz  to  6  kHz  mechanical  filters 

500  kHz  to  if,  Double  conversion 

Xtal  calibrator,  500  ohm  output 

17  tubes 

8"  x  I?1*  x  12"  -  Weight:  34  pounds 

Receiver  has  been  tested,  overhauled,  and  guar- 
anteed. Excellent  condition   Price:  $175.00 

We  have  a  few   receivers  with    AC   power  supply 
instaMed-  Price:  $199,50 


Solid  State  866 A  Direct  Replacement 

Price:   $5.95  ea.  or  2/$10.00 

R508  VHF  Rec,  118-148  MHz 

Price:  $14.95  ea- 


TUNES 
ALUM. 
EIMAC 
CAP,    - 
MERS  - 
DUCTO 
FIER   - 
CX250  - 
WITH    * 


FLF,  AMPLIFIERS 

50    to    100    mhz   -   COMPACT   ALL 

CASE  12"  x  15"  x  6V/'  WITH  SK  600 

SOCKET.    1    LARGE  AIR  VARIABLE 

2    SMALL    AIR    VARIABLE    TRIM^ 

-  TEFLON  MOUNTED  ROTARY   IN- 
R    -    GOOD    FOR    LINEAR    AMPLI 

CAN  USE   EITHER  4  CXI  BOA  or  4 

-  LESS  TUBE,  PRICE:     .  .  .   $14,95  ea. 
4X150A,  PRICE:    . ...    $19.95  ea. 


ADJUSTABLE  PRINTED  CARD  BOX 

F  Or  Rack   Mount 
5"    lo    7%"  -    16    slides   and   sockets       includes 
30  double  contact  position  edge  connector  type 

Price:   $9.95  ea 


Receiver  type  VHF-2RM  108-135  MHz  crystal  control 
Double  Conversion  AM  with  AVC  noise  limiter  and 
squelch-tunable-  1 15  voltsr  50-60  cycles,       Price:  $24.95. 


WINTRONIX    MODEL    850    INDUCED    WAVE    FORM 

ANALYZER.  This  unit,  in  conjunction  with  your  present 
oscilloscope,  perm  its  you  to  view  wave  forms  in  the  range 
from  audio  thru  MHz  without  any  direct  connection.  The 
probe  is  simply  placed  over  the  tube  in  question  and  the 
wave  form  is  displayed  on  the  oscilloscope.  It  may  also  be 
used  as  a  high  gain  amplifier  to  increase  scope  sensitivity. 
Excellent  for  TV,  radio,  amplifier,  and  transmitter  repair 
and  maintenance.  Brand  new,  with  probe. 
SHIPWT.  13  lbs.  Price:    $19.95  ea. 


MODULE  TYPE  POWER  SUPPLY 
TRANSISTOR,  REGULATED. 
115V  -  60   cycle    in    +12    -12    -6V  @  3  amp 
output.    Front    Panel    adj    +    or    -10%.    On  off 
switch,    Fuses.    Barrier  strip   output.   6*     x  5'     x 
7\  Excellent  Cond. 

Ship.wt.  10=  Price:   $14.95  ea. 


^^  — ■ 


Small   B5031,  No  boards  with   sockets,  4/$5.00. 


DIGITAL  READOUT  SET 

Make     your    own    counter,      frequency    meter, 
digital  voltmeter,  readouts,  etc. 
Kit  includes 

6  nixies  with  6  sockets 

1  transformer 

1   P/S  board  w/socket 

PRICE: • ,  .$12.95,  2/S20.0O 


MODERN  ALUMINUM  BENCH  RACK  CABINET 

11V    H    x    18"   O   x    19"  W.  8"  panel  openings 
w/rubber  feet  and  disappearing  handle. 

Lt  Blue  Price:    $7.95  ea. 


COMPUTER  TYPE  CAPACITORS 

40,000  @  20V 

32,500  @  25V 

56,000  @  1  5V 

1 00,000  @    8V 

50d  each  or  5  for  $2,00 

40,000  @  10V 
30,000  @  10V 

PRICE:  3  for  $1.00 

Receiver  R  36/GR  225-400  MHz+  Crystal  Control  Double 
conversion  FM  with  squelch  and  noise  limiter.  600  ohms 
output.  1 15-230  Volts,  50*0  cps.  Price:  $24.95 


Coaxial    relays,    single   pole 
UHF.BNC,  Type  N.  Specify. 


double    throw,   available  in 
Price:S4.95  each. 


Quality   precision   polished   plate  glass  2.200"  by 
9.540"  by  ,250". 

Price:  4  pc/Sl.QO,  25  pc/$5,00 


Adapters  BNC  to  SO-239. 


Price:  2/$  1.00. 


Lighted  switches   2  pdt  push  pole  panel  mount 
5/8"  hold; 

$1.00  each,  6/S5.00 

Triad  transformers    F-21A   115  Volts  60  cycles 
6.3  VCTat  10  Amps. 

Price:  $4.95, 


Transmitter,  110  W  FM,  406-420  Mc    Rack  mount,  with 
power  supply. 

Price:  $150.00 


■  ■  '■■ 


ALL  PRICES  ARE   FOB.  OUR  WAREHOUSE,  PHILADELPHIA,  PA.  ALL  MERCHANDISE  DE- 
SCRIBED ACCURATELY  TO  THE  BEST  OF  OUR  KNOWLEDGE.  YOUR  PURCHASE  MONEY  RE- 
FUNDED IF  NOT  SATISFIED.  TERMS  ARE  CASH.  MIN.  ORDER  $5.00.  ALL  MERCHANDISE 
SUBJECT  TO  PRIOR  SALE.  RFE  -  REMOVED  FROM  EQUIPMENT. 


$E£.£CT#0A//C$ 


1206  South  Napa  Street 

Philadelphia,  PA  19146 
215-468-7891       215-468-4645 


192 


73  MAGAZINE 


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NUMBER 

(Continental  48  States) 

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Bi 


W0KF 


(9  A.M.— 5  P.M.  Central,  daily  except  Sunday) 

FOR 
A  SQUARE  DEAL 


ON 

DRAKE 

TEMPO/ONE 

HALLICRAFTERS 

CLEGG 

STANDARD 


YAESU 

SWAN 

COLLINS 
KENWOOD 

REGENCY 


We  carry  all  major  brands  and  a  large 
stock  of  used  reconditioned  equipment 

Write  for  used  list 


RADIO 


I     8342  OLIVE  BL. 


ST.  LOUIS,  MO  63132 


— ■ 


##/# 


IS  THE  NAME  OF  THE  GAME  !  I 


AMPLIFIERS 


Frequency 
1MHz) 


144 


Mod»l 


PA2  12B 
PA  10-408 

PA10  70B 
PA2  70B 
PA1CM4GB 
PA2-1408 

PA30-140B 


Input  Range 


1 
5 

5 
1 

1 


4 

15 

15 

4 

lb 

4 


1540 


Nominal  Pq 


PRICES 


12 

40 

70 

70 

140 

140 

140 


$44.95 
79.95 
129.95 
149,95 
179.95 
19995 

169  95 


ADD  UP  TO  33  dB  GAIN  TO  YOUR  SYSTEM* 

from 
OUR  IMPRESSIVE  LIST  OF  "GAIN  BLOCKS " 


FHECL 

13-9-14,4 

13-30 

40-130 

50-52 

50-52 

144-148 


144  148 
220^225 

220-225 
420-450 
420450 


ANTENNAS 

MODEL  GAIN  OVER  DIPOLE 

KLM  T 3-9- 14.4-5  Write  tor  details 

KLM13  30  7typ, 

KLM  40  130  7tvp. 

KLM  50-52-8  12 

KLM  50  52-11  14 

KLM  144-148-7  9t 

KLM  144-148-8  10-3 

-9  11.5 

-11  12.2 

12  13.5 

14  14.2 

KLM  144-14&16  14.8 

KLM  220  225-9  11.5 

-11  12.2 

KLM220  22S14  14.1 

KLM  420-450-14  11. 5t 

KLM  420  450-27  14.5 


PRICES 

$289.95 
12595 
55.95 
89.95 
21.95 
2695 
31.95 
35.95 
38.95 
45,95 
49.95 
20,95 
25,95 
34,95 
19.95 
41,95 


t  Rearmouniable 

*  PA2-  HOB  and  KLM  144-148*16 


We  also  make  a  full  line  of  single  and  multichannel 
television  antennas  to  beat  the  "Blackouts".  Commercial 
FM  hand  antennas  also  available. 


Contact  your  local  distributor  or: 


Write  for  our  complete  catalog. 


California  residents  add  5%  sales  tax,  add  $2  for  PPD 
Prices  subject  to  change  without  notice 


ELECTRONICS 


§§ 


THE  COMMUNICATIONS  EQUIPMENT  INNOVATORS" 

1600  Decker  •  San  Martin,  California  95046 

(408)  683-4240  or  (408)  842-7349 


DECEMBER  1973 


194 


*\ L    Loo L  ■   •   ■   •   ■   ■ 

Repeater  Sophistication 


Is  HERE 


Now  at  a  realistic  price  you  can  have 
"Touch-Tone"  command  functions, 
autopatch,  and  control.  It's  the  Signal 
Systems  Decoder. 


12/16  BUTTON 
TOUCH-TONE  DECODER 

Uses  NE-567  decoder  IC's  and  7402 
AND  gates.  Frequencies  are  pot  vari- 
able. Response  times  are  fixed  by 
capacitors.  (200  ms.  unless  otherwise 
specified). 
Outputs  are  ANDed  TTL  logic  highs. 

Hequires:   5V 

Board:  $10.00 

Kit:  12  button-    77.00 

Kit:  16  button-    88.00 

Tested:  1 2  button  -    85.00 

16  button-    98.00 


RTTYR-Y  GENERATOR 

Uses  two  NE-555  timers,  7420  and 
7493  IC's.  Outputs  repetitive  or 
clutched  zero-bias  test  signals  in 
Western  Union  format.  Used  to  check 
printer  range  and  aid  proper  adjust 
ment.   Requires  5  volts.    Loop  driver 

circuitry. 

Board:  $  1.75 

Kit:  8.00 

Tested:  11.00 


THE  IDENTIFIER 

TO  END  ALL  IDENTIFIERS 


ftu, 


CW/RTTY/REPEATER  IDENTIFIER 

Uses  8223  Programmable  read-only- 
memory.  NE-555  timers  for  clock, 
tone  generator  and  5  minute  timer. 
Apply  5  volts  (200mA)  and  COR 
(ground)  and  it  outputs  tone  (5  VPP) 
and  PTT  <5V). 

256  bit  plug-in   memory   is  program- 
med to  your  specifications  or  call. 
Dits  and  element  spaces  =  1  bit. 
Letter  space  =  2  bits. 
Dash  =  3  bits. 
Word  space  =  4  bits. 
Typical  full  memory:  CQ  FD  CQ  FD 
FD  DE  WA0VTU/0  K 
Can  also  be  programmed  to  output  up 
to     32     RTTY     characters,     5     level 
Baudot,  double  stop.  See  ARRL  Man- 
ual   "FM    and    Repeaters"  page   136. 
For  5  minute  timer  and  tone  oscillator 
add  S5.00  to  Kit  price  and  S6.00  to 

Tested  Unit  price. 

Additional  factory 

programmed  memories:  S14.00 

Board:  8.00 

Kit:  25.00 

Tested:  29.00 

2  METER  PREAMP 

40673  or  MFE3007  Dual  Gate  FET. 
Very  small  size— 1  1/8X1  5/8  inches. 
16  db.  gain,  2.5  db.  noise  figure. 
Board:  $  1.10 

Kit:  9.00 

Tested:  13.00 

Look  for  product  review  write-ups  on 
these  and  other  exciting  new  products 
from . . . 


Phone  303-392-9073 


SIGNAL  SYSTEMS 

2650  Durango  Dr. 
Colorado  Springs, 
CO    80910 


DECEMBER  1973 


195 


M 


15   or 


144- 146  MHz 


Watts 


1-2  WATTS  IN 

PA-1501H  -  15-20  WATTS  OUT 

PA-2501H  -  25-30  WATTS  OUT 


ONLY  2"  x  VA"  x  6 


tf 


12-14  VOLTS 
NEGATIVE  GROUND 

LESS  THAN  1  DB 
LOSS  ON  RECEIVE 

SOLID  STATE 
SWITCHING 


PA1501H 
PA2501H 


Also  available: 


$49.95 
$69.95 


WIRED 
& 

TESTED 


$39.95 
$59.95 


COMPLETE 
KIT 


RX-50C  30-60  MHz  receiver  kit  w/crystal  filter 

RX-144/220A  2/220  receiver  kit 

RX-144/220F  2/220  receiver  kit  w/ceramic  filter 

RX-144/220C  2/220  receiver  kit  w/crystal  filter 

TX-144  1  watt  exciter 

TX-220  1  watt  exciter 

PA-144/220  1 5  watt  amp  less  cabinet,  connectors,  and  switching 
PA- 144/220  25  watt  amp  less  cabinet,  connectors,  and  switching 

PA-8005H  90  watt  amp  5  watts  in  wired/tested   

PA-8020H  90  watt  amp  25  watts  in  wired/tested   

PA-432  10  watt  amp  less  cabinet,  connectors,  and  switching    . . . 

PS-12  12  amp  regulated  12-15  volt  power  supply  kit    

PS-12W  Wired/tested 

PS-24  24  amp  same  as  PS-1 2  less  case 

COR-1  COR  with  3  second  and  3  minute  timers 


«    *    < 


$59.95 

.  65.95 
.  69.95 
.  29.95 
.  29.95 
.  29.95 
.  49.95 

129.95 
.  39.95 

CO   QC 

•     WW  *  WW 

.  69.95 

v   0*7>wO 

.  19.95 


\^  Write  for  data  sheets  on  any  above  units.  Add  postage.  NY  state  residents  add  sales  tax.     J 


ENGINEERING 


-  DIV.  of  BROWNIAN  ELECT.  CORP.  - 

320  WATER  ST.     POB  1921      BINGHAMTON,  NY   13902     607-723-9574 


I  yb 


73  MAGAZINE 


N 


W 


110 


WATT 


POW 


R 


R 


A  PERFECT  COMPANION  TO  YOUR  CLEGG  . 


■    ■ 


PA- 110/30 
$149.95 

wired  and  tested 


Measures  7  x  9  x  3% 


POWER  OUT 


120    - 


110 


RF  POWER  TRANSISTORS 

2N3553 

2.5W 

400  MHZ 

92.10 

2N3366 

1W 

400  MHZ 

1.40 

2N5589 

3W 

175  MHZ 

5.75 

2N5590 

10W 

175  MHZ 

9.50 

2N6080 

3W 

175  MHZ 

5.95 

2N6081 

15W 

175  MHZ 

12.50 

2N6082 

25W 

175  MHZ 

16.50 

2N6084 

40W 

175  MHZ 

25.00 

CTC-B25- 

-12 

25W 

175  MHZ 

15,95 

CTC-B40- 

■12 

40W 

175  MHZ 

22,50 

CTC-C3-] 

L2 

sw 

470  MHZ 

6.95 

CTC-C12- 

-12 

12W 

470  MHZ 

9.95 

CTC-C25- 

■12 

25W 

470  MHZ 

19.95 

100 


90 


BO 


70    - 


60 


50    - 


10       15      20     25      30     35 


POWER    IN 

BUILDING  STUFF  -  ALL  NEW  FACTORY  FRESH  PARTS 

Underwood  uncased  micas  -  22  -  47  -  68  -  100  -  150  -  200  -  500  mmf  $1.00  each  or  10 
assorted  your  choice $7.50 

Mobile  microphone  -  dynamic  hi  output  PTT  with  4  foot  coiled  4  conductor  cord    .  .  .  $8.95 

(The  same  microphone  used  on  our  Marine  Radio) $5.00 

Mica  Trimmers  -  403  -  $.50,  404  -  $.60,  406  -  $.75,  463  -  $.50 

Ferrite  Beads  ■  $.10  each  or  12  for  $1.00  Ferrite  Choke  VK200.20/4B  -  $.60 

Molded  Chokes  -  .1 5,  .33,  1 0, 100, 82K  uH  - $.70  each 

Miniature  IF  Transformers  455  Khz  -  $.50  each,  10.7  Mhz  •  $.65  each. 

LED  —  Motorola  MLED  655  with  plastic  mounting  assembly  $.60  each  or  10  for  $5.00 


Telephone  COD  orders  accepted.  Be  sure  to  include  enough  postage. 


HF  ENGINEERING 

-  DIV.  of  BROWN1AN  ELECT.  CORP.  - 


320  WATER  ST.     POB  1921      BINGHAMTON,  NY   13902     607-723-9574 


*\ 


DECEMBER  1973 


197 


M 


YOUR  HAM  &  PARTS 
HEADQUARTERS 


NEED 


We  have  7,000  to  choose  from!    All  in  Stock. 


95 

each 


Just  write  or  phone  in  your  order  and  we  will 
get  it  out  to  you  THE  SAME  DA  Y! 


Crystals  in  Stock  for:  Regency  -  all  models, 
Standard  -  all  models,  Drake  -  all  models,  Tempo 
FMH,  SB  144,  IC  20  &  21,  Genave,  Trio,  and 
Ken. 

All  standard  repeater  and  simplex  channels. 


We  also  Stock:  Standard,  Clegg,  SBE,  TPL, 
Regency,  Galaxy,  Hallicrafters,  Genave,  Hy 
Gain,  Cushcraft,  Shakespeare,  A/S,  Rohn, 
Alliance,  Belden  and  many  more!!! 

WRITE  FOR  OUR  FREE  CATALOG 


500,000  electronic  parts  always  in  stock  -  SYLVANIA,  ECG,  WORKMAN, 
G.C.,    CALECTRO,   JFD,    RMS,   PANASONIC,   PIONEER,   MARANTZ, 
SHARP  and   many   many   more   !    ! 


198 


73  MAGAZINE 


Christmas 

Specials : 


Standard  146A 


I  T"UM  ■     ■     ■     ■     m 

Charger 
Rubber  Ant. . 

Case     

3  extra  sets 
of  crystals  . . 


.  289.00 
.  35.00 
,  6.00 
.    10.00 


*60 


Standard  826ma 


.    29.70 


369r7tT  300 00 


SB144 

Hustler  TLM 
SF2  5/8  wave  . 
3  extra  sets 
of  crystals  .  . . 


SB144 


259.00 
21.95     goS® 


SCR826MA.. 
Hustler  TLM 
SF2  5/8  wave. 
8  extra  sets 
of  crystals  .  . . 


398.00 


21.95     S^Ve 
79.20 


499rW  399.15 


Clw 


FM27B 


FM27B.  „, 
Pwr  supply 


479.00 
79.95 


$a^e 

*83 


29.70 


*60 


£L0^5"  250.65 


55*^5"    475.95 


ALL  TPL  Amplifiers 
in  stock  -ALWAYS! 


We  also  Stock  .  .  . 

Hustler,  A/S,  Cu  she  raft,  Hy  Gain, 

Shakespeare,  Rohn,  Ascom,  and 

Beiden. 


each 


1 


491  Riverside,  Medford,  Mass.  02155 

(617-396-5550) 


DECEMBER  1973 


199 


GAM  has  what  your 

repeater  needs 


vi 


8.2  dB  GAIN  OVER  ISOTROPIC 


Vertical  Radiation  Pattern 


TG5-S 


m*!*^^^m!m!V?mf*F 


—  Dipole 
>*  Isotropic 


Horizontal  Radiation  Pattern 

—  TG5-S 

—  —  —  Dipole 
»**-  Isotropic 


(ON  FILE  WITH  FCC) 

MODEL  TG5-S 

LIST  PRICE 


$10450 

Weight  3%  lbs- 


Offset  Side  Mount  Radiation  Pattern 
Reference:  Dipole 


• 


Electronics 


191  VARNEY  STREET 
MANCHESTER  NH  03102 
TEL.  (603)  627-1010 


y 


200 


73  MAGAZINE 


r. 


WORLD'S  LARGEST  SELECTION  OF 

NEW  &   USED  TV   CAMERAS  &   ASSOC.   EQUIPMENT 


^*?ttsXX*3tt*^^ 


Broadcast  &  Closed  Circuit  TV 
Audio  and  Video  Systems 


PRICE 
$1.00 


NDEX    PAGE    142 


CATALOG    # 

973  S  1 


$1*00  ppd  USA— $2.00  Foreign. 
Free  to  requests  on  Company 
Letterhead. 


THE  PENSON    ELECTRONICS   CORP. 

9AM  -  4  PM  Monday  thru  Friday*,  otherwise  by  appointment. 


OFFICE:    Longview  St.      Tel.  Area  Code  203/875-5198 

MAIL:   Post  Office  Box  85 


ROCKVILLE,  CONN.  06066  USA 


DECEMBER  1973 


201 


UT-1 

Portable  Tune  Up  Meter  with  cables  to  plug  into  Motorola, 
Link,  GE,  Standard,  etc.  This  unit  gives  you  the  meter 
functions  of  the  radio  being  tested.  It  also  operates  as  a 
portable  dc  voltmeter  with  the  following  full  scale  ranges: 
1.5,  5,  15,  50,  150,  500,  1  KV  with  a  special  3  volt  range  for 
GE  Progress  Line  equipment.  The  UT-1  can  be  set  zero  center 
for  discriminator  readings.  Also  featured  in  the  UT-1  is  a  field 
strength  meter.  Place  your  order  now.  Kit  form  $42,50,  Wired 
$49.95.  Extra  cables  of  your  choice  {specify  rig)     .  $5.00  ea. 

($2.00  for  postage  and  handling  J 


TESCO-PAD 

The  'TESCO-PAD"  has  no 
tuned  coils  to  go  off  frequency, 
no  tuning  necessary  or  even  there! 
It's  all  in  one  "Black  Box  IX." 
ready  to  go.  The  "TESCO-PAD" 
has  a  1  second  hold-up  for  your 
transmitter,  complete  P.T.T. 
operation,  available  with  dual 
audio  output  levels,  12  or  16  tone 
combinations* 

KIT  $34.95  $39.95  Wired 


(Add  $1.00  for   16  tone  version) 
($2.00  for  dual    output  version) 

\dd  $  1.00  for  postage  and  handling  J 


•  Tabletop  size  -  10Vw  by  8"h 
by  13"  long 

•  60  A  @  slightly  less  than  12  Vdc 

•  Nominal  Output:  50  A  at  12  Vdc 

•  Voltage    and    current      metering 
built  -in 

■ 

•  Will  run  a  mobile  rig  &  even  an 
amplifier   from    110   Vac 


THE  UL  TIM  A  TE  IN 
12  V  PO  WER  SUPPL IES 


$100  KIT 


$125  WIRED 


Shipped  freight  collect  -  47 lbs. 

ORDER  NOW-  PRICE  INCREASE  COMING  IN  EARL  Y  1974 

Mealier  Electronics  -    Test  Equipment  Sales 

P.O.  Box  9913,  Chevy  Chase,  Md.     20015    Telephone:     301-652-0996 


202 


73  MAGAZINE 


Removed  from  new  equip* 
ment"  Includes  popular 
2N174  "doorknob*  transs*- 
i  r»r  TO-;tfi,  jn*rmaniuni. 
PNI\  l.=Vo  watts,  VCBO 
80  V,  15  amps,  in  hfe.  For 
ipniitr>Ti+  hifth  power  Lrans- 
i  liters,  etc.  Mounted  cm 
heat  sink   5  x  2Va   n   1*4 


HIGH  POWER 

TRANSISTOR 

WITH  HEAT  SINK 


fJi  I 


or  S3 


^*-  -J     *-" 


^ 


1"  SQ 
MINI 
METERS 


*  Plastic  cam 

*  Red  needle   Indicators 

O  Balancing,  stereo,  tape,  amps. 
VC,  side  miff,  plus  ,i  minus  20  db. 
I  VU(  front  mtg,  plus  3  minus  20  db. 


$1.49 


>■ 


POLY  PAKS  — THE 
,  INFLATION  FIGHTER 

YULETIDE  SALE! 


SUBTRACT  $1.  FROM 
ANY  $15.  PURCHASE 


LED  MITY  DIGIT  "DCM'S 


ff    *Your  choice  of  5 
red  LED  readouts! 


D 
Only 


Buy  3  — 

|T*h*   lU*fc 

READOUT 

LJ  MAN-1 

_j  MAN-4 

J  707* 

I  704** 

SLA-I* 


Char. 
,27  h. 

,33  h. 

,33  h. 

33  h 


Scientific  Devices  "Digital  Counting  Modules'  outper- 
form any  other  DCM  on  the  market  today.  More  fea- 
tures than  ever  before!  Not  gaseous,  not  incandescent^, 
not  nixie  but  the  modern  LEU,  Choose  from  such  famous 
manufacturers  as  Monsanto 's  MAN-1,  MAN- 4,  Li  Ironies 
7  07  and  7  04,  Opcoa's  SLA-1  {the  last  4  having  charac- 
ter heights  of  Q/A'A  at  no  extra  charge)  .  Each  kit  in- 
Maker  "eludes  3x2"  p,c  board  with  fingers  for  a  FREE  edge 
Monsanto  connector,  side-mounting  dip  socket.  LfciD  readout  of 
your  choice,  re^istum,  3  IC's.  and  Molex  connectora 
(this  ELIMINATES  SOLDERING  YOUR  IC's),  apd 
booklet.  INCLUDES  P-C,  EDGE  CONNECTOR  —  FREE! 


5pi/.99 


Monsanto 

Lltronlcs 
Litronics 


LINEAR 


•    FACTO* Y 
OUARANTEEO 

Buy  3 


Op  Amps 

0  |raCTOWY   TESTIftfl 


ractoar 

MA*KID 


Take  10%   off 


Opcm  *  Pin-for-pin  MAN-1.*'  Fin-for-pin  MAN*4.  elec,  ebar,  same 


MAN 


\0 


LITRONIX-OPCOA-MAN  "7-SEGMENT 

LED  Readouts 

MAN-1 

All  fit  14 -pin  IC  sockets.  All  7 -segments.  MAN  Series 
"all  LED"  and  niiufe  by  Well -known  We  I  oaat  mfffr. 
Others  Reflective  Bar  type  made  by  OPCOA  and  L[- 
TKONIX.  The  Itu [let-live  Bar  lyju.Ls  are  low-cost  versions 
of  the  MAN1  a  except  .33  character  height!  If  one  LEI> 
blows  you  lew  fii  segment.  MAN'5  you  DO  NOT!  All 
readouts  ft-lo-fl  numerals,  plus  letters  and  decimal. 
"  '  Opcon  and  Li  in  mix  products  jun-fnr-pin  replace- 
ments fi»r  the  MAN-1  and  MAN-J.  A  I  ftV  TTL1 
riimpatihle. 


ff 


SLA-3H 

704 
707 


READOUTS 


TYPE 


MAN-1    equal 


.27 


MAN-1  A  equal  * 


.27 


MAN-3  equal 


.115 


MAN-3  A  equal* 


.US 


IVIAN^M  equal  * 


.127 


MAN-3  equal 


,115 


MAN-3M     equal* 


127 


Color 

Display 


Red 


Red 


Red 


Red 


Red 


Red 


Red 


Dec  mat      Mils 


Yes 


Yes 


Yes 


Yes 


Yes 


+  ** 


Yes++* 


MAN-4  equal* 


.190        Red 


MAN-4  equal* 


.190        Red         Yes*** 


Yes 


2D 


10 


10 


10 


IO 


10 


15 


15 


Driver        Each 


SN7447     $4,50      3  lor  S!2+ 


SN7447        4.95      3  for  $13 


SN744S        2. SO     3  for  $6 


SN7448 


Special 


SN744B        2.50      3  for  $6. 


SN7448        2*SO     3  for  $€. 


SN744S        1.95      3  for  $5, 


SN7446        3.25     3  for  S3 


SN7448        2.75      3  for  $9 


1.95      3  for  $5. 


"REFLECTIVE  LITE  BAR"    (Segment   LLm   Readouts  I 


G    7Q7**    (MAN-1)  .33 

704**    (MAN-4 J  .33 


SLA-1**    (MAN  -1)     .33 


Red 


Red 


Red 


Yes 


20 


Yes 


20 


Yes 


SN7447        3.2S      3  for  SG. 


'    Red  epoiij-  case,  others  clear.   *  *   Lit  rani  x  aJH 

equals  and  electrical  specs  us  MAN-1  or  MAN-  l»  *•*  LED  "'dot'    missing* 


20  15 

Opma's  pin-fiir-pin 


SN7448       3.25      3  for  S6. 


5N7447       3.25     3  for  56. 


HI    slow   rate    op  amp    <T0-5)     .  .  * 

Micro  power  741    (TO  5) 

Micro  power  709    (TO-5)     .,♦.,. 

FET   Input    op   amp    (TO-5)     

Precision  741    TTO-S) , 

Precision  723  voltage  reg.    (DIP) 

5    Times    faster    than    74 IC 

Dual  741    (mini   DIP)  ...,,.*... 

Phase   lock   loops    (DIP) 

Phase  lock   loops    (DIP) 

Phase   lock   loops    (DIP  J    ......... 

Phase   lock   loops     (A)  ...... 

Function    generator     1  A  I      ....... 

Tone  generator  (A)    . 

Four   quadrant   multiplier . 

Hi-grain,   DC  imp    (TO-51 
703C    RF-IF.  amp,    14  ckts    (TO- 5)    .      . 
704  TV   sound   IF  system      ..,*., 

709C    Operational    amp    I  A)     

709CV    Op  amp  (mini  DIP)    <..*.*... 

7 10C    Differential    amp     (A)      

7  HC    Dual   dlff.   comp    (A) 

7  23C    Voltage  regulator   (Al    

733  Diff.  Video  Amp   ........      . 

741C    Frequency    compensator    709    (A) 
747C    Dual    741C     (A)      ... 

748C    Freq.    adj.    741C    (A) 

74BCV    Freq.   adj.   74 IC    (mint   DIP)     ,  , 
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709-7O9    Dual    709C    (DJP)     

739-739    Dual   stereo  preamp 

741-741    Dual   741C    (A)     .   > 

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Here  they  are,  the  Brand  New  1974  Cailbooks.  Both  the  U.S.  and  DX  Call- 
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Buy  your  1974  Cailbooks  today  and  you  will  enjoy  the  very  latest  edition 
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you  will  be  the  loser. 

The  CALLBOOK  is  a  vital  part  of  every  amateur  radio  station.  Over  285,000 
listings  in  the  US  CALLBOOK  and  approximately  200,000  in  the  DX  edition  make 
these  two  volumes  an  indispensable  reference.  Not  only  do  the  CALLBOOKS  list 
QTH's,  but  they  also  have  page  after  page  of  valuable  charts,  tables  and 
maps  all  designed  to  make  your  operating  more  efficient  and  more  fun. 

To    makes    these    volumes    even    more    valuable 

special  service  editions  are  issued  each  3  months, 

^  but  only  to  owners  of  the  1974  CALLBOOKS,  which 

give  complete  cumulative  updated  information  for 
the    1974  CALLBOOKS. 

US  CALLBOOK 


(less  service  editions) 

Just  $9.95 
US  CALLBOOK 

(with  service  editions) 

$15.95 


DX  CALLBOOK 

(less  service  editions) 

Just  $8.95 
DX  CALLBOOK 

(with   service  editions) 

$14.95 


Mail  orders  add  50^  per  CALLBOOK  postage 
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See  your  favorite  dealer  or  send  today  to: 


RADIO  AMATEUR 


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INC 


Dept.  b  925  Sherwood  Drive 
Lake  Bluff,  111.60044 


204 


73  MAGAZINE 


1973  ARTIC 


ARTICLE 


973 


NDEX, 


AR 


CLES 


AMATEUR  RULES  AND 
REGULATIONS 


Ame.  Rules  &  Regs,  I -FCC 

Ama.  Rules  &  Regs,  1 1 -FCC 
Ama.  Rules  &  Regs,  Ill-FCC 
Ama.  Rules  &  Regs,  IV-FCG 
Ama.  Rules  &  Regs,  V-FCC 
Ama.  Rules  &  Regs,  VI-FCC 
Ama.  Rules  &  Regs,  VI I -FCC 


ANTENNAS 

Widespaced  Beam-VE3CFK 
Tift  0verTower-W2ANT 
Quad  construction-WBZHYW 
Toroidal-quad  ant-W4KAE 
Copper  foil  ant-W2EEY 
Roof  mounted  vuhips-WBBHYO 
Fixed/mobile  2m  ant-WB8HEE 
Miniature  80  &  40m  ant-W2E E Y 
Polar  mount  ant-W4KAE 
Triband  quad-K3MNJ 
Logic  &  SWR  -W5JJ 
Double  coaxial  dipoie-W2EEY 
Calibrated  FSM-VE3CES 
Small  yagi  performance-WA3CXG 
450  MHz  power  divider-WA3AXV 
85dBgainani-K1TKJ 
Multi-band  amennas-W2EEY 
Grid-dipping  quads-VE3GSPP 
Single  band  l~p  ant,  (-W4AED 
Novel  160mant-W2JKl,K2EE 
Single  band  L-P  ant,  II-W4AE0 
L'eggsant-WISNN 
Impeadance  meas  w/swr-W2A00 
Easy  ant  pry nning-W3 GAT/2 
2  bandbal.dipole-W2QZH 

Loading  coil  ant-WBFEV 
160m  coupler- W2LT 
Portable  2m  beam-WIBHD 


BATTERIES 

Voltage  limit  sensor- W4UX  J 
FM  battery  pack- K4YKB 
Bart  life  saver-  K2ETN 


95  June 

91  Jul 

87  Aug 

85  Sep 

77  Oct 

103  Nov 

117  Dec 


33  Jan 
73  Jan 
110  Jan 
40  Feb 
73  Mar 

39  May 
63  May 

29  Jun 

59Jun 

63  Jun 

65  Jun 

79  Jun 

85  Jun 

33  Jul 

57  Jul 

71  Jul 

75  Jul 

87  Jul 

21  Aug 

43  Aug 

37  Sep 

61  Sep 

73  Sep 

79  Sep 

57  Oct 

65  Nov 

75  Nov 

89  Dec 


CALCULATORS 

Heath  desk  cal-WA9FPP 
Electronic  calculators-K2QAW 

CB 

CB  alignment  aid-WA5SWD 
220  goes  CB-FCC 


90  Apr 
97  Dec 


87  Apr 

37  Aug 


CIRCUITS,  CIRCUITS,  CIRCUITS 


Circuits 
Circuits 
Circuits 
Circuits- 
Circuits- 
Circuits 
Circuits- 
Circuits 


-Staff 
-Staff 
Staff 
Staff 
Staff 
Staff 
Staff 
Staff 


139  Feb 

132,159  Apr 
105,  143  May 
143 Jun 
102  Aug 
143  Sep 
159  Nov 
120  Dec 


CW 


53  May 
87  Jun 
35  Nov 


Tunable  audio  filter— G8A8R 
Ferrous  CWpump-K6QKL 
Keying  old  xmtrs— W1JSS 
Hybrid  40m  xmtr-WB6BIH 
CW  filter  comparison -W6AGX 
QRPxmtr-WB68IH 
S-meterforHW-7-WABQYU 
3ICkeyer-VE3GSP 
Peak/notch  filter-W6AGX 
Code  speed  display- VE 1BU7W3 
SimplelCkeyer-K2BLA 
CW  filter  design- W6AGX 

DX 

Sunspots  &  future  DX-VE3CEA 
Japan  licensing-WB5EBC 
Europe  on  2m  a  day— W2EEY 
Mobile  DXing-K4TWJ 
DXCC  distrihution-WA9VGS 
73  visits  Jordan-W2NSD 
JY  amateur  listing— JY1 
The  QSL  manager-W4NJF 
Europe's  DXrptr-W2EEY 
Elusive  100countries-VE3CEA 
QSL  from  BY-KA6IX 


85  Jan 

133  Jan 

116  Feb 

55  Jun 

65  Jul 

65  Aug 

53  Sep 

69  Sep 

69  Nov 

25  Dec 

37  Dec 

107  Dec 


60  Jan 
77  Jan 
63  Apr 

53  Jul 
69  Aug 
1 2  Sep 
26  Sep 
91  Sep 
49  Oct 
87  Nov 
79  Dec 


FCC 

Walkerrs  IXU.  speech-W4BW 
Docket  No.  19555-FCC 
Obsenity  pet -W2NSD 

Spectrum  Management-W4BW 
FCC  repeater  info-FCC 
Repeater  maps- USD  I 
Role  of  the  FCC-W2NSD 
220  goes  CB-FCC 


FM  &  REPEATERS 

Obsenitypet.-W2NSD 
HT-touch  tone-WIQDf 
FM  test  set- VE7ABK 
ICidentifier-K20AW 
PLL  tone  decoder -WV6BIH 
Repeater  line  control-WBSBIH 
2m  FM  converter- WB6CDU 
Hipwrtr22-W8FJA 
Repeater  control- K20AW 
Deviation  meters-VE7ABK 
Low  cost  deviation  mrj\-W9HD 
1  and  6w  2m  ampl?fiers-WB4DBB 
Mini-control  system,  I-WA0ZHT 
Getting  repeaters  licensed— W2NSD 
Choosing  your  FM  rig-W2NSD 
Europe  on  2m  a  day-W2EEY 
Scanning  adapter- WA4WTX 
RCA  CMU  15, 450  MH2-WB6BIH 
2m  FM  at  14,000- W7DXX/1 
Repeater  economics-K4AOL 
ISC  FM  xmtr  mod-WB60AM 
Burst  box,  tone  access-WA7NMQ 
45DMH2preamp-WBBBIH 
Led  readout  xtal  SW-WA3AJR 
Go  HR  2  A  portab!e-W2KPE 
1w2mFMxmtr-WB6BIH 
"Mini"  control  system,  ll-WABZHT 

Hand  xcvr  madness-W2NSD 

FCC  repeater  info--FCC 
Non  falsing  decoder-WIELU 
FM  battery  pack- K4Y KB 
Tuneable  L.O.  for  2m  FM-K1CLL 


21  Jan 

24  Jan 
29  Jan 

31  Feb 

46  Jun 

50  Jul 

59  Jul 

37  Aug 


29  Jan 
31  Jan 
65  Jan 
27  Feb 
36  Feb 
60  Feb 

80  Feb 
91  Feb 
35  Mar 

81  Mar 
21  Apr 
31  Apr 
35  Apr 
5 1  Apr 
59  Apr 
63  Apr 
73  Apr 
79  Apr 
83  Apr 

105  Apr 
1 09  Apr 
25  May 
33  May 
47  May 
61  May 
65  May 
71  May 

89  May 

46  Jun 

83  Jun 

87  Jun 

21  Jul 


DECEMBER  1973 


205 


Digital  ID  unit- K10ZS  39  Jul 

Repeater  maps-USD  I  50  Jul 

85dBgainant-KlTKJ  71  Jul 

Tone  burst  squeaker-K9KlC  27  Aug 

Talk  power  and  FM  W2EUP  79  Aug 

Rptr  logic  system-WAI  QMS  27  Sep 

2m  alignment  aid-KlCLL  43  Sep 

Thd  patch  pari-K4MQG  51  Sep 

2MGE  pocket  mate-WB4DBB  13  Oct 

One  IC  2m  from  end-KICLL  21  Oct 

Europe's  DX  rptr-W2EEY  49  Oct 

Freq  mult.  w/xstrs-K1  CLL  69  Oct 

450  MHz,  getting  started-KICLL  21  Nov 

Bat tJite  saver- K2ETN  35  Nov 

Heath  GR -110  scanner- W3WTO  39  Nov 

Legal  autopatch-W3YVV  49  Nov 

12Vdc  supply  for  FM-WA3EEC/J  63  Nov 

Iwatt  HT-1Q0-K6VGP  77  Nov 

2  tone  decoder-W3JJU  81  Dec 

HUMOR 

OX-missimj  made  easy-K9  AZG  7 1  Jan 
Wife,  ham  &  other  woman- La  monica  83  Jan 

Low  temp.  techniques-WlGNZ  55  Apr 


BOB  MANNING 

The  Greenie-KIYSD 

IDENTIFIERS 

Hall  D1  mods-WSGHZ/B 
ICidfintifier-K20AW 
Digital  ID  unit-KIOZS 
Digital  "Hi"  gen-WA6JIVIM 

Using  auto  ID-K6H  KB/1 

MISC.  CIRCUITS 

Lightning  detector-K20AW 
Spinoffs  from  NASA-WB2ICV 
Phase  locked  loaps-W9KXJ 
Neon  bulb  osc  -Weinstein 
Comp.  pair  audio  amp-W5SOT 


63  Dec 


126  Jan 
27  Feb 
39  Jul 
61  Oct 
91  Dec 


85  Apr 
83  Jul 
47  Sep 
67  Oct 
93  Nov 


MISC.  GENERAL  M 

Transformer  cooling-WA0ABI  121  Jan 

400  Hz  transformeni-WBNVM  97  Mar 

Perfect  summer  job-WA8MLG  75  Jun 

Tape  recorder  replay- W6FPO  29  Oct 

Freq.  aperture  mod-W2 BSP  53  N ov 


MOBILE 

Total  mobile  alarm-WA4SAM 
Sine  wave  pwr  inverter-W7GXD 
Roof  mounted  whips-WBGHYD 
Voltage  limit  sensor-W4UXJ 
Mobile  audio  boost-W2EEY 
Simple  auto  alarm-WAI  KDN 
Mobile  DXing-K4TWJ 
Digital  "Hi"  gen-WA6JMM 

POWER  SUPPLIES 

lCprutection-W4ATE 
Updating  nobatrons-W6GXN 
Sine  wave  pwr  inverter-W70XD 
12Vdc  supply  for  FM-WA3EEC/1 
Pwr  failure  proL-fves 
Simple  regulator-KL7EV0 

RECEIVERS 

6m  converter- K1CLL 

Tunable  audio  filter-G8ABR 
IC  10m  tuner  for  VHF-K1CLL 


19  May 
29  May 
39  May 
53  May 
81  May 
97  May 
53  Jul 
61  Oct 


142  Feb 
77  Mar 
29  May 
63  Nov 
73  Nov 
87  Dec 


79  Jan 
85  Jan 
99  Jan 


Improving  Drake  R4A-VE6TW 
Diode  noise  limiter-EI4R 
Improved  AGCsystem-ZL2BDB 
2m  FM  converter-WBBCDU 
Add  filters  to  75  A4-  WO  I  Ql 
Taming  FETs  on  2m-K1CLL 
Tuneable  L.O.for  2m  FM-K1CLL 
2m  alignment  aid- K1  CLL 
S-meterfor  HW-7-WA6QYU 
2mconverter-WB6BIH 
One  IC  2m  front  end-KICLL 
Heath  Gfl-1 10  scanner- W3WT0 
Peak/notch  filter-WBAGX 
Rapid  rcvrcontrol-W2EEY 

RTTY 

Active  filter  applications— W1SN1M 
Digital  tape  distrih  — K4EEO 

RTTY  autoswitch-K2YAH 

SSB 

Speech  processor-WBYBF 
Two-tone  test  gen-W6GXN 
Extended  coverage  HW22-K7JVZ 
Microphone  preamp-WAGGJU 

SURPLUS 
6+2m  surplus  power- K4EPI 
RCA  CMU  15,450  MHz-WB6BIH 
T-44  ATV  system-WBfl  FQF 
2m  GE  pocket  mate-WB4DBB 

TELEVISION 

Polaroid  copier  on  SSTV-K4PRT 

SSTV  circuits,  I -W9NTP 

Receive  SSTV  as  FAX-W6WMI 

SSTV  circuits,  I I-W9NTP 

Can  scanner- K4TWJ 

Dirfict  view  color  SST V-  K4TWJ 

T-44  ATV  system-WBU  FQF 

Mag  deft.  SSTV  monitor-WBSDQT 

ATV,  getting  started -WA7N MO 

SSTV/SSB:!SB-W9NTP,WB8DQT 

TEST  EQUIPMENT 

Another  freq,  counter-KL7GGB/4 

Freq  meas  system,  II-K5DUS 
All  purp  mtr  ckt-WABABI 
Counter  input  ckt-K4E0E 
Light  bulb  watt  meters-WB2GQY 
Freq  meas  system,  1II-K5DUS 
Low  cost  deviation  mtr-W9HD 
19  I C  digital  clgck-WABQVQ 
Improved  K20AW  counter-W9CGf 
Calibrated  FSM-VE3CES 
In  circuit  ohmmeter-WBHDM 
Multiple  freq.  standard-W4H5A 
Low  cost  counter—  Harper 
VOMdesign-WA3JBN 

Photocell  wattmeter- K5CXN 
Meter  legerdemain-  WB2PAP 
450  MHz,  getting  started-KICLL 
VOM  range  extender-W2EEY 
Code  speed  cttsplay-VElBU/W3 
Waveform  generator- VE3GSP 
RFvoftmeter-WA6NIL 
Identify  those  ICs-WASIGU 

THEORY 

Sunspots  &  future  DX-VE3CEA 
Transistor  current  gain-WB4L  VA 


112  Jan 

113  Jan 
115  Jan 
80  Feb 

105  Feb 
27  Apr 
21  Jul 
43  Sep 
53  Sep 
65  Sep 
21  Oct 
39  Nov 
69  Nov 
67  Dec 


45  Feb 
45  Mai 
51  Jun 


47  Jan 

53  Jan 

124  Jan 

71  Dec 


31  Mar 

79  Apr 

29  Jul 

13  Oct 


1 30  Jan 

63  Feb 
20  Mar 
55  Mar 
69  Mar 
49  Jun 
29  Jul 
45  Aug 
26  Nov 
83  Nov 


39  Jan 
49  Feb 

83  Feb 
89  Feb 
102  Feb 
85  Mar 
21  Apr 
55  Mar 
70  Jun 
85  Jun 
91  Jun 

37  Jul 
57  Aug 
63  Aug 

38  0  ct 
43  0  ct 
21  Nov 
59  Nov 
25  Dec 
41  Dec 
53  Dec 
73  Dec 


Understanding  FETs-K9VMH 
Transistor  R F  amps- W9 EGG 
Capacity  measurement- W3HTF 
Time-WBSKFI 
Deviation  meters- VE7ABK 
Bandpass  fitter  design-W86NWQ 
Transistor  RF  amps,  II-W9EGO 
Oscar  6  inv  Ooppler-WBMJS,  Wfl 
Potentio  meters -Centare 
Helical  resonators-WBPSF/8 
CW  Filter  Design-W6AGX 

TOUCH-TONE 

HT-touchtone-WIODI 
The  burst  box-WA7N MO 
The  patch  pad-K4M0G 
Legal  autopatch-W3YVV 

TRANSMITTERS 

Six  band  KW  linear-WA9JMY 
Transistor  RF  amps,  I-W9EGG 
Keying  old  xmtrs-WUSS 
Gonsei201  mods-WBHGX 
6&2  surplus  power-K4EPI 
Compact  linear-KSPVY 
1  and  6w  2m  amplifiers-WB4DBB 
Transistor  RFamps,  II-W9EGQ 
ISC  FM  xmtr  mod-WB6QAM 
1w2mFMxm?r-WB68IH 
6m  5w  amplifier- K1 CLL 
QRPon180kH2?-W5SOT 
220  signal  generator- K1  CLL 
Hybrid  40m  xmtr-WBBBIH 
VHF  pwr  amp  design- K6R AD 
Amateur's  intercom-KICLL 
QRPtransmitter-WB6BIH 
450  MHzexciter-KICLL 

2kw  building  block-WZEEY 
Freq.  mult  w/xstrs-Kl  CLL 
2m  linear  amp-W4KAE 
Microphone  preamp-WABQJU 

UHF  AND  ABOVE 

450MHzpreamp-WB6BIH 
UHF  output  meter-K2EE 
T44  ATV  system-WBQ  FQF 
450  MHz  power  divider-WA3AXV 
45QMHzexciter-KlCLL 
Measuring  microwaves-WA9VFG 
450  MHz,  getting  started-KICLL 
ATV,  getting  starred-WA7NMO 

VHF 
(Also  See  FM) 

6m  converter- Kl  CLL 

IC  10m  tuner  for  VHF-K1CLL 

6&2  surplus  power-K4EPI 

Taming  FETs  on  2m- K1  CLL 

1  and  6w  2m  amplifiers-WB4DBB 

6m  5wamplifier-KJCLL 

220  signal  generator-KICLL 

VHF  pwr  amp  design-K6R  AD 

2mconverter-WB6BIH 

One  IC2m  front  end-KICLL 

Freq.  mult.  w/xstrs-KI CLL 

2m  linear  amp-W4KAE 

Portable  2m  beam-WIBHD 

vjsits 


86  Feb 

97  Feb 
108  Feb 
125  Feb 

81  Mar 
101  Mar 

93  Apr 
LER57Sep 

77  Sep 

49  Dec 
107  Dec 


31  Jan 
25  May 
51  Sep 
49  Nov 


89  Jan 

97  Feb 

116  Feb 

118  Feb 

31  Mar 

50  Mar 

31  Apr 

93  Apr 

109  Apr 

65  May 

83  May 

93  May 

23  Jun 

55  Jun 

31  Aug 

39  Aug 

65  Aug 

71  Aug 

31  Oct 

69  Oct 

29  Dec 

71  Dec 


33  May 
37  Jun 
29  Jul 
57  Jul 
71  Aug 
17  Oct 
21  Nov 
26  Nov 


79  Jan 

99  Jan 
35  Mar 
27  Apr 
31  Apr 
83  May 
23  Jun 
31  Aug 
65  Sep 
21  Oct 
68  Oct 
29  Dec 
89  Dec 


Visit  to  Yaesu-WBBIZF 
60  Jan  73  visits  Jordan-W2NSD 
97  Jan     73  visits  Sentry-W2NSD 


37  Jan 
12  Sep 
81  Sep 


206 


73  MAGAZINE 


PROPAGATION  CHART 

J.H.   Nelson 

Good  (Open)  Fair  (□)  Poor  (O) 

December  1973 


SUN        MON        TUES        WED        THUR 


FRI 


SAT 


i 


2      3      4 


9     10 


6      7      8 


12    13    14    15 


21    22 


2j   [p  H   HI   21    28    29 

30    31     Possible  aurora  79,  20. 


EASTERN    UNITED    STATES    TO 


GMT: 

00 

02 

04 

06 

OS 

10 

12 

14 

18 

18 

20 

22 

ALASKA 

14 

I  t 

7 

G 

3 

3 

3 

3 

7 

14 

1  4A 

144 

ARGENTINA 

11 

7 

7 

7 

7 

7 

14 

71 

7  1 

71 

2T 

1  4 

AUSTRALIA 

14 

78 

78 

78 

7 

7 

78 

7  A 

14 

14 

T4 

14 

CANAL  ZONE 

14 

7 

7 

7 

7 

7 

14 

14A 

21 

21 

21 

14 

ENGLAND 

7 

7 

7 

1 

7 

78 

14 

31 

21 

14 

78 

7 

HAWAII 

14 

70 

? 

7 

7 

7 

7 

78 

7A 

2  1 

21  A 

21 

INDIA 

7 

7 

?9 

70 

7B 

78 

7  A 

1  * 

78 

78 

7 

7 

JAPAN 

14 

7B 

73 

7 

7 

7 

3A 

7 

78 

70 

78 

14 

MEXICO 

1  4 

7 

1 

7 

7 

7 

7 

14 

21 

21 

21 

1  4 

PHILIPPINES 

14 

70 

7B 

78 

78 

7 

7 

7 

7 

7B 

30 

7 

PUERTO  RICO 

7 

7 

7 

7 

7 

7 

1  4 

14 

14A 

I  -1  A 

14 

14 

SOUTH  AFRICA 

7 

7 

7 

7 

7 

78 

i  .1 

21 

21  A 

21 

14 

1  4 

U.S.  5.  R 

7 

7 

3  A 

3A 

7 

7B 

1  4 

1  4  A 

14 

78 

7 

7 

WEST  COAST 

14 

7 

7 

7 

7 

7 

7 

1  4 

71 

21  A 

21  A 

1  4 

CENTR 

al  ur 

JIT 

E[ 

5 

STA" 

fES    TO: 

ALASKA 

1  4 

7 

7 

3 

3 

3 

3 

3 

7 

14 

14A 

! 

21 

ARGENTINA 

1  4 

7A 

7 

7 

7 

7 

7 

14 

71 

21 

21 

*' 

AUSTRALIA 

14A 

14 

78 

7  8 

• 

" 

7  8 

7 

14 

14 

14 

14 

CANAL  ZONE 

14 

7 

7 

7 

/ 

7 

7 

1  4 

21 

2  1 

21 

2  1 

ENGLAND 

7 

7 

7 

3 

7 

7 

7B 

1  4 

•      hm 

14 

78 

7 

HAWA.il 

I4A 

14 

7 

7 

7 

7 

7 

7 

7A 

21 

21  A 

21 

INDIA 

7 

7 

78 

78 

78 

7fl 

7 

7A 

7 

IB 

7B 

78 

JAPAN 

14 

76 

7  0 

7 

7 

7 

3 

3A 

7 

78 

78 

t  4 

MEXICO 

1  4 

7 

7 

3 

3  A 

3A 

3 

7 

1  -i 

1  4  A 

1  4A 

14 

PHILIPPINES 

14 

7B 

7B 

78 

78 

7 

3  A 

3A 

7 

7 

70 

14 

PUERTO  RtCO 

1  4 

7 

7 

7 

7 

7 

7 

14A 

21 

2  1 

21 

14 

SOUTH  AFRICA 

1  4 

7 

7 

/ 

7 

7  Q 

1  4 

2  1 

21 

2  1 

21 

1  4 

U.  S   S    ft . 

7 

7 

3A 

?A 

7 

7 

78 

14 

m 

78 

78 

7 

WESTERN 

UNITED 

STATES 

TO: 

ALASKA 

In 

14 

7 

3 

3           3 

3 

3 

7 

14 

1  4A 

14A 

ARGENTINA 

[   14 

1  4 

1 

7 

7      ' 

7 

14 

14  A 

21 

21 

21 

AUSTRALIA 

Zl 

1  4A 

14 

78 

7 

7 

7 

7 

7A 

14 

14 

14 

CANAL  ZONE 

1  4 

7« 

7 

7 

7 

7 

7 

1  4 

21 

2f 

21 

21 

ENGLAND 

7 

7 

7 

3 

7 

7 

78 

78 

1  4 

14 

7S 

ri 

HAWAII 

21 

1  4A 

14 

7 

7 

7 

7 

3 

7A 

h:i 

21  A 

21 

INDIA 

7 

14 

78 

78 

78 

7 

7 

7 

7 

7 

78 

78 

JAPAN 

2  1 

14 

78 

7 

3A 

3A 

3 

3 

7 

7 

7  0 

14 

MEXICO 

14 

7 

7 

7 

7 

7 

7 

7A 

21 

71 

21 

14 

PHILIPPINES 

21 

1  4 

7B 

7  8 

76 

7 

7 

3 

7 

7 

78 

14 

PUERTO  flICO 

14 

7 

7 

7 

7 

7 

7 

7 

1  4A 

21 

2T 

21 

SOUTH  AFRICA 

1  4 

7 

7 

7 

7 

78 

7B 

78 

1  4 

21 

21 

1  4 

US.S.  R. 

78 

7 

3  A 

3 

3A 

7 

7 

7 

7A 

76 

7B 

7B 

EAST  COAST 

14 

7 

7 

7 

7 

7 

7     |,« 

21 

21  A 

21  A 

1  4 

A  -  Next  higher  frequency  may   be  useful  also, 
B   ■    Difficult  circuit  thfs  period. 


ammer 


from  Reader  Service 


73  will  be  giving  away  a  Windjammer  cruise 
each  month  absolutely  free!  It's  a  vacation  of 
a  lifetime  -  1  0  Windjammin'  days  of  swimming, 
snorkel  ing  and  prowling  uninhabited  beaches* 
They'll  take  you  to  funny  little  places  with 
funny  little  names  .  .  .  Mustique,  Bequia,  Saba, 
Carriacou,  Or,  to  Guadaloupe,  St,  Lucia, 
Grenada  and  Martinique,  And  the  only  thing 
better  than  a  Windjammer  day  is  a  Windjammer 
night.  Soak  up  a  golden  moon,  limbo  to  a  steel 
band  and  fall  asleep  under  a  star-spangled 
Carribbean  sky.  No  stuffed  shirts,  no  plush 
resorts,  just  a  bunch  of  congenial  shipmates 
heading  for  adventure. 

All  you  have  to  do  to  win  is  check  off  the 
advertisers  you  are  interested  in,  on  the  Reader 
Service  coupon  and  send  it  in  to  73.  Well  do 
the  rest.  Each  month  a  winner  will  be  drawn 
from  all  the  Reader  Service  inquiries  received. 

Mail  today!!!!! 


#•••#♦••••••••«••*•  •  * 


•••••*•••* 


DECEMBER  1973 


READER  SERVICE 


Please  either  tear  out  this  list  of  advertisers  and  send  it  in  to  73  with  as  many 
boxes  checked  off  as  you  would  like  to  see  brochures,  data  sheets  or  catalogs,  « 
.  or  else  make  a  copy  and  send  that  in.  Include  your  zip  code,  please.  Send 
money  directly  to  advertisers. 


ADVERTISER  INDEX 

D  Alarm  Components  Dist.   93 

□  Amateur  Elec.  Supply  94,  129 

□  Amateur  Wholesale   128,138 
D  Antenna  Mart  60 

□  Antenna  Spec.  Cover  II 

□  Apollo  62 

*  ATV  Research   69 

D  Autek  82 

□  A&W  Elect.   198,  199 

□  Babylon   180 

□  Barry    123 

□  Call  book   204 

□  CFP   52 

□  Circuit  Specialists    135 

□  Columbia   121 

□  Communication  Specialists    80 

□  Communications  Unlimited  186,  187 

□  Cornell  60 

□  Data  Engineering   139 

□  Den  sen   201 

□  DuPage  FM   142 

D  Dynamic  Electronics  69 

□  ECM   80 

D  Electronic  Distributors  33 
DEL  Instruments  36 

□  Emergency  Beacon  76,  77 
D  E  ricks  on   57 

□  Fair  90 

□  Freck  62 

□  Gam   200 

□  Gateway  32 

□  Genave  96 
D  G  &  G   131 

□  GLB  57 

□  Godbout   127 

□  Goodheart  38 

□  Gregory   188 

□  Hal   69,82,  177 

□  Hall icr afters  24 

□  Ham  Radio  Center   193 

□  Hamtronics   132,  133,  184 
D  Heights  Mfg.  90 

□  Henry    124,  125 

□  H  &  H   80 
D  Hirsch   52 

•Reader   service    inquiries    not    solicited.   Correspond 

directly  to  company.  DECEMBER  1973 

Mail  to: 

Reader's  Service 
73  Inc.,  Peterborough  NH  03458 

Please  Prin  t  or  Type 


Name 


Call 


Address 


State 


Zip 


Coupon  expires  in  60  days 


D   HY-GAIN    136,137,178,179 

□  Icom    182,  183 

□  International  Electronics   143 

□  Jan  33 

□  Janel  60 

□  Jefftronics   134 

□  Jensen  57 

□  Juge   144 

□  KLM   194 

□  KW  Industries   126 

□  LA  Electronrx   Sales   72 

□  Linear  Systems  70 

□  Mann    185 

□  Meshna   140,  141 

□  MFJ   90 
D   MITS   101 

□  Motorola  78 

□  M  tron  60 

□  Newtronics  48 

□  Nichols  116 

□  IMurmi   34 
D  Omnibus  38 
D  Palomar  56 

□  Pemco  82 

□  PolyPaks   203 

□  Porta  Pak  88 

□  QTRonics  80 
D   Regency  40 

D  RGS  Electronics   122 

□  Robot  86 
D  Rohn   189 

*  R  P  Electronics  69 

□  Savoy   Cover  III 
D  Selectronics   192 

□  Sentry  Cover  IV 

□  Signal  Systems  195 

□  Solid  State   145-176 
D  Space  Electronics  98 

□  S&  R    190,  191 

□  Stabler  62 

□  Standard  Comm,   5 

□  TPL  44,  45,  46,  47 

□  TriTek   95 

□  Unadilla  106 
D  Vafpey    111 

□  Vanguard   130 

D  Venus  Scientific   181 

□  VHF  Engineering   196,197 
D  Vintage  Radio   56 

□  Waller  202 

□  Wolf   57 

□  World  QSL  62 

□  Yaesu  39 

73  Stuff 

Digital  Control  Book  110 
Books 

JORDAN  74 
Cassette  Course  1 14 
Subscriptions  1 15 


208 


73  MAGAZINE 


BASSETT 

h  efficiency  mobile 
portable  antennas 
all  amateur  bands, 
',  MARS,  CB, 

urity, 
ilic  service, 

ilNE,  AND 
ERNMENT  USE. 

•6*10-15-20-40-75 

ientical  size,  cost, 
nd  appearance 

ULLY  ADJUSTABLE 

0  FREQUENCY 

1  FIELD 

ow  weight,  low  drag, 
igh  strength 
berglass 

olished 
hrome  brass 
tandard  3/a-24  thread 

igh  gain  collinear 
n  2  meters 


savoy 


MODEL  DGA-2M 

$29.50  postpaid 

in  U.S.A. 


SAVOY 


Postpaid  in  U.S.A. 


F 


TYPE   900  A 


TYPE  901 


HIGH  ACCURACY  CRYSTALS 

FOR  OVER  30  YEARS 

Either  type  for  amateur  VHF  in  Regency,  Swan,  Standard,  Drake,  Vari- 
tronics.  Tempo,  Yaesu,  Galaxy,  Trio,  Sonar,  Clegg,  SBE,  Genave. 

Quotes  on  request  for  amateur  or  commercial  crystals  for  use  in  all 
other  equipments. 

Specify  crystal  type,  frequency,  make  of  equipment  and  whether  transmit 
or  receive  when  ordering. 


BASSETT  VACUUM  BALUN 


J32P 


»»■* 


BASSETT  VACUUM  TRAP  ANTENNA  SYSTEM 

Complete  packaged  multi-band  antenna  sys- 
tems employing  the  famous  Bassett  Sealed 
Resonators  and  Balun  from  which  air  has 
been  removed  and  replaced  with  pure 
helium  at  one  atmosphere.  Operating  bands 
are  indicated  by  model  designation. 

MODEL   DGA-4075  $59.50 

MODEL    DGA-204075  .    $79.50 

MODEL    DGA-2040  $59  50 

MODEL   DGA- 152040  $79.50 


The  famous  sealed  helium  filled  Balun  .  .  . 
employed  with  the  DGA  Series  Antenna 
Systems.  Solderless  center  insulator  and 
easily  handles  more  than  full  legal  power 
while  reducing  unwanted  coax  radiation 
Equipped  with  a  special  SO  239  type  coax 
connector  and  available  either  II  or  4:1, 

MODEL   DGA-20Q0-B  $12  95 

Postpaid  in  USA 


Wi  & 


*    f 


CONTACT  YOUR  DISTRIBUTOR  OR  WRITE  FOR  DATA 

lectronics  Inc 


P.O.  Box  5727-  Fort  Lauderdale,  Florida  - 

Tel:   305-5B6-B416  or  305-947-1191 


Tired  of  Inflated  Prices? 

Check  Sentry's  Pre-Season  Offer  Jo  hold 
down  your  2  Meter  FM  crystal  expenses. 


^■:^■Xv■:^■:-:•^--^^:-:■:'^■>^:■L^^^'^■^^:>:::w^:«.;.:^■^^-^^:^' 


68 


69 


70 


71 


72 


73 


74 


BUY  ANY  THREE  Repeater  or  2  Meter  F 
receive  ONE  CRYSTAL  AT  25%  OFF! 


crystals  at  the  regular  price  and 


NO  PRICE  CHANGE  IN  THE  LAST  5  YEARS  -  and  in  some  cases,  volume 
prices  have  been  slashed. 

UNCHANGING  POLICY  OF: 

■  Warranty  -  Sentry  guarantees  any  Sentry  crystal  to  be  free  of  defects 

in  workmanship  for  an  unlimited  time. 

■  Customer  Service  -  When  you  buy  a  Sentry  crystal,  service  is  part  of 

the  package. 

■  Ease  of  Ordering  -  You  need  only  specify  manufacturer,,  model  and 

channel  frequency.  Sentry  maintains  up-to-therminute  files 
on  all  fixed  station,  mobile,  aircraft  and  marinj  radios. 

■  One  Stop  Shopping     Sentry  offers  a  complete  series  of  amateur, 

general  purpose,  commercial,  precision,  CB,  I.F.,  2M  FM, 
aircraft  and  marine  crystals  (32  KHz  to  210  MHz)  crystals 
to  MIL  3098  also, 
i  Fast  Delivery  —  Any  tolerance  on  any  crystal,  5  workingjdays  for  one 


to  three  crystals.  ' 

All  of  this  "PLUS"  Inflation  Fighting  Prices. 


Or 


def 


O 


«OE°- 


if  you  don't  have  our  1974  catalog,  write  for  yours  today. 

SENTRY  MANUFACTURING  COMPANY 

Crystal  Park,  Chickasha,  Oklahoma  73018 

PHONE:   (405}  224-6780    TWX  -  910- 830- 6425