I
§
Intofnatlonal Editlofi
October 1984 Issue #289 $2.50 USA / $3.00 Canada
r
Down With Towers !
?age 38
ll
Beat It!
3age48
Tri-Band Umbrella j
pase-Fed
tf
9
Pag>j32
Black-ne \ffair
=^age26
)(- Rated A
'age 32
High-Rlse Bonanza
^age 44
•1
Tiinum
74470'65946
Amateur Radb's lechnical Journal
A CWCfl Publication
Troubleshooting— 1 0
Antennas! 9 Articles
Find Fault with Your Coax
Is yoyr cable realEy doing its job? Find out with this elegant detective method.
K
K4IPV 10
The Au^e Parasol Beam
Kl What has twelve comers, three barnis. and uses 140 feet of wire? Hint if s not
a quad ........
W6TYH 20
The Incrediiile Broadband Bowtie
El Tmfv designed for so^ id-state finals, J this 75nn antenna features 50 Ohms at the feed —and less than 1 .5:1 swr across the
band , . , KC3HW
R, for Ailing Antennas
K Maximize your svstem's perfomiance - with this easy-to-constaict noise bridge.
Try low and Behold
Here s a shock: You've been wasting mooey on towers and poles WICV explains why low antennas may outperform high-altitude
aluminum, , WICV/4
26
If 5 just what the doctor ordered, K4! PV 2B
Ryan's Vertical Ecstasy
a Warning: Graphic description of verti- cal antoina array patterns. Explicrt CoCb language May incite construction frenzy.
., WB5LLM
32
38
A No-Holes Barred Beam
What to do when the lease says "'no antennas'": Tum your entire house into a broadside dipole , WA4WDL
omni.
44
Another Eggtieater
[^ I Don't be a VHP weakling. Pump up II^ your performance with this simple 2m
WD5DNL 48
A Tree^Mendous Vertical
T~| Build an BOm DX-getter that really C^ grows on you , KS48 62
When Darkness Calls
On 160m, success means diligent planning. These tips on gray-line propagation are your key to Top-Band DXCC VE7BS 66
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Eggbeatdf — 48 |
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Never Say Die— 6 |
RMlaw— ai |
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73 Intematiofial— 54 |
DX--S4 |
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Barter W Buy— 68 |
Dr, DigHal-l^ |
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Ham H«*p— ea, 71, BO |
Reader Service— Sa |
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Social Event5^69 |
New Ptioducts— 100 |
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Letters- 72 |
Cmtests— 102 |
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Awranis— 75 |
Fun!— 108 |
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FCC— 77 |
Dealer |
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Satellites— 80 |
Dfrectory— 1t2 |
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RTTY Ijoop— S1 |
Propagation— 112 |
H
160-10 MTR lOOW XCVR/ 0.1-30 MHz RCVTl
COMP
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AF CAIN ^ ir CMta K|L ^ icwc mc^Ki fym
GCOCTSI CCM^Fttg
Th« tC<74S r»pfes«nti q mo|i>r brwaklt^rough in th« ham
lnduftTy...a fufi featured HF base station transceiver with a com- bination of standard features found on no other transceiver Jn Its price fange.
Coffipam these exceptlonol ttandafd f#atyjr«i:
• lOOKHz - 30MHz Receiver
• 14 Memories
• 100% Tfonsmit Duty Cycle fransmittei witti exceptioiv otly low distortion
• IF 5h»t AND Pass&and Tuning
• Beceivef Preamp
• 10H2/50H2/1KHZ Tuning Rotes with IMHl bond steps
• Adjuslobie Noise Blonker (wtdth and tevef)
• Contlnuousty Adjustable AQC wlfti an Off position
• FuH hjnction Metefing with a buill-in 5WR Bridge
• Optional Lnfemal AC Power
Supply
Other Stcmdord Feafurtt> Ircluded as standard ore nrKsny of the features rrtost asked fof bv experienced bom radio operators: duot VRJs. RF speech compressor, tunabte notch fitter, oll-rnode squeteh, program borvd scan, merrxyv scan (IrequencY and modes are stored), receiver and trartsmitter irKirenr^ental tuning orxJ VOX KI^OM's proven transceiver designs and technotagy are used in tt^e IC-745 all ham borvd fianscejver wtiich jrjcludes SSB, CW, RTTY. AM leceive and an optiorKil FM plus a 1 0OKHi to 30MH2 genefoi coverage receiver
ICOM Sv^em.
The IC-745 is compatible with fCOM's full lir>e of standard hff accessories.
Accessories ovaftoble inciude ttie iC-PSt5 base supply. lC-fS30 system povwer suppty (swirttchirtg). IC'PS35 inlerrxji pOM^r supply, the HC-2KL lir»©oi amplifier. AT100 outomot ic ontenrxa tunef. AT500 automottc ontenrra tunef. HP1 t>Mdphor»es. and HM12 har>d or SM6 Dose microphor>e
CIpttont. The EX241 marker and EX242 FM moduie. plus a wide variety of filters for shofp audio reception are available
|
'MB |
Oenter |
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|
Fitter |
Wfditi |
Freq. MHz |
|
FL45 |
500 Hi |
9.000 |
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FL53A |
270 Hz |
9.000 |
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FL44A |
2.1 KHI |
0.455 |
|
Fi52A |
SOD Hz |
0.455 |
|
FL54 |
250 Hz |
0.455 |
The IC-745 is I he only trans- ceiver today that has such features standard, .the number of options and occessories availo- ble...arkd such an affofdobiie price.
ICOM
TheWorld System
ICOM Ametico. Inc 21 12-1 16rh Ave N^ Dellevue. VA 96004 (206)454^1 55 / 3331 Tos^v^erwqod Drive. Site 307, Oolkas.TX 75234(214)620^2760
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4 73 Magazine • October, 1984
The HX 1000 makes
tuning in London
as easy as dialing a riHHie.
Direct access keyboard tuning brings a new level of simplicity to shortwave radio. With the Uniden' Bearcat' DX 1000, dialing in the BBC in London is as easy as dialing a telephone. And you can switch from the BBC to Fteruvian Huayno music from Radio Andina instantly Without bandswitching.
Featuring the innovative micro- processor digital technology made famous by Uniden' Bearcat' scan- ner radios, the DX 1000 covers 1 0 kHz to 30 MHz continuously with PLL synthesized accuracy But as easy as it is to tune, it has all the features even the most sophis- ticated "DXer" could want 10 memory channels let you store favorite stations for instant recall —or for faster "band-scanning" during key openings. The digital display measures frequencies to
f
1 kHz, or at the touch of a button, doubles as a two time zone, 24- hour digital quartz cfock. A built-in timer wakes you to your favorite shortwave sta- tion. Or, it can be programmed to activate peripheral equipment like a tape recorder to record up to five different broadcasts— any frequency any mode-while you are asleep or at work
The DX 1000 also includes independent selectivity selection to help you separate high-powered stations on adjacent frequen- cies. Plus a noise blanking system that stops Russian pulse radar interference.
There's never been an easier way to hear what the world
has to say With the Uniden' Bearcat" DX 1 000 shortwave radio, you have direct access to the world.
For the name of your nearest retailer dial toll-free .,J-800-SCANNEa
Frequency Range: lO KHz to 30 MHz connnu- oiisly Tuning: Oirea keytjoard entry, selectable 3 or 24 kHz per revolution knob tuning, or manual step tuning in sefeciable 1 -99 kHz steps. Svntf- tlvlty: 1.0 /uV AM, 0 5 /jV CW/SSB/FM, 1,6^30 MHz Image and IF Rejection: 70 dB or more, Memory: ID frequency capacity. Frequency Stability: Belter than 100 Hz after wajm-up, Modes: AM/LSB/USB/CW/FM AGC: Select Bhle Fdsi .SJo\^ release limes Filler Band widths: 2 7 kHz 6 kH7 anil 12 kHz, Filler Selection Independent of Mode.
uniden
®
Uniden" CorporaBon of A/^e^^ca.
Personal Communications Division 6345 C^stiewey Court. IndJanapolisJN 462S.0
-300
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W2MSD/1
NEVER SAY DIE
ec/Ztor/a/ t>y Wayne Green
ALUMNI DINNER
A ham friend, Bill Ashby K2TKh4/W8ETJ. who wrals arti- cles for my 73 magazine, men- tioned back In the early 60s that he was working for a firm mak^ ing microckcuHs. I think his firm was one of the first In the busi- ness, Wow look where w© arel
Here I am, twenty years later, sitting on a plane coming back from Washington, writing an editorial on 3 picocomputer, Wei It perhaps things aren't all that different, realty. Twenty-five years ago, when t started 73, I used to carry a Hermes Rocket typewriter, which was not much bigger or heavier than my plco (briefcase) computer. The plco has word processing and an ad- dress file, so weVe had some progress,
A lot of oceans have gone under my planes since then, and the world of microelectronics has gone berserk. 256K RAM chips indeed! Solid state was still just getting started twenty years ago, though I remember buying a couple tiny Sony BC/SW radios in Tokyo In 1959.
They worked great, beating the dickens out of the little US-made broadcast transistor radios. Hiat was before integrated cir- cuits, so they had to use eentsy resistors and capacitors.
With the 25th anniversary of my starting 73 coming up in a few months, it seemed like as good a time as any to throw a small party for Wayne Green alumni. I keep running across people in the various electronics industries who at one time or another worked for me— and there have t>een a couple thou- sand. It seemed like it would be fun for us to get together and say hello again. If you know any- one who has ever worked for me, pass along the word, okay?
In 1960, amateur radio was growing at 11% per year^and had t>een for 17 years. There was an intense interest In new tech* nologies, so I thought that a ham magazine devoted to home building and inventing would fly. I had just barely enough money to print and mail the first issue, which fortunately was in the black.
Thfs QSL fc^ues+ car<^ ts atso
KMEHR
16 iT FHftflA A TREC.An^ %4 cud »* wfT HAif^
%i»W THM
QSL OF THE MONTH
Tq witw ywjr QSL mail ii in an envelope to 73, 60 Pine Street, Peterbotough MM 0345B, Attn: QSL o4 ttve Monlti. Winoef^ f9c«jv« a one^year subscriptrcMi (or extef^ioct) to 73. ^itnes not In iftvakspes c^nol t» acc^itd.
6 73 Magazine • October. 1984
I started by doing everything: soliciting articles, editing them, proofreading the type, laying out the pages, selling the adver- tising, writing, printing, and mailing circulation letters, typing stencils for subscrit)- ers — everything. That*s quite a learning experience. I didn't tiave money for going to the movies or eating much, so I made do with things iike home- made oxtail soup, which was very cheap.
A couple years later, I moved the one-man staff (me) to New Hampshire and started recruit- fng used hams. The early ones were college dropouts who worked for the learning experi- ence, room and board, and $20 a week. They helped with process- fng subscriptions, printing names on wrappers, editing arti- cles, proofreading, bookkeep- ing, washing dishes, and so on. I taught them publishing, sold ad- vertising, and cooked three meals a day for the trlt>e. We had up to eight living in and doing the work back around 1963. We had a ball*
When we had a chance, we p[led into our \A/V wagon and headed out tor a picnic, visiting New Hampshire's Polar Caves, Franconia Notch, The Flume, Cannon Mountain, Mount Washington, and so on. We climbed Washington, swam in The Foot Basin— rt was fun.
Down through the years IVe fed hundreds of people into the electronics and computer indus- tries. One runs a very successful satellite-receiving business, another one of the top computer PR firms, and several are maga- zine editors. A call on the PA system at the West Coast Com- puter Faire for ex^Wayne Green
Continued on page 72
STAFF
EDrrOR/PyBLISHER WAyne GFsefi W2H5Dfr
EDrrORlAL Dlft£CTOA
CWC/P ETER BO HOUQH
Jeif DeTray WBfiBTH
EOrrORlAL O^EfUrKS^NS MANAaCR VHCIP ETEnBOflOUG H
EXECUTWEjKAJ^AatMG £D!TOA
Suaian Philbridt
ftSST. MAMAG4NG EOfTOfI
TfCtmiattJPfTERNATIOMAL EtHTOR Perry Donhwri iCKST
EDfTDfllAL ASSlSTAirrS Mancy Uoyj
Chris Sctimtelt MSSOCtATES
John Etfwvrdt K12U an Gcwwr KE7C
Chod Hvrtt VP2ML A-vspf L J&mins wfiiULG Dt. Marc t«»we¥ WA3AJH
Peter Stsfit fQOAW flDberTS<rtrslcrAF2M
AOVERTlSjrfCl
SALES WANAGEfl JifnGnyWIKy
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PRODUCTION Dit^ ECTOR
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ASST. PROOUCTtON hftQR^FQ, Su$an Gross
TYPESErriNG MANAGER
Dennis ChfFs ten asm
FILM PREP Roberl M, V^lt^n^uve
PHOTOGftAPHY MANAGER
Nathaniel Haines
CREATIVE DIRECTOR
Christine Deatr#rfFp«s
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DIRECTOR OF MARKETING AHO SALES DaM Schisal«t
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DIRECTOR OF CHEOn", SALES.
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pacesefre/ in amateur radio
TS-430S "Digital DX-teiity!"
Digital DX-lefity...thal outstanding attnbute built into every KENWOOD TS-430S that lets you OSY from J band to band, frequency to fre- ^" quency, and from mode to mode with the speed and ease that will ^H give you a dominant position in DX _ operations. ^f
KENWOOD'S TS-430S, a revo- lutionary, ultra-compact. HF trans- ceiver has already won the heart of radio Amateurs the world over. It covers 160-10 meters, including the new WARC bands (easily modi- fied for HF MARS), its high dynamic range receiver tunes from 150 kHz- 30 MHz. It utilizes an innovative UP conversion PLL circuit for superior frequency stability and accuracy. Two digital VFO's allow fast split- frequency operations. A choice of USB. LSB. CW. or AM. with FM _ optional are at the operators finger- tips, All Solid-state technology per- j0 mils inputs of 250 watts PEP on ^/ SSB, 200 watts DC on CW, 120 watts on FM (optionaf). or 60 /j watts on AM. Final amplifier protection circuits and a cooling fan are built-in.
Eight memories store frequency, ^m mode, and band data, with LithiumH battery memory back-up, Memory scan and programmabte automatic band scan help speed up opera* lions. An IF shift circuit, a tuneable notch filter, and a Narrow-Wide switch for IF filter setection help eliminate QRM. It has a built-in speech processor. A fluorescent tube digital display makes tuning easy and fast. An alhmode squelch circuit, a noise blanker, and an RF attenuator control help clean up the signal. And there's a VOX circuit plus semi-break-in, with side-tone. AlHn-alt, it just could be that the expression "Digital DX-lerity" is a bit of an understatement. TS-430S Optional Accessories: (n typical KENWOOD fashion, there are plenty of optional accessories for this great HF transceiver There is a special power supply, the PS-430. An external speaker, the SP-430, is also available. And the MB-430 mounting bracket is avail- able for mobile operatton. The
V
AT- 250 automatic antenna tuner was designed primarily with the TS-430S in mind, and for those who prefer to "roll their own^ the AT-130 antenna tuner is available. The FM-430 FM unit IS available for FM operations. The YK-88C (500 Hz) or YK-88CN (270 Hz) CW filters, the YK-88SN SSB filter, and the YK-88A AM filter may be easily installed for serious DX-ing. An MC-60A deluxe desk microphone, MC-80 and MC-85 communications microphones, an MC-42S mobile hand m . , and an MC'55 8'pin mobile microphone. are avaitable, depending on your requirements. TL-922A linear ampli- fier (not for CW QSK). SM-220 sta- tion monitor. PC-1A phone patch. SW-2000 SWR/power meter 160-6 meter. SW100A SWR/power/volt meter 160-2m. HS-4, HS-5, HS-6. HS-7 headphones, are also available. m More information on theTS-430S ' is available from authorized dealers of Trio-Kenwood Communications, 1111 West Walnut Street, pmpton, California 90220.
Bp^tittaauons. and pffces Sfe subjGCi ro change mahout trotitt^ or
n.
MCH
in«A
9 3 n n n n
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^
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m^ •
A
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COM SPEC 'C-107
^
A fresh idea!
Our new crop of lone equipment is the freshest thing growing in the encoder/decoder field today. All tones are instantly progranimable by setting a dip switch; no counter is required. Frequency accuracy is an astonishing ± .1 Hz over all lemper- aiure extremes. Multiple tone frequency operation is a snap since the dip switch may be remoted. Our SS-32 encode only model is programmed for all 32 CTCSS tones or all test tones, touch-tones and burst-iones. And, of course, there's no
need to mention our .^MS^B^BM^fl^ TS-32
1 day delivery and 1 year warranty.
TS-32 Encoder-Decoder
•Size; L25''x2.0"x .40"
• High-pass tone filter included that may be muted
• Meets ali new RS-220-A specifications
• Available in all 32 ElA standard CTCSS tones
SS-32 Encoder
•Size: .9'^x L3" x .40^'
• Available with either Group A or Group B tones
Frequencies Available:
|
Group A |
|||
|
67.0 XZ |
91.5 ZZ |
118.8 2B |
156.7 5A |
|
71,9 XA |
94.8 ZA |
123.0 3Z |
162.2 58 |
|
74.4 WA |
97.4 ZB |
127.3 3A |
167.9 6Z |
|
77.0 XB |
100.0 1Z |
131.8 3B |
173.8 6A |
|
79.7 SP |
103.5 lA |
136.5 4Z |
179.9 6B |
|
82.5 YZ |
107.2 IB |
141.3 4A |
186.2 7Z |
|
85.4 YA |
110.9 2Z |
146.2 4B |
192.8 7 A |
|
88.5 YB |
IM.S 2A |
151.4 5Z |
203.5 Ml |
• Frequency accuracy, ± . 1 Hz maximum - 40''C to + SS'^C
• Frequencies to 250 Hz available on special order
• Continuous tone
|
Group B |
||
|
TEST- TONES: , 600 1000 1500 2175 2805 |
TOUCH-TONES: ■ 697 1209 770 1 336 852 1477 941 1633 |
BURST-TONES: 1600 1850 2150 2400 1650 1900 2200 2450 1700 1950 2250 2500 1750 2000 2300 2550 1800 2100 2350 |
* Frequency accuracy, ± 1 Hz maximum -40'^C to + 85°C
• Tone length approximately 300 ms. May be lengthened,
shortened or eliminated by changing value of resistor
Wired and tested: TS»32 $59-95, SS-32 S29.95
COMMUNlCAnONS SPECIAUSTS
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Find Fault with Your Coax
/5 your cable really doing its job? Find out with this elegant detective method.
Time Domain Reflectom- etry (TDR) is perhaps the most powerfuf method for wringing out a radio transmission line. Profes- sional TOR instruments are expensive and therefore be- yond the reach of amateurs. If you have access to an os- cilloscope, however, you
can build an impromptu TDR unit that will provide at least elementary capability.
TDR techniques can be used to locate faults on transmission lines, measure vswr, and determine the ve- locity factor of coaxial ca- ble. The fault-finding capa- bility is especially useful on
systems containing very long transmission line, or, where the transmission line is hidden for much of its run.
Transmission Lines - Simplified and Revisited
Most amateurs have a ru- dimentary idea Off the na- ture of a transmission line, especially as the term is used in radio-antenna con- texts. On the naive level, we know that it is the cable which carries signals back and forth between the rig and the antenna. On a slightly more technical lev-
el, we find that the trans- mission line can be mod- eled as a complex circuit having both distributed in- ductance (L) and distrib- uted capacitance (C). Fig. 1 shows an equivalent circuit. If dimension ''A'' in Fig. 1 is unit length, then L is the in- ductance per unit of length and C is the capacitance per unit of length. There is also a source impedance, Rs, which is the transmitter output impedance, and a load impedance, Rl* which is the antenna radiation re- sistance.
Fig. 1. Schematic representation of a trarjsmission line.
The K4IPV home-brewed reflectometer. 10 73 Magazine • October, 1984
fig. 2. Coax cable with surge impedance Zq and load im- pedance Zi_.
PUISE OR
$40«ffEl|WE
QDCRATOR
OUTPUT
Fig. 3. Buffer to improve rise time of a signal.
Transmission lines have a
property called either surge impedance or characteristic impedance, either of which is represented by the sym- bol Zq. In the simplest def- inition, surge impedance is the square route of the ratio LtoC:Zo = \/I/C.
Let's consider what hap- pens on a transmission line; see Fig. 2. In this illustra- tion, we have a length of co- axial cable with a surge impedance, Zq, terminated with a load impedance, Zl^ At the input end of the transmission line is a pulse generator. So what normal- ly happens?
We are told that the transmission line acts as if it were infinitely long when Zl = Zo. In that case, a pufse CVp) applied to the input end will disappear into the coax and never return. In other words, the load will dissi- pate all of the pulse's energy when the load im- pedance (Z|_) matches the transmission line surge im- pedance (Zq). This is why we put so much emphasis on a proper match between Zi and Zq, as indicated {hope- fully) by all vswr.
But what of the case where 2l is not equal to Zq? In that case, not all of the energy in the forward or in- cident pulse fVp) is absorbed by the load. Some of the en- ergy is reflected back down the line in the opposite di- rection. Pulse Vf in Fig. 2 is the forward pulse that is ap- plied by the signal genera* tor. When it hits the load end of the fine, some of its energy is absorbed by Zl and the remainder is re- fleeted back towards the foad in the form of pulse Vr. (Note that the pfiase of
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fff
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1 I
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k
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Fig. 4(al Square-wave signal generator.
the Vr is reversed com- pared with Vf J
Radio waves and pulses travel down a transmission line at a known velocity that is some fraction of the speed of light [c). The so- called velocity factor of a transmission line is that fraction. Thus, a velocity factor of 0.66 means that waves and pulses propa- gate in that line at 66% of the speed of light (i.e., 0.66c).
If the speed of propaga- tion on a line is known or can be measured, and if we have a means of timing the interval between the appli- cation of the forward pulse and the return of the re- flected pulse, then we can calculate the length of the tine. If the line is either open or shorted, then the length computed is the dis- tance from the input end and the fault In a long system, such information can save a lot of hunt 'n' check work.
Signal Sources There are two basic TDR
OUTPUT
Fig. 5{al Pulse-generator cir- cuit (block dia^aml
techniques available to the amateur; one uses a real pulse and the other a square wave. Equipment needed for these techniques is rath- er simple, except for the 'scope.
The oscilloscope needs a bandwidth of 5 MHz or more (preferably more). In addition, it must have a hor- izontal sweep calibrated in units of time (e.g., ^/cmj.
The signal source can be any pulse or square-wave generator, either commer- cial or home-brew. In re- searching this article, I used a Tektronix IM-500 series pulse generator a Heath IF-18 square-wave genera- tor, and several home-brew generators (discussed in text). It is highly desirable that the signal source have a fast rise time.
If your oscilloscope has a H-CATE output, then you may already have a pulse generator The +CATE out- puts a short-duration pulse every time the sweep is trig- gered. In the auto-trigger (i.e., free run] mode, the
R3
fi4 2 2K
Fig 4(bl Variable frequency modification.
sweep is cons tan dy retrig- gered regardless of whether or not a signal is present in the vertical channel. Thus, we will see a constant pulse train at the +CATE output during auto-trigger opera- tion.
If you plan to use a
square-wave generator as the signal source, then it may be advisable to im- prove the rise time of the signal. Fig. 3 shows two buff- ers that can be used. The 74H00 is a high-speed ver- sion of the 7400 two-input NAND gate. This device is shown connected as an in- verter (i.e., both inputs tied together). The 7400 is rec- ommended for TTL-compat- ibie outputs.
The 7414 used in Fig. 3 is a Schmitt trigger As such, it will produce a fast rise-time output pulse. Like all TTL devices, there are limits to the allowable input-voltage swings, Note that the Schmitt trigger can be used to make square waves out of sine waves. The Schmitt output is binary, i.e., only two states are allowed, HIGH and LOW. The out- put will snap HIGH when the input passes a certain threshold voltage in a posi- tive-going direction and will drop LOW only when the sig- nal crosses another thresh- old in the negative^going direction.
TRia^ifR fr
put St
OUTPUT
Fig, 5(bl Pulse-^nerator scfiematic.
73 Magazme • October, 1984 11
PULSE GENERATOA
|
OSCILLOSCOPE |
||||
|
tr |
7 |
)« |
^#b -yi- |
©o |
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Fig. 6faJ. lesf setup.
Fig, 4(a) shows a home- brew square-wave signal generator based on the Mo- torola MC4024P voltage- controlled oscillator (vco) chip. Note: this is not the CMOS 4024 device.
The MC4024P contains two vco's, but this project uses only one. The frequen- CY is controlled by capaci- tor CI and is set to approxt- mately the range needed for our application. In some cases we will want to vary the frequency, so we can use the circuit modification of Fig. 4(b), Potentiometer R3 changes the voltage ap^ plied to the vco-control in- put (pin 2). A 3:1 frequency ratio is possible. One use for this capability is op- timization of one of the TDR techniques given be- low.
The output from the MC4024P device is a TTL- compatible square wave. For TDR, however, we can use almost any level within the ability of the 'scope, but the source must have an output impedance that is matched to the transmission line. Impedance matching is the function of R2 in Fig. 4(a) If only one style of coax is being tested, then set R2 equal to its Zq (eg., 50 Ohms, 75 Ohms, etc.); the value of 68 Ohms al- lows testing in 50- and
75-Ohm systems with only a small effect on the system.
The photo shows the ver- sion that I built. In this case only one BNC jack is used, and an external BNC "tee'' separates the signals to the oscilloscope and the cable under test Note that the en- tire system, including the Pomona box, represents on- ly a $1 5 accessory to a stan- dard oscilloscope.
A pulse-generator circuit is shown in Figs. 5ta) and 5(b). Here we see a mono- stable multivibrator (one- shot) driven" by a square- wave source such as the one in Figs. 4(a) and 4{b). The detailed circuit for the one-shot stage is given in Fig. 5Cb).
A typical test setup is
shown in Fig 6(a). The inter- connections between in* stfuments is accomplished by a special tee-box —see Fig. 6(b). The circuitry is housed in a Pomona box fit- ted with three BNC or [if older test equipment is used) SO-239 UHF connec- tors. When building the tee- box, keep leads as short as possible; use "good VHP layout practices/' Note that the tee-box is not needed if you build your own pulse/ square-wave signal source that incorporates similar elements.
TDR Methods
There are two methods by
STlFLECTEO *iB/|
41
VEftT
^
FORWARD pyLSi:
— ®~
J3
P>UL5E
Fig. 6fbJ. Tee-box detaii
which we can use TDR on simple systems. If a pulse- train signal source is used, we will get indications such as Fig. 7= The forward pulse, as applied by the signal source, will have a higher amplitude and sharper fea- tures than the reflected pulse. Coaxial code normal- ly attenuates signal, so one would expect the ampli- tude to decrease. The wave- shape also will change since this attenuation is dif- ferent for different frequen- cies.
Notice that the reflected wave is different in (a) and (b) in Fig. 7. In (a) we see the situation existing when the transmission line is unter* minated, i.e., open-circuit' ed. Here the reflected pulse has the same polarity as the forward pulse. If there is a break in the coax line, then we will see this waveform. The situation for a terminat- ed or shorted line is shown in (b); here the reflected wave has a reverse polarity.
The length of the line can be found from the time T re- quired for the reflected pulse to retum to the point of origin. The following fac- tors affect T: length of the line, velocity factor of the line, and constant repre- senting the speed of light Our basic equation is: L = 983.5VT/2
tIEI.
^r
t^
OSCILLOSCOPE DISPIAT
REFLECTED PULSC
T—
« t I
t
i I
Fig. 7, TDR with a pufse-train signal source
where L is the line length in feet V is the velocity factor (0-1 ), T is the round-trip time in microseconds, as mea- sured on the oscilloscope, 983.5 is the speed of light in feet per microseconds [ft/ fAs\ and 2 represents the fact that T is a round-trip time.
We can rearrange the ba- sic equation to also find T or V, as needed:
V-2M983 5T T^2L/9833V
Let's work an example of each. Let's say we have a long piece of 75-Ohm coaxi- al cable used as a data line between the computer and a CRT video terminal. Your boss knows you catch bul- lets in your teeth and dab- ble in ham radio. You, there- fore, are the resident expert and have to find out where the signal went. Being smart enough to subscribe to this magazine, you remember this article and pull it out You obtain a pulse wave- form similar to (b) in Fig. 7 and measure T as 0.63 mi- croseconds. How far down the line is the short? First we must determine the ve- locity factor Since most TV-type coax is foam, we
Vr
T
I-
--^t «■•■*■
2t * i©
Fig, 8. Adjust square wave to Fig. 9faJ> The adjusted wave- Fig. 9(bl Sum of the forward Fig. 9(c). Load impedance match "A/" form. and reverse voltages. less than surge impedance.
12 73 Magazine • October, 1984
NEW!
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MEWI Bearcat® 201 -E Uniden® PC33-E
Products
Communications Electron ics7
the world's largest distributor of radio scanners, is pleased to announce that Bearcat brand scanner radios have been acquired by Uniden Corp- oration of America. Because of this acquisition, Communications Elec- tronics will now carry the complete line of Uniden Bearcat scanners, CB radios and Uniden Bandif" radar detectors. To celebrate this acqui- sition, we have special pricing on the Uniden line of electronic products.
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The Bearcat 20/20 monitors 40 frequencies from 7 bands, including aircraft* A tvi/o-position switch, located on the front panel, allows monitoring of 20 channels at a time.
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M- See List of Advertisers on psge 98
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ExtTHn'cou.i Signals
Xi^JUXiU
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ExETdtwtius -Signal
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T h e Ban d i 1 5 5 , f eat u res a c on ven f ent bright ness/ dimmer control for comfortable day or n ight driving, plus a handy highway/city control for maximum flexibility wherever you drive. The Bandit 95 Remote, is a two-piece modular unit that lets you mount the long-range radar antenna behind the grifl^ out of view. The ultra- com pact control unit can then be inconspicuously tucked under the dash or clipped to the visorOrder Bandit 55-e Jor$l 1 9.00 each or the Bandit 95' E Remote for $139.00 each,
OTHER RADIOS AND ACCESSORIES
FB-E-E Frequency Directory for Eastern U,S-A S 12.00
FB*W'E Frequency CJirectory for Western U.S.A.. . . S12.00
BC'WA-E Bearcat Weather Alert™. - S35.00
AGO'E Magnet mount n^cbtle antenna S35.00
ATO'E Base station antenna . S3S 00
Add $3,00 shipping for all accesscir/es ordered at the same time. Add $3-00 shipping per scanner antenna.
BUY WITH CONFIDENCE
To get the f mutest delivery from CE of any
product in this ad, send or phone your order directly to our Scanner Distribution Center^ IVlichigan residents please add 4% sales tax or supply your tax I.D. number. Written purchase orders are accepted from approved govern- ment agencies and most well rated firms at a 10% surcharge for net 10 billing. All sales are subject to availability, acceptance and vehfica* tion. AM sales on accessories are final. Prices, terms and specifications are subject to change without notice. AH prices are in U.S, dollarsKOut of stock items wiJI be placed on backorder automatically unless CE is instructed differ- ently, A S5.00 additional handling fee will be charged for all orders with a merchandise total under$50,00. Shipments are F.O.B, Ann Arbor^ Micl^igan. NoCOD's. Most products that we sell have a manufacturer's warranty. Freecopfes of warranties on these products are available prior to purchase by writing to CE. International orders are invited with a $20.00 surcharge for special handling In addition tosh ipping chargea Non-certified checks require bank clearance. Mail orders to: Communications Electron- ics™ Box 1002p Ann Arbor, IS^ichigan 48106 U.S.A. Add $7. 00 per scan ner, radar detector or CB or $12,00 per shortwave receiver for U.P.S. ground shipping and handling in the continental iJ.S.A. For Canada, Puerto Rico, Hawaii, Alaska, or APO/FPO delivery, shipping charges are three times continental U.S. rates. If you have a Visa or Master Card, you may call and place a credit card order Ordertoll-free in the U.S. Dial 600-521-4414. In Canada, order toll-free by callfng SOO-221 -3475. WU I Telex CE anytime, dial 571-01 55. If you are outside the U,S. or in Michigan dial 313^973^8888. Order today.
Scanner Distribution Center" and CEJogo^ are trade- marks of C o nn m u n i cat tons E lectro n ics? Ad # 0 7 0 1 84- E i^ Bearcat is a registered trademark of Uniden Corporation,
Copyright® 1984 Communjcattons Electronics
OrderToll Free...ca
1-800-521-4414
TM
COMMUNICATIONS ELECTRONICS"
?96
Consumer Products DMsion
eia Phoenix n Box 1002 D Ann Arbor, Michigan 48106 U.S.A, C*ll TOLL-FREE 300-521-4414 or auttlt^t US, A, 31 3-e73-e3S8
73 Magazine • October, 1984 13
The Best nctive Antenno COSTS L€SS1
The new ARCOMM AP4 acHre luned Anlenn»/pfe5€lector h the most versatilef best performing ujiil JiVJi liable, ideal for u^e where aul^de antennai ^re not po&stble.
89
95
mctudmig^ F&£E AC adjpfef
FEATURB;
• Tunn 540 KH/ ihru 12 MHz in fouf b^ndi
• tmprova Kf ii^lfHrriviiy a^d imag^ rc-vpcmtpp af ^ny receiver
• Afccipu tip 10 tout cvi^rnjsl anrennj^
• Jntf^ctMl iHti^coping iimenna provides <?i(celltni reiuhs
• Switrhf:dl nulpyl ji« ks pfovided for up lo [lirc'C leceivers
• Operaif* fln intrrnill "J ^/i>lf batterjf trloT inc hjtJt*d} or AC 3tJspier i AC 4]d«iprri iiuludt^d ai nn f?ittriJCDsT
■ Full tvvvlvt? nnintfi timiEed warranty
• Ten d^y ri'iurn pnvitfTge if nor tompletlrly 4iirMiei1
To order, wncl check or money order plin S3.00 £hip|iini; f A rpjidrntt lidd €% uJet Id v. Dejter mquir«^ inviteit
RRComm
24 Valley Street
Lewt&lown.PA 17044
(717) 248-7739
can assume V — 0,8, There- fore:
L = 983.5VT/2
L^(983.5X0.8X0.63)/2 L= 495.7/2 = 248 feet Tracing the line on the building plans, y^^u find the area where the short should be found. Going to that ar- ea, you find a carpenter at work subdividing a room — and find the nail he drove through your coax! You hold off busting hts chops
when you notice the ham- mer in his hand.
You can use the same equation to find the length of coax needed to accom- plish a specified delay. Co- ax delay lines are used of- ten and are a lot cheaper than lumped-constant de- lay lines.
/^
1l < Zq
^o-Zl
\
-N.
UNE UNTEfTWtlATED
H-^
CRUSHEQ C4BLE
\.
SHORTED CABLE
Fig. W. A variety of traces.
It is necessary to know the actual velocity factor (V) of a piece of coax If you are trying to make a quar- ter- or half-wavelength stub, then the velocity factor must be known. For noncrit* ical applications, we can accept the common wisdom factors of 0.66 for regular cable, 07 for Teflon® and 0.8 for foam. But actual velocity factors often differ from these values, so they must be measured.
Make the measurement of T using about 50 feet of cable. The precise length must be known, and the load end should either be left unterminated or ter- minated in a severe mis- matched impedance. This latter stipulation is needed to enhance the reflected pulse. If L and T are known, then V can be computed. If you make enough measure- ments on coax, you will find that published velocity fac- tors are quite nominal and that the range of V for sup- posedly identical samples of cable is quite large. In fact, you may well come to doubt much of the "stan- dard wisdom" published about transmission lines pop- ular in amateur radio.
The alternate method used for amateur TDR uses a square wave rather than a pulse. Adjust the square- wave frequency and the os- cilloscope timebase to dis- play the top portion of the square wave as shown by dimension 'W in Fig. 8. For a perfectly symmetrical square wave, the period will be approximately 2 A, so the frequency will be 1/2A.
In Fig. 9{al the upper waveform represents the ap- plied square wave as viewed on an oscilloscope adjusted per above instructions. The lower trace is the reflected wave.
The display on the oscil- loscope will be the sum of forward (Vp) and reverse (V^} voltages, such as Fig. 9{b). In the case where the load impedance is equal to the
coax surge impedance (i.e, Zl = Zo), the trace will be similar to the upper trace in (a). The trace in (b) repre- sents the case where the load impedance is greater than the surge impedance (Zl > Zq), while 9(c) is that obtained for Z|^ less than Zq (i,e., Zl < Zo).
These traces not only tell us the direction of mis- match but also the approxi- mate magnitude tin the form of a vswr). Using the designations of Figs 9, we can compute the approxi- mate vswr from:
vswr = Vp-f V^^/Vp— Vr
The vswr measurement thus obtained is only ap- proximate because trans- mission line attenuation re- duces the reflected power returning to the transmitter end. This method, like all other methods, produces valid results only when the measurement is corrected for normal attenuation ef- fects and the line is a multi- ple of half wavelength.
Fig, 10 shows the results of square-wave TDR for var- ious situations. Fig, 10(a) shows the situation where Z[—Zq. If the system is per- fect (rare!), then the upper horizontal line In (a) will be perfectly flat. If there are glitches in that portion, then it may indicate anom- alies on the line. I have seen both minor crushes or bends and in-line connec- tors splicing sections of line cause anomalies in an oth- erwise perfect trace For connectors, the glitch may be slight (especially if BNC connectors are used), but it will be present
The traces shown in Fig. 10 demonstrate the wide degree of change of the trace caused by line prob- lems. Although Time Do- main Reflectometers are complex instruments com- pared with our simple sys- tem, our system is capable of giving us a great deal of data about transmission lines that would otherwise be difficult to obtain. ■
14 73 Magazine • October, 1984
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^ See List of Advertisers on page 98
73 Magazine • October, 1984 15
^m
DOCTOR DX
TM
BY
J^SlkJ^^
Work The World With No Antenna
^ ^
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For the active CW operator, there is nothing more fun than operating with the "Doctor DX*' CW DX simulator. For the person who has never liked CW, Doctor DX will show you what real fun is. Doctor DX has something for everyone from the aspiring Novice to the experienced Amateur Extra Class licen- see. And you need no FCC license to operate Doctor DXi
With Doctor DX, al I you need is a Commodore-64 com puter, a key (or keyer), and a TV set. There is no need for an expensive transceiver, amplifier and antenna farm to enjoy the thrill of working "rare DX.'' No more TVI or dead bands! Doctor DX Is more than the most sophisticated CW trainer ever devel- oped, it is your DXpedltion ticket to anywhere in the world at a very affordable price*
Doctor DX simulates real H.F. CW band conditions. Aii the stations you will work are generated by the computer. As you tune up and down the particular band you have selected, you will hear realistic sounding stations in contact with other stations (some within your skipzone). There is also the normal QRN and QRM one would expect to hear in the real world. All call fetters heard are totally random (sub- ject to the country's callsign assignment rules). The prefixes are weighted according to the Amateur Radio population density, with 304 possible countries represented. The speed of stations operatfng in the lower portion of the bands is much faster than those operating in the upper band segments. The "operators'' are also more polished in the lower portion of the bands.
Radio propagation (programmed for each band) represents what you would expect to hear on a good propagation day at the peak of the sunspot cycle. The propagation follows the Internal real-time clock that you set before beginning operation. All the simulated stations you hear (with proper pre- fixes) are at distances you would expect to hear for the time of day and band selected.
You can learn and enhance your CW operating skills with Doctor DX. Doctor DX will not reward bad habits, AEA even offers an awards program to owners of Doctor DX that work all zones, 100 countries, 5 band Dr DXCC, or Doctor DX Honor Roll.
The Doctor DX CW trainer is a totally new concept in Amateur Radio. See what all the excitement is about. Send for full details, and see your dealer for a demonstration.
Send Us Your QSL Today And Ufe Will Rush Full Details!
Advanced Electronic Applications, Inc.
RO. BOX C-2160 • LYNN WOOD, WA 98036 (206) 775-7373 • TELEX: 152571 AEA INTL
Brings you the Breakthrough!
Doctor DX "Challenge
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fws ifiijf diiv 5iiJmiiiMid[proptT t^vklencc to Aij^K s-hmi'lti^ siicci'ssfui twp-vmv cortMci^ with at d^iv^l WO dljfcmn pTv^ C01UUTO2S rni ifm Doctor DX"
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For good clean, competitive fun. Doctor DX^"^ shows your score and QSO rate for continuous moni- toring of your improved CW operating skills. The DDX-64 can be a vehicle for fairly settling those club rivalries by competing with your friends under identical operating conditions.
AEA also has two on-going CW contests that you can enter with Doctor DX as your own schedule permits. The AEA SPRINT CONTEST is a timed nonstop eight hour event and the AEA MARATHON CONTEST is a timed 24 hour non-stop event. The top 5 contest scores will be published in our future advertisements and upgraded periodically as new higher scores are achieved.
In addition to the two AEA contests, we are offering award certificates for achieving certain miie- stones. You will be automatically alerted when you have achieved these milestones by a display at the bottom of the monitor screen.
AEA DrDXCC is achieved when you have worked 100 different countries, regardless of the frequen- cy band or the amount of time operated. DOCTOR DX WAZ can be earned by working alt 40 CQWW zones of the world, without regard to the band or duration of operating time. The DOCTOR DX HONOR ROLL is reserved for top notch operators capable of working 250 countries without regard for band or operating time. Additional endorsement awards are available for each additional 10 countries worked up to 300 (out of 304 possible) countries. AEA 5 BAND Dr DXCC is a very difficult award to achieve. It re- quires working 100 countries on each of five different bands, without regard for the amount of operat- ing time*
Each award can be obtained by filling out a photocopy of the award application form (supplied) along with the score information and qualifying check sum from your screen display. Please enclose $3.00 to cover handling costs for each certificate ($1.00 for Honor Roll endorsements). Awards will only be granted to owners having a Doctor DX warranty card on file.
There is no need to ever be bored with your hobby again just because the bands are dead or you are apartment bound. Try Amateur Radio's own version of Solitaire - DOCTOR DX.
Advanced Electronic Applications, Inc.
P.O. BOX C-2160 • LYNN WOOD, WA 98036 (206) 775-7373 • TELEX: 152571 AEA INTL
Brings you the Breakthrough!
FIRST WITH US ,
THEN THE WORLD!
Better communications start with your subscription
to §^ Amateur Radio's Technical Journal
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Start my no-risk subscriprion today and send me 12 issues of 73 for $19.97. 1 understand [that with payment enclosed or credit card order I will receive a FREE issue making a ^ total of 13 issues for $19*97.
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I'cir^ipi Mrniail pl«Hf iufuifc Please alio* Mi u^eki fm ddiwrr-
73
Amateur Radio's Technical Joumal > PO Box 931, Farmingdato, NY 11737 ^
18 72 Magazine • October. 1984
p
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See Lht of Adv&rtis&rs on page 98
73 Magazine • October, t9&4 19
Harry D. Hooton W6TYH 1420 Shamrock Ldne Lincoln CA 95645
The Aussie Parasol Beam
What has twelve corners, three bands, and uses 140 feet of wire? Hint: Ifs not a quad.
The Australian ham with Novice-license privileges is limited to certain frequen* cies and very low antenna power— somewhere in the vi- cinity of 20 Watts PEP. Nev- ertheless, many of these Nov- ices (not necessarily begin- ners in electronics) produce outstanding signafs all over the globe on the 10- and 15-meter bands. Some of these stations, such as VK7KDR (formerly VK7NDRI VKZNRa VK3VCW, and others that I have worked over 100 times, have spent many hours hand-honing their antenna systems close to perfection.
During the years 1978 through 1982, when I was
on the air every day. there were many VK Novice sta- tions that consfstenlfy fa id down S9 + signals at W6TYH, My curiosity be- ing aroused, I contacted most of these hams and found that they were using the VK2ABQ ''parasol" beam antenna described by Fred VK2ABQ in the Oc- tober, 1973, issue of Elec- tronics Australia.
1 wish to express my grat- itude to the many VK hams who mailed me photo- copies of the original arti- cle and others that showed more recent modifications of this unusual antenna system.
C DIRECTOR
jmSULATQR
IftlSULATOH
FlEOIVIf^
Fig. 1. Australian parasol beam antenna. Construction is similar to one frame of a cubical quad, but plane of loop is parallel to surface of the earth. Array is horizontally polarized,
20 73 Magazme * October, 1984
One of the features of the parasol array that first caught my attention was
its small, compact size. I immediately had visions of a 40-meter beam using a parasol-type loop. It is also suitable for the ham who wants a triband antenna system but is cramped for space. Because it is very fight, when constructed with ordinary copper-wire conductors and bamboo or fibergfass spreaders, it can be rotated with a heavy- duty TV antenna rotator
To satisfy my curiosity, f built and tested a dual- band parasol array with loops for the 10- and 15- meter bands only. Al- though the installation was not permanent, the follow- ing data should be of in- terest to all hams who de- sire a low-cost, simple, and low-weight antenna system for the three highest HF bands.
Antenna Design As shown in Fig. 1, the
parasol antenna consists basically of two wire con- ductor elements, each of which has its ends bent in- ward at right angles to the center section. Since most of the radiated field from an antenna element ema- nates from the center por- tion, the radiation efficien- cy is not noticeably poorer than that of a given ele- ment that used inductive traps or other shortening devices. As shown here, the parasol array is a modified 2-element yagi, using a driven element and a para- sitic director.
The Australian versions of the array are fed directly at the centerfs) of the driv- en efement(s) with 720hm coaxial cable. Although no specific swr figures were included in the photocopy material received from Fred VK2PHQ, I have been informed that the line swr is not greater than 2.5:1 when the three driven-ele- ment feedpoints are con- nected in parallel and fed from a single 72-Ohm line.
|
Frequency(MKz) |
A |
B |
C |
D |
E |
F |
|
|
7.t5 |
*6'7" |
8' |
2" |
9'9" |
46' 7" |
25' |
16' 9" |
|
14.3 |
23' 5" |
4' |
1" |
4' 10" |
23' 5" |
12' 6" |
8' 4" |
|
21.3 |
15' 8" |
2' |
9" |
3' 3" |
15' 8" |
8'5' |
5' 8" |
|
28.6 |
118" |
2' |
2' 5" |
irs" |
6' 3" |
4' 2" |
Table 1. Approximate dimensions of elements and spacing for 40-, 20-, 75-, and 10-meter parasol beam antennas.
TRIM ASRECfJiREO TO RESONATE Et-EMENT
FEED DRIVEW LJ ELEMENT
Lh JCi«4
tjt-
^
INSULATOR
DRIVEN ELEMEfJT
DIRECTION OF MAXIMUM RAD I AT I QN
F/g. 2. Ceneral arrangement of parasol beam antenna.
In the W6TYH experimen- tal version, tHe driven ele- ments were fed by separate gam nn a- match arrange- ments, the coaxial line be- ing switched from one to the other by a stepping relay. It should be possible to ''match" the 72-Ohm (or 52-Ohm) coaxial line to the three feedpoints at a prac- tical usable swr value by attaching a suitable coaxial line transformer to each feed- point and connecting them in parallel at the end of the main transmission line.
The length of the folded, or bent, end sections will depend on the spacing be- tween the driven and para- sitic elements. In the W6TYH experimental ver- sion, the spacing (free space) between the centers of the driven and parasitic elements was made 0.11 wavelengths to keep the overall size as small as pos- sible. Table 1 gives the di- mensions of the parasol ar- ray for one-, two-, or three- band operation. The ele- ment lengths, particularly in the three- band arrange- ment, are approximate and should be ''dipped'' and trimmed to resonance as described later.
The approximate dimen- sions A, B, C, D, and E of Fig, 2 can be calculated by the following formulas. As- suming insulators II and (2 are 4 inches long, with F be- ing the frequency in MHz and A to E dimensions are in feet, A = 335/F, B =
58.3/F, C = 69.7/F, D = 335/F, and E = 178.75/F.
It must be emphasized that the above dimensions are approximate but will be close to the actual oper- ating values. The ends of the element conductors can be made about 3 or 4 inches longer than the cal- culated values, as shown at B in Fig. 2, and then trimmed to resonate the el- ement at its proper fre- quency. In most cases, the director element will func- tion satisfactorily when cut to the calculated value or about 5 percent shorter than the driven-element length.
Practical Construction
To start, you will need one spider or X mount, such as those used in the construction of the cubical quad antenna. You also will need four crossarm (spreader) sections, as shown. Each crossarm should be at least 14 feet long if a triband 20-15-10- meter array is to be con- structed. The crossarm drilling data can be found as dimension E in Table 1. Ail of the wire elements should be strung on the frame before attempting any resonance adjust- ments.
With the array at least 8 or 10 feet above the ground, start with the IO- meter driven element and resonate it as described in the next section. Next, res- onate the 15-meter driven
3/'4 i n .
CRia-DIP
MlNJfiTURE COPPER
"alligator" clips
COrJDLfCTORS
LEAD?
NOT OVER t/2 in EACH
LINK
COUPLING — ADJUSTABLE-
t TURN LtffK, SOFT COPPER WIRE ^
OIAMETER SO THAT LfNK SLIPS OVER GRID'OIP OSCILLATOR COSL
Fig. 3, How the grid-dip oscillator is coupled to the feed- point of the driven element (see textl
element and recheck the resonant frequency of the 10-meter driven element Third, resonate the 20-me- ter driven element and recheck the resonant fre- quencies of both the 15- and 10-meter elements. In the prototype array at W6TYH, the interaction be- tween the three driven ele- ments was negligible as far as the dip meter indication was concerned. However, when each driven element was being adjusted for low- est reflected power at its feedpoint, the swr reading changed when the match- ing adjustments of the other driven elements were moved.
It is likely that the great- est interaction will take place when all three feed- points are connected in parallel and fed by a single coaxial transmission line. If the line swr is not higher than 2.5:1 on the element with the highest swr, usual- ly 20 meters, the perfor- mance of the array will not have deteriorated to any great extent and an anten- na tuner can be used at the transmitter end to present a 50-Ohm-resistance load to the transmitter output terminal.
Resonance Adjustments
As in any other parasitic array, the parasol antenna will give optimum perfor- mance only if the driven and parasitic elements are resonant at their proper frequencies. The length di- mensions given for the par- asitic director elements are about 5 percent shorter than those of the driven el- ement In the prototype ar- ray, the parasitic directors were calculated and cut according to the formula. The directors performed satisfactorily without fur- ther adjustment. The driv- en-element lengths re- quired adjustment howev- er, as outlined below.
The preliminary driven- element adjustments are most easily made with a grid-dip oscillator and a calibrated receiver. First, make a 1- or 2-turn link coil from no. 14 soft-copper wire and with a diameter small enough to fit snugly over the grid-dip oscillator coil. As shown in Fig. 3, the link-coil ends are fitted with small copper alligator clips. Connect the alligator clips to the center ends of the driven-element con- ductors, as shown. Slip the
|
Parts List |
||
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140 feet, no. 12 copper wire, plastic |
||
|
covered household type |
@ 10q; per ft. |
$14.00 |
|
4 bamboo spreaders |
@ 50(t ea. |
2.00 |
|
1 marine plywood, 3/8" x 18^' x 18" |
@ $2.00 |
2.00 |
|
4 carriage bolts, 4-1/2" x 1/4'^ |
@ 30$ ea. |
1.20 |
|
4 carriage bolts, 2-1/2" x 1/4'^ |
@ 25(5 ea. |
1.00 |
|
4 U-bo!ts, 1-1/4^* |
@ 75(C ea. |
3.00 |
|
MiscBllaneous (alligator clips, etc.) |
2.00 $25.20 |
|
|
Note: 52- or 720hm transmission line and insulators not tn- |
||
|
ciuded in above totai |
73 Magazine • October, 1984 21
f
-VIEW A
CARRtacf aOLT 4flE0UinED-
'KIKC^POST Un.0IA.,^4in. LQNS DRIVE miQ I in. HOL^ IM CEMTEFt DF BLOCK
OftlVEM
ELewE^fT
HVLQM f I^HINC LINE
■UPPER SLOCK
SPBeA0£ff5
BAMBQO OR F^BERetA.^ ILH. DIA. J4m. LON& 4 BEOUIRED- SEE T£)CT
!iySin. MARINE PLYWOOD ES )e IS ii9.
LOWER ORE'GiChN BLOCK 6X6X1 Ui-i-n,
ll/Zin.PIPE FLANQt
MAST
i Ifi In, ptA. itHiK I^IPE
VJf W A
U-BOLT
■4\f^ CARRIAGE HOLT fliND WflSHEH
/
\
Fig. 4. Array assembly, parasol antenna.
link coil over the grid-dip coil form, and rotate the grid-dip oscillator dial until a deep null or "dip'' is in- dicated.
With the calibrated re- ceiver, check the grid-dip oscillator at the point where the null occurs. Dur- ing this first check, the res- onant frequency of the driven element is almost certain to be very close to, or outside, the lower fre- quency limits of the ama- teur band. Clip off half an inch or so of the excess wire at the support insula-
tors and repeat the pro- cess. Be sure that you check the grip-dip oscilla- tor frequency with the cali- brated receiver each time that a dip is indicated. Do not depend on the calibra- tions of the grid-dip oscilla- tor dial as the oscillator will be pulled off calibra- tion by absorption of the rf energy by the driven ele- ment at its point of reso- nance. This pulling effect can be reduced by reduc- ing the coupling between the grid-dip oscillator and the link coil to the point
L-i^r
eiin.LEMGTH^, T^ OHM COAXIAL LIKE
UmECTOR ELEMENT CENTERS STAPLED TO WOODEN BOOM AND ELECt^CALLT aOMED WITH SINGLE -CONDUCTOR WIRE
I I WOODEN BOOM
( 1 1.5 X 1.5 iTi. K aft.
II
DIRECTOR
Fig. 6. Modified version of Australian parasol antenna (said to improve front-to-back ratio).
22 73 Magazine • October, 1984
DftlVEN ELEMENT
CENTER
INSULATOR
LIGHT
NYLON
LINE
DIRECTOR
OlRECTOft
Fig, 5. Original Australian feed arrangennent.
where only a very sma null is indicated.
Continue to trim each end of the driven element and check the grid-dip os- cillator frequency at the null until the element is resonant at a frequency about 50 kHz lower than the desired operating fre- quency. The driven-ele- ment resonant frequency can then be ''worked in/' or "fine tuned/' to exact reso- nance at the operating fre- quency during the match- ing adjustments.
During the adjustment of the driven element for resonance, it is possible that the grid-dip oscillator may indicate two nulls- one deeper than the other The major null will indi- cate the frequency at which the driven element is resonant. The minor null will be somewhat higher in frequency and will be the resonant frequency of the director. With very close coupling between the pick- up loop and the grid-dip os- cillator coil, the minor null should be pronounced. When the coupling be- tween the link coil and the oscillator coil is reduced, the minor null may not be apparent. The minor null should occur at a frequen- cy about 5 percent higher than that of the driven el- ement.
Mounting the Array
In the original Aussie
version of the array, the spreaders were mounted on an 18" x 18'' x 3/8" piece of '"bond wood" (ply- wood) as shown in Fig. 4, If the plywood mount is used, it should be good quality nnarine plywood. The cen- ter of the board was rein- forced by a pair of 6" X 6'' X lAIT' "Oregon" blocks. The upper plate has a 1-inch hole at the center for the 1-inch-diameter dowel kingpost. The king- post is about 24 inches high and is sanded to fit tightly when driven into the center hole of the upper block. In the VK version, the spread- ers were made from 1-inch hardwood dowels. Most American hams will prefer bamboo or fiberglass spreaders. Each spreader is supported at two points, as shown, by heavy-duty ny- lon fishing line; hence the name, "parasol array "
Feed System
The original Australian feed arrangement for the three driven elements is shown in Fig. 5. Here, the three driven elements use a common center insulator with the three feedpoints connected in parallel and fed with a single coaxial transmission line. A nylon tie cord is connected be- tween the driven-element center insulator and the center point on the parasit- ic director [or reflector, as the case may be) and is drawn taut. The center
points of the three direc- tors (reflectors) are electri- cal [y bonded together.
Another VK arrange- ment is shown in Fig, 6, Here, a light wooden boom, 1-1/2" X 1-1/2" X 96'', is used to support the driven-efement center insu- lators. The three feed- points are connected to- gether with short lengths of 72-Ohm coaxial cable. The center points of the direc- tor (reflector) are attached to the wooden boom, as shown, and connected to- gether electrically with a single copper conductor
Antenna Performance
The W6TYH parasol ar- ray was constructed to sat- isfy my own curiosity, more or less. Although the antenna was a jerry-built affair mechanically and was suspended by a rope and pulley attached to an overhanging tree limb, it was electrically correct.
On the 15- and 10-meter bands its performance was compared with that of a "standard'' 2-elennent yagi similar to the one I de- scribed in "Rotary Beam for 10 or 15: the LB-2" [73 for May, 1980X and in most cases there was little dif- ference in the strength of the distant signal. The ex- perimental model ap- peared to have about 5 dB forward gain and about 15 dB front"to-back ratio — about the same as that of the 2-'element yagi used for comparison. The Austra- lian hams rate this antenna at 5 dB forward gain, 18 dB front-to-back ratio, and 37 dB side rejection when used on the 15-meter band. At any rate, the parasol antenna is probably the least expensive tribander. It should be possible to build it for not over twenty to thirty dollars. It can be rotated easily with a TV an- tenna rotator. ■
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73 Magazine * October, 1984 23
^254
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24 73 Magazine • October, 1934
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'0 EKNTM^FI. SV^tF-MS; |
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New Technology {patent pending) converts any VHF or UHF FM receiVef Fnto an advanced Doppier shift radio direction tinder. Sinnply plug into receivers antenna and external speaker jacks. Uses four omnidirectionaJ antennas. Low noise, high sensitivity for weak signal detection. Call or write lor full details and prices.
rS DOPPLER SYSTEMS, INC. 5540 E. Charter Oak, k-/ _ Scottsdale, AZ 85254
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TUBES
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s^iNICORN ELECTRONICS
10010 Canoga Ave., Unit B-8, Chatsworth. CA 91311
(818) 341-8833
Minimum order St5 00--No shipping charges on prepaid orders— COO add Si 00— UPS Bfue add S3 00— Calif rpsidpnis add 6'?% safes ta* Personal checks held (or ctearance VISA MC SEND FOR A FREE CATALOG
See Ust of AOveflisers on page 96
73 Magazfne- * October, 1964 25
The Incredible Broadband Bowtie
Truly designed for solid-state finals, this 75m antenna features 50 Ohms at the feed— and less than 7.5:7 swr across the band.
//m Barton KUHW RD #2. Sox 131 Washin^on PA 15301
ii'^eah, I've got a tran- I sistorized transceiv-
er .
ff
'^Do I like it? Sure, I like it alot . "
'What do I think of the solid-state finals? Well they are not as great as they sound. The finals are really
sensitive to swr. I ended up buying an antenna tuner just to get the thing to load up/'
If you're the owner of an alf-transistor rig, you've probably had a Q SO like the above. While these rigs are nice, they do have their own set of problems. Chief among the problems is their best known feature— the sol- ids tate final amp.
Transistor rigs differ sub- stantially from their tube- final cousins. Tube finals use an impedance-matching
Swr mefer showing the 5wr (the tun& was bypassed], 26 73 Magazine • Octot)er, 1984
(pi) network to match the tube's impedance to the antenna's impedance. Tran- sistors do things another way. Power from the broad- banded final transistor is fed through a bandpass filter in- to a 5{K)hm load.
This new system means that theoretically you can set the tuning dial to any fre- quency and generate a sig- nal with no further adjust- ment to the transmitter. This possibility intrigued me be- cause I enjoy rag-chewing on 75-meter phone and I op- erate a transistorized rig. However, a little experi- menting showed me that it wasn't going to be as easy as it sounded. There's a catch.
White the transistor finals are broadbanded, they re- quire that the load they feed be 50 Ohms or very close to
m
^M
^h
0
1
EaUIVALf KT CtffCtilT FOR A DJm»LE AlfTEMMA.
RESONANT rireguciiCY oCPCuas mwi values
Of L AMD C.
Fig. t
it Unfortunately, a dipole antenna is not broadband- ed. Keeping the swr low as you tune across the band — that's the catch.
According to the theory books, a dipole should be able to cover a band equal to three percent of its design frequency. That's 100 kHz on 75 meters without ex- ceeding a 2:1 swr. Thaf s not much of a spread.
1 decided that what I needed was a broad banded dipole. The design require- ments were:
1. Uses no exotic or ex- pensive material.
2. Easy to construct
3. Achieves a 13:1 swr or less over the 75-metef phone band.
Design requirement num- ber one eliminated double bazookas and folded di- poles. They require expen- sive coax and ladder line or an impedance-matching net- work, I wanted to keep it cheap and easy.
As I searched, my mind wandered back to a short blurb in William Orr's Radh
Handbook. In his descrip- tion of a tuned doublet an- tenna, he mentioned that the antenna could be made more broadbanded by fan- ning the ends of the anten- na. Could the answer to my search be a simple adapta- tion of this idea? I decided to find out
To start ' cut enough wire for two dipoles. The two di- poles were tied together at the center insulator while the legs were fanned one foot apart. Swr measure- ments indicated that I was heading in the right direc- tion although there were a couple of problems.
The first problem was that the new combined di- pole was too long. The old dipole formula just didn't work In this situation. This change was an unexpected confirmation of a lot of the antenna theory I had learned.
Remember that an ante^^ na b equivalent to a series- resonant circuit. In fact we could substitute a series-LC circuit for an antenna as in Fig. 1 . The resonant frequen- cy depends upon the values of L and C. If either L or C changes, the resonant fre- quency shifts.
Now lefs go back to a real antenna. The LC rela- tionship still applies. By spreading the ends, we have increased the antenna's ca- pacitance. This, of course, shifts its resonant frequen- cy. The only way to bring the frequency back is to com- pensate by changing the in- ductance, too.
Inductance is changed by shortening the antenna. In this case, the antenna had to
be shortened a total of ten feet to bring the frequency back. It's the reduction of in- ductance, incidentally, which increases an antenna's broad- bandedness.
The second problem was mechanical — how to keep the antenna in its proper po- sition. On my first attempt I used strips of wood to
^ See Ust ot Advert fs^rs on page 98
spread the antenna ends apart by about one foot with a halyard attached at the center. This worked, but when hoisted into the air, the ends wanted to wind- milt twisting the wires to- gether and reducing capaci- tance.
No sweat. I just hung a brick to the bottom of each spreader. That solved that problem but created anoth- er. The whole thing took on a Rube Goldberg appear- ance; it was a visual embar- rassment Besides, there was the practical problem of having these two bricks suspended forty feet in the air on the ends of some rope. Needless to say, the XYL was quick to point out these problems, too
Eventually both problems
were resolved with the de- velopment of the "Broad- band Bowtie Dipole" seen in Fig, 2, One look at the draw- ing should explain how the antenna got its name.
After numerous cuts and tries, I found that one-hun- dred-ten feet seemed to make the antenna resonant about the middle of the 7 5- meter phone band. Ex- periments also showed that fanning the ends more than three feet offered little or no advantage. With the ends fanned three feet rtiy swr was less than 1 5:1 on the edges of the phone band (see Fig. 3). Now my tran- sistor finals perk happily along with no need to tune.
Length of the transmis- sion line is also important To have your transistor transceiver see the same im- pedance as the antenna of- fers, the transmission line must be some multiple of one half wave. For solid di- electric RC-58, this is a mul- tiple of eighty-three feet
Mounting problems were solved with the double-hal- yard system also shown in Fig 2. Rope spreaders re- place the original wood spreaders. Be careful not to put too much tension on the
HOPE SPREAOeA
muMTAiitiNe
^Ff^n MAtYJtRD
Uim£ft HM.vt*sm
COAX TO ttUHSIilTT^n & 9311
Fig. 2,
J.6
I 0
yj^OiAHi
4 OOOMHI
S*H REMHtMS eCLOW l^i OVEfl THE ENTIRE SEVEIVTf FIVE METEfl PHONE BAND.
Fig. 3.
lower halyard or the whole system will be dragged closer to the ground.
Incidentally, those inter- ested in antennas might like to know that all antennas at station KC3HW are made from electric-fence wire. This 18-gauge steel wire comes on quarter-mile spools and is long-lasting. Ifs available through farm-supply stores
and Sears for about ten dollars a roll.
More avenues of experi- menting are open to you, the reader. How about a higher band? While Tve not attempted to try the Bowtie on forty meters, it should have a flatter swr than on seventy-five
Best of luck, and enjoy your newfound freedom, ■
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73 Magazine • October, 1984 27
Joseph I Can K41PV S440 So. 8th Road Arlmgton VA 22204
1^ for Ailing Antennas
Maximize your system's performance with this easy-to-construct noise bridge. It's just what the doctor ordered.
The antenna noise bridge is an instrument which most amateur-radio enthusi- asts have seen advertised but only a few know how to use Several different mod- els are offered by Palomar, Omega-T, and MFJ (see photos). When used with a receiver (preferably a gener- al-coverage shortwave re- ceiver), the noise bridge makes it easy to "wring out" antennas, transmission lines, and other tuned circuits.
The heart of any bridge, perhaps, is the signal source. In the noise bridge, the sig- nal source is a noise gener- ator such as shown in Fig, 1 . The actual noise source is the zener diode connected to the base of transistor Q1. A zener diode operating in
the avalanche mode pro- duces large amounts of semi-white noise. If you con- nect it to an audio-amplifier input, then the output is per- ceived as hiss. Some people call this circuit a Gaussian noise source, but that desig- nation is a little off the mark. True Gaussian noise con- tains all phases and ampli- tudes of all frequencies. The noise produced by the cir- cuit in Fig. 1 is bandwidth lim- ited to less than 300 MHz, or so. If Q1 through Q3 are se- lected with care, this genera- tor produces results through- out the HP spectrum and in the VHP spectrum at least to 2 meters.
The stages following the noise-generating diode form a wideband amplifier. If the
transistors are selected for UHF frequency characteris- tics, then the frequency re- sponse will be well into the VHF range. Good selections from the replacement lines are ECC-107 and ECG-108 or their equivalents.
Fig. 2 shows the actual bridge circuit. The block marked ''noise-generator cir- cuit" is a circuit such as in Fig, 1.
The heart of the noise bridge is transformer T1. There are three windings on the toroidal core of T1, and these windings are trifilar- wound. A toroidal core ca- pable of 1- through 150-MHz operation, about 3/4 to 1 inch in diameter, should be sufficient. The wire is #28, either enameled or with the sort of synthetic materfal that covers wire used in wire-wrap systems. Ten to 1 5 turns are appropriate.
OliiF
i»m
€ an
C*
Coficeptually, this bridge is similar to the simple
Wheatstone bridge. Recall that that bridge contains four arms (each a resistor) formed into a diamond- shaped circuit. Excitation is applied between two of the resistor junctions while out- put signal is taken from the other junctions. In the noise bridge, coils LI and L2 form two of the arms, the antenna impedance forms the third arm, and impedance R1/C2 forms the fourth arm. Excita- tion is through coil L3. Since 11 /L2 are trifilar-wound, these two coils form iden- tical impedances. Thus, the bridge will be in balance when the antenna imped- ance matches R1/C2.
Capacitor CI has a value half that of C2. Thus, C2 will have to be exactly in the middle of its range to bal- ance (i.e., null) the circuit. The purpose of this scheme
r — V*» #
T77
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Noise bridge from Omega-T. 73 Magazine • Octobef, 1984
fig. h Noise generator as the signal source.
Palomar Engineers^ noise bridge.
MFl ri noise bridga
is to allow measurement of inductive reactance compo- nents of antenna impedance as well as capacitive. Exact- ly at resonance, the antenna impedance reactances are equal (Xl = X^2X so they cancel each other In that case, the value of C2 equals CI, If the antenna is capaci- tive (X^- greater than X^^), then the null is found on C2 at a capacitance fess than O. If, on the other hand the antenna is inductive (X^ less than X^i then the null will be found when C2 is greater than CI ,
Null occurs when the im- pedance of R1/C2 is equal to the antenna impedance (tak~ ing into consideration CI). This null is indicated by a sudden decrease in the noise level coming from the receiver (or by a dip on the receiver S-meter). This re- sponse is shown in Frg 3. There is usually a fot of in- teraction between Rl and C2, so these controls must be adjusted several times to find true null.
The null indicator is a re- ceiver The best type of re- ceiver is a general-coverage shortwave receiver with an envelope [i.e., AM) detector and, preferably, an S-meter. Ham-band-only receivers re- quire the null be inside the ham bands (often not the case!). I have found it dif- ficult to use the bridge with SSB/CW modes. Tune very slowly white searching for
the null- Perhaps the most common mistake made when using a noise bridge is tuning the receiver too fast The null tends to be sharp, and is easily missed if tuning rate is high.
Finding Antenna Length
The arithmetic equations which we use to find anten- na lengths are ''ball park'' only, except in someplace called "free space" The real physical length will be lon- ger or shorter than the cal- culated length. Part of the job in setting up an antenna is cutting (or lengthening) to size. In the usual scenario, one takes a vswr bridge and measures the swr at several points within the band in order to find where the mini- ma is located From that in- formation we can tell wheth- er to lengthen or shorten the antenna.
The noise bridge gives us another method. We con- nect the general-coverage receiver via a short length of coax to the RCVR port of the noise bridge, and the anten- na coax to the ANTENNA port of the noise bridge. Set the X control on the bridge to mid-range (i.e., C2 at half* scale) and the R control to some value between 5 and 20 Ohms (will be readjusted later). The receiver is tuned to the antenna design fre- quency. The procedure is as follows:
I.Vary X for a null; this
null will be broad, so listen
carefully and tune slowly.
2. Observe whether the X nulls are on the Xl or X^ side of zero. If the null is on the Xj^ side, then the antenna is too long and the actual reso- nant is below the design res- onant frequency. If the null is on the X^ side of zero, then the antenna is too short and its actual resonant fre- quency is above the design resonant frequency.
3. Retum the X control to zero.
4. Tune the receiver slow- ly in the direction indicated by the result of step 2.
5- Look for a null as you tune the receiver When you find the apparent null ad- just R, X, and the receiver for deepest null (except interac- tion). This deepest null is the resonant frequency of the antenna,
6. Adjust the length of the antenna as indicated by the null: (a) if Fr is above the de- sign frequency, then length- en the antenna, or (b) if f^ is below the design frequency, shorten the antenna. Occa- sionally Fg will be so close
HDfS£ SEHEWaTOW
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to the design frequency that no action is needed.
The noise bridge is espe- cially useful where the reso- nant frequency is out of the amateur bands. It also is useful inside the band, but so is a vswr bridge. We can- not however, excite an an- tenna outside the band!
Half^^ave Transirassion lines
It is frequently the case that we must excite anten- nas through transmission tines which are integer mul- tiples of half-wavelength. Antenna impedance mea- surements, vswr or iswr, and similar measurements must be made either at the anten- na terminals or through matching transmission lines which are integer multiples of half-wavelength. The rea- son for this is that the im- pedance is at the load and is repeated every half-wave- length down the line. Thus, if we measure the imped- ance (or vswr/iswr) through 0-5, 1.0, or 1 .5 wavelength of coax, it is equivalent to mak- ing the measurement at the load (antenna) end.
^' §) AhfTC(t«tVA
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Fig. 2. Actual bridge circuit
73 Magazine • October, 1984 29
So how do we find half- wavelength? Some people might tell us that the length in feet is ^^2IF^^^, but that equation does not account for velocity factor. Since the wave velocity in the cable is a fraction {0 to 1) of the ve- locity in space, we must use the vefocfty factor (V) to reduce the physical length The corrected length is found in Equation 1:
Lft=492V/F„Hz We normally use figures for V that are glibly quoted in spec sheets and antenna books (e.g., 0.66 for "regulaK' coax, 0.70 for Tefion^^ di- electric, and 080 for foam dielectric), Bui when we actual IV measure velocity factor, we find these figures often are incorrect by as much as 25 percent— a fac- tor that seriously affects Equation 1 !
Fortunately, we can use the noise bridge to find half- wavelength; Fig. 4 shows how. If the coax is shorted at a point exactly one half- wavelength from the drive end, then there wilt be a sharp null in the noise at that frequency.
Normally, we would start with a physical length 10 percent or so longer than es- timated from the equation length. We then begin short- ening the coax, reestablish- ing the short circuit each time, until the null moves to the correct frequency. This method involves the sacri- fice of a small amount of coax but yields a length that has an electrical length of exactly one half wave at the desired frequency. Some peo-
F||EQ4»te«CT
pie use heavy pins or wire nails pulsed through the coax insulation to achieve the short circuit
An alternative to the short method, as well as a check on the valtdity of the short method, is to use a 50-200- Ohm carbon-composition (or other non inductive) resistor in place of the short. The R dial on the noise bridge should read the same as the resistor value at half -wave- length.
Finding Coax Velocity Factor
The published velocity factor for coaxial cable is frequently in error. If we rely on this standard wisdom it is likely that we will at one time or another get into trouble. But it also is true that the velocity factor of any given lot of coax will have a uniform velocity fac- tor even though it differs from the standard. Thus, if we buy a roll of cable (500 or 1000 ft, for example) and measure the actual velocity factor, then we can depend on that figure for the entire roll. From Equation 1 we know that velocity factor V is found in Equation 2:
V = LFN/492 where V is the velocity fac- tor (0 to 1), L is the cable length in feet, F is the fre- quency in megahertz, and N is an integer (1. 2. 3, . .etc.).
We can use our noise bridge to find V if we know L and can determine F on the receiver dial. A setup such as Fig. 4 is used. Measure a convenient length of coaxial cable (around 40' will yield good results). Know (by measurement) the exact length of the cable to within an inch or two. If we assume a value for V of about OJ, then we can calculate an ap- proximate value for F at which N=1 (simplifies
BtCEIVEf!
things). For example, for N=l, V=:0.7, and 1^40 ft, F will be approximately 8.6 MHz. We can start search- ing for the null at that fre- quency. The test procedure is as follows;
I.Set X at zero and R at just a little above zero.
2. Short the load end of the coax.
3, Adjust the receiver above and below the design frequency until a deep null is found. Record the fre- quency at which this null is found,
4- Using the premeasured length and the frequency found in step 3, calculate the velocity factor V using Equation 2
You can repeat this ex- periment at different values of length (L) and average the results to find the "best" value of V, Once a value is determined, it can be used safely for the entire rolL You will be surprised how far re- moved the values actually measured are from the stan^ dard published values!
Measuring Antenna Impedance
Measuring antenna im- pedance with a noise bridge is very similar to the method used for finding the correct antenna length. We are as- suming that the antenna is properly cut and the null is found at the correct fre- quency. Despite the fact that the null is on the cor- rect frequency, it does not mean that the impedance is correct. Of course, incorrect impedance means a vswr problem
To measure antenna im- pedance, we should connect the antenna to the noise bridge through a piece of coaxial cable that is electri- cally one half-wavelength That way, the antenna im- pedance will be reflected to
Fig, 3. Response when there is a sudden decrease in the noise level conning from the receiver.
30 73 Magazine • October, 1984
i"
f qg. 4. Using the noise brid^ to find half-wave!engtk
the input end of the trans- mission line where the bridge is connected. The deepest null will occur when the R control is set to the ra- diation resistance of the an- tenna Again we are as- suming that null occurs at the correct frequency. If the antenna is truly resonant* then the X control will be at zero (indicating that X^ — X^) Once the impedance is known, we can determine whether or not any match- ing strategies are needed
Other Circuits
The noise bridge can be
used to measure the input impedance of any tuned res- onant circuit provided that the impedance is within the range of the bridge. One would not want to use the bridge on any device that is supplying power, but on passive circuits it should work nicely.
Untuned amplifiers and networks can also be tested with white noise. In those tests, one would not use the bridge portion of the instru- ment; only the noise-gener- ator section is used. The cir- cuit of Fig. 2 must be fitted with a BNC or 50-239 out- put connector that brings the noise signal to the out- side world.
One unusual application for noise generators is in testing of signal-averaging instruments used in commu- nications laboratories (as well as in physiology/neurol- ogy). In those applications, the noise signal and a low- amplitude sine wave are mixed in a linear summation network before being ap- plied to the averager If the instrument is working prop- erly, then the noise will aver- age to near zero while the periodic sine wave is en- hanced.
The R-X noise bridge is a lovv<:ost instnjment yet it can provide amazing results. Few items of amateur test equip- ment work as well or are as useful as this unfortunately neglected instrument ■
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Ryan's Vertical Ecstasy
Warning: Graphic depiction of vertical antenna array patterns. Explicit CoCo language. May incite construction frenzy.
Well now, this program is ideal for those de- siring to experiment with designing quarter-wave ver- tical antenna arrays (multi- element). Formerly, unless you had the facilities of an antenna-testing laboratory available or some rather ex- tensive equipment on hand, you had to go the old build 'n' try method.
With this program (and your trusty CoCo — see be- low), you can design multi- element quarter-wave verti- cal arrays in the comfort of your shack and construct only the final selected re- sult It allows you to insert
up to ten elements in any layout with either -h or — phasing, with any power level to any element (all refer- enced to a reference ele- ment], see the result dis- played on a simplified Smith chart, and then call up the front-to-back ratio and gain data for the array.
This is not completely original. The original version of this program was pub- lished in the May, 1980, issue of 73, in an article by Dennis Mitchell K8UR. !t was written for the TRS-80 Model I and, to use it with the TRS-80[C)-CoCo-l found that I had to exten-
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DIST[5|NCE IN FEET ^^tHEEU ELEMENTS- 1 i 2 ftT t4»23 ftHI. IB
D19TAMCE m FCer FOR PHfliSE ANGLE DF 9*:^ tS Ifr»-^2 FT,
DISTANCE fN FE:et &etltHtEN ELEMENTE 1 '.; I! AT 7. ;?4 riHZ. 15
DISTANCE m FEHT FCK PHASE ANGLE DF 9c> IS t2*^t FT.
16.4^ FT.
52 FT.
Fig, 1. Typical printout of Iwchelement quarter-wave vertical array.
32 73 Magazine • October, 1984
sively revise and modify It Eventually, I wound up re- doing the graphics com- pletely in order to take ad- vantage of the CoCo's hi-res- olution capabilities. Along the way, several features were added, like output-to- printer and distance-mea- syrement capabilities (for converting degrees of wave- length to feet for any given frequency).
The program, as written, requires the full 32 K Ex- tended Basic version of the TRS-80(C) that^s apparently in use by many hams today. However, by removing the printer option, the rather long program-operating in- structions (roughly tines 960 through 1120), and several other lines (see the REM statements), you could squeeze this into a 16K Ex- tended Basic CoCo and still have the graphic output as well as the generated data.
Program Restrictions and Capabilities
Now first of ail, this is for quarter-wave vertical ele- ments only, No multijDand verticals count, as this pro- gram calculates for distance between elements and length of feed line between ele- ments, which, obviously, change with frequency changes. However, if you're willing to build the result keeping in mind that you'd have to move the elements and lengthen (or shorten) the inter-element feedlines, 1 suppose they could be used. To be sensible, just plan on
using straight quarter-wave elements (made out of TV- mast tubing and mounted on a soda bottle, if neces- sary).
Note that this program will calculate and display only the array's horizontal- angle radiation pattern. The vertical-angle radiation pat- tern is determined by your local effective ground {see references) and no provision has been made herein for that for two reasons: It prob- ably would drastically increase the size of the pro- gram, and your effective- ground value changes daily (again, see the referenced ar- ticle on ground effects).
This program will, how- ever, calculate and display the array radiation pattern (horizontal), the F/B ratio, dB of gain, etc., for any arrange- ment of elements, spacing, and phasing.
Program Operation
A little about the program operation. Briefly, the vari- ous inputs requested are:
1. Number of elements: Anywhere from two to ten (this can be increased by changing the value 10 in line 80).
2. Input relative phase: In degrees from 0 to 360 (+ for leading arid — for lagging). 360 degrees represents one wavelength, obviously. Two wavelengths would be 720,
3. Input angle of ei: The direction, in degrees, from the reference element (0 to 360).
4. Rel. amplitude of eL: The power, in Watts, going to the element in question. (If equal to that going to the reference element from the transmitter, then the answer is 1; if less, because you're inserting an rf attenuator in the line, then a decimal valuej
5. Input spacing of et.: This is the distance from the reference element in de- grees (i.e., 90 = Va wave}, to the element in question.
Finally, at each element step you're asked if the data you have input is correct. If not, you can answer with an N and enter the data for that element again. If your answer to the final element input is Y, then the program will go into the calculate mode.
While calculating, the program will go into the graphics mode and show the simplified Smith chart, dis- playing the elements as you have called for them to be assembled into an array. The view is ''bird's-eye" (see the printout example. Fig. 1). Be pat/ent— Basic takes time, and a full array of 10 ele- ments could take 10-12 minutes to calculate.
Of course, you can insert the old ''Vitamin E" poke — POKE 65495,0 -at the be- ginning of the program listing, but I left it out because I run this program from disk, and without mak- ing internal modifications to the CoCo, the disk controller doesn't like this speed-up poke. If you're not running this with a disk system, you probably could use this poke, but, be sure to also in- sert the slow-down poke (POKE 65494,0) prior to any line calling for a printer out- put (if you use the printer option]. This would speed up the calculating time by a factor of approximately 2, but for smaller numbers of elements it really isn't nec- essary.
When the calculations are complete, the screen will erase and then replay the Smith chart with the
elements displayed and begin plotting the radiation pattern, one degree at a time, before your eyes (sound included). When finished, follow the prompt and hit ENTER for the display of power-gain and F/B ratio figures. Follow the prompt to display the menu of optional features.
The menu has eight choices. Item one will re-dis- play the Smith-chart plot Items two and three will display the power gain and gain in dB either every two degrees or (in item three) ev- ery 30 degrees. The latter is best for one screen display.
item four is for a restart to calculate a new array. Item five will re-display only the Smith chart with the ele- ment placement, but no plot Item six goes to a subroutine for calculating the actual physical distances between elements and the physical lengths of the feedlines be- tween elements for a given frequency. This same sub- routine is offered as part of item eight, which is the printout selection. Item seven simply re-displays the original display showing your input values for the original calculation. Item eight, should you elect to include it needs several comments.
Printout Routine
Some of you may not elect to include this feature as its main purpose is to create a file of plotted antenna arrays in notebook or loose-leaf form. The sam- ple printouts included here- in (Figs. 1 and 2) show the results of the printout rou- tine itself. If you choose to incorporate this system, you'll be prompted, after the majority of the data is printed out for the distance calculations. The printout routine allows as many as you desire for as many fre- quencies as you want Just remember that for a given array design, the pattern will not vary because of fre- quency because the calcula- tions do not require frequen-
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Fig. 2. Printout of a four-element quarter-wave vertical array showing add pattern.
cy as an input. The whole program assumes that you know how to calculate the length of a quarter-wave an- tenna. This distance calcula- tion is a final touch, and allows the calculation of oddball inter-element and feedline lengths.
In order to use the print- out routine, some hardware consideration must be taken. This program, as listed here- in, is designed to work with a Star Gemini 10 (or lOX) dot- matrix printer. The screen- dump routine, which is not part of this program, is a commercial software prod- uct (probably sold by sever- al companies). You may have written your own for this or have a different brand of printer (i.e., Epson, Okidata, Radio Shack, etc.), Ef so, the DEFUSR and USRO calls in line 1390 will most certainly be different. Use your own.
if you are using a Radio Shack LP-VII/DMP-100 print- er, you can use their
SCRNPRT program, but in- sert the correct CHR$() figures for expanded print etc. (see the REM state- ments in the listing). In all cases, load and execute the screen-dump program prior to loading and running this one. All of this, of course, only if you plan to use the printer output
Terminology Definitions
Wavelength: !n this case, the distance in degrees [0 to 360, as in a circle) from the beginning of a wave to the end. All measurements in this program are converted into feet and inches already. If you are planning a rather gigantic array with element separations greater that one wavelength, then simply add the degrees on [i,e,, 1 Va wavelengths = 540 degrees). The distance-calculation op- tion allows the calculation of the linear distance be^ tween elements, etc.
Angle of elennent: In this case, the location of the ele- ment in question with refer-
73 Magazine • October. 19S4 33
Input Listing
10 CL5
20 GDBUB 9hC
ZO CLEftR :3O0
40 DIM &N<3^0J •Gn(3^0}|AA-ttBB^
t BD« , O t 7 4 533 1 C V -56 1 CH*4S SO VI-l03BiZL«lOiF«'''llill,HM''iFl«
G*t32,- -lli*"LEFT»(&L»,7J 70 PR1WT«5Z4*" INPUT MO, OF BJEH.
<nAX. 10>"3 £ INPUT MI BQ IF NI*0 OR Mt>lO TH^N 70 7Q CU»tNI*3)l32i GOSU&740 lOQ FOR r**2 TO NI 110 PRINTICU. ^INP.REL^PMASI OF E
120 II4PUT AiNViGOSUB 7e0tFt%tNT#i Pt^llt32+7»A(N»f
130 pfiiMTicu, -rrtfin awste of ele
140 If#\lTD(M}t<HlSUP 790lPfltf«T«(«
+llt32*i4,0lH> ( ISO Pfl:lNT«CU, --^ REL-AI^L.OF ELEH
EWT« " i N ; IbO INPUT KtNMGOSUB 7eOiPRlKT*f
|tH-l)«32+2ltK(N> t
170 pftiMTicy^-iMKiT ^^^ttm of E
IBO i*«»UT »*HMGOSUB 7O0jP*tlNT#<
190 PRlftrT«CU,-''M INPUT- DATA COR
RECT'^'iV OR N'-'iAN* 21X» IF WI*-""THEN NEXT N 210 IF L£Ft»lA«»* 1I--V" TH^W ICl
T N ELSE 110 220 l^09U9 7eOl6O3U»900 230 lff«0
2«0 FOR J-0 TO i&WSTEP 2 250 FOR *i»2 TO NI
270 MO^GO£<Ct •*!IN>'i+«tVT»'SIN(C>* VT
aeo 6M(j]f^saRfiAA*H0) eB*(vT'B»}
t 3*?0 IFGNfJlvZH THEN 2ri-t5«{ Jl iPI -
J
;nO NEXT N 320 VT*0!H0=O 330 NEXT J
:54o iFFi «ieoTHENP3«pi-i©i;ieLsep^
350 •
ZhO ED5UB1150 370 GOSUBli*?ii 3e0 G03UB900
390 LiNe(i2a,i5J-(i2e, weuPSET
400 LINE!r.a*9AJ-<:S2'?i?aJ ,PBET
410 FOR n-O tQ 3liO STEF' 2 420 GOIJMD 140.1
4S0 IF Fl-O THEN 6ri<N^HGN(n)
440 GNtM)^^4&/ZM»*GNtM)
450 X^C0Sif1»RD>ieN(»lJi2,StlFK''-l
29 THENX— i2ejtFK>l29 THEMX
«128 4i,0 y=giNm*FfDJ*QNilli*n. i-X'! f FY^ -
9h THENY*"96i IF¥j94 THENV*9
470 PSET 1 1 26+ X , 94-*-Y. 3 ?
4ei:i NEXTH
4^0 DRAW "em 2. I5:riU"NU3R4NU3D3BM *T-,0"i DRAW"EH*H9, i52tRlNRtUt NLlRlBn*4. ♦6'>iDP(AW"&M:!fc* %%Z t U6f4L2R2&n*3, ^it"
50t> DRAM" BP11 :\ I &? i NR4U"MR2U"R4&T1
f 2UlF 1 WJ^PM*3, 0** I DPAW"Brt2B, 1 12 1 Ufcr '«♦ ^ t * fe ^ I Df^ AW " &f1
"2* I62triK'iaJHR2UTR4eN*T, *&•' 1 ORA«4'*Ein40. 162iU£iF-:F 1IiIG1L2 Nl.lF7P1+5*0'*
510 0RAW"6H12. J 7riU3WR2U:iR4PM* j, *t.^jORAM-BNl«. |72*HIU4£lR2F 1 t>4&J L 2|tri * b , 0 " I Df' AU" Btt2fe » I ^ 2i U&R3F 10 i & 1L2NL 1 F T fett* ; , V"
520 |tRAN'-fini2. lS23HlU4El^::FiBn+0 **2HL i&2filL2f>n+6« "- i Dl^AW'in 19, ie2:ll4E2FrDrNL40ri?«-3*'.«- r[>RAU'*B!li;:^« tB2iRiMRlU6r4,rRl
Bn*«.*h*iDfiim''Bn'2, ie2iiJ6PI Oir2IHPlNU&©f»* .
2ML402fi»1*3„0- * tHiAM-em^. IB2 lUANL2f-rh *A-!PRAl^. 4,
l82£LHIE2F.^.:H^4D2Bn^^»
540 IF INKEV*^""B0TDS40 ELSE GOT
055'J 530 CLS:OB=lO*<LDGfZMj/LaG(10Ul
F&=tO* (LOG f GM fPl ! /Gff rP7i> > /L
560 IF Fi=0 THEN IK^DB
570 PRINTSIO. "NO. ELEMENT' St " j NI ?^f'RmT'&42, "GAlNs "fipRINTU SrWGFtiDC: J PRINT" EJB^* 1 1 PR INT etB, "F/& RATIO; ■'; :Pf>iNT(Se^. U£lNGF*iFE; sFfilNT^O&^i
SBO PftlNTsPRIMT
5^0 Fi=l
6O0 PRlMT&4aO, "HIT ANY KtY FOR D PTIDMB LIST";
&10 TF i(»:ey»»""then goto &10
620 CLSiPRi:NTJi7^"nENU OF OPTIONS "I iPRINT«32,HY*t;PRINT'#64* • 1> PI.GT PATTEFt*": sFfflNT^fc* •Z> SAIM evERr 30 DEQR^EES*! ;PRINTei2S, ■'T> 6fllN E^ERV 2 0£SftE£S"s?PR||fT«l«?2, -4t NE m START-;jl^lWTia224*"Sl ELE MENT PLACenENT"isPRl!tfTe256, -6> DISTANCE CALCULATrOf^S"
b30 PRINT§!2aS. -7^ EUEMENT BATA*i PRIMTS3S2, ~Q1 OUTPUT TO Ri^I NTER OF CHAfiT * SAIN IWT
A, ETC,"='DEJ_Et£ Ff:|NTi§352 STflTEMBfT IF NQ PRIMTEfl Ctf^t ION
t40 )t=OtY=Ol I1«=tJT**^ELECTiaN-iLLl |FLL.= 1 intNZrt=*6ELSE TFLL*3
n^M j=2 650 ON Lj_ &nTa 3ao.«^Qo«700«aoo.s
lO, l20Ot&7C* fcfaO T-ItGOSUBi;:^>:'DEL£?rE IP NO PRINTES OPT ION USED
680 CLSsPRlNTTA&l4l "EVWOPSIS DF GAIN OfiTft* :PRIKTHV*E
690 J=-i>sP£H|>E&R€E STEP
700 PRINT -I>EGRiEE'-:TABTS>t 'PUR. GA IN- ; TAB 1 20 J ; "HB i I > GAI N"'
710 FORI=OTni*0 STEP J
720 PftlNTTA&«2J J lETfiBCei stPT^lrfTU SIhlQF«:&M{n£: tFGri't) ^?tHE WP«I NIT^AB < 2 1 > I ; Ff? 1 NTU5 1 M&F ♦ 3 I0»*LOBCGm:in /LDSMOi "
730 NEIT I
740 Gcrroi»o0
750 END
760 CLSj PR I NTH V * i s PR 1 hTT "EL * t " t T A
Bii>fi "PHASE " ! TAB < J 3> S " AN&LE
" I TAB i;20> t " AMF-L. " : TA» 1 26 M *
SPACE *" i FI^INTHV* ; 7TO FOR I =2T0N l ; PR [ NT I ; TAB t b > a A i
I>;TAS<14>:OUJ ;Tftii<2C»J (KU
) jTAB<27)|BCI) *MEXT:PfiJNTMV
t 7^0 PR I NTftCU , &L* ! J RE TURN 790 FOR tM::U TO S6«?STEP6atPPTNTii
I,0L»| ;NE"^T: RETURN aXt CLBiCLEAfti RUtMO 0 10 F M0DE4, 1 : PCLS: SCREENl , I : FOR
F-L=2 TO igi + l:TF BtF'LJ^Ee TH
EMBG^BtPL) jNEXT
820 QOSUBtlSO
530 B0SUB1190
B4CI FOft RL=2 TO Nil XX-CDS 50 (RLJ t RDl
BSD XX"XX*BfRL> /BIS*2S + l2e
B60 VY=5lMiO<RL> tRDJ l&fRLf ^B&HB *76!PSET\Xi{, vy,T) iPSETiXX + l , y V+ U 3 ) ; PSET ( XX-- 1 , V ¥-- U ^ ' S PSET<XK+l, yv-t ,3^ ! PSET f XX-1
,yv+u3i
©70 NEKt RL
SaO FDR V-JTa20:PSETU2S.96.3) tP SET (129.97.^3]^ iFsnUZ/, 94* 7 » : PSET < 1 2^ . *?4^ 3M P^er U 27* 9 6^3* i NEXT; FOR VW^l TD20f f^ES ET ( 129, 97 ^ i PRESET { 127 . 94 > t P RESET < 129 , 14 ) i PRESE T f 1 27. 94 > tN£XTiS0TDB9O
S90 eGTD49[:'
900^ FDR PL = 2TDNl+ls IF BCF-L>^BG T HEN &B=B<PL1 sNEXT
910 PMDDE4, 1 5 FilLSs SCREENl. 1
920 BOSUBllST'
930 &0SUB119O
940 FOR RL=2T0Nl;)[X=f:O5*0<RL) iRD i E XJe=^XXtBtftL» /B&l2B4'12a£ yY== SINCD{RL> fRDi t&{Rl^> /BGllB*? 6sC=3rPSET<XX, Vy,3>:F-^rt;«^ + l,yVi-l,3> iPS£TlXJ£-l*V¥-1.5 I :PSETCKX+l,VY-l,5l|PSETC5<I ^1^VV + 1*3» tPSeT(13B,'?6,3>jN EXT
95*5 RETURN
960 CLSjF**ircnXR*t23J tPRINTft74,'^ VeSrT-iiFOPI": "I .1 7:NE3fT;PPt NTil74 , B» ; F^ t N f ^ . !3 , 'PLOT - 1 PD
ft|«lT01S0t NEXTtPRINT:S7fc,B< iPRlNril74, "VEiRT'^i tFDRr = tT01 SOi NEXTi PRINTft?©, "^PLOT" | i PR I NTdSS f.'^'tt FDR J = I TDB e PR I NT tFDRl-|TCHOOtN€KTi NEXT t SOTO 970
970 PRINT* 6S. "POLAR PLOTTINe PR OI|RflM^^iPRINT«l02» '*FQR DRIVE H ARfift¥S^'iSOT09eO
9ao PRINT* 163^*- 1 979 - D,C*MITCHE LL - KeUR"5lPI*TNT»229,"AS M OOJRieD FOft USE ON^'StPRINTt 260i"A TRS-BO 'COLOR CGtIPUT ER* - t i PRrNTt334 * *-By- - 1 1 PSt NT<»367* "19B»- J -A- Bifm - MBW.iW "nFORt^^irOSOOOtNEXI I CLSi PRlNTCMft* (2QJ
990 PRINT' THIS PROGRAM LETS TM E USER DEBII^N H|5 OWN PHASE D ANTENNA AfWAYB UP TO tO E LEHENTS, nORE ELEMENTS HAV IC USED 8V CHAN6lf« T>IE ' 1<> ' IN LINE ^90 TO TH£ BESIRE & NunBER OF ELEKENTS,-
tooo print-notej pujttins Tlr«: I
e ABOUT 1,5 MINUTES'^
tOlO PRlPtT-FOR 2 ELErewTS ^ ABOO T 45 SEC. U3P»ieER PER"
1020 Pf* I NT "EACH ABDltJCNAL CLE« NT.-
1030 P«INT«44B*''H1T ENTER TO CDN TlMJE'tt |»«^ruiiAECLS
1040 Pnim" fO &ESl&Pi an ARItAY. PLACE THE eL£*€NTS OUT AS XSlflEQ US1N& A 'BIRDS E¥E' Vl€M OF THE ««ftAY AfsID AN $ *V COOftOlNATE SySTEW WITH O -OEGAEES AT THE filGHT, 270 AT TOP, leo AT LEFT AND 90 DEGREES AT TmE BOTTOH. -
tOSO PRIIfT "IVe. PROEBAI1 WILL ASK VtU PHASE* AN&LE, AflPLlTUD E AfrfB SFACIMG. PHASE tSf-i FOR LA3G1NB AND **} FOR LEA D1N& PHASE. F-HASE IS IN DE& REES Ffitm THE FEFERENCE ELE HENT. choose OfC ELEMENT 0 F rm ARPav AS A REFERENCE.
1060 PRJNft44fi*-M|T ENTE*^ TD CON TINUE"Ji tNPUTUU*;CLS
1070 PI* I NT- <ALL MEftSUREnENTS FO ^ THE OTHER ELEMENTS WILL B i TAKEN FROn THE REFERENCE ELEMENT CHOSEN >. AN¥ ELErC NT WILL DO, THE ANGLE IS T HE AM&LE BETWEEN THE (OjDEG fVEE HEADING OF YOU K-Y COOR OINATE,'^
1080 PR I NT ^^ THE REFERENCE ELEtlEN
T WHICH IS ALWAYS AT THE CE
NTER OF THE X-V COORDINATE,
AND THE ELEHENT IN QUEST 10
N-"
109y PRINTl*44a.^'HIT ENTER TO CON T1NUE"m INPUTUUtiCLfi
nOO PRINT" THE AMPLITUDE IS T HE AMOUNT DF POWER WHICH TH E ELEMENT IN QUESTION RECE I VES COMPARED TO yOOR REFERE' NCE. IT IE EKPf^ESSED AB A RATIO* THE REFERCTCe EUEmf NT ALWAVS G^TS Is] POWER SO
If "^ 1110 PRINT'" ELEMENT 2 WERE TO GE T TWICE ftS MUCH POWER, YOUR INPUT WaULD PE ^2) FOR AMP LITUDE, THE SPACINE IS HOW FAR THE ELEMENT IN QUESTION IS PROt^ THE REFERENCE EN U ESREES," 1120 PRlNTi|44e. "HIT ENTER TO CON
TINUE ■ t s INPUTUUttCLS 1130 BaT03'> 1140 ^ DON'T REMOVE LINES 1150 TO
U50 DRAW"Bf1l20t t2tNR4UlElRlE2Ut HlL2GtBM-7.+3''sDRAW 'BM129. I 2tUlE4UIL4BM*7» +6" 1 CHRftW'BMl 38, l2|HlU4ElR2FlD4&IL2Btl*fa,
I160 DflAW^Brf242*^6iHlU4£lRS^tD4G IL2BH*6»0-|0RAW"&H122, leSjF 1 R2E t U4H I L2l5 i U 1 F tR2ef1*4 . +3 ■ iDRflW"BMl3*>» ia6tH|U4ElR2FlD 4BlL2BH+6,0'*
1170 DRAW-eh6»96ERlNfilU6GlBH^6,+ S-tDRA*)-&Ml2.96tNlillElH3UlE I R2F ID 1& I F4L2P 1 Dlf^ 1 LJZBn«6^0~ 1 DR AW ■* PH20 , 96 f H I U4E I R2F 1 04S lL2©n*6»0"
tiSO RETURN
1190 CIRCLE U2e, 96 »,10O,,, 925s CI
RCLE(l2e,96K3, . I: RETURN
12O0 CLSfFRINTe2H, "DISTANCE BETME EN ELEMENTS AND PHASING CAL CQLATIONS*' s PR INTiPRINTe PF :N T'FREQ. IN MHZ- (TQ NEAREST . OO J "
121 ^h INPUTR
121S FOR 1=2 TD MI
1220 X X=934/Re YY-KX /360i tfkiU «¥ Y *An>si:Ba}=¥¥*Btn
I22S PRINT"DIST. IN FT. BETWEEN ELEMENTS"! f PR I NT *■ 1 if^'jljiP PINT "AT "sRtsPRlNT-'riHJ, TS ";;PR|NTuSlNlSX»|IBa*lJpRTN T-FT"lNEXT|
T230 FC^ 1=2 TO NI
1240 itx=936miYy-xx/360i lAf n*yY tA c n 1 ZB I n >y y «B u >
1250 NEXT!
1260 PfilKTrPRINT
1270 '
l2eO IF T=l THEN BOTO 1340 ELSE
60tO 1290 1290 FOft 1^2 TO Nil PRINT "Of ST. IN FT_ rOR A PHASE AN&lE 0
F-s 3 PeilCT* At 1 » f-t 1 1 « PRINT-
IS'tsPRlMTuSlPiGXti *2A'f 't-1
\ I5PRIWT-FT* "tNEKTl 1300 FRIKTiPfilNr 1310 IWPUT^DO you l*ANT ANOTHER D
ISTANCE CALCULATION ♦.
y^YES. N=N0i'3C*
1320 IF c»^-¥- mmt sorro 1200
1325 IF €»*>*'¥'' AMB t' I TtCN ^O TD620
t330 IF C»*. *-¥* TMEl^ PR1NT#-2*CH R**l2JEGOTtI 620
1340 CL£iPRINTet30»*'PR|NTmjT OF DISTANCE CALCULATlGWaPRINT • -2," -sFOP 1«2 TD Nlif¥rlNT •-2.*Dl5TftHCE IH FEEl BETWE EH EL-EMENTS''5sPf?tNTi-2,- 1 i(-Sl;iPPlNTi-2.*AT ^iiPftlHT •-2*USINBlftsPa = PRlNT|i-2,*' n HZ. IE "i !PRINTi-2*Lie.lNGX»t ZBa>isPRlNT<-2.- FT^-iNEXT
1350 PRINT»-2sFQR 1=2 TO Nli(ir-9 36/ Rt y¥=irif . T*ji,; 7Z < t * «Y¥iA * 1 J
1360 f^lWT«-2* *Di STANCE IN FEET FOR PHASE ANGLE Of ' ttPPlNf »-2, (A<lJt-n!:PRINT*-2*' I S "tsPRINTil'2.U5lNG5(*j IZACI t»-l>S5pRTNT»-2*- FT."
1370 NEKTIfSGTOl3l'>
! 3Q0 CLS ; PR I NT^ 132," SEND I Na TO P RINTER"i&0£UB 140utREM FRTW TER ROUTINE FROM HERE TO IS
(My
1 390 POKE 1 SO . 1 J DEFUSR I =«.H7E0<>t Y » USRKOl jCLSiB0TOJ4i0
1 400 POKE 1 50 , 1 1 PR I NT«"3, i " " i F1^ 1 NT#-Z:.TAB(10) I "NQ. OFELEME NTS= '':N1::PPINT«-2.TAB(64? ;^'GATN= ■';;PRTNTK''2*USlNaFi |DCjtPKINT«-2., I'DB* ^'iPRlNTtt- 2.TAB«59) p ^'F/B RATIO'S "iE*^R 1NT4I-2. USIN5F*f FB? a PR] NTit-2 , "D/B'^StPRINTff-2^" ^'iRLTURN
1410 CLSiPRINTil32, "PRINTOUT OF GAIN DATA" 3 PR I NT »"3," t>BpRI NTtt-2, *' '■
1 420 FRlNTtt-2. CHfl* (1 4 H TAS ( 1 0) i '* SYNOPSIS DF GAIN DATA"! PR IN T«-2,KYt
1 430 PR I NT# -2 , CNR* f 20U I PP I NT 4-2
. TAB f 101 r "DEGREE^'; ;PRrtJTi-2
, rfi&*3aj s 'POWER GAlN-'|iPRIN
T4-2,TAB(4!e.)i"DBa5 &AlN*«tP
RINT*t-2.Ky«3pRINT4-2, " "
1440 JEi30iFOR 1^0 TO 360 STEP J
14&J PRINT#-2, TAB ( 10> t I ; TABC39> 1 iPRINTi-2,USINeF*:5«UI t J IF 6H < I > >=0THENPR1 NTII-2- TAB (68 ^;vPPlNT#-2,USlNGF»tlOf CLOG CGMd) >/LQfinO> }
1460 NEXT I
1470 CLS
1460 CLS: PRlNTei30, "PRINTOUT DF ELEMENT 0ATA"l PftIifTi-2, * "i PRIMT»-2 , - " ; PR I NT»-2 . ¥ V*
1490 PRINTt-2.TABU0iS**ELEMENT ■ - ; s PR INT#-2« TAB f 30t f "PMftSE " 1 1 PRlNTi''2* TAB (SOM "ANGLE " i tPftINT*"2* TflB(60J I "ArtPL^t tP ftlMr4-2.TAB<70) i "SPACING"
iSOO FOR l-2TQNliPRINTi-2,TAeu2 J;l|lPfllNTl-2,TAB(3lHAcnt ?PRINT#-2.TAB<5OU0niMP1^l NT»-2.TAB(62> ;♦' tlii tPRlMT■- 2«TABC72l sBaisNEXTI^PRlNTH -2 , i»:V» ; GOTO 1 200
J510 END
ence to tiie center of the chart and the reference ele- ment, in degrees around the compass [i.e., 45 degrees would be northeast).
Relative phase: Refers to the measurements, again as
3* 7BMagazm& • October, 1964
described above, except here it refers to the length of the feedline between the refer- ence element and the ele- ment in question (or the pri- or element if the elements are in series).
REUative) AMPWtude) of element: Refers to the amount of power this ele- ment receives (in the trans- mit mode) with respect to the reference element. If the power to the element in
question is the same as that of the reference element then the answer would be 1. If it is twice as much, the an- swer would be 2, and if half as much, .5 (here using an at- tenuator). In receiving-only
THE N2NY HAM RADIO COURSE ON VIDEOTAPE
1983 f4^'Hf Pfoojcltons; i*%.
INT
imM i^pi® ©mm
©H ¥9Pi®mP
Ham MasterTapes brings the best possible personalized Ham Radio icense preparation right into your own iving room. If you, a friend or family member wants the best help available to get past the FCC test hurdle, it's available now in Beta or VHS home */ideo format.
Larry Home. N2NY brings his 33 ;ears of Ham Radio teaching experience right to your home. Each of the 26 video essons has close-up details of com- ponents and systems along with superb graphic drawings. Each lesson has ,mpoTtant points superimposed over the action and reviewed at the end of each section. This makes note-taking a snap! Miss something? Didn't get it the first !ime? Just back up the tape and run it again or freeze- frame it for detailed :ios€up studyl
Larry's classroom is a real ham shack, Lee, a ISyear-old boy, and Virginia are ed through the learning process. The questions that they ask are the ones Larry knows you would ask i f you were rhere in person. You soon feel like youVe Dart of an ideal small class.
The topics covered will not only get ^^ou through the Novice test^ — General ziass theory is covered also. By the time ^ou get your Novice license, you will be able to upgrade to General or Fechnician!
Larry^s technique of involving the /iewer with the demonstrations makes
the most difficult topics easy to un- derstand. Understanding — not mere memorization — is what makes Ham MasterTapes so effective. When you study the 700 possible FCC questions, the answers wili be obvious,
Larry doesn't stop with just test- passing. All the proper techniques of operating practices and courtesy are demonstrated. The instruction manual for that new rig won't be a mystery! Larry becomes your own personal instructor to help you on that first set-up and contactf
The Ham MasterTapes series is produced in one of New York City*s top commercial studios. Not only is the production crew made up of real professionals but many of them are also licensed amateurs. Everybody puts in obvious extra effort to make the production a classic.
The 6-hour course is available on three 2-hour Beta D or VHS-SP cartridges for $199 .95, for individual ,home or nonprofit Ham Club use. (High schools or colleges must order our Scholastic licensed version, $499.95 for Beta or VHS and $750for3/rU'matic.)
To order, call or write Larry Home, N2NY at Ham MasterTapes, 136 East 31st Street, New York NY 10016, Phone 212-685-7844 or 673-0680. MasterCard and Visa accepted. New York state residents add appropriate sales tax.
1^271
Til.
Ham MasterTapes
THE N2lfY lUM RADIO COURSE ON VIDEOTAPE
136 East 31st Street
;;ew York. New York 10016
(212)685-7844 •673-0680
1^.1 M^si*- rrotJujC'"!^'! Ji '■ "L
SOME OF THE TOPICS COVERED INCLUDE
AMPLITtTOE HOOULATIOK DOUBLE SlDZBJMD SINGLE SIDEBAND rBEOUEKCY JSODULATION fUASE MDDOLATIQM StDEHANDS BANDWIDTH LlHlfS
DEVIATION
OVEHHOIXTtJkTlOif
SCATTER
FSEQUEMCT TRMiBLhTIOH
ASTENtfkS MftB PZtHVlSt^S
IfAGI AlTTESr^AS
QUAD ANTEWIAS
POLARIZATION
FEEDPOINT IMPEDANCE
HALF-WAVE D I POLE
QUARTER-WAVE VERTICAL
RAUIATION PATTEHNS
DIRECTIVITY
MAJOE LOBES
CHARACTERISTIC IMPEDANCE
STA.**T3rNG WAVES
ArrrE^iT.'A-fEEDlNC JtlSMATCK
STATION ID
CALL SIGNS
LOOGI7IG REQUIREMENTS
PVUES. LIMITATION
COMTSOL OF fiEQUlHEMEIiTS
P-S-T REPORTING SYSTEM
TELEGRAPHY SPEED
;2ERO-0EAT1MG SIGNAL
THAfJSHITTEIt TUNE-UP
TELEGSAPHV ABBREVIATIOWS
RADIO WAVE PROPAGATION
SKY WAVE AND SKIP
CHOU?^ WAVE
HARMONIC INTERFERENCE
SVm HEADINGS
SIGNALS AND EMISSIONS
BiACKWAVE
KEt CLI efts -CHIRPS
SUPERIMPOSED mm sptmioos Diissio^is
CGffPOTEHS OSCAR ATV-SSTV
OPERATING COURTESlf HLTLES ANP REGULATIONS OPEP^TING PROCEDtJRES RADIO WAVE PROPAGATION AJ^TEUR RADIO PRACTICE ELECTRICAL PRINCIPLES CIRCUIT COMPONjENTS PRACTICAL CIRCUITS SIGNALS AND EMISSIONS SAD 10 WAVE PROP AG AT I QN EMERGENCY COHKlfNI CATIONS TRANSMITTES POWER LIMITS STATION-ID REOLflRE^[E^^TS iHIHD^PAItTr PAimciPATION F&EtltJiENCY HANDS
sEi^imoN OF nazcitiEiierEs
R.C. MODELS
PRQKiaiTEp PHACtlCES
aADIOTELEPHONTf
RADIO TEL£PfiINTI3«G
REPEATERS
VOX TRANSMITTER CONTROL
BREAK- IN TELEGRAPHY
AKTENNA LlRIEJjTATION
INTERNATIONAL COMMUNICATION
EMERGEWCY-PREP MILLS
IONOSPHERIC LAYERS D-E-F
MAXIMUH USEABLE FREQUENCY
IONOSPHERIC DISTLIRBAKCES
SUNSPOTS
SCATTER, DUCTING
LINF-OF -SIGHT
t1?OPOSPHEHIC BEHDIND
SAFETY PRECAUTIONS
TRANSKITTtR PERFOHkANCE
Tw<>'TONE TEST
NEUTHALISI«i AMPLIFIEHS
POWER HEASUREMETIT
TEST EQUIPMENT
OSCILLOSCOPES
ML1.TIMETERS
SIGNAL asr^ERATORS
SIGNAL TRACERS
AUDIO RECTIFICATION
REFLECTOMETERS - SWR
SPEECH PROCESSORS
ANTENNA-TUNING UNITS
S-METERS
WATTMETERS
IMPEDAJJCE
RESISTANCE
REACTANCE
I34DDCTANCE
capacita:^ce
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conditions, the answer would always be 1.
!nput spacing of ELE- (ment): Refers to the dis- tance between the reference element and the element in question. This is not neces- sarity the same as relative
phase, above.
That's it! Experiment with it. You1f get some surprises when it comes to various values you pump into the phase-angle and distance in- puts as well as the layout of the array. A typical two^te- ment an^ay with the ele-
ments and phase angle set at 90 (and -90) degrees (a quarter-wave) will give a heart-shaped radiation pat- tern with a 3.0-dB gain and a 32-dB F/B ratio. Try others, including situations where the distances are less than the phase^angle figure.
Type carefully, especially from line 860 to line 950. ■
References
Oennts Mitchell K8Ua ^^Anlenna Engineer," 73, May, 1960. Joe Hypnarowski WA6VNR, "Ef- fective Grounds." CO, August, 1982
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Try Low and Behold
Here's a shock: You've been wasting money on towers
and poles. W1CV explains why low antennas
may outperform high-altitude aluminum.
St^ Cibitkco W1CV/4 FO Box 5616S2 Miami ft 33156
ttJ
LAYER
^/
Fig. 1. During the hours of dayHght, the /onospher/c F layer sometimes splits mto two parts, as showri at (al These re- gions occur at altitudes of about 100 miles (the Fl -layer] and 150 to 250 miles (the Fl-layer). During the hours of darkness and occasionally during the day, the F layer consists of a single ionized region at an altitude of 150 to 250 miles.
38 73 Magazine * October* 1984
We all have heard that the higher we put an antenna the better it wilt work. But this rs not always true! Especially if you are a contester, you can benefit from a knowledge of how antenna height affects propagation distance.
You have just gone to a tremendous amount of trouble — not to mention expense — to put your tri* bander up another 40 feet The new 90-foot tower graces your neighborhood. You drive up the street with pride Lay persons gape at the structure with awe A space-age communicator genius, that's you!
Finally, everything is hooked up and ready to go. You anxiously switch on the rig and tune to 14.225 MHz, getting 'ready for some DX. Sure enough, there's a CX3. You call him with the linear off, just for fun. A dozen others call him at the same time. You win.
A I A station calls you and tells you that you are the strongest signtil he has heard so far that morning. Morning? It's 7:00 pm! Oh, yes jet lag.
It works!
Now for a little domestic chatter. You tune further up the band, Strange all of the stateside stations seem weak. Well, you guess, it must just be the conditions- Twenty meters can be a fickle band. You call CQ. No answer- Again. No answer.
A moderately strong W5 station is calling CQ, You answer He comes back to someone else.
Several more failures transpire before you make a stateside contact. But he tells you that your signal is just S3. Imagine! What an insult!
Several evenings pass and half a Saturday before you allow yourself to won- der what's happening. DX seems great, but you'll get creamed in the sweep- stakes.
No Coincidence
There's an old saying that something isn't a coinci- dence if it keeps on happen- ing. Your new skyscraper antenna system just doesn't seem to work that well un-
so
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SIMGLE-«IQf> DISTAMC^, WILES
SOW
Fig. 2. The single-hop distance is related to the angle of ra- diation from the antenna, and also to the altitude of the ion- ized layer. The solid line shows the relation tor the F2 region for the average altitude of 200 miles. The dotted line shows the relation for the Fl-layer, for the average altitude of 100 miles.
less the other station is at least a coople of thousand miles away. As the weeks pass, you begin to notice that this effect is even more pronounced on 15 meters than on 20. And on 10 me- ters, it is still more vivid al- though it could well be the large skip zone that is re- sponsible for the phenome- non on that band.
What causes this?
For horizontal antennas, the angle of radiation de- pends on the height of the antenna above the effec- tive ground The higher the antenna above effective ground, the lower the angle of radiation. Your antenna is high. Therefore, you can be pretty certain that the angle of radiation is low But is that good? For DX, yes, It is good. But for con- tacting stations closer in, it may not be so good. Your signal might be going "over their heads/'
If you are primarily a do- mestic contester, you can benefit from a knowledge of the way in which antenna height affects the single* hop propagation distance. By placing your antenna at just the right height so the strongest part of your signal will land in a densely popu- lated area, you can gain an
advantage over a competi- tor who ignores the physics of antenna height versus performance.
Single-Hop Distance
How far from your sta- tion will the strongest part of your signal come back to Earth? That depends on the altitude of the ionosphere at the time and also on the angle of radiation from your antenna,
Most propagation in the high-frequency bands takes place via the F layer of the ionosphere. This layer often breaks into two levels dur- ing the daytime; signals are then returned by a region that is about 100 miles high. At nrght, the F layer ranges from approximately 150 to 250 mites altitude, with the average being about 200 miles. This is shown in Fig. 1 .
Since the ionized layer is usually higher at night than during the day, signal range can be expected to increase during the hours of dark- ness. And this is generally what does happen. If your antenna radiates most of its energy right along the hori- zon— that is, if the eleva- tion angle is zero degrees — the signal will "land'' about 1,600 miles away during the daytime and about 3,000
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AUMATKM UIGL£ OF LOifEST L,0^. DEGREES
90
Fig. 3. The lowest lobe of radiation in the yerticaf plane oc- curs at an angle that is a function of the height of the anten- na above effective ground. The lowest radiated lobe is of primary interest in most cases.
miles away at night. That's the maximum possible single-hop distance. The limiting factor is the cur- vature of the Earth.^
Of course, multiple-hop propagation makes it possi- ble to talk with hams all over the world, In general, the lower your angle of ra- diation, the fewer hops are required for global propa- gation. That's why a low an- gle of radiation is favored for DX. The fewer hops your signal must take to get to the opposite side of the world, the lower the attenu- ation will be.
But suppose you live in Washington, DC. and want to talk with someone in New York City. If your angle of radiation is ver\' low, most of your signal will overshoot its goal. You1l be heard very well in Green- land, perhaps, but not in the Big Apple.
The distance at which your signal 'lands" after a single hop is a direct func- tion of the angle of radia- tion The lower the radia- tion angle with respect to the horizon, the greater the propagation distance. Fig. 2 is a graph illustrating the function of one-hop dis- tance versus radiation an- gle, based on the average F1 -layer (daytime) height of
100 miles and the average F2-layer [nighttime) height of 200 miles.
What Affects the Angle of Radiation?
So, you ask. how does one control the angle of ra- diation from an antenna at the high frequencies? The answer is that a horizontal- ly-polarized antenna, such as a dipole or yagi, exhibits an optimum angle of radia- tion that varies directly with the antenna height above the effective ground plane. (A vertical antenna, assuming it has a good ground system, always ra- diates best at relatively low angles.)
The higher you put your antenna, the lower the angle of radiation will be, as a genera! rule.
We should take note that at 160 meters, it's prac- tically impossible to con- trol the angle of radiation from a horizontal antenna. Unless you live in the wide- open country and still have to register your tower with the Federal Aviation Ad- ministration, you can stop worrying about the prob- lem on that band. A hori- zontal antenna for 160 meters radiates most of its energy at very high angles, unless you put it at least
73 Magazine • October, 1964 39
250 to 300 feet above the ground. That's not easy! A vertical antenna radiates at somewhat lower angles — provided a good radial sys- tem is installed. At 160 me* ters the installation of an excellent radial system is no small task, either.
At 80 meters, the prob- lem still will not concern most of us. An 80-meter di- pole must be at least 125 to 150 feet up for the angle of radiation to drop much from the zenith.
At 40 meters, the situa- tion becomes different. For short-range communica- tion, a height of 30 to 40 feet is best; for intermedi- ate-range, 50 to 75 feet is optimum. That is not unrea- sonable for many hams (al- though for some it's an utter impossibility). For long-dis- tance work, the old DXer's rule applies: Put the anten- na up as high as you can,
At 30 meters and above, modest antenna height can result in an angle of radia- tion that might be lower than you want it.
How do we determine the maximum angle of ra- diation from a horizontal antenna, in terms of its height?
First, we must realize that the effective ground plane for radio-frequency energy usually doesn't coin- cide with the actual Earth surface. For flat, level ground without man-made structures, the effective radio-frequency ground plane lies several feet below the surface. ^ Ob- structions such as trees, utility wires, house wiring and roofing, and steel- frame buildings can raise the effective ground plane. In an area congested with steel -frame buildings, the effective radio-frequency grpund plane may be well above the level of the Earth's surface.
For the average residen- tial dweller, the effective ground plane is probably a little bit below the actual surface. In the city where
40 73 Magazine • October, 1984
aj
REFLECTED WAVE
EFFeCttVE ■SROUND
if/
AHJEtiHtK
Fig. 4, The direct wave and the ground-reflected wave com- bine, at a distant point in the sky, in varying phase, depend- ing on the takeoff angle. At (a) an example is shown of how these waves are emitted from a yagi antenna, At(b)a typical vertical-plane radiation pattern is illustrated for a yagi an- tenna at a height of a little less than 7 wavelength. (The low- er lobe is of primary interest in most cases.]
there are many tall build- ings of widely varying stat- ure, it can be difficult to estimate the level of the ef- fective ground plane be- cause of the irregular distri- bution of obstructions and because the effect of such obstructions varies with the wavelength. If your QTH is in the downtown area of a sizable metropolis, yo^J''! probably have to resort to trial and error to find out how your antenna height af- fects the angle of radia- tion—if you have any con- trol over the situation at alL
The effective height of an antenna is, in general, a little greater than its actual height in most suburban or rural locations. To obtain the effective height, add about 5 feet to the actual height.
Once you have deter- mined the angle of radia- tion that you want, using Fig. 2, you can determine the optimum height for your antenna, in wave- lengths, from Fig. 3. Where do we get Fig. 3? The signal
from your yagi antenna goes out in all directions. Although much of the ener- gy is propagated horizon- tally because of the direc- tional nature of the anten- na, some goes straight up and some goes straight down; some goes up and down at 30-degree angles with respect to the horizon. Overall, haff of the energy is emitted toward points above the horizon and half is sent out toward points be- low the horizon— that is, to- ward the ground. The ground signal is reflected at the ef- fective ground plane and is reversed in phase. It then heads back up into the sky, toward the ionosphere.
The familiar rule of op- tics applies to radio waves just as it applies to rays of light: The angle of reflec- tion is equal to the angle of incidence. Ground reflec- tion occurs at all possible angles of incidence; energy sent straight down from your antenna gets sent straight up, energy sent down at a 30-degree angle
gets reflected back up at a 30-degree angle. Ground re- flections occur over a large area surrounding your an- tenna*
At great distances and al- titudes, the direct wave and the ground-reflected wave combine in varying phase, depending on the angle above the horizon. Fig. 4(a) illustrates the geometry of the situation. Fig. 4(b) shows an example of the sort of radiation pattern that occurs. This phase pat- tern is quite complicated, but It can be determined by simple plane geometry. The lowest lobe — the one that occurs nearest the hori- zon—contains the most sig- nal energy of any lobe. The angle at which this lobe oc- curs, as a function of the height in wavelengths, is the lowest angle at which the direct and ground-re- flected waves add in phase. It is this angle, as a function of the antenna height in wavelengths, that is shown in the graph of Fig, 3,
Optimum Angle Versus Height in Feet
Most of us have antennas that stay at the same height all of the time. Variable- height towers exist (but those of us who have '"crankups'" generally think of such towers more as '^crankdowns'' —to keep the neighbors from suing for half the gross national product because of the eye- sore), and from the above discussion it should be evi- dent that they can be used to advantage in medium- range operation.
Your antenna height in wavelengths can be deter- mined by a simple formula, assuming you know the fre- quency or wavelength and the height of your antenna in feet The following for- mula applies, letting h rep- resent the height in feet above the actual ground surface, f the frequency in megahertz, and y the effec- tive antenna height in wave- lengths; y - [h -F 5)f/984.
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BIRD Wattmeter *43 6t elements in stock CALL
** v/A A d'C r% L I , , ( 1 1 i I b ■ 1 ■ I ■'■ I'l I , ■ I per ro" ■■■■ .,..i...,i.uu
QSL Card holders for 60 cards..,. 2,00
TRIPPUTE PR25 20 amp 12VDC regulated ..,,99.95
TRIPPUTE PR36 as above but 35 amp ..169.95
AMECO preamps ,.,.., [bss 10%
TUBES
GE6146B , 9.95
bimoc j-oUUZ r, r-in i-i HI s i-i m-1 -- -■ --■ - w.vo
Hard to tind tubes?? Try us, CALL
SURPLUS
New Guarntd-CDE 2PDTencl RELAY 10A 6.00
2.5A/1000PIV epoxy diode 29c ea or 19.00/100
COLLINS F465J05 CW Fiiter[75A-4) New 95,00
it we advertised all that we stock, we could fill more than 20 pages like this, We don't print a catalog either, we save the money so we can pass the sav- ings on to you. Call us for any of your electronic needs, we have been In business for a long tima and our customers are our best reference,
EQUIPMENT
As you know, Madison is an authorized deaier for all the popuior equipment lines such as: DRAKE, KENWOOD. YAESU ICOM, KDK. TINTEC SANTEC etc BE SURE TO CALL US FOR A PRICE BEFORE YOU MAKE ANY EQUIPMENT PURCHASE. WE WOULD LIKE YOU TO BE OUR CUSTOIVlER
KDK FM4033,,.INEW 220mhz. 349.00
KDKFM2033 , ,289,95
SANTEC ST142..,... ++FREE GOODS+ + 299.95
SANTEC ST440up vyK,-. 250.00
KENWOOD TR2600 ^i^M.. ........CALL
I In n I C^ ^OVn ■ atVii n*ii-t,t^f*i'lif'*'mix**%4fnm- • ■ ^ Clr V , U U
lVi.rwnn ]%j-"Ui/AI , , , . , , , , . , . , , .4 ■i-riiiip. , .,.,.,..,.*.,, n . . ,^,^r^LL
TOKYO HI POWER omps .less 15%
MIRAGE amps ., ..., less 12%
VOCOMM amps .,.. ,, CALL
TOKYO HI POWER HC2000 tuner ,, 289,95
lOKYO HI POWER HC4D0L tuner.. .,,„.,. ..,129,95
TOKYO HI POWER HC200 tuner.,,.,,. ...>,.v,„.B9.95
DRAKE MN75 ., > 125,00
WM. NYE MBV 3KW tuner & ant switch. 469.00
WM NYE A&t phone patch
tor ICOM (8 wire) , ,^62,00
BEARCAT DX-IOOOmm/m. ..,- - .499.95
SIGNAL ONE MILSPEC T030 , 6295.00
ACCESSORIES AVAILABLE. ..,.-,....,. ..,,,1 CALL
800KS-We stock a wide se'lectton of books on Electronics, Communications and Computers.
SUPER CIDSEOUT SPECiAL-^LIMITED TIME ONLY AE A AMTl a great way to make any computer worl< AMTOR. RTTY and CW. The Terminal unit and the Sottwrare in on© package, Use with any RS232 com- puter output and your Modem program !o oper- ate AMTOf?,. RnY or CW. CW board and SOFTWARE FOR EITHER THE ViC-20 Or COM-64...
WHILE SUPPLIES LAST S359,95
AEA MBARCREADERCODE CONVEiTrER,,.259,95
POLICIES— MASTERCARDS. VISA or CO.D
All prices FOB Houston, Texas, except as noted.
Prices subject to change without notice, subject to prbr sale Used gear sale price refunded if not solEsfied. Call anytime to check status of your order Texas residents add sales ta?£.
ANTENNAS
ARX2a V2S. 2MCV-5. ISOPOLE S39.95
J 4^J |pj|"P|h'>l''lf'4l''' f. .. -■■■■|i'*P"lhi<''l'l^ll"i'M'i*<"i''IPii"ii ■■■■ ^— I 7 F 7 \J Jii|. ■q|-Bjia;si|B|pq|i|i|iiiB3Bi|iiia|iMBaiB|iiBiiiirar'BiBBiB-ir. ■■■■ ^^ ^r r r r ^J
402CO..... .,.,. ..,..289,95
l\0' ■■■■■'■■■■■niairBriiaiMiHiiii-lrnlBird ^^H 1^ « l-f^ f^ ITfl. |-« If.^ | 1i4lllllb>'^/ 7 I T'sJ' In U-llI l%? I W-O I V ■riiilnil.iarlh'llli'll-'ll-qil-IF V P<| ^'P^ | ■■l4ll--IPllll^qh4 PvTl'^V'
G7-444 119 95
Butternut HF6V..,60 thru 'tO vertical ..,.125,00
HF2V....&0 and 40 vertical 125,00
70CMCV-7..7Dcm vertical collinear 39,00
Barker & Williamson
fvt jtO veiTJ ca I n r - , . 1 . . r F , . . , - , r 1 .1 1 i 1 * tM^'if it H i . . . 1 n , ■ 1 . , t . , vu. uu
AR25 radial kit for above,. .„,l^',i..:;.......'... .19.50
AS160 (160-80-40-20) 137' 115.00
ASaO (60-40-20) 78' .., , 89.00
AS40 {40-20^15-10] 40'...., ,,. 115.00
AS20 (20^15-10) 23'.,. 89.00
HyGaln
I jI / \—/jf*i.fS ■■■^■■■■■■■■■■raHaHaalafrihal^a.lfarilairllall-JtHliJIdl "'^ib-^ . 7^
rn >7W J^^^ tl hi4i|pi:^akl>l^d I llbH IHri b4l<IJ lit'hri'lll h H t- 9 LI4 ^-Ib^ ■>■■ tdhj i hi 7^t7 P 7%,/
7-1, 40 meter rotary dipoleit.MmnT-frt.t- 156.00
7-2.,2 element 40M beam ......V..^.^ ;,',;...' 349.00
Dpreotor kit for above for 3 el. 40M 219.00
n VjJI I I ^ laiHiiBiaii ■■■■■ial>iiiialrll-alpll ll-ll'lt-;4IIHI|,ini-4IPIIII>' ItTi 7 A^ H Qfn I ii A I I ri I P I I 4 I ^ I i i i ^ I F I I - I P I I 4 I - I I - * - - - ■ I i i - Z^V . VO
NOTE: HyGain accessorfes shipped prepaid from the factory with tower orders,
^H I V i I ^m^ la^rT^*' ■-■-.^.■■^'^'■^■^■'■'■^■■'■■■■'■■■■^■^■■■^■■■■■iiiBiB.jL. ■■■■■■i r r ■ J KJ^
^EVI 1 4^ ,.,,,, .4 .1 f ii-ii^H ■■"*■ • > •■ I .<*>*i*>»^n p.4.,.i,*..,> ., OO jkJU
^ pVI:,^ ^^^ I I >< I i; I I 4 -I I *-f.p b t,*r lli||ii|»|iiiiJi"l»^l"J""i"i""i="Jiiii"i"iiii I JT*7 "hJ
iL PVI I C^LrP'^ ■■ ■■■ ■■■^■■aiBiiiiB ■> Bih-liaiBr^ i[i * i b 11 I ri I /Ti 7w
-'-t>Jr.^~'vV« B-^^^ ■■■■■■iiiaiiiiHiriiiiBipB ^m.r p<iak|b4 ^wtpii ■4fe4 I 11 id IRI k I P W^ vVJ
^\J'^~ IDkfc^i ill Ptrfli S^^"^ I ■ J »■ I .4 h^;f i-Jjf f i.j|j^it»i*|ii I I hiHhi I I I Pri I 1 1 ' ly*- T%/
-MO'^'' I L/L_[j iiw biVl-^ll'l 4 frl 4-bri-fari l^l^b'^ii 4i kni'li I I It P 14 I #4° 14 4 ■> pq>> I " ■ v1^>^^
I T J I wTV I I '^Vll^JU" W iSi e4lBlb4lllri4l-lll-ll'4IPII-.4hlltll"-l>4lll""PPI"1"" 1/ ti\J\^
AEA Hotrod HR-I .,.h..,,,. 16.00
VALOR mobile antennas 75-10M. ea ..20.00
AVANH ASP151 3G thru the glass 2M,. 33.00
ANTECO 2M„,5/8 MAG MOUNT, compi 25.00
METZ SW'1 SWL ANT.aOkhZ to 54mhz 59.95
DB+ Enterprises 2ei, Quad 279.95
wye 160 + 30:HDDipole 69.95
W1JC 160 + 40 HD DIpolQ.o^^*.,.,..,..., ,,69.96
MADFSON STOCKS A WIDE SELECTION OF ANTENNAS ... PLEASE CALL FOR PRICES
ROHN 50' tower consisting of 4 sections ot 25G,
1 section of 25AG-2 or 25AG-3 269 00
ROHN FK254a prepaid 799.00
SPEQAl I \ \ ROHN lOWER SPECIAL 1 1 1
25G,.,,. ,.,..per section....... , 46,00
45G per section ■.;i.v.v.. 107.00
OCk^ .1 t(*"ii mn Fi , ,4 .1 , , ifJ"! St't.'l I vJT 1 .., , ..,.d ,^.'^^LL
GENUINE ROHN ACCESSORIES iv....... ...... CALL
Atllance HD-73 ,.- 99,95
AMPHENOL
PL259 831SP sllverpiate. , ..1.25
UG1 76 reducer RGeX/RG59 ...., ,30
4400 N Male-S0239 ..f-i..„,*iMvw,6.00
2 900 B NO Ma I e-S02 39 . ,^vii . k^u. .«vtvv. ..... 4.00
6261 N Male 3.00
Other Amphenoi products In STOCK - CALL,
BELDEN
9913 tow loss, solid center conductor, foil & braid
shield - excellent product. ,....,.45Qfll
8214 RGB foam........ .....,>. .- 43Qtt
0-idj / l^^O ii^Mi^fi', ... ^ , I . 14 fa 1 r-i I >. I I 1 I 4 I I- I iOOWTP
C^.^lrJ / l'^\7.^ \ \J ... ..■.pii.1h4lkilli|l-4l^ll>«l-ll-4l'-l>l!>'ii ■■■■■■ ■«■■■■ W.^>? " II
8235 300 ohm KW twintead 23cm
6000 44ga stranded copper ant. v^ire .....13<#t
8448 8 conductor rotor cable., ,,.. 31<#f
9405 as above but HD-2-16ga d^lSga ,.52c#t
8403 MIc cabEe 3 condctr 8c shield SOoft
100 feet 6214 wfends Installed....,.,... ,..,.45.00
COMPUTER CORNER
This monlti Madison Efectrontcs Supply has two package $peciaJ$ tor those of you tt>at are interested In getting Into the world of RTTV / AMTOR. Both of these packages include fuJi functtoo Morsei Baudot ASCII and AIVSTOR modes of operation.
Rackage 1 includes a se[f contained unit that plugs directly into your Commodore 64 and a spectrum analyzer type tuning indicator that Is as good as a scope tor tuning.
AEA MP-64/2 TLi & Softwear retail 239.95
AEA TI-1 tuning Indicator retail 119.95
AEA AC^1 12VDC power supply retail 19-95
One Mic Connector 4 or S pin retail 4.95
TOTAL $384.80 PACKAGE SPECIAL I $269.95 YOU SAVE S$S
Package 2 Is the highly acclaimed CP-t TU with the new MBA-TOR software, a high performance paclc- oge for the more serious operator,
AEA CF1 TU retail 239.95
AEA MBA40R Software for C-64 retail 119,95
AEA TI-1 Tuning Indicotor retail 119.95
One Mic Connector 4 or 6 pin retail 4.95
TOTAL S4&4.80 PACKAGE SPECIAL! $369,95 YOU SAVE $$$
MADISON STOCKS AU AEA PRODUa
PLEASE CALL FOR PRICES..,. ., EXAMPLES
CP-1 .,,...,. -Oomputer Patch Interface
CP-1/20 above WMBATEXT VIC-20
CP-1/64, ....... ..above WMBATEXT ChM
MF^20 ...MiCROF^TCH Hardwar^oftware .,
MP'64.iw.M.,...as above for COM'64
MBATEXT Software VtC-20 & COM'64 ,..,
MBA-lOP Software.. COM'64,...w>iii,i
MARSTEXT MARS Software VlC'20. COM-64 PLUS Software for APPLE, IBM, PC KAY-PJ?0 TRS-eO, MOD III & iV. and HEATH H-e9
UNES...
'."i9M5 .239.95 .239,95 .149,95 ,149.95 ,..89.96 ...99.95 89.95
...KANFRONICS Has A New Productil UTU
Tt^e Universal Terminal Unft works with any computer that has a RS-232 port. Contains the terminal unit and the software to work CW. mTY, ASCII and AMTOR. All you need is a terminal communication program to drive the unit and a 12VDC power supply.
MADISON HAS IT IN STOCKIl 169.95
MADISON STOCKS THE KA^^rRONICS LINE-CALL FOR
r^ P^ I ^^ ^O I t I 1-4 I 4 h I ^ ■ li t>> g V ^ ■ 4 4i i " . I . ^y\/~1 IVIrLCvJ .. I l^-44'l4<^ibp4'p41>|ii Fiji >l' hi i I r ^ I QlTr fTi^^^t JI K4|a"lli"J|"f"'«-1!"l"'«""'"'"J'"''"«'^''"'f'"'"'^ri«iw7' ' W
HAMTEXT ..,VlC-20 COM-64 ,69.95
AMTORSOFT VlC-20.,.,.....CQM-64 79,95
HAMSOin ,*n.,i,,4. ,,..VIC-2u Mi,..t"ninn"k ,0V, Vo
PLUS Many Other Items In Stock. CAil for iNFO
NAL
iLikjiBirjiBiiiiiiiBiliiiii«iPli4lBlh4 I I.F ik LiiBiDiiq1l«lBllall4lplli|i|K4l"iiiM
Most Items In Stock Including The New Af?Q-1000 AMTOR Untt Col! For Current Prices
SUPER CLOSEOUT SPECIAL Nlll
AEA AMT-1 includes CW board 359.95
AEA M8A-RQ,..v.. ■ ...,.,259.95
NEW! NEWt NEW!
AEA PACKET-PKT-1 packet controller - assembled, tested -complete incl. pwr ...ready to go ,.,499.95 SWLTEXT software C-64 99.95
MBATOR software, VIC-20 99.95
D0N3 CORNER
Well. It seems like the contest season just ended yet here It Es again. Tt>ot mecins Ifs time to check out all tho equip- inent OTicf ftve antennas. Coax se^ms to be the biggest problern down here rhi$ year. So be sure that you check out the coax so you can get ttie Ja^i bit of gain irom the anten- na, BELDEN J^os o nevj affordable profess ionai cook ttiat Is very popular w^ith the guys in ttiis area; it is the 9913 low loss RQ-S type coax. It Is very low loss up to 1.2 Ghz. Loss betow 50 Mh?. is fess than .9 dt^lOO feet. At S.45/foot it Is a real bargain. It uses the normal connectors and as always, be sure to use COM\X-SEAI on all ttie expo$sed connecttons. TJI next months 73,
For example, suppose your antenna is 50 feet above the ground surface. Then the height in wavelengths above effective ground, at 14 MHz. is (50 + 5) X 14/984, or 078 wavelengths. At this height the optimum angle of radiation from your antenna can be deter- mined, from Fig. 3, as ap- proximately 20 degrees.
Now, using Fig. 2 you can find the one-hop distance for F1 -layer or F2~layer propagation. During the day you should expect a distance of pretty close to 500 miles via the F1 -layer, assuming this layer is ionized at that time. (If not— and the F1 -layer is not always ionized during the daylight hours "the propagation will occur via the F2-layer.) At night or if the F1 -layer is not ionized, you can expect the propagation distance to be about 1400 miles.
Let's try this in reverse. Suppose you want to keep a schedule with a friend whom, after yoy have checked on a map with a
ruler against the mileage scale, you have determined is 1640 miles away, You de- cide to try 14 MHz, since that band has been pretty good lately. How high should your antenna be, as- suming you want to have the sked at 9;00 pm?
Look at Fig. 2, at the F2-layer (nighttime) line, and you can see that the op- timum angle of radiation is about 15 degrees. How high should your antenna be? Checking Fig. 3, you can see that the height should be just about 1 wavelength above effective ground.
Now, we must convert this value to feet. The ''inside- out" version of the above for- mula can be used for this purpose: h = 984y/f — 5. At 14 MHz, with y = 1, we have h = 984 X 1/14 - 5, or h = 65 feet This isn't ter- ribly high. If your tower is 90 feet high, you may well overshoot your target.
Conclusion
Neither the ground nor the ionosphere is perfectly
predictable. Certainly there will be exceptions, in prac- tice, to the guidelines given here. The most notable ex- ception is that the F1 -layer may fail to ionize during the daytime and you can- not tell until you find out by trial and error The ionized layers vary somewhat in height, sis well, and thus the above formulas are not ex- act. The effective ground plane in your location may not be exactly 5 feet below the actual surface.
We are deaf in g with vari- ables. But it is certainly bet- ter to have some idea of how high you should put your antenna, instead of no idea whatever, or a grossly erroneous notion. The above information should give you a very good idea!
Probably the best ap- proach for optimizing an- tenna height is the crankup tower or, better still, a mast or tower with an electric motor so you can raise or lower your antenna by re- mote control from th^ stai- tion. This would allow you
to actually listen to the sig- nals from a certain area, and thereby optimize your antenna height empirically (after getting the general idea by using the graphs and formulas given here).
Antenna height is, at the high frequencies, only slightly less important than the direction in which it is pointed. We would not think of pointing a yagi west if we wanted to work a station to the south of us. Similarly, an antenna that is far too high (or, less fre- quently, not high enough) can detract from the signal strength. The contest opera- tor, especially, should at- tempt to optimize the an- tenna height as well as its direction. A slight edge can, as we know, make a big dif- ference. Number 2 differs from 1 by 100 percent! ■
References
1. The ARRL Antenna Book, 13th Edition, 4th Printing/The Ameri- can Radio Relay League, Inc., Newington CT, 1977, page 17.
2. Ibid., page 46.
Amplifier
Alois — 6 Meter Amplifier
10 Watt* tti— ISO Watt* Out
A]i hflndc Operation with Rk Preamp
Remote Keying
B23A— 2 Meter H/T Amplifier 2 Wiitti ln-30 Wattft Out
All Modi? Ojitradun with Rx Pream.p compact Siie {W'Xl'X T"")
B1D8— 2 Meter Dual
Purpose Amplifier
10 WattB lti,_«0 Watts Out
2 Watta In— 30 Watts Out
All Mode Operattorts v,'itli Rx Freamp
BZIS— 2 M*ter H/T AmplHer 2 Watts In— ISO Watte Out Designed for H/T use All Mode Optration with Rjc Preamp
B 10 16— 2 Meter Dual Purpose Annplifier
10 Wa^cs lo— 160 Watts Our
2 Watts In — 60 Watft Out
All Mode Oporaiion with Rsi: Ptearnp
B1016 — 2 Meter Amplifier 30 Wsitti Jti— 160 W»tt« Out Operares with 2 to 50 Wstis Input Al[ Mcxle Opeiarloti wttii Kx Preamp
C22A~l'/^ Meter H/T Amplifier
2 Wattft In— 18 Watt* Out
Compact Size (3'/^" X l" X 7")
All Mode Operation with Rx Preamp
ei06— 1'/4 Meter Dual Purpose Atnplificr
10 Watts In— 60 Watts Ou^
2 Watts In— 2J Watts Out
All Mode Operation Wfith B-x Preamp
C211 — 1'/4 Meter Amplifier
2 Watts In— 1 10 Watt6 Out
high Power H/T Amplifier
All Mode Operation with Rk PreoTiip
C1012— I Vt Meter Dud
Purpoif* Amplifier
10 Watts In— 120 Watts Out
2 Watu In— ^0 Watts Out
Al] Mfxie Operation wUh Rs Preamp
0012—11/4 Meter Amplifier .^0 Watti In— 120 Watts Out
1 Watt* In— 40 Wfltts Out
All Mode Operation wuh R>f Freamp
024—430-450 MHi Am^lifSer
2 Watts In— 40 Watts Out
All Mode Operation FM.SSB^CW.ATV Optional "N" Type Connectors
01010^430-450 MHj Dual
Purpose Atnpiifier
10 Watr* In— J 00 Watts Out
ZWattsJn— 4SWattiOut
All N4t>dc Operation FM,SSB,CW,ATV
Opttonal "N" Type Connettora
D3010— 430-450 MHx Amplifier 30 Watts tn— too Watts Out Alt Mtxie Oivration FM,SSB,CW,ATV 2 lo 35 Wans Input
BACKED BY THE INDUSTRV'B ONLY 5 Yl: AR WARRANTY Set' the complete line tif Mfraj^- RF ArnpiifLtr'b. Penk Rniding Watt- SWR Meters and accessories at your Icx'^il dcattrr or contaa:
^iMBK^B
P.O. Box 1000
Mor^^n Hill, CA 95037
(406)779-7363
42 73 Magazine • October, 1984
What you DO get is one compact package that TURNS ON RTTY BEADY — No program load, "SYS" commands, or rats nest of external wiring to enjoy the
best in CW/RTTY operation. (AMTOR too, if added.)
The simple, uncomplicated design and ease of operation are not to imph mediocre performance. On the contrary, Microlog's years of software and hardware experience combine in the AIR-1 to provide a level of performance found only in much more expensive dedicated systems™ Compare for yourself or ask an AIR-1 owner, they're our best salesmen!
• Computer-enhanced detection niean<^ extensive use of software digital filtering technK]ut\s far noise and bandwidth that track the operating speed and code*
• Full speed RTTY 60 to 132 WPM, CW to 150 WPM, Ik 110/300 Baud ASCII.
• Choice of full- or split-screen display with large type ahead text buffer and programmable memories,
• On-screen tuning indicators mean you never have to take your eyes off the \'ideo for perfect copy tuning. RTTY "scope" cross-hatch and 'red-dot ' signed acquisition monitor right on the screen.
Ke\"word or mannal control of VIC or Parallel printer
and receive buffer storaue.
Convenient plug- in jacks for all cumiections.
Single board d^gn contains TU At EOM software that
doet* not require external power.
Full one-vear \\arrant\':
WRU, UNshift On Space* Word wrap-around. Test
"Quick Brown Fox * & 'RYRr' in ROM. Break buffer,
Random Code generator. Hand key input. Real-time
clock, sturdy metal cover and more,
MR-l for VIC^20 or C^64 $199 (with AMTOR $279). Microlog Corporation, 18713 Moooev Drive, Caithersburg, MD 20879 Teh 301-258-8400
MICROLOG
^51
iNNOVATORS /N DiGtTAL COMMUNICATION
Nolf: VlC-20 is a triidcmnrk of Coflfiinqdcire Eiectrtmics* Ltd. Cfip)^^t ^U9S4 Microbg Corporation
John M. fr&nke WA4WDi 1310 Boiling Avenue Norfolk VA 2,m}8
A No-Holes Barred Beam
What to do when the lease says ''no antennas'': Turn your entire house into a broadside dipole.
Problems common to am- ateur-radio operators who rent homes or apart- ments or live in condomini- ums or town houses are re- strictions on antennas, I rent the house that I pres- ently live in and miss the freedom to put up towers or antennas indiscriminately. Howiey>&r, I have not given up. Examples of my past so- lutions to this antenna problem (for the microwave spectrum) have been re- ported in this journal.!
A more recent antenna project was to improve re- ception of a distant channel 2 television station. The sta-
tion, in North Carolina, is the only station within 150 miles that carries "Monty Python's Flying Circus'' — a program to which my wife and I are thoroughly addict- ed. Our landlord, who has a strong distaste for Monty Python humor, will not per- mit a three-element beam for channel 2 to be mount- ed on the chimney. What does this have to do with amateur radio? Channel 2 is close in frequency to six meters, and the antenna presented here can easily be scaled for six-meter, IOmeter, and I.S-meter op- eration or scaled up in fre-
quency for 2-meter or IVa- tion is used, omit the 0.82 meter operation. factor.
The window-mounted VHF antenna. 44 73 Magazine • October, 1984
An essential element of the design of this antenna is the design of the house. My house meets the two design requirements. First, one side faces the television sta- tion that I wanted to re- ceive. Second, the house has aluminum siding. Up to this time, I had considered the aluminum siding to be a drawback. What amateur- radio operator wants to live in a shielded box? But now I had a use for the siding; it forms a reflector screen for a single-element broadside antenna — se^ Fig. 1.
The driven element is a half-wave folded dipole; [Even though the antenna is used only for reception, the active element is called the driven element.] The folded dipole is made from 300- Ohm twin lead. The length of the folded dipole is found by: L (ft.) = 492/f(MHz) X .95 X ,82. The factor 492 accounts for the speed of light in English units, fring- ing effects are represented by the factor 0.95, and 0.82 is the velocity factor of common television twin- lead. If open-wire cons try c-
The driven element is fed with twinlead although the feed impedance is probably closer to 200 Ohms. A 4-to-1 coaxial balun would prob- ably result in a good imped- ance match to 50Ohm cable. The driven element is spaced 0.2 wavelengths in front of the siding; S (ft.) = 984/ f(MH2) X 02.
Simple enough? Yes, but the hard part is how to con- struct and mount the anten- na without drilling holes, and still be able to rapidfy erect or remove it. The solu- tion I found is shown in Fig. 2.
A frame is constructed using PVC plumbing tubing. This modern synthetic ma- terial is cut easily with a hacksaw and spliced with a fast-curing cement. Re- member when glue and paint would dry? Now it cures, hardens, fuses, or passes through some chem- ical metamorphosis! Any- way, T fittings, elbows, 45-degree bends, and end caps are readily available at most hardware stores.
The frame hooks onto
-The
HAM SHACK
220 N. Fulton
EvansvilleJN47710^ 812-4220231
812-422-0252
l^gM^TCmd
i^EA
Pnc*$ tna Avmtimtttiiiy Suitf^ct to Cft*ffge
'■' \ f^ or Vic ^0 Softrtdrt? Kickjgo
Kr-fed Interface P.iCfciSge
144 IsopoTf^ Afitcri,i. .
HDA-TOft Sotti*j^re ,
ALUAMCE
i»-nO Small Clev^itiO" Rot.itar . . . ANIEHN A SPECIALISTS
APR 45U.5& Ua nu: h^h on <jT4SS ASTRON
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^■^ii^s 7.S-in |
AlBp PliBIT Suppl> |
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;p P'jwrr Supply |
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f^^^ PiMew \ut»H V |
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CONNECT SYSTtM |
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45.00 99.00
49.96 i >4,50
S 49.0(1 t -. JO
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the windowsfll and is spaced away from the house by two legs. The legs have end caps to prevent them from marking the sid- ing. The folded dipole is in- side the long horizontal piece. The feedline is inside the center leg. The antenna shown was constructed from y?-inch (inside diame* ter) white tubing. The white tubing is almost invisible against the white siding. For ten-meter or longer wave* length bands, I would rec- ommend one-inch or larger tubing, For six-meter and higher frequencies, 1 would stay with the cheaper V2- inch tubing.
The central leg was fabri* cated first. After the ii-i'ti line was threaded down tliu tubing, the driven element was soldered to the feed- line. The driven element was laced to a long, thin wooden stick to prevent it from twisting. Then short sections were added to each side, the spacer legs
SCftEEM
. CftlVf^ ElCUEIiT
^^'*',7sir**^^
40?
Fig. 1. S/ng/eHe/ement broad- side antenna.
added, and finally the end sections cemented on, com- plete with end caps. The completed antenna quickly hooks in place. When not being used, it is lowered with a cord down behind the bushes.
The antenna has been a complete success and is still in use. The total cost in- cluding cement, tubing, and twinlead was less than fifteen dollars. The design can readily be scaled to am- ateur frequencies. One could be mounted on each
Fig. 2. PVC window mounting
of four walls to achieve om- nidirectional coverage. The beam pattern can be wid- ened by increasing the di- pote-to-wall spacing to three- eighths wavelength. The center and spacer legs could be left uncemented and assembled with a lock pin or screw to allow the an* tenna to be collapsed enough to pass through the window and eliminate low-
ering it down after use. [Be- cause of the way siding is mounted, this method is us- able only for horizontally- polarized antennas.) Build one and let me know how you like it ■
Reference
1. ''Try the GHz Getter," 73. Oc- tober. 1982. pp. 50-52, and 'The Amazing Cylindrabola," 73, Sep- tember, 1383, pp. 54-55,
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46 72 Magazine • Ctotober. 1984
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Challenger's four pole switched capacitance filter gives sensitivity and selectivity found in units costing much more. And with only 5nivRMS of audio required to drive Challenger, you can really chase the weak signals. With features like Scope Outputs. Direct FSK or Crystal Controlled A FSK. and an Extruded Aluminum Case, you know this is Kantronics quality.
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Kantronics Software
Hamsoft — Send/Receive CW, RTTY, ASCII * Split Screen Display* Message Ports * Type- Ahead Buffer * Printer
compatibility,
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Specifications
Editing* Receive Message Storage * Variable Buffer sizes * Diddle * Word Wraparound *Time and Text Transmission.
Hamsoft/ Amtor — Includes all features of Hamsoft plus communication in all three modes of AMTOR,
Amtorsoft — Includes all the features of Ham text but is for use with AMTOR ONLY. The Apple program is available only as a Hamtext/ Amtorsoft CO nibi nation.
Supertap — Receive Only CW. RTTY, ASCII, AMTOR * Decode inverted, bit inverted, and unusual bit order* Multiple line display * "SCOPE" feature for baud rate measure.
Input Filter — Pour pole Switched Capacitance Filter with l7UHz Shift RTTY bandwidth of 260Hz nominal. Copies any shift*
Audio Input — Minimum level SmvRMS. input impedance is 600 ohm.s unbalanced. Accepts baudot or ASCII code up to 300 baud, Miix input level is 12VRMS.
AFSK Output — Crystal controlled, IV!ark-2125Hz; Space- 2295H2 (170 shift). Level lOOmvpp (35nivRMS) standard. Optional 500mvpp (175mvRMS). Output impedance 600 ohm unbalanced.
FSK Output — Open Collector *40 VDC Max. Polarity can be reversed.
Scape Output — lOK ohm output impedance.
PTT Output — Open Collector *40 VDC Max,
Computer Connection — TTL Compatible. Inputs also R8232 level compatible.
Power Requirements — 11 to 15 VDC (12VDC nominal) 75ma
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Weight — VVa lbs.
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Another Eggbeater
Don't be a VHF weakling. Punnp up your performance
with this simple 2m omni
John Stddley WD5DNL Rl X Box ^56 McMesier OK 74501
Many two-meter anten- na construction arti- cles have appeared in the past, probably more than necessary. Even so, here is my adaptation of an anten- na from the April, 1971, issue of QST. The antenna was called an eggbeater. It is two full-wave loops mounted at
6Tf.
OVERALL LENGTH
20 in,
right angles and fed 90 de- grees out of phase to pro- duce an omnidirectionai, horizontally-polarized an- tenna. The round loops were changed to the more famil- iar square configuration. The feed line is attached to the side to produce vertical polarization. The phasing and feedlines are twinlead (300 Ohms). The balanced line is brought into the shack where a tuner is used to match to 50 Ohms.
Construction
The antenna uses a six- foot piece of wood (V x 1 ''] as its center support. Two twenty-inch cross pieces are
METHOD OF MOUNTING CROSS
BOOMS. USE WASHERS ON BOTH SlOrS OF BOLTS TO PREVENT DAMAGE TO WOODEN W^ST AND BOOMS.
used (I used scrap pieces of molding, buti" X 1'^ wood will work just as well).
In preparing the center support for mounting the elements, it will be neces- sary to drill two holes at the top at right angles to each other. See Fig, 1. The exact size will depend on the type of wire used for the ele- ments; just make the holes large enough for a snug fit Measure twenty inches down from each of the top holes and drill two more holes for the bottom of the wire elements. See Fig. 1. Mount the twenty-inch cross pieces ten inches from the top holes. Use two small
fig. 1. Center-support drilting guide.
48 73 Magazine • October, 1984
F/g 2. Cross-boom mounting method.
screws to fasten each boom to the center support. See Fig. 2.
Feedpoint insulators are PlexiglasTM^ three inches long and one and a half inches wide. These ar^ attached to the cross booms with small screws. Holes are drilled one inch from each end of the Plexiglas insulators, and the feedline and wire elements are attached here. See Fig. 3. You can use solder lugs and screws to hold these wires to the insulator (or washers and screws). The first method with soldered connections is recommended.
Insert the wire for the ele^ ments in the holes and bend them into a square shape twenty inches on a side. See Fig. 4. Use #12 copper, either bare or insulated. You can use a larger size of alumi- num wire, but this will make it necessary to experiment with the length to achieve resonance. The wire used in this model is #12 copper that is 81 inches long and was salvaged from a piece of electrical service wire.
The feedpoints for the an- tenna are attached to the in- sulators and the opposite sides of the loop are held to the cross booms with fishing line. See Fig. 4. Two small holes are drilled and the fishing line is wrapped around the element and the
3 in
I
.-^M, yj
IrE in--
ATTACH AhUENNft WIRE. BALANCED FEED AND PHAStNQ LIME HERE. SOLDER TO UU<3S FOR fl 500D ELeCTRlCAL COHN£CTION-,
F/g. 3. A P/ex/g/as™ insulator
boom about ten times at each hole. A dab of epoxy glue covers the wire and fishing line.
Attach the phasing line between the two feedpoints. 1 use hviniead sixteen inches long. The main feedline is also 300-Ohm twinlead and is connected to either ele- ment The feedline is then taped to the wooden center
support. See Fig. 4. Electri- cal tape is used to secure the phasing line also. Standoff insulators are used on the metal parts of the mast
Conclusion
Use a good grade of twin- lead and plenty of standoffs to preserve the balance of the line. Weatherproof the wood used (several coats of
THIS EftD OF THE ELEMEMTS
SECURED W^TH fJSHIMG UI^E WRAPPED SEVERAL TIMES THROUt^M BOOM AND AROUND ei_|ME NTS. THEN COVERED rtJTH EPOXY GUUE-
ATTftCM TO METAL MAST Oft TOWER WITH U-eOLTS
PHASIMC LINE 16 INCHES LONG MAOE OF TWIN LEAD AND SECURED WITH ELECTRICAL TAPE
TWINLEAD TO SHACK
Fig. 4. The finished product
Parts List
2 #12 copper wire— 81 inciies long
1 V X 1" wood— six feet Jong
2 1" X 1" wood— 20 inches Jong
2 PlexigJas™ for insulators— 1,5" x 3"— use the thickest type you can find.
Screws, nuts, and washers to mount the insulators and booms
Solder tugs and standoff insulators (if balanced line is used) U'boJts to mount center support to mast
The vertical eggbeater for two meters.
paint or spar varnish will do). Let me point out that it isn't necessary to use wood. One model of this antenna used PVC for the center support and cross booms. \ use ten Watts of power and have en- countered no problems. With higher power you may need to use the transmitting type of twinlead or open- wire line.
While the antenna won't outperform even a small
yagi, it doesn't require a rotor to aim the antenna; it has been a great improve- ment over the various ground planes and vertical dipoles Tve used in the past I haven't tried stacking the vertical eggbeater, but it should give some gain and a lower angle of radiation. Yotj've got to admit the price is right, so build one or even stack two or more, and enjoy. ■
RTTY TODAY
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Autliored by Dave Ingram, K4TWJ, a
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Chap. 1 The EJccttmg World of Amateur RTTY
Chap. 2 Operating Parameters and Concepts of RTTY
Chap. 3 Straight Talk on Home Com- puters and RTTY
Ctiap- 4 RTTY Systems for Home Com- puters
Chap, 5 RTTY Converters You Can Build
Chap- 6 Dedicated RTTY Terminals and Systen%a
Chap, 7 N ew IVI i n i-RTTY S y stems
Chap. B Fascinating RTTY Outside the Amateur Bands Press— Military —Weather, Etc,
Chap. 9 Frequency List of Commercial Press Services
Chap. 10 Secrecy and Other Codes Used in Radioteletype
Chap. 11 Tables of Abbreviations Used in RTTY
(^ See List of Advertisers on p^ge 98
73 Magazine * October, 1984 49
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ygi^ qrV in Duiitp^l.
Thin du:^M digih diirjcHjnr;!: v^kM Liirn ymjf lliilk!!, bn.t^t^d a[f
U&ing ^OUJ" progrpinifrirthli; Jir:<:^"s- crtriE
Df-t-iUled intkerlijcn rJijiyruini^ tfnd inmrugtigflj indvdaa
I plugs; In itCC iifn:1t€L|
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The Model 335A will deliver 35 watts of power using the latest state-of-the-art cir- cuitry. The amplifier will operate SSB or FM and is compatible with nriiost handheld trans- ceivers, including the TR2400, TR2500p IC-2AT, Yaesu, Santec, and Ten- Tec. Only 300 mw input will deliver 5 watts out; 3 watts in will deliver 35 watts out. Maximum input drive level is 5 watts.
Our products are backed by prompt fac- tory service and technical assistance. To become familiar with our other fine pro- ducts in the amateur radio market, call or write for our free product and small parts catalog
Model 335A
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264S NoTih Aragon Av^' Ddylon. Ohio4&'l20'if513) 3% 1411
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50 nnin. charge time - 450 Mah battery
ProgramaWe - 1 to 12 cells
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Repairs many shorted cells
Supplied w\ih univefSai EZ hook wtre leads
Control Products Unlimited, Inc. has responded to our proJessionaJ market by introducmg the Model QMS 403 Rapid Nicad Battery Charger and Conditionef.
C.P.U.'smany satislJedcustomers have Irom time to tEme made suggestions concerni rig exlra features that Ihey felt were desirable. These suggestions were compiled and our new product gicup weoi lo ^ork. impjementing these te-alyres in the cleanesi design ever. Our engineers t>gilt new and tsxc^tiny features into the advanced tirrje proven circuitry of our former GMS 401 and GMS 402 product Ime.
Specify Voltage and Mah of BattefV Pack(s) with order. One program module incEuded — optional modules $3.00 each.
S249.00 plus S4,00 Shipping (PA Residents add 5% sates tax)
IB
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50 73 Magazine * October, 1984
Give your ham friends tlie World!
^^^'h
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A subscription to 73 is a special holiday gift, a gift that lets readers communicate with the world.
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For hams everywhere, 73 has the most complete amateur radio information there is:
• Constmctiaii projects^-Thry're monev^savir^, practical, and easy to byildi and we have mcjre of them than any other ham mstgBzivc. * New prtiducts and reviews — 73 incroduces new products and evaluates them. To keep hains up-to-date with che latest technology. '73 International — Arnateur radio is worldwidel 73*5 international correspondents keep hams -everywhere informed of amateur radio happenings around the world • Ham Help — Fellow hams are the best source of help* Every months 73 publishes readers' requests for technical advice j compucer programs^ help in locating equipment and parts, and more. ' ■*
And 73 always has the latest on DXing» contests, satellites, and computers in the hamshack.
You can give a gift subscription to 73 for just $19,97* That's 20% off the basic subscription price. (Foreign
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64fim
/^.'Amateur Radio's Technical Joumal • PO Box 931 • Farmingdale, h4Y 11737
Free MFJ RTTY/ ASCII /CW software for VIC-20 or C-64 with purchase of MFJ-1224, MFJ-1225 or MFJ-1228 from MFJ. Send/receive Baudot, ASCII, CW. Type ahead buffer. 24 hour clock. Supports VIC printer. Menu Driven. MFJ-1224/1225 cable. On tape. Available separately for $29.95.
£J;**i?;«?sS;.'rf
■ ■A ■•;'^^ ^'KiC ji-".'--'--:^'^.
irrTY/Asai/ Imtqr/cw interface
FOR
'•20/ C-64 MFJ-122&
^MfeCUDES MFJ-1228, SOFTWARE OR TAPE AOO VlC-r2tt mom AND RIG TO ENJOY COMPUTER^
IZEO RTTY/ASCH/CW. OROEI! MFJ-122a/MFJ- 1264 FOR VJC^ai: MFJ-122B/MFJ-1265 FOR G-64.:
Most versatllt RTTY/. ASC»/AMTOR/C W Jntar ctrtfidge Mliable for V iC 20 and Commodore $4, Gim you more features, more perfofrtiance, more valua top your mgosy than any 0^ • cartridge available. ' " ' ;'
Safne tnttrftw wrtrldgft works for both ViC-20 and
Commodore 64. Plogs into user's port : ■
-■ Ctioo«« from wide varlt^ of RTTY/ASeil/CW,
even AMTGR SQttware. ^iot married to one onboard
software package Use MF^. kantronia. AEA plus
•;oWier software caftfidg&/^pe.ordisJc
860 Ki and TTO Hi shifts on receive i|td transmit. ; Hti tfiark and tp8M outputi tor s^pe tuning:
Nfirmatjfflfverte twitch eliminates retuniiig.
TniQ duil thannel mark and ipace acUvi IHtin and automatic thresnofd correction gives good copy when dne tone 1s obliterated by QRM or select)^ fading.
Eaty, poilj^vt tuning with twin LED Indicators. ;y:Nam»«^ Hi active CW filter. Automatic P^T^ - Exar 2206 sfrte generator for AFSK output, :: -SiHeidefl XtVR AFSK/PTT Interfwt caUa provide :ed: Piut or minus CW keyed output. FSK out.
Pewaraif liy ootnpittaf (few ma.}, no pomr adapter to buy or extra wfre to dangEe or pick up/radiate RFL
0{8step«xy PCS. Aluminum enclosure. 4y2x4ysiXl".
UNIVERSAL SWL RECEIVE ONLY COMPUTER INTERFACE FOR RTTY/ ASCII /AMTOR/CW
MFJ-12a5
$C0 95
69
h^. * P
* « *
^WfMVWri^iWf..^
TAPE AND CABU FDR VIC-H) OR C M.OROER WlFJ'lS2S/ MFJ-1264 FOR ViC-a OR fiftFJ-1225/MFJ-lZS5 FOR C-B4
Use your personal computer and communicatJons receiver to receive commercial, military and amateur RTTY/ASCII/AMTOR/CW traffic.
Plugi Mwvtn ra^lvar and VIC''20, Apple, TRS- 80C, Atari, TI-&9, Commodore 64 and most other personal computers. Requires appropriate software.
Use MFJ, Kantronics, AEA and other RTTY/ ASCI I /AMTOR/CW software.
Capiat ii^hlfti and iti ipatdtJwIn LED Indicators makes tuning easy, positive. Normal/Reverse switch eliminates tuning tor Inverted RTTY. Speal^er out lack. Includes cable to interface MFJ-1224 to VIC-20
UNIVERSAL RTTY/ASCII/AMTOR/ CW COMPUTER INTERFACE
Lets Y^u send and receive computerized RTTY/ASCII/AMTOR/CW. Copies alt shifts and all speeds. Copies on both mark and space. Sharp 8 poke active filter for 170 Hz shift and CW. Plugs between your rig and VIC-20, Apple, TRS-80C, Atari, TI-99, Commodore 64 or other personal computers. Uses MFJ, Kantronics, AEA software and other RTTY/CW software.
MFI BTTV^^W
#
*. .ny. , m. •« -- *»»« » rOMPUTER BtTEmFACE
S^
ytKh-^W^
WMII LOOti. CMtTA XKHt
• mm
■^tf
»;-^ ^ ^- , S-
JiL«iip ML.
m
M:S^Btl «*|'-*«is«
COMPLETE PACKAiSe INCLUDES MFJ.lS24,$0FrWWflE OS tape; CABLES. YOU NEED QHLV VIC-2&0B G-64 AND RIG TO £|UaY COM- PUTERIZEtJ RTTV/AScnyCW. 0ftfiifrttFJ-l224/MFJ'iaS4 FfllS IME^.
WMtzumMzm FOR C4L . .. ^:^"v:•;7;v^^;^^; :;vi:i-:tv:2:;:^:^
New MFJ-12Z4 RTTY/ASCII/AMTOR/CW Com- puter InterftCB lets you use your personal computer as a computerised full featured RTTY/ASCII/ AMTOR/CW station for sending and receiving. Plugs between rig and VIC-20, Apple. TRS-80C, Atari, Th99, Commodore 64 and most others.
Use fi/IFJ software tor VIC-20. Commodore 64 and Kantronics tor Apple, TRS-80C, Alan, TI-99 and most other software for RTTY/ASCII/AMTOR/CW.
€iiy, potltlvi tuning with twin LED Indicators.
Copy iny »hltt (170^425^S50 Hz and all ather shifts) and any speed (5-100 WPM RHY/CWand up to 300 baud ASCII).
CoplBt on both mirfc ind tp»a, not mark only or space only, to Improve copy under adverse conditions.
Sharp S pole 17D Hz thIft/CW acttve filter gives good copy under crowded, fading and weak signal conditions. Automatic noise llmlter suppress static crashes for t)etter copy.
Normtt/RflVBni iwlfch eliminates retunlng. -i-^ VDC loop output drives RTTY machine. Speaker jack.
MFJ-1224
Autemttlc tracking copies drifting signal.
Exir 22S$ line ganentor gives phase continuous AFSK tones, Standard 2125 Hi mark and 2295/2975 Hz space. Microphone line: AFSK out, AFSK ground, PTToutand PTT ground.
FSK keying output Plus and minus CW keying. CW transmit LED. External CW key jack,
Kantronlct compatible lOcket
Extluilve general purpoia lockit allows interfac- ing to nearly any personal computer with most appro- priate software. Available TTL lines: RTTY demod out, CW demod out. CW-l D Input, +5 VDC. ground. All signal lines are buffered and can be Inverted using an Internal DIP switch.
Use Galfo software with Apple, RAK with VIC-20, Kantronics with TRS-80C, TI-99, N4EU with TRS-80 III, IV. Some computers with some software may re- quire some external components.
Metal calimeL Brushed alum, front 8x1Vjx6 in, 12-15 VDC or 110VAC with adapter, MFJ-1312,$9.95.
MFJ-1223. S29.8i, R]^23l tdtpttr for MFJ-IW.
SUPER RTTY FILTER
CW INTERFACE CARTRIDGE
FOR VIC-20/ C-G4
MFJ-725
$ on 95
39
ffff
1ft***
Super RTTY
fIFter greatly improves copy under
crowded, fading and weak signal conditions. Improves any RTTY receiving system, a pole bandpass active filter for 170 Hz shift (2125/2295 Hz mark/space), 200 or 400 Hz bandwidths. Automatic noise llmlter. Audio in, speaker out jacks. On/off/t>ypass switch. "ON" LEO, 12 VDC or 110 VAC with optional AC adapter, MFJ-1312, $9,95. 3x4x1 inch aluminum cabinet.
or Commodore 64. 4^2x1 VixAV* Inches. 12-15 VDC or 110 VAC with optional adapter, MFJ-1312, $9,95.
HlghparfofmanceCW Intirfaci cartridge. Gives ^Q 95 ^^^li^ excellent performance
v9 MFJ-1226 under weak, crowded, noisy conditions. Works for both VIC-20 and Commodore 64. Plugs Into user's port.
4 polft lOD Hz bandwidtti actlvt flUtr. 600 Hz center frequency. 3 pole active lowpass post detection filter. Exclusive automatic tracking comparator.
Plut and rntnu* CW keying. Audio In, speaker out jacks. Powered by computer.
Includes Basic listing of CW transmit/receive pro- gram. Avattabte on cassette tape, MFJ-1252(VtC~20) or MFJ-1253(C'64),$4.95and on software cartridge. fvlFJ-1 254 (VIC-20) or MFJ-1 255 (C-64), $19.95. You can also use Kantronics, AEA ather software. Also copy RTTY with single tone detection.
ORDER A«Y PRODUCT FROM MFJ AND TRY tT-HO QBUQATION. IF NOT DELIGHTED, RETORK WITH- IN30DAYS FOR PROMPT REFUND (LESS SHIPPING)
• One year uncandltloital guarantee • Made In USA.
• Add $4,00 each shipping/handling * CillDrwrtta for frti catling , mf 100 pitiductt.
MFJ ENTERPRISES, INC. .-9 6ax 494, Mississippi State. MS 39762
|
TO ORDER Oft FDR YOUR NEAREST DEALER, CALL TOLL-FREE aO0-647'iaO0. ca i eoi 323 sees in Miss, and outside cont nental USA Tefex 53-4590 MFJ STKV |
^ff |
|
|
\^ |
||
52 73 Magazine • October, 1984
MTI VEBSA TVmJt B
tmtwmmA
''SmS?' Sg?8S
300 WATT ANTENNA TUNER HAS SWR/WATTMETER, ANTENNA SWITCH, BALUN. MATCHES VIRTUALLY EVERYTHING FROM 1.8 TO 30 MHz.
MFJ't fsitest sailing tuntr jitckt in pltnty of new t&alur»tl
• Mew Styling! B-^usned aluminum front. Ail metal cabinet
• Mew SWR/Wattmetif! More acctirate Switcli selectatHe 300/30 watt ranges Read forward/reftected p<]wer
• Mew Antenna Switch! From panel mounts. Select 2 eoax Hnes, direct or llirough tyncf , random wire/balanced line or tuner bypass for dymmy load.
y * Mew airwetintf (nductorf Larger more efticiefit 12 position air- w wOLfnd inductor gives lower losses and more watts out, Run up to 3CX) watts RF power output Matches everything from 1 B to 30 MHz: dipoles, inverted vea. random wires, verticals, mobile whfps. beams, balanced and coax lines. Burlt-in 4:1 balun for balanced lines. 1000V capacitor spacing. Bfack. 11)c3x? inches. Works with aH solid state or lube rigs, Easy to use, anywhere
mr
MOOiL Mf J.t4f0
«^«#!I.9U
MFJ-941D
NEW
FEA TURES
I
RTTY/ASCII/CW COMPUTER INTERFACE mfj.i224 $99.95
•.•5iy;.ffff. ^-J
-.^ I
Send ind rscslve compytflrfzid ^TTY/ASCJl/ CM witfi noarly tny personal contputflr (VIC'20. Apple, TRS-fiOC, Alan. 71-99. Commodore 64, etc ). Use Kantronics or most otfwr RTTY/CW software Copies both mark and space, any shift (including 170. 425. 850 Hz) and any speed (5-1Q0 WPM flTTY/CW. 300 baud ASCII). Sharp 3 pole active filter for CW and 170 Hi shm. Sends 170, 350 Hz shift. Normal/Reverse switch eliminates retuning. Automatic noise li miter. Kantronrcs cempatibfe socket plus exclusive generaJ purpose socicet. Bxr/ix6 in. 12-15 V DC or 110 VAC with adapter, MFJ'1312. $9,95.
RX NOISE BRIDGE
Maximize
your antenna
porfarmantal $59,95 mfj-202B Tells wheiher to shonen or iengthen antenna for minimum SWR, Measure resonant frequency, radiation resistance and reactance. New Featurei: individually caiibrated resistance scale, expanded capacitance range {t150 pf). Built-in range extender tor measurements be* yond scale readings MOO MHz, Comprehefisive manual Use 9 V battery. 2x4x4 in.
INDOORTUNEDACTIVE ANTENNA
"World Gribber^' hvilt or exceed! rMeptJen ol outtlde long wlrssf Unique tunad Active Antenna minimizes intermod, improves select- ivity, reduces noise outside tuned band, even functions as preselector with external antennas. Covers 0.3-30 MHz. Telescoping antenna. Tune. Band, Gain, On-off bypass controls, 6x2x6 i n. Uses 9V banery.9-18VDC or 110 VAC with adapter,
MFJ-1312, $9.95,
$79.95 MFJ1020
POLICE/FIRE/WEATHER 2M HANDHELD CONVERTER
Turn your tynthoiized scanning $39.95 2 meter handheld into a hot Police/ ^ • mFJ FIreyWeatlier band scanner! 144'14fi MHz handhelds receive PoNce/Fire on 154- 158 MHz wittT direct fre- quency readout Hear f^iOAA maritime coastal plus more on 160-164 MHz, Convener mounts t>etween tyndheld and rutiber ducky Feadthru allows simultaneous scanning of botli 2 meters and Pol ice/ Fire bands Mo missed calls. Crystal conirolfed Bypass/Oti switch allows transmitiing (up in 5 watts). Use AAA battery. 2y4KV/2%XV2 in. BNC connectors,
MFJ/BENCHERKEYER COMBO
MFJ-422
$104.95
The best of an CW worlds-
a deluxe MFJ Keyer in a compacfTonfiguration that fits right on tlie Bencher iambic paddle! MFJ Keyer - small in size, big in features. Curtis 8044'B IC, adjustable weight and tone, front panel volume and speed controls (B-50 WPM). Built- in dot -dash memories Speaker, sidetone, and piish button selection of semi-auiomatic/tune Of automatic modes. Solid state keying Bencher paddle is fuMy adjustable: heav^ steel base with non-skid f^t Uses 9 V battery or 110 VAC with optional adapter, MFJ-1305, $9 95.
VHF SWR/WATTMETER
L0WCl»t MFJ-812 S29.95
VHF SWR/
Wittmeteri Read SWR
(r4tOl70MHzj _
and forward/ I - - . * * If
reflected power
m. i
fff^
*•
fS
at 2 meters Has 30 and 300 v^atts scales. Also read relative field strength. 4x2x3 in.
.95
itfj "^'il!* I ?
1 KW DUMMY LOAD ^^,
MFJ-25Q $34
Tune up fait, extend
life of finals, reduce
QRM! Rated IKWCW
or 2KW ^£? for 10 min
utes. Haff rating 1or 20
minutes, continujus ai
200WCW. 400WPEP
VSWfl under 1.2 to 30
MHz. 15 to 300 MHz.
Oil contains no PCB
50 oftm non*indoctive resrsiof Safety vent
Carrying handle Th%^^ in,
24/12 HOUR CLOCK/ ID TIMER
MF4-103
S34J5
Sivitch to 24
tiour GMT or 12 hour format! Battery backup
maintains time during power outage. ID timer alerts every 9 minutes after reset. Switchable seconds readout. Elapsed timer. Just start clock from zero and note time of event up to 24 hours. Bright blue .6'' digits. Alarm with snooze function. Synchronizable with VWVV Lock function prevents mis-setting. Power out, alarm on indicators. Black. 5x2x3 in, 110 VAC. 60 Hz.
DUAL TUNABLE SSB/CW FILTER MFJ-762B $89.95
* "P3:53«
Dual flltars give unmatched performance! The primary filler lets you peak notct^ low pass or high pass with extra sleep skirts. Auxiliary fitter gives 70 db notcft. 40 H? peak. Both filters tune from 300 to 3000 Hz with variable bandwidth from 40 Hz to nearly flat. Constant output as bandwidth is varied; linear frequency control Switchable noise fimiter for impytse noise Simulated stereo sound for CW lets ears and mmd reject ORM inputs for 2 rigs. Ptugs into phone jack Two watts for speaker Off bypasses filter. 9-1S VDC or 110 VAC with optionaf adapter. MFJ-1312, $9.95.
ORDER ANY FROOilCT FROM MFJ AND TRY IT-NQ OBLIGATION. IF NOT DiUGHTED^ RETURN WITH- IN » DAYS FDR PROMPT REPyND (LESS SHIPPING)
• One year uiKondltlDfial guarantee • Made in USA.
• Add $4.00 each shtpping/lianritirvg • Ciller write tw Ine cell tog, over 100 pniducii.
f^FJ ENTERPRISES, INC. ^^ Box 494. MftilulppI Stite. f^S 39762
to ORDER QH FOR TOUR NEAREST DEALER. CALL TOLL-FREE
800-647 1800. Call 601 323 5869 in Miss, and outside continental tiSA Telex 53-4590 MFJ STKV
^ See L/sf ot A^v&r1istf$ cm p^g& 98
73 Magazf'ne • October, 1984 53
international)
Each month, 73 brings you ham-radfo news from around the world, in this coffection of re- ports from our foreign corre- spondents, we present the fat- BSt news in OX, contests, and events, as weft as keep you abreast of the technical achievements of hams in other countries.
li you woutd tike to coatnbufe to your country's column, write to your country's correspondent or to 73: Amateur Radioes Technical Journal, Pine Street, Peterborough NH 03468, USA Attn: Perry Donham KK2Y.
AUSTRALIA
44 Wwn Streoi AitQn& 301S Victoria Ausiraiia
Mo^t amateur? accept "plratai!"' aa a fact of life on the amataur bands, and 5ome pirates fiave eventually become well-known amateurs alter thay have real- ized what they are misafing by running un- licensed operations.
But when a well -organized pkate opera- tion si arts 10 put pressure on the powers thai be lor a slice of I he iwenty-metaf band lust above the amateur allocation, ypu start lo wonder what's gofng on, and why.
I am speaking, of courae, about that ev- er-growing band of yachtsmen and -wo- men who are usin§ amateur transceivers Instead o! (or with) their commercial gear. II has become so bad m the Pacific that they even have their own trequancies set up on twanty meters for rag-chewtng, with fiome of them uamg false callsigna for contacts within the amateur Ciands,
tl has cofrte to the stage Ihat the WIA and r^ZART ha\rt issued a joint atatemefit, with the t^ack^ng ot both ttie Australian and H&a Zealand Government Commurti- cadons Departments, eondefnn^ng this practice
Ttlftfe have tjeert many limes, ot course, that an^teur rad<o l^as come to I he aid of yachtsmefi in distress, and th^s may be one of the reasons why some are ^ying amateur geat as backup equipment tof Tt>eir boats. But if. as lound just recently in Austraria, they ate buying amateur geaf iii&tead of Ihe type ol approved ccHmmer- cial gear tttat they s^iould have on board, boeauae it is ctieaper. it is not only cents wise and dollar tooitsh bui downright dan^ gefotis, as amateur geftr is not designed fo« this type of opwat^on— sucn as being caugni In a howling gam and do^ng a cou- ple of 360-degfee loops with sail water fly ing evervwhem. OommerctaNypit, approved ysc^t radios are tiuilt (o star^ (his. bu) amaieur gear is not; that is why ifie com- mercial marine radios cost rnofe,
Hammm. as with any occupalkm of en-
54 73 Magazine * October, 1984
deavor, there is always the shady chai^ac- ter out to make a fast dollar regardless of I he risi< to ott^er people or the cost to the community.
One such unscruputous dealer in isievi South Wales (VK2y found a good market in selling general-covefage transceivers de- signed for amateur use (but also con- verted to cover yachting frequencies) 10 some memibefS oF the yachting fraternity at a lot cfMaper price^ due to an Import I9x of only 2% on this rype of ger>efal cover- age gear. This practice was soon noticed Uf a locat manufacturer of radios de- siipied for cominercial application, and he compiarrwd to the Government^ to protSd hjs own bysiness.
Tfve reason amateur gear drew an im- poit tariff of only 2^ a was mat there was no manufaciuref of amateur gear of this type in Atistraiia^ so it did not compete with lDc:ai firms. In this case it did, and the result was Mtat our govemrr»nl imme- diately put a 30% import duty on ait ama- leur transceivers being Imported into ttv^s country.
Or>e sure way to get ^nytXMly to sit up and take notice is to hit htm where it hurts, and with most people, rr>ctuding a ma leufB, that IS rn ttie hip pocket. Talking ail the extras mto account, the fmal price to the amateurs would have nsen around 45% Oh all imported transceivers.
On July G, 1983, the WiA. plus represent tatives of the major importers and distritl* utoi^s o1 annateur gear, a customs agent, and an editor of a locai commercial ama- teur-fadio publication heJd a meeting to seiek tacts and advice on how to handle this tariff rise. The WIA, after many sub- missions plus worit on their members' be-
half, came up with a solution agreeable to the government. The whole issoe hinged on 9 tariff bylaw that contained the words "without substantiaJ modification."
The submission to the government by the WIA was that ihey would set up a pinef of paid memt>ers who have a radio angJneer's background to lypo-appfove amaieur transceivers enterir^g this courv try and issue compliance certificates^ to enable retention of I tie 2% Impoit tariff for amateur gear.
As you can imagine, this was no easy decision by the WIA, on tiehalf of lis rnenv- befs, with a lot of on- and off-air discus- sions both fof and against ttvs WIA being involved in this type oi endeavor. How- ever, the WfA will remain impafttal at alt times tefardirvg any decision made by ttiis pNsnel. and will not only accept t>ut tiack its recommendations.
An excellent article tyf Bruce R Bathots VK34JV. the Federal President of the WIA, in the February. tgS4, Amateur Hadio (the official publication of the WIA) gives tfie definition oi what is required to cover the bylaw that states "witrvout substantial modification. " and expfair^ how lh& WIA arrived at the criteria needed^
Excerpts:
1. We recooniie that any piece of radio equipment can (» made to operate on any frequency providing tfve person attempt- ing the modification has the correct toots and equipment, and the knowledge of per- (ormlrtg same. As a yardstick in this re- gard, we ac^ipl that an amateur of at least ten years' standing would have the r>ecessary eKperience to analyze circuits ar>d equipment, and pert Of m art actual con version.
2. Therefore, a "Difficulty Factor" can be determined m conversions. An experi- enced amateur, as noted atwve. would be expected lo relate his efforts directly to the costs of the components required. lime, and effort. A monetary figure would have to t>e placed on the Lime element, therefore commercial costs of repair rates
and time would of necessity be applicable in this case.
3. As far as the WiA Is concerned, our only requirement is to detefmine in the "Amateur Sense/' what a substantial modification is. We are NOT corKerned with commercial conversions or sales out^ side the Amateur Servica. (We canriot stop them anyway. I A highly-experienced pro- fess iona J engineer would, no doubt, be able to convert any piece of equlpmant to be used on other t^ands in a very short time. As we are only responsible to the Amateur Servincer only normal amateur^ type methods fi\lt he used by our techni« cat committ^ in determining a cohver* s^on difficulty factor.
4. Ttie objective, therefore, is to estilv (ish wtmttmt or not a conversion by an ex- p^enced radio amateur is able to tw per- fomied at a rejaiively cheaper cost than the payment of the actual tariff duty on the FOB cost of ttw equipment urxfer con- sideration. A ratio between the^e costs can then tm determtned^
5,TfTe ratio (a "Dilficully Factor ratio! will enable the WIA to decide wheih»er or not a certain transceivef comes within 1 tie scope of {tie bylaw provisions. In this re- spect, only iranscslyers and transmitters designed for use try the Amaieur Sefvice and being imported try a recognijted retail er or deaier of amateur equlprrient will tx eligible iw a WIA evaluation. Bona fide travefters bri raging equipment into Austra^ lla pu refused from overseas for tlwlr own persona] use, witf also t>e at>ie to be in- cluded in the above.
It can be seen by the atjove just how much w€Kkt plus money, is involved by a national t>ody representing its rnembers in fighting repressive laws, whether they be added taxes, antenna-tower legisla- tion, or loss of amaieur frequencies This is why H is imperative that those amateurs who sit on the sidelines as nonmemt^rs of a united national amateur body rapre- sending ALL amateurs get their prioritl^ right or they could be peylng ah extra S800 lor a FTI-type transceiver — as we nearly were. A small annual subscription is Small price to pay to present a united front against anything detrimental to am- ateur radio.
How would It be If we all sat back and did nothing? I doubt If we would, with to- day's commercial pressure, have an ama^ teur-radio service.
Adilson mbeiro PYiAKM fleffA Paufo Maiavota PYIOZ ilABHE RJ Dtr^r&rl and Paulo f^o&eno Dommgos PY1ZT.
BRAZIL
Car!os Viaffrte Camein} PYtCC fli/a AtonsD Pena 4§. Apt. TO J 20270 Rro de Janeiro. fU BraiH
FlADtO AMATEURS OPEf^ATlHa THE HALF MARATHON
For first time in Brazil ^and we never tteafd aJXHjt this anywhere else t>etotei two radio amateurs joined the "Race of tr>e Bridge' ' and put il on ttie amatetir' radio air.
Ihe Race of tt>e Bridge is a yearty corrv petition, a cross-country "half rnarathon." orgianized by ttte CORJA (Rio de Janeiro ^rvners Associationf and sponsored by the Brad^conAtlantica Ofganteation, a bank and Insurance company helping arn- ateur sports.
This 22,4iX^m6ter4or\g race (a "t%alf maratt>orv" as It's Called h^ei} crosses the kmgesi concrete-bull! bf »doe in the world, The President Costa e Siiva Bridge, \4 ki- lomefters long, joining NIteroi City to Ftio
dfi Janeiro City. It b 75 meiers high at its highest point over wonderful Guanabara Bay, a dream scenary never to ba for* gotten.
Starting from The "Boat Station" in NU teroi and finishing at the f^odern Art Mu- seum, rigni Jn the heart of Rio de Janeiro City, \hh year'a Race oi The Bridge involved ^00 participants. There were 5 age caie- gofffts: IS to 19 years, 20 to 29, 30 to 39. 40 to 49, ar>d 50 /ears on.
Two 0nthuBl«3llc runners, Adi^son Rtbeira inriAKM ahd Paulo Roberto Do- mlngoe PYtZT, tMtHjght the ^de« to our radio amateur league^ LABR£ RJ (Rio de Jan^ro brafKh), and \l had the Immediate sppro^fal From Pauhs Maiavoti PYlOZ, SectJonal Director, so plans and action made it come true; e<]uipfrkent, land sup- port. an4 instructions were settled Ofi lo do the best.
Running together, sid« by side, ustn^ a poftab^e I02AT perfectly testod. with o^mplete^y charged batteries, operating by turns. Ad i I son and Paulo Roberto e«r> ried out this so-auco^aful operation, the first m Brazil!
Land-based siation PY1AA (LABRg FU official station} was responsible for all QSO appointments and QSL n^anaglng, runnefs Aditson and Paulo answering only to VHF contacts during the whole race.
PrDffnotion for the Race ot The Bridge among radio amateurs, trying to have more ot ttvem ai next year's race, and prch moticm for radio amateurism among ttie thousands of people accompanying the event, ar»d through p/ess and ma^jaztne publications, was the goal for this unusual initiative.
Of course runners could not worry about technical results, due (o equipment care, lack of concentration at the race^ and special attention to rad^o calls and lo base-controller Information, but final re- sults were very interesting. LABRE's sta- tjcn PY1AA, under control of Macial PYIZH, joined HF caffa to VHF, and many a EcngKJ I stance QSO was a 'W0W1" 3. PauJo, Parana, and Mines States were contacted, and even an "Air f^oblle" from a Boeing flying over Male Groaso. The Idea Is very promising tor years to come at the Races of The Bridge I
The race's scheduled time coincided with tl^e "Patrulha Verde Amarelo" Net (Green and Yellow Patrol), a sweeping 40-meter net covering all Brazilian states, so some very interesting Q&Ds were real- ized, now and then, as PYIZH joined 40 meters to VHP t As runners were using the PYtAA call, special Interest was raised due to the possibility of GSO points for ihe PY1AA On-The-AIr Award, sponsored by our LABRE RJ,
Well, we've read about races being de- scribed and accompanied by radio ams- ejrs from the outside, but coming from Ihe inside, from runners of the race them- iselves, it's really a lir^t time! Speciat awards were presented to Paulo Roberto and Adjison — and triey sure deserved ill
■■•■in
CYPRUS
Aris Kaponid0S SB4JE FOBox t723 Umassoi Cyprus
NEWS FflOli CYPRUS
Summertime in Cyprus usually mearm. for local radio amateurs, fewer voices on true air. Most arr^teurs over f^fe enjoy Ihe sea or the mount ains during their summef
Adtisoft and Psuia Bob&rto rt^SF tAe finisti fine in Paris Squam, Rio d9 JBrmiro^
holidays and the HF rigs are set asidOL Howavfif^ ttve VHF rigs ^re used quite a lot from the holiday or portable locations, hdosi of the 2m contacts are between lo- cal hama, but some OX is also done with 4X* or OD-lands. During the first week of June, a lot of e^rcitement was created by spOfadlic-E openings on 2m where a few &B4 DXers made contact with HA-, Y0-< and YU^Jands, A few of the lucky ones who managed to work on sporac^ic-E were 6B4MC, 6e4LP. 5B40K, 5B4MD. 5B4IT, 5B4IE» and 5e4JE.
Many interesting contacts can be made from central and westerrf Cyprus with SVS- and SV8- lands and some of the Greek islands In the Aegean Sea. Fellows talking sImpFex on £m with SVS and SV9 were 5B4JR, 564JX, 504JZ, and 6Q4MG in Paphos (western Cyprus), 3nd from the Nicosia area (central Cyprus) were 5B40A, 5&41E, 504MC, 5B4MD, 5B4LP. 5B4IT, and others.
A very interesting experiment was done successfully In Paphos by 5B4nJX, who constructed a VOX system whereby he can connect the R3 repeater in Heraklion In Crete with R5 in Cyprus, or the R4 re- peater in the Paphos area with R5, which Is on the highest mountain peai^ in Cyprus. In this way, amateurs in Crete. Rhodes, Santoilni^ and other Greek islands in the Aegean can be linked with Cyprus. Also contacts were made with amateurs in Athens (via this system) wfio could open the R3 repeater in Crete. II is hoped that ihe system will op<efate on a permanent basis during the summertinre. Many thanks to Sotos 5B4JX for this ser- vice on tKlialf ot aH amateurs in SV- and 5&4^and,
Recently an enthusiastic group of yourvg men passed their redio-amateur ex- aminations. Arnongst itKJse were some fiarTT>onics of wetl -known amateurs, such as the daughter of 5Q4JX. YL Florentia, the son of 5B4Elp lacovos, arxj my own aon. Georoe, age 16, wtto has tt>e cat I sign SB40V. We are sure that atl the newcofrv ers will do wefl and we welcome Itiem to ifiehoDlTy.
In Cyprus there are five active club sta- tions in Nicosia, Lamaca, Umassoi, and Papm^, TTiese ^t^ operated for Z to 3 houia pe< week. From what I know, not many people are operating trom there, tKJt
the ciub committees are trying their best to attract more young people to the club stations. An effort ^s made by CAl^ that this be a stage of practice arvd eitperience before the written radioamateur ex ami na- tron. Our club stations are still very poorly equipped, and any he^p coming locally or from ^£}road will be appreciated. Please send all donations to Cyprus Amateur Radio Society, PO Boj( 1267, Li mas sot, Cyprus,
CZECHOSLOVAKIA
Rudoif Karaba fOKSKFQ ARC} KomenskGhQ J 477 956 01 Topoic^ny Ciecnosfavakia
SATELirrE f1S« (RADIO SOVfTT 6)
MIchal 0K2axF from Brno was In- terested in satellites already as 0L6BDK, He established the first contact via the satellite RS6 on February 12, 1^84. with the transistor output of 5 Watts (Ihe tran- sistor exciter 200 mW and a power ampll^ tier with QQE 03/12) and with grounij plane and HB9CV antennas. The receiver antenna is a dipole and it Js on the recelv- ef rnput KFWieA. With such a transmitter, QRP— 5 Watts ERP, he established even 5 <^>ntacts durirvg the one orbit.
Accordmg to 0K3AU, there are further new stations on the RS satellite carriers These are the stations OK3LW and OK3WA0 from the region of East SloiwXta.
WINNERS FROM 1dft3 OK DX CONTEST
Top live stations worldwide and points earned:
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SfngleMuitJband |
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t22PP |
209664 |
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UA1DZ |
17B630 |
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UQ2GDQ |
1672Sa |
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OK2FD |
120175 |
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QIOZWA |
110545 |
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Single* |
-1.0 MHz |
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L22BE |
3700 |
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IJA3PFN |
2079 |
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UP2BLF |
2016 |
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Y38XO |
19^ |
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SJngte- |
-^3.5 MHk |
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HASBY |
8664 |
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HA6NL |
8625 |
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Y51XE |
7098 |
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UA3QBP |
6665 |
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UB5INQ |
eooo |
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Single- |
-7 MHz |
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LZ2SC |
2O01Q |
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LZ1GC |
1fi33€ |
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U1SS |
14950 |
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17PRS |
13606 |
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0K2BFN |
11544 |
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Sinsle- |
-14 MHz |
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yA9YAN |
2S105 |
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HA«MM |
S30SO |
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UHSEAA |
22152 |
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I2VXJ |
20490 |
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UA3IUK |
19136 |
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Single- |
-21 MHz |
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UAISAU |
14476 |
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UA3AMB |
1T136 |
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UA9MAF |
10955 |
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UW3UO |
105QQ |
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0K2B£W |
10430 |
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Single - |
-ZCMH^ |
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m&AKM |
2940 |
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UG6GAF |
* |
2310 |
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HA4XX |
z»s |
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RA9UA0 |
2072 |
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RA9SUV |
1872 |
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HuJtJ-O^rfBbawi |
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LZ2KZA |
1S57S0 |
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121 K02 |
178C»7 |
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UK2BBK |
1624^6 |
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OK1KRQ |
1570SO |
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HA5KDQ |
145636 |
^1^
1^
DL1YD
epB4
GREAT BRITAJhi
Jaff Maynard Q4EJA W Churehff^ids Wind&s WAS QRP Ch&shirB England
I was pleased to note that the recent D-Day Anniversary celebrations included a tribute to the role of the amateur in pro- viding operating skills and development expertise In the field of radio during World War II. As you no doubt saw in the teievi- sion coverage of the event, the beaches were visJied by The Queen and Prince Philip,
The latter is the patron of ihe R5GB and was the recipient olf a message of greeting originated by a 0-Oay special nevent sta- tion, GB40D, al the Lomk^n Air Traffic Control Center. RAF, West Drayton, and sent Id a French special station, FV6PAX. The received messBige, asking tt>e Prince to convey greetings from aJI radio ama- teurs to tffe assembled Heads of State, was handed by FV6PAX to the Mayor for on- ward transmission to ttfe Royal parry.
Sometime later. GS40D received a mee> sage, again via FV&PAX, from TT>e Queen expressing manks fcr the original mes- sage and wish ir>gi all ttie twst to all radio amateurs in ttie nations Involved, hteed- less to say, everyone cor¥cerr>ed with G84DD was delighted at ttie receipt of the rT>essage,
PRMCTKAL WiREi£SS
t will now digress somewhat from the general type of news ar>d information ttiat makes up ttie bulk of this column. This is because I have just come into possession
73 Magazine * October, 1984 S§
of three books receiiEly published In the UK of wNch two are dif&ctly related to am- ateur radio and Ihe third of wtiich will be useful In most sHacks. All ihre@ booh a are reprints of a number of ertlcles originally published ir\ Pracifcvi Wimiess, tt>e month- ty UK publication dealing with all aspects of radio (and not necessarily of direct in- leresi 10 active hams). TTie three books are lined Wims and Waras. tnimatjcing RTTY, arMf Are the Voitages Coff9cf}
Wires and Way^s is subtMleil "a gyide to antennas, accessor hes« and pfCfiaga- tlon" arxt contalrta no less than 42 articles In 160 pages. The lopics covered range frorrt theorv through antenna construction to swr bridge and other accessory cor** strucliofl This Is rrwitly a practical book, with the thoory section limited to only hvc itii!^S, of wtilch one is yag* de&kgn principles, anyway. The practical ctKtff- mg/i of the book it aimed at the trartsnnM- tlng ar>d receiving amateur alike ai^d corv cent rates on the co^structlqrial aspects of low-coat antennas for HF and VHF bend^. Most of th« designs use readUy- avajlat>ie Ai%si Ctmap matetials-
Most of the antennas lor const ruci Ion seem to be teased Ofi much practical ex- periem^e ar\d not just llwory. For example, a 2-n>eter beam Is dedcritied fw construe- lion from a broom nartdle. car tKaHe pipe, ar^ aluminum tutNng. Ir^ similar vein is the construction of a pseudo beam antenna suitable for Installation on lt>e balcony of a tiighfise apartment btoclK and based on two mob^te wtiip antennas and an inge- nious plxasirig aftangement
Accessories describ^id, In addition to the swt bridge already mentiorved. include an ATU. an audlbia field strength metef» and a couple of pfeannps togetfi^er witti aome note« on (nierferanca, suppfesslofl« and riltering, I found the low-pass SW-Hs- tefier filter parllcuiaftv useful and easy to reproduce-
Each construcllonsi article Includes a full Mat of components together wilh $ cost estimate (In pounds sterling, but yoit would, no doubt, find It Indicative) and a constructlor\ rating. This tatter guide Is Beginner, Intermediate, or Experienced. It's always nice to hav^e an indication of cost and compl entity before embarking on a project.
Wires and Wa^es Is aimilar to but com- plementary to ffte ARRL Antenna An- thoiogy,
I rnii8t cor^fess ar\ Interest before 6b- scrlbing introducing RTTY because it is based largely an a series of articles of the same name which I wrote a yeaf o^' two back and wtilch were seriaMzed in Prac- Ucai Wiratess. In addition 10 my articles iniroducir^g RTTY are some software and a number of equlpmeni reviews.
My original aim was to explain ttie tjacle- ground of RTTY and follow that with a cot- lection o( modules Ihat the reader coiild asseiTibte in any suitable configuration ha wished to form I he basia of his BTTY sia- HofL HTTY Is a form of data tfans mission b»ed on Mr. BaiMSot's S-unit code trans- mitted at 45.45 ttaud (60 wpmK Ttm Initial article illustrates the development of RTTY ligi^als (from terrestrial TTY) and shows tK>w FSK and AF5i( Signals are produced with modern transceivefS.
Rather ttian describe ■ complete lermi^ nal ur^it {TU), the remamir^ sections de- scribe a varieiY ot circuit building blocks wtiich may be put togettier as desired. Tbese include, for sxajTipie. interfaces be^ tween TTL ajnd ± 12 vo^ts and single^and doubl&HCLtrrefit 80 volts, filters, tOfte gerv orators jir>cloding a crysta^^cont rolled ver- sion), and irarioos demodulators,
Using these building iHocKs, ttte reader can put together a basic TU for reception onty Qt reception and transmission de- pending on his racruirements* Having
56 73 Magazine • October, 1984
whetted hi^ appetite, a more sophisticat- ed TU will no doubt follow (personally I now use Dovetron, which Is first class but e)( pensive^.
Ttie third of the PrscHcai Wiratass books is subtitled "a guide to fault-flnt^lng with yoijr mult I meter" and provides 44 pages of detailed theory afid practice re- garding cif cult- voltage measuremer^ts. Basic prjniciples are explained from sim- ple voltage dividers through the effects of meter fesistancfi to the influence of in<tuc- tance and capacitarvce ^n ac circuits.
The reaJ benefit of the book, ttioijgh. conies with tf>e sections on applYing a Tnultlmeter to fault-ffnding in real circuits. A$, fc>r example, a number of popular railJO circuits are discussed wilh the voll- aoes one can expect in ixHh wocking and failed equipment.
The tfires books are obtainable directly from the publishers: IPC Magazines Ltd,, Westover House, West Quay Road, Poole. Dorset BHt& UG, Er>9t^id. Prices (irvcJud- ing airmail postage) are: Wirws and Wive5— S6-2Z; Introdi/cing RTTY— $2.13; and Are tfte Voitag&s Correcf?— $306,
Alrrttaii sut^criptions to Practical W/rp- fess magazme are S40.00 per annum (12 Issues), AU conversions are at S't,40 to each pound stealing.
OrKe aga>n I mu^t say that aitt^iougtr I love to hear from re^jers, please do not write to me atxxit th^^e tKXJks. i have no easy means of shipping them, so please contact the publist>ers directly.
ISFIAEL
fton Gang 4Z4MK
Kibbutz Ufim
Negav Mobffe Post Office BS5^
fsraet
PfiOPAGATlON As these lines are being written, the
long hot summer Is upon us. VHP condi- tions vary from good to excellent with the typical eastern Mediterranean tropo- spheric ducting laciiitaMng dally two- meter contacts between Is^^el and Cy- prus and sornetlmes the Greek islands. On HF. ten meters Is all but dead, but twenty meters Is the star with the band wide open to Korth America during the late night ptus long path propagation to AusiraliaJNew Zealand ^n the early morn- ing. Fir teen meters often comes alive at night with openir^ to North and South Arrterica, altho^h generally to certain areas a^or^e arx) not wlctenopen condi- tions.
MOUNT CARMEL RTTY REPEATER
The riewrest addlHon to ttve chain of re- pMltrs in Israel, WAfQMJAX HPl, was ac- tivated In the spring. Located on Mt. Oar- mel overlookir^ the Mediiefrariean Sea from a height of 350 metats. this repeater ts a unique phenofnenon in out reigion pre- aenllrvg the amateurs with almost endless poi^ibilities for use. It was built, shipped over, set up, and dk>nated to the tsiael Am- atetjr Radio Club by Ed Wobb W4FQM. It is a near duplicate of a machme built ajxl operated by E.d In Florida, and the nams hata are lust beginnirvg 10 discover its vari- ous uses.
The Ir^MJt frequerkcy k% t44J0Q, the cod- ing frequency lor radiotetetype in lARU Region One. The output frequervcy is 145-300. making the repeater compatible with standard twOHnetef gear using a QOCMcH£ spilt. Maik frequency is 2125 H2 and space Is 2295 Hz. To activate the re- peater, you must trequency-imodulate your siginal with the mark frequency for two seconds, and the repeater will open, leaving a talt of 15 seconds at the end ot each transmission. Should the repeater fall, you reactivate it with the mark fre- quency.
In the RTTY mode, the machine does not operate as a typical FM repealer. Rather, It digitally encodes the signal r^ calved and reconstitutes 11 with a vastly- Improved sjgnahlo-noise ratio- Thus^ a
Aon Qang 4Z4Mit
RTTY signal under the noise and not clear to the human ear la turned into a clean, readable signal making possible solid long-range contacts where ail else might falL
Technically speaking, the heart of the repeater is a 20'Watf Hamtronlcs unit with a 70'WatL amplifier, with a Wacom duplex- ef consisting of four cavities ahea4 of the antenna. At the tfme oi writing, the repeat- er also functions on standard FM, ai^ though a transmission of the martt fre^ quency will shift it over to the RTTY SKClu- sive mode, so thai the machine may tM used on voice on a secor^ry basis. From my QTH. 200 km south of Mt. Carmel, I htave succeef^ed under ducting conditions to make contact through the machine us- m<g an indoor hand-held hg with its rubtMr^ duckie antenna. This testifies for me su- perti sensitivity of this repeateff
Lately, Israel 4X4UF has begun trans- mitting a nightly bulletin at 10:00 pin local time, on RTTY. of course The bulletin is a sumn^ary of the weekly HaQat Oft tfm Air, I ARC news magazine, edited by 424 RM arvl 4X4UF. It consists of tocal and mter- national amateur new$, buyers' ar\d salt- ers' announcements, technical news. elc. Tlie bullelln is updated every Wednesday, and Israel will uansmU it at other t^mes uiiofi request.
Reportedly. Ed W4FOM Is tmilding a mailbox for trte storage and retrieval of m^sages on If^ repeal ef With the proltl- aiatton of home computers and amateurs using them to get on radloteletype, inter- asi Is running higri We are all grateful to Ed For his gilt, and without doubt It has al- ready made a great coniribullon to the technical advancement of Israeli ama- teurs. Amateurs in the Mediterranean basin are Invited to try to work through the repeater, and it will tie interesting to see what kind of DX will be possible.
Q&CAR MEWS
Ya'lr 4X4GI reports that at this time there are five Israeli stations making con^ tact through the OSCAR 10 satellite: 4X4FQ. 4X4GI, 4X41 K. 4X4MH, and 4Z4Aa Ya'lr has contacted stations in Hawaii, New Hebrides, and other "rare" Islands In the Pacific through the blrd^ accomplish- ments normally quite difficult from tiere on the HF bends.
Steve 4X6MF, who by the time you are reading this should be active on the satel* lite along with the other new Israeli ste- tions, is beginning to organize a local chapter of AM SAT. Reports are that there are more satellites in the offing, and with the decreasing suns pots and poorer HF conditions. Interest Is mounting In the country in satellite communications.
IhilERFERENCE ON TWO METEBS
II is a well-known fact that the Iwo-me- ter transceivers manufactured for ama- teurs sell for a fraction ol tfie price of sets produced for the commercial two-way radio market. For this reason, many clarv destlr>e organizations around tfve world use amateur gear for their nefarious pur- poses, and certain dealefs are more thiart happy at thi^s opportunity to turn a profit. rKi questions asketl
For many years, until the PLO terrorists wei^ expeifed from Soutbefii Labanon In June. 1982. two rneters In Nortt^efn tsfa«i especJaiiy was plagued by interlefenca from ttiese quasi-military groups. Espe^ cialty hard hit was ttie Haifa repeater, with lis input Frequency of 145.000 Mhiz appar- ently b»e4ng a calling rrequer^cy for Itme outtits. As a result, a tone access was added to the rBf»ater to prevent its being triggered by non-amateur signals. This feature was deleted after the 1982 war ti* lericed the source of this QRM.
Two-meter non-amateur actively is
WHAT THE COMPETITION CALLS "NO LOST WORDS OR SYLLABLES"
WE CALL NOISE
THE COMPETITION: "HI HONEY I(^S^st)M FIXING YOUR (^S'/IDVORITE SUPPEef,) BARBECUE HAMBKf^)GERS. THEY WIKf^) BE READY AT 6:^^,) WILL YOU MA(no!se) IT IN TIME?(Kst)"
Samples (heard as bursts of noise) displace your phone party's audio for as long as it takes your transceiver to T/R. The above exanriple assumes a transceiver T/R time of about 150 mS (typical)
PRIVATE PATCH II
it
HI HONEY 1 AM FIXING YOUR FAVORITE SUPPER. . .BARBECUE
HAMBURGERS. THEY WILL BE READY AT 6:30. WILL YOU MAKE IT IN TIME?"
Thousands of PRIVATE PATCH II owners are enjoying the commercial communications quality that only a VOX based, simplex autopatch can deliver.
PRIVATE PATCH II IS PRICED AT LESS THAN HALF OF OUR COMPETITORS "FAVORITE COMMERCIAL SIMPLEX VOX PATCH"
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PRIVATE PATCH U requires only three connections to your radio (MiC, PTT and SPKR audio). If these connections are made inside your radio PRIVATE PATCH II does not interfere with the normal use of your radio. Otherwise for a quick and easy interface you may plug PRIVATE PATCH II Into the MIC and SPKR jacks. A 10 minute job! Unlike sampling patches, connections are not required to the squelch, discriminator or power. And best of all, modifications are never required.
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The sampling process reduces the effective range of your base radio. This is because if a sample, and a signal fade coincide, the sampling patch thinks the mobile is not transmitting. This causes a sampling patch to become erratic at ranges still very useable by PRIVATE PATCH II. PRIVATE PATCH II will not diminish the range of your system.
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7$ Magazine • October, 1984 57
mn
asain on the rise in Lebanon by the vari- ous organizations operating there. Now with the suinmer ut>on us and long-range tropospheric^ propagation present, these stations are be^ng heard all across the two-meter band. This time, strangely enough, the main victims are the repeat- ers in Cyprus J especialEy on R2 and R5. At some times of the day. say our Cypriot oounterparts, these repeaters become vir- luaily Unusable because of the clandes- tine operations on their input frequencies. This time, no Immediate solution Is In ^jght. This curiosity Is simply one of the by-producls of polittoal instabllty In our area, and we'll have to le^rn to live with it.
LIBERIA
Brother Donard SWtf^s. C.S.C.
EL2AUWB8HFY
Brothers of ti^G Hoiy Cross
St. Patrick High Scttoot
PO Box 1005
Monrovia
Hepubiic of Ut&m
CQ NO PROBLEM IN LIBERIA
Our amateurs are aware of the evils as- sociated with CB radio and are determined that it wilt not get out of hand here. It is legal, but at the present time a CB license is very difficult to obtain. There are those who want Xq get on the air without doing ail the work of learning the code or of passing theory tests. They are working at it here as they are in the US and other places. To date they are losing the battle.
in the commercial broadcast band there Is a lot of empty space. We have only three stations. One is really commercial and the other two are mission stations which are commercially licensed but which exES^t primarily to bring the good news of the gospel to the people they can reach. With all this empty airspace, the Li- t>eria Radio Amateur Association has the bright idea of obtaining a spot on whEch to broadcast code much as is done by WtAW. It is not practical to do that on the amateur bands because so many of the people for whom this service is intended do not have and will not easily get an ama- teur radio. The Association has been worsting on this idea for more than a year. Things move sfowly In Liberia.
In Holland, there Is a great problem of unlicensed broadcasting to and for the general public on the regular commercial bands. The problem is completel^y out of control, much as is CB In the States. Some of our outlying mission stations are looking at that situation with interest. In one case it has gone beyond the looking stage and there is a five- or ten-Watt stereo station jn operation. Everyone is happy. The station operates three or four hours a day with music and news reports and is the only thing that is available to that community. This littie station, though not tormally licensed, operates with the Knowledge and consent of the Ministry of Tel ecom mun I oat Eons.
Another misslor^ station Is considering the possibility of a like operation. This is very interesting, and from where we sit tt seems that there is nothing to lose and ev erything to gain. Certainly the people In those outiyjng communities appreciate what is being done. It is a credit to the Ministry that I hey do make an exception In this instance, and so long as these littie outpost stations operate with proper au- thorization, there is little likelihood that things will get out of controk
That IS a little aside. The immediate probiem is that everyone wants to take a shortcut into the world of amateur radio. "No-code licensing," CB space in the am- aieur bands, just anything to get in with- out dotng the work. Over and over again we find that I he results are counter-pro- ductive, Japan has no-code licensing. For an evaluation of the result read 73^ Au- gust, 1983, page 73, The amateurs must be alert and they must make every effort to preserve the great hobby that is theirs. In the States they have won another round, and that Is ati that it is— another round. See 73, March, 1984, page 104. When the amateurs gfve In or simply lose the fight, amateur radio as we know it will just fade away.
In Liberia, the 1=ladlo Amateur Associa- tion works very closely with the Ministry of Post and Telecommunications, which is the department of government under whose Jurisdiction amateur radio oper- ates. The Ministry scans the amateur bands and checi^s for vioiators. The ama- teurs themselves do the same in a some- what less organized b^ut nonetheless ef- fective way.
Amateurs In Liberia do folEow the rules and they take pride in maintaining a high standard of courtesy and technical effi- ciency. The same can be said of most of the amateurs of the world, but not aiL I, as an outsider living in Liberia, am impressed, } think it is a great credit to this I Ittle coun- try, and as amateurs around the world make their contacts with Liberia, they will meet with courtesy and respect.
^\^ ^1^
MONTSERRAT
Errof *'Bobbi&" Martin VP2M0
POBox U3
Piymouth
Montserrat
Bfitfsh West fftdies
SCANNING FROM MARS
Well it's the official Annual Hurricane Season once more in the Caribbean area. This comes Into effect on June 1st each year, and with 22 hurricane names listed for this season. It's small wonder that am- ateurradio operators throughout the re- gion are keeping a watchful eye on weath- er conditions as a measure of disaster preparedness-
The Island of Mont serrate a British colo- ny located in the eastern Caribbean about 268 miles southeast of Puerto Rico and only 39-1/2 miles square, has |ust held a three-day Pisaster Preparedness and Emergency Management Workshop. This was jolntiy sponsored by the PanCarlb- bean Disaster Preparedness and Preven- tion Project Commit lee (PCDPPP) and the government of Montserrat. which was de- signed to correlate plans and actions to be taken by the variou'S groups and organi- zations that are usually involved in the education and protection of the general public in times of national emergencies and disasters.
This workshop was held at the Govern- ment Training Center iocated In Ply- mouth, the capital, beginning on Wednes- day, June 20, and ending on Friday, June 22. Lecturers were Mr, Jerome Lloyd- Consultant, PCDPPP, Dr. Oeryck W^ He Inemann— Project Manager, PCDPPP, Lt. Col. Gtenn A. M I gnon— Disaster Pre- paredness Advisor {UNOFIO), PCDPPP Course Director and Miss Eizabeth Twlnch^Brittsh Red Cross Advisor, PCDPPP.
The workshop was attended by senior officials of the EKecutive Committee (Di- saster), officials of government, statutory boards and companies^ and voluntary or- ganizations, also district and deputy chairmen, Some of the topics discussed at the workshop were:
• Preparing the community for disasters
• Role of the security forces in a disaster
• Role of the Red Cross during these times
• Roie of communications, with a pre- sentation given by the president of the Montserrat Amateur Radio Society, and role of the media
• Role and functions of the disaster man- agement organisations
• Managing mass casualties
Many other aspects of disaster and emergency preparedness were covered, all of which incorporated the use of radio communications for efficiency because of the terrain of the island. Thus the Mont- serrat Amateur Radio Society pSays a vital roie as the organization most readily equipped to provide this service.
As previously stated {see 73, May, 1984), the Montserrat Amateur Radio Society has a team of operators assigned the task of manning various police stations, the airport, the hospital, and the local govern- ment public broadcasting station {ZJB), thereby providing a continuous link with the Central Control which is located wittv in the confines of the Piymouth Police {Headquarters.
In addition to these stations, v^hich will be operating via the 2-meter repeater (but with capabilities of reliable simplex oper- ation}, there are at least tvi^o additional stations delegated to operate on the Hf bands with the objective of maintaining contact with the outside world in the event that all other means of communica- tions become unavailabie.
T^ese stations are readily equipped with standby generators, batter I eSj dl- poles, and verticals should the main an- tennas be lost in the expected gale-force winds usual with hurricanes. These are the stations of Dr. Konrad Hollati VP2MF and VP2MO; the iatter will be operated by Mae Martin VP2MN. Both these stations were very active during the 1979 Dominica crisis caused by Hurricane David and pro- vided the necessary Information to one of our local radio stations {Radio Antiiies, a 200,OOOWatt system that covers the en- tire Caribbean Area and beyond) and the Government Broadcast Station which covers the neighboring islands.
At this time, as has been the practice of the past years, all memtaers of the Mont- serrat Amateur Radio Society's Disaster Team are maintaining a close link with each other just in case. . .
On the HF band, the designated stand- by, weather watch, and coordinating fre- quencies for the Caribbean area are the same as those of the Antilles Emergency and Weather Net. These frequencies are 3-815 MHz in the evenings and mornings and 7. 168 MHz during the day.
This net operates twice daily, 365 days a year at 1030Z and 2230Z, normally on 3.S15 MHz, and reverts to the 40-meter band only for exercises or in times of disasters. During normal nonemergency times, the net operates as follows.
Two Islands are responsible to provide NCOS on a vifeekly rotational basis, one Island doing the morning session and the other the evening session. There Is a roll call for isiand^y-island check-ins, begin- ning with Venezuela In the far south to Jamaica and beyond in the north.
Weather fnformation is provided from the Netherland Antilles, Trinidad and Tobago, Barbados, the French AntilleSi Antigua and Barbuda, and The US Virgin Isiands, obtained from their respective
net offices, thus providing a concise weather picture throughout the Caribbean
area.
The Montserrat Amateur Radio Society recently met for its annual generai meet- ing, during which the foi lowing officers were elected for a term of one year. Presi- dent: Errol "Bobble" Martin VP2MO. Vice- president: Sydney St. C. Meade VpaMC, Secretaryrrreasurer; Mrs. Ursula Sadler VP2MDY, Equipment Officer Victor James VP2MQ, Activities Manager: Tony G laser VP2MIK, and Executive Member-at* Large: Dr. Vernon Buffonge VP2MV.
The following persons have been reap- pointed to these respective positions: Awards Manager: Errol "Bobbie'* Martin VP2M0, and QSi_ Manager: Mr. Qene Ege, Sr. WB2LCH.
Please note that Gene W82LCH Is QSL Manager for these stations on Montserrat oniyi VP2M (Speclai Events Station), VP2MN iJoanna "Mae" Martin), VP2M0 (Errol "Bobbie ■ Martin), and VP2MLD (Law- ton Daley). All other QSL cards should be sent to their respective owners and not to WB2LCH.
QSL PROBLEIilS
One of the ma|or problems that the Society (a^c^ VP2M0) is faced with is that of being used as a QSL Bureau, and aa? such we are being clobbered with cards from all over the globe. The strangest part of it is the tact that cards are coming here for countries as far away as J2CB and the rest of the Caribbean area.
Please be informed that no QSL Bureau exists on Montsen'at, for we are not equipped to handle this service — neither finan- cially or otherwise. This matter is of t times discussed at our club meetings, and the only persons being catered to by the Society are its members and others who have made the proper arrangements with the Society. Please aiso note that the more active resider^t operators here each have a QSL Manager, and anyone needing a response should utilize the managers' services as much as possible, unless the operator states otherwise. TTtis method would make things much better for all concerned.
Guest operators usually give their re^ spectlve QSL route, and one has only to listen. Another situation which exists and needs to be rectified is the direct QSLer. These fall into three basic categories: (t}An enclosed SAE wfith return postage, (2) An enclosed SAE with no enclosed postage (sometimes no enclosed enve- lope), and (3) a QSL card, stamped, mailed with a request PS£ QSL TNX.
My response to these types are as follows:
The first person does the proper thing^ for even if the enclosed postage is inade^ quate, he deserves an Immediate re- sponse with a card via first-class mail.
The second type of person has got to rs* ali^e that ttre OX station must have worked many stations, thus if he were to send a card to everyone without the necessary postage, he would not be able to slay on the air for very long, and even were he to be able to respond to 50%, who would deserve to be that lucky half?
Fiegarding type 3, 1 think that anyone who would pay (?) to have his cards printed and then )gst throw them Into the mails caring nothing about defacing his cailsign and any other Info that was so carefully put together doesn't deserve one of mine, for to me a QSL card represents something, so I thtnh that that kind of per- son has no respect for his card, his call, nor the operator at the other end, for why do they maite envelopes anyway? Proud of your call? Proud of your card? Then prove It!
Until we meet again, my feliow hams
56 73 Magazine • October, 1984
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105
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out there^ Ifs always very pleasant to mset operators {VP2MO) saying catch me on RTTY daily from about 1700Zon or near 14.084 MHz, and it you're lucky you might even run Into Joe VP2MJL or Tony VP2MIX, and very soon, too, "Doc" VP2MF.
73 and gud DX a& I'M be scanning from iVIARS,
NEW ZEALAND
D. J. {D&sj Chapman ZL2VR 459 Kennedy Road Napier New Zealand
This month \ shafi give readers a couple of examples of the close liaison between the ZL regulatory body, the New Zealarhd Post Office, and NZART, our amateur- radio national association.
In 1982. the HZPO decFded to conduct a review of the Amateur Service as a whole in view of changes it had observed in other countries and because of submissions from isiZART. The last major chartQe to the ArnateuT Service was fn the mid-60& when the Grade Hi Technician class was intro- duced. Since that date only minor changes have been introduced with the in- troduction oftiie New Zeatand Radio Reg- ulation-s 1970 (an update on the previous radio regu tat ions),
Accordingly, N2ART was invited to put forward submissions for a review of the Amateur Service as a v^^hole Vifhich could be considered in conjunction wi;th changes the Post Office l-tseif saw as be- i;ng advantageous. Gerterally, the propos- als submitted had to confofm wfth the conditions laid down by the International Radio Regulations.
In response to the invitation, our asso- clatfon, after several top-level discus- sions, submitted a 37'page doc u mem, and some discussion on the proposals took place between the Post Office and a team of NZART council m ember S-
Tlie Post Office then drew up a paper on the outline of a proposed structure for the Amateur Service tn ZL, which Included a number of proposals from remits placed before the Post Office by M2ART from an- nual conferences over a period of time, This "paper" was then distributed to all ZL licensed amateur operators, who were given the opportunity to comment on the proposals before the regulations were amended or changed to give effect to any or all of proposed changes. At the same time, the Post Office asked all amateurs for suggestions other than those put tor- ward in the paper, provided such sugges- tions conformed with the general parame- ters for the Amateur Service as laid down In the International Radio Regulations.
It Is the Intent ot the Post Office that, within those constratnts, ihe conditions under which the Amateur Service In New Zealand operates reflect the wishes of the majority of the users. It is Interesting to note here that the submissions were made by MZART on behalf of its members as the 'Voice" for the Amateur Service In ZL, but the Post Office saw tit to circular- ize ALL amateurs and allow them to indi- vidually suggest changes, thus providing for the 27 V& of licensed amateurs who are not association members to be heard on this Important subjecK
A summary of the proposals follow/s; readers are reminded thai the changes are only suggested at this stage, but as they are the result of joint consultation, it
60 73 Magazine • October, 1984
Is probable the final draft wFII be very
similar to the foHowEng,
Qualifications: 3 levels of qualified op- erators: Novice, IMon-Morse, and General. (The littles are merely descriptive at this stage.)
Entry may tae made at any one of the lev- els, and the Novice grade will tie non 'ter- minating. It will be possible to hold botii the Novice grade and Non-Morse grade of (^uaiification simultaneoiJSly-
The Non-Morse grade is unchanged from the present Grade III, and the Gener- al grade will replace the existing Grade il and Grade I certificates.
Examinations: Examinations will be held twice yearly and wiH consist of a writ- ten examination in two parts, a technical paper and a regulations and procedures paper. (Basically the same as at present.) The Morse test will remain an essential part of the Novice and General qualifica- tion, examinations, the scope of the test being widened to include a Knowledge of figures and common punctuation marks. It will be possible to obtain a partial pass, but credits for part passes will remain valid only for two further scheduled exam- ination dates-
Privileges: The General qualification will attract the privileges currently granted to the hoEders of Grade i certifi- cates, e.g., ail bands, all modes. The Non- Morse qualification will have the same privileges as are currently available to Grade III certificate holders, e.g,, 27.12 MHz, 51-53 MHz, and all bands above 144 MHz,
The Novice qualification will be non ter- minating, l,e,| it may be held indefinitely with- out a need to upgrade, and will carry the following special conditions and freguen- cies: Power restricted to 10 Watts do input to the final rf stage, and operations re- stricted to CW and AM {including $SB) in the bands 3525-3575 KHz and 2110O- 21200 kHz,
Log keeping: Consideration will be given to waive the recfuirement that ama- teur operators keep a station log in accor- dance with regulation 53. However, ama- teurs will be encouraged to Keep a log, recognizing that the document plays an Important part in some amateur activities.
These proposals were sent to ail ama- teurs in ZL In April this year, and we had until May 31st to forward our submissions to the Post Office. On that date, several hundred amateurs had taKen the opportu- nity to reply to the Post Office on the paper, and to this date there have not been many ob|ections to the document, in the main. We now await the decision of our regulatory body with Interest.
The second example ot cooperation and liaison res u fled from two remits passed at our recent annual conference in early June this year In Just under one month from the date of the passing of the resolu- tions, the Post Office implemented both proposals. They concern visiting ama- teurs and our Grade II! certificate holders.
The ZLO visitors" call holders will not have to suffix their ZLO call with their home call sign as was required previously; now visiting hams will not have such an awfuf mouthful to say when working on the bands here in ZL, they will merely use their aMotle<i ZL® callsign. The otiier remit requested the Post Office to permit Grade III operators to use CW on their allotted frequencies. Previously, Grade III could not use the CW mode but were permitted to use all other modes.
mT& 'N' PIECES
Sllenl Keys recorded recently were D. {Dan) McMahon, ex ZL1CIVI, aged 88 years, a respected, retired Auckland Radio In- spector and long-time amateur and
marine operator; and M. H. (Mark) Chyrton
ZL1T3, another old-timer and well-re- spected amateur operator we li -Known to many overseas hams.
Old -Timers Club 50 year certificates were recently presented to R. A. {Ray) An- derson ZL3JV and T. E. (Tom) Rowlands ZL3iX, and 60-year certificates went to T. R. (Tom) Glarkson ZL.2AZ, ex ZL2AR and ZL1F0, and H. N, (Nev) Shrimpton ZL2AUM. ex ZL4AO and ZL2BJ. Congratulations to these operators for their long and active career in amateur radio.
Over recent columns I have been report- ing on ZL offshore islands and their re- spective amateur activities. This month i shall briefly tell you about another ZL off- shore island, but unfortunately the ama- teur activity would noi have been of any use to overseas amateurs as the operator was confined to VHF activities.
Snares Islands, a small group of unin- habited islands 209 i<m southwest of Bluff (the southernmost port of ZL) at 48*3 166^36'E. were discovered independently on the same day. November 23, 1791, by Vancouver in the Di^covefy, and B rough- ton in the Chatham. The group covers an area of approximately 360 hectares and consists of coarse granite with a covering of peaty soil. The soil is densely vege- tated, mainly by tupari (Olearia lyallli}, which creates an almost closed canopy to 6 meters high.
The Snares Islands are administered as a nature reserve under the Reserves Act by the Lands and Survey Dept., and entry is by permit only. This is due to the absence of introduced mammals and vir- tually unchanged vegetation and animal life. Their pristine state gives these Islands world recognition as important sanctuaries.
During the three-month period Decem- ber, 1983, to February, 1964, P, J. Wilson ZL3TJD/A, ZL9TJ0 operated an amateur station on VHF from Snares Island. He op- erated on 2 and 6m with an Icom 260A into a 10 element yagi, and an Icom 505 into a 5-element yagi. Both rigs were powered by gel batteries, ciiarged using a Honda generator.
Contacts on 6 during the three-month period included VKs 1, 2, 3, 5, and 7, and ZLs 1,2, and 3, and ZL70Y; Chathams was heard, but unfortunately not worked; 2m contacts through repeaters at JnvercargitI and QueenStown were made as were five simplex contacts with ZL4 stations from the high part of the island. Signpost HiiJ, B2m above sea level.
The trip to Snares Islands was made by a University of Canterbury field party, ZL3TJ0 being employed as a technician to assist with the penguin census and banding, as well as with some entomolog- ical collecting;. The visit was made possi- ble through a research grant provided by the Lands and Survey Department. (Infor- mation for this item was supplied through the courtesy of Break-in, the NZART montfv ly official journal.)
The 24-GH2 record for ZLs was broken on April 7, 1984, when Tony ZLIBHX and Russeli ZL1BQK extended the communi- cation distance to 33 km, In the Ninety Mile Beach area in the North Auckland area. They used 25-mW Gunplexers^^^ in- to 17-dB gain horns and 30-iMH2 home^ brew (DJ7O0-deslgned) i-fs. Their report states the first contact was from Ah i para Lookout to Hakatere Forestry Observa- tion Post Then once they had established contact, Tony 2L1BHX moved up the beach, but after the distance was extended further, the salt-spray haze increased and copy was in and out quite rapidly^ so they decided to quit while still ahead of the old record.
A "contest with a difference" Is held an- nually in ZL that always causes a lot of laughs — It is the QLF activity, this year
held on Wednesday, August 15, 080OZ to 100OZ. Its main object was to have a pack et of fun on SO meters. The rules are very simple, the execution a little difficult for some. The mode is CW, a straight hand key must be used, and operators use the hand not normally used, e.g., right-handed ops use their left hand and vice versa, if by chance you're ambidextrous, you must operate the key with your foot. Scoring is one point for each contact, with a bonus of one extra point for each contact where either operator is using "foot keying/' In the case where troth operators use foot key- ing, they score three points each for the contact. There's no prize, but the contes- tants sutmrilt their own score sheets and a winner is declared for this fun activity.
PERU
Luis E, Sifarez OA4f^O/yV5 Apartado 669Q4 Caracas J 061 -A S/enezuafa
I have resided in Venezuela since 1973 and have written several columns here about that country^ but as a Peruvian I miss the flag of my own country in "73 In- ternational" and that's the reason I'm now at my computer, writing about amateur radio in Peru. I hope that somebody down there in OA land feels motivated to tse- come a correspondent for "73 Interna- tional.*"
I wish you readers to Know that I have little material since I left my country 11 years ago, and certainly many things must be quite different. I have tried to get some news but really have not received much. In fact. It is very difficult to receive support from readers and from radio clubs, no matter their whereabouts. Pe<5- ple like to see their names printed and club members are delighted to see their clubs' activities published^ but when you try to get Information for publishing every- t)Ody says "I'll call you,.. I" Actually, nobody calls you back. The same with re- questing pictures or any printed material.
Peru, the land of the IncaSi is located in South America facing the Pacific Ocean > between Ecuador and Chile. The territory has four natural regions: the Coast, the Sierra {AndesK the Selva (jungle), and the fourth, which is the territorial sea that ex- tends 200 miles from the coast. The Coasta Is almost only a strip of sandy land (almost never rains) but it has 23 valleys, one for each river, where most coastal cities are located.
The Sierra Is ail the central region crossed by the Andes from north to south. In this territory is located the highest rail- road and one of the highest cities of the world. Here also Is located the highest lake in the world (Titicaca) and also the third highest mountain in the Americas.
Peru, for communications purpose s^ is divided in 9 zones (call areas) as shown on the map. I remember that the OAii prefix was for maritime mobiles, but now the Radio Amaieur Caitbook lists several Peruvian warships with the OA4 prefix and the designation^ Radio Club Naval BAP (Ship name). I don't isnow the reason for this. There are no inhabited islands in the Peruvian sea, except those with navy installations. Thus I assume that the 0A8 prefix should still be devoted to maritime mobiles.
RadiChamateur licenses are of three
Continued on page W4
DENTRON CLIPPERTON QRO
SPECIFICATIONS
2KW/ 4/5728 Tubes and buiJt-ln tuppty w/luned input
Gutpul (mpidanct SO Otinis iiominal
Ant«nrvi: Load VSWR 2 El^TO 1 nijiM»nium
Finqueney Coverage
160 mei«r bSfHt iaio2 3Mttz
00 msrir bai\^ 3 *i la 4 6 mi
40 melf r bancf fi 0 to 9 0 Mn^
20 m«ler boyid liatoT6DMh2
l^melert^nd ^0t9?3 0Mh;r
ALC Output
Wfgdiive pol^ri^ry. level tsiear E>3nd adjustablifl-
Uodes 01 operation: PGvf^j Requiremofit}: BF Driva Raquifiniertls
OC Watt Votiaijfl
Duty Cym'
Inpui linjKtl«nct
inpul vswn
SSa CW flHY SSTV t?0 Of 240 VAC. 50^60 H?
Spiiriotjs Oulpuls
Inter modulallori 3iO clb or more bel<iw p&aK aulpjl Harmtjuic output 40 db oii' more beJ{]w peak auipuil
■BS wans mNmLfm tOOwalls Eia:
n'Onnnai ISA watts ma?^ fcr
1 kelowaii OC mpLit Weigdi:
£600 vdlts in SSfl mode 1700 vQli^ in ZVi mode
tOtPb an narrnaJ sm jbteiir service
SO Onms r>DminaJ
ti 10 1 tyilicii
t4,rwlde eo&-hjgh le.fi-^deefl
^3 pounds DIE.
amplifier 50 pounds gross
tube ctrtofi 5 pounds gross
DENTRON
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S^6 Unt of Atfy^ffi^Bfs on page S&
73 Magazine • October, 1964 61
}ohn S. Wikox KS4B 640 Breton Bay Drive Leo/1 arc/tt>wn MD 20650
A Tree-Mendous Vertical
Build an 80m DX-getter that really grows on you.
Eighty meters is a fun band. Something for ev- eryone is the byword. From the diverse nets entangling the top end, through the ca- sual groups and rag-chews in the spectrum, to the well- populated CW band, you are challenged not to find an entertaining operation. DX, especially in the winter months, is surprisingly good. With the sun^pot cy- cle approaching its mini- mum, we'll see it get even better.
For you uninitiated, tune
through the 3790-3800-kHz DX window some evening from sunset until a few hours after. For the most part, I guarantee you'll hear stateside stations working DX, What I can't guarantee, with your 30-foot-high load- ed dipole or ground-mount- ed trap vertical working against 3 radials, is whether you1l hear the DX stations. 80 meters is no different in its antenna requirements than the other HF bands, A dipole or inverted-V hung a half-wave above ground is
*0 f-1,
£5 n.
-£>
~nr"
TAPE TAG
NYLON COftO
LOOP
Fig. 1. 62 73 Magazine • October, 1984
a good performer, as is a quarter-wave vertical work- ing against a good ground system. The only problem is that a half-wave at 3.8 MHz is over 120 feet. The oppor- tunity to construct such an- tennas eludes most of us because of space restric- tions or lack of green stamps to buy and plant large support structures. A forty-foot-high i n verted- V might bag WAS on the 3787- kHz CERATOL net during a winter season, but it lacks the zing needed for DX competitiveness.
All is not lost! Described here is a low-angle radiator that anyone with a 40-foot- high tree in the vicinity of the ham shack can con- struct and use to gain that competitiveness on 80 meters.
Design of this antenna is an adaptation of the folded umbrella described by John Haerle WB5IIR.1 I suggest you obtain John's article for further information on this superior design. Construc- tion is simple, straightfor- ward^ and noncritical. No ground radials, base insula- tors, loading coils, or high- cost items are required. Ap- proximately 100 feet of small nylon line, some as- sorted TV hardware, a few ground rods, and four 90- foot lengths of any wire are all that's required. I recom-
mend no. 14 insulated house wire, but Tve used no. 17 galvanized-steel electric-fence wire in one installation.
Observing Fig, 1, you can see the idea is to cage the tree with wire. I use 4 wires, but I have the feeling more vertical wires along the trunk would be an improve- ment Sure, I know. Every- one says trees are great rf absorbers, but Til say this antenna plays as well as John's folded umbrella in my backyard.
Attach four TV-standoff eyes at equal spacing around the base of the tree about a foot off the ground. Form a loop of wire through the eyes. Hammer in ground stakes by each eye and connect wire to the stake and loop by soldering or using small Servit^^^ con- nectors. This completes the ground system! A few radi- als will help if you have the room but are not neces- sary.
Place four more eyes into the tree an inch or two above the ground-ring eyes. Form a wire loop through these eyes. Roughly mea- sure 90 feet of wire and at- tach an end to one of the eyes. Measure 40 feet from the eye and tag the wire, with some tape. Measure 25 more feet and twist a loop
r
o -" o o o ■'
* y<. tn. % ^vj -a; Jt^
Hf Equipment Regular SALE
IC-740* 9-bard 200w PEP xcvr w/mic$ 1099.00 S99"
*FREE PS-740 Internal Power Supply &
$50 Factory Rebate * until gone!
PS'740 Internal power supply...... 159
*E)(-241 Martoumt 20
*EX-242 FM unit , 39.
*EX-243 Electronic keyer unit,. „„ 50.
*FL-45 500HzCW(FJter(lstlF). *FL-54 270HzCWfflter(lstlF)....
*FL-52A 500 Hz CW filter (2nd If] *FL^53A 250 Hz CW filter (2nd IF) *FM4A SSB filter {2nd IF) ........
SM-5 Spin electret desk microphone HM-10 Scanning mobile microphone
liB-12 Mobile mount. .,
*Optiom a/io for IC-745 fisted bef ow
lC'73a 8-b3nd 200w PEP ncvr w/mic$e29.
FL-30 SSB filter (passband tuning) 59,
FL-44A SSB filter (2nd If) 159,
59. 47. 96. 96. 159. 39. 39, 19
00 149^^
00
00
00
50
50
50 89*^
SO 89'=
00 144"
00
50
50
00 599*=
50
00 144»5
50
00
50
00
00
00
50
50
00 ^BS^^
50
50
00
50
IC-745 9-band xcvr w/.l-SO Mhz re vr $999.00 769"
PS-35 Internal power supply . 160.00 144"
CFJ-455K5 2.8 kHz wide SSB filter 4.00
HHi'il Hand microphone . , . , 39.50
SH-fi Desk micropfione 39.00
*See IC-740 Ikt above for other options (*)
FL-45 500HzCWfiHer.,. ,.„.
EX-195 Marker unit... ............
EX-202 LOA interface; 730/2KL/AH-1
EX-203 150 Hz CW audio filter
EX-205 Transverter switching unit SM-5 Spin electret desk microphone KM- 10 Scanning mobile microphone
MB-5 Mobile mount..
IC-720A 9 band xcvr/. 1-30 MHz rcvr $ 1349.
FL-32 500 Hz CW filter..... 59.
FL-34 5.Z kHz AM filter 49.
SI*-5 8'Pin electret desk microphone 39. 116-5 Mobile mount.,.,.,*... 19.
59. 39. 27. 39, 29. 39. 39, 19.
IC-751 9-bandKcvr/.l'30MHzrcvr $1399.00
PS-35 Internal power supply,.,.,.. 160.00
FL-32 500 Hz CW fiiter (1st IF) 59.50
FL-S3 250 Hz CW filter (1st IF) 48,50
FL-52A 500 Hz CW filter (2nd IF)... 96.50
FL-53A 250 H2 CW filler (2nd IF),.. 96.50
FL-33 AM filter .., ,.,.. 31.50
FL-70 2.8 Khz wide SSB filter 46.50
HII-12 Hand microphone 39.50
SII-6 Desk microptione 39.00
CR-G4 High stability reference xtal 56.00
RC-10 External frequency controller 35.00
MI48 Mobile mount... 19.50
Options: 720/730/740/745/751 Regular
PS-15 20A external power supply...,. 1149.00
EX- 144 Adaptor f or GF4/PSvl 5 . . , . 6.50
1199 144"
89« 89"
SALE
134"
ICOM
■ F ■ P ¥
Options - continued
CF-1 Cooling fan for PS-15 PS- 20 20A switching psw/speaker... CC-1 Adapt, cable; HF r3dio/PS-20
CF-1 CoolingfanforP$-2G.,...
EX-310 Voice synth for 751, R-llk SP-3 External base station speaker ... Speaker/Phone patch - specify radio
BC-lOA Memory back-up
EX-2 Relay boK with marker ..,.,..._ AT- 100 lOOw 3-band aytomatic ant tuner AT- 500 500w 9^ ba nd a li tomatic a nt tu ne r MT-lOO Manual antenna tuner........
AH-1 5-band mobile antenna w/tuner PS- 30 Systems p/s w/cord, S-pin plug
GC-4 World clock ...„.....,
HF it near amplifier
IC-2KL w/ps 160- 15m solid state amp
VHF/UHf base mutti-modes IC-251A* 2m FM/SSB/CW transceiver
*$50 Factory Rebate
Regular SALE 45,00 229.00 199"
10.00 45,00
39,95
49,50
139.00 129" 850
34.00 349.00 314*5
449,00 399" 249.00 224" 289.00 259" 259.95 233" 99,95 94" Regular SALE 1795.00 1299
Regular SALE $749.00 549"
until gone!
I C- 55 ID 30 Watt 6m transceiver.....
PS-20 20A switching ps w/speaker
EX'106 FM option...
BC-lOA Memory back-up ,.,.
SM-2 Elect ret desk microphone .... IC-271H lOOw 2m FM/SSB/CW xcvr IC-471H 75w 430-450 SSB/CW/FM xcvr
PS-35 Internal power sjpply ....,,.
PS-15 20A power supply
IC'271A 25w 2m FM/SSB/CW xcvr...
AG-20/EX-338 2m preamplifier.... rC-471A 25w 430450 SSS/CW/FMKcvr
PS-25 Internaf power supply
EX-310 Voice synthesizer
Hlll~12 Hand microphone
SM-6 Desk microphone ............
VHF/UHF mobile mukt-modes IC-290H 25w2mSSB/FMxcvr,TTPmic IC-490A lOw 430-440 SSB/FM/CW xcvr VHf/UHF/1.2 GHz FM 1C-22U lOw 2m FM non-digital xcvr
EX- 199 Remote frequency selector
$699.00 599" 229.00 199" 125.00 112" 8.50
39 00 899.00 799" 1099.00 Call 160.00 144" 149.00 134" 699 00 619"
56.95 799.00 699"
99.00 89"
39,95
39,50
39,00
549,00 489" 649,00 579" Regular SALE 239,00 249" 35,00
Closeout Item Regular NOW
IC-25H 45w. 2m FM w/up-dn TTP mic 389.00 299"
BU'IH Memory back-up .......... 38.50tlO"°
t BU IH SIO purciiased with iC'25H, otherwise S38.50
IC-27A Compact 25w 2m FMw/TTP mic IC-27H Compact 45w 2m FM w/TTP mic IC-37A Compact 25w 220 FM, HP mic IC-47A Compact 25w 440 FM, HP mic
LIM6/EX-388 Voice synthesizer... IC-120 Iw 1.2 GHz FM transceiver.... 6m portable IC-505 3/lOw 6m port. SSB/CW jccvr
BP-10 Internal f^icad battery pack
BP-15 AC charger.............
EX-Z48 FMunit.
LC-IO Leather case
«■■■ + ■ + ■■ p
369.00
409.00
449.00
469.00
29.95
499.00
Regular
$449.00
79.50
12.50
49,50
34,95
329" 369" 399" 419"
449" SALE
399"
Ft and- held Transceivers Deluxe models Regular SALE
IC-02A for 2 meters $ 319.00 289" IC-02AT w/DTMF 349.00 314"
IC 04A for 440 MHz TBA 1C-04AT w/DTMF..... 379,00 339"
Starfdard models Regular SALE fC-2A for 2 meters $ 239.50 2W^ IC-2AT with TTP..,.., 269.50 21 9»=
IC-3A for 220 MHz... 269,95 234" 1C-3AT with TTP 299.95 239"
IC-4A for440MHz.., 269.95 234" IC-4AT with TTP 299.95 239"
/\cce55orre5 for Deluxe rrtodeh Regular
BP-7 aoOmah/ 13.2V Nicad Pak - use BC'35 67,50 BP-8 800mah/3,4V Nicad Pak - use BC-35... 62.50 BC-35 Drop in desk charger -all batteries.... 69.00
BC-16A Wall charger ' BP7/BPB 10.00
Accessories for both models Regular
BP-2 425mah/7.2V Nicad Pak - use 8C35.... 39.50 BP-3 Extra Std 250 mah/8.4V J^icad Pak .... 29,50
BP-4 Alkaline battery case 12,50
BP-5 425mah/10.8V Nicad Pak - use BC35 49.50
CP-1 Cig, lighter plug/cord - BP3 or DIx. 9.50
DC-1 DC operation pak for standard models 17.50 LC-2AT Leather case for standard models..... 34.95
LC-14 Soft case for Deluxe models 17.95
HM-9 Speaker microphone, .., 34.50
HSIO Boom microphone/headset 19.50
HS-IOSA Vo)t unit for HS-10(dk only] 19.50
HS-IOSB PTTunitforHS-lO 19,50
HL-1 2m 2.3w in/lOw out ampiifier SALE 79.95
Ml-25 2m 2.3w in 20w out amplifier.... SALE 179.95
3A-nN Optional TT Pad -2A/3A/4A..,. 39.50
SS-32M Commspec 32 -tone encoder 29,95
latM*:^™--
i$.ll^l .
/^^N:
UK f^ 9» tm
W «r S^ «i^
- -WMt-SSHK
Shortwave r (reivers
R-71A 100 Khz 30 Mhz digital receiver
FL-32 500 Hz CW filter
EX-310 Voice synthesizer
RC-11 Wireless remote controller...
CR'64 High stability oscillator xtal R-70 100 KhZ'30 Mhz digitai receiver
EX' 257 FM unit . .^ . i . . , . ,
iC-7072 Transceive interface. 720A
FL-44A SSB filter (2nd IF).,.,
FL^63 250 Hz CW filter (1st IF)
SP-3 External speaker ..,..
CK-70(EX-299) 12u DC option
MB-12 Mobile mount
f i « 4- P
H ■ ^ P -F 1 « I
Regular SALE $799.00 689"
59.50
39.95
59.95
56.00 749,00 599"
38.00 112.50 159.00 144"
48.50
49,50 9.95
19,50
JiSAm
Order Toll Free: 1-800-558-0411
HOURS: Mon. thru Fri. 9-5:30; Sat 9-3
Milwaukee WATS line 1-800-558-0411 answered evenings uniil 8:00 pm, Monday thru Thursday.
Please use WATS line for Placing Orifers.
For other information, etc. please use Regular line
In Wisconsin (outside Mitwaukee Metro Area)
1-800-242-5195
1 ^i h\ I lU ;i 4 llilllliJM*llIU
Inc.
4828 W. Fond du Lac Avenue; Milwaukee,
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1898 Drew Sfreet
Phone (813)461 4267
No In State WATS
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Associate Store
CHICAGO. Illinois B0€30
ERICKSON COMMUNICATIONS
5456 N. Milwaukee Avenue
Phone (312} 631-5181
1-800-321-3594 Sa 1-800^327-1917 No Nationwide WATS Ea 1'800"634^6227 15 min, from O'HBfBl
73 Magazine * October, 1984 63
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PORTABLE ANTENNA
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in the wire. Attach about 30 feet of nylon cord to the loop. This is shown in Fig, 1. Now climb the tree with the loose end of the wire, mak- ing sure it lays close along the trunk. When you reach the tag height, screw in four more eyes. Again, form a loop of wire through them. Thread the loose end of the wire through one eye and throw the remaining wire and nylon cord out through the branches, A weight will help. Bring up three nriore wires using the respective eyes. I did these one at a time to keep them from tan- gling. The branches of my oak tree were enough to contend with!
At the top standoff eyes, attach a 10- to 15-foot wire to each. Either continue up the tree with them to anoth- er eye and wire-loop ar- rangement, or if youVe mn out of tree, lay them out on limbs to form a semblance of a top hat
When you're back on the
ground, pull the four loose wire ends in to the tree trunk and connect them to their respective eyes as shown in Fig. 1. All con- nections should be sol- dered or connected with Servits,
Open-wire feed from an unbalanced matchbox will net you all bands from 160 through 10 meters. If you desire coax feed, you might have to adjust the top-hat length to resonate the an- tenna to your preferred 80- meter frequency, although you'll find if s quite broad- banded.
Now try 3790-3800 kHz some evening and enjoy working DX. I know it doesn't outperform WICF^s phased array, but then I haven't wired the other three trees ?■
Reference
1- John M. Haerle WB511R, "Folded Umbrella Antenna" Ham Radio, May, 1979.
AMATEUR TELEVISION
KPA51 WATT 70 CMATV TRANSMITTER BOARD
• APPLJCATtQiNS: Cordless portable TV camera for races & ofher pybllc service events, remote VCR. etc. ftemote controf ol R/C aiiplanes or robots. Show tvams tfPdeo Upe*. computer programs, repeal SSTV tg focal ATVers, DJ^ deoflfide or* unl^nn^fi and terra en lyp. 1 to 40 mites.
• FULL COLOn V10€0 « SOUND on one sffiall 3^5*4" board
• RUNS ON EXTEf^NAL 1 3,B VDC at 3O0 ma supply or bstlery
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• 2 AUDIO INPUTS lor a low Z dynamic and Ime level audio input found m most portable color cameras. VCRs^. ot h<Kne computers
• ALLIGATION NOTES * scfiemalic: supplied for typical exteTrral connections {iftChAgmgL and system operBliort
m PRICE ONLY tl&g del4vere€! via UPS surface in the USA. TechniCiSJi ciA5S amateur lioense or 4itgti«f required lor CHifchsse aod operatiO'rt
WHAT J$ neOUIRED FOR A COMPLETE OPERATING SYST^NT? A TV ^t wUh a TVC-2o*TvC -i ^20 4^ mHz (o channel 3 downcofiifertef, /Ocmantenn^^ai^dcoajt CAbte to recerwfi Padi^ge up tr»e KPA5, add 12 to 14 vdc antenna, an-d any tv camera. VCR, or computer witt) a Qoo^iosite vudso output Simple elf?
CALL OR WRITE FOR OUR COMPLETE CATALOG & niore (n#c or^ atv dowrnconverlerB, anienrtas, camefa^, t^' : or who ts on in your area.
TERMS Vts«H MftfltorcaftL m ca^ only UPS COD liy telepN>ne or mail Telephone ord«f^ A postal MO usvsily stiifiped wittiin 2 days, all ottier checks must dl«v twioiii Ship^neni Trans miTimg equipment sokl o*i*y to tic^ised amateurs ¥«rdied in 1984 C«llboOK Cabi tnclude- s^es Idx
(SIS) 447-4565 m-f Sam-6prT> pst.
P/C. ELECTRONICS
Tom W60RG Maryann WB6Y5S
2522 Paxson Lane Arcadia CA 91006
64 73 Magazine * October. 1984
Announces:
A User-Friendly Software Package Designed For Easy Operation of Morse. Baudot, ASCII, and AMTOR. A Feature- Packed Program
MAIN MENU SCREEN
hti:niin:ss
MBA-TORT" COPYRIGHT 1984 BY AEA
SELECT: M. MORSE A. ASCII R. RTTY T. AMTOR U. AUTO AMTOR X. AUTOCALL C. COMMANDS 0, OPTIONS
Now Avaiiat}le for the Commodore 64 Computer in Two Versions. MBA-TOR 64 Software Package Only, at $119.95 Suggested Retail. MAP-64/2 Software with Self-Confained Interface $239.95 Retail.
Just Look At Some Of The Features:
OPTIONS MENU SCREEN
*- CW receive and transmit at 5 to 99 wpm, auto speed track on receive. *- 7 bit ASCII, receive and transmit at 110, 150 or 300 bauds. *~ 5 bit Baudot, receive and transmit at 60, 67, 75, 100 or 132 wpm. *^ TOR, receive and transmit ARQ (Mode A) or PEC (Mode B) and listen, *^ Beacon and WRU system, includes ORG check before XMT, won't QRM.
Message forwarding system, AUTO-AMTOR still functions in this mode.
Selects command menu. *- Selects options menu.
+ Complete precompose sptft-screen display wfth status information. + Complete printer control including SELCALL/WRU printer control.
|
hh;mm |
|
|
1. CALLSIGN ?????? |
|
|
S. SELCALL |
7777 * * * HP |
|
T. ARQTIMEOUT |
30 |
|
U. USDS |
ON |
|
M.MORSE FILL (BT) |
OFF |
|
R. RTTY SYNC (NUL) |
OFF |
|
A. AUDIO FEEDBACK |
OFF |
|
C. AUTOCR |
ON |
|
L. AUTOLF |
ON |
|
B. BEACON RECORD |
OFF |
|
W. WRAP-AROUND |
ON |
|
K. CW BREAK-IN |
OFF |
ss
0. OUTPUT MODE WORD
COMMAND MENU SCREEN
hliimmiss
L LOAD
E, EDIT
W. MOVE
S. SAVE
X. SET XMT BUFFER SIZE
C. SET COLOR
T. SET TIME
24-hDur clock, shows time in hours, minutes and seconils.
Allows entry of your cillsign for auto operations.
Derived from your eallsign automaticaily, can be changed.
Sets ARQ phasing calls from 1 to 99 seconds.
Unshift on space, toggles on or off.
Transmits Morse Idle character during breaks in KBD actfvtty;
Transmits RTTY idle character during breaks in KBD activity.
Produces click in monitor audio when any key is pressed.
Sends cdfriage return the first space after 65 characters.
Sends a line feed after each carriage return.
Allows the beacon to be recorded to the QSO buffer for logging. '^ Sends CR/LF if there is a space in the last 5 positions on the line. -^ Automatic transmit/receive switching during QSO.
Transmit In word mode (text sent on space) or character mode.
+ Break-in buffer on all modes, toggle QSO buffer on or off.
+ CW speed lock and Farns worth low-speed CW.
+ 10 soft-partitioned^^ message buffers pius direct from disk or tape
-^ Allows loading of message or QSO buffers from disk or cassette. ^^ Word processor type edit functions on message and QSO buffers.
Allows transmission of QSO buffer without disk or cassette systems •*- Allows you to save message and QSO buffers to disk or cassette. -^ Set the transmit pre-type buffer to any size you like. '^Choose among any of 16 colors for character, screen or border, *- Lets you set the time of day clock.
+ Insert QSO station's call into any buffer while stiti copying. + Includes a complete manual, keyboard overlays and cables for
the AEA Computer Patch™ or Micropatch^^ Interface. + For more information call AEA, or see your AEA Dealer.
Advanced Electronic Applications, Inc.
P.O. BOX C-2160 • LYNNWOOD, WA 9d036 • (206) 775-7373
TELEX: 152571 AEA INTL
73 Magazine • October, 1984 6S
Bob Eidndge VE7BS Erickson Road PembGfton BC VON 2L0 Canada
When Darkness Calls
On 160m, success means diligent planning. These tips on gray-line propagation are your key to Top-Band DXCC.
Anyone who works Top Band knows that strange and wonderful things hap- pen around sunset and sun- rise (twilight at your end of the QSO, at the other end, or at both). There are some in- teresting reasons for this, and if you have a better un- derstanding of what causes the DX to emerge at these special times, you have a head start in the drive for WAC or DXCC 1 60.
"Sunrise" in this context may last quite a while, from sometinne before the sun ac- tuary appears until some- time after it has cleared the horizon. The duration of the effect depends on the lati- tude of the focation and the time of year. For example, in midwinter at the equator the time window is very narrow, about ±5 minutes; at 50^ about ±45 minutes; at 60^ about ±90 minutes. If you have watched the sun rise in
the tropics, you will have no- ticed that it rises almost due east and zooms straight up into the sky very quickly. In polar regions it creeps out of the SSE horizon and travels almost horizontally, so it is not easy to decide just when it has actually arrived.
Finding the Times of Sunrise and Sunset
There is no problem in knowing when to expect your own sunrise and sunset, but how can you find the times for a particular DX lo- cation? Here are some of the ways:
1)The "DX Edge'^ is a slide-rule-type operating aid made especially for this pur- pose and has information on zones, prefixes, etc., as well. It is simple to use and is available for $14.95 post- paid from: The DX Edge, PO Box 384, Madison Square Station, New York NY 101 59.
^ . _ longitude W cos-^(tan a x tan latitude N)
15 15
gj . longitude W cos -"'(tan a x tan latitude N)
15 15
Fig, 1 Formulas to calculate sunrise and sunset in decimal UTC where "a'' is the inclination of Earth's axis with respect to the direction of the sun at that particular time of year.
66 73 Magazine • October, 1984
2) If you have a calculator which handles trigono- metric functions (and you know how to use it), the times can be calculated us- ing the formulas in Fig. 1 . To use these formulas you have to know the inclination of Earth's axis with respect to the direction of the sun at that particular time of year. John Devoldere ON4UN has a table showing this in his book, 80-Meter DXing, and can also supply a computer printout of times by prefix. An inclination table can also be found in K6UA's ''Cray Line'' article in CQ, Septem- ber/1975, p. 30.
3) If you have a Commo- dore computer, you can buy a collection of programs (which includes an excellent sunrise/sunset program by David Williams) for only $10.00 from Public Domain, 5025 Rangeline Road, West Milton OH 45383. If you own a Commodore 64, ask for Collection #4 and you'll get 37 other programs as well for your ten bucks — can't beat 25<F a program! You enter the latitude and longitude of the location and the date; if you wish, it will automatically convert to UTC (GMT for the old-
fashioned or Zulu for some). The computer also asks for the angle of the sun over the horizon. 1 enter 0°. The au- thor of the program put in ^J5^ as "a widely-used fig- ure," It makes only a few minutes difference in the calculation, but if anyon!| out there in 73-land knows what this is all about, write a letter to 73 and let the rest of us know.
4) Finally, you can use Fig. 2, which is taken from a CCIR Report and is good for anywhere in the world at any time of the year The time scale is in local stan- dard time, so uSe the longi- tude of the station concerned to convert to Universal Time.
On the month axis, esti- mate the position of the spe- cif ic day on the scale. This is very important in spring and fall; for example, you will see from the chart that at 50^S on the 1st of February, sunrise is about 4:40, but by the end of the month it is 5:25.
The Cray Line
The great circle line around Earth dividing the dark side and the sunlit side of the planet is called the "terminator." It is not a very
sharp division except near the equdtui, dnd radio ama- teurs call it the gray line, a descriptor brought into radio term inology by KbUA
On the daylight side of Earth, the D-layer of the ion- osphere IS heavily ioni/.ed and absorbs most of the 160- and SO-meter signals, pre- venting them from reaching the reflecting layers above At night the Delayer has de- cayed and these signals can easily go through to the upper layers and be reflect- ed down to more distant lo- cations.
At the tenninator, a spe- cial condition exists Fig J shows the conditions in the ionosphere which help the DXer at the eastern end of the darkness path at sunrise (turopean working into W, or W working into )A, for ex- ample).
Ionization builds up first in the upper layers, and in fact never entirely disap- pears from them in the mid- dle of the night At twilight the D-layer is only partially ionized too little to absorb the IbO-nieter signal, and too much to allow the signal to pass straight through to the upper layer and be reflected down to medium distances (as it does during the night)
The partial ionization causes the signal to be re- fracted (bent) in the D~ layer and it may travel hun dreds or thousands of miles within the layer before go- ing on its way to the upper layer. Nut only does it go further before hitting that layer, but it also arrives at a narrower angle, making for both better reflection and a longer hop.
You can see that for a sta- tion nghi nvdi the termi- nator, an antenna with a highangle vertical takeoff lobe may sometimes reach out further than one with an antenna which concentrates the signal closer to the hori- zon, but the low-angle an- tenna will stay in contact for a longer period after sunrise
Sunrise
Sunset
50*S4i* 20=^ 0* Ifl^ #0* SO* ii*M
02
oa
04
•S
Of
07
01
09
Local Standard Tinne
Fig. L Times of sunrhe and sunset anywhere in the world (in local standard i/mej.
There is another phenom- enon which helps the Top Bander at sunrise. On the dark side of Earth, the Flay- er is higher than it is on the sunlit side At the termina- tor, where the transition from one height to the other occurs, the layer is tilted and signals reflected from it come down at a more useful angle for DX working Fig 3 illustrates this effect which was explained in 1979 by Hortenbach and Rogler^
So what do we do about it?
• At your sunrise, look for signals from the west of you
• At your sunset look tor signals from the south and southeast (along the termi- nator] and then from the east
• If you are in darkness, look for signals from the east at the distant station's sunrise or before iL
• If both you and the dis- tant station are on the edge of the darkness path, there ts an especially good chance of propagation between you ■
References
1 John Devoldere 0N4UN, 80- Meter DXing^ Communications Technology, Greenville NH 03048,
2 K6UA, W6NLa, and K6SSS,
FUYER
"The Gray Line Method of DX- ing/* CO, September, 1975. 3. K. J. Hortenbach and F. Rog- ler, "On the propagation of short waves over very long dis- tances. . /\ T&lecommunica' tfon Journal, June, 1979.
D LAYER
k
^ X Sunrise in Europe.
73 Magazine * October, 1984 67
I
/..I
BmERN BUY
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Individual (nDncomn>tfcial^ Cofnmerc^al .
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ADVERTISING COPV
AidTveriiismg musi perfain to amateur radto protiucts or servECes. No special layouts Of positior^s are possible- All adveritsing copy itiust be su&nnitted type^ written {doubl^spac«d]i ar^J m^ist include lull name and address Copy hmtied to 100 wordSn maiimuni Count only words in text AtSdress, Uee,
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Copy must be receive<j m Petertxirough by the 51 h 0I I he second month pre- ceding the cover date if copy is received afier the deadlir^. it will be scheduled I0 fun the following mon!h, unless specif tcally pf<^ibited by I he advertiser.
MATERIALS Send lo Advertising Deparlmeni, 73, Elm Street, Peierbofough NH 0345B.
MOBILE IGNITION SHIELDING. Free Htera^ tyre. Estes Engineering, 930 Marine Drive. Port Angeies WA 36362. BNBOOe
WANTED: Cash paid fo* Vim SPEED RA^ DAR EQUIPMENT Wnte or call Brian R E^ierman, PO Bq% 8141, Norfhfield IL 6Q0da:{3lZ]h2&l-@WV BNB03Q
MILITARY TECHNICAL MANUALS lor old jUYd oli&otete equipment 60-page tataiog. $3.00. Military Technical Manual Service. 22^ Senasac Ave.. Lone Beach CA 90615. BNe045
MAGICOM RP SPEECH PROCESSORS- Add6ct0 of average output with genuine rf chpping in your iranamitter's hf stage. Custom engineered for Kenwood 15-120, TS-130. T&430. TS'520, TS-530. TS-620; Drake r4X, TR-7: Vaesu FTt02, Btcellent speech quahty, simple mstalfation. af- focdable prices! SASt for daia and cost. Mag^com, PO Bo* 655^, flellewue WA 96007 &NB101
RCPAtft alignment, calibratirm. Collins written e^iimate^. $25. nor^Coliins, S50- KlMAN.<Z07H9&-22tS. aN&1|7
IMBA— International Mission Radbo A^so- elation helps re^issionarles by supplying equipfnent and running a net for I^efh dalty eMcept Sunday. 14 280 MHz. ^900-2000 GMT. Br. Bernard Frey. 1 Pryef Manor FkL. Larchmoni NY 1053B aNei23
ELECTRON TUBES: Receiving, transmu- ting, microwavo. . .all types available. Laroe stock. Next -day deli^r«fy m niost cases. Daily Electronics, t4t26 WIHow Lane, Westminster CA 926^3; (Fl4hS94 136a. 6NS150
SCIENCE SOFTWARE for ViC'20 and PC-2 Radio astronomy, moon bounce,
amateur sateNlti^s, etc. David Eagle. 7952 W. Quarto Dr., Littleton CO fl0123; [303)- 972 4020 BNBI S3
FREE CATALOG— computer supplier. Control Oaia SS/DD. $^^. DS^D. $3T. Dy- san SS/00. S3CI; DaOO S40 Ribbons: MXaO. 17.60. MXIOO. St4. Okidata B2-9Z t5 50; Ofcidaia 84, $5{J0, Diatrfo Hytype II nvs. £4 40; Diablo Hylype 11 fiyton. S4.80: NEC Spinwriter m/:&. $4.7^; &ou1let surge and spike power strip, $49 J5, Stiipping,
HAt/i HELP
I need someone to ad|LJS( a Mite tele- typewriter, i Will pay all repair costs and shipping.
Harold Parlis WB2BNH
24 Caryl Avenue 6-C
Vonkers NY 10705
tB14V963^}6a9
Telegraph or wirelBss key, made in South America Tof use in South America, wanted for a private collection.
Dick Randall K&ARi
1263 Lakehursl Rd.
Llvermofe CA 9455Q
68 73 Magazine * October, 1984
I need help locating design data and wiring Information for wiring power I fans- formers.
Howard Muften N7FOA
1^ esi.se
Eptirati WA ddS23
I need sc Hematic diagrams arid align- ment in^trucUons for Hallicfafters SXlt7 and HT44, i will pay copying cost ar>d postage or copy and return.
William Hartley H2RDS
1201 Paul Ave.
Sdienectady NY 12306
£3.00, Ma St efcardA/isa— include number and expiration dala OUTPRINT. 44 For* rest Road. Bandoipb NJ 07969. BNB1S9
SWL REPORT FORMS designed for maxi- mum information at your listening post. Give real rrw^anmg to your DK report s. De- tails 2 iPtCs Roul. 3/137 Cttamplon St, Cliristchurch. NewZeatafid. BNB180
DIGITAL AUTOMATIC DISPLAYS for FT- Ids, TS-520fi, ColHns. Drake. Swan. Heath, and others. Six 1/2 ' digits. Write for information Grand Systems Dept. A^ PO Box 3377. Blaine WA 98230: (604)'5304551. BNBie3
VlC-20/C'64 budget priced intertace^soft- ware for lull CW icv/xml. Features LED tuning, programmable messa9e buffers, large type-anead buffer, and rf>ore Works with any rig. Specify computer and dish or cassette; $39,60. Paul Ros^Aran; N5FQN Route 4. BoJi 24D. Taylor TX 76574 aNei9l
ANTENNAS WANTED: ^e pay casli lor surplus amateur ar^d CB antennas. Musi be m original boxes and in reasonably 900d coridilYOn S^nd a l^st or calt H C Van Valifah Co.. n40 Hickory Trail, Down- ers Grove IL 60515 RNBI95
NEW HAfWSWL SOCIETY for unity of thought ^ learning Open to alt, Many top- ics, awards, free ad space in periodical, society net. museum participation Shack pics & QSL^ welcome. Writers needed. SAS£ tor info to RCSW. 32 Appleg.ale. Bennington VT 06201. BNB197
KT5S SUPER DX SLOPER 80- 10m only S59 95. KT5B mulliband dipde 160- 10m only 15995 2 kW roiter inductor ^28 uHj £47.50 Wealhw-boot fcit tPL259> SBSS p.p, Much rrvofe! Info aYaitable. Kilo Tec. PO Box 1001. Oak View CA 93022. (SOSf 646^9645. BNBISO
YOU (CAN BE1 VERSUS CRtME. Security alarm systems easily ] earned, Employ- ment business teTrltlc. Age no barrier Get in now. Don't delay, information package $2.Q0. Security Electronics International, PO BoK 1456 RK, Grand Rapids Ml 49501. BNB203
WANTED-fytlUTARY SURPLUS RADIOS. We need Collins 54fiL-4, 54au 1. 5487 V, 4260-2, yHF7t&A. etST. Af*C-S4. ARC t02. RT.7I2^ARD10S. AflOlt4, ARC*115, ARC- tte, RT.823/AR&l3t w FM62a WikoK a07A or HT-B57^AROl34, ARC- 1 59. RTH67 Of RT-t15&AfC-l64, ARC-174, RT-I29i/ARC 186, APX-F6, APN 171. MRC-98. 7%%F At2 HF 405. Collins antenna couplers 490T-1. 49IIT'2, 490T9, CU-l65aA/ARC, CU 1669/ GRC- CU l402fARG, 4903-1, CUt23S^ARC 105. Top dollar paid or trade for new ama teur gear Write or phone Bill Slep, Slop Electronics Company. Highway 441, Otto NG 287S3; (r04)'524 7519, 8NB204
COMMODORE 04 CW INSTRUCTOR PRO GRAM. Genera I es CW on TV speaKtir R.-jn dom code, keyboard input, or prerecorded CW tesis. Character speed and spacing set Independently, Designed for classes arkd increasing code speed. S 15.00 ^disk- ette or cassette (specify}. Dennis Olvef N7BCU. 2200O S Tonya CI . Oregon City OR 97045. BNB205
FOR SAL& LNW System ExpafBion 2 S250. Holmes Sprinter |45, Langley amber CRT $50, TEK'535A manual S30. rnint 5iJ4 S2O0. TEK-585A on cart wfmanual & 3 plug in units $425, 4-lOOOA used/tested $50. Rus sell L Lawson, 124 Soutn Grand St,. West SuTfield GT 06093; {203>668-2B7l. BlSfB206
CHESS PLAYERS— RacJio<hess sched- ules, match^. tournaments. Details: K2ViJ* Box 682^ CdIo{^ NJ 06211 BNe207
COMlitODORE 64 OWNERS: Now a ci^tom CW cartridge wiih yout name aiKf call. Seivd aitd receive up to 30 wpm with split- screen display Complete with rnstruc- tlons and schematics fof home-brew inter- face only $3895 Cusiom CW 2.0 from ALC Electronics, 718 W. Coral Ave.. Rtdgecrest CA 93555; (619K375-7203. BNB20a
TWO METER QUAD— two-element plastic construction. Asseriibly (equlred. S21,50 + $4.00 s&h. Michigan residents add .86 state tax. Mercury Products. Box 596. Sau- gatuck Ml 49453 BNB209
EtMAC 6874s— New, (ale manufacture^ ilBO. W9ZH, (414H34'293fl 8NB210
SES receivers & dOfwnconv. w/lnstr.. capa- ble of receivtng between 2 GHz & 4 GHz. limabie audio, as is- flOOOO^I. Call VI, 18181-705-2422 BNB211
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BACK ISSUES Of 7J: January 1969 ttuough February 1962 complete except lot March 1980. Prefer pickup or yuu pay Shipping 13 year^ of articles' $130.00. Steve Gufdstein. 99 Chartes St., Reading MA 01867, ^6^7^944-71(K eves before 11 EOT. BNB2t5
ENGINEERING SOFTWARE-Free flyer and money bacl>( guarantee CP/M, MSD05, TRSDOS. PL OTPRO— graph printing pro- gram, Lmear^logarithniic, multiple plots. grid Vines, labeling, S52.95. ACNAP— ana- lyzes actlve^passlve elec Ironic circuits, Monte Carlo, worst'Case, sensitivities $52,95. SPP— signal processing. FFT. iin* earrnonitr>ear, La Pi ace, transient analy- sis, more. $£2 95, BV Engineering. 2200 Business Way. Suite 207, Riverside CA 3250T; {7141-781^252 BNB216
MAKE PRINTED CIRCUITS BOARDS With- out messy chemicals Cofnp^ete instruc- tions, $2,00 postpaid Kenneth Hand WB2EyF. PO Box 70ft, East Hampton HY 11937 BNB217
QSLS 4 RUBBER STAMPS. Top quality. OSL samples and stamp information 50<c. Ebbert Graphics D?. Box 70, Westerville OH J30B1 BTsiB?l8
HAM RADIO REPAIR, lube through solid state. Roberl Hall Electronics. PO Qox 8363, San Francisco CA 94128; {4061-729 8200 BN8219
HAM TRADER YELLOW SHEETS, m our 23rd year. Buy, swap, sen ham^'ad^o geaf, Publistied twice a month. Adsqui^kty elf- cutate— no loofl wail Iw results SASE for sample copy. $9 for orw year (24 issues}, ROB 356 Wheaton I L 60189 BNB220
DX HEAtKNG MAPS foi Bostm. NYC. Pt^iLa^ Baltimore, Dei roil. Atlanta. Chicago, Heitt Orleans^ Samt Louis^ Dallas. LA. t1 x 17 $1 75 pp 22 ^ 34 $5.95 pp. Specify city. Bill Massey W2H0J, PO Box 397, Haines port NJ 0&036. BNB221
SOCIAL EVENTS
Listings in this ct^urnn am provit^Ki t/w* oi chafgs on a spsce-svaitabf^ basts The fot" lowing mformauofi sfjouid i>e inctuded in every snrroxjncemem: sponsor, event, date, time, piMce, ctfy^ state, admission charge (if anyl features, tAlk-in frequencies, and the name of whom to contact for further mtorma- tiof}. Announcements must be received by 73 Magazine by the first of the month, two months prior to the month in which the event t^kBs piece. Mail to Editoriaf Offices. 73 MaQ- aiine^ Pine $t, Peterboroi/gh NH Q345B.
OTTAWA ONT CAM
cx;t 5-T
The Ottawa Amateur Radio Club will ho^t thQ I6ihi annual Badio Society of Qtv larlo Convdntioo on Octobef 5-7, 1964, at Ihfi naw Wdstiri Hqt^ ifi Ottawa. Registra- tion Is SHOO. Ihe non-amateur progr^^ ps i4.S0, I he Friday -night eyeball and dance is $6-00, and rhe Saturday l^anqu^l and dance (i4-pieGe orchestra) is $27,00, Other features Include forums, papers, commer^ clal dlsplay^B all day Saturday, and a Sun- day-morning program. Talk-in on 146.34/ .94. For more information, contaci RSO Convention Committee, PO Box 15806, Station "F'\, Ottawa, Ont., Canada K2C 3S7.
WARRIKGTON PA OCT 6-7
The Pack Bats (Mt, Airy VHF ARQ cor- tfelly invite a)l amateurs arvj tf^etr friends to
the dtti annual Mid-AHantic VHF Confer- ence whjct^ wilt t>e held on Saturday, Octo- ber 6, 1984. from i:00 am to 5:00 pm. at the Warrfr\gton Motof Lodge, Route 6i1, War- rington PA, and to their 13th Pack Rat Hrnn- arama on Sunday, Octot^er 7. 1984, from 7:00 am to 4:00 pm, rain or shine, at the Bucks County Drive-In Theater, Route 61 1^ Warrington PA. The conference will fealure an aH<lay VKF program, a cocktail hour and get-together al 6:30 pm, and a buffet dinr>er (SI 3.00 each) at 7:^ pm. Conference registration is i4 00 in advarvce ^before Sep- tember 23rd), $5.00 at the door, and irv> clud^ admistioci (o Ihe Hamarama. Ad- mission to ihe Hamarama flea market on Sunday is S3.00 arxS selling spaces are S5.0Q eactt The gate wiJI open at 6:00 am for seil^^ (bring your own tabiesl. Food and drinit will be available. TaikHn on 146.52 MHz (W3CCX). For more irrformation. con- tact Hannarama '84, Po$t Office Box 311, Southampton PA 18966. or phone Lee A. Cohefi K3MXM at {2^5}^^5^4Q42.
DEEAFfELO NH
OCTB
The Hoss trader 5' Fall Tailgate Swap- fest will be held on Saturday, October 6, 1984, sunrise to aunsei, at the fairgrourids. Daerfieid UH. A^jmi^ion is S2.{30, which in^ taiigaters. For a tKsminal fee. camp-
ir^ will be avaiiaible aft&r 4:00 pm on Friday (no reserved spaces). Profits benefit the S^rir>ers' Burn tnstllute and fast spring's donatfon was 55,@13. For a map or rrvore infofmatj^on, send an SASE to Joe Dema- so K1ROG, Stai Route, Box 5a, Bucksi>on ME 04416.
HAMILTON ONT CAN OCT 6
The Hamilton Amateur Radio Ciub. Inc., will hbold its 2nd annual flea market on Sat- urday, Ck^tober 6, 1§34, beginning at 8:30 am, at Marritt Hail, Ancaster Fairgrounds, 625 Highway 53 East. Admission is $2.00. Flea-market vendors' 8- foot tables are S4.00 plus admission and commercial venciors' S-lool tables are $10.00 with admission in- cluded. There will be room for 150 vendors and setup will l;ke from 7:00 am to 8:30 am. Colf^, soft drinks, ami sandwiches will De avajlable, TalkHh on 14&1&146,76 IVE3NCF). For gpace reservations, contact HARC F^eaMarket Committee, PO Box 253, Hamilton, Gnu Canada LBH 3C& For more Information, contaci Stan VE3GF£ on VE3NCF.
BALTIMORE MD OCT 7
Ttre Columbia Amateur Radio Associa- tion will hold its Qth annual hamfest on Sunday, Octobef 7. 1964, from 8:00 am to 3:30 pm, at the Howard County Fair- grounds (15 miles west of Ball I more, just off 1-70 on Route 144, 1 mile west of Route 32). Admission is &3.00 and XYLs and chll- dren will be a dm! tied free. Tables are S6,00 additional if paid by September 30th and $8.00 additional after that date. Out-
door tailgatir^ is £3 .00 additional and Irv door taltgatifig is $6.00 additional. Food wilt be available. Talk ih on 147.735/.135 and 14632^,52. For table lesenrations and more informatJon. write Mike Vore W3CCV, 9098 Lambskin L^ne, Columbia MD 21045, or phone i30lh992-4953.
flOMEGA OCT 7
The Rome Hamfesf will be held on Sun- day, October 7, 1984. beginning at 8:00 am, at the Ctvic Center In Rome GA. Talk- In on 147.&O/,30, For more Information, phone T, J. Freeman a I (404)232 2B30.
BENTON HARdOR Ml OCT 7
The Blossom! and Amateur Radio A350- cJation will hmd its i9&4 Blossomland Bia$t on Sunday^ October 7. 1964, from 8iM) am to 3:00 pm EDT, at Ihe Lake Michr- gan College Community Center. 1-94 Beit 30, just west of Benton Kart)or Ml Admis- sion is $3.00 per person artd tabi^ are $5.00 each. Special features wtt! include an Air Force MARS display, a Skywarn training program, and a radio-controtfed a^ri^lane display. Talk^in on .221. B2 and .52 simpteK, For more information, contact BARA, PO Box 175, St. Joseph Ml 49066, or phone Paul WD8MWT at {6ie)-e83-l7lO.
SANTA FE NM OCT 7
The Northern New Mexico Hamfest will be t>eid on October 7, 1984, (rom SIX) am
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73 Magazine • October, 1984 69
,ki
to 3:00 pm^ at the Terrero Group ShaJter, along the Pecos HW&r, east of Santa Fe, Admission is $3.00 for adults and $1 .50 for chUdren. Activities vvlEt include a taEEgate flea market, yroup me&ting&i family games, fishing, and pIcnicKing. There will be hot dcgs, chips, soft drinks, and coffee availabte, as well as free Saturday-nlghl camping. Talk-in or local mpeaters and 52 simplex,. For further information pEease send an SASE to Northern New Mexico ARC, do Bob Norton N5£PA^ Route 3, Box 95-15. Santa Fe NM B7&01, or call on 3,939 MHi at 0100 UTC
yONKERS NY OCT 7
The Yonkera Amateur Radio Club will sportsor the Yonkers Electronics Fair and Giant Fiea Market on Sunday, October 7, 1984, from 9:00 am to 4:00 pm, ram or Shine; at the Yonkers Municipal Parking Garage, corner oi Nepperhan Avenue and New Main Street, Yonkers NY. Admission is S2.00 each and children under 12 will be admitted free. Gates will be open to sell- ers at 8:00 am and there will be a $6.00 ad- mission per parking space whrch will also admit one (bring ^our own tables). Refresh- ments, free parking^ aod sanitary taciiities will be available, as well as uniimited free coffee. There will be live demonstrations all day and a giant auction at 3:00 pm. Talk-in on 1 46.2651/ 146.a65R of .52 direct. For more information, write Y ARC, 53 Hay- ward Street, Yonkers NY 10704, or phone )969'1053.
^^
SOUTH SIOUX CJTY NE OCT 12-13
The 3900 Club and the Sioujdand Ama- teur Radio Repealer Association will sponsor the 8th annual 3900 Club Hambo- ree and lowa State Convention on October 12-13, 1984, aii indoors at the Marina inn, South SiouK City NE. Admission to the fiea market and convention is $e.00 each. Tickets for the Saturday-night banquet (featuring spsaker Dr, Beverly Mesd of Creighton University) are $10.00 in ad- vance and $12,00 at the door. Other activi- ties will ir^cEude exhibitions, ladies' prcn grams, forums (QflP, Air Force MAf=iS, QCWA, UHFA/HF, ARRU OX session, Nov- Ice session, and a ^ QSL bureau], and a Fri- day-night get-together. Talk-in on 146.37/ 146:97. For advance flea-market reserva- tions, write Ai Smith, 3529 Douglas, Sioux City iAr and for other reservations, write Dtck Pitner, 2931 Pierce, Sioux City lA.
SYRACUSE NY OCT 13
The Radio Amateurs of Greater Syracuse 1984 i4amfest will he held on Saturday. Oc- tober 13, 1984, beginning at 9:00 am. at thte Art and Home Center Building, New York State Fairgrounds, Syracuse NY (.adjacent to Interstate 690^ [ust 3 miles southeast of the NYS Thru way, Exit 39, and one mile northwest of Syracuse and Route 81). The hamfest will have complete indoor facilities and, weather permitting, there will be an outdoor fiea market In the front courtyard. Volunteer exams will be given for Novice, Technician, and General classes. Breakfast and lunch service will be available. Com- merclai exhibitors may begin their setup on Friday from 7:30 pm to 10:00 pm and on Sat- urday from 7:00 am to 9:00 am.
MEMPHIS TN OCT 13-14
The Mid South Amateur Radio Associa- tion, the Delta Radio Ctub, and the Mem- phis Radio F^el ay Club will hold the annual Memphis Hamfest or\ October 13-14, 1984, in the air-conditioned Pipkfn Building at
TO 73 Magazine * October, 1984
the Memphis Falrgrpunds. The hours on Saturday are 6:00 am to 4:00 pm and on Sunday, 3:00 am to 2:00 pm. All activities will he held Inside and will include forums, ladies' programs, and a large flea market. Dealers' booths are S60.00 each for the weekend and flea-market tables are $5.00 each per day (there are two drive-in doors for unloading). Trailer hookups are avail- able. For special rates at nearby hoteis or for more information, write Clayton Elam K4FZJ, 28 N. Cooper, Memphis TN SSI 04, or phone {901)-274 4418 days, or {901)743 6714 evenings.
FALLS CHURCH VA OCT 13^14
Tha National Capitol DX Association will sponsor ARRL-approved DXPO '84 on October 13-14, 1984, beginning at 1:00 pm on Saturday and ending at 1:00 pmon Sun- day, at the Best Western Falls Church Inn, 8633 Arlington Boulevard (Route 50), Falls Church VA. A broad variety of DX subjects will be Included in the program. A banquet with speaker Father Moran 3N1MM wilt be held Saturday evening. For further details, contact Stuart Meyer W2GHK, DXPO Chairman, 2417 Newton Street, Vienna VA 221B0, or phone (703)-525-6286 (office) or (703)28 1-3806 (home).
LIMA OH OCT 14
The Lima Hamfest wtll be held on Octo- ber 14, 1984, at the Allen Country Fair- grounds, at the intersection of t-75 and Routes 309 and 117, Lima OH. Tickets are $3.00 in advance and £3.50 at the door; full tables are $6.00 and half tables are $3,50. For more Information, tici<ets, or tables, send an SASE to KBTCF, c/o NOARC, Box 211, Lima OH 45802.
PAf^AMUS m OCT 14
The Bergen ara will hold a Ham Swap 'n* Sell on October 14, 1984. from 8 '00 am to 4;00 pm^ at Bergen Community College, 400 Paramus Road, Paramus NJ. There will be tallgating only; bring your own ta- bie. Admission for sellers is $4,00; buyers will be admitted free Thousands of spaces will be available. Taik-in on .79/19 and .52. For more information, write Jim Greer KK2U, 444 Berkshire Hoad, Ridge- wood NJ 07450, or phone (201)'445'2&56, evenings only,
WAUKESHA Wl OCT 14
The Kettle Moraine Radio Amateur Club will hold Its annual Ham, Computer, Video Fest on Sunday, October 14, 1984, at the Waukesha County Expo Center, Highways F and FT, Waukesha Wl. Tickets are 12.50 in advance and $3.00 at the door. Tables are $3.00 for each 4'foot length and reserva- tions will be accepted until September 24th. Since all facliities will be Indoors, the hamfest will be open rain or shine, begin- ning at B:00 am. There will t>e food avail abie and commercial exhibitors. For reserva- tions, send a check (payable) to KMRA Ciub, PO Box 41 1, Waukesha Wl 53187-
DOVER MA OCT 20
e Middlesex Amateur Radio Club wHI hold its annuat Amateur Flea ^^ari<et on Oc- tober 20, 1964, from 9:00 am to 3:00 pm, at Dover Town Hall, Dover MA. Admission is $1.00 and tables are $8.00 each. Refresh- ments and ample free parking wili be avail- able. For furthter Information, send an SASE to Irv Gelier K01N, 1450 Worcester Road, #422 A. Framingham MA 01701.
CIRCLEVILLE PA OCT 20
The Irwin Area ARA will sponsor a Swap and Shop on Saturday, October 20, 1984, at the CirclevilSe VFD. just off Ht. 30, 3.5 miles west of the Pennsylvania Turnpike, £xh 7. Talk- in on .325/.925and .52. For fur- ther information, write Don Myslewski K3CHD, 359 McMahon Road, North Hun- tingdon PA 15642. or phone (412^^8S0570.
TAMPA FL OCT 20
The Hiiisborough Amateur Radio Soci- ety (HARS) will hold its annual one-day Amateur Radio and Computer Hamfest on Saturday, October 20, 1984, from 8:00 am to BrOO pm, at the Ft. Hesterly Armory, cor- ner of Cass and Howard Streets, Tampa FL (Just south of 1-275 exit for Howard and Armenia). Donations are $3.00 in advance and $4.00 at the door. Swap4abte dona- tions are $7.00 and commercial booths are $3000 (advance registration is re- quested). Taik-in on 147.075. For advance tickets, booths, and tables, write Conrad Kibler WB4AHS, 10102 Ciiff Circle, Tampa FL 33612, or HARS, PO Box 24602, Tampa FL 33623, Or call Ralph Larkin AA4PM at (813}'Sfl4-4126.
GRAY TN OCT 20
The fourth annual Tri-Cities Hamfest will be held on Saturday, October 20, 1984, at the Appalachian Fairgrounds^ located five miles south of 1-81 on Highway 23, Gray TN. Regis I rat ton fee is $2.00. Fea- tures include a flea market, forums, and dealers. RV hookups will be available. Taik-in on 146,37/97 and 147 .87/27. For further Information, write Tri-Cities Ham- fest, PO Box 3648 CRS, Johnson City TH 37601.
CHICAGO IL OCT 21
The 3rd annual CCRL Hamfest will be held on Sunday, October 21, 1964, from 7:00 am to 2:00 pm, at American Legion Post #21 , S040 N. Clark Street, Chicago IL 60660, Ad- mission is $1.00 in advance and $i .50 at the door. Tables are $2.00 each. Tall<-in on 145.030 simplex. For more information, write f4orman Geuder KA9EZA. 6345 N. Magnolia, Apt. 1-1, Chicago iL 60660, John ibes KAOFUI, 2934 M. Mobile. Chicago IL 60634, or Frank Sonneli WB90HN. 1674 W, Hoilywood, Chicago I L 60660.
CHATTANOOGA TN OCT 27-2a
Hamfest Chattanooga and the Tennes- see State AR1=?L Convention wlil be held on October 27-28, 1984^ at a new locationi Memorial Auditorium, Oak Street, Chatta- nooga TN, Inside space will be available for dealers and flea-market vendors and e-foot tables will rent for S6,00 per day or S10.O0 for tx>th days. There wiil be new, used, and peripheral equipment, computers, hardware and software, and genuine junk in 27,000 square feet of indoor space. Ac- tivities will include forums, contests, and non-ham programs^ Amateur exams (Nov- ice through Extra) will be given on Satur- day in the West Assembly Room of the Memorial Auditorium at 8:00 am. Please send a completed 610 form with a copy of your ii cense and a check or money order for S4.00 payable to WCARS/VEC by Octo- ber 16, 1984, to: Hamfest Chattanooga, PO Box 22161. Chattanooga TN 37422. For more Information, write Hamfest Chatta- nooQa^ PO Box 3377, Chattanooga TN 37404, or phone Nila Morgan N4D0N at (404)-e20-206S.
MARION OH OCT 28
The Marlon Amateur Radio Club wlil hold its 10th annual Heart ol Ohio Ham Fiesta on Sunday, October 28, 19B4, from 0800 to 1600, at the Marlon County Fair- grounds Coliseum. Tickets are S3.00 tn ad- vance and S4.0Q at Ihe door; tabies are $5.00. Food and ptenty of parking will be available. Talk-in on 146.52 and 147.9D/.3G. For more information, tickets, or tables, contact Paul KUzer W8GAX. 393 Pole Lane Boad, Marion OH 43302.
KALAMAZOO Ml OCT 2a
The 2nd annual hamfest/electronic flea market will be held on October 28, 1984, from 9:00 am to 4:00 pm, at the Kalamazoo County Fairgrounds, Kalamazoo Mi. Ad- mission is S2 00 in advance and $2,50 at the door. Four-foot tabte spaces and table rentais are $2.50 in advance and $300 at the door (spaces with power must be re- served and paid for in advance). There are 400 spaces available and dealer setup is at 8:30 am. For more information, contact Ham 10 FM Club of Kazoo^ Ken Losey KA8RUA, 2825 Lake Street, Kalamazoo Ml 49001,
FRAMINGHAM MA OCT 28
l^
The Framingham Amateur I=<adlo Asso- ciation, inc., will hold its annual fall flea market on Sunday, October 28, 1984, be- ginning at 10:00 am, in the Framingham Civic League Building, 21 4 Concord Street (fite. 126), downtown Framingham. Ad- mis s i on i s $2.00 a nd tab I es are $ 1 0.00 (p re- registration is required). Seller setups be- gin at 8:30 am. Radio and computer gear will be featured and food wiil be available. Talii'in on .75/. 15 and .52. For more Infor- mation, contact Jon Welner K1VVC, 52 Overlook Drive, Framingham MA 01701, or phone (61 7)-877'7 166.
ALBUQUEROUE NM NOV 3
The UNM ARC and the Westslde ARC will jointly sponsor a tailgate swapfest on November 3, 1984, from 10:00 am to 2:00 pm M3T, on the UNM North Campus park ing lot, corner of University Boulevard and Tucker Avenue, Albuquerque NM. Admis- sion is free: bring your own tables as none will be furnished. Talk-in on 147.75^147. 15 MHz and 449.3M44 3 repeaters. For further information, send an SASE to Gary Bone- brake K3BI, 974 Arkansas SE, Rio Raneho MM 87124, Robert Scupp WB5YYX, 648 Marquis Drive NE, Albuquerque NM 67123. or Jay Miller WA5WHN, 4613 Jupi- ter NW, Albuquerque NM 87107, or via 3.939 MH^, 01 OOUTC daily.
WEST MOKROE LA NOV 10
Ttie Twin City Hams wiil sponsor an all- indoor hamfest on Saturday. November 10, 1984, from 9:00 am to 3:00 pm, at the Con- vention Center, N, 7th Street, West Mon- roe \-A. Features will include exams, swap tables, new-equipment dealers » and a iadies' program. Talk-in on 146.25/.&5, For more information, contact Benson Scott AE5V, 107 Con tempo, West Monroe LA 71291.
NEWMARKET ONT CAN fiOV 10
The York Region ARC will present the 8th annual Newmarket Flea Market on Saturday, November 10, 1984. tjeg inning at 0800, at the Newmarket Community
\
Center, CSvfc Drive, Newmarket (just north of Toronto). Admission ts S2,0D per person and chJJdren under 12 will be adrnitted free. Tabie rentals are S3.00 each pJus general admission and will be held only until 0800 unless payment is made in ad- vance (setup Is at 0630), Refreshments vifill be available. For table reservations (include a ctieck or money order made out to the York Region ARC^ or more informa- tion, contact Geoffrey Smith VE3KCE, 7 Johnson Road, Aurora, Ont .^ Canada LAG 2 A3, or phone (41 6)-727-6672 (evenings).
NOfiTH HAVEN CT NOV 11
The SoutTicentral Connecticut Amateur Radio Association [SCAR A) will hold its SIh annual Electronics Show and Flea Market or Sunday. November 11, 19S4, from 9:00 am to 3:00 pm, at the North Haven Recreation Center, Linsley Street^ North Haven CT. Admission is E1.50 and children under 12 accompanied by an adLfIt wi[l be admitted free. Tables are $10.00 fn advance for the main hall and $12.00 at the door. (Reservations are strongly advised.) Setup will be at 8:00 am, and for new equipment vendors, a special exhibit area with setup security arrange- men is will be made avallabfe. There will be food both at the food booth and hom a mobile cart. Features will include the latest in ham radio, computers, and elec- ironies. Talk-in on 146.01^46.61 (W1GB). For more information, directions, and res- ervations (make checks payable to SCARA), send an SASE to Tony Vanacore AK10. PO Box 81. North Haven CT 06473, or phone (203}-484-4175 (home) or (203)^ 239-5321, ejttension 31 1 (days).
7\
PENANG, MALAYSIA NOV 16-18
The Malaysian Amateur Radio Trans- mitters Society (MARTS) wil I host the 1 4th SEA NET Convention on Friday. Saturday, and Sunday, November 16-18. 1984, at the Eastern and Oriental Hotel, Penang, Ma I ay si a. Features wiii include symposiums, luncheans, tours, and rag-chewing. For more details, contact IVlalcolm West- wood, Organizing Secretary, SEANETj PO Box 13, Penang, West Malaysia.
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GREFNSBOflO NC NOV 24-25
The 41?! annual Greater Greensboro Ham- test will be heid on November 24-25, 1984, from 9:00 am to 5:00 pm, at tJie National Guard Armory, 1100 Franklin Boulevard, Greensboro NO. For advance tickets, send an SASe to Fred Redmon M4GGD, 2305 Sherwood Street, Greensboro NC 27403. For dealers' space, tables, and flea market information, contact Coy Hennfs WD4NHL at 1919^294-2641.
OAK PARK Ml NOV 25
The Oak Park High School Electronics Ciiib will hold its 15th annual Swap M Shop on Thanksgiving Sunday, November 25, 1&84, from 6:00 am to 4:00 pm, at the Oak Park High School, Oak Park Mi. The doors will open at 6:00 am. Admission is S2.00 and 8-foot tables are S6.00. Refresh- ments wlil be availabie. For more informa- tion, send an SASE to Herman Gardner, Oak Park High School, 13701 Oak Park Boulevard, Oak Park Ml 48237, or phone (3l3)-96a-2675.
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Baltimore MD 21217
I have a TRSnSOC, Kantronics software, and an MFJ TU-1224. 1 wojld like to use a Model 26 as a printer. Can anyone help?
John Gill
6000 Duda Rd.
House Springs hAO fi30£1
I need schematics, manuals, and any lips I can get for a Browning model 0N-5A osciiioscope. i will gladly pay any costs for mailing and copying, Part of the trace^ Is scrunched up on the right-hand side of tiie CHT.
Rick Wilson
&04 South German Town Rd
Chuttanoooa TN 37412
Amateur Radio Logbook program for the Radio Shack Color Computer with 32k RAM, one or two disk drives and opttonat printer^
' Tweniy-four hour clock
' Up to 1550 QSO's per disk
■ Autolog TIME, DATE, BAND and MOQE
' Instant file scan for previous QSO's
' Search by CALL, PREFIX or DATE
' Edit, update QSO/QSL information
* Seven pnntoui routines including ALPHASORT
' Complete documeniation'inciuded
dataLOG $39.00
add Sh5Q for poswge and handling
dataLOG
P.O. Box 10531 ■ Jacksonville, FL 32247
See U&t of Advert fsers on page 98
73 Magazine • Octoben 1984 71
W2NSD/1
NEVER SAY DIE
eof/tor/a/ by Wayne Green
from page 6
employees brought a mass of them*
Between the people at Byte, WGI, and WGE in Peterboroughp 111 bet there are over 500 Wayne Green people In this town of 5,000. It seems as if I get waved at and greeted by almost every other car as I putt around on my new Yamaha.
By passing along the things I have learned through the years, IVe helped at least a couple thousand people learn about publishing, electronics, and computers— and that doesn't count the readers I've influ- enced. I visited one of the com- puter publishers a few days ago only to find a solid fan who got hooked while reading 73. He claimed that my editorials pushed him to get into business— drove
hfm to it. He's worth millions today.
We're moving along to start a magazine publishing Institute as soon as we can get a building large enough to handle the proj- ect. This will be even better than the system I've used in the past, for every student will not only work at every job on a magazine (from proofreading to collecting for advertising), but will be paid for the work. They'll be working on real live publications, too, not just school stuff. No more of this Catch-22 nonsense of hav- ing to have practical experience before you can get a job that will let you get practical experience. Graduates will have a resume citing plenty of good practical professional experience.
I'm hoping to start a yearly alumni meeting at Comdex. So, if you kr^ow of anyone who has worked for me during the last 33
.VflC-ATLANJTIC AMATEUR RACiQ CLUS
NEWSLETTER OF THE MONTH
REMARCS
"AIM he news that fits, we prtnt^' sesfne an approprrate motto for REMARCS, chronicle of the MEd-Atlantic Amatejr Radio Cfub. Editor Kay Craigie KC3LM re- al (zes that no one wants to read endless minutes and committee reports month after month. After all, those who are interested in that brand of tedium can htear It all at the club meeting. In steady Kay draws upon outside sources such as Westiink, Worfdrsdio, and the W5Yt Report to fill REMARCS with truly interest- ing Information. For the purist, there are still plenty of club- and member-related articles, and Kay's subtde humor makes even the dreaded meeting announce- ment 3 pFeasure to read.
On the mechanical side, 'immaculate" sums ttitngs up. The printing is of pro- fessional quality, the pages are nicely composed, and there are no typographi- cal errors to be found. Can you say the same for your group's publication?
To enter your club's newsletter in 73's Nevs/s letter of the Month Contest, send It to 73, Pine Street, Peterborough NH 03458, Attn: Newsletter of the Month.
LETTERS
BE A VE
The American Radio Relay League Is preparing to serve as a Volunteer Ex- aminer Coordinator (VEC) In each of the 13 FCC call areas (more than one VEC may serve I n a particular area). In anticipa- tion of becoming a VEC very soon, the ARRL Is recruiting licensed Advanced-
72 73 Magazine • October, 1984
and Extra-class radio amateurs to serve as; Volunteer Examiners. Applicants are not required to be AflRL members to par- ticipate. Applicants must, however, hold a current Advanced- or Extra-class license^ have no history of iicense suspension or revocation, and be at ieast 18 years of age. The Volunteer Examiner Program covers testing for Technician-, General-, Advanced-, and Extra-class iicenses. Novice exams wlii continue to be given by
years, have ttiem get in touch. I'm having some special coffee mugs made with the logos of all our magazines as souvenirs. Who knows, I may spring for tee- shirts next year! There are lapses in my usual Yankee thrrft approach to life.
The dinner will be November t&th in Las Ve^as and I want every Wayne Green alumni who can make it to be there. As far as I know, with the exception of two people who betrayed me, one of whom is dead and the other who has completely disap- peared from the publishing and computer scene, every alumni is still a darned good friend.
And, with the Green Publish- mg Institute opening soon, think how many we'll be seeing next year! The whole computer in- dustry IS desperately in need of people with publishing experi- ence. This could help enormous- ly to improve the output of spec sheets and instruction books, give the industry much better advertising and catalogs, and so on.
So, alumni, let's get together at Comdex and celebrate! Drop me a note so I can give you de- tails. I'm looking forward to see- ing you again, even if you're working for (sob) Byte or Ziff- Davis.
$$ HOME-BREW III $$
Turn your hot solder into cofd cash! Once again, 73 is search- ing for the greatest home-brewer in the land. Ail projects have a chance to appear in 73, and the best of the best will be show- ered with fame and forty ne.
Top prize is $250. Second place is worth $100, and three runners-up will each earn $50. Of course, this is in addition to the payment every author receives for publishing in 73.
Contest Rules
1, Entries must be received by November 1, 1984.
2. To enter, write an article describing your best home-brew construction project and submit it to 73. If you haven't written for 73 before, please send an SASE for a copy of our author's
3. Here's the catch: The total cost of your project mtist be $73 or less, even if all parts were bought new. Be sure to include a detailed parts list with prices and sources.
4. Our technical staff will evaluate each project on the basis of originality, usefulness, reproduciblity, economy of design, and clarity of presentation. The decision of the judges is final.
5. All projects must be original, that is, not previously published elsewhere. There is no limit to the numt>er of projects you may enter.
6. All rights to articles purchased for publication tjecome the property of 73.
7. Mail your entries to:
73 Magazine Editorial Offices 80 Pine Street Peterborough NH 03458 Attn: Home-Brew III
Novice Examiners under the new Novice rules (97,27 (a) and (c); 97.23 (b): et ai);
Novice ffcense testing Is entjrefy separate from the Volunteer Exam^iner Program.
Under the Volunteer Examiner Rules adopted by the Commission, only Ad- vanced- and Extra-c^lass licensees may administer exam elements above the Nov- Ece level (97. 2Q (a)). Extra-ciass licensees may administer ait vk^ritten and Morse- code elements; Advanced-cJass licensees may admlr^ister only exam Etements 1A, 2, and 3 (Elements required for the Techni- cian license). And, of course, you must Ise accredited as a Volunteer Examinef by a VEC tsetore you are authcrtzed to ad- minister any upgrade examinations.
If you qualify and are mterested in par- tieipatir^g as a Volunteer Examiner with
ARRL's VE Program, please request an application by writing to Volunteer £k-
aminer Accreditation, American Radio Relay League. 225 Main Street, New- ingtonCT 06111,
Steve Place
ARRL
Newlngton CT
EARN IT
I agree with the editorial comment in June, 1964, that ham radio is in trouble. Ttiere are so many hams like my friend who upgraded a desfre to tise oiir desig- nated frequencies to a "right" to those frequencies. Ttier© is no such thing as a right. W© have to earn the use of the bands
we ooGupy. The only way I can 8M to earn them Is thrdugh the emergency service ri»jle. I can't ^oe how we can do it ihraugh our advances In technolof^y like we have dorve in the past. Some hams claim to t>e achrar>cing tachnoiogy through their use M ciomputerfi attached to f>eripherals for RTTY^ QW, packet, AMTOR, and whatever. In my mind those a rani advances. Any Bash graduate vvho doesn't own a solder- ing Iron can plug Ihosa &tore-t>ought boK^ togelh&f and claim he's a great in- r>ovator.
But how in the world do we start from scratch ar>d truly do some real ham-style developir^? To me Ihai is a serious ques-
tiOTL
Wtat*S the differenca t>6rween my sU* ting hkere in my shiack running my key- board on AMTOR or packet? I dtdn'l ttuild th^ss ttiin^s. f bought tham. \ feet this keytxiard operating lA not one step above gjbbenrbg on SSB. In factn I th^nX i<eyt>oard is beneath CW. particularty o<n a har>d key or my 1939 McElroy Bug! So where do I go technically on the HF bands? (Moon- bounce is sorrwthing else.)
I grant you that traffic by keytx>ard and pffntar is a gcpod ernefgency mode But damn, I can't see ^t even after I bought the Junk 10 do it. AMTOR? It's as dull as key- tM>ajd CW. Same for packet. No skill.
I'd Nhe to experiment with digital voice. I know how AT&Ts 'T Carrier'" works and their dtgitat railio works, bitt I don't krNOw how to buitd an experimefital system or where I can get parts ii I knew how to do i I, So much for my inrwvating.
Let's iesl for CW proficiency- Qoq4 idea. Let's periodically eKamme state<»f^ the-arl knowledge as well Forget this grandfather business and let's make all ticket-holders prove they deserve the^r operating ^'rights " and station license.
By definition^ Vm not a curmudgeon, but I'm In the retired bracket that you so labeled. I've had a ticket since 1940 and an Extra class since the days when the Rl made me send the 20-wpm teet on a hand key. I fike to e»eperlmantt but I do use the KISS approach.
Enough of this laHltiering. We have to protect the frequencies that we are per* mitted to use. We need the energy of the young, But 3 don't Know how to attract them. I loaned receivers to two teenagers and about three months later they gave them back and told me thai hams are no different from the CBers they talk to, Now what?
I hate to see the uiUmate loss of trie ham bands, but unless we start earning them, no equipment manufacturers' tol>by wilt save us.
Keep whting and Til try to stir up some ARES type of action out here.
K«i Uthufi f(T7E NbltMltFillaWA
SUPER
Wei J , once again I am impressed tty 73. 1 took a while to type itve code program in *'Sour^ Good to Me," June, 1984. M^ke W5VXC/1 and Rick WB5AYD did a fpreat fob or putting It togeihSf . Cof^ratulattorra to them for it They at least took the trou- ble to translate it for &otli tne Vl&2d and ttw C-64. That is not done in some maga- zine
As p«f usual my typing contained a multitude of mistakes. I listed the resutts to my printer, proofread h (I thought K and ser^t Mike a copy and asked him to tell me wttat happened. I was expecting a letter In aliout a month, t was surprised to receive a personai phone eail from Mike (and It was not even collect !^. He straightened me out on tt>e mistakes that I hAd typed in
^ See Ust t>f A^ertlsers onpBge9S
and one that I missed in the translation In hie printer When I corrected my mistakes, the program worked!
Today in the mail I received an MCI MaJI ffCMH Mike telling me what we discussed over the phone. What serviceJ
Keep bjp the good work, f have 73s dated to Septeml>er, 1968 (73 cents yet). The collection is not complete but rt is rarge. I rt^i wHh delight your petition to the FCC a> Jl Itie code, i agree wUh you on your sti ■ J On the no-code iicense and the stiffer in^^ory nequiremenl.
Yoiir RUN magazirve Js on my computer Sheif . I have a Commodore 64 and a VIO20 Ihat I use (or RTTY on the HF bands. I am not active on HF now because I need to work over my HF rig, tt woet'f cooperate with me wtwn I send FTTTY tones through it I have ttie C^64 capable of RTTY through Itte Santa Fe 147,BV^ repeater. Not
much adivMy except me right now. Hope T can have someone to taik to soon.
Another of your writers deserves a large pat on the back --Jim Grubbs- I followed his articles in CotnntBnd&r Magazine. I corresponded with him via word pro- cessor and he was a great help.
Thanks for tending me youf ear (eye? J, Wayr^. Once again keep up the good work. Your people are Super.
Alan F. Kill NSBOC
Sania Fe NM
would be very helpfuL I have placed the beacon high tn the six-meter band SO a$ not to Interfere with local activity and thus It is not easily foun<J. The frequency is 50.440 and the location is Burlington, Con- necticut. QSL to K1NFE at PO Drawer M, Plainvi;ieCT0606£,
A.DePascaEeKlNFE Plainville CT
i
BECKONING BEACON
J
[
THANKS, FRANK
I have had a t>eia€on opera tionai lor over a year. The beacon is on 24 hours a day. aevefi days a week Afthough f have received many 05Ls from around the country, a lit- tie publicity of the beacoA'a freQu^tcy
I noted in your July, 1964, editorial that you have sold a tMjnch of your magazines. I sincerely hope this did not include 73, Ot at least that you will si ill retain edKorial control ovef this magazine,
I heJd a ham ticket ffom 1948 to 197&, when I let my licer^se lapse, beginning as
Improving the Kenwood TS830/930S
AsViei ctts
The above letter Is only one of many unsohcited reports pfoising the performance of Fox Tango filters in both the TS830S and the TS930S. Ifi addition our filters received faiworabJe Product Reviews m QST (9/83 and 4/S2J; were subject of major article in 73 Magazine: Stfanglg QRM wiih your TS830S (6/831; and many reports in other national publicaiions. One of the major advantages of these SS8 fillers is thai ihey so improve VBT operation as to eliminate the need (and expense) of CW filters for all but the most dedicated CW operators!
Complete tvyo-f li tcr Kits with all needed parts „„.$l70each
ORDER: FTK830 or FTK930 t2/lkH; Bandwidth for SSB and CW) FTK830 or FTK930 (400 Hi Bandwidth for CW Only! SPECIFY Rig and Bandwidth desired when ordering [fWaiJ or Phone] SHIPPING: Surface $3, Air $5 [COD and Si], Overseas SIO. FL Residents 5% Sales Taac
FOX TANGO CORPORATION,
TELEPHONE (305^683-9587
Box 15944, W. Palm Beach, FL 33416 "^
73 Magazine • October, 1984 73
Chief Operator of XAFQ/Trieste, than W5PVE, W2MJF, WaWUN, and W4U0. I intend to get my code spe#d back up a bit— I once could copy 35 wpm soJJd with a stick, but righl novi^ 10 wpm poses a bit of difficulty. V\\ brush up on theory and take the exam again tor a Generai-class ticket. Then t shall be QRP on CW from 40 through 10. In 1949, I put K4WAR^A4WAR on the air with separate kWs on aU band^ and a nice antenna farm at Camp (now Fort) Gordon GA. I had some patents Issued during the 1950s resulting from electronics design for missile guidance in the t950s, and from 1955 to mid-t959, I was first a Project Engineer and then a Se- nior Engineer with Heath Company, Ben- ton Harbor Ml,
in fact, I once sold you a short story, "Ed McGurk Makes WAS on Two Meters," which appeared in CQ in Decemt>er, 1955, when you had that magazine—and It was &■ good tnagazine then, too. Incidentaiiy. I received $35.00 for the stofy and Pappy Lynn got S50.00 for the cartoon IHustrat- \nQit\ Maybe I should have been an artist!
Sorry about the reminiscing. What I really started to say was thai some months ago I subscribed to QST, CQ. and 73i t am letting my subscriptions to QST and CQ run out, but I'm definitely keeping 7$ because it seems to be the best ham magazine among the three at present. I particularly like the constrijction articles, but then, I like most everything else In the magazine, too. CO isn't totally a loss, but OST Is a far cry from the great magazine it was in the MOs "SOs, and '60s, and def inhte- ly not worth the price anymore^ to my way of thinking.
I was unaware that you were a Mensan until I noted your name In the Register a tew years ago. I finaEfy got around to Joifii- fng She group In 1973 and am stHI a member.
Anyway, whatever you do, don t let 73 go the way of the other ham rags— I sill I have about a year to go on my subscrip- tion, and intend to renew.
J, jFrank Brumbaugh fifadenton FL
CRISIS
I enjoyed your editoria( in the June Issue of 73 very much, Like your other edi- torials, it was a breath of fresh air com- pared to the usual vapid commentaries found in other publications. I completely agree with your comments about Morse code, I have on occasion "road the mail'* (a most curious expression) on traffic nets on 3 meters and HF (more on the former) and have been totally ams^ed at how com- pletely useless and boring It ail sounds. In short, your conclusions about the present state of amateur radio are correct, in my opinion.
With the essentials of your argument granted, what can be done to correct the problem? I think \t would be useless to go to the ARRL about upgrading the current state of radio technology since they ap- pear to be the bastion of outmoded tech- nology. Wiiat other groups in ham radio exist that are interested along these lines, and which coufd be used to bypass the in- tellectuai ballast residing at the ARRL? [This Is ciearfy, in my opinion, the only course open,)
Finally, are the normal emergency ser- vices (i.e., police, fire, civil defense, Red Cross, and National Guard} willing to in^ terconnect with amateur radio? Or do they view amateur radio as compietely useless {perhaps with Justification)? These are just some of the questions that need to be answered. Can you suggest where I might look?
74 73 Magazine • October, 1 984
There Is one point that you made which Is in error I do not tteiieve that there are more technical graduates In Japan be- cause they have a no-code license. What motivates an indivldoal to go into a partic- ular work? Interest in that f ieid and the be- lief that it Is worthwhile. If a person is taught that scientific and industrial prog- ress (or progress alone for that matter) is good, then, If he has the interest, he'll choose such a career. But if (as he is taught in the US today) he Is taught that scientific and industrial progress is evil, that reason Is impotent, etc., then he will not go into those areas, even if he has the interest! After all, why become an engi- near when objectivity is impossible and there are more important social concerns (I don*t agree with either idea). Thus^ this crisis (i.e., lack ot young technical people) Is Just the tip of a larger philosophical cri- sis, in my opmion! It is a mistake to view it in any other way.
Jap^n, for the most part (as witness their expansion In reason oriented areas), does not suffer to the same e;ctent from this philosophical crisis, i believe that the Japanese have a better grasp of the es- sentials of this issue and are doing better, which is why they have a no-code license (i.e., the no-code ilceose is a result and not a cause).
Thank you and keep up the good work!
Chris O'Hara NICI^A Fairfiefd CT 0B432
The bankruptcy of amateur radio is stftf a weif-k^pt secret. Having worked on NfAC With representatives of the oitjer commu- nications setvic&s, f Can assure you that word has not yet feaked out as to the di- saster we've generated and we wilt stiii g&t fuii cooperation. — Wayne.
SOFTWARE PIRACY
There Is a problem in the amateur-radio fraternity. ..software piracy; Whether by Ignorance or simple disregard for the law, many amateurs are stealing copyrighted programs. Most do not consider their theft a crime or a serious probiem^ but unless this practice is discontinued, amateur radio will suffer.
With the influx of computers into I he hobby, a degree of software piracy was in- evitable. UnfortLfnately, the problem has become a blemish on amateur radio. Thousands of dollars have been spent in litigation involving software piracy out- side the hobby, and 1 had hoped amateur radio would police the problem internaHy and not require legal action. Sadly this Is not the case.
I recently confronted two hamfest exhibi- tors who were selling copies of a Kantron- ics program. These people were copying and selling our programs to any amateur wiliing to pay the price, I bought one of the programs for evidence and informed the seller that legal action would be taken, This person was not a ham^ but those buy- ing the programs were. We have several other examples of programs copied and sold.
There are a few simple steps we can all take as those interested in seeing the problem solved:
1. Never buy copied software.
2. Report pirates to the software manu- facturer.
3. Don't allow illegal sales at your local hamfest.
KantroniGS plans to prosecute those who steal our programs, as we have In the past. But without the assistance of the en- tire amateur community, the manufactur- ers will not be able to stop pirates from stealing their profits. If manufacturers are
not able to sell enough product to make a
profits other new and improved programs will not be written. Don't let the greed of a few deny the hobby of future expansion. Let's throw the bad apples out before they ruin the whole barrel.
Mike Forsyth
Marketing Directoi^
Kantronics, Inc.
SHARING [DEAS
]
"Per f board and BofdertsV?'\ which ap- peared to the Juiy, 1984, issue of 73, has brought some wefcome correspor^denoe. The ietters below add some impori^nt Ideas to those tn the article. More impor- tantfY, they illustrate one of the most im- portant /deas in ham radio: the wHfing- ness to share freely experience and ideas that might help other hams. I want to thank both gentlemen for writing and for adding to my own stock of constwctlon Ideas. No one knows everything, and perhaps it is even true that none ot us knows very much. But together, we know a lot of very usefitl things about many matters.— L fl. Cebik W4FiNL
I read your article In 73 for July, 1984, " Pe rf board and SoidertatI?"', with Inter- est. I have been a ham for over 40 years and have constructed countless projects. The ideas you described are good, and I pici^ed up a few new thoughts from your text. I*w1any thanks!
Vm writing to pass along a few tips that 1 have found helpful, in the hopes that you can use them, too. Here they a re I
Cutting perf board and PC material Is easy to do without sawing. If you score both sides heavily (1 take a couple of passes per side with the board held flat on an old magazine, using a heavy razor knife from the hardware store— the kind of knife that has replaceable blades— f use one made by Millers Falls that stores the blades irr the heavy aluminum handle), it will break cleanly along the score. It hard- ly even needs touch up with a file for neat- ness, but that is a good finishing touch. I find it much easier than sawing^ and I have never had a split or chip.
You are rtghE about pencEl marks oays- Ing leakage paths with CMOS circuits. Another maddening cause ot the same thing Is solder flux, which causes a prob- lem when the humidity is high. The only cure I have found is to use a commercial flux remover on the board (Radio Shack's is OK). Isopropyi alcohol does not work well and sometimes makes the problem worse due to Its water conient.
Forming leads on small parts can be done beautifully with a small pair of "Chain-nose" pliers. Available in good hardware stores and hobby shops, the jaws have circular cross section. They are not really as suited for gripping as regular pliers, but they do a swell job of forming nicely rounded bends, I think they were originally designed to make small chain links.
I also find it very helpful to keep one of those tapered red-plastic lead formers handy, to get the exact lead spacing on re- sistors, etc. I think you can get them from Radio Shack, but I have had mine so long, I am not sure.
I have had problems drilling large holes, say, over about 3/16 inch. I find the board often cracks It the hole is near an edge. I have been using two reamers instead. One is a regular T-handle 1/S-to-1 /2-inch si2e, and the other is a mod el -maker's reamer (from Brook stone) (hat goes from almost nothing to about 1/8 Inch, Pert- t>oard materiail is so soft that you can
often ream a super quality hole Taster
than setting up to drill it. It also is a good solution for that hole size tor which you don't have a drill.
When mounting a PC or perf board par- allel to the chassis surface, 1 always have (It seems) minor problems getting all holes to line up. it seems to work tjetter for me to not use4-point mounting (mounts in the corners), but to use 3-point mounting instead. Generally, when things don't quite line up, only one hole need be moved. Three points determine a plane, and it works well for me,
A really neat way to mount boards, when you are pretty sure the debugging phase Is over, is to mount them parallel to the front panel, supported on the front- panel controls. For example ^ if you have a couple of switches and a pot it usually is possible to arrange the parts so that se- lee ted surfaces are equidistant from the panel surface. You can either epoxy (if you are really suref) the board to the controls (such as to the back surface of a pot) or (better) solder the lugs of the switches to pads on the PC board through small ac- cess holes. It sounds cumbersome, but it often can be done and leads to a reaily nice looking arrangement. On oocasi on ^ I have used this technique by soldering heavier-than-usual leads on the panel controls (#16 or #18 wire) and passing these leads through the perf- or PC board, soldering them to pads. etc. With several such leads, the whole thing Is surprisingly sturdy. The rest of the chassis is yours to do with as you like — it is like free addition- al space!
When using quite thin wire (such as wire- wrap wire), if the long runs are left quite loose, after the job ^s done, It can be made to look neater by pulling a loop of the long lead through an unused hole on the perf board, just to tighten up the lead. Judicious selection of the "stitch" hole can also restore those right-angle bends to otherwise diagonal runs.
A super easy way to make PC boards from articles when you wish to etch the board conductors Is to do the job back- wards. Instead of etching and then drill- ing, make a photocopy of the t>oafd from the magazine and scotch tape it to the PC- board. Using a small drill (I really prefer the hand-held battery powered jobs; they are easier to control and more convenient than a big drr 1 1 or a Dremet tool, unless you have a permanent shop setup), drill right through the photocopy and your PCi boards until all holes are in place. Then re- move Ehe photocopy, deburr as neces- sary, and scrub the copper surface in the kitcl^en sink using SOS scouring wool. When the copper Is bright, rinse It and l^eave the tiniest trace of regular dish- washing detergent on the surface. It will cause etch-resist pens to write beautiful- ly. With little effort and practice, you can draw the conductors; you can even make a hybrid arrangement with some prepared wax patterns. IC pads, If you wish. It is also your golden opportunity to add your name, call, date, revision number, or what- ever. After the board is etched, a little cleaning Is all you need before stuffing. Try It, you1l like 111
As I said, I enjoyed your article and hope you find one or more of my ideas to be helpful, too-
Warren Oftutt AF9Q Geneva IL
I read your article in 73 on perfboard construction practice. Very thorough, but I would like to add my two cents:
I have gravitated away from using phe- nolic perfboard because it is so fragife and doesn't have a high enough insula- tion resistance for ^ome high-impedance
circuits. The same goes for epo)(y paper. The'^ are mcristure sensfttve.
f prefer to use GlO or Ffl4 (or sfmflar) epoxyfibergfass pedboard. One source is Vector P pattern, available from industrial electrorrjcs parts houses. It ts easily cut by scoring it on both sides with a utility l^nife held against a straightedge, oi amp- in g the part rn a vise or between a tabletop edge and a rigid sheet of metal, etc., and then giving it a "karate chop" to get a dean break. The extra expense of the pre- mium pert board is weN woftti it in avoid- ing duplication of effort if the circuit is dropped or doesn't work right.
I have even used G10 perf board for rf
circuits. Vector seKs a version with con- tinuous copper on both sides, isoi^tted pad "cool^ie cutters'' are then used to de- velop a drcuit^ These tools are available from Vector or A, F. Stahisr (if they &te still Jfi business^. Stabler parts were carried by
TrumbLjii (if he is stilj In business), i be- lieve I bought a "bubbie etcher" from Trumbuii a while ago, but i have mistald It because [ have moved several limes sinoe^ i would iike to locate Trumbuii again or someone who has taken over the line, i use perf board for breadtKiards and prototypes, and PC for Mnished models if it is worth the effort. Two usefui tools for working epoxy-
glass perf board are a "nibbfing tool" (to cut irregularly shaped hoies) and a ''ta- pered reamer" (to enlarge round holes drilled with a hand-twist driiJ ohuok|. These are available from Sears, Radio Shack, etc.
I agree that it is wise to socket all semf- conductors in a breadboard. AJsOh those threaded metal spacers fMouser? et aij are very useful to aid in mounting. Mask- ing tape and a bati-point pen can provide labels of important circuit tap points. Wir- ing going off the perfboard should be stranded/insulated, but solid insulated will work onboard.
Vtfell, thaf 3 alM have to rebate, now. I am
not a ham yet but am an efectrical engi- neer in telecommunications circuit de- sign. I am working towards a Technician's ficense because I got interested in home- brew microwave and satellite TV linlis and need a ticket to transmit. MDS downcon- verters can be used on 2304 UHz.
Keep up the good work. With much of eiectronic technology going to Japan, it is difficult for a new engineer to gain practi- cal experience. Ham radio is a usefui thing to an American technician or engi- neer wishing to hone his skills.
Raymontd Barcklow, Jr. Coiumbta SC
AWARDS
am Gosney KE7C MIcro-dO, inc. 2865 Nofth Busb^ Road Oak Harbor WA 98277
WORLDWIDE AWARDS OmECTORY
If you like to go after awards or win con- tests, this directory is a must! Volume 1 lists over ^^t) awards from ail over the world with names and addresses, costs,^ and descriptions. $9-95 brings Volume 1 to your doorstep. Volume 2 is in produc- tion now and wiii cost $5.95 for an addi tional 13C awards. Why not order Volumes 1 and 2 for a combined price of $12.75? The Wortdwide Awards Diwotory is for the amateur radio operator who is interested in showing his proficiency at radio com- munications to others throughout the world. Vou will never know how easy it Is uniess you know how to go about it. You probably already have enough QSLs in your files for some of the awards. S9.95 in- cludes all postage and handling. COD ex- tra. Quantity discounts available.
A)sOt if you know some awards that you would iike ilsted, please Eet Larry know and they will appear in the next volume, Write to; Larry Kebel KB^ZP, 736 39th Street, West Des Moines lA 50265.
INLAND STEEL ARA
The Inland Steel Amateur Radio Asso- ciation will operate speciaE-event station K9DWL to commemorate The Lit tie Red School House and Hammond, Indiana's centennial year, from 1400Z to WOOZ on Saturday, October 6, 1&B4. Frequencies: phone— General-class portions of 10, 15. 40, and 80 meters; CW— Novice-class por- tions of 10, 15, 40, and BO meters; 2 meter FM— 146.42 simpJex, Send tegai-size SASE for certificate to Lucy Schendera N9DTG, 812 E. 40th Place, Griffith IN 46319.
ST. PETERS ARC
The St. Peters Amateur Radio Club will operate a special -event station from 1700 UTC. Saturday, October 6, to 1700 UTC, October 7, at the Daniei Boone Home, Fernme Osage Valley, St. Charles County, Missouri. The event is to commemorate the place where Daniel Boone; frontiers- man, judge, trapper, surveyor, builder, and family man, spent the last twenty years of his life. The weekend ceiet>ration features a biack powder marksman contest for lo- cal participants. One compiete 2- way con- tact is needed to obtain a presentation-
quality certificate on aged parchment fea- turina a picture of the Boone Estate and an Information brochure of Boone facts. SPARC will operate KB«J on plus or mi- nus 3.915, 7,240, 14,280^ 21.420 depending on conditions and band activities. A coon- sitin cap will aJso be awarded to the first operator making contact on all four bands. One dollar or 3 iRCs with calls and time of contact should be sent to Tfm Haake WAOTSY, 128 Lake Point Drive. St, Peters MO 6337e,
CENTER OF THE US
The Centrai Kansas ARC of Salina KS
wiii operate WaKQU from the marker of the geographical center of the US in Leba^^ non KS. Operation will be from 1700Z Cto- tober 6 till 1900Z October 7, 10 kHz up from the lower end of the Generai-cfass 10-80-meter bands. Certificate via KB®BH, 2358 Aurora Ave.^ Sailna KS 67401.
:??
COLUMBUS DAY
The Columbus Amateur Radio Associa- tion will be holding its second annual Co- lumbus Day Special Event to provide a tr i^ pie salute to Christopher Coiombus, the City of Columbus, and amateur radio worldwide, on October 6-7, 1964. CARA's c^ub static n^ WSTO, located at the Center of Science and industry, will try to contact as many stations as possibie around the world.
EUgiblHty
Open to all amateur-radio operators worldwide, to be divided into two groups: Columbus OH (and suburbs) amateurs; all other amateurs.
Bands
Saturday. October 6, I9fi4— 1400Z to 24002—15 meters phone at 21.375 MHz ±10kHZ-
Sunday, October 7, 1984— 1400Z to 2400Z— 40 meters phone at 7.240 IV* Hz ±10 kHz.
Exchange
Name, QTH, and HST.
Scoring
One point for each contact (excluding WSTO), ^ix points for a W8TO contact. A final score of 10 must be submitted to be eiigible for a certificate. Scores must be sut)mitted within 120 days to be valid. Cer- tificates will be issued to ail qualifying amateurs who Include an SASE {SAE and 3 IRCs for DX). SWLs may receive the cer- tificate on a St at ion- heard basis.
A mini contest will be in operation dur*
Ing the event period; the highest score from a Columbus amateur will receive a plaque.
Ail requests for certificates and corre- spondence should be sent to Amateur Radio Station W8T0, Attn. SpeciahEvent Coordinator^ 2&0 East Broad St., Colum- bus OH 42^15. f /
CENTER OF US POPULATION
The Jefferson County Amateur Radio Club will be operating special-event sta^ tion KAOIAR from De Soto MO, the center of US population^ on jQiiitob^ J5i^9Q4, from 1500Zto240OZ,'^
Operation will be in the lower ends of the 40-, 20-, and 15-meter General bands. There will be some CW in the Novice por- tion oM he same bands.
For a certificate, send an SASE and OSL to KAQIAR, aOCfd High Ridge Boule- vard, High Ridge WO 63049.
/^ HAT ROCK
The Hermiston Amateur Radio Club will operate KC7LK from Hat Rock State Park from laOO GMT. October 13th, to 0100 GMT, October I4th, and between 1800 and 2200 GMT on October 14th. The station is commemorating the 179th anniversary of Lewis and Clark's visit to Hat Rock and wiii be operating in coniunotlon with the Oregon OSO party.
Operation will be on the General phone and Novice CW bands. There will also be some 2-meter and 440'MHz operation. For a certificate, send on SASE and your con- tact number to the Hermiston Amateur Radio Giub, PC Box 962, Hermiston OR 97838.
QUEEN CITY
The Clarksville Amateur Transmitting Society will be operating a special -event station celebrating the aooth anniversary ot Clarksviite TN, the Queen City on the Cumberland River, The dates and times are as follows: October 13, 1984, from 14CK)Z to 2400Z and October 14, 1984, from ie00Zto2200Z The call of this station will be N4GMT, Modes of operation will be SSB^ CW, and RTFY. Frequencies of oper- ation will be around 21,37& MH^;, 14 280 MHz, and 7.240 MHz. A commemorative QSL certificate will be sent for every SASE received. QSL via KB4EFW, Rt. 1 Bo3< 162A, Indian Mound TN 37079.
SUNBELT AGRICULTURAL EXPO
The Colquitt County Ham Radio Society win be operating club station WD4K0W trom the site of the seventh annual Sun- belt Agricultural Exposition on October 16, 17, and 16, 1984. The hours of opera- tion will be 0900 to 1700 EDST each day.
This annual Sunbelt Expo is held each year at Spence Field Airbase, located near MouEtrie, Georgia, and is the largest agri- cultural show In the South. This event
draws over 200,000 visitors from all over the United States and foreign countries.
Operations will be in the General por- tion of the HF bands. The members will al- so be listening for visiting hams on the lo- cal repeater 146. 19/. 79. Visiting hams are invited to visit the amateur booth at the Expo and operate the amateur station.
A special OSL card is available for those making contact during this event and submitting an SASE.
J. GORDON COOGLER POETRY FESTIVAL
On Saturday, Novembers. 1984, K4MJN will operate a spec iai-e vent station in Biythewood SC to commemorate the birth- place of J. Gordon Coogler [1865-1901).
J. Gordon Coogier has been acclaimed by literary critics as the WORST practic- ing poet in US literary history' His verses are now known as Cooglerisms, as is any other worl< since that falls into that same critical disdain. Many literary societies of today award the Coogier Award for the worst published works of the year. But here in Biythewood ^Population 93J we're very proud of our native son and celebrate his accomplishments with a festival and poetry contest,
K4MJN Will operate on or around 14.290 MHz from 1 400Z to 1 BOtJZ a n d on or arou n d 21.390 MHz from 1800Z to 2200Z Join usi
Alt stations world ng K4MJN during this second annual festival will receive ahand- sorne certificate with a photo of The Bard of Biythewood and some of his poetry. Send a large business-size SASE with your QSL and contact number to J. David Suggs K4MJN, Rf. 3, Sox 164, Biythewood SC 29016.
BOMB SQUAD
The BOMB Squad |Best of Mt. Baidy) win operate W6HCP (HoHywood Christ- mas Parade) from 16002 on November 25 to 0400Z on November 26, 19&4. Operation from the parade communications center of the 1934 Hollywood Christmas Parade will be on 7.284, 14.284, and 2T284 MHi. SSB. SASE to W6GVH for special com^ memorative QSL.
WORKED ALL ZONES
The WAZ Award is issued to any licensed amateur station presenting proof of con- tact with the forty zones of the world. This proof shall consist of proper QSL cards j which may be checked by any of the au- thori^d CO checkpoints or sent directly to Mr. Leo Haijsman W4KA, WAZ Award Manager, 1044 Southeast 43rd St., Cape Coral FL 33904. Many of the major DX clubs in the US and Canada and most na- tional amateur radio societies abroad are authorized CQ checkpoints. If In doubts consult the WAZ Award Manager. Any legal type of emission may be used, pro- viding communication was established after November 15, 1945.
73 Magazine * October, 1984 75
The off^ciat CQ WAZ zone map and zone Kst will be used in determining the zone in which a station is localgd.
Confirmatfon must be accompanied by a fist of claimed zones using CQ form 1479, showing the cail letter's of the sta- tion Contacted within ^ach zone. The list should aiso deafly stiow tiie applicant's name, call letters, and the complete mail- ing address. Tlie applicant should indi- cate the type of award for which he is ap- plying, such as all-SSB, all-CW, or mixed, fn remote locations and in foreign coun- tries, a handwritten list may be submitted and will be accepted for process log, pro- vided the above information is shown,
All contacts must be made with licensed^ Fan d based, amateur stations operating in authorised amateur bands.
All contacts submitted by the applicant myst be made from within the same coun- try. l\ IS recommended that each QSL clearly show the station's sone number, When the applicant submits cards for muJtiple calistgns, evidence should be provided to show that he or she also held those call letters.
Any altered or forged confirmations wfH result in permanent disqualification of the applicant.
Inctude with the appilcatfon the pro- cessing fee {CO subscribers — S4.0O; non- Subscribers— $10.00) and a self -addressed envelope with sufficient postage stamps or IRCs to return the QSL cards by the class of maii desired and indicated. CQ subscribers should include a recent mail- ing 1al>el (or copy) with appiicatfon. IRCs equal In redemption value to the process- ing tee are acceptable^ Checks should be made out to Mr. Leo Hai|sman, WAZ Award Manager.
In addition to the conventional certifi-
cate for which any and all bands and modes may be used, specially endorsed and numbered certificates are available for phone and single-sideband operation. The phone certificate requires that all con- tacts be two-way phone; the SSB certifi- cate requires that all contacts be two-way SSB.
If, at the time of the original application^ a note Is made pertaining to the possibili- ty of a subsequent application for an en- dorsement or special certificate, only the missing confirmations recfuired for that endorsement need be submitted with the later application (provided a copy of the original authorization signed by the WAZ manager is enclosed).
Decisions of the CQ DX Awards Adviso- ry Committee on any matter pertaining to the administration of this award will be final.
Ail appfications should be sent to the WAZ Award Manager after the QSL cards have been checked by an authorised CO checkpoint.
Zone maps, printed ruies, and applica- tion forms are available from the WAZ Award Manager: Send a self-addressed envelope (4" x 9-1/2") with 28 cents post- age, or a self-addressed envelope and 2 IRCs. For rulings on borderline areaSn con- sult the WAZ Award Manager,
Single Band WAZ
Since January 1, 1973, WAZ Awards have been issued to licensed amateur sta- tions presenting proof ot contact with the 40 zones of the world on one of the tlve high-frequency bands, 30-10 rneters. Con- tacts tor a single-band WAZ award must have been made after QQQQ hours GMT, January 1, 1973, Proof of contact shall consist of proper QSL cards checked by
the DX Editor, the WAZ Manager, or an au thorlzed CO checkpoint. Single-band cer- tificates will be awarded For both two-way phone (Including SSB) and two-way CW. The single-band WAZ program is governed by the same rules and uses the same zone boundaries as the regular WAZ Award-
5 BarnJ WAZ
On January 1, 1979. the CQ DX Depart- ment, In cooperation wEth the CQ DX Advi- sory Committee, announced the 5 band WA21
Applicants who succeed in presenting proof of contact with the 40 zones of the world on the five high-frequency bands — SO, 40, 20, 15, and 10 meters |for a tot a! of 200) — win receive a special certiificate in recognition of this achievement.
These rufes were in effect as of July i^ 1979, and supercede all other rutes. Five- band WAZ will be offered for any combina- tion of CW, SSB. phone, or RTTY contacts, mixed mode only. Separate awards wiEl not be offered for the different modes. Contacts mifst have been made after 0000 hours GMT, January 1, 1979- Proof of con- tact shall consist only of proper OSL cards checked by the WAZ Award Manag- er. The first pEateau wiM be a total of 150 zones on a combination of the five bands. Applicants should use a separate sheet for each frequency band, using CQ form 1479.
A regular WAZ or single-band WAZ wfll not be a prerequisite for a 5-band WAZ cer tificate. All applications should show the applicant's WAZ number.
After the ISO-zone certificate is earned, the final ob|ective is 200 zones for a com- plete 5-band WAZ. CQ is donati ng plaques for the first 5 winners, after which the ap- plicant will have a choice of paying a fee
|
ISLAND DX COUNTRY immO |
|||
|
A3 |
HK9 (Bajo) |
PYO (Vfm\) |
VS6 |
|
A9X |
HK0 (Maip^ |
S7 |
VS9 (See 8Q) |
|
BV |
HKtS (San An) |
S9, cm |
VS9K |
|
C2 |
IS |
SV Crete) |
VU7 (Andaman) |
|
C6 |
J3, VP2G |
SV (Dodecan) |
VU7 (Ucca) |
|
ce^A |
J6, VP2L |
T3, VR1 (Central Kiribati) |
XF4 |
|
CEtBX |
J7,VP2D |
T3,VR1 (East Kiflbeti) |
XP(SeeO>q |
|
CEfflZ |
JA-JR, KA |
T3,VR1 (West Kiribati) |
YB, YC, YD |
|
CO, CM, KG4 |
JO. KA1 (f^ina) |
IF |
YJ |
|
CT2 |
JO, KA1 (Ogasa) |
TI9 |
YVO |
|
CT3 |
JD, 7J1 (Okino) |
UAI.kiKI (Franz Jos) |
ZD? |
|
D4 |
JW |
VE1 (Sabte) |
ZD8 |
|
D6 |
JX |
VE1 (St Paul) |
ZD9 |
|
DO |
KG4 (See CO, CM) |
VK(LordHowel |
ZF |
|
EA6 |
KHI.KB |
VK9 (Willis) |
ZK1 (North) |
|
EA8 |
KH2, KG6 |
VKfl (Christmas) |
ZK1 (South) |
|
EL Gl |
KH3. KJ |
VK9 (Cocos) |
2K2 |
|
FB8W |
KH4p KM |
VK9 (Mellish) |
ZL(New Zealand) |
|
F8&X |
KH5, KP6 (King) |
VK9 {Norfolk) |
ZL(Auck-Camp) |
|
FB8Z |
KH5, KP6 (Paimyfa) |
VK0 (Heard) |
71 (Chatham) |
|
FC |
KH6,AH6,WH6, NH6(Haw) |
VKQ) (^flacquarie) |
ZL (Kerm) |
|
FG fGuad) |
nm. KH7 (Kure) |
VP2A |
ZM7 |
|
FG, FS |
KH8, KS6 |
VP20 (See J7) |
ZS2 (Mari-Pr Ed) |
|
FH8 |
KH9, KW |
VP2E |
IS |
|
FK |
KHffl, KH2, KG6 (Mari) |
VP2G(SeeJ3) |
3B6/3a7 |
|
FM |
KC6 (West) |
VP2K |
3B8 |
|
FO(Clipperton) |
KCe(East) |
VP2L (See J6) |
3B9 |
|
FO(Tahhtij |
KP (Desoth) |
VP2M |
3C(S |
|
FP |
KP1, KC4 (Navassa) |
VP2S |
3D2 i |
|
FR^GIor.) |
KP2, KV |
VP2V |
3Y |
|
FR (Juan) |
KP3, KS4, HKa (RanSer) |
VPS |
4S |
|
FR (Reunton) |
KP4, NP4 (Puerto RIco) |
VPB (Falkland) |
5B.ZC |
|
FR (TromlEn) |
KX |
VPa, LU (Orkney) |
SR |
|
FW |
om |
Vpe, LU (Sandw(ch) |
SW |
|
G, QM, GW [G Brit) |
oja |
VPS, LU (Shetland) |
fiV |
|
GC. GU (Guern) |
OX,XP |
VPB, LU (Georgia) |
80. VS9 |
|
GC. GJ (Jerseyl |
ov |
VP9 |
BP |
|
CD |
P29 |
VQ9 |
9H |
|
Gl, El |
PJ (Neth Ant) |
VR1 (See T3) |
OMB, gMS (See VS5) |
|
H4, VR4 |
PJ (St Maarten) |
VR4 (See H4) |
9V |
|
HCS |
PY® (Fern) |
VR7 |
9Y |
|
HH, HI |
PYa fPetef-Paul) |
VS5, 9M6, 9M8 |
for his plaque and/or applying for an en- dorse men I commemo rating this achieve- ment.
The applications should be sent to the WAZ Aw^ard }^anager. The 5-band Award Is governed by the same basic rules as the regular WAZ and uses the same zone boundaries.
PETERBOROUGH ARC
The Peterborough (Ontario) Amateur
Radio Club is offering a distinctive bicen- tennial certificate to amateurs contacting Peterborough amateur stations during 1984. Ontario stations must contact five Peterborough amateurs, North American stations must contact two^ and DX sta- tions must contact one. Use any Ijand, any mode.
Send 51 and a list ot contacts as well as date and time of contact (no QSLs re- quired) to: Peterborough Amateuf Radio Club, PO Box 1205, Peterborough, Ontario K9J 7H4,
ISLAND DX AWARD
The iDX Award, sponsored by the Whid- bey Island DX Club, Is one of the most sought after awards in the DX communKy. Thfs award is available to licensed ama- teurs and shortwave listeners woridwide.
The IDX Award is issued for SSB, CW, RTTY, SQTV, and mixed mode, as well: as for mixed- and single-band accomplish- menls. Applicants must work fifty (50) IDX Islands for ^he basic award. Endorse- ments are given in increments of 50 is- lands^ up to and Including the maximum number of islands possible.
Only DXCC countrtes which are bona fi:de "islands" are qualifying contacts. A special IDX listEng appears wilhin this col- umn. To be valid, all contacts must have been made after October l, 1977,
To apply, prepare a list of qualifying oontacts in prefix order. Please r^umber your contacts 1 through 50, etc. Include the call of the station worked, IDX island name, band, mode, date, and CMT.
Do not send QSL cards! Have your lis! verified by two amateurs or local radio- club officials. Confirmation of each con- tact must be in the applicant's posses- sion al the time it is being verified. Send list of contacts along with $4 in US funds only and a business-size SASE to the fol- lowing address (foreign stations may sub- stitute £D IRCs for the fee): Whrdbey is- land DX Club, Attn: IDX Award, 2665 North Busby Road, Oak Harbof WA 98277.
Rules governing this award program are rev le wed annually in the month of Sep- tember, Please enclose an SASE with any enquiries regarding this award program.
Ttie IDX Awards Program uses DXCC countries which are bona fide "isiands" as recognized by the National Geographic Society. The first criterion is !hat each must have been a DXCC country on or af- ter October 1, 1977, as stated on the DXCC List of the ARRL Any 'qualifying'^ DXCC country omitted from this list by error or Vi/hich has been recognized for DXGC after the release of this listing will be added the next lime it goes to press, in the mean- time, appilcanls may count the new coun- tries In their taiiy.
HAROAA AWARDS
These awards are of high quality and will make a very nice addition to any radio room. The awards are available to all 11* censed amateurs and amateur stations;^ Please do not send QSL cards. A list Showing full details oi the contacts (log information) should be certified by one other amateur or radio-club officer. Photo- copies of your QSL cards or original log wfll also be permitted. At your request.
76 7S Magazine • October, 1984
special endorsements wifT be added such as: CW, SSB, ail YL, QRP, RTTY, SSTV, one bandf etc. If you so desire^ you may re- Quest separate awards for each spec fat endorsement Contacts may be made over any period of years. Contacts made through repealers cannot be used. Satel- lites are permitted. Please pass this award infofmatton along to another ama- teuf or post it at your local c tub. All corre- spondence or appFtcatlons should be ^ent to: HAROAA, PO Box 341, HinckJey OH 44233, Attn: Awards Manager Gary Zim- merman WB8RTR.
Applica^lion for each award must be ac- companied by three US dollars to cover handJing and award costs. Payment may be made by cash, personal check, money order, ten IPCs, or first-class-rate US post- age stamps. DX applicants may send a money order made out in US funds, ten IRCSf or any of the above.
If at any tJme your award is fost, mis- placed, or damaged in any way, send the •date, award number, and pertinent infor- mat I on and we will replace it free of charge. Alii awards Include the speci^at HAROAA gold seal.
Great Lakes Award
This requires one contact with each Stat© bordering the Great Lakes: New York, Pennsylvania, Ohio, Michigan, In- diana, Illinois, Wisconsin, and Minnesota,
Sup^r Certificate Hunter Award
This HAROAA award is designed for the serious certificate hunter. To earn this award, you must have a mtnrmum of tenj amateur-radjo operattng awards. Simply list the awards that have been Issued to you. Special endorsements are 10^ 25, 50, 75, and lOOpius.
HAROAA DX Award
This is obtained by working DX sta- tions, tt is the number of stahons worked that is important. Each DX station counts as one, even If several are from the same country or area. Special endorsements for this awand are 10. 25, 50, 75, 100, 200, and 500 DX contacts-
KAROAA Insomnia Awerd
This award is earned by communicating with one other amateur-radio station tor a
minimum of one hour between the hours of 1:00 and 5:00 am. A super conversation
piece for your shack,.
HAflOAA Super Operator Award
This certificate Is rendered for those providing a service on behalf of amateur radio such as weather otiservation, pubftc service, emergency work, helping a new ham, providing communications for a community function, etc. The require- ments are for the applicant to briefly de- scribe the event or service. The officials of HAROAA will determine whether it de- serves this special recognition.
HAROAA OHicial Traffic Handler Award
This award Is a selMssued achFeve- ment, allowing you to display the fact that you are indeed an official handler of radto
traffic.
WORKED TRUMBULL COUNTY AWARDS
The Warren [Ohio} Amateur Radio Asso- ciation, Inc.f announces its Worked Trunv bull County fWTC), Worked Trumbull County Mobile (WTC-IVf), and Worked Trumbuli County YL (WTC-YL) awards. These programs are designed to promote increased amateur radio activity among and with Trumbull County amateur-radio operators. The awards afso reward operat- ing achievements.
Application: Send applications and all correspondence to; Don Lovett KasXT, Awards Chairman, WAR A, PO Box 809, Warren OH. One doitar must accompany applications from W^ K, and VE amateurs; all others should send three IPCs with ap- piication^ Oniy Trumbuii County appli- cants must submit actual QSL cards. All others should have certification letters from two other radio amateurs which veri- fy that they have seen and chec>^ed the ap- plicant s OSLs. Each application must also be accompanied by a list of the calls worked, with full log data for each contact.
Requirements
WTC— For each certificate or endorse- ment, Trumbull County applicants must have 20 contacts with other Trumbull County amateurs. Other W, K, and VE sta-
tfons must contact 10 Trumbull County amateurs, while DX applicants must have five contacts.
WTC-M — For each certificate or en- dorsement, Trumbull County applicants must have 20 contacts with other Trum- bull County amateurs operating mobile in Trumbull County. Other W, K, and VE sta- tions must contact 10 Tfumbull County amateurs operating mobile In Trumt^ull County, whife DX applicants must have five contacts.
WTC-YL — For each certi^fiicate or en- dorsement, W, K, and VE stations must contact 10 Trumbuii County YL or XYL am- ateurs, while DX applicants must have three contacts.
Award: A certificate will be issued on each approved application but in order to appear on the certificate, special endorse- ments must be filed with the initial filing, each containing at least 25 percent new contacts, initial endorsements are free of charge^ but endorsements made on later dates will take the form of WTC certifi- cates. Appii cat ions for these must con- tain proper fitting fees. Endorsements may be ail one mode, all one band, all mobite- to mobile, or all memi^ers of the Warren Amateur Radio Association. Inc.
Net contacts, contacts made through repeaters, and contacts made before Jan- uary 1. 1959f cannot be counted.
A FAR NET AWARD
The Armored Force Amateur Radio Net is a nonprofit and informal group of ama- teur-radio operators who are veterans or active-duty service personnel who have been assigned or attached to an armored unit of the United States Armed Forces or their allies at some time in their military careers.
The A FAR NET offers its A FAF NET Award certificate to amateur-radio oper- ators of any nation. The 8 Va" X 11" certifi- cate is printed in four coiors on white on heavy stock and is intended for framing. Endorsements are avaiiabie for malting additional contacts and for making con- tacts in one mode or on one band. Appli- cation may be made for any award level, mode, or band operation at any time.
To quaiify for the basic award, non- member stations must establish two-way
contact with a minimum of fifteen differ- ent A FAR NET member stations. To quail- fy for endorsements, non-member sta- tions must make contact with ten or thirty- five additional members on any band or Jn any mode. Confirmation of the required contacts must be through a copy of the non-member's log that has been certified by two other amateur-radio ope rate fs.
Appticants for the basic award certifi- cate must submit a minimum of fifty cents along with their application to cover post- age, envelopes, etc. Endorsements not mailed atong with the basic certificate will require only a normal 4W' x 6" SASE. Applications for the basic award or endorsements should be sent to: Alfred G. Beutier K2DWI, A FAR NET Certificate Manager, 36 Manchester Road, East Auro- ra, New York 14052, Please allow from two to four weeks for mailmg of the certifi- cates or endorsements.
HONG KONG AWARDS
HARTS meets every Tuesday at 1700 locals excluding public holidays, at the China Fleet Ciub^ Arsenal Street, Wan- chaii Hong Kong Istand.
Nine Dragons Award
This award is given for one contact with a country In each of the following 9 zones l ie, 19, and 24 to 30. Contact for zone 24 must be a VS6. Stations within the 9 zones require 2 contacts in each zone, with 2 VS6 contacts. Cnly contacts after Janu- ary 1, 1979; are valid. Fees are US $3, Aus- tralia $3, 1 pound 50 pence England postal order, or 24 IRCs.
Firecracker Award
This award Is given for six contacts with different VS6 stations. Stations In zones 18, 19, and 24 to 28 require 10 contacts with different VS6 stations. Only contacts after January 1, 1964, are valid. Fees are US $2. Australia $2, 1 pound England post- al order, or 10 IRCs.
Usual Conditions
Certified log extracts only — no OSL cards are required. Payment to be made in cash— no bank drafts. Postal orders to be left blank. Claims to: Awards Manager, HARTS. GPO Box 541, Hong Kong.
I
Reprinted from the Federal Reqhief
FEDERAL GOMMUNICATI0I4S COMMISSIOM
47 CFR Parts 1 and 97
[PR Docket Ho. 93^2?: EIM-42M; FC€ 84-
324J
Use of Volunteera To Prepare arid Adrnlnlster Operator Examlrtstions In the Amateur Radio Service
AOENCV; Federa] Communicationa Commission.
action: Final rule.
SUMMARY^ This document amends the FCC rules regarding the preparation and administration of amateur radio operator examinations above the Novice Class to permit Volunteer-Examiner Coordinators (VEC'aJ and volunteer examiners to design the examinations instead of the FCC. This amendment VQill relieve the FCC of the
administrative burden ofdestgnirrg the eitaminationa and permit VEC'a and examiners more latitude in preparing and administering examinattona. Thia dcn;umenl also amends certain other FCC rules regarding the Amateur Radio Service volunteer examiner progjam to clarify them.
EFFECTIVE oaTe: August 31. 19S4.
POn FUftTHfrt lltFOftMATION CONTACT: John J. Borkowski^ Private Radio Bureau, Washington, D.C 20554. [202) 632^964.
Appendix
Parts 1 and d7 of the Commission's Rules (47 CFR Part* 1 and 97] are amended as follows;
PART 1— [AUENOEDl
1. Paragraph (e) qf 1 1.925 is revrsed to read:
§ 1.925 AppMcatkm for ■fi«cM l«fTkpor«ry
authorlzatlorv lemporary (MHinlt or teJ^porary operating authoiity-
« t * * #
[e) Unless the FCC otherwise prescribes, an ai^plicant already Licensed in the Amateur Radio Service, upon BucceasfuJly completing the amateur radio operator examination [a) required for a higher clasii, may operate his/her amateur radio alation consistent wiih th« rights end privileges of that higher class for a period of one year from the date of the most recently completed examinalion(s] for that operator classr in accord with the provisiona of § 97.35.
PART &7— [AMENOEOl
2. The Table of Contents for Part 97 is amended as fotlowsr
a. The heading of | S7 J17 is revised to read "Examinatiana."
b. The heading of 5 97.523 is removed.
3. Paragraphs [&]y (bj> and [d] of § 97,27 «re revised to read:
$ 97.27 Examination prepvatlon.
[a} Element 1(A) shall be prepared by the examiner. The preparer miL&t hold an Amateur Extra . Advanced or General Class operator Hcense. The test shiill be such aa to prov^ the applicants ability
to transmit correctly by hand (key, straight key. or, U fiupplied by the applicant* any other type of hand operated key such as a semi-automatic or electronic key, but not a keyboard keyerj and to receive correctly by ear texts in the intemational Morse code at a rate of not less than fiv« {5] words per minute during a five-minute lest period. Special procedures may be employed in cases of physical disabihty. (See I 97.Z6(g).] The applicant is reaponsible for knowing and may b« tested upon the twenty-six letters of the alphabet, the numerals Q-9, theperiodj^he comme. the question mark Ak» SK^ BT, and DN. (See I 97.29[c].]
(b] Elements 1[B} and l(c} shall be prepared by the examiners or be obtained by the exatniners from the VEC. The preparer must hold an Amateur Extra Class license. The teat shall be such as to prove: the applicant's ability to transmit correcUy by hand (key, straight key^ or, if supplied by the applicant, any other type of hand operated key such aa a Bemi-automatlc or electronic key. but not a keyboard keyer} and to receive correctly by ear texts in the international Morse code at not leSB than ibe prescribed speed during a five-minute tesi period. Special procedures may be employed in cases of physical disability. [See S 97.2tJ(E).) The applicant is respongtble for knuwing and
73 Magazine • October, 1984 77
may be lesled upqn the twenty-six letters of the alphabet, the rmmerals 0-9. the period, the commas the queation mark, AR, SK, BT ai)d DN, {See I 97.23(c).)
(d) Elements :). 4(A) end 4(B) will be designed by the VEC. The VEC will select questions for €ach test from the eppropriate list of questions approved by the Commtssion (eilher PR BuJIeltn 1035 B, C or D. latest date of iasuej. The VEC must select the appropriate number of questions from each category of the syllabua (PR Bulletin 1^5] us specified in PR Bulletin 1035 a C or D, These quejitiniis must be taken verbatim from the appropriate PR Bulletin tn the farm in which they have been approved by the Commis^aion. Beginning Janusry 1, 1987, volunteer examiners may also design Elements 3, 4[A) and 4(B) in accord with the provisiong of this paragraph. Each VEC and each volunteer examiner is required to hold current examination designs in confidence-
± * It t i
4. Paragraphs [a) and [e] of £ 97.26 are revised to read:
1 97^ ExamlnBthm oftmlnlstnitforL
(a] Unless otherwise prescribed by the Commisaloni each examination for an amateiif radio operator license (except the Novice Class operator license) shall be administered by three accredited (see 5 97.515] volunteer examiners. An examiner administering telegraphy examination element 1(A} or written examination element Z (in conjunction with an exiiminalion other than b Novice Class examination} nr written examination element % must hold an Amateur Extra Classi or Advanced Class radio oper^jitor license. An examiner administering telegraphy examination element 1(6) or 1(C) or written examination element 4(A) or 4(B1 must
hold an Amateur Extra Class radLo
operator UcenBe.
• t * * ♦
(e) When the candidate scores a pdi^sing grade on an examination element, the examiners (except for examinations for the Novice Clasa operator license) must issue a certificate of successful completion of the examination. This certificate may be used for a period of one year for examination credit for telegraphy elements l(A]. 1(B) or 1(CJ. (See § 97.25(b),)
5p Paragraph (b) of I 97.31 is revised to read:
I 97.31 Volunteof examiner r*q<jlr«m<Nitft.
(b) Any person who owns a significant interest in, or is an employe of, any company or other entity which is engaged in the manufacture or distnbutjon of equipment used in connection with amateur radio transmissions, or in the preparation or distribution of any publication used in preparation for obtaining amateur station operator licenses, is inE^igible to be a volunteer e5<an*iner for purposes oi administering an amateur radio operator eXHminatian. However, a pf?rson who dv^9 not normally communicate with thai pHrt of an entity engaged in the eit^ouf^cture or distribution of such equipment, or in the preparation or distribution of any publication used m preparation for obtaining amateur operator licenses, is eligible to be a volunteer examiner.
d <■ ■ < M
e. Section 97.35 i* revised I o read: ^ 97.35 Temporwy oparaUni) suttwdly.
Unless the FCC otherwise prescribes mn applicant already licensed in the Amateur Radio Service, upon
successfully completing the amateur rttdio examinfltion{s) required for a higher claas, may operate an am^iteur radio station coosisierit with the rights and provi leges of that higher ctass for a period of one year from the dete of the most recently completed examination for that operator class provided that the applicant reta]n& the certiFicateis) for successful completion of the examination(9) {see § g7.ZB(e]] a I the station location, provided that the applicant uses the identifier code of the new class of license for which the applicant has qualified (KT for Tenhmcian Class, AC for General Clasa. A A for Advanced Class and AE for Amateur Extra Class) as a suffix to the present call sign {see § 9? .84), and provided that the FCC has not yet acted upon the application for a higher class of license.
7, Paragraph [f) of S 97.84 is revised to read:
$ 97^4 Station Idsnltffcatlon,
[f] When operating under the lemporary operftUng authority permitted by g 97.35 with privileges which exceed the privileges for the daset of operator license currently held by the licensee, a licensee must Identify in the Following mannen
(1) On radioteiephony, by the transmission of the station call sigfi, followed by the word **temporary", followed by the identifier code for the new class of license for whEch the licensee has qualified [see § 97.35).
(2) On radiotelegraphy, by the transmission of the station callsign, followed b5f Ehe Fraction bar DN. followed by the idem tf fie r cocfe for the new class of license for which the licensee has qualiTted (see § 97.35).
R, Paragraph |a] of I 97.503 is revised to read:
§97.503 Definitions.
(a I VotUiiteer-exaniiner coordinator (VECJ, An oiTiaoiiation which has entered into an agreement with the Federal Communications Commission to coordinate the efforts of volunteer ejcamineis in preparing and admmistering examinations for amateur radio operator license.
& Se-cLion 97.505 is revised to reed:
f 97.505 ApptlcabUtty Qt ruteL
These rules apply to each organization that serves as a volunteer examiner coordinator.
10. Section 97.5I}9 is revised to read;
§ V7.50a Confltcl* Hi U)tvr*«t
An organization engaged in the mannfadure or distribution of equipment used in connection with amateur radio transmissions, or in the preparation or distribution, of any publicatiDo used in preparation for obtaining amateur radio station operator licenses may be a VEC only upon a persuasive showing to the Commission that preveiiiative measures have been taken to preclude any possible con flic t of i merest.
n. Section 97.511 is revised to read;
§ f T J1 \ Aorewnefit rvqutrtd.
No orgarTizatJon may serve as a VEC until that orgaoi^tion has entered into b written agreement with the Fedt^ral Communications Commission to do so. The VEC must abide by the terms of the agreement.
12, Section 97.517 is revised to read
"Xr^rr v:: :W:M;:::S^li*!^
%bit
%rbltt>
|
i t-^f -^^ |
|
liff |
ORBIT Is the Official Journal for the Radio Amateur satellite corporation.
For a SAMPLE COPY please
send $2 to:
(AMSAT), P.O. Box 27, Washington, DC
20047.
I
I I
I
MOVING?
Let US know 8 weeks in advance so that you won't miss a single issue of 73.
Attach old label where indicated and print new ad- dress in space provided. Also include your mailing label whenever you write concerning your sub- scription. It helps us serve you promptly. Write to: ^m^^ Subscription Department
/^ Amateur Radio's P,0. Box 931
m *^ ® lechnicalJournaf Farmingdale NY 1 1737
D Extend my subscription one additional year for only $17.97 D Payment enclosed D Btll me
Canada & Mexico ^IC^^lfS year onEy US Funds drawn on US bar}k. Foreign Surface 525.00/1 year only US Funds dr^wn or> LfS bank FoFt^tgn AErmaJl, plea.se inquire.
I I
I If you have no label hundy, pnm OLD uddres:^ here.
I I
Name
Address City
State.
Zip.
pn'ni A/f K^f/Afe'^3 Iicw:
Name _ Address. City
State.
Zip.
I
^ZZJ
78 73 Magazine • October, 1984
A VEC will design {see § 97 2?[d)j, afi&c;iiLb}«, print and distribute written examinBtion EtenientB 3, 4(A]^ and 4fBJ. A VECmay design, assemble, print and distrihnte examinalioTi Elements 1[BJ and IfC). A VEC ia required to hold examination designs in confidence.
|97.5» rHarnouadT
13. Section 97.523 ia removed and reserved.
47CFRPBrt97
IPn Doc«(«t No. «^-«^; nU Nos. 370S, 3724« 3734, 377B, 3831, 3633, 3060; FCC 84-345 1
Radlotetepliony ExpansFon HlgTi Frequency Amateur Bands; RM-A22B Petition for Telephorvy Operatlant on Frequencteft Between 7075-7100 kHz In HftwaM and In Areas Near fteglon 3
AOiHCv: Federal Communications
Commission.
ACTION: Final rule'
SUMMAAVr This docuinent amends the mlea by expanding t&Iephony privileges on frequencies 375CMOO0 kHz. 21200- 21450 kHi^ Za300-29700 kHz. and 7075- 7100 kHz [Hawaii and in areas near Region 3), Ht^se ajuendmenta are necessary ao that amateur rudio operators will have additioEial. radiotelephone frequenciea on which to operate. The result of this action 'm to relieve the overcrowding on Ihe preaently-ailocated frequencies for radiotelephony in the Amateur Radio Service.
EPFlcnvc date: OODI. Universal Coordinated Time (UTCJi September 1,
ADDRCSS: Federal CommunicationB Commiaaion. Washington. D,C. 20554. FOR INFOftMATtON CONTACT;
Maurice [, DePont« Private Radio Bureau, Washington, D.C 205^, [202] 632-4964.
Appendix
Part 97 of Chapter I of Titl^ 47 of the Code of Federal Regulations is emended, as follows:
1. Section a7.7ta) is revised a& follows!
§ 97x7 Privilege* of operator Hcenses.
(a) Amateur Extra and Advanced Class. All authorized amateur privileges Including excluaive frequency operating authority in accordance with the foilowing table:
|
FrutfucAdiH |
Cim. oi iit«nH auinonrad |
|
3750-3776 fcMi ....... ..ti^^-U-... |
Do, |
|
7000-7026 kHt...... 14.000- U.Gi2S kMt ^ 14i1 50-14. t7S kHz.,......^.^.... !iOOO-?l .025 iiHi..........-.,.,.,... iijxiChii.sis id-ii...._„ |
Do, Dq. Da. DO Dq. |
|
a775-MSO kHz .... 7 T$0- T^iB khir „ 14 17^14.225 hHi _ _. 5^.225-21,300 IHa |
Do Do Do |
2, In I 97.61fa)^ that portion of the table under the heading ''kHi" is revised to read as follows. The entries in the table under die headings "MHz" and "GHz" remain the aame*
5 »7.ft1 Authorised !tequ«ficle» ind emisfllona.
(a}* ' •
Fr«C)uftDCy tiimj
i$ao to 3000
3SO0 to 4000.. -.
350ciroa?50 _.
3750 10 4MlO ...
700C 10 7300,. .
7000 b 7lW,.,™^„. 7075 10 7100 . — \,...„ 7150 10 7300 _„.
14000 ta 143»....„. 1*000 to 14150..^.„
H1&0 1O 143S0
2100CI to?t*&0,
21000 to ?t2O0.._„..
Z1£00 to 21450
28000 (0 29700..„_.
2tt)oo ID aasoo—^..,
2fr30O ID 2d700........
Efntiaio^s
.^^ P I ^^iJ U IBblBllddll ■ L^BI^U IBIHl <■■■ r I ._._. .._iJ._. .LILIb.l ILJBII.IEIBILIBII
A3, M. AS. f 3, f 4. F5,.
At - -...
F1._
AaF3
Aa A4. A5. Fa F4. F5.. A^ .
^~^~---" F1 .-.,.,...-, .^ ._...;___
A3, M. M. F3, F4. F5..
^^ I ■ KAM ■ I ■'■ ■ I ■ ■ ■ ■ ■ rq i':i ■ ■ r^i m r^ r'r- — ii— • r | r T I ii.iiJiJiiBii.iFiiiiiiKii^piriiiir^''-'^
A3, A4, AS, n, F4, PS..
pafo-
4
13 3.4
11
a4
3. Secton 97.61(b) (11) is revised to read as foilows:
$ 97,St Authorized fT«<)u«ricl» and •mitsJorfS.
m*
* •
fll) The use of A3 and F3 in this band is limited to amateur radio stations located outside Region 2 and amateur radio stations located within Region 2 which ^re west of 130 degrees West
longitude.
• ' -* • » A
47 CFR Part 97
[PR Dock«i No. a4-2«e; FCC 04-^221
Reimbursement of Out-of-Pocket Costs for Vofunteer Administered Amateuf Radio Examine tkHis
agency: Federal Communications
Commission.
action: Final rule.
summary; Thia document amends the rules to provide for reimbursiement of out-of-pocket costs incurred by volunteer examiners and volunteer examiner coordinators in connection with adminiBtering or coordinating amateur operator license examinations. The rules are necessary so that the volunteers can recover their prudently-
incurred expenditures. The effect of this action is to establish reguJationa which permit reimbursement to volunteers far their necessary expenses. EFFECTIVE date: August 31. ldS4.
address: Federal Communications Commission, Washington, DC 20554. FOR FURTHCR INFOAMATiDN CONTACT: Maurice J< DePont, Private Radio Bureau. Washington. D.C. 20SS4. (2D2J B3S-4964,
Appendix
Part 97 of Chapter I of Title 47 of the Code of Federal Regulations is amended as follows:
.^•^
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73 Magazine ♦ October J 984 79
1. Section 37.3l(c:) 19 revised to read b.3 foJlowa:
I §7.31 Vohim««r «)tamlner requirements. *****
[c) Volunteer examiners may not be compenaated for serviceB. They may be reimbuTBed for out-of-pockel expenses, except for Novice class examinationa fsee ! 97.36).
2. Section 37.33 is revised to read aa follows:
S '^7.33 Volunteer examiner conduct
No volunteer examiner Ghall give or certify any exammation by frauduleni meatia or for monetary or other consideratjon. Violation of this provision may result in the revocation of the amateur radio station license and the suspe^nsion of the amateur radio operator license of the volunteer examiner. This does not preclude a volunteer examiner front accepting reimbursement for out-of-pocket expenses under § 97,3^. Reimbur&eirfenl in any amount in excess of that permitted may result in the sanctions EpcGJfied hereiti^
3. New I 97.36 is added as follows:
§97.36 Reimbursement for eipetises»
(a] Each volunteer examiner coordinator and each volunteer examiner may be reimbursed by examinees for out-of-pocket expenses incurred in preparinj^, processing or administering examinations For amateur station operator licenses above the Novice class. The volunteer examiner coordinator or the volunteer examiners must collect the reimbttrsement feCt l\ any, from the examinees. No reimbursement may be accepted for preparing, processing or administering Novice daa» examinations,
[b) The maximum amount of * reimbursement is S4,()0 for 1984 and will be adjusted annually each January 1 thereafter for changes in the Department of Labor Consumer Price Index. Changes In the maximum amount of reimbursement will be announced by the Commission in a Public Notice. The amount of such reimbursement fee from any examinee for any one examination
at a particular session regard I e8.3 of the number or examination elements I a ken must not exceed the published maximum.^
{o\ Each volunteer examiner coordinator end each volunteer examiner who accepts reimbursement must maintaia records of out-of-pocket expenses- and reimburseinents for each examination session. They must certify on or before January 31 of each year to the Commission's office in Gettysburg, PA 17325 that all expenses for the period from January 1 to December 31 of the preceding year for which reimbursement was obtained were necessarily and prudently incurred,
[d) The expense and reimbursement records must be retained by each volunteer examiner coordinator and each volunteer ex £t miner for 3 years and made available to the FCC upon request.
[e\ Each volunteer examiner must forward on or before January 15 of each year the certification concerning expenses to the volunteer examiner coordinator who coordinated the efforts of the volunteer examiner and for which reimbursement was received. The volunteer examiner coordinator must forward all such certifications and ila own certification concerning expenses to the FCC on or before fanuary 31 of each year.
(F) The volunteer examiner coodinator must disaccredit any volunteer examiner who fails to provide the annual certification. The volunteer examiner coordinator must advise the FCC on January 31 of each year of the volunteer examiners that it has disaccredited for this reason.
4. Section 97.507(e J is revised to read &9 follows:
§97.507 VEC qualfltcetioftf. « * • + *
(ej Agree not to accept any compensation from any source for its services as a VEC, except reimbursement for out-of-pocket expenses permitted by g 97.36: and
A ^ * -k *
5. The introductory text preceding paragraph (a) in § 97.515 is revised to read ^s follows:
HAW HELP
I need a manual and plug-in rriiemory modules for a Memory-Malic 8000 l<;eyer by Data EngineefloQi Inc.
K. 0, Benton K4FHQ
333 Croashill Lane
Warrior AL 35 ISO
Vd like information on interfacing a Mo- torola speak er/m Ike to a Yaesu Fr-2DBR. 1 have it tiooked up but th^ speaker/mike overheats.
ArtOates K9GBN
12^ Arrow I>rive
PeklnIL 61554
Help] Whsfe can 1 get a 15m SSB con- version kit for my Sears 663-3610,0050 CB tfansceiver before \ go back to Europe?
Klaus Slichtern^th N2EH0
£8 Mandalay Drive
Poughtkeep^ie NY 126D3
I am interested In starting a club for overseas American hams. This would in* elude publishing a newsletter for the members to exchange ideas, equipment, and Information, running a weekJy net, tietplng individuals get licensed in some
80 73 Magazine * October, 1984
countries, and assisting indivlduais in getting equipment air-st>ipped to remote locations, ft you are Interested in forn^ing such a ciui>, please contact me at the following addre&s.
Charres E. Martin AB4Y
Am Embassy MAPUTO
Dept. of State
Washington DC 20520
I need to know where I can buy parts
and have a high-voitage transformer re- paired for a General Electric television, model 810. t also need & schematEc for a Grundig Universal Music- Boy, model K'74.
William Deramo
51 Sullolk Ave.
Revere MA 02151
I am 1fyin0 to locate Advanced Commu- nications Intemationalp a manufacturer ol watches, whose last current address was 2^11 Lincoln Avenue, Belmont CA 94002 If this company Is stilt in business, I would like Itie^r new address.
Ernesto Hormlllo&a
Det, 5AFSCFni6)
APO San Francisco 96334
§ 97. 5 1 5 CiMHtUniitlng voliim««r examirNBTS.
A VEC vtfill accredit amateur radio operators licensed by the Federal Communications Commission as volunteer examinem [see § fl7,30}. A VEC will seek to recruit a broad representation of emateur radio operators to be volunteer examiners. A VEC may not discriminate in accrediting volunteer examiners on the basis of
race, sex, religion or national origin. A VEC may not refuse to accredit volunteer examiners on the basis of membership (or lack thereof) In an amateur radio organization. A VEC may not discriminate in accrediting volunteer examiners based upon their accepting o? declining to accept reimbursement. A VEC must not accredit an amateur radio operator voLuateerlni; to be an examiner if:
WE LUTES
USING THE AO-10 APOGEE PREDICTIONS
Apogee predictions for t?ie month of Octol^er are provided for three sections of tlie United States: Washington DC at 39 N 77 W, Kansas at 39N 95W, and California at 3aN 122W. Times are in UTC and apogee in this case is mean anomaly 12S rounded to the nearest whole hour Use the chart as a guide In aiming your antenna, then fine-tune the azimuth and elevation values to peak the satellite s beacon signal, if you require more accurate orbital predictions, contact AWSAT at PO Sox 27, Washington DC 20044.
AM5AT ANNUAL MEETING
The yearly AMSAT technical symposium and general-membership meeting is slated for Saturday, November 10 at the Amfac (formerly Airport WlarlnaJ Hotel on the north side of Los Angeles intern at bnat Airport, A block of convention-rate rooms has been set aside— for reservations, contact Itie hotel at (2131-670-8111.
Technical presentations on present and future amateur-satellite projects will be given during the morning and afternoon sessions. The ger^erahmembership meeting will be held in the evening following a banquet dinner. For detailed conference inforrnation and registration, send an SA3E to Dennis Olnga N6DD, PO Box 411 1^ Diamond Bar CA 91765.
Thanks to Amateur Satellite Report for this month's n&ws.
AMSAT^OSCAR 10 APOGEE PREDICTIONS
OCTOBER 1984
|
WASH |
KANSAS |
CALIF |
||||||
|
ORBIT |
DAY |
TIME |
AZ |
EL |
AZ |
EL |
AZ |
EL |
|
1309 |
- |
0800 |
184 |
10 |
269 |
32 |
||
|
1310 |
1 |
2200 |
96 |
17 |
84 |
3 |
||
|
1311 |
2 |
0700 |
280 |
11 |
264 |
33 |
||
|
1312 |
i |
2000 |
81 |
8 |
||||
|
1313 |
3 |
0700 |
285 |
3 |
274 |
17 |
257 |
40 |
|
1315 |
4 |
0600 |
279 |
12 |
268 |
27 |
247 |
50 |
|
131.7 |
5 |
0600 |
274 |
16 |
262 |
30 |
238 |
53 |
|
1319 |
6 |
0500 |
263 |
25 |
254 |
40 |
22 2 |
61 |
|
1321 |
7 |
0400 |
261 |
35 |
245 |
50 |
196 |
67 |
|
1323 |
8 |
0400 |
254 |
38 |
235 |
53 |
180 |
66^ |
|
1325 |
9 |
0300 |
244 |
48 |
218 |
61 |
151 |
64 |
|
132 7 |
10 |
0200 |
231 |
57 |
193 |
66 |
128 |
58 |
|
1329 |
11 |
0100 |
211 |
65 |
162 |
67 |
113 |
50 |
|
1331 |
12 |
0100 |
195 |
64 |
150 |
62 |
110 |
44 |
|
1333 |
13 |
0000 |
166 |
66 |
.129 |
57 |
100 |
35 |
|
133^ |
13 |
2300 |
140 |
62 |
114 |
49 |
91 |
26 |
|
133 7 |
14 |
2300 |
132 |
56 |
111 |
43 |
90 |
20 |
|
13 39 |
15 |
22 00 |
116 |
49 |
100 |
34 |
82 |
12 |
|
1341 |
16 |
2100 |
105 |
40 |
92 |
25 |
75 |
3 |
|
1343 |
17 |
2100 |
103 |
34 |
90 |
19 |
||
|
1344 |
18 |
08 00 |
278 |
13 |
||||
|
1345 |
18 |
2000 |
101 |
28 |
82 |
11 |
||
|
1346 |
19 |
08 00 |
272 |
16 |
||||
|
13 4 7 |
19 |
1900 |
86 |
17 |
75 |
3 |
||
|
1348 |
20 |
0700 |
282 |
4 |
266 |
26 |
||
|
1349 |
20 |
1900 |
84 |
11 |
||||
|
13 50 |
21 |
0600 |
287 |
0 |
276 |
14 |
259 |
36 |
|
1351 |
21 |
1800 |
77 |
3 |
||||
|
1352 |
2 2 |
0600 |
282 |
3 |
271 |
17 |
252 |
39 |
|
1334 |
23 |
0.5 00 |
276 |
12 |
265 |
27 |
243 |
49 |
|
13 5 6 |
24 |
0400 |
270 |
22 |
257 |
37 |
229 |
38 |
|
1358 |
25 |
04 00 |
264 |
25 |
250 |
40 |
216 |
60 |
|
1360 |
26 |
0300 |
257 |
33 |
240 |
49 |
191 |
65 |
|
1362 |
27 |
0200 |
248 |
44 |
225 |
58 |
162 |
6? |
|
1364 |
28 |
0200 |
240 |
47 |
S13 |
59 |
1 51 |
61 |
|
13 66 |
29 |
0100 |
226 |
56 |
189 |
63 |
IW |
55 |
|
1368 |
30 |
0000 |
205 |
62 |
161 |
63 |
115 |
47 |
|
1370 |
30 |
2300 |
178 |
66 |
136 |
39 |
103 |
3% |
|
137 2 |
31 |
2300 |
165 |
62 |
130 |
53 |
101 |
33 |
RTTY LOOP
M^rc /. Leavey, M.D. WA3AJR 6 Jenny Lane Pikesvme MO 21206
Lers plunge into some quest ions this month, which I Itirnk arB broad efKXj^ to app^y to a g&ad rtiAtiy of us involved in RTTY.
Ric* Thomas of Ohemos. Michigan. a5k3 about the lise of optoi sola tors to pick oH a signal (rom a RTTY loop thmm-fitce phrase} fq^ Inputting to a co/nputer. Well, Rick, the use of isolating devl<;es between a teieprirtiar loop, typically running 150 to 300 voUs at 60 mA, and the sensitive input qf a cornputer is a very good idea, As you suggest In your leifer, optolsotators are one such cfevic© which can be used. Fig. 1 is a simple schema to ptck the signal off a loop and oulpui Ihe data through an opto- isofaTor. One feature of this scheme is the use of a bridge rectifier ro extract Ihe sig- nal from ttve loop. Ihus making the cifcuit immune to ihe polarity of the loop-
Another *ay to derf>ve the RTTY sigrval tnit remain isolale<f elecirically from the loop is wjth Ihe use o1 a n^agneiic feed re- lay. Fig. 2 is a way lo mtertace a reed letay Into a loop, in this case. It*e cutrenl limit- ing on the loop stKHilcf keep the relay coil fiwn burning out despite beirtg supplied fiwre voltage iftan is normalty useil t ■would use thts type ol a circuit if i had to key ano(t>er loop that didn t use TTL volt- age levels
Rick also eipf esses co-ncem ovm light- ningnnduced votiage transients ^tting into his loop or equipment. Well, you might lake a look at a new little wonder, the nvetal-oxide varistor. These MOVs took like a diac capacitor but are truly lit- tle f^ORvets, pamfon Ih^ pun. Radio Shack
carf ies iwo ^wsions: The vaZA1 t276-56^ protects digital ar>d linear circuits op* eraling at five volts arKf t>efow, and the V130LA10A i27&570> is for Irne^rperaied eguipmeni Fig. 3 is a simple diagraTn of tiow to hook one ol these up to a piece of line^operated equipmerit. It siKXjId be ret- a lively easy to adapt this lo wtiatever you like.
Here's * note from Harvey Wenzet KAacUB in Brunswick. Ohio. iHarvey has lust gotten hold ot a Model 33 ASR Tele^ type*" machine and would like to hooN rt up. Way to go, Harvey! Unfortunateiy, a lot depends on jusi what "guts" your ma- chine has, aa different call-controC units, that's the circuitry in the panel on the right, require different hookups. Howi/ever, here's something to gel you started- Look inside of your mac h line for a nln&^onduc- tor screw-type terminal strip. It should be near the back and. if you're lucky, labeled 15141 1 Now, look at Fig, 4 and try to use (f>e4e hookups to run your printer and key- t>oard Good luck. ar>d if you can deter- mine the exact call-contro4 unit or send me what^v^t Infoi maHion you can derive, i will see if I can f^elp oul.
Fw years we called them either termi- nal units CH demodulators, Now, tliey &fe marketed as receiving i ntef faces. Still ttie same thing, folks Titat's wtty this rwte. from Kfis Cena in Hamillon, Ontario, nngs. a bell. Kns would like to know what the bost interface is to go between a receiver arK3 his mfcrocornputer. Kris, you don't want to know what the best interface is because, as the saying goes, if you have to ask, you can! afford M- The liottom line is that about any terminal unit will do ^st fine, not necessarily one that is directed at the computer crowd. If you are lucky, a
TO LOOP
iopn
DLODES lA. 400VDC
+5V
4Na*j
Fig. T. U^ing an optof&oistor ifi tfie ioop.
|
iDon |
<^ |
V COIL FED Rf L*t |
||
|
TO J |
r |
1 > |
||
|
LOtm |
1 r- f |
|||
|
\ |
||||
|
' f |
— i |
f |
OUTPUT
pass or two at hamfest tables may turn up just what you need. The essentials should be a stable. pfeteraJsiy fairly-modern unit that is capable of putting out a TTi4evel signal, 01 course, you could always use ooe of Ihe isolation circuits from above to adapl a "loop ofily ' bargain. Any of ihem srtouid work fust firwL
Kaypro owners, listen up! We said a few months back that } had s^ nothing for that rnachine Well, I $titJ haven't but Tyier Parsons WB7DDL says that t>e has some- thinrQ fo* you. Tylcf is running a RTTY ter- mir\al program, written in Pascal, on his Kaypro II. He is offeiing Ihe program at S?9.9S. includir^ ttie program and instruc- tions on disk. He also indicates that he would consider adapting the program for the Kaypro 4 if there is sufficient interest. Write him tor more Information at I9t5 S-E. Stone Street, Corvaltis, Oregon 97333, and tell him you are interested In thfi Kaypro RTTV program mentioned In ^'RTTY Loop,"
Another new member of the club is Ha r^ J, Pr^ekOp, Jr. WB9EDP near Chicago, Uli- no is. Harry is Interested In talking to other users of the Drake Ttieta 7000E communi cations terminal. Sorry to say, Harry ^ I have no personal information on this ter- minal. As I mentioned last month, what in- formation I get, I print. If the manutactuir- efs aie interested, t am available. Anyway, if you want to share your ejtperiences with Harry, drop him a line at 332 S. Cuyler . Oak Park. Illinois 60302. Send rne a copy, too, and I will share the information with the mghitudes!
To ttH>se who have virritten asking wtiere tne printouts of tt>e winr^ers of this year's SCATS RTTY an contest are— they dn^t ser>d tfiem to me this year. Sorry. Maybe r>exi time?
A ietter from Bay Smaiiey NB2W fn Soitth River NJ has me a bit contused. Ray relates that he is "trying to Lise Clay Al^fams' NEWRTTY program on the CoCo* Put would like to use the RS?32 porl instead of the ROM port." Ray. let's define a few terms, then look at the pro- gram On Ihe back of the CoCo is a four- pin DIN connector, commonly called the RS-232 port. This serial port Is not a true, hardware, serial port, but rather a "bit banger" which uses one bit of a parallel port fof Input, one bit for output, and a software serial- in put routine, In som# re- spects, this resembles the RTTY program fOf ttie 6&00 published here about six or seven years ago. Now. on the side of the CdCd tsehind a spring-loaded door is an
TO REST or EOUlPUEIfr
ftdge conrvector, commonly called the ROM port. This Is. in fact, an extension of Ihe CoCo's address and data bus. Several manufacturers take advantage of this fact by building short extension buses, kind of mini mother t>oards. which allow several ROMpack^ype devio^ to be plugged in at Otice.
Now, with that said. lel'S look at NEWHTTY. Til is program sends RTTY da- la Out and receives ctemodu Fated RTTY da- ta in through tt>e bi^^sanger RS 232 pofl. The software driving the pon tias twen changed so that instead of expecting ASCII, it expects Murray and does lf>e nee- essafy coAversion before presenting the dsla to yoti. So. as you can see. \t\e sl^rv dard RS-232 port is ali you r^eed use with this program; you need never touch the ROM pert. Perhaps someday Clay will come up with a disk version of the pro^ gram, and that ROM port will be needed Id run the disk. Hope this clears things up a bit.
Okay east coasters, here we go Inundat- ing another amateur. Lowell F. LInd K4AWQ is willing to give away a Model 28 ASR. If It has not been grabbed up by the time this sees print, you might want to drop him a note at 1308 N. Tuckahoe Street, Falls Churcli, Virginia 220J6. Remember that this column is written in July and pub- listied in tale September it it's gone whert you try. No guarantees. \ Just pass alorvg what I get.
TttarU^s tor ;t>e interesting comments and kudos ff om some more of our readeis: Glenn Perry W7FyD, in Mountain Home^ Idaho; John A. Kiefef KA0SHT, in Siinny^ vale^ Caltfofnta: John Sater W3LJW. Union dndgie. Maryland: Alfred Forte III WD4P0N, Oca I a. Florida; and Tom Glaza KCdAE, m FilKMii. Mict>igan. t appreciate all of your comments and suggest rons ar>d shaft iry to irvciude some of rnern in future columns.
Quite a potpourri this month. Don't you iove the suspense to see what comes next n:>Onlh? Be sure your subscnption is cur- rent so you won't miss anything in '*flTTY Loop,"
mkii
TERMfNAL STRIP ISl4il
PR^TEfi
KtBD
lirvAC
Fig, Z Using a reed tetaf tn tfm loop.
fig. 3^ Coanecting an MO¥ across the Hne.
fig. 4.. Terminai strip in a Mtx^ 33,
REVIEW
TENTEC MODEL 4229
ANTENNA TUNER
Awhile back. I saw advertised In 73 ihe Ten-Tec Model 4229 Antenna Tuner kil (Photo A), After some plain and fancy dancrng. J managed to snare the check* book away from Ihe XYL to order il. As I am a rather new ham, shie didn't realize the tradhion-setting this order entaiJed.
iDespite the slowness ot the military
mall system, in aboui three weeks a large bOK arrived from Sevierville, Tennessee. Only three weeks to gel an order from the United Slates lo Guantanamo Bay, Cuba, can be likened to same-day service.
Fortunately, I did not have duty the weekend the kit arrived. So, clearing a space at the dining room table, i carefully opened Ihe bOK and began. Oops! Look at all ttiose parts! This is a l^ol different from ttie tew Heaihkits* i've assemljled in ttie
past instant doubt. Did my ambition over- load my ability^ Did i bite off more than i could chew? (Gasp) Do I need to roust out my Elmer and admit I need help? Tune In tomorrow tor the next episode in the excit- ing adventures ot a new ham.
On closer reading of the instruction manual and a calming cup of coffee, I de- cided lo go on until l got stuck and only then ydp for help. The assembly ins I rue* tlons included with the kit said average assembly time was about eight hours. Not being as experienced, knowledgeable, and skiiiful as the average kit builder, and since I have always relied heavity on the blow-up drawings and pictures in the Heat hk It manuals, it took me about 18 hours to complete the kit. Gf anted, some of this tS hours invohred finding the silly
mistakes Td made and the time it took lo regroup. It was my^ several errors and r>ot the fault of Ten-Tesc or the manual.
The roller inductor is pre-wound and formed when the kit arrives. The variable capacitor is the kit builder's assembly project (Photo B), All those staler and ro- tator plates and spacers! Do NOT lose a spacer] The remainder of the kit's assem- bly is straightforward. The assembly in* structions are more or less divided into Sections. Read each section thoroughly before starting. Work slowly and carefully.
Yes, a Novice and a novice kit builder cart, with a little thought and a lot of care, assemble this tuner without too much trouble and without the assistance of an Elmer, it may take longer than the eight* fiouf average of the more experieftced
73 Magazine * October, 1984 Si
buHdef, but the results are vweM worth the time.
Ti»chnlca( Data
The Ten-Tec Mode! 4229 is an adjust- able reactive network used for matching the unbalanced SO-Ohm output ot a trans- mitter to a variety of loads, either balanced or unbalanced. It covers a frequency of T.8 to 30 MH2, with a duaUrange power and 3wr rneter Inciuded. Provision is made for selecting between four antennas (Photo C), on© of wtiich may be either to ng wire, balanced line, or for bypassing the match- ing network.
The circuit is a modified L network with an 18-uH silverplated roller inductor ca- pable of handling 2 kW of rf power. The ca- pacitor voltage rating !s 3,5 kV, and the matching-output range is at least 10;1 swf, any phase angle, i.a to 30 MHz.
The assembly instructions are weli thought out. All of the problems I encoun- tered were because 1 was careless In read- ing Instructions, I tried to hurry, or I did not pay close attention to what 1 was doirig. Granted the Ten-Tec manual does not have all the pictures and drawings of a Heathkit, but even a kit builder with mini- mal expertise can assemble a good-iook- Ing, functional antenna tuner.
Great, you are spying. This Novice has been rambling on about the assembly manual and how to put It together^ but how about after the kJt Is complete? Then what?
Glad you asked. This Is my first experi- ence with Ten -Tec, The operator's manual is weti written, nicely laid out, and teiis you everything you might need to know about the tuner, the circuits, adjusting the swr/power meter— If It ever needs adjust- ing—and how and why the tuner works. After talking with other hams at Guanta- namo Bay, I found out that the operator's manual Js standard Ten Tec— in other words, high quaiityn
Unplanned Benefit
An unexpected bonus of using the tuner was that It showed that my ground instal- lation needed work- The ground system I had was not as good as it should have been, which caused arcing between two terminals on the roller assembly. The grounding system adopted consists of a ik'UF capacitor soldered between the center lead and shield on each end of coax long enough to connect radios, tuners, ^tc*i with a good outside earth ground (see back Issues of 73 for detalis). This solved the arcing problem I had experi-
enced. Properly grounded^ the tuner ioads nearly everything^ and very nicely^ too.
Final Remarks
If you already own a "Super Whiz-Bang Automatic Antenna Tuner/Oog Walkeri Coffee Maker Detuxe," the Ten-Tec iWodel 4229 Antenna Tuner kit would make an ex- ceil ent spare for use during Field Day or emergencies. If you don't own a Super Whiz Bang, etc.^ and you want a good- looking, functional antenna tuner that you can assemibie yourself without the has- sies of scrounging parts and without a wailet-smashlng cash outlay, try the American-made Ten-Tec Model 4229 An- tenna Tuner kit.
Thanks for the photographic process- ing go to John Howard, President of the GTMO Reriej< Photo Club^ Guantanamo Bay; thanks a^so to my Elmer, Tim Mliier WB0RXX/'KG4TW, who was never too busy to ar^swer my dumb questions.
For more information, contact Ten- Tec, tnc^, Sevi&fviiie TN 37862.
James Sackey KA2SHM^ Great takes IL
DOCTOR DX FROM AEA
it was Saturday morning, and the CO WW DX Contest was in full swing. As my wife waiked past the shack, she voiced her familiar "Are you going to be on that radio all weekend?'* complaint. Moments Eater she ramembered that I didn't have an
antenna up! Obviously something strange was going on, for the sound of a raging contest was pouring out of the station speaker even though the rig was turned offl
Vve been blessed with an understand- ing mate, i explained that, yes^ I would be contesting all day Satu/day, and no, I wasn't planning to use a radio— in fact, all of the hams I had been talking with were random bits inside a computer's braln. This, of course, confirmed her earlier as- sessment of my mental faculties.
Etght hours later i had worked 541 sta- tions in 105 countries and had amassed a total score of 641,125 points. Without a radio.
This was my introduction to Doctor OX. the latest product from AEA. Doctor DX is a contest simulator. If s designed for the Commodore 64 and requires only an exter- nal CW key to operate. And I do mean operate!
After plugging the board into the back of your 0-64 and powering up, a sleek transceiver Is displayed on the screen. The rig features fuH ham-band coverage (10-160 meters), variable power output, and a digital frequency dispiay. A volume control and bandpass filter are also In- cluded. After setting the reai-time clock and defining your station's location (more about this in a moment), you are plunged Into the Incredible world of computer sim- ulation.
The contest is recreated in intricate de- tail. As in real life, you have the option to
Photo. A. Front view ot compteted kit.
either sit on a frequency and call GQ or huot-and-pounce. In both Instances, sta- tions will interact with you during the course of an exchange. Here's an eit am- ple, where 0N7TC is calling CQ on 14,028
0N7TC: CQ TEST DE ONTTC K
KK2Y: TC DE KK2Y
ONTTC: KK2Y "??? 14(1 missed the report}
KK2Y: RST?
ON7TC: 579 579 BK
KK2Y: R 5NN 05 GL
ONTTC: QSL TU QRZ QB ONTTC
Kote that the simulated station re- sponded to my query. Stations will also honor requests to ORS or QRQ and will re- peat any part of the exchange that you happen to miss. They will occasionally ask you for a repeat when QRM Is heavy or you are sending too fast.
Tuning up and down the band is accom- pushed by pressing one ot four keys on the 064, The higher end of each band is occupied by slow, inefficient stations. Dropping Into the Extra-class segment will allow you to contact super-stations running 30-40 wpm. No sloppy fists here — everyone sends computer-gener- ated codeE
Earlier I mentioned the real time clock. The program uses the time of day and your location in a propagation model that creates the conditions you might expect to hear on the bands. For example, I worked ZL and VK stations on 10 meters early in the morning, and later that afternoon moved to 15 meters, which was open to Europe. During the daylight hours, GO and 160 meters yielded nothing but Static, but excellent DX openings occurred on both of these bands after local sunset. Of course 20 meters was crowded with stateside big guns endlessly pounding out "CQ DX". The model seams to be very realistic and can be verified by comparing Doctor OX'S band conditions with the real thing.
Possibly one of the most exciting as- pects of Doctor DX is the ability to operate from any location on Earth. As mentioned above, the propagation mode! uses both time and location to create band condi- tions. You have the option to define any io^ cation you wish by supplying Doctor DX with the appropriate latitude and lon- gitude.
Ever wonder what It's like to live in Bur- ma? Key In 17N, 96E and you are there, ex- periencing conditions just as they would be if you made the trip. Like to activate Al- bania? Try 41 N, 20E and work the pileups! I took a trip to the Sudan and worked scores ol VUs on 160 meters!
Photo a Variable capacitor has mAnypSfts to ^s-sem^/e.
S2 73 Magazine * October, 1984
Photo C- your chot'oe of 3 co^x-ted antennas and a iongwtre or bafancsd-fine antenna.
On-screen scoring information is anoth- er outstanding feature. Doctor DX fS^ af tej' all-H a contesi stmulator/trainer. Complete statistics are displayed m real time and in- clude countri&sfeones worthed per band, aggregate countries/zones worked, num- ber of QSOs, points, and total score. Your contact rate, In QSOs per hour, is also given as an indication of ^our relative skiii — at one point I was cErpping along at 136 QSOs per i^our wiiite working a string of J As on 15 meters. This detailed infor- matron allows you to compare your oper- ating skill with that of others and to mea- sure the improvement in skill that comes with practice.
You may also use the scoring intorma- tion to participate in the AEA awards pro- gram. As in the real world, you can earn AEA-CC for 100 DX countries worked. AEA-AZ for contacting all 40 zones, 5-band AEA-CC, or be admitted to the AEA Honor Roll for working 350 DX coun- tri'es or more. A spec fat coding system generates a checksum figure that veriHes your achievement— no QSLs are required! in addition, AEA ptans to publish a list of the high-scoring stations In theif maga- zine ad each month.
This sJngie program is incentive to buy a C 64. I know it's tough to believe that a piece of software could so realistfcaiiy simiriate amateur radto, but it does. You absoiuteiy must hear it— a few times I caught myself reaching up for a knob to tweak!
I could talk myself blue trying to con- vince you thai this product is the most ex- citing thi^ng I've seen in my eleven years as a ham^ hut it isn't the same as experienc- ing it yourself. My final advice? Buy this program now\
For detailed information on Doctor DX, contact Advanced Electronic AppHca- ttons, PQ Box C'216Q, Lynwood WA 98036.
Perry Donham KK2Y 73 S(aff
BILALISOTRON40
When the box arrived in my office last Wednesday, I remember thinking; "Even Ralph Bilal couldn't fit a 40-imeter antenna into a package only 33" x 6"*/?" x 3",,, why, that's smaller than the boxes most model airplanes come in!"
Raiph had promised to send me the lat est version of this Isotron 40, a small, ver- satile antenna designed for limited spaces such as apartments, condos, camp- ers, and the like where it is almost impos- sible, for either (egal or physical reasons, to put yp a fuil-sized antenna. It's also rec- ommended, from the standpoint of si^e alone, to serve as an emergency , mobile^ or portable antenna that can be used in motel rooms ^ at a disaster site, or even bracketed to the bumper of an auto- mobile.
"All well and good," I thought, "but does it work?"
Unpacking
On Friday, after work, I took the box out of the trunk of my car and carried it into the workshop, wondering it Td be able to get it on the ai^r before dark. When i opened the box, the first thing I noticed was the neat packaging job done by Blial. There were two plastic bags containing hard- ware— good quality, plated hardware or aluminum hardware, depending on the use. ] wondered ft there was enough to go around; it has been my experience in the past to be shortchanged on nuts, bolts^ and washers. But not this time, as you'll see.
Each component or group of compo- nents was neatly wrapped and protected
with brown paper and packaging tape. There were four pre-drilled and bent alumi- num plates, one with an SO-239 UHF con- nector and a small standoff insulator al- ready mounted on it; there was a 31" length of clear plastic tubing, partiy wound with #12 insulated wire, with a riice foot- long lead and terminal soldered in place, and a piece of clear plastic tubing dt>OEJt 20" long, pre-dfiiled with hoies; there were a couple of pieces of Lucite* with holes in them, a piece of V-square aluminym tub- ing, and several other, smaller pieces that I couidn't immediately identify. Nothing elaborate or fancy, either— just plain va- nilla—and good oid-fashloned workman- ship. I began to beiieve that when Ralph Bilal toid you something, you had better believe it. My confidence was increasing by I he moment.
Assembly
The instructions include diagrams, step-by-step assembly comments^ arid a final tuneup procedure. After reading and rereading the instructions [somethif^g ( seldom do because the drawirtgs are clear, but in this case the antenna compo nents seemed so different in size and shape From anything I had ever seen be- fore that I figured that I had better read them carefully^ I began the assembly. Surprisingly, it went smoothly and with- out any probiems at ail: a new first for mei Everything fit into place and all the holes lined up perfectly with no bending, bind- ing, or mismatches anywhere.
Good heavens! So thaVs what this
thing looks like! {See photoj I couldn't imagine anything that ever looked less like an antenna! Oh. well, Ralph has been at this for over five years, so I had better trust him. He knows more about this thing than I do.
The 'far'" ends of the parallel rods were pre-driiied to accept typical TV-mounting hardwarei and the hardware itself was In- cluded^ U-boits, washers^ nuts, and plates of good, plated quaiity. Even the plastic bar had a dowei inserted In one end for re- inforcement—the result of experience and cut-and-try engineering.
The instructions suggested mounting the antenna on a short length of IV* "-di- ameter TV-mast tubing, and I fust hap- pened to have a five-foot length in the ga- rage. I mounted the Isotron "antenna" to the TV mast with the help of my %Yl who held things straight while I tightened the clamps. After all was square and aiigned, I did the final tightening of the hex nuts, and there it was! Clearly, something dif- ferent.
The weight was negligible and the wind loading laughable. Gosh, this thing could fit on top of almost any chimney bracket, on a mast alongside a trailer, or even In the shack in the middle of the floor! Yep, that's what I did, I happened to have a mili- tary surplus wooden tripod that had been used to mount a transit. The short length of TV mast exactly fit into the central coh lar, so I set it up In the shack (read spare bedroom) between the beds, A ten-foot piece of BG-B/U was enough to reach the operating desk and B&W coaxial switch mounted there.
Turie^Up and Operation
Here is where things usuatly begin to go very wrong, with my usuai luck, and I had little confidence that this ugly duckiing would ever be a swan in spite of Ralph Bilal 's confidence. Nevertheless, only 45 minutes had elapsed between opening the box and carrying the contraption to my shack. . .sort of a new record for me. There it sat on its tripod, daring me to fire up the rig and see what would happen. Okay, here goes.
Wow: signals— and quite loud, too! Put^ ting the rig on the lowest possible output power, just enough to get a vswr reading, I was astonished to get a reading of below 2:1 ^ and by careful adjustment of the amall^ paraflei "tuning" plates attached to the upper and lower "diamond" plates, I was able to get a reading of below 1.5:1 at 7025 kHz. That Is better than the standard trapped vertical i had been using was able to give me. i switched bach and forth be- I ween the vertical (roof mounted, with 12 radlals) and the Isotron 40. noticing that the ORN was appreciably lower on the Bilal antenna, whereas the received sig- nals were not much if any different in strength. Once again^ I was Impressed with this little critter. Now if it would only trans m it r i'd be happy.
Proof of the Pudding
Rather than timidly call a CQ, I decided to be brave and answer someone else. Af ter all, If he didn't come baci< to me ft wouidn't be my fault— or as disappointing —as if I had called and tseen found want ing. Okay, let's see. . . here's a good strong Signal at 7031 kHz. . ,KU1<a. . nice CW. . . theref he's signing, . .
KU1G KU1G, rfe WtXU, W1XU, K. W7XU de KU7Q; R R Tnx caii 0¥: ursfgs 599, 599 hrjn Monroe, d; name )$ John. Mm copy?AR. W1XU de KU1G, K.
Wow I 599 in Connecticut! Well, maybe that's ]usl an exception. Let's finish here with John and try another.
At 0O20Z (twenty after seven, iocal time) I heard WX4L calling CO. A quick shout and he came back; 559 in Gaffney, South Carolina. Name is Ed, Weil, that is more reasonable, I thought, isut still, all the way to South Carolina on an indoor "lump" ain't too shabbyf
Ne^tt, I called Steve K4CXJ In Nashville, Tennessee, and we compared antennas. The trapped vertical gave me a 569 with QS8 and the Blfal Isotron gave me a 569 with no QSBE The band wasn't great, but It was active.
Aiong about twenty before 9 i heard Biil K2SVC in Ithaca, New York, and he gave me a 599 with Some QSB. A quick compar- ison showed the outdoor vertical at S9
The isotron 40.
and the indoor isotron at SQ, Not bad, I'd settle for that any day.
After signing with Biil, I worked Jim. KXBE in Highland, Michigan. Jim said I was 599 there and claimed very little if any difference between the vertical and the Isotron, It was obvious that the band was improving and that the mid- range stations were skipping in loudly.
I wonder if I ought to try a "local" to see what happens, I thought. There was Paul KB1MJ/BS with his brand-new Extra-class ticket on 7024 kH2. Giving Paul a quick call, I got a 5S9 from him. He was down a bit, I thought, but the 569 i gave him was still a good report. When he told me he was running 20 Watts to a home-brew sta- tion (not just a transmitter^ I perked up. It seems that Paul actually loves to build gear, and his receiver Is about 9 months along h development. , , with a few more to go until he is satisfied. The keying was very nice, home-brew, of course, and Paul said he made the paddles, too!
The transmitter was a combined solid- state vfo with a lul;>e final, Nice. I sug- gested to Paul that when his station was completed to his satisfaction, maybe he ought to write it up for a magazine. . hint, hint! Let's hope he does.
Weil, It was getting late; maybe a cou- ple more and then to bed. Tuning around, 1 discovered Frank VE2GG in Dorval, Que- bec, on 7021 l^Hz, He came right back to my call: "599, DM ' He was about a 589 a! my station. Comparing antennas. Frank mentioned to me that the isotron was S9-t- 10 dB, whereas the outside antenna was only S9-I-5 dBP Here, the Isotron ac^ tually put out a better signai than the regu- lar antenna! Probably skip angle, etc., but who cares? The performance of the iso- tron 40 Is just plain phenomenal.
My last QSO of the evening was with Chuck N8FNZ in Detroit, He gave me a 589 and i gave him a 579 at 0354Z, six minutes before eleven o'clock local time. Chuck
was using his new Icom 761 and a dlpoie, sloping toward the east,
Wei 1, time for hitting the sack soon, so I signed with him after a pleasant rag-chew and switched off the rig. Welf satisfied with the evening's work, I decided to try SSB on Saturday morning. After all, with 75 Watts output, CW is a lot easier to cut the mustard than phone, I realized, so phone would be the finai proof I needed to see if the Isotron was reaily an antenna.
On Saturday morning at 9:50 local ttme, I heard W3DWI calling GQ. His signal was loud and i wanted to call him, but I had not changed the setting of the antenna to ad- just it for iowest vswr up here on phone. Nevertheless, I decided, what the heck; I'll just call anyway; no harm If he doesn't hear me. A short twotjy-two, and Ed In Chambersburg, Pennsylvania, came right back with a 5/7 report . . very little QSB. . . nice steady signal. We exchanged the usual Information and had a pleasant half- hour chat right in the midst of the Satur- day morning QRM.
When the QSB took me almost out J switched over to the outside antenna and was able to finish the QSO. So— we found out that under poor conditions, the out- side BIG antenna is a bit tietter than the small (tiny) Indoor one. Well, what's so surprising about that? That's what one would expect. . ,but I was still very satis- fled with the Isotron 40. Ralph hadn't lied to me yet; he hadn't overstated his perfor- mance figures; the antenna worked just as he said it would. Not only that. I firmly believe that if the isotron 40 were placed at the same height as my vertical and out- doors, it would work equally well! That's a lot to say, t>ul I think it Is a true state^ ment .. .and I'm going to prove It soon.
Later, after a long weekend of testing
73 Magazine * October, 1984 83
ttw intenna (during which time, nearly IDO sialtong were worked on phone arvd CW), a pattern became quite clear. Uniiifer good conditions the Isotron 40 nearly equalled the much higher putdoor vertical. Under pOOf cpnd^ions. ii was nearly three Sninits poorei. Oft the average, the tsotron was only orw io Iwa S-units dcwni cOfTipar^ with the veri^cal.
It will be d^iratrie to fTH>ijmt th« atitefv na outdoors at the same heigfit as the ver- tical for furthef cofTiparisoniS. I strongly t>e4l9ve, based on tests so far, that it could tw almost as effective as tire vertical^.
OihQf stations contacted \n the US were K4JE C589). W4LRD {579J, and W2JUF (S79V During the European Field Day. we worked ttie following foreign stationiS us- Ing the tsotfon AO: ON7AH/P (589). G3WKX {589), DUET (559). DLiOS P79), DLIAU (659), G4GXK (579), DKOTU (599i OFdCN (BiQ), PI4RT? (599), and GJ^3USL (699). Lal«f, I hsafd NQ6E in San Francisco, and Bob gave ma a 569, Of course everyone knows that all contest reports are not ex- act, but at least the antenna car work DX without a terrific dtsadvantage.
Many times my signal would be 58 on the Bilal antenna and S9 on the verttcal. In only orie caae, leported before, was Ihe laotrori better than the vertical.
Almost every station contacted In the US and Canada was very interested in knowing mofe about Itte Isotron. One o^ efator even said he was goir^g to buy the SO-nteter vefsion after hearing what the 4(MTieter wecston ctnjid do. So, there you hmm it, fans. Try one for yottrseff af¥t see whai fou think.
Tlworyol Operatloii
Tt^ ISOtron antennas may b^ capacttive hats on a loading coil. , .because Lhai's what they appear to be electticaJly. How- ever, ttie^e la a targe radiattng surface (ac- cording 10 flaiph) that would seem to make the Isolron antennas the equivalent Jn surface area to fuJI-sjze antenr^as. This does not Imply that the 'capture area" of the Isotron is the equivalent of the larger antenna, however, in spite of the small Slie(3V X 16^' X 12". approximately). It appears to be radiating quite efficienily— something that I had not thought possible with marety a loading coil wtth capacity hat as a radiator of rf energy.
The claimed bandwidth t>etween 2:1 vswr limits is 200 kHz, according to Ralph's measurements. I was able to ver I- ty Itiift apfiroximateiy tyy swinging be- tween roughly 706Q and 7250 kHz without retuniftg the antenna. However, fo* really Cf (Ileal wotk. It would t>e best to retune tt>e a^^tenna when movir>g from the low end dW portion to the high end SSB portion of Ihe bar>d.
Rglph mentions tr^e fact ttiat it is neces^ sary to ba vmy carefui in adiustmg and tufiirig the antenna tiecause the sviroMnd-
ings can affect its Empe^ance drastically. He give^ flome good counaei In the ln> struct ions atxtut this, and saverai feGom- mendattons to follow in case tuning up is a prdJlem. An rf noise bridge or similar 6&- vke lo be*p tuning is strongly reccxrv mended when setting up the Isotron fOf tMi^t performance^
Oih«T Aniennjs liy Eilal
Ralph Bilal can furnish a tSO^netei Iso- tron, an BOhTT^tm vision, and a SQ-meter version also. I wouldf like to say titat the one that looks most interesting to me is the combination 8QM0 tsotron — actually two antennas, luned to the bands, mount-
00 bi^k-lo4ftack on a sir»gle mast, and fed wilh two separate teedlmes- Living as I do In a home that rests in a small clear mg in the wocxls, that would really solve my an- tenna problem. 3 have used a chimney mount for several different verticals and small tieams, so I think It wou^d be very practical, simple, and nearly ideal in my location to solve the problem with the iso- tron system,
Conclusion
I really like the Isotron 40 and am gQifig to be very interested in trying out the other versions to see if they perform as well on
1 heir respective bands as this one does on 40 meters, Ceri airily the piice is reasorv able, considering what you qei: the "160- meter version that stands only S feel high arKJ welglis only 12 pourids (smaller than moAi two^metei tieams} for $t49,95 plus Shipping, the BChmefef versio^i at 4*^ fael and 7 pouncJs at $6395; the 4<MT^ter at 31 irvcfies and 4 pounds for ^2.9S. and th# 2(knetef isotron, on special sale at S38i;9S^ measuring only 21 incties and weighing in at a mere 3 po<unds. Finally, ttie 15-fnetef versi<Ki at 2i (rvches and 2 pounds, gKMft for $32.^. Ail of these mijsi have shipping costs added, varying ttetween $3,50 and
The eO/40 'Speciar Isotron comes (or only %^^0 plus Sfi.50 shipping cost, and Itwfe arc also 1 5-meter and lO-meler ver a Ions for hams, as wei5 as an 1 1 -meter vm- slon for CQ.
For your own Isotron, whatever It may be, caii or writs to the Bit at Company, S,fl, 2, Biicha OK 74342; {918^2534094, Tell Ralph that 73 sent you, with a strong rec- ommendation. Reader Service number 477.
Jim Gray W1XU 7J Staff
BARKER & WILLIAMSON S AP 10 PORTABLE ANTENNA
Nothing that simple will ever wcik.
TT»t was my first thought on viewing the Barker & Williamson AP-tQ Portable Antenna. I had seen ads in ham put^ltca- tions from B & W but bad always fust glanced at ttiem,
l^ow, however, for the tirst *ime In 15 years, I was faced with living in an apart- ment. I had changed iobs and moved from Gfiio to Wisconsin, and I discovered that our new apartment compiei: allowed ab- soiuteiy no outdoor antennas.
My fatf>er (K&MQ, a veteran DXer of many seasons, had purchased the B & W antenna for me as a Chrtstmas pHresent He did his t>est Iq convirrce me that this was tetter than no antenna at all, I decid- ed to give it a try- \\ wag a either thai or face the unpleasant withdrawal symp- toms associated with lack of exposure to Morse code.
Tha antenna had arrived \n a neat iitlie box with all of tha parts inside. The parts included a 22 Va -inch whip which tele- scoped Eo 57 inches^ colls for 10 meters through 40 meters (including 30 meters), a wire counterpoise, coax, and assorted screws and t>oltS- {W^'vs heard that the AP10 wiff load on 2 and 6 mefors wifhaut additioimi hardware, —£d4
Also included was a very ctearly written Instruction booklet Then again, the an- tenna was so simple that ttve instruction booklet necessarily was very basic and wail written.
Assemtity time was about 5 minutes and requtired only a screwdriver and a pa^r of piiers. To a seasoned DXef and this seo- ond-gervefation ham, it seemed too good to be true.
Not content to wait until I returned to Wlsconsm, we put ttte antenna on the air at my fattier s old hornestead in Ohio. Since the weather was a little nasty out- side, we decided to damp ihe antenna to a wooden table in the ham shack.
To make a long story shorl, the antenna worked. It's true we didn't work any exotic country on Ihe first try, but our GQ calls produced solid contacts on 40 meters with hams in several ea si -coast states.
Since both of us use antenna tuners for aii of our antennas, the B & W indoor whip was run through an MFJ tuner with 1000- Watt capacity. The swr was viriuaiiy a flat 1.1:1.
WHAT 00 you THINK?
Ha»e yov recently purchased a new product thai has been reviewed in 73? If you have, write and teH us what fOutr\mk about it, 7Jwitl publish your co^nments so you can share ttiem wiin other hams, as part of out continuing effort to bring you thie best m new product in*ormat*on and reviews. Send your thmjghts to Review Editor, 7^ Amatevf B&dtQS fechnicat Jonmai. Peterborough NH 0345B
tipon arriving back tn Wisconsin, I t>e- gan to have second thoughts about the antenna loading up property with my Tri- ton 4. After ail, that was a rugged an ten r^ tuner we'd used m Ohio. However, my wor- ries evaporated when 1 tunad ihe little whip attached to a wooden dresser in the bedroc^n with rrry DenTron Jr. Monitor tun- er. Swr i^Quld be ad|usted down to 1.4:1 throughout the CW portion of the 40-meter band I called CO and worked statior^ fron^ Colorado to New York itiat first evening.
Summoning up all of my courage several evenings later; 1 attached the SO-meter coil- The swr on this t>and could be ad|usted to l-l:l. and I wodied staf ions from Caiilomla to New Hampshire.
Of course, I was very pleased ar>d sur- prised tsy this kind of periormarice from a little indoor whip, In addition, \ felt confi- dent this little B & W product would keep me on the aiir even in the apartment-com- plex environment.
Needless to say, there are some com- promises and shortcomings one faces up to when using this Kind of antenna. You can't pul out a booming, dominating DX signal, and you don't always get 5^9 sig- nal reports, Fn addition, I have not tried the whip on SSB because i wori< 100% GW. I'm sure the results on voice trans mis- sions would be di^ppointmg with all of those t-kW (and 5~kW. too, I suspect) sig- nais on the a.ir,
Woddr^ with thjft antenna on CW is very similar to woffc^ng ORP. It takes a tit- tle rr^ore effort to hear the incoming sig- nals ar>d a little patience when transmit- ting, too. However. tt>e proof is in the pud- ding, and ttw B & W whip has proved it can keep me on tfie air. Unless the bands are totaliy quiet. I can QSO [ust alXHit any lime I want to.
For e)(ample, 1 have worked 30 stales on the 40'meter band, including California^ Oregon, Utah, and Maine. White signal re- ports are not always good, the fact still re- mains that hams In those places actually heard me wen enough to OSL
The 20-meter band has been even bet- ter, and I've actually worked a III tie DX, I have QSL cards from Haiti, Franca, and the Virgin Islands^ I have many more cards from ail over the United StateS^
While I'm not saying the B & W model AP-tO antenna should be contiidered as a primary station radiator when betler gear can 1^ instalied. I am saying that It appar- ently does the fob it was designed to do. it keeps hams in my situation on Ihe air. I'm grateful, because I'd hate to face those horrible symptoms of withdrawal brought on tiy ttie lack ol exposurs to Morse code.
For fuft)ier details. eor\(a<^l 6crk«r &
WfH^m&m, 10 Canai Stmt. Brhiot PA 19007.
Rkh Cochran WBflULZ/9 Kenvsha Wl
Chad Harris VP2ML
Box 4881
Santa Rosa CA 95402
AMATEUR RADIO IN WEST AFRICA
While tuning across 15 meters lacii!(ing for a clear frequency to call CO, I over- Si 73 Magazine • October, 1964
heard the foiiowing complaint from a group of W2 DXers; "Have you noticed that there aren't any Africans on the air? There are never any African stations around." I broke In and agreed with their observation that African hams were tew and far between. And then i signed my call, C5AAQ! While tho^e DXers got their wish of
wortclng an African stallon. many other DXers continue to lament the dilliculty of working many of the countries on the Afri^ can continent. A recent conversation with Tom Gregory N4f^JW gives some of the rea- sons behind I his difficulty, Tom was ata- tloned In the ivory CoasI for a tour of duty with the State Depart ment, and he signed TU2MW during his stay in West Africa. Tom cites two major problems for hams in West Africa: the drought and Ihe Instabill^ ty of many of the military gdvarnnents in the region.
The drought \n the region; began more than live years ago. The wesief^y winds which sweep across the coniineni Irom the If^dian Ocean seldom bring much rain
to the inland areas, which Is why the world's largest desert forms the tujlk of the land area of these countries. Bui cli- matic changes have made the water prob^ iem much worse in recent years.
The droughl affects amateur radio through the production of hydroelectric power. There isn't any. For many of the countries in the region. Including ivory Coast. Miger, Nigeria, Ghana, and Upper Volta, the lack of rain has run Ihe reser- voirs dry, and that means little or no elec- tricity En these countries.
Obviously, the lacK of oleclrfcity makes amateur radio much rrrore dillicutt, Wtrite many of the famifies whtch are wealthy Bfiough to afford ham radio can also ai-
ford a gas-drfven ef&ctric generator, that generator finds more use powering the drinking water distlllerv and keepfng the refrigerator going than handing out OSOs to deserving DXers.
Even when the power fs on^ th& coat of operating 3 radio can be extremely high in West AfrFca. When I was last in the region {1978), an American stationed In the re- gion could count on an electricity bill ot $500-1000 per month, j jst for household needs. You can fmagine the bill for run- ring a high-powered ham station for sev- eral hours a day!
However, the high cost {and frequent unavailability) of electric power is not the only problem facing West African amai- teyrs. Tribal conflicts, political corrup- tion, and staggering economic difficulties contribute to the highly volatile political situation In the region. Military coups and 01 her changes in government are com- monplaoe, and ham radio often loses out.
In the atmosphere of susptclon and In- trigue, anyone with sophisticated commu- nidations gear, such as a muHiband aima- teur transceiver, might be a threat to the existing government. And amateur radio rs probably out of the experience of many of the people making policy decisions in these countries, which simply adds to the suspicion.
Let's look at what happened in Ghana as an example of the problems facing ham radio ]n the region. During the mIKlary coup in 19Q2, some of the Americans working In Ghana eavesdropped on the action with a Bearcat 250 VHF scanner. Living through a coup is a terrifying expe- rience. Most official forms of news are cut off by one side or the other, and what you do hear is simply what they want you to hear, not necessarily what Is actually hap- pening. So this small group ot Americans used their scanner to monitor the military and government VHF frequencies.
Unforiunately for ham radio in Ghana, a Eocal African noticed this eavesdropping and reported the incident to the new powers that be. The new government was horrified to hear that someone could lis ten in on thelf supposedly-private radio communications and promptly arrested, the Americans as spies ^
Based on this incident, which really had nothing whatsoever to do with amateur radio, the new government tianned all am- ateur radio in Ghana and confiscated ail the rigs! When was the last time you heard a 9G station on the air?
The local amateur-radio club is working to get the ban rescinded, but it rs a long, glow process to convince all the appropri- ate officials that amateur radio is a plus for their country. One amateur, 9Q2XX, was a good enough friend of the Chai rman ot Ghana to get on the air, so perhaps nor- mal ham radio will return to Ghana soon.
Even in countries where amateur radio has not been completely banned, written itcenses are hard to come by. While the
appropriate officials in the PTT or other telecommunications authority might be agreeable to issuing a license, such a re- quest must also win the approval of the In- ternal seoyrity people ^ a much more diffi- cult task.
Whether this latter group goes under the name of Ministry of the interior, Inter- nal Affairs, or the Secret Police, their f unc t ion is the same: keep the present govern- ment in power. And permitting unrestrict- ed worldwide communications via ham radio is seEdom part of their efforts.
So a person applying for an amateur-ra- dio license in Ghana, N^lger. Upper Volta, Benin, etc, will usually find his request sitting on the desk of some oflicial in the Internal Affairs departments probably in- definitely.
Niger Is a good example. DXpeditioners Carl and Martha Hansen traveled to Niger 3n an attempt to activate this hard-to-work country. Tom Gregory happened to be in the country at the same time, but even their combined efforts proved fruitless. Neither party could get the required per- mission to operate.
On the other hand, as long as no written license is needed, l\ is possible to get ver- ba [ permission to operate. Nobody's Job ^or head) is on the line [If the ham does turn out to be a spy) if there are no written documents. And ham radio does have great value for emergency and backup communications, especially away from the larger cities. The MARS-iii^^e operation of several French stations in Chad is a good example. These "amateur" stations are running health and welfare traffic from outlying military posts back to France. But don't bother to break in; their documentation won't pass ARRL DXCC muster. Unfortunately for DXers, contacts with these amateurs usually do nof count for DXCC credit.
WorP(ii\g West Africa
So much for the bad news. Fortunately, there is some good news about amateur radio in West Africa. First, the region is ideally suited to excellent propagation. Sticking out into the Atlantic Ocean In the tropical latHudes around the equator, West Africa offers some super radio loca- tions.
Propagation to the States and Europe Is top-notch for many hours a day, and even the Japanese come through loud and clear along the all-water long path, around the tip of South America.
Tom Gregory suggests the months of September and October as good times to look for the West Africans. What rain they get inland falls mainly durtng that time. and electricity supplies are more reliable. Good radio propagation continues Ihrough the winter months, if the hydro power hasn't dried up.
As for the beat time of day to look for stations in this region^ Tom reminds DX- ers that local time in West Africa Is LFTC
As with stateside DXers, early-evening lo- cal time is when most of the amateurs sit down in front of their rigs. So search out those Africans in the 1600-2200 UTC range.
Tom spent a good deal of time on the lower frequencies, handing out contacts with his Kenwood TS830 and Alpha linear. Using a vertical on 40, Tom had good sue- cess working split frequency on 40-meter S3B, 7070 kH^ is a good spot to look for the Africans on 40, coupled with a listen- ing frequency between 7150 and 7200. 7167 is an especiaiiy pood "hole" in the heavy Interference in that part of the world. 2300 UTC is a good time to try 40.
75 meters is a difficuil band in Africa because of the extensive use of the 3SO0-kHz band for RTTY and other point- to-point communications in ITU Region 1. Sometimes you can't even hear the static crashes tsecause the interference level is so highf With the recent expansion of the US phone bands, Advanced licensees will get a crack at the 75'meter DX window of 3775-3B00. Tom made about 1000 con^ tacts on 75 during his slay as TU2tsiW,
While 160 meters is not an amateur band in Region 1, many countries have granted operating permission on Top Band. Tom wrangled 160-meter ope rating privileges, but had little success on the band. Dragging himsell out of bed at 5:30 in the morncng, Tom slugged it out on 160 to the tune of 5-10 contacts per night. Even the CQ Worldwide contest only yieided 6 160-nneter QSOs. Tom transmits in the DX window and fistens at 1818 kHz.
Tom made about 1 2,000 contacts dur- ing his tour as TU2NW, and he will be missed by those looking to confirm Ivory Coast, Anyone who hasn't yet confirmed their contact with TU2NW can do so Ihrough Tom's QSL manager, AK3F, Do not send cards to TU2NW through the bu- reau system. As with many visitors and DXpeditioners, the cards won't arrive in the country until long after the operator has departed. The chances of your bureau card catching up with the operator are very slim. Tom also operated as TU73 dur- ing the spring of 1934 (a special call sign granted for WPX contests). If you missed TU2MW. you stili can wori< Ivory Coast.. Tom reports that there are about 20 active amateurs in Ivory Oo^^t now, mostty French visitors. Assid TU1 BS is one of the more active hams, ar>d TU2JD occasional- ly runs plEeups in English.
DXpeditroners might find some of the
rarer countries very dtfficuit to activate for DXCG, but other countries in the region are good DXpedttion spots. In Mauritania, for example, Tom got his 5T5NW license in six minutes! Mauritania is somewhat unique in the region in that it only issues amateur-radio licenses to expatriates, not to locals! Other possibilities are Senegal, The Gambia, and Gabon. As with many of the French-speal^ing countries in the re-
gion, a letter written In French has the best chance of gaining a valid license. For anyone traveling to the area, Tom
suggests writing {\n French) to the PTT giving the usual Information about your operation: passport information, dates.
location, rigs, etc, A copy of your state- side license and a couple of photographs are also necessary. A ietter from your
local Chief of Police attesting to your good character is a valuable addition.
Since many of the amateur licensing authorities in the region work cEosely with the local amateur-radio club, it would be a good idea to Include the local club in your plans, A letter to the radio club at the same time as your tetter to the PTT licens- ing group can help speed your application.
Meanwhitei Tom Gregory is back in Afri- ca, this time stationed in Pretoria, South Africa. He reports that heshouldbeonthe air as t^J4NW/ZS6 by September. Then he expects to take the South African amateur exam to get his own ZS cali by the end of the year.
Since Tom's work for the State Depart- ment has him traveling around the region, he might show up from another country at any time. In addition to his TU2NW li- cense. Tom holds 5T5NW and J5NW. Cur- rent plans call for an operation from Swa- ziland 306 for the CO Worldwide SSB at the end of October.
In addition to the low-band frequencies mentioned above, you can look for Tom around 14155 or 14180, and 21255 or 21280. He runs RTTY with his Commodore 64 computer and he is often found on GW as well.
While in southern Africa, Tom has high hopes of breaking the logjam of amateur licensing in Mozambique. C9 amateurs have been nonexistent smce the commu- nist-leaning present government took power. However, recent breaks between the Soviets and Mozambique suggest that some changes might be in the offing.
QSL Manager Wanted
With his change in location, Tom Is looking for a new QSL manager to handle his 2S contacts and other operations in the region. Since he Keeps his log on a disk with his Commodore 64, a manager with the same computer equipped with a disk drive would be ideal. Tom can then send a floppy disk up once a month for the conf iirmations. If you are interested in this job, contact Tom Gregory at the Depart- meni of State. Pretoria, Washington DC 20520.
Meanwhile, enjoy the good propagation of the fall months. The next few summers are likely to be as lousy for DXing as the summer of '84, so concentrate on working what you can when the bands are open. And iook for T32AW from Christmas Is- land in the Pacific at the end of the month fincludJng CO Worldwide SSS). That's yours truly out there. QSL T32AW via K1RH.
DR. DIGITAL
Robert Swirsky AF2M PO Box 122 Cedarhurst NY 71516
THE DR. DiGrTAL POLL
It's hard to judge what interests the typ- icat Dr. Digital reader solely from the mail I receive. Only certain people are mot I vat-
ed to write letters; for most, the process takes too much time or effort. I am going to get around this problem by conducting a poll. While John Edwards^ "FUlsil" poll revealed some Information about the computer habits of amateur-radio opera- tors, it was not specific enough for my needs. So grab a pencil and answer the following questions.
Send your responses to the add f ess lisit&d at the top of this oolumn. You may keep
your responses anonymous.
1} Which microcomputer(s), if any, do you own?
a) Apple
b} Atari
c) Commodore
d} Epson
e) Franklin
f) leiVi PC
g) Osborne h)TRS-80 i}S-10O (IEEE 696) I i Other
2) Which computer ianguage(s^ are you proficient In?
a) Assembly language
b) Ada
c) Baste d)C
e) COBOL
f) Forth
g) LISP h) Pascal I) PU(
j} Other
3) Do you have any experience with minl- or mainframe computers?
a) Yes b}No
73 Magazine • October, 1964 85
1)abcdefghij ^abcdefghSj 3)ab
RESPONSE FORM
Read each question and mark your response by circling the appropriate letter next to the number of tlie question.
11) a b 16)at9
12) a b 17} a b
13) a b 18} a b
6} a b c d e
7) a b c d B]ab
4) a b c d e f g ti 5)abcd
g}ab
I0}ab
14} a b 15}ab
19) a b
20) a b
Connments:
4) What amateur radio applications do you have for your computer? a)HTTY
b) Control ot amateur-radio equip- ment
c} Record keeping (logs, contests, DXCC Issi, etc.}
d) Number crgnchtng (filter design, coordinate calculations, etc.)
e) Satellite tracking
t) Morse-code training g) SSTV
h) other
5} If you use computerized RTTVi which modefs) do you use?
a} Murray or Baudot
b} ASCI I
c) AMTOR d} CI TOR
6) How much tiave you spent on computer ec|u.ipment?
a) Under $500
b) 5500 to $T49&
c) $1500 to $2999
d) $3000 to $5000
e) Over $5000
7) What percentage of your computer pro- gramming is done in assembly language?
a} None
b) Under 33%
0} Between 33% and 66%
d) Over 66%
6j Have you ever built any computer hard- ware?
a) Yes
b)No
9) Have you ever des]gned any computer
hardware? a) Yes b)No
10) Have you ever made any repairs or modifications to your computer system?
a) Yes b)tslo
21) a b c d e 22)ab 23) a to 24}at> 25)abc 26} a b
11) Do you own any computer test equip- ment (i.e., logic probes, scopes, etc,)? a) Yes
b)No
12} To which hobby do you devote more time?
a) Computers
b) Amateur radio
13) Do you belong to a computer club?
a) Yes
bj Wo
14) Do you belong to an amateur-radio club?
a} Yes b)No
15) Are you In favor of a digital-class li- cense in the United States'?
a) Yes b)No
16) Which hobby have you been Involved
with longer?
a) Amateur radio b} Computers
17) Do you own a modem?
a} Yes b}No
18) Have you ever used a data base pro- gram, such as dBase 11, for amateur-radio purposes?
a) Yes b}No
19) If you had to choose only one hobby, which would you pick?
a) Amateur radio
b) Computers
20) Are you planning on purchasing more computer equipment In the near future?
a) Yes b)No,
21) What is your age?
a) 15 or below
b) 16-21
c) 22-39
d) 40-59
e)60 or above
22) Have you ever written any amateur-ra- dio computer software?
a} Yes
b}No
23) Have you ever purchased any amateur- radio computer software?
a) Yes b)No
24) Do you own a microprocessor-con- trolled rig?
a) Yes
b) No
25} What would you like to see empha- sized in this column?
a) Hardware
b) Software
c) Equal empasis on both
26) Have you ever used a packet repeater? a) Yes b)No
Feel free to add any additional thoughts or comments. It is hoped that the informa- tion I receive will assist me in choosing topics for the column.
ANOTHER APPROACH TO COMPUTER INTERFACING
Whenever I discuss computer-to-ama- teurradio interfacing, I always assume that the reader has a computer with a pro- grammable parallel port or some TT Lout- put lines available. Many computers, however, have only an RS-232 serial port available. This type of port is meant to carry ASCII data and is not suited to con- trol devices.
To get around this problem, a number of companies have developed serial liO con- trollers. These devices interpret certain ASCII characters from a serial pon and
use them to control relays or other switcti- Ing devices. With a serial liO conlroSler, for example, a TRS-lOO can be used to control electronic equipment without an extra I/O port.
One serial ]fO controller is the Sias Engineering C IP/35. This device will inter- face to any computer that has an RS-232 port. Using certain ASCII characters, the host computer can switch any one of eight relay-controJied outputs on or off^ The C IP/35 also has eight inputs that can be read through the sef iai port.
A controller such as the CIP/35 has some Interesting uses. If^ for example, a CIP^35 is used to control a repeats r. It can be connected with an auti>answer mo- dem to a phone line. The computer does not have to be located at the same site as the controller. This way, one does not have to dedicate a computer for control purposes.
Each output on the CIP/35 can handle 6 Amps. The eight inputs are opticaliiy iso- lated from the board. For more informa- tion on the CIP/35, contact Sias Engineer- ing, Inc, HK 1, Box 315, Salina^ Kansas 67401; (91 3)-823-8027,
TIPS ON CHIPS
A good way to learn digital electronics Is to learn about the various types of digi- tal integrated circuits on the market. Ev- ery manufacturer of Integrated cirGuits publishes spec sheets and data books de- scribing their product line. These publica- tions, which are usually available at modest cost, contain a great deal of use- ful infonriation.
One reference which \ use often is the National Semiconductor Oatabook. This publication lists many types of digital log- ic circuits ranging from simple NAND gates to complex mul lip lexers and shift registers. Chips are described using pin- out diagrams, truth tables, timing dia- grams, logical equations, and elect ricai characteristics. Applications notes are also given. For more information on this Databook, as well as other publications from National Semiconductor, contact National Semiconductor Corporation, 2900 Semiconductor Drive, Santa Ciara, Caiifornia9505l.
Some other companies that have \ov\h cost publications avatiabie are: Intel Cor- poration, 306S Sowers Avenue, Santa Clara, California 95051; Rockweii Interna- tional, Electronic Devices Division. 1842 Reynolds, Irvine, California 92626. When writing to these companies, ask for their "literature guide." Intei and Rockwell aiso have many free publications available. These, too^ are listed iin their literature guides.
CAN'T HAVE AN OUTSIDE ANTENNA?
The DX HIDDEN ASSET® Loop Antenna Installs Out of Sight, In Limited Space!
Available as a pre-cut, ready-to-assemble DXHA kit with plans, or plans only. Only a screwdriver required to install a kit in attic, closet or even base- nnent. A cubical space 1/8 wave length on a side will hold it. Requires neither ground connection nor radials. Provides a range at least equal to a dipole— local or DX— and has large capture area.
The DXHA can be vertically polarized onnnidirectional, or horizontally polarized, bidirectional and steerable. Other features:... low SWR at resonance... band width at 15:1 typically 3-5% of resonant frequen- cy... couples direct to 50<jhm coax... no balunor nnatcher..Jow~noise recep- tion...tunable.. .handles up to 1 KW.
Plans & kits: 2-nneter, rod & tubing at $39.95; others wood & wire with 6-nneter at $47.95; 10 meter at $54.95 & T5-nneter at $67.95. Others on special order, prices on request* Plans only $1250. Send check or M.O, to
H. STEWART DESIGNS
P.O. Box 643 - Oregon City, OR 97045 .^t67
480TR0N ANTENNAS
BIG ON PERFORMANCE SMALL ON SPACE
MODELS FROM 160^10 METERS
NO TUNERS! NO RADIALS!
PERFECT FOR LIMITED SPACE
APPLICATIONS: BOATS, APARTMENTS,
VACATION HOMES AND MORE.
eO-METER. S&S'^ plus $4" Shipping
40'METER. S52*= plus t3^ Shipping
ASK FOR PRICES ON OTHER MODELS
BILAL COMPANY
>^298
S,R.2, BOX 62, DEFT. 73 EUCHA, OK 74342 (918) 253-4094
86 73 M^gazme • October, 1984
VOICE OPERATED SQUELCH
• Fits inside most HF-SSB transceivers.
• Requires voice to actfvate. Ignores noise and hetrodynes.
• On/off switch only — no adjustments!!
• Connects to audio leads and 9 or 12 VDC-
• Fully assenbled and tested $99,95,
• Complete with comprehensive manual.
• Used worldwide in commercial and miiitary transceivers.
J^C^ COMMUNrCATIONS, 5479 Jetport. Tampa, FL 33614 • (813) 885-3996
ii«iriwi^™i~ra^minriTr-riri j^ ■
... at last . . . i;our shack organized!
A beautiful piece of furniture — your XYL will love »tE
$184.50 S-F RADIO DESK
L^
Deluxe - Ready to Assemble
#
4384
Also Avajiabif? . . '\QQf Space: 51 '■ W'de by 30'
$1 99.50 KEYSTONE AVENUE '
Designed with angled rear shelf for your viewing comfort and ease of operation
FINISHES: Walnut or Teak Stgin.
Floor Space: 39^^ Wide by 30" Deep
AdcJitianal Infofmatian on Request
Checks, yoney Orders.. Bank Amen card and Master Charge Acceplect
F.0.6, Culver City. {In Calii. Add 6% Sales Tax.) DEALER iwOUlRfES ih^VPTED
SI
i^e5
5-r flfliAleur Radio /?ivice#
CULVER CITY, CALIF. 9023Q — PHONE (213) 837-4670 ^
X-PANDA FIVE $15.00
[P\m %l.bi} Shipping & Hap>dllii<3.
Florida R*j5idents Add 5%. )
IForengn i>FdeTS please add 15.00 US funds for Shippina)
« .K-PANDA-!-1VB ctjiivtTts your HusikT or Hy-Gain m<ihili? ^nriMTiiEi hoyt^ fjtu' to ftvebtwids Ad J q^ rTi^inv resoni^tt^rs for ili^i biinds yo(U wish fo oper^le AiJjitSii r^ysoniitors for rnininium SWR, i"tC(.5lopping ten (.'fifinyL' bainls diiy more.
• X-PANDA-FIVE with propter r(>son,ators ftnd gocjtf ground plant^ makifsanideiil systt^m (or f^prirtmeiitiy
and condomtniiims.
• X-^ PANDA- FIVE ctin Lx.' used to miiks a miitti-bEand antyntia svsttrn for vans, carnpt'rs. iitolor h<.jrTies:. Wid naval irailers.
• X PAN I J A b I VH wil I '^^i mthi^r r egy l«r or supt r Nnmt^
GaJi
QTH
To: J.L. INDUSTRIES
P.O. Box 547, Hall^ndale. FL 33009
ATTENTION SUBSCRIBERS
We occasionally make our mailing list available to other companies or organiza- tions with products or services which we feel might be of Interest to you. If you prefer that your name be deleted from such a list, please fill out the coupon below or affix a copy of your mailing label and mail it to:
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73: Amateur Radio's Technical Journal
PO Box 931 Farmingdale, NY 1 1 737
Please delete my name from mailing lists sent \ to other companies or organizations. j
I
name
j address city
state
zip
I I
MOVING?
Let US know 8 weeks in advance so that you won't miss a single issue of 73.
Attach old label where indicated and print new ad- dress in space provided. Also include your mailing label whenever you write concerning your sub- scription. It helps us serve you promptly. Write to: ^9^^ Subscription Department
X ^ Amateur Radio's P. O . Bo x 93 1
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□ Extend my subscription one additional year for only $17.97 n Payment enclosed D Bill me
C^n^d^ & Me>^ico S20,97.n year onEy US Funds drawn on U5 hAn\i.. Foreign Surtaci? 125.00/1 ye^r only US Fund& dravvn on U5 bank. Foreign Airmail, please inquife.
I if you have no label handy, pr/nr OLD address here.
I I
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Name
Address City
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Zip.
I I I
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pf^ifjl NEW address here:
Name
Address. City
State
Zip,
ZJ
t^ See List of Adverifsers on page §S
73 Magazine • October, 1984 87
!^i
EIWC i^e)aO.QO0D/8171 wjth SIGOO and SK1306
SK300 and SK13DB Only.
(Tliese are all new not used.) Limited Supplv
S1200.00 $ 350.00
Km aiaRON]CS/!fC. W amplifier PC BOARDS AND RF TflANSISTOR tClTS.
Model m-m RF power input 2wotts at m lo l^m\i output 70watts li-5vdc m ICdips.
449.99 wltii (hiu K Boorxl Dnl^ moe MODEL PAIOl'WB RF Dcwer iiipiii liiwius ot I^rt to 1431 Iz outuut iiiOwatts 13.5vdc oi i8ac5.
189.99 rtim OQta PC Board Oily *B.99
GOIEVA CALCULATOR MATCH
This attractive watch has tlie following modes
Normal TiJBe Setting,
Calendar Settlxjg,
Daily Alarn Time Setting,
Weekly Alarm Time Setting,
Chrcmogcaph,
Ca ley la tor*
^Qr
Features! In Black Plastic
$18.99
or Featured in Stainless; Steel
$29,99
|
SILICON DIODES |
FEED THRU SOLDER RF CAPACTORS |
||||||
|
MR7 51 |
lOOvdc |
6Al!ipE |
10/ $5, 00 |
100/$33.00 |
470pf +-20% |
||
|
HR510 |
lOOOvdc |
3Ajiips |
10/33.75 |
100/$24,00 |
|||
|
HE? 170 |
lOOOvdc |
2 Amps |
20/$2<00 |
100/^15.00 |
5/$U00 or 100/S15.UO or |
||
|
IN 32 09 |
lOOvdc |
1 SAmps |
$2,00 |
10/ $15.00 |
1000/$IOO.OC |
1 |
|
|
BYX2 1/200 |
20Dvdc |
25Ajups |
$2,00 |
10/ $15,00 |
|||
|
1N2138A |
600vdc |
60 Amp 3 |
$5.00 |
10/ $40,00 |
1000pf/,001u |
if +-10% |
|
|
DS85-04C |
400vdc |
SOAmps |
$10.00 |
10/ $80.00 |
|||
|
1N3269 |
600vdc |
i 60 Amp 5 |
$15.00 |
10/$ 120, 00 |
4/$K00 or 100/$ 20, 00 or |
||
|
275Z41 |
300vdc |
250Ainps |
$20.00 |
10/$ 17 5- 00 |
[000/$t50.0C |
1 |
|
|
7-5754 |
300vdc 15KVDC |
400Aiiips ?Oni;*^ |
$30.00 $3.00 |
10/S250,00 10/ $20.00 |
|||
|
RC0-15 |
E FROHS |
||||||
|
SMFK20K |
20ICVDC |
20Ba. |
S4,00 |
10/ $30.00 |
|||
|
ia4148 |
signal |
30/SKOO |
100/ S3. 00 |
270S 1024x1 2716 2048x6 27L32/25L32 |
$2.00 each |
||
|
FAIRCHILD |
4116 16K DYKAMIC RAMS 200tts. Part i |
16iC7 5 |
$4.00 each |
||||
|
25 For S25 |
.00 |
or 100 For |
$90.00 or |
1000 For $750.00 |
flO.OO each |
||
|
HEWLETT PACKARD MICROWAVE |
DIODES |
||||||
|
IN 5711 |
(5082*2800) |
Schottky |
Barrier Diodes |
Sl.OO or 10 |
for $ 8,50 |
||
|
IK 57 12 |
(5082-2810) |
11 |
IT <l |
$1,50 or 10 |
for $10,00 |
||
|
XN6263 |
(HSCH-1001) |
If |
ir II |
S .75 or 10 |
for $ 5.00 |
||
|
50B2-2835 |
11 |
II 11 |
SI, 50 or 10 |
for S10,00 |
|||
|
5082-2805 |
Qija4 Hatched |
II |
per |
set 35*00 or 10 |
for $40,00 |
For Information csill: (602) 242-3037
Toll Free Number 800-528-0180 (For orders only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
(fU'^ll^ electrof|ici
"AM pans may be new or surplus, and parts may be substituted with comparable parts if we are out of stock o( a^ item. '
73 Magazme * October, 1984
"MIXERS"
WATKINS JOHNSON WJ-M6 Double Balanced Mixer
LO and RF 0.2 to 300MHz Conversion Loss (SS8)
Noise Figure (SSB) Conversion Compression
IF DC to 3D0MHZ 6.5dB Max. 1 to 50MHz 8.5dB Max. .2 to 300MHz same as above 8.5dB Max. 50 to 300MHz .3dB Typ.
$21.00
WITH DATA SHEET
NEC (NIPPON ELECTRIC CO. LTD. NE57835/2SC2150 Microwave Transistor
|
NF Min F-2GHZ |
dB 2.4 Typ. |
|
F=3GHz |
dB 3.4 Typ. |
|
F=4GHz |
dB 4.3 Typ. |
MAG F=2GHz F=3GHz F=4GHz
dB 12 Typ- dB 9 Typ. dB 6.5 Typ
$5.30
Ft Gain Bandwidth Product at Vce=8v, Ic=lOma. GHz 4 Min. 6 Typ, Vcbo 25v Vceo llv Vebo 3v Ic 50m. Pt, 250mw
UNELCQ RF Power and Linear Anplifler Capacitors
These are the farnous capacitors used by all the RF Power and Linear An^lifier rranuf acturers , and described in the RF Data Book.
5pf
5.1pf
6.8pf
7pf
8.2pf
lOpf 12pf 13pf 14pf I5p£
18pf 22pf 25pf 27pf 27 . 5pf
30pf 32pf 33pf 34pf AOpf
43pf 51pf 60pf 80pf 82pf
lOOpf llOpf 120p£ 130pf 140pf
200pf 1 to 220pf 11 to A70pf 51 up 500pf lOObpf
lOpcs
5 Opes
pes
SI. 00 ea $ .90 ea $ .80 ea
NIPPON ELECTRIC COMPANY TUNNEL DIODES
Peak Pt. Current ma. Ip
Valley Pt. Current ma. Iv
Peak Pt. Voltage mv. Vp Projected Peak Pt. Voltage mv. Vpp Vf=Ip
Series Res. Ohms rS
Terminal Cap. pf. Ct
Valley Pt. Voltage mv. VV
MODEL 1S2199 9inin. lOTyp. Umax. 1.2Typ. 1.5max. 95Typ. 120max. 480min. 550Typ. 630max 2.5Typ, 4max. 1.7Typ. 2[nax. 370Typ.
1S2200 *
9min. lOTyp. Umax.
1.2Typ. l.Smax.
75Typ. 90max.
44Qmin. 520Typ. 600max
2Typ. 3max.
5Typ. 8max.
350Typ .
FAIRCHILD / DUMONT Oscilloscope Probes Model 4290B
Input Impedance 10 meg., Input Capacity 6.5 to 12pf . , Division Ratio (Volts/Div Factor)
10:1, Cable Length 4Ft. , Frequency Range Over lOOMHz.
These Probes will work on all Tektronix, Hewlett Packard, and other Oscilloscopes.
PRICE $45.00
I
k
MOTOROLA RF DATA BOOK
Listsall Motorola RF Transistors / RF Power Amplifiers* Varactor Diodes and much much more.
PRICE $7.50
For information call: (602) 242-3037
Toll Free Number 800-528-0180
(For orders only)
^/l^^^x electrof|ic§
"AM parts may be new or
surplus,, and parts may b© substituted with comparabEe parts ff we are out of stock of an item."'
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine • October, 1984 89
RF TRANSISTORS, MICROWAVE DIODES
■
TYPE
PRICE
■KPE
PRICE
TWE
PRICE
ITPE
PRICE
|
2N1561 |
$ 25.00 |
|
2N1562 |
25.00 |
|
2N16^ |
25.00 |
|
2N2957 |
1,55 |
|
2N2S57JANrS |
4.10 |
|
2K2857JAM^T |
4.10 |
|
2N2876 |
13,50 |
|
2EI2947 |
18.35 |
|
2N2048 |
13.00 |
|
2N2949 |
13.50 |
|
2N3375 |
17.10 |
|
2N3553 |
1.55 |
|
2N3G32 |
15.50 |
|
2N3733 |
11,00 |
|
2Ky8lB |
5,00 |
|
2N3S©6 |
1,30 |
|
2N3S66JAM |
2.20 |
|
2^392-1 |
3.35 |
|
2,^33927 |
17.25 |
|
2M39S0 |
25.00 |
|
21*1012 |
11. CX) |
|
2N4041 |
14,00 |
|
2N4072 |
1.80 |
|
2N4080 |
. 4/53 |
|
2M127 |
21.00 |
|
2N4427 |
1.30 |
|
2N4428 |
1,.S5 |
|
2M430 |
11.80 |
|
2N4957 |
3.45 |
|
2N'1959 |
2.30 |
|
2M5090 |
13.80 |
|
2N5108 |
3.45 |
|
2N5109 |
1.70 |
|
2N5160 |
3.45 |
|
2^^5177 |
21.62 |
|
2iN5179 |
1^04 |
|
mr32m |
56.00 |
|
2N5583 |
3,45 |
|
2N558S |
9.77 |
|
2N5590 |
10.92 |
|
2N5591 |
13. SO |
|
2M5637 |
15.50 |
|
2)^5e4X |
12,42 |
|
2K5642 |
14.03 |
|
2N5643 |
15.50 |
|
2fv5e.i5 |
13.80 |
|
2iN5646 |
20,70 |
|
2N5651 |
11.05 |
|
2N5^01 |
ltt,00 |
|
2N5764 |
27.00 |
|
2N5S36 |
3.45 |
|
2N5S42/M1607 |
8.45 |
|
2N5S49 |
20.00 |
|
2fJ59l3 |
2.25 |
|
2No9l6 |
3e,oo |
|
.2N5322 |
10,00 |
|
2N5923 |
25.00 |
|
2N5tMl |
23.00 |
|
2N5942 |
40.00 |
|
2N5944 |
10.35 |
|
.2K5945 |
11.50 |
|
2N5945 |
14.40 |
|
2?Jf>0^0 |
10.35 |
|
2I*60S1 |
12.07 |
|
2Ne082 |
12.65 |
|
2iN60e3 |
13.25 |
|
'A^fOM |
15.00 |
|
2M6094 |
11.00 |
|
2mm5 |
12,00 |
|
2H6096 |
16.10 |
|
:f2Ni3097 |
20.70 |
|
2rfl5105 |
:^i.oo |
|
2N61;K |
21,85 |
|
2Neia6 |
40.24 |
|
2N6201 |
50,00 |
|
.2N6304 |
1.50 |
|
2N64&9 |
18.00 |
|
2ti6567 |
10,0*? |
|
2N66S0 |
80.00 |
|
3SC703 |
3.00 |
|
2SC756A |
7.50 |
|
2SC7S1 |
2,80 |
|
2scioia |
1,00 |
|
2SC1(M2 |
12.00 |
|
2SC:i070 |
2.50 |
|
2SC1239 |
2.50 |
|
2SC1351 |
12.00 |
|
2SC1306 |
2.90 |
|
2aCl307 |
5.50 |
|
2SC1434 |
2.80 |
|
23C1678 $ |
2.00 |
H1134 $ |
16.90 |
M3C1821-3 |
$125,00 |
|
2aC1729 |
20.00 |
M9579 |
7.95 |
ft©Ci821-10 |
325.00 |
|
2SC1760 |
1.50 |
MB5S8 |
7. .50 |
Hscrpiooi |
40.00 |
|
2SC1909 |
4,00 |
M9622 |
7.95 |
MSe22?.3-10 |
200.00 |
|
2SC1946 |
36.00 |
At9623 |
9.&5 |
MSC^OOO |
50.00 |
|
2SC1946A |
40.00 |
^^9624 |
11.95 |
.^tscsooi |
50.00 |
|
2SC1970 |
2.50 |
M9625 |
17.95 |
ASSC73O01 |
50.00 |
|
23C'1974 |
4.00 |
MSX530 |
18.00 |
Rscsaooi |
40.00 |
|
2SC2].66 |
5.50 |
M9740 |
29.90 |
N^£CS2014 |
40. 00 |
|
2SC2237 |
32.00 |
M9741 |
29.90 |
H3C820(20 |
40.00 |
|
2802095 |
47.00 |
liS755 |
19,50 |
MSC82030 |
40,00 |
|
A50-12 |
25.00 |
M964S |
37.00 |
MtSC83001 |
50.00 |
|
A209 |
10.00 |
M9850 |
16.90 |
^LSCH3005 |
100.00 |
|
A283 |
6,00 |
M9S51 |
20.00 |
MT4150 |
14.40 |
|
A2S3B |
6.00 |
M9887 |
5.25 |
MT5T26 |
VOR |
|
AF102 |
2.50 |
!vIEL80091 |
25.00 |
Nfr5596/2N5596 |
99,00 |
|
AFYl^ |
2.50 |
11IM1550 |
10.00 |
ifr576a/2N576S |
95.00 |
|
BF272j\ |
2.50 |
MM1552 |
50,00 |
m^762 |
POR" |
|
BFR21 |
2.50 |
mi553 |
50.00 |
NE02136 |
2.50 |
|
Hi-'iiSO |
i.od |
M0.614 |
10.00 |
NE137S3 |
POR |
|
BFtJSl |
1.65 |
1&I19^13/2N4072 |
1.80 |
NE21339 |
K)tl |
|
RFFE99 |
2,50 |
MKt26aS |
5.00 |
Nlib7a35 |
5.70 |
|
wnp, |
2.50 |
mo375A |
17.10 |
NF:73436 |
2.50 |
|
RFWieA |
2.50 |
MM4429 |
10.00 |
IKW |
|
|
i^m.7 |
2,50 |
HM8000 |
1.15 |
PKTmZl |
PQft |
|
rm92 |
1.50 |
MMSCXB |
2.30 |
FT3190 |
Pt)U |
|
RFM4 |
2.50 |
MM8011 |
25.00 |
'm'6l94 |
POR |
|
Kh'X48 |
2.50 |
MPri02 |
.45 |
Fi3195 |
POR |
|
BE'XSS |
2.50 |
MPSU31 |
1,01 |
Fi'3537 |
7.80 |
|
BFX84 |
2.50 |
MEWi2023-l,5 |
42.50 |
PT4166E |
POR |
|
Brxs5 |
2.50 |
ltiKF2{J8 |
16.10 |
l'r4176D |
POR |
|
BFXS6 |
2.50 |
MRF212 |
16.10 |
PT4l8bT? |
POR |
|
BF5^9 |
1.00 |
MKP223 |
13.25 |
PT4209 |
POR |
|
RFYll |
2.50 |
MHF224 |
15.50 |
PT4209C/5645 |
pcm |
|
BFY18 |
a. 50 |
MHF231 |
10. a2 |
PT4556 |
24.60 |
|
BFYIS |
2.50 |
Mra^32 |
12,07 |
PT4570 |
7.50 |
|
KFY39 |
2.50 |
}fW^33 |
I2,a^> |
PT>4577 |
TOR |
|
RFY90 |
1.00 |
MRt^S? |
3,15 |
Fr4590 |
POR |
|
Br,XP7 |
15,24 |
ltRF23S |
13.80 |
PT4612 |
POR |
|
RfX68C3 |
15.24 |
tiR>'239 |
17.35 |
Pr4628 |
POR |
|
HLK93C:3 |
22.21 |
MRF245 |
35.65 |
Fa^4(>40 |
POR |
|
BL4Y87A |
3.94 |
MRP247 |
35.65 |
Pr4642 |
POR |
|
:BL¥88C3 |
13,08 |
MRF304 |
43.45 |
1^5632 |
4,70 |
|
PIi¥94G |
21.30 |
MHFJ09 |
33.81 |
Pl*^749 |
POR |
|
RT.Y351 |
10.00 |
MRF314 |
2H.52 |
FJ16629 |
POR |
|
m,Y56SC/CF |
30.00 |
MRF315 |
28.86 |
1^16709 |
POR |
|
0458-617 |
25.00 |
MRi'316 |
POR |
i'iiB720 |
pa^ |
|
C4005 |
20.00 |
mt^ju |
63, S4 |
PiK510 |
pcm |
|
•mi899 |
20.00 |
MRf^420 |
20.00 |
Plia524 |
POft |
|
iisiss |
18.00 |
MRF421 |
36.80 |
PT8609 |
PfH |
|
fTT-^54S |
25.00 |
MRl-n22A |
41,40 |
P'i'8633 |
PGR |
|
C1TC3005 |
100.00 |
MRF427 |
17.25 |
PiB639 |
POR |
|
Dexcel GaAs FET |
MRf42S |
46.00 |
P1^S659 |
POR |
|
|
nKL3501A-P100F |
49.30 |
MRF433 |
12.07 |
P18679 |
POR |
|
Piijit.su QsJk^ J^LT |
li1Kt449/A |
12.65 |
P1B70S |
PCSi |
|
|
ESX52WF |
5S.00 |
MFff'4S0/A |
14.37 |
FrS709 |
POR |
|
<M)29aA |
2.50 |
MRF453/A |
18.40 |
F1^727 |
29,00 |
|
HT^P76 |
4.95 |
MKi'454/A |
20.12 |
PT8731 |
POR |
|
Ht:PS3002 |
11.40 |
MRF455/A |
16,00 |
Fi^742 |
19.10 |
|
HHPS3003 |
30.00 |
^tRF458 |
20.70 |
M^787 |
POR |
|
HH^3005 |
10. oo |
MRF463 |
25,00 |
Vly/83 |
16.50 |
|
HEPS3006 |
19.90 |
ma'4T2 |
1.00 |
PT9784 |
32.70 |
|
hb^SSOOl |
25.00 |
MRF475 |
3.10 |
Piy790 |
56.00 |
|
tTT-psaoio |
11.34 |
^fHl'^76 |
2.00 |
pTJises |
POR |
|
He!ft'lett Paclsirta |
MRF477 |
14.05 |
Fr31963 |
PCR |
|
|
.HFI?r£204 |
112.00 |
^^RF492 |
23.00 |
Pt3mm |
POR |
|
3582 IE |
ris.oo |
MBFSm |
1.04 |
pi'jiseso |
POR |
|
35826B |
:^.oo |
HKF503 |
6.00 |
RCA |
|
|
358261!: |
32,00 |
MRF504 |
7.00 |
40081 |
5.00 |
|
35831B-1131 |
30.00 |
MHF509 |
5.00 |
40279 |
10.00 |
|
35e3rE |
30.00 |
MRt''511 |
10,69 |
40280 |
4.62 |
|
35^32E |
50.00 |
MRF515 |
2,00 |
40281 |
10.00 |
|
35833E |
50.00 |
MRF517 |
2,00 |
■40282 |
20.00 |
|
:3.'"^853E |
71 . 50 |
Mni^59 |
2,05 |
■40290 |
2.80 |
|
•35854E |
75.00 |
^tRF605 |
20.00 |
40292 |
13,05 |
|
35866E |
44.00 |
mt%nB |
25,00 |
40294 |
2.m |
|
HXUKSlOl |
7.00 |
MRFS28 |
8.65 |
'1 0341 |
21,00 |
|
Hrm3l02 |
a. 75 |
mFa22 |
3.45 |
40008 |
2.48 |
|
HX'iK5104 |
30.00 |
.Sllffm4 |
27.60 |
40894 |
1.00 |
|
fmiiiUCM |
66.00 |
wwme |
29.90 |
40977 |
10. 00 |
|
HSi'H6105 |
31.00 |
MRiBtil6 |
1S.(X) |
:62S0OA |
60.00 |
|
HXlli6l06 |
33.00 |
Mlff823 |
20.00 |
RE3754 |
25.00 |
|
J310 |
,70 |
MIff^J?01 (3) Lead |
1.00 |
RE3789 |
25,00 |
|
TOW |
MEtraOl (4) U^ad |
2.00 |
SFllO |
25.00 |
|
|
^UdOOO |
10,00 |
MmrB&i |
2.30 |
S50-12 |
25.00 |
|
joeooi |
25,00 |
MRF911 |
3.00 |
S3006 |
5.00 |
|
Jt>3045 |
25.00 |
MRF961 |
2. 3D |
S3031 |
5.00 |
|
Matoi^la Ojtitl. |
MRt^004 |
2,10 |
.<5CA:dS22 |
5.a<:) |
|
|
mi3i |
8.5t5 |
MS26lf |
pm |
SCA3523 |
5.00 |
|
M1132 |
11.95 |
M.SCl 720-12 |
225,00 |
PRiaH m REQUE |
ST = POii |
Toll Free Number 800-528-01 80
(For orders only)
"AM parts may be new or surplus, and parts m^y be substituted with comparable parts
if we are out of stock of an Item."
t
For information call: (602) 242-3037 ^^-«
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
(f\f^z electroiycg
90 73 Magazine * October, 1984
GaAs, TUNNEL DIODES, ETC.
t R y 'VM^Sl&VCBS *
SD345
SD445
SDI004
$01009
5DtOQy~2
SD1012-
SD10J3^3
^1013-7
SD1014
3D1014-6
SDlOje
SD1016-5
5010 IH-^
soioxa-^ ajioia-7
S0I018-1S
5DI02tJ SD1030-2
3D1M3
301043-1
SD1045
SD1019-1
SD1053
SDIOBS
SD10(?S
SD1074-2
SD1074-4
5P1074-5
SD1076
SD1077-I
SD1077-6
SD107S-6
SDIOSO-^
3l>10Sa-1?
SD1037
SD10S9-a
SD1095
sa)iioo
SD1109 !S»lli5-2 SDl 115-3 SDl 115^7 SD1116
soma
PR I a:
I 5.00 5.00 15,00 15* CM 15.00 9.90 9.90 9.90 13.50 13.50 11.00 11,00 15.00 15.00 15.00 15,00 15.00 15.00 10- 00 15. OO 12.00 12.00
:o.oo
3.75
a. 00
4, op
4.75
15.00
18.00
28.00
2S.0O
JSO.OO
4.00
4.00
24.00
6.00
3.00
8*00
15.00
15-00
15.00
5.00
18.00
s.oo
8.00
2.50
5.00
22.00
|
'ITPE |
PRICE |
vn^E |
|
soil 19 |
$ 5*00 |
Sl>t27S-& |
|
SD1124 |
50.00 |
SD1231-2 |
|
SU1I2T |
3.50 |
SD1233 |
|
SOI 133 |
14.00 |
SD1289-1 |
|
SOI 133-1 |
14.00 |
SD1290-^ |
|
SDli:^-3 |
3,00 |
SD1290^7 |
|
soil 35 |
8,00 |
aoisoo |
|
ajii:i6 |
15.00 |
SDlSOl--? |
|
SDl 136-2 |
15,00 |
3D13£>5 |
|
SDl 143-1 |
12.00 |
SDT307 |
|
SD1I43-3 |
17.00 |
SDiaoe |
|
SDl 1 44-1 |
3.00 |
SD1311 |
|
301146 |
15.00 |
SD1317 |
|
SDl 147 |
15.00 |
SD1335 |
|
S0118S |
10.00 |
SD1345-6 |
|
soiia9 |
24.00 |
SDl 365-1 |
|
soisoo |
1.50 |
a31365-5 |
|
so 1201-2 |
10. oo |
SDl 375 |
|
SO 12 02 |
10.00 |
ED1375-S |
|
SD12 12-11 |
4.00 |
aJ1379 |
|
5011212-12 |
4.00 |
SDir^C^l |
|
a)12 12-10 |
4.00 |
fiD13eO-3 |
|
SD1214-7 |
5.00 |
SD13fiO-7 |
|
SD12 14-11 |
5.00 |
SD1405 |
|
SD1216 |
12,00 |
SD1409 |
|
SD1219-4 |
15.00 |
SD1410 |
|
SO.1219-5 |
15.00 |
SD1410^3 |
|
S0t2l&-S |
15.00 |
SD1413-1 |
|
S01220 |
8.00 |
SD141G |
|
sn:i22o-9 |
e.oo |
ED1422-2 |
|
SD1222-& |
le.oo |
SD142S |
|
ED1222-11 |
7.50 |
^^142^2 |
|
£3^1234-10 |
la.oo |
S01423-3 |
|
SD1225 |
18,00 |
SD1429-5 |
|
3D1S23-3 |
FOR |
SD1430 |
|
^1229-7 |
13.00 |
SD1430-2 |
|
SD1229-ie |
13.00 |
SDl 434-5 |
|
.Sin232 |
4,00 |
SD1434-9 |
|
301240-3 |
15.00 |
SD143S |
|
ED1244-1 |
14.00 |
SD1441 |
|
SD1362 |
12,00 |
201442 |
|
S:]12e3 |
15.00 |
SD1444 |
|
S:i263-1 |
15.00 |
SD1444-8 |
|
SD1272 |
13.00 |
St)I450-l |
|
SD1272-2 |
15.00 |
3D1451 |
|
SD1272-4 |
15.00 |
SD1451-2 |
|
SD127a |
30*00 |
SD1452 |
|
SiJl27tJ-l |
18-00 |
3D1452-2 |
S18.00
8.00
10.00
15.00
15.00
15,00
3.00
3,00
3*00
3,00
3.00
1,00
10.00
3.00
5,00
2.50
2.50
7,50
7.50
15.00
1.00
1.00
1.00
40.00
18.00
22.00
21,00
IS. 00
50,00
24.00
33.00
15.00
15,00
15.00
12*00
xs.oo
30. Of) 30.00 26.00 91-00 15.00 6.00
e,oo
28.00 18.00
18.00 20,00 20.00
TYPE
SD1453-1
SD1451-1 SD1477 • SD1478 SD14S0 SD1484 ^1484-5 a:?148'l-6 SD14S4-7 SD14fiS SD148fi-l 5014 J^J^ 7 S014S8-S SLH49*->-l SDT.520-2 SD1522^1 S0IS2H- 1 SDlS2fi-3 aDlS3C>-2 ^1536-1 SD1545 SDl 561
PftlCT:;
$48,00 48,00 48, fX) 21.00 60.00 1*50 1*50 1*50 1.5b 39.00 38.00 27. W) 28.00 3S).O0 18.00 33.00 24.00 34,00 38. W 41.00 34.00 79.00
gF4557 Mot. 25.00
SK3048 HCA 5.00
SK3177 RCA 15,00
S^]37714 Mut. 2.50
SfiF7S0 mt, 36.00
SRFime M3t, i^*00
SBT2M7 Sfot, 22.00
SRI-2356 ii>t, 38.00
SRF237S htTJt, 16.00
SRF2534 Mctt. 40.00
SRF2fl21 ^tJt. 25.00
SRF2S57 Mcjt* 20.00
TAggy4 fCA 15.00
Tisiea/JHu-^ee 3.55
1P312 2.50
TP1014 TOW 5.00
IPlOaS TOW 15.00 01-80703T04/ 458^949 Mot.amn. 65,00
TXVF2201 H.P. 450.00
e2803 RCA 100.00
TA7205/2N5921 SO. 00
TA74S7/ 2N5920 75 . 00
TA7995/2N6267 150.00
SRF2092 Mot. 18*00
M1^^479 8.05
Vfe Caj] Ct^oss Reference Most RF Transistors, Diodes, H^'brid Modules And Any Other Tyix^ Of Semiconductor.
****++*•♦
|
1N21 |
¥ 3.40 |
|
1^E1D |
4.00 |
|
1H21WE |
5,80 |
|
LN23B |
3,40 |
|
LN23m |
4,00 |
|
1N2SWE |
10. 00 |
|
1JM76 |
26.00 |
|
1N78B |
26.00 |
|
1N149 |
6.00 |
|
1NIJ15G |
15,00 |
|
IM331 |
10.00 |
|
IN2930 |
15.00 |
|
IK3713 |
IS. 00 |
|
1S3717 |
14.00 |
|
L^[3747 |
21.00 |
|
1MS12B |
9,00 |
|
1W5142A/B |
4.25 |
|
1N5146A/B |
4,25 |
|
1N5453 |
3.75 |
|
IN5713 |
5.00 |
|
1S2200 |
15.00 |
|
A2KlieM Aertedi |
50.00 |
|
BU61 Dornac |
5,00 |
|
M233B Alpha |
PUR |
|
rSMTC AlpJm |
POH |
|
PG061.58-9S Alpha |
PGR |
|
GCJ 631-89 GIIZ |
31.35 |
|
GC2542-4e GHZ |
37,40 |
|
tEP5082-Oll2 |
14.20^^ |
|
111^032-0375 |
KM |
|
HP5082-1028 |
POH |
|
HP5O33-2303 |
5.20 |
|
HF5082-2aOO |
1.00- |
|
H1>50S2-30:^ |
6.70 |
|
UP50S2-3379 |
1.50 |
|
HP5082-S01G |
POR |
|
MA475 |
poe |
|
iiA41766 |
POR |
|
MA43e36 |
POR |
|
MA47100 |
3.05 |
|
^ti\47852 |
pm |
|
1N2TT^ |
$ 3-40 |
lM2im |
$ 3.40 |
LN21C |
$ 3.40 |
|
liNSlDlt |
4.00 |
iieiER |
6.00 |
ll^lRF; |
5.00 |
|
1N21WG |
5.80 |
irJ32 |
5.00 |
IN23A |
10.00 |
|
1N23C |
3.40 |
lN23at |
3,40 |
l^a3D |
4.95 |
|
1N23WK |
5.00 |
1N2S |
7.50 |
LN25AR |
18.00 |
|
tN2:y |
10.00 |
im'? |
20.00 |
USf53A |
55.50 |
|
wim |
38.00 |
mru |
26.00 |
1N7!^A |
20.00 |
|
INTSD |
28.00 |
mrsm |
28.00 |
IN7SH |
28.00 |
|
IN150MR |
18.00 |
1IS415 |
4.00 |
u^loC |
4.00 |
|
L^16D |
5.00 |
imi6K |
6.00 |
IM446 |
10.00 |
|
liN833 |
10.00 |
ira50 |
4.O0 |
IN1084 |
2.00 |
|
1N2932 |
15.00 |
1N3540 |
15.00 |
11^3712 |
11. OQ |
|
1N3714 |
U-'OC |
1N3715 |
16.00 |
IS3716 |
10.00 |
|
im7i& |
10.00 |
1N3721 |
14.00 |
LN3733 |
10. 00 |
|
1N43S6 |
20.00 |
lfW396 |
15,00 |
1M785 |
11.00 |
|
LN5139A/B-: |
4.25 |
1N5140A/B |
4.25 |
1N5141A/B |
4.95 |
|
1N5143A/E |
4.25 |
1X^144A/B |
4.25 |
US[5145A/B |
4.25 |
|
IK5147A/E |
4.25 |
1K5143A/B |
4.25 |
1N5167 |
5.50 |
|
1N5465 |
7.65 |
11^5711 |
1.00 |
1N5711 JAN |
2.00 |
|
L^5767 |
2.00 |
1116263 |
1.00 |
1S2199 |
15.00 |
|
1S2208/9 |
1,00 |
8B1087/48Ra69558 |
65.00 |
8D3020 |
65.00 |
|
BBIOSB |
1.00 |
BB105G |
1.00 |
F¥)4/4JFBD4 G.E. |
1.^,00 |
|
CMD514AB CM. |
pm |
M060 Alpha. |
ixm |
04159 Alpha |
J^XJR |
|
L>39(X> Alpha |
[\M |
rM959 Alpha |
TKM |
I>4987Sii Alplia |
POT |
|
D614VU Alpa |
POR |
D5503 Alpha |
iAM |
D6506 Alpha |
POR |
|
D(iiD6022 Alpha. |
V<M |
DftiD6460A Alpha. |
IJGR |
DF^0054 Crowq |
POl |
|
0Cl(if]2''89 GHZ |
31.35 |
GCI607^0 GH2 |
31.35 |
QC2531-88 Q{Z |
37.40 |
|
GC3208-40 (Ml |
37.40 |
GC17044 Om |
50.00 |
HP33644A-il01 |
125.00 |
|
HP5O82-0241 |
75. eo |
HP5OS3-0253 |
105.00 |
HP50S2-0320' |
58.00 |
|
HP50S2-03e6 |
K^ |
HP5Oft2-O401 |
POR |
HP.'t082-0438 |
POR |
|
HPS0g2-1332 |
POR |
Hl^O^-2254 |
POR |
HP5O82-2302 |
10.70 |
|
HP50e2-2696 |
POR |
i0>5O82-2711 |
23.15 |
HP5083-2727 |
rot |
|
Hf^S2-2305 |
4,45 |
[{r^062-2835 |
1.00 |
ifiP5082-2884 |
x'^Jlx |
|
IIP50S2-3040 |
36.00 |
I:EP5082-3080 |
2.00 |
HP50B2-31SS |
1.00 |
|
HP50S2-6459 |
POR |
I{P50S2-6'162 |
POR |
HP5082^588S |
IKH |
|
IiP5082-S323 |
P(M |
K3A IfemtPon |
7.00 |
^W^150A |
RHt |
|
MA40003 |
PtJt |
ilA41487 |
POR |
MA41765 |
IX3R |
|
MA43004 |
48.00 |
ttA435S9 |
PQB |
MA43622 |
POR |
|
MA45104 |
27.00 |
1^^47044 |
PCB |
^tA47051 |
25*50 |
|
m4T2ir> |
30.80 |
MA47771 |
POR |
^tA4733&* |
POR |
|
MA49106 |
37.95 |
MA49558 |
PCM |
Mj\8i-i731 |
125.00 |
+ OOK STOCK. DyUSGES DAILY SO CALL IF IF ItlL PAiW YDL' NEED IS NOT Llffl[>U ******♦********#»*****••********** **it*=***t
***+♦** 4
For information call: (602) 242-3037
Toll Free Number 800-528-0180
(for orders only)
"All parts may be new or surplus, and parts may be substituted with comparable parts if we are out of stock of an item."
Q^^l\z electroi||C$
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine • October, 1984 91
COAXIAL RELAY SWITCHES SPDT
Electronic Specialty Co* /Raven £lectro&ics Part f 25N28 Part # SU-01
26Vdc Type K CcFiioector, DC to L GHz.
FSN 59e5-356-9&e3
$49,00
NC
A
COM
;M S9S
>f#rcj
*!N 5-U lOI
^ A
Aspbdiol
Part i 316-10102-8
U5Vac Type BNC DC to 3 GHz,
S29-99
Part I 300-11182
l20Vac Type MC DC to 4 GHt-
FSN 5983-543-1225
$39.99
FSR
Fart # 300-11173 120V^c type fifiC Same FSN 5985- S43- 1850
BNC To Banana Plug Coax Cable RG-5S 36 inch or BNC to N Coa^s Cable RC^Sfi 36 Inch,
$7.99 or 2 Fqi- $13.99 or 10 For ?50.Q0
$8.99 or 2 For $15.99 or 10 For S60.00
SOLtP STATE RELAYS
P&B Model ECriDB72 PRICE EACH $5.00
Diglsig, Inc. Model ECS-215 PRICE EACH S7,50
Crigsby/Barton Model GB7400 PttlCE EACH S7.50
5vdc turn on
5vdc turn ofi
5vdc turn on
120vac contact dt Taisps or 20aBips on a
I0"x I0'*x . 124 aluminum, Heatsink wltli Billcoi] grease.
240viic contact I4a]i[ps or 40aiDps on a
10"jt 10"x .124 ali^inura. Heatsink with silicon grease.
240vac ccmtacc at 15aotps or 40aMps on a
IO"x 10"x . 124 aluminum. Hears ink with silicon grease.
HOTE; *** i
Bay be substituted with other brands or eqwivalcnt modea numbers. ***
gM^
For tntofmation call; (602) 242-3037
electroqici)
''Ail pans rnay be riew or surplus, and parts may be ^bstitui^ '«triirixornpar3t>le parts if we aie pul of slock of an itttfTL"
Toll FfM Numbtr 600-528 0180 (For ordirs only)
PRrCES SUBJECT TO CHANGE WITHOUT NOTICE
92 73 Magazine • CN:tober, 1984
RECALL PBONE MEMORY TELEPHONE tflTti 24 NUtfflER AUTO DIALER
The RecalL Phone Telephone employs the latest state of art C0nMiiilcatt<3ns technology. Ic is a combination telephone and automatic dialer thet usea preinLmtt-quallty, soiid- state circuitcy to assure bigh-rel lability performance In pergonal or business applicacions* 349.99
ARQN ALPHA RAPID BONDING GLUE
Super Glue lCE-4e6 high strength rapid bonding adhesive. Alpha Cyanoacry late. Set-Time 20 to 40 fiec . ,0. 7f 1. oz. (lOgm. )
$2.00
TOUCH *rOl^E PAD
This pad contains all the electronics to produce standard touch- tone tones. Hew with data.
MITSUMI UHF/VHF VARACTOR TUNER MODEL UVElA
Perfect for those unscrambler projects » £iew vlth data.
Si*? #
INTEGRATTD CIRCUIT
$9,99 or lO/$89.99
S19,99 or 10/5149.99
MCi372P
MC13S8P
NCi350P
MCL330AIP
MCi310P
MCi496P
LM565K
LMjaONU
LM1S89N
NE564N
hfE56lN
Color TV Video Modulator Circuit.
IF Amp. ,Ll!DiterpFK Detector , Audio Driver, Electronic Attenuator*
IF Amplifier
Low Level Video Detector
FH Stereo Demodulator
Balanced Modulator/Oemodulator
Phase Locked Loop
ZWatt Audio Power Amplifier
TV Video Modulator
Phase Locked Loop
Phase Locked Loop
|
1 to m |
Uup |
|
4.42 |
$2.95 |
|
5,00 |
4.00 |
|
1.50 |
1-25 |
|
KSO |
1.15 |
|
4.29 |
3.30 |
|
1.30 |
1.25 |
|
2,50 |
2.00 |
|
1.56 |
1.25 |
|
5.00 |
4.00 |
|
10*00 |
8.00 |
|
ID. 00 |
a, 00 |
FERRANTI ELEC-mONICS AM RADIO RECEIVER MODEL ZW414 IHTgGRATED CIRCUIT. Featiu'es:
1.2 to 1.6 volt operating range. ^Less than 0- 5iBa current consumption. 150KHz to 3MHz Frequency range. , Easy to assemble, no alignment necessary. Effective and variable AGC action., Will drive an earphone direct. Excelleit audio i^uallty* .Typical power gain of 72dB, ^10-18 package* With data, $2.99 or 10 For S24.99
HI CAD RECHARGEABLE BATTERIES
AA Battery Pack of 6 These are Factory New. S5. 00
StiB C Pack of 10 2,5Amp/Hr. SIO.OO
Gates Rechargeable Battery Packs
12vdc at 2,5Aiiip/Hr. llvdc at 5AiQp/Hr.
$11.99 $15,99
(fVI^^^ electroi|ic$
^"All parts may be new or surplus, and parts may be substituted with comparabre pans If we are out of stock of an item "
MOTOROLA MRF559 RF TRANSISTOR
hfe 30iiin 90typ 20CrTDx.
ft 30aQrhz
gain Set) min 9.5typ at 870itiz
13db typ at 312ntTZ output power .Swatts at 12.5v± at 87QTtiz.
$2.05 or 10/$I5.00
For information call: (602) 2423037
Toll Fr«e Number
800-528-0180 (For orders only)
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magszifie * October, 1384 93
"SOCKETS AND CHIMNEYS"
EIMAC TUBE SOCKETS AND CHIMNEYS
SKI 10
SK^OOA
SIC400
SK406
SK416
SK500
SK600
SK6Qa
SK606
SK607
SK610
SK620
SK626
5K636B
SK640
5K646
SK700
SK7nA
SK740
SK770
SK&OOA
SK806
SKSIO
SK900
SK90^
SKU20
SK1490
Socket
Sockec For 4CK5000A,R,J ^ 4CX10,OOOD» 4CX1S,000A,J
Socket For 4-l23A»250A,400A,400C,4PRl25A,400A,4-S00A, S-500A
Chimney For 4-250A.A00A,400C^4PR400A
Chimney For 3-400Z
Socket For 4-iOOOA/4PRl000A/&
Socket For 4CX230&,BC»FG»R,4CX3S0A,F,FJ
Socket For 4CX25OB,BC^FG,R,4CX350A,F,FJ
Chimney For 4CX250B,BC,FG,R,4CX3SaA,F\FJ
Socket For 4CX600J,JA
Socket For 4CX600J,JA
Socket For 4CX60Cy,JA
Chijfflijey For 4CS60OJ^JA
Socket For 4CX6O0J . JA
Oilmney For 4CX600J,JA
Socket For ACX600J,JA
Chimney For 4CX60aj,JA
Socket For 4CX3O0A, Y,4CX125C,F
Socket For 4CX300A,Y,4CX125C,F
Socket For 4CX3O0A,y ,4CX125C,F
Socket For 4CX3O0A,Y,4CX125C,F
Socket For 4CXl000A,4CXl 300B
Chiraney For 4CX1000A,4CX1500B
Socket For 4CX1000A,4CX1500B
Socket For 4X50OA
Chinmey For 4X500A
Socket For 5CX3000A
Socket For 4CV8O0OA
$POR
$520,00
260. 00
74.00
36*00
390*00
51-00
73.00
1 1 . 00
60.00
60*00
66.00
10.00
66 . 00
34.00
36.00
71.00
225,00
22 5,00
S6.00
86.00
225,00
40.00
225.00
300, 00
57.00
650.00
583.00
JOHNSON TUBE SOCKETS AND CHUfifEYS
124-1U/SK606
122-0275-001
124-0113-00
I24-n6/SK630A
124-I15-2/SK620A
Chimney For 4CX250B,BC,FG,R, 4CX350A.F.FJ
Socket For 3-5002, 4-125A, 250A, 400A, 4-500A, 5-50(kv
Capacitor Ring
Socket For 4CX2 50B,BC,FG pB, /4CX350A,F.FJ
Socket For 4CX250B,BC,FG,R, /4CX330A,F,FJ
813 Tube Socket
S 10*00 (pair) 15.00 15*00 55.00 55.00 20.00
CHIP CAPACITORS
*8pf
Ipf
l*lpf
L4pf
I.5pf
l*8pf
£*2pf
3.3pf 3.6pf 3.9pf 4.7pf 5,6pf
s.apf
8-2pf
PRICES:
1 to 10 - U to 50 ^ 51 to 100
lOpf 12pf 15pf 18pf 20pf Z2pf 24pf 27pf 33pf 39pf 47pf Slpf 55pf 68pf 82pf
*90e .80c
lOOpf*
nopf
l2Dpf
I30pf
I50pf
160pf
ISOpf
200pf
220pf*
240pf
270pf
300pf
330pf
360pf
390pf
|
TUBE CAPS (Plate) |
$11*00 |
|
HRl, 4 |
|
|
HR2,3» 6 & 7 |
13.00 |
|
HR5, 8 |
14*00 |
|
HR9 |
17,00 |
|
HRIO |
20.00 |
430pf
470pf
510pf
560pf
6£0pf
680pf
820pf
lOOOpf/.ODluf*
1800pf/,00iauf
270Qpf/.0027uf
10,D00pf/.01uf
lZ,000pf/.0l2yf
15»000pf/,015uf
18,000pf/.0i8uf
101 to 1000 1001 & UP
*60€ * IS A SPECIAL PRICE: ID for $7,50 .35« 100 for $65.00
1000 for $350.00
HATKINS JOHKSON WJ-V9Q7: Voltage Controlled Hicrowave Oscfl later
$110. 00
Fr^qyency range 3-6 to 4.2GH2, Power ouput, Min, IQdBm typical, SdBm Guaranteed, Spyrious output suppressiofi Harnionic (nfo). win. 20dB typical, In*8and Non-Harmonic a Biin, 60dB typical. Residual FM, pk to pk. Mast. SKHz, pyshing factor, Maj(. 8KHz/V. Pulling figure (1.5:1 VSWR), Hax* 6QHHz, Tuning voltage range +1 to +15volts, Tyning current. Max, -0.1mA, iBOdulation sensitivity range, Max, 120 to 30»lz/V, Input capacitance, Kax. lOOpf* Oscillator Bias *15 +*O.0S volts @ 55mA * Max*
Toll Free Number BOO-528-01 80 (For orders only)
"'All parts may be new or aurpiys, and parts may be sut)5tf luted with comparaCM^ parts If we are out of stocic of an Hem"
^/l^^J^x electroi|ics
For infofmatton call: (602) 242-3037 PRICES SUBJECT TO CHANGE WITHOUT NOTICE
04 73 Magazine • October, 1084
TYPE
PRICE
TYPE
PRICE
TYPE
PRICE
|
2C39/7289 |
S 34.00 |
1182/4600A |
S500.00 |
ML7815AL |
$ 60.00 |
|
2E26 |
7.95 |
4600A |
500.00 |
7843 |
107.00 |
|
2K28 |
200.00 |
4624 |
310.00 |
7854 |
130.00 |
|
3-5D0Z |
102.00 |
4657 |
84.00 |
ML7855KAL |
125.00 |
|
3-1000Z/8164 |
400.00 |
4662 |
100.00 |
7984 |
14.95 |
|
3B28/866A |
9.50 |
4665 |
500,00 |
8072 |
84.00 |
|
3CX400U7/8%1 |
255.00 |
4687 |
P.O.R. |
8106 |
5.00 |
|
3CX1000A7/a283 |
526.00 |
5675 |
42.00 |
8117A |
225.00 |
|
3CX3000F1/8239 |
567 . 00 |
5721 |
250.00 |
8121 |
110.00 |
|
3CW30000H7 |
1700.00 |
5768 |
125.00 |
8122 |
110.00 |
|
3X2500A3 |
473-00 |
5819 |
119.00 |
8134 |
470.00 |
|
3X30DOF1 |
557.00 |
5836 |
232.50 |
8155 |
12.00 |
|
4-65A/8165 |
69.00 |
5837 |
232.60 |
8233 |
60.00 |
|
4-125A/4D21 |
79.00 |
5861 |
140.00 |
8236 |
35.00 |
|
4-250A/5D22 |
98.00 |
5867A |
185.00 |
8295/PL172 |
500.00 |
|
4-400A/8438 |
98.00 |
5868/AX9902 |
270.00 |
8458 |
35.00 |
|
4-400B/7527 |
110.00 |
5876/A |
42.00 |
8462 |
130.00 |
|
4-400C/6775 |
110.00 |
5881/6L6 |
8.00 |
8505A |
95.00 |
|
4-1000A/8166 |
444 . 00 |
5893 |
60.00 |
8533W |
136.00 |
|
4CX250B/7203 |
54.00 |
5894 /A |
54.00 |
8560/A |
75.00 |
|
4a250FG/8621 |
75.00 |
5894B/8737 |
54.00 |
8560AS |
100.00 |
|
4CX250K/3245 |
125.00 |
5946 |
395.00 |
8608 |
38.00 |
|
4CX250R/7580W |
90.00 |
6083 /AZ 9 909 |
95.00 |
8624 |
100.00 |
|
4CX300A/8157 |
170.00 |
6146/5146A |
8.50 |
8637 |
70.00 |
|
4CH50A/8321 |
110.00 |
6146B/8298 |
10.50 |
8643 |
83.00 |
|
4CX350F/a322 |
115.00 |
6146W/7212 |
17.95 |
8647 |
158.00 |
|
4CX350FJ/8904 |
140.00 |
6156 |
110.00 |
8683 |
95.00 |
|
4CX600J/8809 |
835.00 |
6159 |
13.85 |
8877 |
465.00 |
|
4CX1000A/8i68 |
242.50* |
6159B |
23.50 |
8903 |
13.00 |
|
4CX1000A/8168 |
485.00 |
6161 |
325-00 |
8950 |
13.00 |
|
4CX1500B/8660 |
555.00 |
6280 |
42.50 |
8930 |
137.00 |
|
4CXS000A/8170 |
1100.00 |
6291 |
180.00 |
6L6 Metal |
25.00 |
|
4CX100000/8171 |
1255.00 |
6293 |
24.00 |
6L6GC |
6.03 |
|
4CX15000A/8281 |
1500.00 |
6326 |
P.O.R. |
6CA7/EL34 |
5.38 |
|
4CWe00F |
710.00 |
6360/A |
5.75 |
6CL6 |
3.50 |
|
4D32 |
240.00 |
6399 |
540.00 |
6DJ3 |
2.50 |
|
4E27A/5-125B |
240.00 |
6550A |
10.00 |
6DQ5 |
6.58 |
|
4 P R60A |
200.00 |
6883B/8032A/8552 |
10.00 |
6GF5 |
5.85 |
|
4PR60B |
345.00 |
6897 |
160.00 |
6G05A |
6.20 |
|
4PR65A/8ia7 |
175.00 |
6907 |
79.00 |
6GK6 |
5.00 |
|
4PR1000A/8189 |
590.00 |
6922/6DJ8 |
5.00 |
6HB5 |
6.00 |
|
4X150A/7034 |
60.00 |
6939 |
22.00 |
6HF5 |
8.73 |
|
4X150D/7509 |
95.00 |
7094 |
250.00 |
6JG6A |
6.28 |
|
4X250B |
45.00 |
7117 |
38.50 |
6JM6 |
6.00 |
|
4X250F |
45.00 |
7203 |
P.O.R. |
6JN6 |
6.00 |
|
4X500A |
412.00 |
7211 |
100.00 |
60S6C |
7,25 |
|
5CX1500A |
660.00 |
7213 |
300 . 00* |
6i(N6 |
5.05 |
|
KT88 |
27.50 |
7214 |
300.00* |
6KD6 |
8.26 |
|
416B |
45.00 |
7271 |
135.00 |
6LF6 |
7.00 |
|
416C |
62.50 |
7289/2C39 |
34.00 |
6106 G.E. |
7.00 |
|
572B/T160L |
49.95 |
7325 |
P.O.R. |
6LQ6/6MJ6 Sylvania |
9.00 |
|
592/3-200A3 |
211.00 |
7360 |
13.50 |
6ME6 |
8.90 |
|
807 |
8.50 |
7377 |
85.00 |
12AT7 |
3.50 |
|
SUA |
15,00 |
7408 |
2.50 |
12AX7 |
3.00 |
|
812A |
29.00 |
7609 |
95.00 |
12BY7 |
5.00 |
|
813 |
50.00 |
7735 |
36.00 |
12JB6A |
6.50 |
NOTE
= USED TUBE
NOTE P-O.R. = PRICE ON REQUEST
"ALl PARTS MAY BE NEW, USED, OR SURPLUS. PARTS MAY BE SUBSTITUTED WITH COMPARABLE PARTS IF WE ARE OUT OF STOCK OF AN ITEM.
NOTICE: ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE.
For Information call: (602) 242-3037
Toll Free Number 800-528-0180 (For orders only)
"All pans m»v be new or sufplite, «nd parls may be substityted with cofn parable parts tl we are out of Stock o* an item/'
(f\f *7[z electrof|ic$
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
73 Magazine * October, 1984 95
Cfi
99
FILTERS
COLLINS MecHonlcal Filter #525-972^-010 MODEL F455Z32F
455KHZ at 3,2kHz wide. May be other nx5dels but eqLiivalent. May be used or new, $15,99
ATLAS Crystal Filters
5,595-2,?/8/LSB, 5.595-2.7/I5B
B pole 2.7KHZ wide Ufpper sideband. Inpedence 8Q0ohms 15pf In/800ohms Opf out, 19,99
S, 595^2- 7/8/U, 5,595-2,7AJSB
8 pole 2-7Kh2 wide Upper sideband. Inpedence 900ohms 15pf In/800ohms Opf out* 19,99
5. 595". 500/4, 5. 595-. 500/4 /CW
4 pole 500 cycles wide CW. Ijnnpedaiice BOOohms 15pf In/SOOohms Opf out. 19,99
9 . OUSB/CW
6 pole 2.7KHZ wide at 6dB. Impedance 6B0ohms 7pf In/300ohms 8pf out, CW-1S99HZ 19.99
KOKUSAI ELECTRIC CO, HechgniCQl Filter #f1F-A55-ZL/ZU-21H
455KHZ at Center Preqaency of 453.5KC. Carrier Frequency of 455KBz 2,36KC Bandwidth, Upper sideband, (ZU) 19.99
Inwer sideband. fZL) 19,99
CRYSTAL FILTERS
NIKKO
TEW
SDK
TAMA
■TYCO/CD
FTI PTI PTI COTTEGH
FRC FILTE3CH
FX-07800C
FEC-103-2
SGH-113A
TF-3U^250
001019S80
4884863B01
5350C
5426C
1479
A10300
ERXP-15700
2131
7 . 3MM2 10.6935MHz
11.2735MH2
CF 3179 -3KHz
10, 7MHz 2pole ISKHz bandwidth
11.7MHz 2pole 15KHS bandwidth
12MHz 2pole 15KHz bandwidth
21.4MHz 2pole 15KH2 bandwidth
10.7Mflz 8pole bandwidth 7.5KHz at 3dB, 5KHz at 6dB
ASMHz 2pole 15KH2 bandwidth
20,6MHz 36MIZ wide
CF 7, 825MHz
$10.00
10,00
10,00
19,99
5,00
5.00
5.00
5.00
20*00
6.00
10,00
10,00
»41^^^H4^H;f^#«##44l#ftil#«4«4^'Ch«»4«ll#««»4««»4«##4«»»##'M^4«'J^fl^#««#-ft«»^#«#4»#ft«tti^
CERAMIC FILTERS
AXEL a^EVITE
INTIPPOW
TOKIN
4F449 TCHOIA
TCF4-12D36A
EFB455B
BFB455L
CFM455E
CFM455D
CrR455E
CFU455B
CFU455C
CFU455G
CFU455H
CFU455I
GFW455D
CTW455H
SFB455D
SFD455D
SFE10,7MA
SFElO,7MS
SFG10,7MA
LF-B4/CFU455I
LF-B6/CFU455H
IF-B8
IF-Cia
CF455A/BFU455K
12.6KC Bandpass Filter 3dB bandwidth l,6KHz from 11.8-13,4KHs
455KH24-2KH2 bandwidth 4-7% at 3dB
455KHz4-rKfIz bandwidth 6dB min 12KHz, 60dB ma^ 36VHz
455KHZ
455KHZ
455KH2 -1— 5.5KHZ at 3dB , 4-8KHz at 6dB , -»— 16K!!z at 50dB
455KH2 4-7KFTZ at 3dB , 4-lOKHz at 6dE , +-20KIZ at SOdB
455KH2 -I-5-5KH2 at 3dE , 4-8KHZ at 6dB , -f-16KHz at 60dB
455KIIZ H-2KHZ bandwidth -1-1 5KH2 at 6dB, +-30KHZ at 40dB
455KHZ +-2KHZ bandwidth ■+-12,5Kt{2 at 6dB , +-24KHZ at 40dB
455KIfz -I— iKHz bandwidtli 4-4,5KHz at 6dB
455KHZ +-1KH2 bandwidth -i-3KHz at 6dB ,
455KHZ ^IKlIz bandwidth ■i-2KHz at 6dB ,
455KKZ +-10KH2 at 6dB , -H20KHz at 40dB
455KHZ -h-3KHz at 6dB , +-9KHz at 40dB
455KH2
455KHZ +-2KHZ , 3dB bandwidth 4,5Kt!z 4- IKHz
10,7MFiz 280KH3 4-50KHZ at 3dB , 650KHz at 20dB
10,7MH2 230KH2 -f-50KHz at 3dB , 570KHZ at 20dB
10,7MHz
455KHZ -f-lKHz
455KH2 +-1KHZ
455KF1Z
455KHZ
455KI-iz +-2KI!z
f 4-lOKJiz at 40dB: +-gKHz at 40dB 4-6KHZ at 40dB
MATSUSHIRA EFC--L455K 455KHZ
10.00 5.00
10.00 2.50 3.50 6,65 6.65 8.00 2,90 2,90 2,90 2,90 2.90 2,90 2,90 2.50 5*00 2,50 2,50
10.00 2,90 2,90 2.90
10,00 5.00 7.00
SPECTRA PHYSICS INC. Model 088 HeNe LASER TUBES
BEAM DIA* ,75MM lOOOVDC -I—IOOVDC
ROTRON MUFFIN FANS Model MARK4/MU2A1
PQVER OUTPUT 1,6MW, 68K OHM IWATT BALLAST
BEAM DIR, 2,7^'[R
At 3,7^^
B¥^ STARTING VOLTAGE DC
$59,99
115 VAC 14WAITS
105CFM at 60CPS
50/60CPS
THESE ARE NEW
IMPEDENCE PRDTECIED-F
88CEM at 50CPS
(f\f ^^l|z electrof^cf
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
Toll Free Number 800-528-0180 (For orders only)
$ 7.99
''All parts may be new or surplus, and parts may be 5ubstitut^ wUh com parable parts if we are out of stock of an item "
For informatfon call: (602) 242-3037
96 73 Magazine * October, 1984
f
HEWLETT PACKARD SIGNAL GENERATORS
&06A
606B
608 C
&08D/ rS510
608E 603F
612A B14A
616A/ rS403
50KHZ to &5MHi In & iMnds+^U. Output level odjusto&le O.luv to 5V into 50 otiins, Built- In crystal calibrotOr.UOO -lOOOHz modulation.
Some OS i^t^ove but hos frequency contrut feoture to allow operation with HP 87 OS A Syncr^ronljer,
lOiflNr to ^80MH7^o-1ljV-IV Into 50 oriins.M.CW.or Pulse mo(3- ul-dtion, talibroted atteni^ator,
lOMHz to 420HHz/[J,iuV-0H5V Into 5Q [:hhms. + -0.5£ accuracy. t>ijj|t-in crystal calibrator^ AM-CVJ or pulse outuut,
[FiKproved verslOFi df DODulor 60SC.Up to IV tjuiput. Improved stability, low resiauol fm..
iOWHz to U55HH? In 5 bands +-i£ frecruency occurocy Nlth built-lo crystol colibraEor.Con be used with HP B708A Synchronizer. Output continuously odiustoble from ,luV to ,5V Into SO Ohms,
^5a-i230liHz .0.1uV-G.5V imp Sfl ohms, ca libra ted outpuLt
yoo-zlOOMHz With fiKiny featyres jnclutfJiia col sbroted outDut and all modulation charotteristlcs-
|
&1GE |
|
|
t 650,00 |
61SB |
|
$1100.00 |
&iac |
|
$ 500.00 |
620A |
|
$ 375.00 |
620B 626A |
|
$11+50.00 |
8708J |
|
JUDO. 00 |
|
|
1 ?5b.ob. |
i sno.GO
Direct reoding and direct cantrol from 1.8 to i^,?Mz, The H,P,616A features *-l,5dE calibrated output accuracy from -3l27dBm to -dEfii.The output Is directly calibrated In micrt)- voltJ ana dBm wicii .continyous itionitoring, Simple operation freCLfencv diod accuracy is +-1% and stobllity estceeas 0.005%- / C chonge in omtiient temperature, Catlhrotcd ottenuutor is within i--1.5aB over entire output band, 50 ohm impedance unit has Internal pulse inodulatlofl with rep rate variable from HU Hi to AKH;,vorlati]e puUewldthd to lOuseOond varioble oulse deloy(3 to SOOusec) .External modulating inouts irttreos ver- sotilltv, t 375,00
UHEX WBORATDRIES THS-2 Fl£XIOT HEADSCT,
these Jieoosets core with data to iiook ld lo a ICflM radios and QDnv other eouipntnt. Perfect far Ain>lcnes . i^Ucooters ^ MoDile Ridios . or just the Telepnone- These Are Foctorv ^Jevj in Sealed Bbxfes, Limited Simlv Only S69„95:
569.95
c5^^
48
ScBtie 05 above but later uradel.
S 60D.DO'
5.S to 7,&GH? range^wtth calibrated output and selection of Dblse-FM or square wove miodulotlQn. * bOCOQ'
Some as above but later inQdel.
7 to llGHz ronge.wjth collbroted output and selection ot py]se-FM or .'jai.jare wove moOu lotion.
:Si3ii^; OS DttOVe but later mtxjet
10 to 156H2a0niw output pulse-squore wave or FM
power with rnDduIatlctfi.
CQllbrateij output and
t2200.00
* 75,0.00, S22:QQ-00''
tit2nn.oo
Synchronizer used with 606B>60&F.Tne sviictironi^er is a phase- lock fretjiiency stabilizer wS^sch provides crystal - oscillator frequency stability to 43DnHj in the 6&SF signal generator .Phase Idcliing E]imlnote& microphonics and drift resulting In excellent frequency stabillty.Tbc S7DSA incluaes a vernier wbich can tune the reference Oscillator over a range of +-0,25S permittirtg frequency settobility to 2 oarts in ID to tbe sever+th.Pfovutes a very stable signal that satisfies- (Fiony. .erttlcat opplscotiaris,
(With HP 6fl6E or fi08F) J 350.00
(Without) ^ 450. 00^
fflC-10 NF'IOSF
12500, ():&:
12100 <0Q;
ELECIRQflETRICS EMC-lD RFl/Eill RECEIVER
LOW frequency analyzer covering 20H^ to 50KH7 freauency
range, Extendable to 500 'k^hz ir^ wideoond nioae^
EntPire Devices Fiela Intensity Meter.
Has NF- lOS/TA. ftlF-i05/TX. NF -10!^/ f 1 .NF-105/ir2, f^F- 105/T? .
Covers WKhZ to lOOOMH;.
ALL LQUtPrtENT CflRRV A 30 DAY i^UAftANTEE,
EOOIPMEMT IS NOT CALIBRATED,
TERMS: DOMESTIC: PfftflSrfl, CO-D. W CfgiJil Card
f Ofleit^N; P*'4j3Sirt (Jflily, U.S. Fun*s. Mflney Ottlm. or taahierg Criecfc Only,
CO.D." Acceptable by ter«phanB of mstl. PByment Frofn cuslomer will be bfy OBShi, Munfly Order, or Caat^iw's Ct^ck W« an SOrry tHit we cannot acN^pl pecsonal chactia lor CO.D.'s. CO. P. 'a sre ah>lppEid by aif only and niru United Parcel ServicB.
C:OStFIFthirN^ OI^PtFIS: W^ v/cm\if fifvstst ihai cani\nn\rM cKders nni be s^ni arte^T a E&1eptTone f>rdQr has basf^ i^laiced. ir GDmpany policy ni^i^^^jtatB^ a fjocillimlnQ order, ^leag,« mark '"CONFirihtlNO" boLdlyon the order tf pfoblems or duplicate shiipf^nCS cc- tma due tp an ottiM A-hlcti la not prapefly manned, ttie custcxTi&r will be held regponsiibie fcir any ctiargss Incurred, p^us a tbVt (eDtcick -^rn^i-ge on the nfy|uri!>^ p^Mi.
CneoiT CAIRQ& We ^re no^ moBpUrvi MaSTEJICaF^O, VISA, AnQ AMERICAN EXPRESS
DATA SHEETS,: Wn«n hvb luue date Bheals ^n slock on devicea we will supply them with the CKder
DEFECTIVl MATERIALS; All claims to d«l«;tive materials fnwit t* mada Wfthin 30 OAVg Bftor r&teipt of Ihe parcel. All ctainva mu5] intkrcto the dalectivo mafarifti (f^jr Iwiling pwrptMftii), A CiypY cF <ju' :ni*it*, SnJ ii I'ftlui'n ^mTiOr'JJ'i-l'iOi^ numEiar (prhcch mus( be obtained prior to stripping I he Witjrchifndtso bsck m ut. This tan be obiaiood iJt -talltno (602J ?4J^FIlEi or ge«dlnfl u^ e poalcard. Oue (6 Manutaclurer warranti-es we sie unebie to fapl^ciS Or issue ttedJI on items which hin^e Nw sol^Jared 1o ar haine lieen aJtWBd in ari^ way, AH return itofTis must be paChotl prtiUefly or ii wMI viM M witmiWtyi We cJo nrj! aesuma ffispctsslbJtlt^ for ship- ^n^ atid hBrKJNng c^li^rgsti incurred
PELfVERY; OfdarS Are usually ifihippmf Ih* MiTia (Qy thSV *r« p^sCijil Of Ihfr n^sitl' hu^lrtfiijis; (JAy, ynleae we are out of atacfc on aa ilom. T^^J tustofiwr will be nOdifiEO by [)OSI C&fd if ** *re goififl Lo imckOftJer th* itom Ot^ir ncwmal shipping methsrf is UPS or Ll.a l^^it ^kip^jridirrg n^n :$4ri^ of ih>J weiphi c^r ih^ p^^Jt^g^ T^H ^quipniAnl Is ship^^ied ofiif/ by all ard Ib rnstght coNecl, u^iees pfjcU ?jr0r>geh'*Dnt5 have been maute <'inrl approvi^d
FOAeigh dHDEH^ All EDteitjn orders mu^t be prepai-d wJlh a CaahLer'a Clwck, or Money Ordler madle out iti U.5, RUMOS ONLY W$ arQ eorry t^ui C.Q.D. h i^i av^itable lo rofelgn ceHjntfles and leltere pt crsdyi are unaccepHable es e term of paymenl. Fuilher infotmfltiijri is av9M*Dr« on rftfl«»e&L.
HQUHS: Monday thru Fri^jaV S:30 l.n^. 10 ^^ p.m. :&ati,[Tday$ S:3d e.m to 4^ p.m..
tNSUnANCE,- PJease mclurie 25* fdr ejKh additional J 100.00 o«bt tlOO.OO. UPS OIMLY- Alfc irtSured 0*CHsg(« are sJilpped thru UPS [}n[y. i1 yD4i wish Id hava it ahipped th^ouj^ the post atUca [h6r« Is a E5.0O fe«i> wl^ich rS jHMi|iO«4i li^ llv« jei||jp|/ia, handling end 'n- suFanoe.
OPEN ACCOUNTS: We regrel lhe( we do not laauB open aooourrts.
ORDER FORMS: IVew cfder Jorma are Included with each rifder tor your cortveni-enoe. Additiorral Order rerOtS- At^- evall£til« on rBquest.
PARTS: We reserve trie right to iubstlture or reprice ajiy Etem wHh a pan ot equal or comparable sp&cJficaLiDn,
POSTAGE: M^nimjm shipping and handling in Ihe L/.S.. Canorfa, and MeKiti;jiS $3,00 fot'3r'OlJnctsh^p- nn^nts, all othet coui^tries is S5,50. Air ral-s^ ar$ ava^l^taie at tha time ot your order. Afl toreign orders please include 3&'^<i of rha ordarsd amount tor shipping and handling. C.O.D.'s ane shipped AtR ONLY.
PREPAID ORDERS: Orders must be accompanied by a check,
PRICES: Prices are Subject to change wilhoul oolice.
PURCHASE ORDERS; We accept purcrrase orijer^ only whon th^/ ara accoHmpanied by a check,
RESTOCK CHAHQES: ff parts ara raturned to MHZ ELECTRONICS, INC. due to customeT error, the
custoinef will be held responsible foe all fees incurred and will b# charged a 15% RESTOCK Charge with the remainder in CREDIT ONLY. The follow I rig must accompar^y any return: A copy ot our invoice, return authorization number which musl be obtained prior to sUppping the fnercliiandise back, Returr^s tnu&l be done wHhin 10 DAYS of recatpt of parcel. Rflturn authorization numbers can be obtained by calling {602} 242-6916 or notifying uS by (MSl card. Relurn aiilhorliationa will not be qiven out on our 80C" number.
SALES TAX: ARIZONA residents must add 6% safes tfijc. unless a signed ARIZONA resale Tax card is cut rendy on (iEe with us. All orders placed by persons outside of Afli3Z0NA, but delivered to per- sons in AHI20N,A are subject lo the 6"-'o sales tax.
SHORTAGE OR DAMAGE: All ciaJms for shortages or damages musl be made within 5 DAYS of receipt of parcel. Claims musl fnclude a copy of our Invoicen aEong wUh a return authorization number which can be obtained by contacting us at (602) 242-8916 or sending a po&t card. Aulhoriza- tJons cannot ba on ogr SOO number. Ail itama musl l>e property packed. If itefns are not. properly packed maFte sure to contact the carrl:er so that they can come out and i^nspact the package before it is returned to us. Customers which do nol notify us *llhin this lime period will be: held responsible for the entire order as we will consider the order compiets.
OUR 600 NUMBER i5 STRICTLY FOR ORDERS ONLY (SOO) 52S>OieO. INFOHMATION CALLS ARE TA KEN ON {602} 242-89 1 6 or (602) 242-3037 ,
maslHT cllArg^
I
elect ^of^CJ|^
2111 W. CAMELBACK ROAD PHOENIX, ARIZONA 85015
"All parts may be new or
surplus^ and parts may be substitutGd wflti comparable parts If we are out of slock ot an item."
Toll Fr99 Numbftr 6O0-52a'018O (For orders only)
For information call: (602) 242 3037
PRICES SUBJECT TO CHANGE WITHOUT NOTICE
I
p
^ See List of Advertisers on page 98
73 Magazine • October, 1984 97
mm
ADVERTISERS
'Please contact these advertisers directly.
To receive full information from our advert is^ ers please complete the postage-paid card.
R. S. No.
Page R. S. No.
Page R.S. No.
Page R. S. No.
* AEA/Advanced Electronic Applications 16J7, 65, B2J09
297 A.G.W. Enterprises, Inc 46
20 AH Eisctranics .27
* Amateuf Communications, Etc.
19
Amateur Electronic Supply .23,63
334 Am idon Associates 107
71 Applied Invention 107
293 Arcomrri . . .,,,.,...* 14
266 Azimuth Communications Corp.
79
Barker &Wi I i lamson., 64,64
305 Barry Electronics .3!
1 52 Bencher, Inc. . . * 19
477 ailal Company .83
295 filial Company 86
Btll Ashby&Son . . . .107
^ Butternut EtectmnJcs. . .50
462 CESJnc 114
290 CMC Communications, Inc. .... .67
1 1 1 CeCo Communications , . ,105
267 Colico Elect. p Inc , . , 61
301 Com-Rad Industries .61
1 4 Com m u n Icat ions Concepts, Inc.
296 Communications Electronics . ..13
15 Communications Specialists Jnc.
■ ■■■ ■IK.H,J|^.«.HB. MB.BBB.BJ Bd BB BB KB B O y £7
280 Computer frsder 1 03
* Connect Systems, Inc .57
2& Control Products Unftd SO
* Crumtronics 71
* dataLOG 71
346 DataServ^ce 99
425 Dcppler Systems . , .24
* EGE 36
400 Engineering Consutting ...... ..5Q
99 Faxscan .4
304 Fox-Tango Corporation . . , 73
139 Fox -Tango Corporation 109
269 GIB Electronics 105
281 Glen Martin Engineering , 107
352 Grove Enterprises 103
167 1-1. Stewart Designs ..86
31 HaJ-Tronjx .64
271 Ham MasterTapes 35
Ham RadioOutlet .3
465 Hamtronics, NY 100
266 Hamtronics, NY 110
33 Hamtronics, NY 111
Horizon Printing Co 99
123 Hustler, Inc.. ., 4
291 Hustier,lnc,. ,.107
274 ICOM ..Cov.il
486 ICOM ..,^^,. . . 101
J. L Industries .87
481 J, L Industries 100
KLM Electronics . . 105
165 K & S Enterprises . . , 69
* Kantronlcs 47
Kenwood .T.CovJV
462 Larsen Antennas 100
322 larsen Antennas . , . * ....... 37
9 ^rj Enterprises ....,, .52, 53
46 MHz Etectronlcs 68-97
45 MadFson Electronics Supply 41
54 Magnum Distributors, Inc. ....... IS
49 Micro Control Specialties 61
51 MIcrolog Corp 43
Mirage Communications 42
254 National Cocnm. Group . ....24
412 Nemal Electronics 79
137 NiJi&&Von& 71
0/^jf h^agazine ... 78
P. C, Electronics .64
4 Parsec Communications ... 108
306 Phlladelpliia Resins Corp. 19
146 Public Domain 24
277 RF Products .... 101
61 Radio Amateur Ca/^boofr, inc. ... 109 454 Radlokit 69
BOOKS, etc.
AMATEUR RADIO/ELECTRONICS TITLES
MICROCOMPUTER TITLES
Catalog n
BK7307 CT7305 CT7306 CT7313 CT732D Cn325 CT7304 Bi<:730S BK7321 BK7322 BK7393 BK7312 BK7340 BK7383
BK731Q
BK7302
BK7351
BK736e
SG7357
307358
CT73CX)
LB7360
LB7361
LB7362
LB7365
6K7315
item Behind the Dial
5 WPM Code Tape
6 + WPM Code Tape 13+ WPM Code Tape 20+ WPM Code Tape 25 + WPM Code Tape Code Tapes {any four abova) Contest Cooktxwk
A Guide to Ham Radio Hobby Computers Are Heie Living on a Shoestring The Magic of Ham Radio The New Hobby Computers The New Weather Satellite Handbook
Owner Repair of Radio Equipment Propagation Wizard's Handbook SSB. . .The Misunderstood Mode VHP Antenna Handbook Study Guide-Novice Class Study Guide^enerai Class Novice Study Tapes {Set of 3) Test Equip. Lib. V2— Audio Tester Test Equip. Lib. V3— Radio Equip. Test Equip. Lib. V4— IC Test Equip. Test Equip. Lib. VO— Vols. 2. 3, & 4 World Re|:^eater Atlas
Page
268 Ramsey Eleclronics 113
* Hoensch Iwticrowave 101
500 73
Bac¥, tssyes , , , .69
Dealer Ad ,.,..*.. 109
Maiilr^g List B7
Moving ..... ........... .78, 37
Subscriptions ...... .18,51,99
6S S-F Amateur Radio Sales .,.. ... - 87 68 Spectru m Communications . „ . . , 69
436 Spectrum International ,46
Spider Antenna ,24
TheHam Shack . . 45
104 Trlonyx, Inc. . , 23
203 Unicom Electronics . . . .25
300 Unidan Bearcat 5
149 UniqufeComm. Cofp^ »..,.. ^ 99
179 Universal Electronics 49
* University Microfilms ,,.,....... 99
*• Vid-Com..... 71
" W.H. Nail Company .99
" W9rNN Antennas .71
|
79 |
Wacom Products .50 |
|
80 |
Western Radio Electronics 99 |
|
t: |
Wheeler Applied Research Lab |
|
99 |
|
|
m |
Williams Radio Sales 99 |
|
83 |
Yaesu Electronics Gov. Ill |
|
PrtM |
Catalog # |
Jt&fn |
Price |
|
$ 4.95 |
BK73S4 |
Annotated BASIC Vol. t |
10.95 |
|
4.96 |
BK73S5 |
Annotated BASIC Vol. 2 |
10.95 |
|
4.95 |
BK7390 |
Inside Your Computer |
12.97 |
|
4.95 |
BK7398 |
Introduction to THS-80 Data Files |
24.97 |
|
4.95 |
BK7386 |
Kilobaud Klassroom |
14.95 |
|
4.95 |
BK7404 |
Mach. i^ng. Subroutines ^or CoCo |
29.97 |
|
15.95 |
BK7400 |
Prog, fof Electronic Circuit Design |
14.95 |
|
5^ |
CC74001 1 |
BK7400 with Apple disk |
24.97 |
|
4,95 |
CC740012 |
BK7400 with IBM PC disk |
24.97 |
|
2.49 |
CC740013 |
BK7400 with TRS-80 disk |
24.97 |
|
7.97 |
BK738a |
The Select ric^M interface |
12.97 |
|
4.95 |
BK731 1 |
Some of the Best from Kilobaud |
10.95 |
|
2.49 |
BK7394 |
TRS^ as a Controller |
12.97 |
|
8,95 |
BK7395 |
TRS-80/Z30 Assembly Ung, Library |
34.97 |
|
BK7382 |
Understanding & Prog. |
10,95 |
|
|
7,95 |
Microcomputers |
||
|
6,95 |
|||
|
5,50 |
SHELF BOXES |
||
|
5.95 4.96 |
Catalog § |
Ifoin |
Price |
|
BX1000 |
Shelf box— 1 |
2,00 |
|
|
6.95 |
BX1001 |
Shelf boxes— 2-7 |
1 .50 ea. |
|
15.95 1.95 |
BX1002 |
Shelf txjxes- 8 and up |
1.25 ea. |
|
1.95 |
|||
|
1.95 |
|||
|
4.96 |
|||
|
2.00 |
To Order
SHIPPING AMD HAN- DLING: $1,50 for the first book. $1.00 for each addi- tional book for US delivery and foreign surface, $10.00 per book for for- eign airmail. Orders pay- able in US dollars only.
Complete the postage paid card, or itemize your order with payment or complete credit card In- formation (Include post- age and handling) to: WG Books, ATTN. Retail Sales, Rte. 101 and Elm St., PetertMTOugh, NH 03458.
98 73 Magazine • October, 1984
ALL BAND TRAP ANTENNAS !| SANTEC handhelds
xj-<tnMfr-
PRETUNED- COMPLET- ELY ASSEMBLED 'ONLY one NEAT SMALL AN- TENNA FOR ALL BANDS! EXCELLENT rOft CON- DO'S - APARTMENTS - LIGHT - STHONa - ALMOST IN VI SIB LEI
FOR ALL MAKES 4k MODELS OF AMATEUR TRANSCEIVERS J GUAR- ANTEEO FOR 2006 WATTS SSa INPUT FOR NOVICE AND ALL CLASS AMATEURS^ IMPROVED DESIGN I
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73 Magazine * October, 1984 99
A/EIV PRODUCTS
LARSEN NMO ANTENNAS, PaK MOUNTING KITS
The L2r&«n PQ-K rrKHtntlng kit features SO-239-9tyl« mounting har<iware that can be ir^talled entirety from outside the vetih cle- The PO Sfties mount looks like the 80-239 cofir>ectof {3ometliT^«$ catle^ a f«- male UHF conr^ector). but untike the S0239, It can be installed Irofn outside the vehicle- Its two O rings and wm gasket offer super moiaiuf« $«allng.
Larsen^s PO-K ificlude$ complete mounting lut arid coax: the POB contains mounting hardware only.
Larsen NMO series aniennos offer iiTh proved weather prelection. Jtm improved NMO co^i features an extra Up around the botiom, providing a place for an O ring. The rirtg surrounds itie threads itiai tight* en to lh«e vehicle surface, ellfninat^ng the charges thai water rrvay t>e drawn through the threads arKi decrease performance or corrode mounting hardware.
All NMQ series VHF and UHF products nom incJude this €har%ge. LM and NLA se- ries are equipped wHh a neoprene gasket
Larsmt NMO anSennA base and weather ssaling O rmg.
arourtd mounting hardware fof a weather- tight seal.
For more intormatiOf>, cof^tact Lerse/7 Btectfonics, PO Box 1799, Vancouver WA 9dMS: (2Q6h573-2722. Reader Service numtief 4B2-
A Lsrs&n NMO antenna.
ANTUNER AND HAM-ANTUNER
J. L Industries has introduced An tuner, an automatic antenna tuner with no mov- ing parts. Antuner covers a wide spectrum of frequencies from .1 MHz to 100 MHz. An
Jf>§ BtKM Jtck porfsble mo(tiilsNei0pfione isck ^ftaoAmefif for ctfmpat^ ff/ecommuni- Ctff/ons.
The Tratfsi-Trap surge prot&ctor from CutMWAy cf larsen PO-K ant&nna mount. Atpha O^fta Communications, Inc.
100 73 Magazine * October, 1984
antenna system with Anturket in which 50 feet of wire ts attached to fhe hot ervl of ttie unit and a minfmum of 25 feet is at- tached to 11^ ground siOe of the unit will produce an swr of no higtver ttian 1j5 to 1. For frequencies attove 12 MHXt it rareJy eat- ceeds r2 lo l.
To achieve these resuils, Antuner incor- porates the use of sophisticated circuitry for tuning as well as inpyt*impedance star Ulizatlon. Ail this Is accomplished t>y the use of a three^pon circulator. The system ts phased so that there is minimal attenu- ation In ttie feed tfirection and a much greater atienuaiion in the reverse dlrec- lion. Currents in itie feed direction induce currents in the windings thai are in phase, wNle cuf rents in the reverse direction \n- duce currents that are out of please. A widel>and jnstanianeous antenna tuner without moving parts is the result. Com- pletely passive, it Is an efficient coupling system for an asymmetrical dipole anten- na. If desired, a long wire coutd he con- nected to the hoi end of Aniuner and a good ground to the ground side of Antun- er'. Antuner can be usod for marine instal latlcn^ (salltToals and c^ommerdal ships), oil rigs, ham radio for airplanes, and tor special situations in which uriobtrusfve horizontal antennas are needed.
The Antuner can handle 1D00 Watts PEP. A 300 Wall version, called the Ham- Ant uner, is also available.
For more information, contact J. L //^ tfwsff/es. PO Box 547. HaffanUale FL 33009: 0O5}-4586O94. Reader Service number 481.
SURGE PROTECTOR FROM ALPHA DELTA
The new Alpha Delta CommunlGations, Irfec , Model ACTT ac Trans i-Trap^"^ is a direct ptug-irvthe-wajl ac surge protector which includes two 120'V-ac sockets, sta^ lus lighK circuit breaker, and a unique 3- Stage automatic surge-protection clrcuiL
Tlw Model ACTT ptovides both trans- verse- and common-mode protoctton with ft hot-tofieutral. neutralto-ground, ar»d hot- tOijiound eOOO-volt, 2000 Amp surge dis- charge seitrestorir^ hlgh^pMd circuit. [Several typical competitive devices use only a sirtgle-stage. 100- Amp protector.)
TT»e conliguraiioo of ttve Model ACTT also protects equipment plugged tnio any otr^ef cominorvbranch ac wall outlet down line from tt*e ACTT,
Ibe unit is UL listed and is available at Alpha Detta dealers or tflrect tram ttie manufacturer.
For more ctetalls. contact Afpha Dsfta Cammunicaiiofts, Iftc.^ PO Box S?^, Cen- tervm OH 454^9; (SJ3H3^T?Z Reader Service number 47^.
PORTABLE MODULAR
JACK FOR MODEMS
The Mioroperiptreral Corporation has anc^unced a r^ew portable rtioduUir4ele~ phorie jach attachmeitt for computer tele- communications. The product is mar* keted under the trade name Black
The Black Jack solves telephone ami computer Interface problems encoun- tefed tiy growing numt>ers of portabfe- computer owners and dtrect^connect mo- dem users. Most hotels, offices, and other locations from which computerized tele- communications are desirable and neces- sary do not have modular {BJ11C) (acks. Unless special equipment is installed or the butlty old-fashioned carbon acoustical coupler cups are used, telecommun tea* tions are not an option from many lo* cations.
The Black Jack is constructed ol rubber with a built-in circuit card and modular jack. Its unfque connectors make it com- pat ithte with sinsle-or multi-line telephone handsets such as I hose manufactured by Sell, ITT, and GTE. The unit requires no power. Modems equipped with touch* tone^'^ dialing may dial directly through the Biack Jack Pulse dialing is accom- plished on the telephone Set Itself.
In addition to solving the problems associated with hard-wired telephorves lacking modular jacks, the Black Jack eliminates the loss of line sensitivity as- sociated with the use of acoustical cou^ piers. The new direct-con nect modems result in sensitivity gains of approximate- ty 20 dB Qvef the otd-tashioned acoustical couplings. The Black Jack lets the modem user keep these iine-sensHIvily gains white improving telecommunications per- form aj^cei
For additional informal ion. contact The MieToperiptierat Cotporatioa^ 2SK f52/icf Avenue ATE ReitmomS WA 9eOS2; (20^ S8t-7544. Router Service numbef 4d3.
HAMTRONICS OUTDOOR
SCANNER ANTENNA
Hamtronics. Inc., a manufacturer of tow-r>Qdse receiving etfuipment lor an^a- teur raftio, has anrwunced a new antefina for scanner and monitor buffs to serve a need for a scanner antenna which is halt< way between a buitt-in whip on a scanrher and a large oulffoor ant^tna fequiring roof mounting wtlh some son ol mast »- rang^iient Hamtronics h^i dWMQnad a compact 'Power Antenna" which may txi Instalied easily on the side of a house, outside a window, in an at1rc» etc-^ without any special mast o<r brackets.
Casficrafrs new amateur sat»ifite antenna system.
The ACT-1 Powef Aniefin^ ts a broad-
anipl^rier in its iia$«. AlthcHjgfi much umaUet than a full size otitdoof anienna (25 inches tall), it prg>yides good coverage of distant signals and js capable ol out- performing larger antennas because of Ihe active booster amplifier. The built-in preamp has a gain of up to IS dB,
A kMHioise microwave transistof in the pceamp cover$ ffom 30 MHz througli ttve new 800-MHz bafid. and it covets low- band^ higivband, and UHF, M is a good oiiTdoor antenna for The 800^ Hz band. The probi^em of large Fosses in> ihe coax cable is solved by the amplifying of the weak aignat from the antenna before the coax cabte run can degrade ^1. There 1$ a benefit from this effect even on UHF and VHP reception. In this regard, the ACT-1 ca^n outpeiforrri ant outd^oor antenna w^ith a separate pfeamp at the radio^
The simile installation required for an ACT-1 antenna and ttie fact that It is shipp^ fully assembled make it easy to impfove on the performance of radio-mounted whips. Four wood screws mount it to any flat vertical surface. The 5Q-foat cabEe plugs directly Into the "antenna" and ''12V" facks on the rear of most scanner radiCA, If your partkytar scannef doesn't have a 12-V terminer, a srmpje 12-V-clc plug-In adaptef i$ available,
Fof mofe information, contact Ham- ffonics. Inc.. ^~f Mout Road. Hitton NY J44m9535; (716^392-9430. A complete catalog is also available for pufchaae. fleader Service number 405.
CUSHCRAFT SATELLITE ANTEKNA SYSTEM
Cushcraft has introduced a new com- plete amateur satelHle antenna system featuring two nigh-galn, circularly-polar- ized yagi an ten n as. The 70-cm, 1&elamen.t uplink and 2^neter, 20-element downlink antennas are fixed to a common mounting boom. The entire array is lightweight with reasonable dirr^ension^ lor quick inslal- lat^oa
For more information, contact Ciisfh Cfaff Corporation, PQ Box 4680, Manches- ter NH 03706: m3}^7 7$77; t^tex 953^?5^ Cvsfisig Man. Reader Service numt>er 480.
The' fC-27H 2-meter mobfte transceiver from Icom.
* — ^'' — * ■ ^ ' ^
An antenna tower constructed with FfsmsMaker damps.
BUrLD YOUR OWN TOWER
WITH FRAMEMAKER CLAMPS
Build a sturdy, pfofessionat-loohtng tower for a TV. CB, of hanvfadio antenna out of aTmmon 3/4-inch electrical conduit and plated-steef FrameMakef Clamps.
The only tools needed are a hacksaw (or tube culterj to cut the conduit and a cou- pie of wrenches. Conduit sections are simply placed into the openings of the clamps, and the plated nuts and bolts are lightened, loc^ir^ the ctamp jaws secure^ ly a/ound the condi/ilr
To «votd the pitfaiis of "on&ciamp- doesalt" designs, s^eral kirhds of Frame- Maker clamps are mad^^: 4 way fixed and adjustable. 3-way T, 2 way adjustable, and paralleL No locking collars or sat screws are needed to prevent slippage. Unlike towers whose lolnts are welded or brazed, a tower made wJth FrameMaker clamps can easily be taken down, and the clamps ar^I conduit can be used to bulJid any num- bcf of other projects.
Frem protect idea brochure is available from B<iy/seye Products, Dopi DY. 2BS06 Hayes. Ros&vftte Mi 48066. Reader Service number 479.
IC-27H
Icom has introduced another in its line of ultra-compact mot>iles: the IC-27ti 45-Wa|1, 2-rneter rr>ob4ie transceivet.
Standard features include compact si]» (1-5/8 H X 5-t/2^"W K ^^fS'Dl butlt- in Interr^t speaker for easy mount i^ng^ nine full function memories, S2 buitt-ln PL^M frequencies, iC-HM23 DTWF micro- phone with up,/down scan buttons^ three
scannir^ (unctions (mennofy scan, band scan, ar^ prFOrity sf^ani internal lithium- battery menriory t>acltgp to maintain mefn- orres tor up to Trve years, and the IC-I4B27 niobile mount.
A variety of options are also available, including an IC-UTie speech syntheS'l^er and IC SP4 and SP5 external speakers.
For more Informal Ion, contact icom America, inc^, 2712 ri6th Ave. NE. Betie- vue WA 96004. Reader Sen^ice numtief 486.
ANTENNA DESIGN SOFTWARE
Smith Software Systems has released their fatest haiivf elated software pacMage for the Apple Jl-i- ar>d lie computers. Arv tenna Design Software ^s a meniKlrLven program composed ot twenty-sEx submod- ules to help m the design of HFA^HF/UHF antennas and transmission lines.
CapaJt^ilities include design of antenna types such as dipote. folded dipole. verth cat, long wire. 2- and 3-elflfneni quad, para- bolic dish, and loop. Help is atso provided with calculaling feed line losses, phasing lin^. transmissiorvlir^e traris formers, and swr. There are also several related topics such as propagation and component design.
The package was developed with the newcomer to ham radio and computers In mind, but it w^ if be an eKcellent asset to the expert in helping with long and tadi* ous calculations. The package inclu^fes a diskette (not copy protected) and an ex- tensive user's manuat.
For additionai infofmatton, contact Smitfr SoftwarB Systems. 3767 Go/d Spffng Creanjery Road. Doytestown PA 1S9Qt. Reader Service number 4Q4.
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fot HI owners operating mside a vehicle and wantir^g incfeased T/R fange, RF PRODUCTS has the low cost solution.
Remove your BNC antenna from Ihe NT ar\d mount or> the RF PRODUCTS BNC magnet mount, mstail the magnet mount on the roof lop and connect the BNC co^ax connector,
The magnet mount (part no 199-445^ has 10 feet of small (5/32*) CO ax with BNC connector attached and is priced at $15 95 {including shipping by UPS to 48 states) TO ORDER - send SI 5.95 money order or cashiers checit only
Fla. residents add 5% tax, for air UPS add SI. 50
The F^ PROD UCT S M a gn el Mou nts are one ot the few m a gnet ic an tenna mou nts a vai lab Ie that can be r epai red should ( he co-ax cable be damaged. T1^ ca-ax cat^ connector mci udes a shrink tubing strain relief for long life at the con nee tor /'ca We Sex point (an RF PRODUCTS e^tdusive on all cal>ie assemblies^
Eight ot he r mode Is a va i labie with three each choice of a rrtenna co n n ec lOfs, co-a x types an d transceiver connectors (BNG, 1-1/8-18, 5/16-24 & RG-122U, HG-bSAlU, mini 6X & BNC, PL-259, type N).
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^ S«« List of Adyeriisers on page 98
73 Magazine • October, 1984 101
comm
Robert Baker WB2GFE t5 Windsor Or. Atco NJ 08004
COLUMBUS DAY
IffTERNATIONAL DX CONTEST
Starts: 1200 GMT October 13
Ends: 2400 GMT October 14
THe f ifat DX contast In cofnmomoralion oi ColirmtKJS Day mHI be sponsored by ttte Mtanii Havana Uori:9 Club. The official contest opefatoce will l<tontlfy thefn&etv«9 with Itwlr OR'^, call sign, and with the^f of^ Mai number as coniest opefatora, Sufh gnted frequencies wJll be US amamur teflds In 10, 15, 20. 40. a^id 80 metera, phone and CW.
An amateur station making Mva coo ttcts with otflcial radlociub DX moinA^ef OpWHtOft during ihe two days will be ellgl^ bie to apply for the Miami Havana Lions Club OSL Award. Contacts with olficial operalQfs must be made during (tie con- test period, exchanglrig RSfT) and QTH. Enf^ish, Spanish, and Portuguese lan- guages will be used.
SWLa may also appjy for Ihts award on a tieard basis. Send OSLs or log along with SEOO In US funds or 6 IRCs for mi a apeqlal award to: Miami Havana Uon$ Ciub. Columbus Day Internalional OX Contest. Bo3c 674, Miami FL 33155.
At the start of the contest, memlwrs of the contest committee will read the n«nie« and assigned numbers of the offi- cial operators on the followinQ trequan- cles; ?230, 14250. 21250. and 28915.
RIO CW OX PARTY
Starts: 1500 GMT October 13
Ends: 1500 GMT October 14
Sponsored by the Plca-Pau Carl oca (Rio Wood pec kera CW Group), PO Box 2673, 20001 Rio d« Jarvairo, RJ, Brazil (with the cooperation of all other Breiiiiart CW grcups)^ The pyrpose is to prormote 2-way CW contecte between Bra^Jlian and OX stations, enabJino Ox st el ions lo obiain QSi-9 vaiid for s^everal Bfa^iltan Awarda. The event is held twice each year on tha last full weekend in March and the second full woel<end In October.
The general call is '*0Q B\0 DX PTY"". Use all HF amaleuf bands within your own atation-licenge authcflty. Exchange RST, name ar>d OTH. There aie no logs, but quick OSUng (via bureau Of direct; Is e&9entiaU
Reference ffequencles are as follows: 3510/3520. 7{l20f70aO« 14030/1 4050, 21030/21050. 21130/21150, and 28030/
FREQUENCtES:
Ptione— 1SI0, 3929, 7260, 14300, 21370, and 28800; CW— 60 kH^ uf^ f rtim bottom of eiach istdvice band; VHF— contacts on simptex only, excluding 146.52.
SCORiNQ:
Count orw point per QSO. Of! statioris muUipiy QSO points by the sunf) of states, provinces, countries, and OR counties. All others muttipiy by the sum of Oft count lee worked {38 maximum)^
EfiTRlES AND AWARDS:
All efitiles must have a log and sunv mary sheet, and if rriore than 200 contacts are made, a dupe slieet shqukt be included Entries may be disq^ualified if logs are in^ complete or loo many errors ajre ctetectetL You must sign ttie summary stieet stating that yc»j observed all iUe rules. You may photocopy log and dupe sheets or you may obtain extras from thie HAfiC (please send SASE), l^ogs must l» received buy No- ver^bef I2th and shoutd be addressed to tine Hemiiston Amateur Radio Oub.^ PO Box 962, Nermjston OR 97e3B Include a lafge SAS£ for a copy of the reeuita.
RHODE ISLAND QSO PARTY 1700 GMT October 1 a
to 0500 QMT October 14 1300 GMT October 14
to 01O0 GMT October 15
This contest Is sponsored by the Eaat Bay Amateur Wireless Association. Rl stations worK other Rl stations and tho reat of the world, AH others work only Rl stations. The same station may be wori^ed twice on each band: once on phone and once on CW,
EXCHANGE: RS(n and state j province^ country, or Rl
FHEQUENCiES:
Phone-3900, 7260. 14300. 21360. 2S600, 50.110, 144.2. and 146.52: CW-iaiO, 3550, 3710, 7050, 7110, 14060,
21050, 21110, 28050, and 28110. Use FM simplex; no repealers.
SCORING:
Ali Station* score 2 points per phone QSO, 3 points per CW QSO, and 5 points to4 QSOa with Novices and Tech n lei ar\s. Rl stations multiply QSO points by the number of states, provinces, ar»d coun- tries wprlted. Others multiply total QSO points by the number of different H\ cities and towns worked (39 maximum).
AWARDS:
Certificates awarded to top-scofing sta- than In eacti state, pfovlnce. country, and Rl county; plus top-scofing Novice and Tectmician in Bl and out of state. There will a.lso be a ceftiftcate for the lop Bl rmilti^opefator station.
ENTRIES:
Log* must show datelime in GMT, cait, exchange, t«nd. and mode. Inctude your n«me, call, mailing address, club afftlka^ Uon If any. total OSO points, multipliefB claimed, and final score. Entftes must be postmarked no later thar) Novembei 15th and should be sent to East Bay Amateur Wireless Associafior\. PO Box 392. Wanen Ri O^SSS. incli>cte an SASE for resulis.
MARYLAND-DISTRICT
OF COLUMBIA QSO PARTY
Starts: 1800 GMT October 13
Ends: 2100 GMT October 14
Sponsored by the Columbia Amateur Radio Association, the contest is open to ali sirtgieoperator stations. The same sta- tion may be wofked on each band and mode,
EXCHANGE:
QSO number; RSfT); and state, prov- irwe, country; or MO county. Remember that Baltimore and Washington are inde- pendent citiest
SCORfNQ:
MDC Stations multiply toiai OSOs by sum of MD counties, states* provinces, and countries. Others multiply MDC QSO tctai by number of MD counties and inde- pendent cities (25 maximum). Also, muLtU ply score by 1.& If running 200 Watts or less.
FREQUENCIES: Phone-3350, 7250. t4290, 21390, and
OREGON QSO PARTY 1700 GMT October 13
to OaOO GMT October 14 1S00 GMT October 14
to 0000 GMT October 15
Tlie Hermistor* Amateur Radio Club irv vitoi all arTtateura to parlicipate in the OfBoon OSO Party. Each station may be worked once pef band artd ofice per rrwde Cfoosband ar>d cfossmode controls are not permitlsd.
EXCHANGE:
Slignoj repoft and state, pr^ince, coun- try, or OR county.
102 73 Magazine • October, 19S4
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ALENDAR ARRL QSO Piny— CW |
|
|
Oct 13*14 |
ARRL QSO Party— Ptiona |
|
Oct 13-14 |
Rio CW DX Party |
|
Oct 13-14 |
ColumtMJS Day IfvtematJonai DX Contest |
|
Od 13-14 |
Marytand-DC OSO Party |
|
Od 13-15 |
OfiQcm OSO Party |
|
Od 13-15 |
Rhoii Island OSO Party |
|
Od 20-21 |
JamtMfee on the Air |
|
Od 20-21 |
Worlced AJI Y2 Contaet ! |
|
Od 20-21 |
CLARA Aci1>c Contest |
|
Od27-2S |
CO Weddwtdft DX^PtkHie |
|
Nov 3 |
PARC Cocona 10^M«tar RTTY Conlati M |
|
No«3-4 |
ARRL Sweeps tskes—CW |
|
N<n1t |
fanemational OK DX Contest |
|
Not 17-11 |
ARRL Sweepstakes— Phone |
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Nov 24*25 |
CQ WoHdwfde DX— CW |
|
D«1-2 |
ARRL 160M»eter Corkiest |
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Dec 8-9 |
ARRL l&Mpter Cofltest |
|
Dec 2e- J an 1 |
ORP Winter Sporti-CW |
|
Dec 30 |
CinMla Corrteet |
|
Jan 12-1S |
Hunting Ltons In Eh« Air CorrleBt |
2B590; CM— 60 kHz up from low end; Nov- lce-3720, 7120, 21 120, and 28120.
AWARDS AND ENTRIES:
Maintain a continuous log for phor>e and CW. ibut Indicate on entry which cate- gory (phone, CW^ or mixed) you are enter- ing. Certificates for top scorers in each category will be awarded. Mall logs, dupe sheets (for over 200 contacts), ar\d sumr mary by Novemtjer 30th to CARA, c/o Rob* eft K. Nauman WA2VUQ, 4017 Font HDI Drtve, Ellicott City MD 21041.
JAMBOREE ON THE AIR
0001 Local Time October 20
to 24O0 Local Time October 21
JOTA is Scoullng's annual ham-radio event, heki during the third weeleeFKl o1 OctOiber. This Is tt>e 27th ye«r ft has been held, writh thousands of stations around the globe participating. It pfopagaiion fa right, ^t is comjnon to work Scouting DXCC. In past JOT As, Scouts in some remote areas bike Antarctica^ Ascension island, Christmas island, Gough^ and Seychelles wens hteard,
in the USA, many Seoul Councils and Districts hold camporees to ooinci<!e with JOTA. Hams set up Fleld-Day-type oper^ atione. ghrfng campefs a chance to ex- change greetings with Scouts every- where.
Generalty, the exchanpes inctude typl^ caJ information If^e r>ame, QTH, Scout rank, tiols^ies, etc, with some leading to long-las tir»g pen-pai friendships and the exchange of photos, badges, and patcff- es. SSTV arvd ATV give some a chance to have a 'look-see'' at the other guy Other OSOs reported were via RTTY, EME, and even OSCAR.
Look for K2BSA (the BSA i-ieadquerters station in Dallas TX), HBdS (the World Scout Headquarters in Switjterland), and for other special call signs from many Countries.
Boy Scouts and Girl Scouts of all ages, Scouters, former members,, ham radio op- erators, and anyone Interested in doing a good turn for Scouting and ham radio are invited to participate. The contest period is given in local time, though some actlvl' ty flops over from Friday to Monday lo take advantage of DX time ditferences.
Suggested frequencies are 3690, 7030, 14070, 21140, and 28190 on CW; 3940, 7290, 14290, 21360 and 2d990 on phone: RTTY. SSTV, and ATV on usual frequent etes. Check the Novice frequencies and please move off tt^ese calling frequencies to avoid QRM.
No reports ir^ (tie form of logs are neces- sary, ^3 Is realiy not a contest. Exctiangea should be relaxed and relate to Scouting and ham radio as mucti as possitHe. Brief reports, however, are appreciated, giving Scout unit nunr>biers. ham calls used and hteerd/worked, numt>er^ ot paitici pants, tnteres^irvg incidents ar>d exchanges, etc. Photos with eapl forts especiaily welcome for the SSA repon lo the Woitd Bureau. Send them to JOTA t>>ordlnator W2GN0, 2t6 Mas well Ave., Hightstown NJ 06520.
Eladio amateute are encouraged lo in- vite Scouts or eyen Scout units lo theif shacks. If you do not know any, contact your tocaJ Scout office for ttie nanr>e ot the unil deader in your area. You or your redto club may volunteer to participate in a dls* trict or council campofee that weelsend, Pnor>e books list couricii offices as Boy Scouts of America. Call "CO Jamboree" or respond to such calls and observe all FCC reQuiations. Cufisider a fox h#tt for more fun.
if you are not a ham or do not have one I fb your unit, contact one in yowr af ea lor
help. If yoij need help finding one, contact Loo Kluger, American Radio Relay League, 2Zb Main St., Newington CT D6111. Make raports as Indicated above, coordinating with yotif ham tiejpdr.
Ceftlflcata c«rds the size of a postcaitl M6 avaitabit to anyone participating in any way. They may t>e ordered beforehand for pf^esontation during J OTA or they may be a: warded at Scout or club meeting:? later^ Seind TwqtmtH to Jamboree On The Alf. 13^ WalniJt HIIL Irving TX 75062. along witti an SASE larQe wiot^ to hoJd lh« cards ofxIerBd Affix postage al 20 cants ^Of the first 20 cards and 1 7 cents for each 8 QSr4^ thereafter,
A temporary insignia to wear on ttie Scout uniform or on jackets Is av^ifab^e at Si -25 from the TX address atx>ve. Sepa- rate ordefs for certificates and patches will gel them to you faster.
The World Scout Bureau, sponsor of J OTA, holds a QSl card contest with 5 prizes for the best handmade cards and 5 prizes for the best printed cards. Entries must be designed by registered Scouts (bioy or giri| 1i years of age or less. They must be In standard postcard size and be marked on the t>ack with name, age. Scout unit, and full home address (Include USA), Send entries to JOT A QSL Cont^t, Wof Id Seoul Bureau, PO Box 78, 1211 Geneva 4. Switzerland. They must be received by De- cembef 31st arKi er^lries will not be re- turned. Winners will be notified by March 91st. t| would t>eip if radio amateurs would Syggesi ideas about OSL<ard design, in- cMf rig Scoirt and tiam-radio caftoons, eic
WORKED ALL Y2 CONTEST
Starts: 15O0: GMT October 20
Ends: 1$00 GMT October 21
The Radiociu5 of the German Demo- cratic Reput>li€ (RKQDR) Is pleased to In- vite radio amateurs a^l over the world to participate In and commemorate the anni- versary of the founding of the German Democratic Republic. Opefating sections Include single- and multj -opera tor sta- tions as well aa SWLs, Each Y2 station may be worked once per band on phone and once per band an cw.
EXCHANGE: RSfT) piu& serial nu mb»er starting at 001,
RESULTS
1964 TWD-UND OSO PAHTY
Caft
MC2V W2B2IM
wA29@eM
K2HFV N2CQ
AB2W
VVB3IPX K2DNN K2PF W2CC
KA1CLV
W5WG
WBRYP
N*CLV
K1VUT
W6NR
WA7FKD
KilHQE
KSifiG
K5KIR
W31JT
KA7T
County
SalefD N4 Various Various HJ Gloucester H4 GlDucest^ NJ Gtoucester NJ Mercer NY CayufiaNY Chemung NY Somerset NJ Bergen NJ
MA
OH
KS
MA
TX
WY
lA
Wl
Mt
WV
ID
In Two-laTid OSOft QSO Pojnls 1290
§18
t3S
84
102
63
$1
56
30
2^
9
1
413
2sa
216
1^
1QS
112
79
m
25 2
Outside Two- Land
27
29 21 29 18 10 10
e
7
e
5
6
81 60 63 75 47 30
w
18 14 18 10
a
MultipliefS
1^ 41 54 5S 40 32 26 19 19
e
1
21
t9
18
17
15
10
7
Q
7
5
5
3
Score
249,480 16,933 I3,a06 12,528
931 3,466 2;912 1^1 1,140 ISO Z
1,701
1,140
1,13^
1,275
705
300
210
106
90
50 27
Y2 Stations will 9er>d a fw&<J7glt number Of "Kreiskenner^' instead of a OSO
IHJmtNSf.
fBBQUBNClES:
Um all aiTtateur bands, 3J thru 29 MHz, wim tru first 10 en<S last 25 kHz of the 3.5- and 14-MHz bands to remain contests ree.
SCOfUNB:
Count 3 points per Y2 QSO. Multiplier Is the sum of the number of different Y2 dis- tricts worked on eacti band (maximum of 15 per band). The districts are Indicated by the last letter of the call. Final ^core is the sum of QSO points multiplied by the total mulUpiier.
SWI^ count 1 point on phone and 3 points on CW lor each Y2 call witli sent
RS^. 2-digit nunriier, and cail of station worked with tt>e YZ.
AWAf^DS:
Certificates awarded to the leadpng sla^ tlons In each section of eact> country.
ENTRIES:
Separated logs are required for each band. Summary sheet showing multlptter and QSO worked on each t>and also re- quired. Each log must be accompanied by the following signed and dated declara- tion: "I declare that my station was oper- ated In accordance with the rules of the content, and in accordance with the re- quirements of my amateur-radio license." Logs ahouid be mailed within 30 days fol- lowing the content to: Y2 Contest Bureau. RKDOR, Ho^emannstr 14, DDR 1055 Ber-
lin, German Democratic Republic. In ths case of any dispute, the decision of the Y2 Contest Bureau shall be linal. Appiica' lions for awards issued by the I4KDDR 1 un- filled in ttie contest may be sent together wfth the contest log and indicated fee.
CLARA AC-DC CONTEST
Starts: 1800 GMT October 20
Ends: 1B00 GMT October 21
Sponsored try the Canadian Lejdies Am< ateur Radio Association, the Ac^Oc Ckih- Umt Is open (o aJI YL and OM amateurs. E^h station may tie worked twice^ either once on CW and once on plK>ne, of on two different tuar^^.
EXCHANGE:
Signal reports, QTH, and name. Bonus stations will be operating and will Identity as such. Each bonus station may be worked twice, once on CW and once on phone, but it must be on different bands.
fREQUENCiES:
Phone— 3900, 3775, 7150, 14280. 14190. 21300. 26508, and 26488; CW— 3690. 7035, 14035, 21035, and 28035
SCORtNG:
GLAflA members score 1 poini per coo- tact with nonmembers, 2 (>oint$ p^ CLARA-membef contact, and 3 points per bonus station. Multiply by two for con- tacts made on CW. MultipJy total ol the above by I tie number of Canadian prov- inces^erritones worked for total score. Non-CLARA members count points Ili« same except only CLABA^mefTi^^ cor*- tacts are lo be counted.
AWARDS:
First-place CLARA cup and certificate to fir St- place CLARA winner, certificates lo second and third. Plaque and certifi- cate to first-place non-Cl^RA winner, cer- tificates to second and third.
ENTRIES:
Ail Logs submitted are eHglble for the mini prize drawing. Mall ail logs and scores with your name, call, address, and postal code by December I5th to: Muriel Folsy VE7LQK RR #1, Pender laland, BC, Canada VON 2M0.
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73 Magazine • October, 1964 103
INTERNATIONAL
from page 60
Classes: A, up to 1 kW; B^ up to 250 W, and C, up to 100 W. Afl Stations may be either fixed, mobiles, or portables and of Ihj'ee other categories: land^ marftfrne, or air- borne. Operators are classified as belong- ing to any of three categories:
• Superior: able to operate class A sta- tions on all authorized bands.
• Intermedia: autfiorlzed to operate class B stations on 160, 30, 40, 10, 6, and 2 meters, and in the portions 14.000 ia 14,200 and 21,000 to 21250 l^/^Hz.
• Noviolo: authorized to operate class C stations In 1&0, 00, 6, and 2 meters, and In the portion 7.1 OO lo 7.150 MHz.
Jt is compulsory for all amateur-radio stations to have operational equipment in the 40meter band. This is to be able to participate at any moment in case of emergency, fn ttrls context, it also is man- datory for all clubs and amateur- radio or- ganizations to maintain a schedule of radio watch and frequency control on all bands^ under supervision of government authorities.
To get a license you must be Peruviahi either by birth or national a zat con. If you are under 18 years old, ^ou must get legal per- mission. Foreigners also can get licenses It their residence in the country Is for more than 5 years, or 3 years If married to a Pe- rtrvian citizen or have Peruvian children.
The first license Is issued for the Novice class after an examination on elementary electronics and communications and practical station operation. Vou must re- main in that class until you get 100 OSL cards. To upgrade to Ihe next category, you must apply for another examination on radio communications: You must be proficient In radio station operation and must be able to receive and transmit CW at 5 wpm.
You also must remain in that category until you receive another 100 QSL cards. Then you may apply for another examina- tion on advanced electricity and electron- ic fundamentals, proficiency in radio sta- tion operation, and musl be able to trans- mit and receive CW at 10 wpm.
The Novice license is issued for a peri- od of 3 years, not renewable. Thus, you must attend an examination within the next three years for upgrade or your li- cense is cancelled. The other two catego- ries also are issued for periods of three years but are renewable for similar peri- ods, licenses under a reciprocity agree- ment are vaitd for up to 90 days only.
The Di race I on de Telecom unlcac tones car> authorize the installation and opera- tion of amateur-radio stations to the mili- tary, radio clubs, and amateur-radio Insti- tutionSp Peruvian Red Cross, Civil De- fense, and scientific institutions in the areas of seismotogy, meteorology, and geo physics, to be operated onfy by licensed radio amateurs.
Of all the above, It Is relevant to note that foreign operators can appiy for a reci- procity-agreement license for only 90 days, but if he Is a resident, he will get DA prefixes v/ithout restriction. Unfortu- nately not all countries haye this preroga- tive. Also fnteresting is that amateur-radio stations installed at institutions like Civit Defense or Red Cross must t>e operated by licensed radio amateurs. In some coun- tries, there are even citizens-band organi- zations or Civil Defense stations with am-
104 73 Magazine • October, 1984
ateur-radio stations operated by anybody able to press the PTT button.
The above information is based on cur- rent regulations, Decreto Supremo 009- 74-TC, dated April 31 , 1974.
That's all, I hope some fellow Peruvian will continue this writing from here on. 3n doing go» we'll see again the red and white flag waving in 'T5 International/'
PHILIPPINES
Leo M. Almazan WA6LOS/DU2 10098 Knight Drive San Diego CA Q2126
In my last column I wrote about the am- ateur-radio scene in the Philippines today. After a rather nice lengthy QSO wftii a W7 ham from Seattle, Washington, who hap- pened to be in the Ptiiiipplnes before World War tl, he not only told me how the>^ used to DX on 40 meters with RCA's CW rigs, and Arc-BS receivers coupled to high zepp antennas, he also sparked my curi- osity at)Out the history of amateur radio in the Philippines^
After talking to the local OT hams in the country, I came up with pieces of Informa- tion that any wireless nostalgia buff may find rather interesting. In this column I will talk about the history of amateur radio from World War I righl up to World War 11. In a subsequent column 1 will deal with the
history from World War 11 right up to the early sixties.
The first wireless station in the Philip- pines was the powerful US Army sparl< station on Corregldor Island {made fa- mous by General Dougtas Mac Arthur's last-stand battleground} which was used to guFde ships in and out of Manila Oay. The second famous station was the NPO, a US Navy spark station near their Sang- ley Point Naval Base. Both of tiiese were built about or iu3t before the US had en- tered World War I.
From this time fill 3ate 1919, the ama- teurs here followed US regulations since the Philippines was a US territory, and transmissions were considered 1 1 legal. Not till 1920 ^even when the Philippines Legislature did not pass any radio laws till 1S24) was anyone given permission by the Bureau of Post to start transmission. Even then, due largely to confusion, amateurs were still using their InUlals as callstgns. Before the 1920s, the local hams and US service personnel were on the air using whatever parts they could scrounge. Some were using o^d Ford spark coils^ co- herers, and galena detectors that were bought stateside from H. Gernsback's E, 1. Co. catalog, then considered as the 'bible of wireless."
In the early twenties, American hard- ware stores were selling "wireless toys" made by the famous A- C, Gilbert Co. of New York^ the maKer of the also-famous Erector sets. Each set consisted of an un- tuned crystal detector, headphones, an in- door aerial kit, ground connector, a key^ and a single-circuit heavy-duty buzzer tor the transmitter in&tead of the two^ircuit, spark coil. With such sets, neighboring amateurs could play wireless and learn the code by actual communication. No li- cense was required.
In the thirties, several ham stations sprouted in the country. The most notable was KA1HR, a multi-op, l-kW station at a US Army base in Fort MacKlniey. (The
"KA" prefix was used since the country was still a US territory.) In the early thir- ties^ the 1-V-2 ''super wasp" was consid- ered the standard station receiver. Other home-brewed receivers were buiil using the type-30 battery tubes. Commercial re- ceivers also were available, like the Na- tionai SW 2, SW 5, and the HBOs.
Most Americans were already using multi-stage, c ry sta I -cont rolled transmit- ters as required by US regulations, but the locals were still using self -excited, single- stage rigs.
Antennas were mostly ha tf- wave sky wires, like the voltage-fed zepps with tuned feeders. Some used current-fed Herti, or the single untuned, off-center -fed Windom antenna.
AM phone started appearing in the mid- thirties, exciusiveiy operated by American hams mostly on 40 and 20 meters, though some were experimenting on 160 meters. Most transmitters were home-brewed and the receivers used were hlgh-<3uaiity su- perhets to ensure stateside reception and to avoid ORM.
DXing remained on 40 meters even though competition from SW broadcast- ers was appearing in the band. The 40me- ter CW bandwidth had been cut from 300 to 150 kHz during the International Radio Conference In Cairo in 1938, but CW DX Ing was sttlfc done primarily in this band. The US west coast came around 10:00 pm, South Africa around midnight, followed by the Europeans in the early morning. The top DK certificate then was the WAC, and many CW DXers had won it during the thirties.
Well this fs it for now. Also, words are circulating that the Gl^ass B licensees will be sporting a "DW" prefix, so watch out for this new one.
PERU
POLAND
Jerzy Szymczak 78-200 Biaiogard
Buczka 2/3 Fot&nd
The Board of the SP DX Club issued 13 member diplomas recently. The last diplo- ma number is 323, Every candidate for the diploma must produce QSL cards con- firming mutual radio contacts with his own radio station with 75 countries on 6 continents. After a 6-month period, he can receive tha diploma if he produces QSLs from 101 countries. Actuary, 25 candi- dates are waiting for the diplomas.
There are 1710 honorary members of SP DX Club. To every European sender who establishes mutual communication with 15 full members, and to every extra- Euro- pean ham who possesses at least 10 such QSLs, this honor can be done.
TheSP DX Club celebrates its 26th anni- versary in J une this year. Eight SP senders have over 300 confirmed countries. There are 1 12 SP symbols on SP DX honor list for establishing 200 confirmed radio con- tacts. Leading radio amateurs of the SP DX Marathon are: SP3D0I (4334 points), SP3AGE f4235 points^ SP7HT (4086 points), and SP&EWY (4054 points^
The first Polish winner of the WAC Sat- eiiite diploma suggests that Polish send- ers publish the 10 most- interest ing QSOs of every year. On his own first list, he put, among others: the first QSO (AprlE 3, 1983, on 7 MHs CW with SPSEVP. after martial law break), the first Polish contact via OSCAR 10 (August 15, 1^a3, with DjaRE). and the first contact with Australasia via satellite.
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Twenty Polish amateur stations look pari \n the All Asjan OX Contest SS8 1963. The beat were SPBEMO on 3.5 MHs, SP9EMI on 7 fAHz, SP5LM on 14 MHa, SP7AWA on 21 MHz, SP6DNS on 28 MH^, and SP9ALM on SOMB and SP7KTE on MOMB. Dipiomas are awarded these stations.
PoNsfy Scouts radio amateurs are always on the go. On the occasion of the 70th anniversary of Scouting, the Scouts Communication Club organized the le^z- no Contest UHF '64 that took place In De- cember, 1983. Sixty UHF radJo stations took part in the contest The best fndfvi du- al stations were: SP6QZZ (2712 points}, SP3JBI (1917 points), and SP9MM (1617 points). The best ctub stations: SP6VVCY (1066 points). SP2KFE (169 pointsl, and SP32HW (115 points). UHF radio amateurs from Leszno were informed ttiat every Fri- day (2200 local time) has been set up as an activity day of Leszno stations using ra- diotelephones. Most of thern wor^ on 14S.200 MHz with antennas with tjoth ver- tical and horizontal poladiation.
A new Scouts diploma, CZUWAJ, has been establisbed recently. It is awarded by the Wroclaw team, SP6ZDA. To get th\^ diploma one must acquire 50 points and assemble all the letters belonging to trie wofd CZUWAJ (WATCH E). Selected sta- tions send Individual letters. Stations with stationary QTHa grant 4 points, and with local QTHs 6 polrtts for every QSO. Eight points are awarded for QSLs with Scouts ceremonEai stations. Contacts on UHF are counted double points.
In February this year, the first Polish re- peater UHF'FM was set in motion. It has omnidirectional antennas with vertical polarisation. The repe^iter works on the R channel. It receives signals on 145000 MHz and transmits on 145.600 MHz. A 100-km range for the repeater has been es- timated. Its callslgn is SE=t9E
^^.i^jrw-'
Roger de We&ver 9Y4RD.
TRINIDAD AND TOBAGO
JohnL Webster 9Y4JW
c/o Department of Soli Science
Unfverstty af the West indies
St Augustme
Trini^&d
West Indies
9Y4RD COMES HOM£
On March 24, 1984, Roger de Weever 9Y4RD returned home for a well-deserved three- week vacation. Many of the DXers out there will be familiar with Roger's call- sign, which has popped up in the past two years from such good DX locations as SU and STii, and they may have received his attractive and amusing OSL
At the monthly general meeting of the TTARS held on April 2nd, Roger was our guest of honor and addressed us for about one hour on his experiences in the Middle East, 1 was also privileged to have a lengthy (si>;-hour!) and very interesting eyeball with him about one week later.
Roger, now 35 yeans old and married to a very attractive lady, Carmen, began his oareer in commercial radio in 1969 as a Ship's radio officer, after graduating from college in England. In 1970, he changed Jobs to become a radio technician with TEXTEL (Trinidad and Tobago External Telecommunications), In the ten years that followed, he worked his way up through the company to the position of Acting Maintenance Engineer at the Sat- ellite Earth Station located at Mature, in the northeastern part of the island.
106 73 Magazine • October, 1984
1979 was the year that Roger made the decision to become a ham. On the strength of his experience both as a ship's radio officer and his technical experience as a communications engineer, he ap- plied for the license and was issued the callsign 9y4RD— his initials, (Here in Trinidad we are allowed to ctioose our cad I signs, provided It has not previously been Issued or otherwise reserved.)
Roger, in 1980, tooK up a job with the United Nations as a Field Service Officer in communications, lo serve In the Middle East, and was based in Jerusaiem, Israel. However, In the year prior to his departure, Roger, although only Involved in limited activity on the air — mainly local 2m and some lOm OX — devoted Gonsiderabie time to the training program of the TTARS and helped prepare about 30 students tor the annual City and Guilds RAE Exam. Most Of the students were successful in the examination, and needless to say, after Roger's departure, he was sorely missed by the TTARS.
In his new UN job Roger found the chal- lenge he had been seeking I He has had to visit and work In such countries as Egypt, South Sudan, and Lebaraon and is based in Israel— the world's hot spots f He has tieen Involved in recommendations, de- sign, and establishment of & variety of communications systems, both HF and VHP, in these countries, to assist both the local governments and t?ie UN in their law- enforcement and peace-keeping activi- ties. He is not involved in military commu- nications and says that In spite of being based In one of the world's most turbulent areas, he has always been well treated and shown great respect and never felt tfiat hia life was in danger.
Roger's amateur-radio activity from the Middle East began In September, 1982, from Jerusalem, with a MX callsign. His op- eration from SU commenced In October, 1982, and when in I9d3 he was stationed In ST? for about 7 months, once again his ham equipment was lugged along. The equipment that Roger has used in his ac- tivity consists simply of a Yaesu 902 DM and a four-band trap dipole.
One of his ambitions from each of the QTH3 he has operated has been to get a DXCC, and he has so far achieved this from: STO— about 2500 QSOs and 130 countries; SU— 9000 QSOs and 185 coun- tries, and 4X— 1500 OSOs and 150 coun- tries. Whereas Roger enjoys ham-radio operation from comparativeiy rare DX lo- cations and will always try to comply with another ham's request for skeds, etc^ he detests his operations being referred to as DXpeditions. He does not go on DXpe-
dltlons in the Middle East. He is simply working In whatever country he Is QRV from, and all his amateur-radio activities
are done in his spare time as a form of relaxation.
Incidental iy, Roger has been doing quite a bit of badly needed PR worl< for ham radio in countries such as SU and STO, where amateur radio is neither un- derstood nor encouraged as a worlhwhile hobby, in his job he works alongside many locals, most of them being qualified radio technicians, and wherever possible he tries to educate these persons and any others Interested In the benefits and use^ fulness of this hobby we all enjoy.
One interesting fact revealed during the course of our discussion was the way in which ham-radio activity has assisted Roger in his job. The practical experience gained In antenna performance and con- struction, propagation conditions both on HF and VHF; and even |usi the way hams get things dene when others fail, have all combined to make him successful In his job. It Is especially for this reason that he has always mad© a point of lugging atong his trusty 902 DM, as heavy as it is, wher- ever he has traveled.
By the time this article appears in print, he will Jong since have returned to con- tinue his tour of duty In the Middle East. Roger's plans in the coming months in- clude stints in SU and ST*. He already has re-eQUipped himself with new radio gear. From his home QTH he will be using the new FT-980 by Yaesu and a Cushcraft R3 triband vertical— the one that's ideal for apartment dwellers as It needs no radial s! His portable operations will tie made with a much mora compact and lightweight transceiver^ the I com lC-730, and his old 4-band trap dipote.
Roger has Indicated that the following are some of his favorite operating fre- quencies and times:
|
14.220 MHz |
0700Z |
|
21.157 MHz (DK9KE Net, |
mainly |
|
weekends) |
1000Z |
|
21 .335 MHz |
1&0OZ |
|
28.550 MH2 |
1300Z |
|
1 4.332 M Hz (YL system) |
Occasionally |
|
AllOSUfor9Y4RD/. |
, . should be sent |
directly to his QSL Manager, KA2DDJ, as he does not have the time nor QSL cards to handle QSLs himself.
Wherever Roger is QRV, you should have no difficulty identifying him, since, as a patriotic Trlnldadian, he plans always to retain his 9Y4RD callsign and operate as a portable.
VENEZUELA
Luis E. Svarei OA4KO/YV5 Apartado 66994 Caracas 1061 -A Venezueis
CIRCUITO 2 (YV2)
In Venezuela, call area 2 is composed of the states of Tachira, Merida, and Barlnas- The first two are Andean, with cities at altitudes ranging from 100 to 3100 meters. Barlnas state, however^ is lo- cated in the plains on the eastern siide of those states and faces the Andes.
San Cristobal is the capital city of Tachira. It is located in a hilly terrain, al- most like that of San Francisco. It is a modern city with all the traffic and noise that civilization carries on,
Down the Andes there is another city with a funny name: La Fria {the Cold). When you arrive In that city you will expe- rience tropical heat, but la. Fria earned its name from a type of malaria which caused terrible chills and continuous chattering of the teeth. At first it was just some blacK humor, but the name remained. Today it ts a prosperous zone with a superhighway linking ihls city and San Cristobal San Cristobal's nearest airport is at La Fria.
Merida, the highest state in the Andes Is called the Tacho de Venezuela l[Roof of Venezuela), Captain Juan Rodriguez Sua- rez (no relation) founded it in 1556. In fact^ he was not authorized to found cities, so he was rushed to Bogota, arrested, judged guilty oJ the usurpation of Royal preroga- tives, and sentenced lo be dragged by the tail of his horse until dead and then to be quartered. However, he escaped to Vene- zuela and got asylum.
In Merlda Is located the highest moun- tain of Venezuela: Pico Bolivar. This mountain Is 5,700 meters high and wears a perpetual snow dress. It has the highest and the longest cable car In the world; it takes one hour If you go straight to the top. There is some skiing heref but it is not recommended unless you are profession- al. "It is oul of this world, and astronaut training is recommended for the success- ful Pico Espejo skier" {Ve Venezueia).
Driving from Merlda city down the plains, and heading to Barlnas, Is some- thing you'll never forget in your lite, At first you go up the mountains to the An- dean paramo, it is as inhospitable, cold, cloudy, and damp In the rainy season as it is dry and drab in the dry season, it is so Isolated that you feel you are between life and death. You feel the necessity to stop your car and listen to the silence. I did and was surprised to know that the only plants in the zone, the frailejones, are really fra- grant and they perfume the paramo.
At Apartaderos, midway between Merl- da and Barlnas, you may visit CI DA, an astrophyslcai institute, with Its four tele- scopes, among which are Coude Casso- grain, a double astrograph and a great reflector, as well as a Schmidt Camera, Visitors are welcomed.
Continuing to Barinas, you may have di- rect radio contact now via 2m FM repeat- ers with Caracas or Maracalbo, as I ex- plained in a past column. Continuing with the trip and heading to Santo Domingo, you see the vegetation begin to change. After Santo Domingo, a snaking road heads you down to the plain. The moun- tains become green and you see small wa-
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73 Magazine • October, 1984 107
terfalls coming naar the road. Tempera- turn increases and tropica^ veg^tst^on breaks all around as you approach Bar^ nas, the capital ctty ot Barlnas state.
Barinaa ia flat and becomea inundated during the rainy season. Sine© the north- west part at this state la toward tha Andea, most of the towns are locaied \n the foiling foal hills at the edge of the mountains.
tn my next column, I will bef|in de- scribing call area 3: Lafe, Yaracuy, and Pwlyguesa,
MAP EXCHAKGE
f Whm dty fnaps; if anytiodv out there ^s tfiterest&d in maps^. too, tet me knovv. Send ftm a map of your city and I wit I exchange vtiih the ma{>of Caracas P^^ase be aure U la a deiaiieo map with ell streets. (Canr»ot
use those which advertise relative loca- tions of historical or Interesting ptaceSn liKe lour maps or souvenir meps) From the USA, Rand McNally ia preferred; Dolph Is OK. If you know your Maidenhead grid locator {with €-character precision), please mark your QTH, Otherwise please dOn"t. Let me find it myself I
COMUNiCA BULtETIN
Also 1 wish to mer>tion thai Tm publish- ing a Spanish newsletter namecS COMU- NICA. \f Ittere is anyt>ody wishing to spread any information to Venezuelan and Latin Ametican radio amateurs, let itie lKnow. The tiufletin is distributed monthly in all Latjn American countries. Subscription ts USS^S.OO fir^t -class Air Mail pef t^vetve issues. As far as I know this Is if>e first communications bulletin
Jn Spanish ever published and distributed In 19 countries.
tf you would like to take a look, send me your address and I will forward you a sam- ple. Maybe you would like to include, with your fequest, news from your fadio club for publication. If somebody is publishing sofTtelhlng similar^ an exchange is d& Sired. Polish, Chinese, ar^ Swahili bulle- tins are accepted.
FEEDBACK
I wish to thank all those colleagues who sent cards ar>d tetters, Alt those that re- quested intormaiion and services wete re- plied to Of the reQueet accomplished. I have published in COMU^itCA lt>e re- quests f couldnl answer In the hope that sometiody was able to reply directly.
flegarding the article on parabolic an-
tennas (7J, May, 19&4}, \ wish to mention that the article was intended to be as tuto- rial as possible. Really. I have no plans or drawings for construction and the inten* tion was that you personally develop your Own design. If yoo don't have the ability to construct a parabola, neither a drawing or a picture wili help.
I guess the t>est solution is to make the drawing yourself and find sometiody who feels comJortabie with mechanical struc- ture 10 help yOii in construction. Anothw approach is to get ari already made parab- ola and to experiment with differeni feed- ers. Wilh the information in the articte you would be able lo know what yoiu ge! and wtiat you need lof your particular apiHica- ttOTL TTve last recomme^ation iz that you starf with a 1-meter dish and then qo ahead with a larger one if necessary.
FUN!
John Edwards K12U
PO Box 73
Middie ViliBge NY ft 379
CALLSIGNS
What does your caiifaign mean to you? I know my call means a tol to me. On the air, It's my name. When I v^sit hemfests, my calisign badge leis people know wtio I am. There may be hundreds of thousands of John Edwardses on this sad old planet^ but only one K{2U, Thank heaven.
Unlike my name. I've held a number of calls over the years^ Including WQ24BE (my original), WR2APG. WA2DCS. and ot course KI2U. When I upgraded from Ad- vanced to Extra back in 1080, I had to do some serious soul searching before changing my call. My old ID had served me well over the years and, naturally, I was re- luctant to make such a drastic change in my amareur-radlo lifestyle Still, a snappy 2x 1 call has it« advantages^ In pileupa^ so I reluctantly turned In my old 2x3 trada* mark for KI2U
ELEMENT 1 MULTIPLE CHOICE
1) Before the FCC reshuffled the amateuf call sign allocation process in IB 7ft, what did a WT prefix signify?
1) A Technician-class licensee
2) A temporary license
3) Nothing in particular
4} A ham In the third radio district
2) WN prefixes were formerly reserved for 1^ Novices
2} Interim licensees 3|Sec^>ndary licertses 4) Repeaters
3) Tuning around 20 meters one night, you hear a statiion segning KAiQi^M Why do you suspect he is a bcotfeggef?
t^The FCC doesn't usually Issue calf suffUes that are aiso Oslgnats
2) KA calls aren't allowed on 20 meters
3) The FCC doesn't issue calls with a OxK suffix
4) You don't know
4) What's wrong with WR2APQ, New York's favorite 220MHz slow-scan TV repeater?
Iflt's using an expired call
2) Repeaters aren t allovt/ed on 220 NflHz
3) Slow-scan TV isn't allowed on repoatera
4) t^lothing 6) What was the callsign of the AflRL's first headquarters station?
DWIAW
2)1AW
3)W1ARRL
4)W1MK
ELEMENT 2
FILL IW THE BLANKS
Fin in the calls of these prominent hams of the past and present:
1J Arthur Godfrey
2) King Hussein
3) Barry GoEdwater
4 J Mahmud Reia Pahtavi fShah of
francs son; now the current Shah) 5> Tom Chtistian
>.'
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|
ELEMENT 3 |
aa*9vi |
T) Singapore |
|
TRUEFALSE Tnia Fitse |
Z1) 5IJ7 23) TA |
U) Argentina V) San Marino W) Chile |
|
jrograma its So it won't cer^or aug- |
24) H8 ^ST |
X) Guernsey Y) Pitcaim tsJand |
gaativa amaisiif call-
2] All tMoadcasf statiofis oast of the Mississippi hav^ Wcafis^gns.
3)WHA$lstdcatedln Louisville. Kentuclcy.
4) A broadcast ^tattort may select its calk
5) OSCAR 8^3 callsign was W120SC.
6} Lee DeForest, famed radio inventor, held amateur call tOF. 7} The FCC issued the first K caFfs to con- tinental US hams during 1943. a)W2XAMisrtOf aham
caMsIgn, 9) The Federal Radio Commission tiegan is- suing w and K caMfi \t\ ^948. 1D)KCBS islocatod In
Los Angeles CA. 11} Hlfam Percy Maxim's first callsign waa SNW. 12) Marconi once received ttl FCC Citation for fatlir>g to propefiy iden- tify !i is station.
ELEMENT 4 MATCHING
Matc^ the prefixes \t\ ColMmn A with the ootinirlea in Cotumn &
Ceiumn A Colimin B
T}CP A) Grenada
3 LU B) Sikltim
% 5H1 Q\ Ptilllppines
4} LZ 0) Malawi
5) J3A E) Colombia
6) GU F) Iran
7) SR G) Zanzibar
3) OU H) Switferlar^
9) 3DZ Ij Mauritania
tO) ST5 J) Papua Mew Guinea
t1)AC3 K)lrerand
tl^VRO U Soviet Union
13) HK Mi Sudan
\A) Ml H) Bolivia
t^ EP O) Tufftey
16)D4C RFIH Islands
t7)El Q) Guyana
t0)CE R)6uigana
m 707 Sf Caoe Verde
THE ANSWERS
Bfement ?.
1—2 Usually issued by t^e local field of»
Fice wfien Gettysburg screwed up an
applicaiiorL Z — 1 Also KM piefixes for a while. 3—1 Sort of helps topf&vent confusion, 4 — 1 Alt WR prefix repsater calls ha¥e
expired, 5—4 It got wtped out in a 1936 flood.
Ef&ment 2: 1— K4UB
3— K7UGA
4-e}<-EPl MP 5-VB6TC
Efement 3:
1 — Tru e Al 1 1 h e funny on as .
2— False Moat, but not all (e.g,, KOKA In
Pittsburgh). 3-Trye All 50 kW of IL 4— True But hams can'L Not fair, really. 5— False Satellites don't require a call, 6— False De Fore at wasn't a ham. 7— True During the fall. 8— True It's a call for experimental
steUons. 9— False The year was 1329, to— False It's iri San Francisco. 11— True Around 19U, the days when
you could make up your own
call. 12— False Marconi's radio experiments
were completed by the time ttre
FCC came into iMing,
1-N, 2-U, 3-G,4-=^n, 5~A,e— X, 7-Q, fl— C, 9— P. 10—1. 11— B, 12—^, 13— E* 14— V, 15-F, 16-S. 17-K, 18-W. ig— D, 20-T, 21— Z, 22— J, 23-0, 24— H, 25— M.
SCORING
Ffve points for each correct answer.
Eiement 2:
Rve points lor each Cdll correctJy filled tn,
Eiement 5l
Two points for each oorfect answer.
Efement 4:
0(¥i point tor each correct match.
How^Kdyoudo?
1-20 poinis— Called qm\ 21-40 points --CaH for t^p 41-60 potnls— Call bacit §1-80 points— On caU ai-99 points— A call to remember!
100 73 Magazme • October, 19&4
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BIGGER IS eETTEfl/
Fox Tango filters are better because of their discrete crystai (not monolithic) construction. This makes
them slightly larger than YK filters so they are patched into the circuit with short iengihs of coax InstaflatFon is easy — no driiiing or circuit changes. Order with confidence.
COMPLETE FFLTER KITS — $SD EACH
AM— FT2ei1 (eoOOHz Bandwidth)
SSB-'FT280fl (ISOOHz); FT2e09 (2100Hz)
CW— FT2801 (ESOHzJ; FT2802 (40€HzJ
Kits include all needed cabfes, parts, detailed instruc- tions Specify me type(s} desired:
NEWJ FILTER CASCADING KIT $85
Extra taii end J-F filter improves SSB/GW selectivity and dynamic ^j^j^^.k? range while reducing RX noise- No effects on TX, AM/Ff^. Price in- cludes 2,1 FT filter, new PC board, teffon coax, d eta i fed instructions, etc. Shipping: $3, Air, $5 (If COD add $1 ), Overseas $10, FL tax S%.
FOX TANGO CORPORATION Box1S944T,W.P^m Beach, FL 33416 m^ 139
Phone: (305) 6fl3-9S87
ATTENTION
Foreign Computer Stores/ M^^azine Dealers
You have a large technical audi- ence that speaks Ejiglish and is in need of the kind of microcomputer information that CW/Peterborough provides.
Provide your audience with the magazine they need and make money at iJie same time. For details on selling Microcomputing, 80 MICRO, inCider, HOT CoCo, RUN, jr contact:
SANDRA JOSEPH
WORLD WIDE MEDIA
386 PARK AVE., SOUTH
NEW YORK, NY 10016
PHONE (212) 686-1520
TELEX— 620430
1985 CALLBOOKS
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Order today!
NEW 1985
RADIO AMATEUR CALLBOOKS
READY DECEMBER 1st!
Known throughout the world for accuracy, the 1985 CaMbooks list the names and addresses you need for your QSL's. Arranged for easy reference, the U,S, Call book con- tains over 433,000 listings; the Foreign Call book has over 413,000. More than 100,000 changes have been made in each edition since last year. Special features include call changes, Silent Keys, census of amateur licenses, world-wide QSL bureaus, Internationa] postal rates, prefixes of the wortd, and much more. Why settle for less than the very best? Order your 19S5 CaMbooks now for earlfest delivery,
Baeh Shipping Toial
aU,5. Callbook $21.95 $3.05 $25.00
n Foreign Callbook 20.95 3.05 24.00
Order both books at the same time for $46.00 including shipping within the USA.
Order from your deaJer or directly from the publisher. Foreign residents add $4,55 for shipping. Illinois residents add 6% sales tax.
Keep your 1985 Caltbooks up to date.
The U»S. and Foreign supplements contain all activity for the previous three months Including new licenses, Available from the publisher in sets of three (March 1, June 1, and September 1) for only $15*00 per set including shipping. Specify U.S. or Foreign supplements when ordering. Illinois res- idents add 6% saJes tax. Offer void after November 1, 1985.
flAOlO AMATEUR
ca
Dept, B
925 Sherwood Dr., Box 247
Lake Bluff, I L 60044, USA
Tel: t3I2} 234-6600
llboolc
INC, >-6l
1h
Brings You
The PACKET Breakthrough
PACKET RADIO lets you share a simplex channel error-free with up to 20 simultaneous users at 1200 Baud.
AEA introduces the MODEL PKT-1 PACKET CONTROLLER. Through an arrangement with TAPR (Tuscon Pacl<et Radio, Inc.), AEA brings you the proven performance of the TAPR kit board and software in a rugged metal package, fully wired and tested with a full year's war- ranty and with all the free appli- cations assistance you can stand.
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Using onJy your existing radio and RS232 terminal (or computer), you can join the rapidly expanding packet rad^o community. Operate on VHF, HF or satellite and talk to more than 1000 existing packet users. Store messages addressed to you automatically and read them from your printer or monitor later Easy to hook-up!! Easy to uselJ
Call today for the rest of the story: 206-775'-7373ff
Better yet, see your favorite AEA dealer.
Advanced Electronic Applications P.O. Box C-2160 Lynnwood, WA 98036
All right, AEA, send me info fast
ITo: AEA, P.O. Box C-2160,
iLynnwood, WA 98036
1
I —
I Name
Address
I
I City. State, Zip
i
j! Phone
Date
t^ See list af Adv&rtisers qh page 98
73 Magazine • October, 1964 109
THE MOST AFFORDABLE
REPEATER
ALSO HAS THE MOST IMPRESSIVE PERFORMANCE FEATURES
{AND GIVES THEM TO YOU AS STANDARD EQUIPMENT!)
JUST LOOK AT THESE PRICES!
Band
Kit
10M,6M,2M,220 440
$680 $780
Wired /Tested
$deo
$960
Both kit and wimd units artt GOfffpi^te with ^ii p&ns, moduies^ fjurdware, and Cfyafa/s,
CALL OR WRITE FOR COMPLETE DETAILS,
Also av&ifabie for mmom sUn Hnking, crossband. and mmotB bas^.
FEATURES;
• SENSITIVHY SECOND TO NONE; TYPICALLY 0.15 gV ON VHP, 0,3 uV ON UHf.
• SELECTIVITY THAT CANT BE BEATI BOTH
8 POLE CRYSTAL FILTER & CERAMIC FILTER FOR GREATER THAN lOOdB AT± 12KH2. HELICAL RESONATOR FRONT ENDS. SEE R144, R220, AND R451 SPECS IN RECEIVER AD BELOW.
• OTHER GREAT RECEIVER FEATURES: FLUTTER- PROOF SQUELCH. AFC TO COMPENSATE FOR OFF-FREO TRANSMITTERS. SEPARATE LOCAL SPEAKER AMPLIFIER & CONTROL.
• CLEAN, EASY TUNE TRANSMITTER; UP TO 20 WATTS OUT (UP TO SOW WITH OPTIONAL PAJ.
HIGH QUALITY MODULES FOR REPEATERS, LINKS, TELEMETRY, ETC,
HIGH-PERFORMANCE RECEIVER MODULES
m44 $hQmn
• Rt44/R220FMRCVRSfor2Mor220MHz. 0,1 5uV sens.; 6 pole xtal filters ceramic filter in i-f, helical resonator front erxJ tor exceptional selectivity, more than -1 CX) dS at ±1 2 kHz, twst available today- Flutter-proof squelch, AFC tracks drifting xmtrs. Xtai oven avail. Kit only $138.
• R451 FM RCVR Same but for uhf. Tuned Ime front end, 0,3 uV sens. Kit only $138.
• R76 FM RCVR for 10M, 6M, 2M, 220, Or commercial bands. As above, but w/o AFC or heL res. Kits only $118.
Also avail w/4 poie filter, only $3&/KiL
• R110VHF AM RECEIVER kit forVHF aircraft band or ham bands. Only $98.
• R11 0-259 SPACE SHUTTLE RECEIVER, kilonly $98,
amironics
110 73 Magazine * October, 1984
^^2&S
TRANSMITTERS
^
T51 VHF FM EXCITER for 10M, 6M, 2M. 220 MHz or adjacent bands. 2 Watis contin- uous, up to 2V^ W intermittent. S68/kit,
T451 UHFFM EXCITER 2 to 3 Watts on 450 ham band or adjacent freq. Kit only $78.
VHF&UHFLINEAR AMPLIFIERS, Use on either FM or SS B. Power levels from 1 0 to 45 Watts to go with exciters & xmtg converters. Several models. Kits from $78.
A1 6 RF TIGHT BOX Deep drawn alum, case with tight cover and no seams. 7x8x2 inches. Designed especially for repeaters, S20.
ACCESSORIES
mh
4* 44 ^
HELICAL RESONATOR FILTERS available separately on pcb w/connector$.
HRF-144 for 143-150 MHz $38 HRF-220 for 21 3-233 MHz $38 HRF-432 for 420-450 MHz $48
COR '2 KIT With audio mtxer, focal speaker amplifier, tail & time-out timers. Only S38.
COR-3 KIT as above* bul with "courtesy beep'. Only $58.
CWIO KITS 158 bits, ffeld programmable, clean audio, rugged TTL logic- Kit only S6S.
DTMF DECODER/CONTROLLER KITS. Control 2 separate on/off functions with touchtones', e.g., fepeater and aulopatch. Use with main or aux. receiver or with Auto- patch. Only S90
AUTOPATCH KITS. Provide repeater aulo- patch, reverse patch, phone line remote control of repeater, secondary control via repeater receiver Many other features. Only $90. Requires DTMF Module*
NEW - SIMPLEX AUTOPATCH
Use with any transceivef. System includes DTMF & Autopatch modules above and new Timing module to provide simplex autopatch and reverse autopatch. Complete patch system only S200/kiL Call or write fordetails.
NEW LOW-NOISE PREAMPS RECEIVING CONVERTERS TRANSMIT CONVERTERS
; Hamtronics Breaks the Price Barrier!
NoNeedtoPay$80toS12S for a GaAs FET Preamp.
FEATURES:
• Very Low Noise: 0.7 dS VHP, 0.6 dB UHF
• High Gain: 1 6 to 28 dB, Depending on Freq.
• Wide Dynamic Range for Overload Resistance
• Latest Duai^gate QaAs FET, Stable Over Wide Range of Conditions
• Rugged, Diode*protected Transistors
• Easy to Tune
• Operates on Standard 1 2 to 14 Vdc Supply
• Can be Tower Mounted
Models to cover every practical rf S if range to ffsten to SSB. FM, ATV, etc. NF = 2 dB or less.
|
MODEL |
TUNES lANGE |
PRICE |
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Kit wjth Case $49 |
|||
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LNG-28 |
26-30 MHz |
$49 |
Less Case $39 |
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LNG-50 |
46-56 MHz |
$49 |
Wired $69 |
|
LNG-144 |
137-150 MHz |
$49 |
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LNG'220 |
210^230 MHz |
$49 |
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LNG-432 |
400-470 MHz |
$49 |
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LNG-40 |
30-46 MHz |
$64 |
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LNG-1 60 |
150^172 MHz |
S64 |
VHF MODELS
Antenna Input Range
26-32
5Q-52
60-54 144-146 145-147 1 44-1 44,4 146-1 4S 144-148 320-223 220-224 222-226 220-224 222-224
Receiver Output
144-14S 2Q-30
144-146 2S-30 28-30
27-27.4 2830 50-54 26-30
144-14S
144-148 50-54 28-30
ECONOMY PREAMPS
Our traditional preamps, proven in years of sen/ice. Over 20,000 In use throughout the world. Tuneable over narrow range. Specify exact freq. band needed Gain 16-20 dB. NF = 2 dB or fess. VHF units available 27 to 300 MHz- UHF units available 300 to 650 MHz.
P30K, VHF Kit fess case P30W, VHF Wired/Tested P432K, UHF Kit less case P432W, UHF Wired/Tested
$18 $33 $21 $36
UHF MODELS
Kit with Case $59 Less Case $49 Wfred $75
432-434 435-437 432-436 432-436 439.26
23-30
28-30
144^143
50-64
SCANISf ER CONVERTERS Copy 72-76, 1 35- 1 44^ 240^270, 400-420, or 806-894 MHz bands on any scanner. Wired/tested Onfy $88.
HELICAL RESONATOR PREAMPS
SAVE A BUNDLE ON VHF FM TRANSCEIVERS!
FM-5 PC Board Kit - ONLY $1 78
complete with controls, heatsinl^, etc.
10 Watts, 5 Channels, for 2M or 220 MHz.
Our lab has developed a new line of low-noise receiver preamps with helical resonator filters built in. The combination of a low noise amplifier and the sharp selectivity of a 3 or 4 section helical resonator provides increased sensitivity while reducing intermod and cross-band inter- ference in criticaf applications. See selectivity curves at right Gain = approx,1 2 dB.
Model
HRA-144 HRA-220 HRA'432 HRA-( ) HRA-( )
Tuning Range
143-150 MHz 213-233 MHz 420-450 MHz 150''174IVlHz 450-470 MHz
Price
$49 $49 $59 $69 $79
While suppiy lasts, get $60 cabinet kit free when you buy an FM-5 Transceiver kit. Where else can you get a complete transceiver for only $178
For SSB, CW, ATV, FM, etc. Why pay big bucks for a muJti mode rig for each band? Can be I i n ke d vi:i t h rece i ve co n ve rte rs f or t ra nscei ve . 2 Watts output vhf, 1 Watt uhf.
For VHF
Modei XV2 Kit $79 Wired S 149 (Specify band)
Exciter Input Range
28-30
28-22
28-30 27-27.4
28-30
60-54 144-146
50-54 144-146
Antenna
Output
144-146 145-146
50-52 144-144,4
220-222*
220-224
50-52
144-148 28-30
For UHF, Model XV4 Kit $99 Wired $169
23-30 28-30
50-54
61.26
144-148
432-434 435-437 432-436 439.25 432-436*
*Add $20 for 2M mput
VHF & UHF LINEAR AMPLIFIERS, Use with above. Power levels from 10 to 45 Watts Several mode is, kits from $78.
LOOK AT THESE ATTRACTIVE CURVESI
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Typ'fcaf Seiectivfty Curves
of Rec&ivers &ncf
Heiicai R&sonstors^
IMPORTANT REASONS WHY YOU SHOULD BUY FROM THE VALUE LEADER:
1. Largest selection of vhf and uhf kits in the world.
2. Exceptfonaf quaffty and fow prices due to large volume.
3. Fa St delivery; most Hits shipped s^me day.
4. Complete^ professionai instruction manuals.
5. Prompt factory service available and free phone consultation.
6. in business 21 years.
7. Sell more repeater modules than stlt Other mfrs. and have for years. Can give quality features for much tower cost.
Call or Write for FREE CATALOG
(Send $1 .00 or 4 iRC'c for overseas mailing) Order by phone ormail • Add$3S&H per order (Electronic answering service evenings & weeicends) Use VISA, MASTERCARD, Checic, or UPS COD.
ronics, inc.
65-D MOUL RD. • HILTON NY 14468 Phone: 716-392-9430
Hamtronics '^ is a registered trademark
See List of Advertisers on page 98
73 Magazine • October, 1984 111
DEALER DIRECTORY
Culver Cib CA Livonia MI
Jiui'5 Electronics* 3919 Sepulveda Blvd.. Culver Complete pbnttn d ta iu systeins, Anittteur rudio,
City C A 90230, 390^003, Tradis 463 188^ San repeater, satellite, and eompuler applicatjonsl
Diego, 827 5732 (Rervo NV). Call Paul \lTS8AHO. Encon Ftiotovoltaics,
, 27GO0 SchiMJcmfi Hrtad, Uvmin Ml 4*150,
FonLuis CA
523.1S50.
Lincoln NE
Cojinptetfi lines ICOM. DenTron. Ten-Tec,
Mirajie, CLibic. Liirietr, over 40(K) eliPs-^iroiiic
products for hobbyist, technician. ejtper[ ^^^ GrMnmunicfttiims is a full Uiw distributor
tiHuitCT- Also CB radio, landinobile. FoiitAna *>^ major-iini- amateur t^iufpnient and atK^siw*-
Eiettroiiitif, (S6SS Siena Ave,. Fontana CA ^^^ antennas, and evtrythirtj^ 4230 Vrtigti^vif
&2335, S23''771ill^ Ave., LineoLn NE £i8S04» 4€'RAD10.
San Jose CA
Bay flPftfl'i n*wt^ amateur radic> store. Ne^ & used autateur fadio iaies & sotvIm. We feShiTP KenwuKjd. ICOM, Azden. Yaesit. Ten- Tec, Santet flc many niott!, Sligvtr Raditi^ Int., 1775 A S. WiTidiestei Blvd., Campbell CA
New Castle DE
Factdrj' Ajthori^od DbhIctI Yaesu., [COM, Ten- Tec,. KBK, Kenwood^ AEA, ICftiitn>i]k5, Santec. Ftill line of accessories. No sales tax in r^elaiitttre. One mile off 1-95, tl^kware Amateur Supply, 71 Meadow Rnad, New Castle DE 19720, 3S*-Tr2S.
Boise ID
Eockj Mountain area s newest ha.mi de-aler. Ca3l RJM first for AEA, A^d^n, KDK. Ten-Tec, But- ternut ^ Cuihcraft, and moire!' ftjM Eloettt>nic5j 4204 Overland, Boise ID 83705. 343-4018,
Preston ID
BosJ WhlBYZ has the largest stock of amateur gear in th* lnl:€;nmE.n,jrtain H'est and the best prices. Call me lor all your ham needs. Rosa Distributing, 1& So. State, Freston ID S3263, SS2-0S30.
Littleton MA
The rcljabk- ham store serving NE. Full line of [COM & Kenwood. Yafrvii HTs, Drake. Daiwa. B&W accessories, Curlis ^ True ktrVKr.*;. LiTSicni^ t lustier, Tel es^Hy -Cain products. Mirage ani|):£r, Astrun P.S., Alpha Delia proleciors^ ARRL & KantrOnics instrucitiDn aids, Whistler radar deitseioti. Full line of doax fitting^, TEL— COM Elocir^nk Cammiinications, 675 Great Bd. (Rt. IIEIJ, Littleton MA 01460, 4«&^'tO0/aMO.
DeriyNH
Serving the ham community' with new and used <rt|iiip[)i:c:f[]t. Wa .stuvk and ser^'"ice most major lines; AEA, Astron, Aaden, RBtW, CushcraFl, Hy-Cain, Hustler, ICGM, Kenwood, KLM, Larsen, Miragif, Moslty; boob, M>toi^, <:*bkf and donnectorSt Business hours 9-7 Monday tb rough Thuffiday, arad 9-5 Friday and Satnr- day, Rivcndell, ^ WarflMr Hill ttoftd, Derry NH 030QS; 434^371,
Albany, New York UPSTATE NEW YORK
Kenwood, iCOM, Ten-Tec^ Belden, Cushcraft, Larsen, HiistJw. AHfiL. Hy^ain, B&W. MF); Mirage, New and ii^ rtiuipiiimit. StJrt'Ing tlw amateur communit)' since 1942. Adirondack Electronjcs, tiK.^ li^l Central Avenue^ Albany NY 12205, 456-0203 (one mile wiMtMNorthway
Cqlimibu^ OH
The biggjest and best ham ^tore in the Midwest featUJiflg Kenwood and other quDlit>' products with work Eng display.^ ■ Wp ^\] only thel'ust. Au- thorized Kenwood service. Universal Amateur Badio, Inc., 12S0 Aida Or,, Reynoldsburg (Co- lumbus) OH 43D6S, $e6-l^67.
Dallas TX
IBM PC'XT kits, supplifis, cvpani^ion prod- uctsi video restorer kits for pay TV\ CATV, iiatcHHEr bi:ibb>-ists' electronic project kits/app- notes. More ihan 9OO0 parte in ,tHH;t; s^-^jujtOEi- ductorsj [Cs, disjcretes, video accessories, tOoh, audio, automotive, cabinets, computer peripberals, Pieoise write for your free ■6&-page catalog: Sabet Electronics, 13650 Floyd Rd., Sie. LU, D^lfls TX 75243; 7S3 4t>5« ffnrmerU I.E.^.
DEALERS
Your company name and message can contain up to 25 words for m little as $150 yearly (preimid), or ?15 per month {prepaid quarterly) . No mention of mail-order business Of area code permitted. Directory text and [payment must reach us 60 days in ad vartce of publication. For example, advertising for the December '84 issue must be in our hands by Octol>er 1st. Mail to 73 Maga^ine^ Peterborough NH 03458. ATTN: Nancy Giampa.
PROPAGATION
Jim Gray W1KU 73 Staff
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40 A |
■■■.OA |
40 |
20 |
20A |
ISA |
ISA |
i5A |
||
|
PfllLlPPlNES |
15 |
2D |
40 |
40 |
20 |
iO |
||||||
|
PUEHTQ RICO |
20 |
20 |
40A |
40A |
40 |
20 |
20A |
feSA |
]5a |
1.3 a |
||
|
SOUTH AFf^lCA |
20 |
30 |
20 |
IS |
20 |
20 |
||||||
|
U. S. S. R. |
40 |
40 |
30A |
15A |
10 |
20 |
20 |
|||||
|
EAST COASr |
L^JA |
20 |
40 |
iO |
40 |
40 |
40 |
20 |
15 |
I5A |
15A |
i5A |
A = Next higher frequency band may also be usef oU B= Difficult circuit this period
G = Good, F = Fair, P = Poor. * = Chance of solar flares- # = Chance of aurora.
|
__^ |
^1 |
|||||
|
UC- 1 C3BFR |
||||||
|
SUN MON rue |
WbU |
THU FRI SAT |
||||
|
1 P/F |
2 p |
3 P/F |
4 F |
5 F |
6 G |
|
|
7 FIG |
a F |
9 p |
10 p |
ri p |
12 p |
13 P/F |
|
14 F |
15 F/G |
16 P/F |
17 p |
18 P/F |
19 G |
20 P/F |
|
21 P/F |
22 G |
23 F/G |
24 P/F |
?5 G |
26 G |
27 G |
|
28 F/G |
29 F |
30 G |
31 G |
112 73 Magazine • October, 1984
I
THE FIRST NAME IN ELECTRONIC TEST GEAR
20 MHz DUAL TRACE OSCILLOSCOPE
Unsurpasaed qualKy at an unbeelable pnce, the Ramsey oseillc?- scoptf compares to olhers coating hundreds more. Features include fELCompofifinl testing circiu.it far resisl^r, cap&cHQf, digttal circui:t and diOde l^s-trng. * TV video syfic fin^r • wide banOiw^dth ^ iT^gh s*nsj- tsvKy • intej-nal graticule • iront panel irace rotator • 2axis • high BensitivHy K-y mode • regulated power supp^y ■ bmat-in ceiibralor * roclt soHd Iriggerjng
$39995
high qiuMly hook on pTDlMfi Included
• .. in* *•
45 MHz DUAL SWEEP OSCILLOSCOPE
Tl>e Ramsey 525 is e dual time bese, delavM 3we«p unit that mctu0esa byph-m Si^naf deftly lino Itf p^ifirLil ■C^ear vleMwingflurimg uery jh^n nse limej^f higti f'e- C]U6tricy wavBiurms. DCh&r leaH^res i^ciu'de. vanabi* iirig^er hoidolf * 20cgii- brai^d &vj-eBp1ifTie rangeiiromO.Ss/dfvloa.SuS/'-div • iunyadii^stabl^ sweep lime • X& sweep magnilicaiion • 1'ive I rigger sources ■ CHT, Ch2. LINE B')(jBfr\B\ end iNTarnai fV niode) " ifOril jjanel x-y O0«ralion. £ a!c«5 irput ■ surn <Jlffer- enca gf CH1, and CH2 wBvefurmEdispldyvd a&aFrt>gi« !<a.ce • sw§ep.g0i:e ai^d
$79995
hJIgh quel \tf h&ok on pmbflft )rvc3uded
RAMSEY D-nOO , VDM MUirrTESTER
Com pact and reliable, desjgned to service a wlaa vari^ily of equipment ipftalurss loclude * mirror back scale * double- jeweled precision motfjng coil * doufaSQ overload pro- letiiori • an id^ai low cost unit for (he b^eg inner orag fi spftre b5tk-up unit.
»1995
te&l teads and batter;/ included
NEW RAMSEY 1200 ran MULTITESTER
Check iransfsnors. -diodes and LEDs wjtri this professsoriai qua Illy meter. Olher features include; decibel scaJ^ * 2QK volt metermg sy^iem • 3'^" mirroreo scale * pofariiy switch • 2D measuring ranges • safety pfobes • high impact piastic ca$e
$2495
Ie9t leadQ dnd tMllery included
RAMSEY D>3I00 DIGITAL MULTIMETER
Rol Fable, accurate digital mea- Syremanls at an am&zingly Sow coat • in-line color coded push buttons, speeds range selection » ab-s pJastbC tilt siand • recessed input jacks • overload protection on all ranges • 3:^ digit UCD dis- p\B.Y with au 10 zero, aulo polarity 8t \o* BAT indicator
$4995
t«Bl l«ads and b^tterv included
■ ■■;»•:- ;-v:^^j^<!W^
CT-7a 7 OIGIT 525 MHz COUNTER
Lab qi>aJity at a breaklhrough price. Featureg • 3 frequency ranges eec^i wiih pre amp * duaS selectable gaiA times • gate acttvily iridicator » 50m ^ @ 1&D MH2 typical sensitivity • wide Irequency range • 1 ppm accuracy
$11995
CT-70I<H
BP-4 nicad pacJ(. . , ,
vw^r«d includes AC a^lapier
. .ft.95
CT-ffil 9 DIGIT 600 MHz COUNTER
The rnos5 wsrsaliFe for less: than S3oO. Features -3 selectable gate limes • 9 dignts ■ gate indicalor
• display hold • ?5mV Cq^ 150 IVIHz typical aem- ■sitiviiy ' to MH£ timetsase for WWV caiibratJOJi
* 1 ppm a;CCora,cy
$1499$
CT-9a ki( ,,.,,.
OV-1 0.1 PPM oven limebase BP-4 n lead pack
wired includes AC adapter
t129.9& . , . 59.3B
CT-125 9D[GIT1.2GHz CQUNIEfl
A 9 digit counter that will outperform unils cost-^ Ing hurtcsreds more. • gate ino^catqr • 24mV @ 150 MHz lypical sensifivily • 9 digit display • 1 ppm accuracy * dispfay hold • dual inputs with preamps
*1 6995
wired Includes AC adapter
BP-4 nicad pack S.9S
, .;jM..... .■..*>-*M^
• •
ivtivn lEiiMi lU^
CT-50 8 DIGIT GOO MHz COUNTER
A vefSatile tab bench counter with optional receive frequency adiapter. which turns the CT- SO Into a digiial readout for most any receiver • £5 mV (3 150 MHz typFcal sensilt^v^^y • B digit diSpJay • 1 ppm accuracy
$1699$
wlr*d
CT-50 kit $139.9S
R A-l receiyer adapter kit .*.,...,.»....,, . 14.95
DM-700 DIGITAL MULTIIViETER
Professional quaiiiy 31 a lobbyist price. Fea- tures include ^S different ranges and 5 lunc- lions • 3'/i digit. '/.■ inch LED display * aulo- matic decimal placatnont * automsillc iSOlarily
«1 1 995
DM'700ki! ,
y p- 1 pi^oba &&I . . - .
wired includes AC adapter
»9a.35
. ,.4.£IS
ihni' -iflK-f' i ■■■» ^-F 1 ■ "I '■ "■
_.r^ ^
; k\;w£.^
riitti^ «ii«iur itt^
HI — 'w^.v
PS-2 AUDIO MULTIPLIER
Tbe PS'^ is handy for high resolujion audio resoluti^on meaisuremenis, multiplies UP in Ire- Ouency • great for PL lone measurements • mu Hi plies by 10 Or lOO » DOl Hz i*"(isoiuli.on & built-iin stgnal pieamp/coniditiOMer
PR-2 COUNTER PREAMP
The PR-5 is ideal for measuring weak signals from to to 1,000 MHz* flat £5 dbgain * BNC connecldr& • great for shifting Rf • hdea] receiver/TV preamp
PS-IB GOO MHz PRESCALER
Extends the range of your present counter to 800 MHz * 2 stage prsamp * divide liy 10 cir- cuitry • sensiliviiy; ?5mv @' i&Q MH; ■ BNC connectors • drives any counter
94995
$4495
Mrir^d
wired includes AC adapter
PR-2 kit «34,9*
$5995
wlr^ Includes AC aidaipler
PS-1 13 kii „ S49.9S
PE-2 k»t
S39.95
ACCESSORIES FOR RAMSEY COUNTERS
Telescopic whip antenna — BNC plug .. $ 8.95 High impedance probe, light loading . , . 16.95
Low pass probe, audio use 16.95
Direct probe, general purpose use , , . . , 13.95 Tilt bail, tor CT-70, 90, 125 . 3.95
Mai^c-iGiEia'a .
PHONE ORDERS CALL
716-586-3950
TELEX 466735 RAMSEY CI
TERMS: • satisfacifon guaranleed • examine (or 10 days: if not ptea$Qd. ratun Ir Drf§iniJ TDrni tar relund • add 6% iw shipping and insufance Iq a maximum of S10.0Q * overseas add \b% for surface m\\ * C DO add $2.50 |C00 in USA cmlyl ■ orders under $T^. DO add $LSO • NV residents add 7%S3Je&t»x • 90 day paris warraniv on ali kits ■ 1 ve^r parts & labor warranty on alf wired units.
I = = = =^=;== I RAMSEY ELECTRONICS JKC,
Penf ield. N.Y, 14626 ^ 268
See Ust of Advertisers on page 98
73 Magazine • October, 1984 113
What To Look For In A Phone Patch
The bpsi way to decide what patch is right for you is to (^fst decide u/hat a patch should do. A patch should:
• Give compIt?t<? contTol lo the mobi(e« aJlowhig fuH break in operation,
• Not tntetfere wfth the normal operation uf your base station. It should not require ycMJ lo con* nect and disconnect cab- les {CM^ Rfp sup'itches!} eif&y time you wish to use your radio as a nor- mal ba^e station,
• Not depend on volume or squelch settings of your radio. Ii should work the same regardless of what you do urlth these con^ trols.
• You should be able to hear your base station speaker uith the patch installed . Remember, you have a base station be^ cause there are mobiles. ONE OF THEM MIGHT NEED HELP.
• The patch should have standard features at no exira cost. These should include program- mable Ml restrict (dip switch es)« tone or rotary dialing, programmable patch and activity timers, and front panel indicators of channel and patch s^tatus.
ONLY SMART PATCH HAS ALL OF THE ABOVE^
Now Mobile Operators Can Enjoy An Affordable Personal Phone Patch. - ,
• Wjthuui an expensive repeater.
■ Using any FM tranceiver as a base station.
• The secret is a SIMPLEX autopaich. The SMART PATCH,
SMART PATCH Is Easy To Install
To install SMART PATCH. connect the multicolored computer stvl^ ribbon cable lo niic audio, receiver discriniinator^ PTT, and power. A modular phone cord Is provided lor con- neclion to ymir phone sys- tem- Sound simple? . . *
rris!
I
impie Autopatclf,'\here*s no wait! B^ for VOX circuits to dro|l^ Simply key your transmitter
to take control.
SMART PATCH is all you need to turn your base station into a per- sonal aufopatch. SMART PATCH uses the only operating system that gives the mobile eomplete control. Full break-iti capability al- lows the mobile user to actually Interrupt the telephone party, SMART PATCH does not interfere wfth the normal use of your base station, SMART PATCH works well with any FM transceiver and pro- vides switch selectable tone or rotary dialing, toll restrict, programmable control cades, CW ID and much more.
To Take CONTROL with Smart Patch - Call 800-327-9956 Ext. 101 today.
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Comniuiiicatjons Electronics Specialties, Inc.
RO, Box 2930, Winler Park. Florida 32790
Teli^hone: (305) 6454M74 Or caU loU-free (800)527-9956
How To Use SMART PATCH
Ptatring a call is stmpl Send your access coc from your mobile {exan pie; '73). This brings u the Patch atid i/oit w h€ar dial tone irati*»miit« from your has* ^taiio* Since SMART PATCH checking aboul once pc second to s^e if you wat to diaJ, all you hav« to d is key your transmitie then dial the phone tiun ber. You will now hei the phone ring and sonu one answer. Since the ei hanc^ control system « SMART PATCH is cot stantly checking to see yoii wish to talk* you ne«- to simply key your iran^ miner and then talk That's right* you simp I key your transmitter I interrupt the phtint^ II m The base station autc mattcalty slops Iransmji ting aher you key you mic. SMART PATCH doe not require any specif tone equipment to contrc your base statiofi. It sam pics very high firequenc noise preset i ai you receivers discriminalor t determine if a mobile i presenJ. No words or syllc bles are ever lost.
SMART PATCH Is All You Need To Automatically Patch Your Base Station To Your Plione Line,
Use SMART PATCH tor.
• Mobile (or remote bast to phone line \ia Simple base, (see fig L)
* Mobile to Mc^bile via Ir terconnected base stci tions for ejctended rang* (see fig. 24
* Telephone line to tnobil (or remote base),
• SMART PATCH use SIMPLEX BASE ST/ TION EQUIPMENT. Us
your ordinaTv base sit tion. SMART PATQ does this without inte fering wiih the normi use of your radio.
WARRANTY?
YES, 180 days of warrar ty protection. You slnipl fan't go witjng. An FCC type accepte croupier is available ft SMART PATCH,
YiV 1*1 K tJ
N
FM
FT-aOdRH
The^lkesu FT-209RH. 5 watts that your batteries can live with.
Have the power you need when you need it with "T&esu's new 5-watl 2-fneter handhetd, Fbwer to get out in situations where ondinary HTs just won't make it
\Afe designed our HT with a unique user- pfDgmmmable fbwer Saver that puts the rig to "sleep" while you're monitoring and "wakes it up** when the squelch bneaks. So you can listen for hours and still have plenty of power to hit those hard-to-reach repeaters when you need to.
With the FT-209RH there's no need to fiddle with knobs when you change from one mennory channel to another Thatis b^use you can inde- pendently stone everything you need in each of the ten memories: receive frequency standard or non-standard offset even tone encod^decode with an optional module. And then recall any channel at the touch of a button.
tt's easy to hear what's happening on your fevorite repeaters or simplex frequencies, just touch a button and scan all memory channels, or selected ones. Or all frequencies between any two adjacent memories. Use the priority feature to nstum automatically to your special frequency when it becomes active.
Bring up control led-access machines with the optional plug-in subaudible tone encoder/ decoder independently pnDgrnmmed from the keyboard for each channel. Listen for tone- encoded signals on seleaed channels— without having to hear a bunch of chatter— by enabling the decode function,
The FT-209RH. which covers 10 MHz for CAP and MARS use, comes complete with a 500-mAh battery charger and soft case.
for those who want a basic radio without Htm bells and whistles, consider the compact, lightweight FT-203R.This economical HT features IS watte of power and an optional DTMF key- pad- Most all the accessories for the 209 work with the 203, including an optional VOX headset that gives you hands-free operation that's perfect for public service events.
So when you visit your d^fer let him know you won't settle for anything but the best A iBdio built by "tSesu.
Hbcsu Electronics Corporation
6851 WkJthaii V% Fkramount CA 90723 (213) 633-400Z
Ibew Cfncinnati Servtoe Center
9070 Gold PsTK Dnve- Hamitton. OH «011 (513) 87+^3100.
■209flH shown aaual size.
Prices and specrfK^clons subjecc to change without notice.
TM-211A DCS... a new turn In 2 meters/70 cm.
I
The TM'211A ? meter and the TM-^411A 70 cm mobiles combine ultra compaci size with the added feature of a 7 position adjustable front panel, allowing you maximum ffexibiiity in both home and automo- t'^ve insta* -i' These compact
irn- . ers also f pr»tyre Kenwood's
^ve DCS (L.y.ial Code ^ rcuit, that allows you
:am your transceiver to re -.,„. J only to transmissions fjoiii stations vwhose radios transmit a pre-selected digital code. Both radios deliver 25 biq watts ol R.F
power on HI and 5 watts (approxj- rnately) on LO power. Dual digital VFO's, built-in, highly visible yellow LED display, five memories plus COMM Channel add to this Impres- sive array of features. The TM'211A and TM-411A e^rh boast high n*"-' formance receivi^ and transmit specifications and an external quality speaker thai provides unsur- passed sound quality. Mounting flexibility is also a feature ^^s, all these features, plus prior ny watch, memory and programmable band scan^ microphone test function, audible "beeper" for operation con- firmation, repeater offset switch and reverse switch. TheTM-211A and
TM-411A oiler you the best in 2 metf^rs and 70 cm opef . is!
Optional accessories:
• CD-10 Call Stgn Die,
• PS- DC. Power Supply
• f'.PS-7A Power Sunnly
• MC-55 Mobrle t^n^iu^hone with Tir'oe-Out Timer
• MA-4 000 Dual Band M Antpnr^a With Duplexef
• S,. .J0^'» SWR/Power meters
• PG'3A i\y*i.e Friter
More information on these prod- ucts IS available from authorized dealers of Tno-Kenwood Communications, mi Wasi vValnut Street. Compton, CA 90220.
CD -10/ DCS
The optional CD -10 ht^ipt, maximize your use of Kenwood's 1 revolutionary new sigr^Hing concept. DCS (Digital Cod'=' ^-"^'elch). DCS use~ -^ - '- " cod" J nation lo opt^w sqij on a receiver thai has been
f programmed to accept the specific code being IransmrUed. Up to 100,000 differenl S-digit codes are possible, allowing each station to have its own "private call" code or
. ■ ■ * L
-U W \m \m^
to respond to a "gfoup caii ui ^'common call" code. Pfogram your call sign (up to 6 digits) in the ASCII code and it is automatically trans- milted when the transmit key is deprer 1 The CD-10 stores the calling station's call sign in its memory
'ere nee. am dtspla. ■] on the L.C.D. readout. The Cb-10 can storp '-all sign data of up to 20 stations, ^^^lowing you to quickly check for cails if you ^^
3ve . 1 absent from your station. and r'^vrr^w your con-^rts for logging purpo^ci. The DCS ' " 'in data transmission system ^ mark and space frequencies with normal
speech band width rrnmpatibte w/most repeaters).
II
^0^
^1*
T?**^^
li-^
TM- 201 A/401 A
The extremely popular TM'201A 2 meter FM (25 watts, 142.0QQ to 149.000 MHz) and the TM-401A 70 cm FM (10 watts, 440-450 MHz) ultra compact mobile transceivers are also available.