February 1982 $2.9S
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Also:
Solving the Bobtail Riddle Requiem for Major Armstro
4 70
ICOMs GoAiTyvvliere HF Rig for Everyone's Fbcketbook
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Unique tuning speed selection for quick and precise QSY,
choice of 1 KHz, 100 Hz or 10 Hz tuning.
Electronic dial lock, deactivates tuning knob for lock on.
Slay on frequeno' operadon*
One memory per band, for storage of your favorite
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Dual VFO system built in standard at no extra cost.
2D0W PEP input— powerful punch on SSB/CW (40 W out,
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Recover preamp built-in • VOX built-in
Noise blanker tseledable dme constant) standard
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Amateur band oov^age 10-80M including the new
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Speech processor— built-in, standard (no extra cost)
IF shift slide tuning standard (pass band tuning optional)
Fully solid state for lower current drain
Automatic protection circuit for finals under hi^
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Digital readout • Receives WWW * Selectable AGC
Up/down tuning from optional microphone
Handheld microphone standard (no extra cost)
Optional mobile mount available
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73Magaztne • February, 1982 3
INFO
Manuscripts
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Antenna Baiuns
Model PB M4.g5
350 watts PEP. 1 .7 to 30 MHz. Low cost. High performance. Just right for transceivers. Specify desired ratio from table below:
|
Mod«l |
Ratio |
Matches 50 ohms to |
|
PB*1 |
1:1 |
50 ohms |
|
PB-1 5 |
1.5:1 |
75 ohms j |
|
PB-2 1 |
2:1 |
100 ohms |
|
PB-3 |
3:1 |
1 50 ohms |
|
PB-4 |
4M |
200 ohms |
|
PB-5 |
5:1 |
250 ohms |
|
PB'6 |
6:1 |
300 ohms |
|
PB-7.5 |
7.5:1 |
375 ohrns |
|
PB-9 |
9:1 |
450 ohms i |
|
PB-1 2 |
12:1 |
600 ohms |
|
PB-1 6 |
16:1 |
' 800 ohms 1 |
Model 1K $32.50
1 Kw CW, 3Kw PEP input. 1:1 or 4;1
2 Kw CW, 6 Kw PEP input. 1:1 or 4:1
Beam Balun $57.50
2 Kw CWp 6 Kw PEP input, 1 :1 or 4:1
\
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4 73 Magazine • Februarv* 1992
The Fun-Oscillator
— a simple, goof-proof vfo for your QRP transmitter.. „„.,WA9RBR
Build this Afitennalyzer
—you'll need a weekend
12
...WIBG 16
hb. 82
MAGAZINE
The Father of FM
— the tragic story of Major E, H. Armstrong , , Hammond
The Art of Listening
—audio accessories explored ...W8FX
A Dish Antenna Anyone Can Build
— no hyperbole, just a parabola
W8DIY
h4itoft*'4
50
64
68
Police Freqs for the TR-2400
—a sleepless night for the mod squad
Those Amazing Bobtails
—the current-fed connection W1XU
Shoot the Moon!
—visual tracking for your EME array
W9CCA
CQ MARS de IC-2A
— work new worlds............. .,
26
30
34
WDSJLW 46
^b's Own LNA
— rolling your own takes patience
..,. , WA4CVP, WA40SR 92
Microwave Master
—you might not need a
mountaintop. ...... ................WB4APC 96
CW Interface
[3 -^let your computer do the copying
W9fD 104
Never Say Die — 6, Social Events — 48, OSCAR Orbits — 83, Ham Help — 98, 122, 139, Reader Service — 114, Review — 118, Letters— 120, Fun! — 123, Awards — 1 25, Kahaner Report — 127, Contests— 128, RTTY Loop — 134, New Products— 135, Propagation — 178
Cover Pastel lliustration by Wiltiam Geise, Wrfton NH.
J
73 Magazine • February, 1982 5
W2NSD/1
KEVER SAY DIE
ec/itor/a/ by Wayne Green
NOW, THE GOOD NEWS
The easy passage of the Gold- water ham bilt through the Seiv ate was certainly good news. . « and will bring closer some badly needed changes In the funda- mental rules by which the FCC has had to operate.
Another bright spot was a bill entered m the House (in Novem- ber) by Rep, Timothy Wirth of Colorado. Let me gtve you quotes on some ol the provi- sions of this bill. . .
Authorize use of smaieur volunteers for examiRation prdparation
Section 44f> is amend©<i by adding at the end thereol the (ol lowing new subsections:
"4{f){A) Noiw I 111 standing Ihe provi- sions of Part III of Title 5, United States Code or 31 U.S.C, 5665(b). for purposes of administering any exam- tion for an amateur station operator license, the Commission may accept and employ the voluntary and un- compensated services ot any indlvld- yai who holds an amateur station op- efalor license of an equal or higher Class than the class license for vvhich the examination is bemg pre- pared. Any person vwho provides ser- vices under this paragraph shall not be considered, by reason of having provided such sen/ices, a Fedeiai employee for any purpose.**
Explanation
This proposal would provide a stat- utory basis for present practice at the Commission, and would allow ex- panslon m the Commission's use of volunteers. The amendment would have no discernible effect on our budgeta ly req u i re me n t s.
''Mf%5} Notwithstanding the provi- sions of Part III ol Title 5, United States Code or 31 U.S.C. §665(b), for purposes of administering any exam- ination for any amateur station oper- ator license, the Commission may accept and employ the voltjntarv and uncompensated services of any indt- vidua! who holds an amateur station operator license of an equal or higher
€ 73 Magazine • February, 1982
class than the class license for which the examination is being con- ducted. Any person who provides vol- untary and uncompensated services under this paragraph shall not be considered, by reason ot having pro-
vided such services, a Federal effV ployee for any purpose."
Expf a nation
The present practice of the Com^ mission is to permit volunteer licens*
$$ HOME-BREW CONTEST $$
For some of us, there is no more satisfying experience than designing and building a piece of electronic gear. Now there's a chance for you honne-brewers to receive special recognition for your achievements. It's the 73 Magazine Home-Brew Contest.
Between now and April 1, we1i be looking for articles de- scribing the best home-brew protects in the lar>d for under SI 00. All useful projects will be published in 73, and the cream of the crop wift share $500 in cash prizes. Top prize in the con- test is $250, with $10Q going to the second place project and $50 to each of three honorable mentfons. These prizes are over and above the payment that all authors receive for hav- ing their artictes published in 73,
Contest Rufes
1. All entries must be received by April 1,1982. To enter, write an article describing your best home-brew construction pfo- ject, and submit the article to 73 Magazine. Any construction article received before the April 1 deadline is aulomatically entered in the contest. If you haven't written for 73 before, please send an 5ASE for a copy of our author's guide.
2. The total cost of the project must not exceed Si 00. even if al I parts are puchased new. Be sure to i nclude a detailed parts list, with prices.
3. All parts used In the project must be available to the aver- age radio amateur or electronics experimenter. To be on the safe side, include sources for any unusual components.
4 Projects will be judged by the 73 technical staff on the basis of usefulness, reproducibility, economy of design, and clarity of presentation. The decision of the judges is finaL
5, All projects must be original, i.e., not previously published elsewhere.
6. All rights to articles purchased for publication become the property of 73 Magazine.
Send your entries to:
Home-Brew Contest
73 Magazine
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Winners will be announced in the June^ 1982, issue of 73. Have fun!
ees holding an Amateur Extra^ Ad- vanced, or General Class license who are al least 16 years of age to admin- ister Novice Cfass operator license examinations. The proposed amer>d- rttent would give statutory recoflni- lion to this practice and would allow the Commission to 6)clend tr>6 praCr UcB lo examinations tor other classes, al the discreUon of the Com* mission.
This program would help to corv serve Commissiori resources and ad- ditlonal benefits would result from the fact that applicants would likely be able to take examinations within their communities, as opposed to having to travet to FCC field offices for testing.
Once the FCC has t>een auth- orized to let amateurs prepare and administer exams, we have the path open to set up a system whereby certain clubs might be able to hold classes to teach the needed theory, rules, and opera- tion skills to prospective hams. . .followed by oral exams and a demonstration of skills.
While there are some ama- teurs who believe that the ten- sion and panic of an FCC-ad- ministered exam are beneficial in some way, that was not my experience... nor the experi- ence of anyone Tve talked with about it. There seems to be a general concept that we should do everything possible to keep enthusiastic people out of the hobby rather than doing all we can to interest people In it. , , and making their entry an enjoy- able experience,
There seems to be some wari- ness that we will suddenly find ourselves with a system where we are bringing in people who will be rotten hams and thus spoil the hobby. I wouid say two things to those worriers . . . first, we already have a fine system for bringing in lousy hams, one which has been working with a high degree of perfection. On© has only to visit Los Angeles to get the full flavor of the I980s-type ham in full bloom. It should be obvious that the present system of filtering out the weirdos is not working worth beans.
Secondly, t know of no one in- terested in opening the flood gates to CBers to come into am- ateur radio for a tree ride. Not even CBers have suggested any- thing that preposterous, I do hear hams opposing it, but these chaps are merely lighting their own straw man, not any* thing ever seriously proposed. If some hams are gullible enough to get excited over such ma-
■jii,rt»#J»*B*fM****
HI AM
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wwti n-eocD
low hear
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igital display/ front ipeakeiv easy tuning
[he R-eOO is a high performance, general coverage iommunications receiver fevering 150 kHz to 30 MHz 30 bandSt at an affordable ^rice. Use of PLL synthesized cifcyitry provides high accuracy of frequency with maximum ease of operation.
R-600 FEATURES:
• 160 KHz to 30 MHz continuous coverage, AM, SSB, or CW.
• 30 bands, each 1 MHz wide» for easier tuning.
• Five digit frequency display, with 1 KHz resolution.
• 6 kHz IF filter for AM (wide), and 2.7 kHz filter for SSB, CW and AM {narrow).
• Up'conversion PLL circuit.
for improved sensitivity, selectivity, and stability. Communicatrons type noise blanker eliminates "pulse- type" nofse.
IRF Attenuator allows 20 dB attenuation of strong signals Tone control Front mounted speaker. "^S" meter, with 1 to 5 SINPO scale, plus conventional "S" meter scale. Coaxial, and wire antenna
Digital world clock with two 24-hour displays, quartz time base
The HC-10 digital world clock with dual 24*hour display shows local time and the time in 10 preprogrammed plus two programmable time zones.
terminals for low impedance (50 0), Wire terminals for high impedance (500 Q).
• 100. 120, 220, and 240 VAC, 50/60 Hz. Selector switch on rear panel.
• Optional 13,8 VDC operation, using DCK-1 cable kit,
• Other features: carrying handle, - S headphone jack, and record jack.
OPTIONAL ACCESSORIES:
• DCK 1 DC Cable kit
• SP-100 External Speaker.
R-iaao
^ear there and everywhereT.. easy tunings digital display
The R-1000 is an amazingly easy-to-operate, high- performance, communications receiver, covering 200 kHz to 30 MHz in 30 bands. This PLL synthesized receiver features a digital frequency display and analog dial plus a quartz digital clock and timer.
R-1000 FEATURES:
* Covers 200 kHz to 30 MHz continuously.
30 bands, each 1 MHz wida Five-digit frequency display with 1-kHz resolution and analog diai with precise gear dial mechanism.
BuiltHn 12-hoyr quartz digital clock with timer to turn on radio for scheduled listening or control a recorder througn remote terminal
Step attenuator to prevent overload.
• Three IF filters for optimunn AM, SS8. CW. 12-kHz and 6 -kHz (adaptable lo 6-kHz and 2.7-kHz) for AM wide and narrow, and 2, 7 -kHz fiiter for high-qualitv SS8 (USB and LSB) and CW receptioa
• Effective noise blanker
• TerminaJ for external lape recorder.
• Tone control
• Built-in 4-inch speaker
« Dimmer switch to controf intensity of S-meter and other panel lights and digital display.
• Wire antenna terminals for 200 kHz to 2 MHz and 2 MHz to 30 MHz. Coax terminal for 2 MHz to 30 MHz.
• Voltage selector for tOO, 120, 220. and 240 VAC. Also adaptable to operate on 13.8 VDC with optionai DCK-1 kil
OPTIONAL ACCESSORIES:
• SP-100 matching external speaker
• HS-6 lightweight, open-air headphone set.
• HS-5 and HS'4 headphones.
• DCK-1 modification kit for 12-VDC operation.
SP-100
R-1000
HS>S
^ ►
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KENVUOOD
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EXECirriVE VfC£ Ff«£SlDiKT
ASSISTANT PUftllBHEIUlDiTOn JefJ D-eTray WB$aTM
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Edward Fermfln WATUFY
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A5ST. MANAGING EDITOR
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CONTfl'»'i^^C: eDlTOHS John - T AG^
Tim OaAi«i NSf^K Urry ftanai)**^ WS2NEt
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neuvers, then we should consid- er them part of the problem, not part of any solutions.
No, I think it is plain to just everyone that our present lic- ensing system stinks. Here we have a Morse code test which a four-year old has passed with flying colors... big deal filter. We have a technical e^am that few people even bother to study for. . . why bother when you can buy the test answers from Bash and just memorize the answers? That Includes questions on rules^ so we don't even have to know them anymore. It Is no wonder that we have jamming of repeaters, foul language on the bands, stupid pileups of DX sta- tions, and a situation on two meters in Los Angeles that has to be heard to be t>el]eved.
Not only are things going to hell in a basket^ but we have the spectacle of thousands of hams doing all they can to protect this terrible system and make sure that we get even more of the same kind of hams.
Yes, I do have some ideas on what to do about the situation. And I think they will work. They certainly are right up the alley of the current FCC changes. The Commission has two major in- terests these days . . . deregula- tion and cutting expenses. I think that we can take advan- tage of these and at the same time improve amateur radio substantially.
Let's take a look at some ba- sics, Firstiy, yes. . . we do have some terrible hams in our ranks. But we recognize that, as much of a pain in Ihe ass as these bums are, they are a distinct mi- nority. Okay . . . there's a hint foi us ... a clue on how to start get* ting out of this miserable situation.
To me, one of the foundations of amateur radio Is the ham club. 1 believe that every ham should belong to and support a ham club. This is one of the big strengths we have. This also is a key to our separating the good from the bad and the ugly, for few of the really bad eggs ever join clubs. The same behavior which makes them despicable on the air keeps them from hav- ing friends off the air. And what few do have the guts to come to club meetings, knowing what others think of them, are not thought well of for it. Thus, \ sus* pect that the more we can in- volve our clubs In the training
and licensing of newcomers, Ihe tietter class of hams we will have on our bands. Perhaps we could even consider some sort of trial period for newcomers t^e- fore their licenses are perma- nent so that we could observe them on the air.
We already know that the most vicious and obnoxious of people are quite capable of learning the code. In fact, since some of the worst hams we have had have been Extra class, per* haps there is some correlation between ugliness and adapt* ability to code (I'm kidding. . . aren't I?). I think that CW is one of the most treasured aspects of amateur radio, but I also think that the ability to copy the code ES meaningless as far as deter- mining whether someone is go- ing to be a good ham. I think that once we make code ability hon- orable and stop forcing people to learn It for the test, we will take a lot more pride in it. Who can really take pride In some- thing which he has to do, whether he wants to or not?
Clubs are an answer to many of our problems. If we are going to get amateur radio into any serious growth pattern we are going to have to have many more and stronger ham clubs, I would like to see ham clubs set up in every high school in the country. Td like to know that every ham club has classes to teach newcomers the theory, the rules, and how to operate. If the Wirth bill goes through. It will open the way for clubs not only to teach the fundamentals of amateur radio, but also to make up and administer the ex- ams. Talk about a service being self-sustaining!
This also would cut the cost to the FCC substantially, I don*t know how much they are paying their people to keep writing new test questions to try to stay ahead of Bash and his cheat- sheets, but it must be a substan- tial amount. Then there ts the cost of printing and distributing the tests. If the field personnel of the Commission did not have to sit around and administer ex* ams they would be freed up for more productive work... or even to go into the private sector and earn money for taxes in* stead of spending It. We sure have a need for engineers and technicians these days in indus- try... a desperate need.
Monitoring
Another provision of the Wlrth bill is as fottows. , ,.
Aiithofko u»« Qf vmatAur volimt*»ci tor ffiontiorlng
'*4(f)^ For purposes of monitonng arty violation of any provision of this Act, and of any regulation made by the Commission pursuant to this Act, felattng to the amateur radio service, the Gommtssion, notwithstanding any provisions of Part III of Title 5, United States Code or 31 U.S.C. § 665(b), may fl) recruit and train any in- dividual licensed by tlie Commission to operate an amateuf station; and (li) accept and employ the voluntary and uncompensateij services of such in- dividual. For purposes of recruiting and training such individual, the Commission may also accept and employ the voluntary and uncompen- sated services of any amateur sta- tion operator organ iiat ion. Any per- son who provides voluntary and urv compensated services under this paragraph shall not be considered, by reason of having provided such services, a Federal employee for any purpose."
Explanation
The volunteers' monitoring author- ity should include the monitoring of amateur licensees transmitting on frequencies not assigned to the ser* vice and i$ intended to permit volun- teers to collect violation reports and annotate arKJ summarize them few the convenience ol the FCC.
Enactment of this proposal would enhance the Commission's enforce- ment efforts and bolster efforts to de- tect and prosecute rule violators. To ensure that a volunteer monitoring program helps rather than hinders the enforcement progi'am, it Is Impor- tant that violation reports undergo preliminary review by volunteer organizations to help FCC personnel cfetennine which alleged violations represent the most promising targets for the Commission's limited en- forcement resources.
This amendrs\ent would not in- crease our budgetary requirements. It may help us to conserve our en- forcement resources or, at least, im- prove the efficiency of our enforce- ment program.
If the Commldsloh Is to fully utilize the services of volunteer amateur llc' ensees for monitoring, as envisioned by this proposal, there should be an exception to Section 605 to permit (he monitoring groups to receive end fiisctose informaUcfi transmitted ty amateur ticensees antS opera tors^ (See proposed amendment to Sec- tioft 60S, infrs.)
Exempt amateur
rodiio communications
ynder certain circumstances
Section 805 is amended by striking
the last sentence thereof and adding
the tohowinQ:
Continued on page 131
0 73Magaiine • February, 1982
/*■
^
^<^
Store
commands,
as well as text,
for automatic execution
The Heathkit /xMatic Memory Keyer's custom microprocessor stores up to 240 characters of
text or commands. Variable-length buffers elim- inate wasted memory space. "Command strings" allow text to be stored in several buffers, then strung together in any sequence for most effi- cient use of memory. Command strings can also select speed, weight, spacing and auto- repea! count.
No external key to buy
Integral capacitive "touch^" paddles unplug and store in their own compartment inside the Keyer when not in use. Left handed? A touch of the key* pad and the paddles are reversed. Choose any speed between 1 and 99 words per minute, and any of 1 1 weight settings. Special rear-panel jack connects mechanical paddle.
Great code practice machine, too
A "practice" mode sends random code groups of random length and selectable types for a total of
Heathkif
6,400 different practice sessrai
Each sequence sends approximately 3,0i
characters before repeating.
Other features:
Built-in sidetone oscillator and speaker have pitch and volume controls. Phone jack and ear- phone are included for private listening. Complete details on the great new ^fvlatic f^emory Keyer are in the latest Heathkit Catalog. Or see It at your nearby Heathkit Electronic Center*
Send for free catalog
Write to Heath Company
Dept. 011-864, Benton Harbor. Ml.
in Canada, coniact Heam Company.
1480 Dundds Slf«6t E . Misstssauga. ONT L4X 2R7.
Visit your Heathkit Store
) Where Heathkit
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Group A |
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67.0 XZ |
91.5 ZZ |
118.8 2B |
156.7 5A |
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71.9 XA |
94.8 ZA |
123.0 3Z |
162.2 5B |
|
74.4 WA |
97.4 ZB |
127.3 3A |
167.9 6Z |
|
77.0 XB |
100.0 IZ |
131.8 3B |
173.8 6A |
|
79.7 SP |
103.5 lA |
136.5 4Z |
179.9 6B |
|
82.5 Y2 |
107.2 IB |
141.3 4A |
186.2 7Z |
|
85.4 YA |
110.9 2Z |
146.2 40 |
192.8 7A |
|
88.5 YB |
114.8 2A |
151.4 5Z |
203.5 Ml |
Frequency accuracy* ± • 1 Hz maximum - 40''C to + 85°C Frequencies to 250 Hz available on special order Continuous tone
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Group B |
||
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TEST- TONES: 600 1000 1500 2175 280S |
TOUCH-TONES: 697 1209 770 1336 852 1477 941 1633 |
BURST-TONES: 1600 1850 2150 24O0 1650 1900 2200 2450 1700 1950 2250 2500 1750 2000 2300 2550 1800 2100 2350 |
• Frequency accuracy, ± 1 Hz maximum - 40X to + 85°C
• Tone length approximately 300ms* May be lengthened, shortened or eliminated by changing value of resistor
Wired and tested: TS-32 $59.95, SS-32 $29.95
COMMUNICATIONS SPECIAUSTS
426 West Taft Avenue, Orange, California 92667 (800)854-0547/ California: (714)998-3021
*^15
Mark Oman WA0RBR 528 De'tnes Court Ft CoUins CO 80525
The Fun-Oscillator
a simple, goof-proof vfo for your QRP transmitter
Hole: A complete kit of parts, mclyding PC board, is available from RAOIOKIT, Box 41 15. Greenville N H 03043 for $34.95 plus $2.50 shipping and handling.
The Fun-Mitter (Febru- ary, 1981, 73) and Fun- Ceiver (|ulv, 1981. 73) pro vided the home-brew-ori- ented amateur with the ba- sic components for a home- brew station setup.
Many amateurs have re-
sponded by saying that they need more frequency f!exj» bility for their Fun-Mitters. The simple vfo described in this article is the result of those requests. It allows greater frequency excur- sions than the simple vxo
Photos by Duane Bertsch
circuit of the Fun-Mitter to provide approximately the same frequency coverage as the companion receiver.
The vfo follows the same guidelines as the two pre- vious articles and should be as easy (or easier) to con-
A Fun-Station!
struct and to get operation- al.
For those unfamiliar with my earlier articles, this series of articles focuses on simple, easy-to-construct, easy-to-operate gear with all parts available from local Radio Shack outlets. Size and appearance of the vfo match the transmitter and receiver to provide a nice looking station pack- age.
Of utmost importance is the fact that no modifica- tions have to be made to the Fun-Mitter to use the vfo. It simply plugs in where the crystal was (unless Copi was installed). This allows for either crystal or vfo operation of the Fun-Mitter Also, it can be constructed for either 40 or 80 meters It provides about 70 kHz of coverage on 40 meters and about 50 kHz on 80.
The Circuit
The vfo should be the most goof -proof of all three pieces of gear as evidenced by the schematic of Fig. 1. The basic frequency-deter- mfning portion of the vfo is identical to the vfo of the
12 ?3Magazine • February J982
m
Internal view of vfo.
Fun-Ceiver. This allows for ease of understanding and construction as well as simi- lar frequency range.
Before I began this series, I developed a set of guide- lines for the items to be de- signed. Based on this crite- rion of setting goals in ad- vance. ! developed the fol- lowing goals for the simple
vfo.
• Good performance [no chirp, minimal draft, clean waveform)
• Simple construction [PC board use, less than four hours total build time, mini- mum parts count}
• Cost — less than $20 with new parts
• Minimal modification to the Fun-Mitter
• Full output from the Purr- Mi tter
• No variable capacitors or inductors
The final version of the vfo meets the above goals.
Only three transistors are used in the vfo, one as the oscillator (Q1), one as a class-A amplifier (Q2X and one as an emitter-follower buffer [Q3]- This final ver- sion of the vfo went through three revisions from the original form. This was necessary to maintain good performance while still keeping things simple. The original design includ- ed only two transistors, but at times chirp was detected
on the transmitted signal The main advantage of the circuit of Fig. 1 is that only one tuned circuit is used (LI). This means modifying only one inductor!
Q1 operates as a parallel- tuned Colpitts oscillator with LI. CRl, CR2, Cr C2, and C3 being the frequen- c y-d etermining compo- nents. The oscillator is tuned by varying the volt- age at the junction of the two diodes. This, in turn, varies the capacitance of the diodes which varies the frequency of the oscillator. LI is a modified Radio Shack 10-|iH rf choke It is modified, as described lat- er, to provide the needed inductance. The last few
Front view of the completed Variable Fun-O^cittator.
turns of the modified choke are spread out over the choke body to provide an easy means of setting the oscillator frequency.
As mentioned in the re- ceiver article, the capaci- tors needed to build a sta- ble vfo are not ea<;ify found at Radio Shack. NPO-type capacitors from a large va- riety pack again are used in parallel and series combi- nations to obtain the need- ed capacitance for CI, C2, and C3. Silver-mica or poly- styrene capacitors will give even better results.
Output from Q1 is taken through a coupling capaci-
tor, C4. This capacitor should be kept as small as possible to isolate the oscil- lator from toad variations which can cause chirp. The capacitor is attached to the next stage, Q2, a class-A amplifier. This amplifier raises the level of the signal to the level needed to drive the Fun-Mitter.
Q2 is direct-coupled to the final stage, Q3, an emit* ter follower. This stage pro- vides excellent isolation be- tween the oscillator and the transmitter as well as pro- viding an impedance match between the two. Without Q3, as in the original design,
CI
Llj
« J I 1 J 1^
f — 1 /A At
C«2
*tav rro fni
4
3900
itl03 220
m
»00^H
m
09
C114
^
iff
f»04
in
4»
F\^ 1, Schematic of vfo.
73 Magazine • February, 1982 13
*kZV (TO Stl
TO L
EXT
CR3
PC layout for vfo.
PC boards for the vfo are avaifable from the author for S7 ppd. PC boards for the previous articles also are available as follows: FunMltter— S7 ppd; Fun>Cftiv0r— $7 ppd; Filter'— $3,50 ppd*
|
Parts List |
Radio Shack |
|
|
Designator |
Value |
Part Number |
|
CI |
200 pF NPO (approx.J |
272 801 |
|
C2.C3 |
4?0pFNPO |
272«I1 |
|
C4 |
10 pF (use two 4,7 in |
|
|
para 1 lei) |
2-272120 |
|
|
C5. C6, C9 |
0-1 mF |
272-135 |
|
C7.C8 |
0.01 hF |
272-131 |
|
CR1 CR4 |
1N914 On 80 meters, for CR1 and CR2, use two 1N9145 in paral el for each (piggybacH) |
276-1122 |
|
J1-J3 |
phono jack |
274-346 |
|
LI 1 |
eOm: Two 273-101 inductors in series: one with no turns removed, one with 10 turns removed 40m: 10 turns removed from 273-101 inductor. For both 80 and 40 m the last 3 turns of the modified inductor should be spread out over rest of the form |
|
|
L2 |
100->iH inductor |
273*102 |
|
Q1 |
FET |
276-2035 |
|
Q2. Q3 |
RS2033 |
276-2033 |
|
R1 |
100k, 1/4-W |
27V1347 |
|
H2 |
10k. 1/4-W |
271 -1335 |
|
R3 |
4Jk, 1/4-W |
271-1330 |
|
R4R6 |
470Q. 1/4^W |
271-1317 |
|
Not or> PC |
||
|
board: |
||
|
Lfixt |
lOO-^H inductor |
273-102 |
|
, R101 |
agk. 1/4-W |
271^1329 |
|
R102 |
10k linear pot |
271-1721 |
|
R103 |
220Q, 1/4'W |
271 1313 |
|
R104, |
||
|
R105 |
Ik. 1/4-W |
271-1321 |
|
S1 |
SPST switch |
275-612 |
|
case |
270-251 |
|
|
knob |
274-392 |
TO JZ tOUTl
Component location.
the vfo is not stable when the transmitter is keyed.
CR4 is used to shift the frequency of the vfo when the transmitter is not in use and you are Mstening to the receiver. It does this by changing the voltage at the junction of CRl and CR2, which shifts the oscillator frequency. Without this feature, the vfo signal would appear on the listen* ing frequency and make lis- tening impossible!
Construction
The construction of the vfo is Intended to be goof- proof. It is built on a 2 ^/4''x 3" single-sided board just as the transmitter and receiver were It cannot be overem- phasized that the circuit should be built on a PC board. Nearly all of the problems that readers had in building the previous two pieces of gear were due to breadboard or point-to- point construction. If you are an inexperienced home- brewer, it is fairly easy to make mistakes when wiring the circuit apart from a printed circuit board.
I built my vfo in an enclo- sure that matches the en- closures used for both the transmitter and receiver. Also, the front-panel layout was made compatible to enhance the appearance of the gear.
As can be seen in the photographs, the tuning
potentiometer (R7) is mounted on the front panel The associated re- sistors and inductor (R6, R8, L3) are also mounted on this potentiometer, and wires run from there to the appro- priate circuit points.
The rear panel contains three jacks. One is for the vfo output signal, and one is for the vfo offset. The connection between the vfo and transmitter should be made with coaxial cable [RC-174or RC'58)
Operation
The vfo is best operated with a battery rather than an ac supply. This elimi- nates any possibility of ac hum on the transmitted sig- nal. It also helps improve frequency stability Two 6-volt lantern batteries m series will power the vfo for a long period of time. If the Fun-Mitter is powered by batteries, the needed 12 volts can be tapped from those batteries.
Tuning and operation are very easy: Only one adjust- ment needs to be made- setting the vfo on frequen- cy. This is accomplished in the same manner as was done in the receiver. Using a separate receiver, listen on the frequency you want the low end of the vfo to be set on (for example, 7100 kHz], Drape a length of wire near the vfo and attach the other end to the receiver
14 73 Magazine • February, 1982
antenna input. With the vfo on and warmed up, slowly spread or compress the last few turns of LI until the vfo signal is heard in the receiv- er. This adjustment should be done with the tuning po- tentiometer (R7) fully counterclockwise. Finally, verify that the vfo covers approximately 70 kHz if built for 40 meters and 50 kHz if built for 80. That's all there is to the adjustment.
To operate the vfo, two connections need to be made— one to the transmit- ter crystal socket and one from the vfo offset input to J 3 of the Fun-Mitter. (This jack was added to provide receiver mute operation for the Fun-Ceiver.)
If Copt w^^ rtot included in the Fun-Mitter, then the vfo signal can be applied di- rectly to the crystal socket terminals (see Fig, 2), If Cgp^ was included, remove its connection and connect that terminal of the crystal
socket to ground. An in- spection of the Fun-Mitter schematic will reveal that even this step is not neces- sary if a method can be de- rived to connect the shield of the vfo cable to ground of the Fun-Mitter, Alterna- tives such as a rear-panel phono connector on the Fun-Mitter also can be used. A plug can be made easily from two Vi'' to Va'' lengths of #12 gauge copper wire. Solder the vfo signal and ground leads to these wires and plug them into the ap- propriate crystal socket pins.
Once the vfo is plugged in and turned on, verify that the transmitter operates as it did before. With the vfo in use and all connections in place, the vfo signal should be heard only when the transmitter is in the transmit mode (due to the vfo offset feature). Zero- beat the vfo with the trans- mitter in the transmit posi-
TO y 3 "
-®-<
I
JACK I I
J3 i
€) I
+ 24V
CRYSTAL SOCKET
H^iJA i^msm
I
fig, 2. Connections between vfo and Fun-Mitter
tion and the key down. Re- member that when using a direct-conversion receiver, you must zero-beat the cor- rect side of the signal you are listening to.
Crystal operation still can be used by simply re- moving the vfo leads and plugging the crystal back in.
It should be possible to use the vfo with low-power solid-state transmitters other than the Fun-Mitter, However, modifications may be necessary to the
transmitter if the oscillator is not configured as in the Fun-Mitter.
Conclusion
The vfo should be simple
to build and goof-proof in its operation. Many more contacts now should be possible due to the ability to move to the frequency the other station is on. This series will be continuing in the months to come with additional goof-proof proj- ects. Meanwhile, enjoy the Variable Fun Oscillator! ■
THE RTTY ANSWER
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Photos by W1GSL
Penn Ciower Wl BC 459 Lowetl Street Andover MA 0131 0
Photo A. Front view of the dummy toad/wattmeter/rf bridge. The resistance dial i$B 2-7/4'' diameter plastic skirt attached to a standard knob.
16 73 Magazine * February, 1982
Here is a weekend proj- ect that combines two instruments and an old technique into a very handy gadget to have around the shack. First, it's an 8-to-IO Watt 52-Ohm dummy load with a calibrated wattme- ter: perfect for tuning up low-power transmitters. Second, it's also a calibrat- ed rf resistance bridge which can make antenna adjustments a lot easier by telling you more about the nature of a mismatch than a plain swr bridge will The old technique provides a nice tie-in between these two instruments and gives some benefits besides: The dummy load is also a resis- tive power divider that pro- vides a low-level driving sig- nal for the rf bridge.
One benefit of this ar- rangement is that the power source sees a load which is essentially independent of the bridge load. That means you can load your QRP transmitter into this instru- ment put that new antenna
on the bridge output, and fool around to your heart's content without risk of damaging the transmitter or even detuning its output stage. In addition, the power delivered to a 50- Ohm load is only about 40 mW when the power com- ing out of the transmitter is 5 Watts. That is a 21 dB reduction, and it means that any signal you radiate while adjusting the antenna is 3-1/2 S-units less than it might have been — certainly a neighborly gesture on to- day's crowded bands.
Background Theory and Circuit Description
There is nothing new or
unique about the circuits described here. Rf resis- tance bridges have been around longer than the more familiar high-power swr bridges and there are several examples in recent publications,^'^ The dummy load/power divider tech- nique was described in Solid State Design for the
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Idle C'Diddle")
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I
HAL COMMUNICATIONS CORP Box 365
Urbana, Illinois 61801 21 7-367-7373
Radio Amateur (ARRL) and recently used in a trans- match tuning circuit de- Scribed in QSTJ
What I hope to empha- size here is this instrument's usefulness as a matching aid, the simple and inexpen- sive nature of the circuit, and the fact that the same circuit can be used as a dummy load with a built-in calibrated wattmeter. Ifs like getting two instruments for the price of one, and the final result is a very handy piece of test gear.
The resistive rf bridge is a simple modification of the classic low-power swr bridge, so before getting down to circuit details let's consider swr bridges in gen- eral for a moment. There are two main types of bridges used for measuring swr, and the most common type is a high-power han- dling circuit meant to be left in the transmission line for continuous monitoring. Usually, this type of bridge requires a minimum of 5 Watts or so driving the load before the meter readings are large enough to inter- pret accurately. This occurs because the bridge itself is very loosely coupled to the transmission line, typically through a few picofarads or several inches of wire run- ning parallel to the center conductor of the main line.
The other type of bridge is inherently a low-power in- strument. The driving signal runs right through the resis- tive elements which make up the bridge, so the bridge itself must be able to ab- sorb a large fraction of the input power. The resistive bridge doesn't find much use in amateur circles be- cause it requires only a Watt or less of drive and can't be left permanently in the line; it's strictly an occasional-use test instru- ment
There is nothing wrong with continuous swr moni-
18 73 Magazine • February, 1982
toring. After all, the familiar deflections of the high- power monitor do give a constant verification that the transmitter is tuned and the antenna connected. The low-power test instrument described here has some advantages over the usual swr bridge, though, espe- cially for initial antenna ad- justments, because it tells you more than just the mag- nitude of a mismatch.
Swr can be defined sever- al ways, and one is the ratio of a load impedance to the transmission line's charac- teristic impedance (which is almost always near 50 Ohms in current amateur usage). For example, to cause a 3:1 swr, a 50Ohm cable could be terminated with either 150 or 16.6 Ohms. These are purely re- sistive loads, but there is also an infinite number of reactive loads which would give the same 3:1 swr, and a common swr bridge can't tell the difference between any of them. You can build a bridge to measure both the reactance and resis- tance present in a load/'^'* but such bridges tend to be too complex for my taste and requirements.
When matching a load to a 50-Ohm line, I generally have two questions. Is it resonant, and what's its re- sistance? If a load is reso- nant (and that's how I want all my antennas to be), then it has no reactive compo- nent—just resistance. If I know the value of that resis- tance, then I know the swr and whether I need more or less resistance to get a match, rll give an example at the end of the article, but right now let's look at the schematic shown in Fig. 1.
There really isn't much to the circuit diagram. The in- put signal is terminated in a 53-Ohm dummy load con- structed with a series-paral- lel resistor assortment. The voltage development across the 10-Ohm portion of that
dummy load drives a sim- ple bridge circuit made up from a 250-Ohm pot, a 51-Ohm standard resistor, and the load impedance. The bridge error signal ap- pears between the output connector and the poten- tiometer arm and is detect- ed by a germanium diode. The result is then indicated by a TOO-uA meter in a volt- meter circuit.
Bridge operation is equally straightforward. When input power is ap- plied to the instrument, it develops a voltage across the 53-Ohm dummy load. About 1/5 of this voltage appears across the 10-Ohm portion of the dummy, and this is the driving voltage for the resistance bridge. Some fraction of this driv- ing voltage shows up be- tween the potentiometer arm and ground, the exact amount depending, of course, on the shaft posi- tion. Similarly, there is some other fraction of the bridge driving voltage ap- pearing across the load ter- minal, this fraction depend- ing on the load resistance connected there.
If there is no load con- nected, then the entire source voltage appears there and well make use of that fact later to calibrate the wattmeter portion of this instrument. If a 51-Ohm load is connected, then ex- actly half the source volt- age will be there. The differ- ence between the output voltage and the potentiom- eter arm voltage is rectified by the diode and drives the meter through the sensi- tivity control, so with the 51-Ohm load the bridge will show a null when the pot travel is exactly centered. Other load resistances will show nulls at other posi- tions and the potentiometer dial may be calibrated by marking the nulls corre- sponding to a whole series of load resistances. In theory, the bridge should
show nulls for every load re- sistance between zero and infinity, but in practice this doesn't happen because the potentiometer isn't infinite- ly adjustable.
The circuit c^n be cali- brated pretty accurately for resistances between 5 Ohms and 1 k, with the best resolution around the center of the dial at 20 to 150 Ohms, Notice that the bridge cannot be nulled completely if the load has a capacitive or inductive component since such a load would introduce a phase shift between the bridge source voltage and the bridge load voltage. As there is no corresponding phase shift between the bridge source voltage and the potentiometer arm volt- age, there never will be a point where the diode volt- age will be zero and the meter nulled, Even when the voltages at each end of the diode are equal in am- plitude, the fact that they are phase-shifted with re- spect to each other guar- antees that there will be a sine wave or error voltage for the diode to rectify. In practice this means that un- less the load is a pure resis- tance there will not be a true null but only a partial dip in the meter reading as the potentiometer shaft is turned,
A true rf impedance bridge would have two null adjustments: one for rf re- sistance and one for reac- tance. With such a bridge you can completely define any mismatch, but, as noted earlier, that's often unnecessary, especially in antenna work where the goal is to tune out reac- tance by resonating the antenna. You can always tell when a load is resonant with the resistance bridge because at resonance the null will be complete. Then steps can be taken if necessary to transform the remaining impedance to match a 50-Ohm line.
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LOAD
SEE TEXT
MET
exER
Fig, t. Schematic diagram of dummy load/wattmeter/rf
bridge. R1 is chosen as necessary to calibrate the wattmeter
This same bridge circuit can be used to measure the power delivered to the dummy load by the trans- mitter, A glance at the schematic will assure yo^J that with no load connected to the bridge and the resis- tance dial set to zero Ohms, the voltmeter circuit will in- dicate the rf voltage across the 10-Ohm portion of the dummy load. Knowing that voltage, we can easily cal- culate the voltage across the whole dummy resis- tance, and knowing that, we can calculate the power there from P = V2/R. The calibration can be accom- plished using only a dc volt- meter and will be described shortly.
Construction
A lot of articles begin their construction descrip- tion with the assurance that "the layout is completely noncritical/' That is certain- ly not true here, but "criti- cal" is also too strong of a word, so let me just caution you to be careful with lay- out. There are three main areas that can cause trou- ble.
First, it's best to arrange the dummy load portion of the circuit so that current flowing in the ground path from the bottom of the dummy load back to the in* put terminal does not share any conductor with part of the bridge circuit. If it does,
20 JSMagazine • February, 1982
then variations in the input power will shift the null po- sitions on the resistance dial. Photo B shows one way to solve that problem by bringing the input power and its ground return to the dummy resistors on a single piece of coax, thus avoiding the temptation to ground the bottom resistors to some point on the chassis.
Second, the detector di- ode should have one end connected directly to the output jack. My first few at- tempts had more compact physical arrangements with the diode connected to the bridge output terminal with lengths of wire or brass strips. This always inter- fered with getting good deep nulls on both ends of the resistance range.
Third, the detector should not be a silicon diode, since the 0.6-volt threshold of a silicon diode will cause the bridge nulls to be too wide. With a given load termination there should be a single, sharp deep null on the dial, not a dead zone covering several degrees of rotation. My col- lection of diodes is pretty large, and the best of the lot turned out to be some ger- manium 1N34 equivalents I paid 10^ each for some 15 years ago! Radio Shack's 276-1123 diodes cost the same today and should work as well.
The dummy load nomi^ nal value is about 51 Ohms with the circuit shown. I used an assortment of resis- tors from the junk box, so feel free to substitute val- ues, but do observe a few simple rules. Wire-wound resistors are definitely out because they look like coils at radio frequencies. Also, stick with carbon resistors having values less than Ik. When paralleling resistors, try to have them all of the same value so they dissi- pate equal amounts of pow- er. Keep the leads short and the wiring direct; this keeps the dummy load looking re- sistive at the higher fre- quencies and prevents stray coupling which might inter- fere with the bridge nulls.
The rest of the physical arrangement is pretty clear from the photographs with the exception of the bridge potentiometer mounting. A similar bridge is described in WeSAI's 1962 Radio Handbook^ and the author there cautions that stray ca- pacitive coupling between the potentiometer resistive element and ground can cause frequency sensitive errors in calibration.
The suggestion made there, and followed here, is to cut a large hole in the box (say, 1-1/2" in diameter) and mount the pot in the center of this open space using a piece of insulating plastic, bakelite sheet, or unplated circuit board for support. This insulates the pot body from ground and thereby greatly reduces the capacitive coupling be- tween the pot resistive ele- ment and ground. It seemed like a good suggestion so I followed it. I can't strictly say it is necessary because I didn't try it the other way, but it sure can't hurt.
The skirt on the resis- tance dial covers the hole from the front of the box. If
you want to use a smaller knob with a pointer, you could mount a rectangle of
insulation over the hole from the front side of the panel and use that to hold the pot and the calibration marks. The actual value of the bridge potentiometer is not too critical It should be at least 50-Ohms so that it doesn't draw too much power, and anything over Ik is probably asking for trouble with stray capaci- tance. If you have anything inside that range, try it before you buy a new 250-Ohm unit.
The box shown is a cut- down Bud minibox that started out as 3"x4"x5^
The 3" height was reduced to just under 2" because it fit the hand better, but there is nothing magic about these dimensions. Use anything of roughly the same size as long as it is made of metal. You also will note in the photographs that BNC connectors are used instead of the more common (in amateur cir- cles, anyway) UHF series. 1 don't run enough power to require RG-fl, and I find the smaller quick*connect BNC connectors more conve- nient for my home-brew projects, Naturally, if all of your antenna cables have UHF connectors, then you also should use them on your bridge.
Calibration
There are two things to calibrate here: the watt- meter and the bridge scale. The meter serves as a null indicator when using the bridge, so the wattmeter calibration can be done after the bridge has been checked out*
The bridge dial can be as simple or fancy as desired but it should be large enough to read easily. The skirt on my dial is 2-1/4" in diameter You probably will want to start with a paper scale and save the fancy artwork until everything is working properly.
Assemble a collection of carbon resistors covering as
many values as possible be- tween 5 and 1 000 Ohms and then Qui the leads to about 1" in length. The leads are bent so the resistors can be spring loaded into contact with the bridge output con- nector. If you have a lot of spare connectors, you also could make up a number of dummy loads with the dif- ferent resistors similar to the one shown next to the bridge in Photo B.
Any layout problems will be more pronounced at the higher frequencies, so fire up a 10-meter rig if you have one and feed several Watts of rf into the bridge.
(I've used this instrumefit only on 10 meters, but it might work all right up to 6
meters.) With the bridge ex- cited, check the nulls at both ends of the range, say, with a 10-Ohm then a 680-Ohm toad.
Both nulls should be deep and well defined. If one isn't as deep as the other, then there is prob- ably something wrong with the physical layout of the bridge elements. Try mov- ing things around some or try another ground routing. If you followed the layout shown, then there really shouldn't be any trouble. Remember that this is an rf resistance bridge and with resistors on the bridge out- put, the nulls theoretically should be right down to zero meter movement In practice, stray reactances prevent the nulls from be* ing perfect but they should come pretty close to it If the load does contain some reactance, there still will be a dip but it won't be to zero as previously mentioned.
When you're satisfied with the basic bridge opera- tion, make a temporary scale and mark off the posi- tions of the nulls due to the collection of sample resis^ tors. Standard resistor val- ues aren't nice round num- bers, but with enough cali- bration marks you can
Photo fi. Interior of the instrument, showing layout and construction details. The obiect in the foreground is a dummy load typical of those used during calibration.
make a final scale with lines at 5, 10, 20, 30, etc.. Ohms as shown on the front panel in Photo A,
The wattmeter scale can be calibrated easily using a dc power supply and a good dc voltmeter. Remem- ber that the wattmeter is ac- tually reading the rf voltage across the lOOhm portion of the dummy load when there is no bridge load and the bridge pot is set to zero Ohms, Under these condi- tions, the 00027-uF cou- pling capacitor [that's not a critical value — anything from 0 001 to 0,05 will work as well) will charge to the peak value of the rf sine wave.
Since the peak value of a sine wave is 1 .41 4 times the rms value, it is easy to cal- culate a dc value which, when fed into the instru* ment, will read the same on the meter as some given rf power. A conversion chart for the 53-Ohm dummy load is given in Table 1 along with the equation necessary to calculate your own equivalents should you
use some other combina- tion of resistors. Since I was interested in converting CB sets, I calibrated my watt- meter for a full-scale reading of 5 Watts, even though the resistors can handle 10 Watts for short periods. To make the 5- Watt calibration, feed a measured 22.9 volts into the unit, turn the sensitivity control ail the way down (maximum resistance), and select a value for R1 that gives a full-scale meter reading.
Now comes the hardest
part: making the meter face. I don't like conversion charts so I made a whole new face for my meter. It's not as difficult as you might think, but it does require a steady pair of hands.
Open the meter, remove the two screws holding the faceplate in place, and remove the faceplate while taking care not to damage the meter pointer Glue a clean piece of white paper over the old faceplate using paper paste and not liquid white glue (which tends to
dampen the paper so much that it wrinkles). Be sure to cover the faceplate evenly with paste so the paper won't have a chance to wrinkle. The pointer travels close enough to the face- plate that it can get stuck on wrinkles,
When the paste is dry, use a sharp knife to trim off the excess paper, and a pin to punch through the screw holes. Now a drawing set with an ink compass can be used to draw in a nice arc for the baseline of the new scale. Remount the face- plate, center the meter zero adjustment, and make a light pencil mark under the pointer tip to define the zero rest position. Reapply the 22,9 volts and make another pencil mark to spot the 5-Watt full-scale posi- tion. Now go down the list in Table 1 and mark off each intermediate point, checking occasionally that all of the poinb are repeat- able and properly marked.
Finally, remove the face- plate again and finish off the scale graduations with
73 Magazine • Fabruary, 1982 21
TAP POSITION SeT &1 FACtOftT
TR^NSMrSSlON
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VERTICAL AAlKitTOR
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LOAC^ING COIL
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fig. 2. Shortened haded verticai a CB mag-mount whip.
ink or dry transfers using the light pencil marks as a guide. With a little care, the results can be pretty profes- sional. One real bonus of this technique is that the calibration is correct with the particular diode, resis- tors, and meter actually used, since the whole cir- cuit is calibrated at once. That's important because the diode is not a perfect rectifier and the meter scale will be influenced slightly by the characteris- tics of the particular diode used*
An Application Example
The most obvious use for
|
Input Power |
Dc Voltage |
|
Watts |
Equivalent |
|
5.0 |
22.90 |
|
4.0 |
20.49 |
|
3.0 |
17.74 |
|
2.0 |
14.49 |
|
1.0 |
10.24 |
|
0.5 |
7.24 |
|
0.4 |
6.48 |
|
0.3 |
5.61 |
|
0.2 |
4.58 |
|
0.1 |
3.24 |
Table 1. Wattmeter calibra- tion. Input power levels cor- responding to dc voltage equivalents. Values are cat- culated using E = V 2RP, where P = rf power [in Wattsl R — total dummy re- sistance, and £ = ofc input voltage (where E is peak value of rf sinewave}. Cau- tion: With these dc inputs, the dummy load is dissipat- ing twice the indicated rf power, so be careful not to overheat the resistors.
22 73 Magazine • February. 1982
the rf resistance bridge is in making matching adjust- ments to antennas. Some antennas^ dipoles, for ex- ample, are easy to adjust with an swr bridge since their feedpoint impedance at resonance is already close to the typical cable impedance. When a dipole is fed with either 52- or 73-Ohm coax, its swr at resonance is bound to drop to somthing like 1.5:1. This isn't true with shortened an- tennas such as mobile whips since their feed im- pedance may be only a few Ohms.
There are two adjust- ments necessary to get a low swr with such an anten- na: one for resonance and one for impedance match- ing. Making these two ad- justments With only an swr bridge can be very difficult because a low swr will re- sult only when both settings are correct. With a re- sistance bridge, the adjust- ment is much easier.
Consider the antenna shown in Fig. 2, a magneti- cally-mounted, base-load- ed CB whip. The antenna really has two adjustment points, although the tapped loading coii is normally ad- justed and sealed at the fac- tory and all that is neces- sary for 27-MHz operation is a slight height adjust- ment. Putting this antenna to use on 10 meters or using a different length whip sec- tion may change things enough that a low swr can-
not be achieved without a change to the coil size or tap position.
For example, I am using one of these antennas on the roof of my house as a loaded ground plane. The eight 1 /4A radials laid out on the roof do not provide the same type of ground return as the roof of an automo- bile. In addition, a 5' whip is being used as a radiating element in place of the orig- inal 3' length. This longer length lets me use a smaller loading coil with lower losses I built this test irv strument partly because of the difficulty I was having trying to tune this antenna with only an swr meter and grid dipper.
Adjusting such an anten- na is a lot simpler with the rf resistance bridge, but first the bridge must somehow be connected to the base of the antenna, ft would be nice to locate the bridge physically at the base of the antenna but this isn't always practical For one thing, the bulk of the oper- ator's body would probably upset the antenna tuning If the bridge is connected to the antenna through a length of coaxial cable then that cable length must be chosen carefully because the impedance seen look- ing into a transmission line depends on three things: the line impedance, the load impedance, and the line length.
Luckily, it happens tiiat a
section of transmission line which is some multiple of a half wavelength in length will have an input imped- ance almost exactly equal to its toad impedance. Us- ing such a line makes it pos- sible for the bridge to be located at some convenient position and still indicate the antenna base imped- ance At 28 5 MHz, a half wavelength in free space is 16' 5" and in coaxial cable it will be about 2/3 of that or
If you have a section of
cable this length, it is easy to check its electrical length with the bridge. First put a 10-Ohm resistor dh rectly on the bridge and check for the null at 10 Ohms Then insert the cable section between the bridge and resistor and see that the bridge still reads a resistive 10 Ohms, If it is a little off, as indicated by an incom- plete null somewhere near 10 Ohms on the dial, you may want to change the transmitter frequency a bit to adjust the operating wavelength to the line's physical length.
lust for fun, you might try a quarter wavelength of cable and verify that it transforms the 10 Ohms in- to 270 (52'Ohm cable). In fact, you might get out a good article on transmis- sion-line matching sections and try a number of things with different loads and line lengths — it's fun and really brings that dry old theory to life.
With the antenna fed through some multiple of a half wavelength of cable, the radiator length can be adjusted for resonance as indicated by a complete null of the meter reading. The resistance indicated at resonance is the feedpoint impedance of the antenna, and the ratio of that imped- ance to 52 Ohms is the swr on the cable — assuming you're using 52-Ohm cable. If the swr is more than 21 (antenna impedance great- er than 100 or less than 25 Ohms), then you may want to change the coil tap posi- tion. It probably is easier to change the inductance be- low the tap by squeezing or separating the coil turns there slightly than it is to unsolder and move the tap itself. These adjustments can be pretty fine and you probably won't end up changing the coil size by a whole turn's worth anyway.
With the inductance changed, look for the new null on the bridge and, once again, adjust the antenna
i
height until the feedpoint impedance is pure resis- tance. Depending on whether that resistance is closer or further from the 52-Ohm target, you now know in what direction the coil must be altered to ef- fect an acceptable match.
Conclusion
Of course, there are many other tuning applica- tions for this instrument besides CB antenna conver- sions. You will find it more useful than an swr bridge for any application which requires both resonating a load and transforming its impedance. As a bonus, you can use it to measure swr when the load impedance is mostly resistive. The inter- nal dummy load lets you adjust and modify antennas without danger to your transmitter and without putting a big signal on the ait YouH also find that the dummy load and calibrated
wattmeter are a valuable QRP tune-up aid Last, but not least, you can develop a real understanding of trans- mission-line matching tech- niques by using the bridge to verify some of the theory you read when studying for your ticket] ■
Referdnc«8
1 a KISnet WB6BIH, ^'Home- Brew Rf Impedance Bridge/' 75, May, 1980.
2. J. Sevick, "Simple Rf Bridges/' OST, April, 1975.
3. W. Vissers, "Tune-up Swiftly, Silently, and Safely," OST, December, 1979.
4. R. Luetzow. "Build an Oper* ating Impedance Bridge," QST, November, 1979.
5. R. Hubbs and R Doting, 'Im- provements to the RX Noise Bridge/" Ham Radio, February, 1977,
6. J. Hall and J. Kaufmann, "The Macro-Matcher/' QST, January, 1972,
7. W. Orr, editor. The Radio Handbook, Editors and Engi- neers, Ltd.. 1962,
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24 73 Magazine • February, 1982
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• THREE SCAN MOOES WITH AUTO RESUME: "Sampling" mode pauses at tHJsy channels, tnen resumes 'Busy mode stops ai a busy ct^nnel then resumes shcniy after frequency clears "Vacant" mode Stops at a vacant channel and resumes when signal appeara. If desired auto resume may be prevented by pressing one button ^PARE"
■ REMOTABLE HEAD: The control head may be located as muchas 15 feet away from the main unit using the optional connecting cabia COMPARE!
• PL TONE OSCtLLATQR BUILT IN: Frequency is adjustable to access PL fBpeater&
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• GREEN FREQUENCY DISPLAY; Frequency numerals are green LEDs iof supenof visibility
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• SUPERIOR RECEIVER: Sensitivity is better than 0.28 uV for20-dB quieting and 0.1 9 uV lor 1 2-da SI NAD, The squelch sensitivity is superb, requiring less than OT uV to open, The receiver audio circuits are designed for maximum inleiisgibHity and lidefity. nOMPARii-r
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Police Freqs for the TR-2400
a sleepless night for the mod squad
I do not need to extol the bounty of convenience and luxury Kenwood's new TR-2400 hand-held 2-meter transceiver has brought to VHF enthusiasts. Most hams, no doubt, have seen or read of its features— no- tably 10 channels of pro- grammable memory and its ability to scan these mem- ories, stopping on active or inactive channels. Being strictly a VHF enthusiast, my mind began to drift when my TR-2400 arrived to what the next advance in ra- dio/scanner technology would bring forth. It didn't take very long to imagine the first tri-band program- mable hand-held scanner
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< COLLECTOR
fig, 1. Vco location, 26 73 Magazine * February. 1982
After alL the TR-2400 had broken the ground, at least in a single-band version.
I also began to ponder the possibilities of convert* ing the TR-2400 to the "ac- tion band/' One sleepless night was spent tracing the schematic lines and deci- phering its method of oper- ation. I would like to thank Trio-Kenwood Corporation for their practice of supply- ing block diagrams and full schematics with their prod- ucts. 1 wish all manufactur- ers would make it a policy to do the same with every unit This ham, for one, dis- trusts "black boxes."
Several possibilities emerged to modify the TR-2400 so that reception in
the 154- to 158-MHz range would be possible. Three of them will be outlined here, from simple to complex. The simplest of these is cur* rently working in my rig The second requires moder- ate circuit modification, but may not work depend- ing on the range of the vco. The third method requires additional parts and good
instruments to adjust but is sound in theory. I present these here in hope that someone else will follow my theories, try to imple- ment them, and report their results. I cannot because 1 begin Navy pilot training at Pensacola, Florida, within two weeks of writing this draft and don't have the time!
Theory in Operation
The operation of the TR'2400 is fairly straight- forward as frequency syn- thesizers go. Referring to your owner's manual (pages 14 and 15) with the follow- ing description may be helpful, but not necessary, to follow the principle of the synthesizer.
Transistors Q7 and Q8 and associated power sup- ply pass transistors Q2 and Q3, respectively, form a complementary electronic switch — i.e., when Q2 is ON during receive, Q3 is OFF, and vice versa during trans- mit Q2 controls the fixed frequency receive beat os- cillator/tripler (XI, Q1), Q3
controls the transmit beat oscillator/tripler (X2, Q4). During transmit positive bias on the base of Q7 causes it to conduct to ground and turn off Q2 and Q8, which turns on Q3 and Q4.
The output of Q4 (138.5 MHz) and the VHF voltage controlled oscillator [vco, QIO) are mixed, filtered, and amplified by Q5 and Q6 This forms a downcon- verter, much like the i-f sys- tem when in a receiver. As shown on the block dia- gram in the manual, the output of Q6 is always be- tween 5,5 and 9.5 MHz for 2-meter operation (144.0 — 138.5 = 5.5 MHz). The full range is 5 4 MHz to 9,995 MHz, In receive mode, pass transistor Q2 activates Ql (127.8 MHz) and D3. The output of Ql is lower than Q4 by 10.7 MHz, which is the i-f frequency in order to keep the output of Q6 between 5,5 and 9,5 MHz, the vco must drop its fre- quency by 10.7 MHz, too. Most of this drop is ac- complished by D3 bypass ing C27 when forward bi-
ased, effectively increasing the value of C26 (the value of two capacitors in series is lower than the smallest value; bypassing one of them therefore increases the value of capacitance in the circuit). This lowers the vco frequency by about 10 7 MHz.
IC Q20 is a binary-en- coded 3 Vi -stage decade programmable counter (i.e,, it divides by any integer, not just powers of two). Ac- tually, as used here, only 3 decades are program- mable: units (A1-D1), tens (A2-D2), and hundreds (A3-D3). The thousands half stage (A4-B4) is wired at one thousand (i.e., A4 goes to Vdd and B4 goes to ground, a binary one). Frequency division of the signal from Q6 is therefore 1000 plus whatever is loaded into Q20 by the microprocessor, Q25 (and interface ICs Q23 and Q24). Divisors range from 1080 at 143.900 MHz to 1999 at 148.495 MHz, the limits of the TR^2400.
The phase comparator reference frequency (5 kHz) is derived from X3 (10.240 MHz) and fixed binary di- vider IC Q22. To get 5 kHz in this case, a divisor of 2048 is used, which is 2^\ hence pin Q11 on the sche- matic. 10,240 kHz -s- 2048== 5 kHz.
The divided outputs from both IC Q22 (reference) and ICQ20 {signal} are fed to IC Q21 , the phase comparator. Any difference between phases in the two signals (usually caused by a dif- ference in frequency) causes an error voltage to appear at pin 1, ''AMP OUT." This output is proportional in magnitude to the phase dif- ference of the two signals. This error voltage is applied to D2 (actually a varactor diode) to tune the vco fre- quency and hence correct the phase difference the comparator in IC Q21 senses. Simultaneously, this
voltage is fed to four varac- tors In the front end (Dl-4) to ensure peak tuning across the band in the re- ceiver front end. The error voltage was measured at nearly 1/2 volt per mega- hertz of frequency change.
Back to the beginning for a moment. The trans- mit/receive switching volt- age used to drive Q7 and Q8 is closely associated with the biasing voltage for diodes D9 and D8/D27. These diodes select the routing of the vco output signal to either the receiver (D9) or the transmitter (D8/D27) as it is needed.
To complete the theory of operation, the deviation for transmitting is devel- oped in the vco. Output from microphone amplifier IC Q13 is applied to D5 in the vco, another varactor. Thus, modulation is true FM, produced directly at the VHF frequency without the use of frequency multi- pliers.
Conversion
The most commonly used portion of the VHF-hi public service band of usual interest lies almost exactly 10 MHz above the 2-meter amateur band (154 to 158 MHz). The transmit- ter frequency from the vco (1 43.9 to 1 48.495 MHz) is an appropriate injection fre- quency to the receiver for nearly the same range ( + 10.7 MHz = 154.6 MHz to 159.195 MHz).
The only trick necessary to accomplish this higher injection frequency is to use the higher-frequency transmitter beat oscillator (Q4) with the receiver and turn off the receiver beat oscillator (Ql) and D3. Two wires can be rerouted through the S. TONE switch (if not being used) to shift the receiver up band. No critical or sensitive circuits are disturbed, so perfor- mance is virtually ensured.
9.6 V DC
4eJEerfiMH£
if f ^ TO C2. C4
JUNCTION
*ro ca
vcv
TO VCV LINE
Fig. Z Suggested circuit Note: LM358 is a dual op amp /n ar} 8-pin DIP designed for single-ended power supplies.
In operation, the collector of Q7 is bypassed to ground, which switches the oscillators, as needed, but not the radio circuits.
The Mod
Turn the radio off and the TX offset to BU OFF. Re- move the four rear screws, back cover, battery cover, battery pack, and the two screws beneath the battery holder. Disconnect the bat- tery. Locate the empty area in the center of the rear cir- cuit board where the tone board would go. Find the red {V + ) and black (ground) wires and short them together (use a piece of insulated wire if you like). The red line will be disconnected from V+ in a moment. Replace the back cover without screws.
Turn the radio over, face up. Carefully lift the face plate up and off to the right. All these ICs are CMOS and could possibly be de- stroyed by statWfc charges on loose fingers or tools. There is no need to touch these, so donV Note: You will be on a remote lead of the microprocessor (PA2), but this lead has static protec- tion (C9, R66).
Find the 5. TONE switch assembly in the top, center. Just to the right of this switch is a black wire marked B1. Follow this wire down to the bottom edge of the board. Remove this one end of the wire from this point by cutting or un- soldering it. This discon- nects the red wire on the
bottom board from V + . Lay the black wire aside.
In the lower left corner is a shielded portion of the circuit. This is the vco. At the top of this box is tran- sistor Q7 and its associated resistors. To the right, in the 2 o'clock position, is R18. See Fig. 1. The wire lead of R18 is the connection point for the end of the black wire removed above. The lead on R18 has a ceramic coating for insulation, part of which must be removed to make a place to solder the black wire. This coating will chip away easily under a pen knife, razor blade, or even serrated plier tips if done very gently. After removing the insulation, solder the black wire to the resistor lead quickly. These small resistors won't handle much heat for long. Don't break the circuit. This is just a convenient attachment point.
That is the entire modi- fication. Put the case to- gether, careful not to pinch any wires, and connect the battery pack. Be careful not to overtighten the screws. Turn the radio on before moving the TX OFFSET switch from BU OFF,
Operation
This modification causes the ON AIR indicator to be on when the S. TONE switch is depressed. The transmitter is not on. The microprocessor (pin PA2) reads the collector of Q7, which you just shorted to ground, as the transmitter.
73 Magazine • February, 1982 27
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Only the transmit beat os- cillator is on. While in this mode, I suggest you keep the F LOCK ON and the TX switch in the STOP position to avoid inadvertent trans- mission while monitoring. If you do transmit, the trans- mission will be in the amateur band as usual. The transmitter is not shifted up band by this modification.
To receive the desired new channel, subtract 10/7 MHz from the known fre- quency (e.g., 155.61 MHz — 107=^144.91). Make sure the S. TONE is off (up po- sition] and program the radio as usual for the cor- rected frequency (e.g., 4.910). Now depress the S, TONE switch. As the ON AIR flag appears, your radio is tuned to the new channel.
While in this mode, the keyboard wit] not function, just as if you were transmit- ting; thus, there is no band scan or memory scanning,
28 TSMagazme * February, 19S2
These features may be re* gained by the more com- plex modifications, or by isolating pin PA2 of the mi- croprocessor and keeping it near Vcc (which I do not recommend). If the radio is turned on with the S. TONE switch already depressed, an incorrect display is likely to occur. Simply turn the S. TONE switch off, then on again to correct the read- out. Receiver sensitivity in the new band will fall off because varactors D1-D4 (front end) are not being properly tuned for this high- er range. However, sensitiv- ity remained sufficient to receive my local sheriff's department near the edge of the county.
Other Theories
The best theory requires some careful circuit work, but has great promise. Ba- sically, if you add 2000 to the divisor at IC Q20, all fre- quencies would be shifted
up by exactly 10.0 MHz, This is easily done by lifting B4 from ground and con- necting it to Vdd, or A4. Thus, programming would be just as on 2 meters — just the last 4 digits of the fre- quency, without the need for a correction factor. Us- ing this higher divisor would allow using the receive beat oscillator and keep band and memory scan capa- bility.
The easiest way to keep the vco working 10 MHz higher than usual above the receive beat oscillator is to isolate D3 in the vco by breaking the control line from Q2. An additional switch would be needed to switch it back in for normal two-meter operation.
A more extensive circuit addition may yield better results. The AMP OUT line from IC Q21 goes from about 1.2 volts to 3.4 volts (a range of 2.2 volts) from 143.9 MHz to 148.5 MHz (a spread of 4.6 MHz], or roughly +.5 volts/MHz. Thus, to go 10 MHz higher would require about 5 volts more, in addition to 3.4 volts, for a maximum swing of 8.4 volts. This is below the battery voltage and is therefore feasible, but may not be practical. There are several limiting factors that must be checked before im- plementing either modifica- tion: T capacitance range and response curve of D2 for these voltages; 2. main- taining the supply voltage; and 3, will tC Q20 handle an input frequency of 20 MHz?
The output of the AMP OUT line of ICQ21 is limit- ed to Vdd, the supply volt- age from regulator Q9, This is 6 volts, or about 10 MHz of total possible spread, us- ing 1 volt as a minimum figure and linear mode of operation from D2. One possible solution to this limited voltage swing is an amplifier stage with a volt- age gain of 2 connected to the battery line. The output
would feed varactors D2 and D1-D4 in the front end. This may tune not only the vco over the full 15 MHz, but also the front end to maintain sensitivity. How- ever, it may be impractical to use the unregulated bat- tery voltage. Low batteries and varying load conditions (e.g., audio) may cause volt- age fluctuations and insta- bility in the vco.
Still one more option ex- ists. Alternating X2 with a crystal for 45,9333 MHz would shift the transmit beat oscillator exactly 10.0 MHz above the receiver os- cillator instead of 10.7 MHz. These crystals would be switched in or out by means of their ground con- nection. These two crystals (X2 and X2A) would differ by less than 250 kHz, so the bandwidth of the oscillator should not be a problem. The accurate tuning of these crystals is imperative. To tune the front end, an op amp could be used in a volt- age summing circuit. (See the suggested circuit in Fig. 2.)
The trimpot would be ad- justed to add a preset value to the vcv (varactor control voltage] line to feed the front end (only) when switched in. When not in use, both sides of the pot would be grounded so it would add zero votts for normal operation. Note: X2A may also work on the receive oscillator side if Q1 is broadband enough, and D2 will work on a higher voltage. If so, change R3, 4, and 5 (Fig. 2) to 220k and connect the vcv line to D2 as welL Eliminate the con- nection to Q7. This will re- store memory scan again.
It is my hope that some- one else will pick up on these ideas and work them out to completion. In emer- gencies, such capability to switch between ham and police or fire department channels could prove very valuable.
Good monitoring! ■
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Those Amazing Bobtails
the current-fed connection
The Bobtail antenna sys- tem described in the references has created quite a stir Various com- binations of construction methods and feed systems have been suggested through a great deal of cor- respondence between vari- ous amateurs.
A nagging problem has been the lack of a satisfac- tory explanation of the op- eration of the antenna when it is current fed. It is hoped that this article may shed some light on this sub- ject and spur others on to try this excellent antenna.
To begin, we need a cou- ple of definitions: 1) Volt- age feed — feeding an an- tenna at a point where a voltage loop (or maximum) occurs, 2) Current feed — feeding an antenna at a point where a current loop occurs.
Antenna theory shows that whenever you have two vertical radiating ele-
ments spaced 1/2 wave- length apart, the radiation will be reinforced in a direc- tion perpendicular to a line drawn between the anten- nas. By using three vertical radiating elements Cor four, five, or morej all spaced 1/2 wavelength apart, the radi- ation will be reinforced in the same directions as be- fore, approximately propor- tionally to the number of radiating elements. Such an antenna is known as a cur- tain, Because our antenna has only three elements, it is known as a short, or Bob- tail, curtain.
Curtain antennas of the type described are bidirec- tional, with radiation pat- terns that look like elongat- ed figure-eights viewed from the top of the antenna looking down. The figure- eight pattern extends per- pendicularly from a line drawn between the anten- nas, and when many ele- ments are phased, the fig-
ure becomes longer and skinnier and the result is a bidirectional beam: a broadside array.
^r-T
(NSULATQfT
I Ma,
iMib
Fig. 1. The current-fed Bobtait.
30 73 Magazine • February, 1982
In order to understa the operation of the Bobtail curtain antenna, one must consider the antenna cur- rents in terms of their mag- nitude and phase relation- ship. Ideally, in an antenna of this type, all radiation is from the vertical elements, and little or no radiation oc- curs from the horizontal sections (flat-top portion) because these exist merely to achieve the proper phase relationship between the vertical elements.
Heretofore, the Bobtail has been voltage fed by means of a coupling net- work attached to the bot- tom of the center element, although it is possible, if de- sired, to attach the cou* pling network to the bot- toms of either of the verti- cal end elements
For many reasons, in- cluding convenience, ease of matching, simplicity, eltmiriation of coupling net- works, and other factors, it has been considered desir- able to find another way of feeding the Bobtail, and such a method has been reported as having been
used with success by a number of different ama- teurs. Here's how it works:
In Fig. 1 observe that the Bobtail array, as before, consists of the three quar- ter-wave vertical elements at A, B, and C, The two end elements at A and C are es- sentially a portion of the flat-top and connected di- rectly thereto.
The center vertical ele- ment is separated from the horizontal flat^top portion by a small insulator at C, and the conductors of a coaxial feedline are at- tached to the flat-top and to the vertical element, across the insulator, with the center conductor con- nected to the vertical, and the braid connected to the exact center of the flat-top, at B.
Vertical element A is sep- arated by 1/2 wavelength from element B, and verti- cal element B is separated by 1/2 wavelength from ver- tical element C Flat-top sections A-B and B-C act as phasing lines to make the current relationships in the antenna come out properly, i.e., the current in section A-B is iaO<^ out of phase with the current in B-C, and therefore they cancel.
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The currents in the ver- tical elements are in phase and add because the cur- rent is traveling tn the same direction at any given in- stant (but the currents are not equal tn magnitude). The reason for this is that the vertical elements are each only 1/4 wavelength at the operating frequency. The current divides be- tween the vertical elements in 3 ratio of two to one.
In order to satisfy the phase requirements, the magnitude of the current in the end elements must equal the magnitude of the current in the center ele- ment. Since there are two end elements and only a single center element, the current in the center ele- ment must be twice that in each of the end elements.
If you study Fig. 1, you will notice that for a par- ticular given half-cycle, the + and — signs are as shown, changing sign at
each T/2-wave point. We have assumed the feedline to be exactly 1/2-wave- length long. The arrows be- tween the plus and minus signs show the direction of current during the particu* lar half-cycle we've chosen to illustrate. During the next half cycle, note that the polarity at each of the half wave points will change and the current ar- rows will reverse direction, but also note that, once again, the currents in flat- top sections A-B and B-C will cancel. The currents in the vertical elements will again add in-phase in spite of the fact that their direc- tion is reversed. Thus, on each half of every full cycle the vertical elements al* ways add irnphase and the flat-top sections always cancel.
ialeresting Side Notes
If you turn a current-fed Bobtail upside down, it
looks like a much more familiar antenna system. By eliminating the phasing line (flat-top) and substituting ground, you have three 1/4-wave verticals spaced a 1/2-wave apart. This is very common practice in anten- na systems, for example, in the broadcast industry for directional beaming.
The disadvantage of all but perfect ground systems is the resistance loss in im- perfect conductors Con- sider, now, what happens when we use the Bobtail ar- ray: The "ground" becomes the horizontal wire or flat- top—nearly loss-free com- pared to ordinary ground and, better still, elevated above earth by at least a 1/4 wave.
What this means is that the antenna becomes more efficient and the radiating portion is raised The high- current portion of an anten- na is the portion which does the biggest share of the
radiating and that is why it is best to get it as high and as in the clear as possible. The Bobtail array accom- plishes these things and, therefore, is a good antenna compared to one in which the radiating portion is low and the losses in ground re* sistance are high*
One more item. Radia- tion from a Bobtail is ver- tically polarized and there* fore, when placed as in the configuration shown in Fig, 1, exhibits not only gain, but a very low angle of ''take- off/' as is typical of many vertical radiators. Hence, it's a good DX antenna. ■
References
1. Jerroid A. Swank W8HXR, "The 2aMeter Double Bobtail," 73 Magazine, May, 1980. Z Jerrotd A. Swank W8HXR, "The Amazing Bobtaii. . .Our Headers Respond," 73 Maga- zine, Decembef, 1980. 3, Alan Kaul W6RCL, 'The Both tail Curtain: Round Three," 73 Magazine, Ju\y, 1981.
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32 73 Magazine • February, 1962
When it comes to
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73 Magazine • February, 1982 33
David I, Brown W9CCI Route 5, Box 39 Noblesviile IN 46060
Shoot the Moon!
visual tracking for your EME array
{[} (2) {3)
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f/g. 7. Video monitor screen presentation. White squares with nunnbers are the maximum number of squares that can be lit Dark areas are never lit One possible moon image is shown by circle G7, This would light squares 6, 70, 17^ and 14. Adjust your lens or lenses for approximately this kind of spot size. The numbers correspond to the LDRs in Fig. 10.
34 73 Magazine • February, 1982
IS your OSCAR or EME array all automated for tracking? Mine is, but 1 still wanted a means of visually tracking in a manual mode- This article details the sim- ple "moon" camera I came up with to look at the moon while I stayed comfortably in my basement (Indiana winters get cold!). It also makes a fine motion detec- tor or low-resolution sur- veillance camera.
Take a look at Fig. 1 for a moment. What I have is the screen of a TV set or, in my case, a video monitor. There is no reason why you can't feed the video output of my simple camera to one of the TV game modulators and pipe it into any TV set as rf on whatever channel the game modulator out- puts on.
As shown, the spot or im-
age of the moon has been concentrated into a round circle that just illuminates one or more of the photo- sensitive devices (more on them later). Whenever light shines on these devices, their resistance is greatly lowered and I sense that change to light a square on the monitor screen. In order to have the different posi- tions on the screen repre- sent different aiming posi- tions of the antennas, there are two main requirements.
The first and easiest is that the camera be phys- ically boresighted to the antenna. That's just a fancy way to say that it has to be aligned to look where the antenna is looking.
Secondly, the photo de- vices must be arranged in an array that duplicates
what you want to see on the screen and then scanned in step with the monitor scan- ning. These last two require- ments are met easily using the circuitry and board lay- outs provided by this arti- cle.
Since I have started you out at the photo-sensing end, let's begin there on the circuitry and boards. The first thing you will notice is all the boards are round in- stead of square or rectangu- lar. This allows for mount- ing in a round enclosure (details later, under Me- chanical Assembly). The first board to consider is the LDR Board, shown in Figs. 2 and 4. I used light-depen- dent resistors (LDRs) as pho- to devices; mine are about V4 " in diameter at the light- input end. This allows the array of 16 LDRs you see the pattern for to fit easily on my round board.
To mount the LDRs in the board, you need sockets of some kind. This avoids di- rect soldering and the pos- sible altering of the resistive characteristics of the LDR. I highly recornmend an item called a matrix pin by AMP, Inc.; it is their part number 380598-2. These are single- terminal push-in sockets
and are sold by many parts houses and the magazine advertisers. Just drill out the circles to hold the sockets of your choice and load the board up as shown. All leads come to the board from the copper side and pass through their holes, leaving a small amount of the stripped lead on the copper side to solder to, When this board is com- plete, there should be seventeen leads 4'' to 5" long coming off the copper side. (Use different colors to avoid confusion.) 16 leads are to one side of each LDR, and one lead is common to all LDRs and is called the video lead [VI D), There is really no easy way to test the board at this point, so set it aside and go to the counter chain sche-
matic in Fig. 3. The cor- responding foil and compo- nent sides are shown in Figs. 5 and 6.
The counter chain should go together quickly, and it can be checked out fully when completed — less any other boards. Load the board as shown and then check the test points using a frequency counter or os-
Fig. 2, Foil side of LDR board.
cilloscope at each test point against Table 1. The starting point is at the 555 IC, as this is the master clock. It should run at 122.88 kHz, and you adjust to that using the PC board thumbwheel pot, Ra. The set you use for a monitor will more than likely lock up [have steady sync] if the clock is from 122.0 to 123.5
kHz, but you may have something called flutter due to a difference be- tween your divided-down vertical (59.57 to 60,3 Hz in the clock range just given} and the proper 60-Hz rate used to avoid beats against the power line 60 Hz.
The wide range of toler- ance on most TV sets allows you a lot of leeway
-!.lAfll"<>j-ji^,-JO*iJ^w»'l^>I'^"!^l^^l"W^i-%»^'^'!
TO FtG 7 DECODERS
TO PIS. t DECODERS
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6.7
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Fig. 3. Counter chain. Set for a frequency of 125 to 126 kHz at Frp test point For this appli- cation, CI = 220 pF, Ra - 10k thumbwheel PC pot Rb = 18k, V4-W fixed resistor. General formula is: f = 1/7 = (1A4]/Ra + 2Rb) X C
JSMagazine • February, 1982 35
TO DECODER SOA^D A
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o AMP SO€fC£T P\H
U P MOUNTING POST LOCATION
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NOT£ - SEE TEJCT
M P MOy»«TING POST LOCATIONS
^\-^ cAPAcrroR
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0 TEST PT.
Fig, 4. Component side of LDR board. M.P. designates
mounting post (threaded spacer) locations. Use alternate '''S 6. Component side of counter chain board. Standard locations between any board pair, thus only three spacers schematic symbols are used to show component mounting looking like a triangle between any board pair. Small circles locations. Solid lines connecting dots indicate jumper are socket pins for LDRs. Solid dots are leads from decoder i^^ds. Circled x indicates test point board B and should be inserted and soldered from the cop^
per side and excess lead on component side clipped off in the setting of Ra where using a 10k pot for Ra and flush with board. Resistor symbols are LDR locations. the set will lock up and look junnpers in the fixed Ra
atright. If you can't get positions, a smaller pot can things as good as you want be used along with fixed re- sis toKs) to allow Ra to ef- fectively tune slower. You would have to find the two extremes of Ra settings that create a locked-up picture, measure the resistance of Ra in each case, and use the difference as the new Ra value. Then fixed resistors make up the jumpers. Re- member, the total must be 10k.
Example: If the set locked up alright on resistor Ra settings of 2500 Ohms to 7500 Ohms, use a new Ra of 5k and one fixed resistor of 2500 Ohms in either fixed Ra {jumper) position. Your new range then becomes 2500 to 7500 Ohms.
Ignoring the +V and ground leads needed by all boards except the LDR board, there are only six leads leaving the counter chain board (A. B, C A', B\ CI and they all go to the Fig. 5. Foil side of counter chain board. points lettered the same on
3fi 73 Magazine • February, 1962
WORLD TIME WATCH
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decoder board A (Fig. 7). If these points are outputting according to Table 1, the 7442 decoders (I CI. IC2) will decode the BCD line codes into one of ten out- puts. Since the D line is not used off the 7490s, the 7442 becomes a one-of -eight decoder. In IC1, positions 1 to 7 represent seven verti- cal columns across your monitor screen. Position 0 is left as horizontal retrace and is covered on the vid- eo/sync board. ICl runs the sequence of 1 to 7, then 0, 32 times before any change occurs in the vertical scan decoder. This means 32 lines that are identical In vertical coding across the screen. This is accom- plished by placing a fixed divide-by-32 chain between the horizontal and vertical counters.
In the case of the number 1 LDR, if light is shining on it each of the 32 lines will go white from a black screen as it scans over the column position 4 (center). When this happens 3 times,
fig. 8. Foil side of decoder board A.
a white square is formed at the top center of your screen. When you have all your camera boards to-
gether but no optics or lenses over the LDRs, the monitor screen will tight
white squares in the same pattern as the LDRs are laid out on the board if
Fig. 7. Schematic of decoder board A.
31 73 Magazine • February. 1982
K
TO COUNT£ft CHAIN BD.
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T404
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M P MOUNTINS POST LOCATIONS
EXCEPT FOR LETTERS V a M TO VIDEO/SYNC BOARO
LETTERS 0 THRU K AND 3 THRU Z TO O^CODCR aOARD B
Fig. 9. Component side of decoder board A. Letters Vand H are leads to video/sync board. Letters D to K and StoZ are leads to decoder board B (except Vand HI Solid lines corh necting dots are jumpers on component side.
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FIADIO STATIONS COMMON? NOT THIS KIND is a histOfy of comTnunJca lions cqFtimeficing with ihe first visual systems, tefmirtatjng in a brief deficripyon of \he elocuonica fitted In the modem merchant ship, and c^niered afound the largest marme radio station In Canada. Halifax Radio VCS. As a mambar of iha Royat Canadian Navy, Matro Goidwyn Mayar Inc.. A(r Services Branch Department ot Transporl, Gypsum Transportation Ltd,, Royal Canadian Mounted Police, and Canadian Coast Guard. Mr. Floscoe has enjoyed iwenty^five years as a radio operator. He operates Amateuf f^aOio Station VE1BG and is an active member of Sociely of vyireiess Pjoneef». Veteran Wifeless Operators Association. Canadian Amateuf Radio Federation. Nova Scotia Amateur IRaOio Associal^on, Kinfjs County A mateuf Bad io Club, Am^r I ca n Red 10 Relay League and World Ship Soc lety Anyone with an interest In Amateur Radio. Ship Radio Stations, Commercial Radio Opefaiing, Telegraphy. Aifcratt, Ships, or Nova Scotian should find this book inleresimg «nd mforfnalive. R»«*m youT t<>py r»oi*. S«nd r^o money at this tlm*. Vou wllJ be rhotJfl*d ol the shippjnn date, and will t>« billed at that lima
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73Magaifne • February, 1982 39
COi_rilCJW 0€C0[)EII9
OPTION i -MQVKS kOA # »
FRiJM C0L-4/flaW4 (CENTER!
TO cat- 4 /HOW r ibtm center}
CHANOE ICe-l^ Z, 3 AS SHDWRf
I
E>
BTW CENTER
fWSTEAO pf CEIiTER OF SCREEN
Fig. 10. Schematic of decoder board B. Option 1 moves LDR #9 from column 4/row 4 (center) to column 4/row 7 (bottom center). Change iC8 pins 1, 2, and 3 as shown, and load LDR at bottom center.
light is falling on all the possible7X7 or49-position
resolution. The complexity is not worth it, and the camera functions just fine using only 16 of these 49 possible locations. This is accomplished by allowing the focused moon image to be larger than one square of resolution and using multi- ple lit boxes to show where the image is relative to center screen (on target) A perfectly aimed antenna will produce a white + sign at the center of the monitor screen.
LDRs. This will be a fina check that all is working, before the mechanical assembly.
The row decoder (IC2) does the same job as the column divider (IC1) but at a slower rate, to handle horizontal rows Therefore, it advances one position after each 32 horizontal lines This happens seven times, forming 7 horizontal rows of 32 lines each- If more LDRs and decoding were used, the camera has a
IC3, tC4, and IC5 are merely inverters to get the low 1-of-8 outputs of the 7442s back to highs that can be gated together in further TTL logic. Figs. 8 and 9 show the foil and component sides of decoder board A.
The last of the decoding occurs in Fig. 10, decoder board B, where 7403 gates are used to detect which of the 49 squares the monitor is scanning over and en- able the proper LDR for that segment. Figs, 11 and 12 show the foil and com- ponent sides of decoder board B.
For the positions that have no LDRs, as you will see more clearly next on the video/sync board, there will be no LDR enabled and the video (VI D) tine will be at or very near +V. This +V on the V ID line will represent a black screen on the monitor in the final video com* posite. For those squares that have an LDR sensor, each has a corresponding 7403 gate section. When the gate is enabled, the open collector output tries to pull + V down to ground through a load resistor. All the LDRs are in parallel by the video line, but only one at a time can be considered in the circuit— the one en- abled by the scanning chain.
Going briefly to point C
on Fig. 13, the video/sync board, you wit! see a 10k re- sistor to H- V in the base cir- cuit of the first video stage. The circuit is really a voltage divider consisting of that 10k at all times, in series with either (1) an LDR that is in series with the out- put transistor of its 7403 gate to ground, or (2) the 10k alone with no enabled LDR for those positions not having LDRs.
Remember, I said + V on the VI D line meant a black screen. Automatically, you have 33 positions represent- ing no LDRs and a black screen. In the 16 positions
having LDRs, the LDR rep- resents the lower resistor in a voltage divider and as such will cause the voltage at point C to be very close to +V [LDR off- no light), or very close to ground (LDR on — light shining on it). My LDRs swing from several megohms (dark) to about 400 Ohms (light). That means the voltage divider changes from (1) + V through 10k through megohms to ground, caus- ing the junction of the 10k and LDR to be very close to + V, to (2) a series of +V through 10k through 4(X) Ohms, causing the junction of the 10k and LDR to be very close to ground. This junction voltage controls the base of the first video stage.
Following through the video for an example of one LDR with light on it. the VID line and point C wilt be low or near ground, The first video stage is just an emit- ter follower, so no inversion occurs and the base of the second video also will be low and the transistor at or near cutoff. When it is cut- off, the collector rises to at or near + V, and this repre- sents white on the screen.
The last stage is also just an emitter follower to allow enough current to drive a 750hm cable and the 75- Ohm load presented by either the game modulator or the video monitor input If the monitor has a gain or video drive control, jumper A to C in the last video emit- ter circuit and omit the on- board gain pot, RL, If the monitor has no control or the game modulator no in- put gain adjust use RL and jumper B to C to allow some means of adjusting overall composite video level.
The base of the final vid- eo stage has control from two more points that should be covered here. The two transistors with H and V for inputs are the sync mixer and make up the
40 73 Magazine • February, 1982
final composite video. Each time the H line goes high [every horizontal line, posi- tion 0) or the V line goes high (every vertical scan or field, position 0), the base of the final video is dropped to approximately 0,2 volts, or close enough to be called ground. This is sync-voltage output in my camera.
If the video example were reversed, using a dark or absent LDR position, the second video stage can turn on only to the point where its collector is at 1.4 volts. This is caused by the two diodes in its emitter for 0.6 volts apiece and the 0.2 volts from emitter to col- lector on the second stage. This 1.4 volts becomes our black level, and allows for the normal video com- posite of sync being blacker than black. If you consider my composite video as 0.2-volt5 sync, 1.4 volts- black, and 5.0-volts white, then divide it down with the level control, you will end up with video composite of very close to the standard of 1,0-volt video, 0.4-volts sync. It at least seems to be close enough for a perfect picture with stable sync, and I felt that trying to get any closer was not worth the time or extra com- ponents. Foil and compo- nent layouts for the video/sync board are shown in Figs 14 and 15.
That about completes the electronics package, and if you have a power problem, the 74Cxx equiva- lents can be used for ail the TTL devices except the final 7403 decoders The 555 is running well below its max- imum + 18 volts, but seems content and quite stable on + 5 volts.
Mechanical Assembly
The area of mechanical assembly will vary, as with most ham projects, along with its uses. For that rea- son, rll outline how I did mine and you can carry on
Fig. n. Foil side of decoder board B.
or modify from there. As il- lustrated in Fig 16, the housing on my camera is PVC plastic pipe! That's why all the boards are round and separated by three spacers between each board. You can, thereby, build up a board-over- board sandwich by skipping every other hole of the six given per board to set the spacers on.
Looking straight into the LDR board, it is spaced from the board below it by 3 spacers in a triangle, The next board befow, by 3 in an inverted triangle, and so on, I used 4-inch id. black pipe, and would suggest that whatever you use be black inside to avoid light re- flections and stray light. You can buy end caps for the pipe, and I used one as is on the rear of the camera. It was stuck on with rubber cement for easy removal. One hole in this cover al- lowed the RG-59 feedline to exit through, and a second would have to be provided if the on-board level control is used — I did not use it.
The front cover 1 made
from another end cap, but 1 sawed off the entire lip from the horizontal center
line down. This allowed me to add small aluminum brackets to one side To the
■4 JUMPER
# , LTR tN/OUT LINES
M P MOUNTING POST LOCATION- SEE ASSEMGLV NOTES
Fig. 12. Component side of decoder board B. Numbers and letters indicate proper placement of input/output leads to other boards. Solid lines Connecting dots are jumper leads on component side.
73Magazfne • February. 1982 41
FIG ID
HI 'LEvei. TEST POINT
COttPOSiTt
*5V
©r'^O Q^
I
;>o)c
PA»*EL Trt^E FEMALE ftHC
-0
nc T
F/g, 13. Schema f/c of vic/eo/sync board. Al! transistor de- vices shown are smail'Signal NPN devices in an RCA IQ CA3046. Numbers shown around the e-b-c of devices indi- cate pin numbers of that /C for reference and troubleshooting. Note: If cable is terminated in 75 Ohms at the monitor or a drive-level pot (usually 50 to 100 Ohms in monitorsl use H from A toC and omit pot RL. If no drive level is used on your monitor, jumper B toC and use RL as your drive control to prevent overtoad.
bracket is attached a rod that runs down the side to- ward the rear to a small, sealed, metal box that holds a 4-rpm dc motor I had lying around. It is much
like the ones the advertising signs use, and I think it was for 6-V dc battery opera- tion. Plus 5 votts runs it just fine, if a bit slow. This al* lows me to remotely rotate
a 'iens cover" of sorts on and off the end of the pipe to keep rain, snow, dirt, etc., out of the lens area.
On the topic of lenses, or optics, I am still trying for a better setup, but one of my prime criteria was that it be cheap. After all, I'm trying to avoid using an SSTV or FSTV monitor camera be- cause of cost, so why use a camera lens that costs more than the system electron- ics? So far, the best combi- nation I have found is with dime-store magnifying glasses with their handles removed.
I fixed-mounted one that was right at 4 inches o.d. at the center of a 6-foot piece of PCV pipe, and that al- lows me to slide the elec- tronics in and out towards it from the rear. I also have a 33-inch lens mounted in a 4-inch collar that I can slide in and out from the front of the pipe to form a com- pound lens system. That is the area of experimentation at the moment and 1 don't mind admitting my physics classes were too long ago. Optics was never really my bag, nor was photography, so all help offered will be
|
Signal |
Location |
Measured Frequency |
|
1- F,^ |
556 IC pin 3 |
122.880 kHz (for H |
|
2. A |
Column *C pin 12 |
61.440 kHz |
|
IB |
Column IC pio 9 |
30.720 kHz |
|
4.C |
Column IC pin 8 |
15.360 kHz |
|
5.0 |
-i- by IC pin 11 |
960 Hz |
|
6.Q |
-i- by IC pin 12 |
480 Hz |
|
7, A' |
Row IC pin 12 |
240 Hz |
|
6. B^ |
Row IC pin 9 |
120 Hz |
|
9.C' |
Row IC pin 6 |
60 Hz |
= 1 5,360 Hz, V = 60 Hz)
This has the horizontal sync running about 400 Hz low, but allows the vertical sync to be correct to avoid vertical ^'flutter/' This is a compromise to reduce system electronics, but all sets tried pulled in easily to the tower horizontal rate. The following is a representation of ttie VID Ime with light shining on all LDRs. L rs TTL low pulses. Scope Horz, rate = 1/60 sec per full horizontal scan or about 3 ms per cm on a 6~cm Horz. scale.
HHHLHHHSHHLHLHHSHLHLHLHSLHLLLHLSHLHLHLHSHHLHLHHSHHHOHHHS
H is TTL high, S is sync (app. 0.2 volts). 0 is option LDR 9
Table 1.
i
4
gratefully accepted.
The limitation of this sys- tem would seem to be use only during full moonlight, but that depends on the response of the photo de- vice you use and the lens system you end up with. As it stands now, 1 can track in some very hazy conditions, and even clouds don't con- fuse things too much. Next to try is a full-blown in- frared system, I think I
For all the OSCAR fans who read on when the name was mentioned in para- graph one, I have not gone bananas enough to try visu- ally tracking an OSCAR sat- ellite with the LDR system. However, the same elec- tronics system is being tried, mounted in the same waterproof 'type housing with two full caps. The dif- ference is that the 7403 out- puts will be used to activate PIN diodes [or similar switching devices) on the downlink antenna system. I am trying to build onto the outdoor, steerable OSCAR antennas something like my Twin lead Terror antenna system [73 Magazine, No- vember, 1977, p. 54J, and then do the video add-on at the monitor end using the sync/white commands com- ing down the 75-Ohm cable. The video then would be derived from some form of the receiver age. I men- tioned this earlier, in the Twinlead Terror article twhich got titled, "Cheap Ears for OSCAR" V
You can do some posi- tively wild things with scanned and electronically- steered antennas when you have only receiver power levels to worry about. It becomes even easier when you have a full-duplex, two- band arrangement like the OSCAR uplink/downlink. The receive antennas scan at a high enough rate to be above audio, so you can easily filter out the switch- rate whine A I! you hear is the additive result, but each antenna's age product is
42 ?3Magaime • February, 1982
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73 Magazine • February. 1982 43
Fig. 14. Foil side of video/sync board.
sampled, and only the high- est is used to light the white box on the monitor — sort of
a sample, hold, choose-the- highest-figure, and use*for- displav system.
INPUT LRD VIDEO FflOM ytD OH LRD BQ
INPUT \/ERT SVNC FROM DECODER eOARD A HOLE V
INPUT HO 2 SYNC FROM DECOOER BOARD A- HOLE H
I am still deciding wheth- er to use steer antennas to produce center-box white scheme, or sample and dis- play all levels as boxes in the same arrangement in which the antennas are me- chanically set up. The latter has the advantage of being able to tell what polarity sense the signal really is, at the antennas, by observing what box(es) are lit the brightest, and to what polarity you have those antennas aligned. It does re- quire small changes in the video stage of the camera, however, so you don't get just saturated white or black off positions in-
tentionally chosen for the
EME arrangement
1 have tried several sam- ple-and-hold circuits and antenna positionings so far and have found none to be the perfect result I want Many such circuits are al- ready around as described in the articles over the past couple of years and IO- meter antennas are easy to build, so you may have your system running before 1 have mine complete. I am working hard on the EME version at the moment, but should get back on the OSCAR version soon.
The cost of the A-to-D converter IC is quite attrac- tive now, and with my love for digital circuits I am go- ing to try one more sampie- and-hold circuit using that type of device. It is an analog in, 3 digits in BCD output device covered a bit further as an antenna read- out device for use with CDE Ham 3 rotator controls in Ham Radio, January, 1979, p. 56, The device used there is an AD 2020 by Analog Devices, Norwood, Massa- chusetts.
If there are any ques- tions, please include an SASE, and HI sure try to help you. if you come up with other uses (surveiU lance, etc.), please write, as several people have al- ready approached me with ideas beyond what I had in mind. Til try to act as a go- between as best I can for any new ideas for my camera. Good lookin'.B
use i^Af^m HOSE clamps
TD ANGLE tnOhl FOR AlOUP^TmC
CABLE WITH + 3V AND 6N13
TARGET
CAP
ROTATES
ROD AND BRACKET
JUMPER
(^'vv^^ RESISTOR
MP. MOUNTING
POST LOCATIONS
IN9(^ diode:
Fig. IS. Component side of video/sync board. Schematic type symbols are used to show hading placement of com- ponents. Solid lines connecting dots are jumpers on compo- nent side.
MOVABLE LENS
LEVEL CONTROL SHAFT
OF REQ'Dl
nS^ED LENS CAMERA
4" PVC PiPB
RG-59
Fig. 16. Mechanical assembly of the camera.
44 73 Magazine • February. 1982
f^esder S^fvice for facing page ^331^
^
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^
♦ *'
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K H )
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^ 2.M HanrtWW FM Traww**
r; msS5^tw1d lamp . o-s..™^"-"'
16KEY «m)«"CH • MV»a")w»«»
^ K'waWT SCAM I«1K8 . sc" -•"•»"" "«■»""' "•"""^r^ POWER • 3 ««s wg". 1 «'"°"' '•'" ""^
*l^^ hand strap cfflvj^S^'^tw operator - ^^ and soac a stand ror xaow-ti^ ■'>^ ^^
TKj
l^lt^UFACtUF^E^
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4MATHUR-WH0tESALt ^^^^'^^"'^'^^
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*t^3356 Toii-<T«et800)^*
Mike Zedan WDSIiW 4221 turn Road AttiC^ Mi4B4l2
Technical Clinic PO Box 636
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FRCaHAMWAALC DIVIDER IC
juirpcn on
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BOTTOM
fig. 1.
Being a group that takes pleasure in passing along useful information to fellow hams, Technical Clinic sends this public in- formation bulletin on the 10-minute frequency modi- fication for the new I com IC-2A hand-held. The short and simple job will allow operation (depending on in- dividual radio characteris- tics) from 141.000 MHz to 149 995 MHz
TC was pleasantly sur- prised to discover that Icom has made another rig that lends itself to tinkering.
This happened while one was on the bench for a product development experiment,
You will need only solder and a low-wattage solder- ing iron. The two-step oper- ation is as follows:
1. De-solder the brown jumper wire from the MHz BCD thumbwheel switch. This will allow the MHz switch to run through its whole range.
2. Solder a small piece of wire (or form a solder bridge) at the position
where the cellophane PC harness terminates at the programmable divider IC, as shown in Fig, 1. This allows the radio to recog- nize a request for 148 and 149 MHz.
That's it. You now have a radio with MARS/CAP capa- bility which has not had any of its normal operation im- paired one bit. It is hoped that all present and future owners of this rig will take full advantage of this mod once their individual war- ranties expire. ■
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73 Magazine • February, 1982 47
SOCIAL EVEHTS
Listings in this column are pro^iiiefS free of charge on a $pace'av3if3t>fe basis. The fotiowing inform&tion should be inctuded in every announce- ment: sponsor, event, date, time, place, city, state, admis- sion charge (if any), features, tafk'in frequencies, and the name of whom to contact for further information. Announce- ments must be received two months prior to the month in which the event takes place.
knuHtnon heiqhts il
FES 7
The Wheat on Community Radto Amateurs will hold their annual hamfest on February 7, 1962, beginning at S:00 am at the Arlington Park Race Track EXPO Center, Arlington Heights IL. Tickets are $3.00 at the entrance and $2.50 in advance. There will be free fiea-market tables, ex- panded floor 3|mce, parking, awards^ and a large commercial areai, including the new com- puter section. Talk-in on 146.01/Jt and 146.94. For com- mercial info, call WB9TTE at {312>-765-16S4; for general info, call WB9PWM at (312)^29-1427. For tickets, send an SASE to WCRA. PO Box QSU Wheaton IL 60187,
TRAVERSE CITY Ml FEB 13
The Cherryfand Amateur Ra- dio Club will hold its ninth annu- al Swap 'N Shop on Saturday. February 13, 1962, from 8:00 am through 2:30 pm at the Immacu- late Conception Middle School gymnasium, 218 Vine Street, Traverse City Ml. General admfs* slon Is $2.50 and single tables are $3.00. Talk-in on 146.35 and 146.52. For further information^ contact Jerry Cermak K8YVU, Chairman, 3905 SI usher Road, Traverse City Ml 49684. An SASE wJ]] be appreciated^
MARLBORO MA FEB 14
The Algonquin Amateur Ra- dio Club will hold en electronics flea market on February 14, 1962, at the MarltHDro Junior High School cafeteria, Marlboro MA. Sellers will be able to set up from 9:00 am to 10:00 am and doors will be open from 10:00 am
4t 73 Magazine • February, 1
until 2:00 pm. Admission is $1.00. Tables are $5.00 if a writ- ter> reservation is made before February 7, 1982, and $7.50 for any tables remaining after that date. Refreshments will be avail- able. Tatk-in on *01/-61 and .52. For reservations, contact Mac W1BK. 128 Forest Avenue, Hud- son MA 01 749.
MANSFIELD OH 14
The Mid-Winter Hamfest/Auc- tion wHI be held on Sunday, Feb- ruary 14, 1962, at the Richland County Fairgrounds, Mansfield OH. Doors will open to the pub* lie at 8:00 am. Tickets are $2.00 in advance and $3.00 at the door. Tables are $5.00 in advance and $6.00 at the door. Half tables are available. Features will Include prizes, an auction, and a flea market, all in a large heated building. Taik^in on 146.34/. 94. For additional information, ad- vance tickets, and/or tables, send an SASE to Harry Friet* Chen K8HF, 120 Homewood Road. Mansfield OH 44906. or phone (419^529-2801.
VERO BEACH FL FEB 20
The Treasure Coast Hamfest will be held on February 20, 1982, at the Vero Beach Com* munity Center, Vero Beach FL Admission is $2.00 in advance and $2.50 at the door. Features will include prizes, drawings, a QCWA funcheon, and tallgatir^g. Talk'in on 146.1 3/ J3, 146.52/.52, 146 04/64, and 222.34/223.94, For additional information^ write PO Bojc 3088, Beach Station, Vero Beach FL 32960.
FAYETTEVILLEWV FEB 21
The Plateau Amateur Radio Association will hold Its fourth annual hamfest on Sunday. Feb- ruary 21 ^ 1982, at the Memorial Buildfng, Fayettevflie WV. The doors will open at 9:00 am. Ad- mission is $2.50 and children will be admitted free. Flea mar- ket tables are $2.00, AiJ activi- ties will be indoors and wilt in- clude ARRL displays, forums, exhibits^ door prizes, and wom- en's programs. Hot food, re-
982
freshments, and free parking will be available. Talk-in on .19/, 79 or .52. For more informa- tion* contact Bill Wilson WA8YTM. 302 Central Avenue. Apartment 2, Oak Hill WV 25901, or phone (304)-469-99l0 or (304)-469'93l3.
LANCASTER PA FEB 21
The Lancaster Hamfest will be held on Sunday, February 21, 1982, at the Guernsey Pavilion, located at the Intersection of Rtes, 30 and S96, east of Lan- caster PA. Doors will open at 0800. General admission Is $3.00; children and XYLs admit- ted without charge. Each 8rfool space with a table »s $5.00 (limited to two tables for norv commercial use and six tables for commercial use). All inside spaces are by advance registra- tion only, and the registration deadline is February 10, 1962. All vendors myst set up between the hours of 0600 and 0800; reservations will not be held past 0900 hours without prior ar- rangement. There will be free tailgating In specified areas out* side (if weather permits) on a first'Come, first-served basis. Food will be served at the hamfest. Talk*in on 146.01/.61 or 146.62. For advance registration or more information, write SERCOM, Inc., PO Box 6082. Rohrerstown PA 17603.
ELKIN NC FEB 21
The fifth annual Elkin Winter Hamfest will be heid on Sunday, February 21, 1982, at the Elkin National Guard Armory, iocated one mile from Interstate 77 at exit 85, Elkin HO. Breakfast and lunch will be served at the ham- fest by the Foothills ARC of Wilkesboro NC and the Briar- patch ARC of Galax VA. Talk-in on 144.77/146.37. 146.22^146,82, and 146.52, For table reserva^ tions, ticket inquiries, or other information, contact Earl Day WB4GQP, 131 Harris Avenue, El- kin NC 28621, or phone (91 9)-835- 3509.
MORRIS PLAINS NJ FEB 25
The Split Rock Amateur Radio Association will hold its annual eq uipment auct ion on Thursday, February 25, 1962, at the Morris Plains VFW Post #3401, located on Route 53 in Morris Plains NJ. Doors will open at 7:00 pm to unload and Inspect equipment
and the auction will get under- way at 6:00 pm sharp. Admis- sion is free. Please limit your items to working electronic equipment — no lunk — and make sure any loose parts are bagged or boxed. The club will take a flat 10% commission on all sales of Individual items up to $50. Above $50, the club will take a $5.00 commission on each In- dividual sale. All commissions are payable In cash only. There will be refreshments available and the site has plenty of park- ing. In case of inclement weather, the auction will be held on Thursday, March 4, 1982, at the same location and times. The Morris Plains VFW Post is located approximately 1 mile north of the intersection of Routes 202 and 53 in Morris Plains WJ. For more informa- tion, write PO Box 3, Whippany N J 07981 ,
GLASGOW KY FEB 27
The annual Glasgow Swap- fest will be held on Saturday, February 27, 1982, beginning at 8:00 am CST at the Glasgow Flea Market Building, 2 miles south of Glasgow on Highway 31 E. Admission is S2.00 per per- son with no extra charge for ex- hibitors. One free table will be provided per exhibitor with extra tables available at $3.00 each. There will be a large heated building with plenty of free park- ing. No meetings or forums will be held— just door prizes, free coffee, and a large flea market. Talk-In on 146.34/.94 or 147,63i .03. For additional information, contact Bernie Schwitzgebel WA4JZ0, 121 Adairland Ct., Glasgow KY 42141,
VIENNA VA FEB 2B
The Vienna Wireless Society
will hold the 9th annual ARRL- approved WINTERFESTTm ^32
on February 26, 1982, beginning at 8:00 am at the Community Center, 120 Cherry Street, Vien- na VA. Tickets are $3.00 and in- clude one chance for the prize drawing* Prizes will include a Kenwood TS*630S HF transceiv- er, an Icom IC-26A 25- W mob its 2-meter rig, and a Santec HT-1200 hand-held, as well as accessories and books. Excel- lent food service will be avail- able. Featured will be deaiers* and manufacturers' displays, an Indoor flea market, and outdoor frostbite tailgattng. Tables are
$5.00 and $10.00. Talk-in on .31/.91 and 146.52. For addition- al information, send an SASE to WINTERFEST"^f^ ^82, Vienna Wireless Society, PO Box 418, Vienna VA 22180, or phone Ray Joiinson at (703)-938^3ia
DAVENPORT lA FEB 28
The Davenport Radio Ama- teur Ciub will hold its 11th an- nual hamfest on Sunday, Febru- ary 28, 1982, from 8:00 am to 4:00 pm in the Davenport Masonic Temple, Highway 61 (Brady Street) and 7th Street, Daven- port !A. Tickets are $2.00 in ad- vance and $3.00 at the door. Ta- bles are $5.00 each, with a $2.00 charge for an electrical hookup (limited number). Hotel dis- counts, food, and drinks will be available. Talk-in on 146.28/.B8, W0BXR, For advance tickets and table reservations, write Dave Johannsen WBOFBP, 2131 Myrtle, Davenport I A 52804.
LAPORTE m FEB 28
The LaPorte Amateur Radio Club Winter Hamfest will be held on Sunday, February 28, 1982, at the Civic Auditorium, LaPorte IN, beginning at 3:00 am Chicago time. The donation is $2.50 at the door and reserved tables are $2-00 each. For res* ervations, write PO Box 30. LaPorte IN 46350,
AKRON OH FEB 28
The Cuyahoga Falls Amateur Radio Club will hoid its 28th an- nual electronic equipment auc* tion and flea market on Stinday, February 28, 1982, from 8:30 am to 4:00 pm at North High School, Akron OH. Tickets are $2.00 in advance and $2.50 at the door, Sellers may bring their own ta- bles or rent a table for $2.00. There Is plenty of space and lots of free parking. Prizes include a Kenwood TS-ISOS, an I com 3AT, and an loom 2AT, A 16KTRS'80 Model III will be raffled at $2.00 per chance. Talk-in on 146.04/ .64. For more details, contact CFARC, PO Box 6, Cuyahoga Falls OH 44222, or phone K8JSL at (216)-923-3630.
LfVONIA Ml FEB2S
The Livonia Amateur Radio Club will hold its 12th annual LARC Swap 'n Shop on Sunday, February 28, 1982, from 8:00 am
t^See List of Adv&rtis&rs on page 114
to 4:00 pm at Churchill High School, Livonia Ml. There will be plenty of tables, door prizes, re* freshments, and free parking. Talk-in on 146.52. Reserved ta* ble space of 12- foot minimum is available. For further informa- tion, send an SASE (4 x 9) to Neil Coffin WA8GWU c/o Livo- nia Amateur Radio Club, PO Box 2111, Livonia Ml 48151,
PHILADELPHIA PA MAR 7
The Penn Wireless Associa- tion, Inc., will hold its Tradefest '82 on Sunday, March 7, 1982, at the National Guard Armory, Southampton Road and Roose- velt Boulevard (Rte 1), 2 miles south of exit 28 on the Penn- sylvania Turnpike, Philadelphia PA. General admission Is $3.00 and a 6'x8' seller's space is $5.00 (bring table) with an addi- tional $3.00 for a power connec- tion (limited number). There will be prizes, displays, refresh- ments, rest areas, and surpris- es. Talk-in on 146.115/.715 and ,52, For additional information, contact Mark J. Pierson KB3NE, PO Box 734, Langhorne PA 19047.
WINCHESTER IN MAR 14
The Randolph Amateur Radio Association will hold its 3rd an- nual hamfest on Sunday, March 14, 1982, from 8:00 am to 5:00 pm at the National Guard Armory, Winchester IN. Tickets are $2.00 \n advance anf^ $3.00 at the door. Table space Is $2.50 and table space with table is $5.00. Setup times are 6:00 pm to 8:00 pm on Saturday and 6:00 am to 8:00 am on Sunday. For reserva- tions or additional information, contact RARA, PO Box 203, Win- chester IN, or phone W9VJX at (317)'584'9361.
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73 Magazine * February, 1962 49
The Father of FM
the tragic story of Major E. H. Armstrong
teanne H^mfnond
Atop the Palisades at Alpine, New lersey, across the Hudson River from Yonkers, stands a tail
1 *
i g^^— --
Armstrong if} WW I uniform. (Photo by Bradley B. Hammond)
50 73 Magazine • February, 1982
Armstrong's radio tower atop the Palisades at Alpine, New lersey, as seen from Yonkers. (Photo by leanne Hammond)
three-armed tower. It is ac- cepted as part of the land- scape by those who five on the river's east bank and is seen daily by thousands of commuters on Conrail's Hudson Division trains, yet few know what this tower is or how it has affected their lives.
The tower and its ac- companying radio station were built in 1938 at a cost of over $300,000 by Edwin Howard Armstrong, pioneer radio inventor, to demon- strate the superiority of his new system of radio broad- casting-frequency mod- ulation (FM). After Pro- methean battles with the broadcasting industry, which fought to preserve its investment in the estab- lished system (amplitude mod- ulation—AM), FM was finally accepted and today is the preferred system in radio, the required sound in TV, and the basis for mobile radio, microwave relay, and space communications.
As fittle known as the sig- nificance of the tower is the man who built it. Armstrong was born in New York City in 1890. When he was twelve years old, the family moved to 1032 Warburton Avenue — known to family and friends simpfy as "1032" -in Yonkers. The house, which still stands just up from the Greystone railroad station, was de- clared an historical land- mark in 1 978 by the Yonkers Historical Society.
Next door, on the north side of the house at the cor- ner of Odell Avenue, was 1040 Warburton Avenue, the home of Armstrong's maternal grandparents. The members of the two fam- ilies were a gregarious lot, and Howard's childhood was a happy one filled with large gatherings of rel- atives, many of whom were teachers. Learning was prized. "Quick, boy! How much is nine times five.
Howard Armstrong, about six years old, with his sister, Ethel
minus three, divided by six, times two, plus nine?' His great uncle, Charles Hart- man, principal of New York
City Public School 160, would quiz his nephew to
encourage his mental agili- ty.
When Howard was four- teen years old, his father, who was American repre- sentative of the Oxford
1032 Warburton Avenue, Armstrong's boyhood home in Yonkers. His earliest experiments were carried out in the cupola on the third floor.
73 Magazine • February, 1982 51
I
His bedroom/workroom in the cupola looked out on the spot on the Palisades where his radio station would later be (Photo by Bradley B. Hammond)
UniversitY Press, bought him (on one of his yearly trips to London) a book, The Boys Book of Inventions. Reading of Guglielmo Mar- conTs sending of the first wireless message across the Atlantic so excited his imag- ination that he determined then and there to become an inventor.
In his attic room in the cupola overlooking the Hudson River, Howard Armstrong began tinkering with radio. In those days, broadcast sound consisted of Morse code signals picked up with earphones. The incipient young invert- tor set out to make them louder. He was dogged in his search and developed at this early age a capacity for infinite patience in his ex- periments which was to mark his life's work. "Genius is one percent in* spiration and ninety-nine percent perspiration/' he
«
I
J
Armstrong consiructed /arge anlenna kites which he flew from the upper stories of '103T" in an attempt to improve
reception.
52 73 Magazine • February J9B2
The young inventor at work on the '1032^' pole.
used to say in later years, quoting Thomas Edison.
Armstrong explored many paths in his attempts to strengthen the sound. Reaching up into the air to better catch the broadcast signals, he flew from the up- per stories of 1032 large an- tenna kites which he had built with the help of his Yonkers friend, Bill Russell. He built a 125-foot antenna pole, the tallest in the area, in the south yard. His youn- ger sister, Edith T'Cricket'l helped in the construction, holding the guy wires and handing him buckets of paint as he swung aloft in a boatswain's chair. Neigh- bors watched with awe and apprehension. His mother, however, had complete faith in her son. When a neighbor telephoned to say that Howard was at the top of the pole and it made her nervous to watch, "Don't look, then/' was her confi- dent reply.
Howard attended Public School 6 in Yonkers and Yonkers High School, and went on from there to Co- lumbia University, com- muting on a red motorcycle his father had given him as a high school graduation present. His interest in radio led him to the study of elec- trical engineering.
In his junior year at Co- lumbia, Armstrong's dil- igent search for improved radio reception paid off. He invented the regenerative- oscillating, or feedback, cir- cuit which greatly in- creased radio signals, made them loud enough to be heard across a room and led the way to transatlantic radio telegraphy. His sister^ Ethel, remembers vividly the night it happened. ''Mother and Father were out playing cards with friends and I was fast asleep in bed. All of a sudden Howard burst into my room carrying a small box. He danced round and round the room shouting, 'Tve
Major Armstrong's sister, Ethel, and her husband, Bradley Hannmond, listen to a crystal set With their evening meai around 1920. [Photo by Bradley B. Hamniond)
done it! Kve done it!' 1 real- ly don't remember the sounds from the box. I was so groggy, just having been wakened, I just remember how excited he was/'
Later, another inventor, Lee DeForest, challenged Armstrong's priority for this discovery and the issue was twice argued before the US Supreme Court — which
found in De Forest's favor. However, the scientific community has always credited Armstrong for the invention and he received a gold medal for it from the
Thomas j. Styles, Armstrong's longtime associate, Ethel Howard, and his mother. (Photo by Bradley B. Hammond)
73 Magazine • February, 1982 S3
Billboard in Yonkers dating around 1921. [Photo by Bradley B. Hammond)
Institute of Radio Engi- neers. Years later, the report accompanying the presen- tation to him of the Franklin Medal, by the Franklin tn-
stitute in Philadelphia, also credited him with the inven- tion of the regenerative cir- cuit.
After graduation from Columbia in 1913, Arm- strong worked as an inr structor at the college. When the US entered the war in 1917, he Joined the Army Signal Corps and rose to the rank of Major— his preferred title for the rest of his life. While in the service, he invented the super- heterodyne circuit which amplified even further the sound of radio transmis- sion. This invention brought him into contact with David Sarnoff, who later became President of Radio Corpora- tion of America and whose bright and attractive secre- tary, Marion Maclnnis, he later married.
After the war, Armstrong returned to Columbia where he worked as an as- sistant to Professor Michael I. Pupin, famed physicist and inventor. When Pupin
Armstrong and his wife, Marion, by the "1032" pote. (Photo by Bradley B. Hannnnond)
54 73 Magazine • February, 1982
Close-up of the tower. (Photo by Bradley B. Hammond)
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In 1923, to celebrate the opening of New York's first radio station — and to impress his fiancee — Armstrong cavorted atop the new WjZ transmitter tower, (Photo by George Burghard]
died, Armstrong took over his professorship and, fi- nancing his own research — his inventions had by now made him wealthy — con- centrated on the eiimina- tion of static.
In 1933, Armstrong se- cured four patents which were to be the basis for fre- quency modulation. This was an entirely new system of broadcasting. Unlike amplitude modulation which varies the amplitude or power of radio waves to transmit sound, frequency modulation varies the num* ber of waves per second over a wide band of fre- quencies. As static is trans- mitted by amplitude modu- lation and cannot break in- to the wide band of fre- quencies of frequency modulation, the latter is virtually static-free. Arm-
strong, who enjoyed apho- risms, liked to quote defeat- ists who said, ''Static, like the poor, will always be with us/' He proved them wrong.
The first public broad- cast of FM was made in 1935 from the home of his friend C.R* (Randy) Runyon at 544 North Broadway in Yonkers. Runyon was a ham who operated under the call letters W2AG and broadcast from a tower in the yard of his house. The tower and the house are no longer standing. The Run- yon living room served as a studio for a demonstration of different kinds of sound that were broadcast to a meeting of the Institute of Radio Engineers at the Engi- neer's Building on West 39th Street in New York City, Water was poured, paper
Armstrong receives the Meda! of a Chevalier de la Legion
d'Honneur for his contributions to wartime wireless, from General Ferrie, head of French militarY communications.
was crumpled, and live and recorded music were beamed from the Runyon tower to the audience forty miles away.
Although the engineers marveled at the fidelity of the sound, FM did not im- mediately take off and it would be some time before it would become a commer- cial success. "If you build a better mousetrap the world doesn't necessarily beat a path to your door/' Arm- strong said ruefully in later years as he fought for the acceptance of his new sys- tem of broadcasting. As a matter of fact, FM was so revolutionary that an entire industry had to scrap its hardware and start over before its potential could be realized. Understand-
ably, the establishment was less than enthusiastic at the prospect
However, for several years RCA gave Armstrong experimental broadcast privileges in its studio at the top of the Empire State Building But in 1937, say- ing that they wished to de- vote the space to the de- velopment of TV, they asked Armstrong to with- draw.
More determined than ever to prove the superior- ity of FM, Armstrong built his own station in Alpine, New Jersey. The site he chose had been visible to him as a boy from his attic cupola at 1032, and it served his purpose well. It was one of the highest
56 73 Magazine • February, 1982
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points in the region and had unobstfLTCted space around it for the broadcast of the
station's signal.
Programs originating with WQXR in New York
City were transmitted by wire to Alpine and broad* cast first under the call let- ters W2XMN and later, WE2XCC. Today, the sta^ tion is owned by UA Colum- bia Cabtevision Company of Oakland, New Jersey, and is operated for closed circuit TV transmission.
During the Second World War; Armstrong devoted himself to military research and allowed the govern- ment to use his patents royalty-free. He received the Medal of Merit for his contributions- After the war, Armstrong turned his attention once more to the promotion of frequency modulation. He saw it grow in popularity as a broadcasting medium as more FM stations went on the air and more FM sets were sold to receive the programs. However, few outside the industry had ever heard of Edwin Howard Armstrong — the man who invented it Fur- thermore, manufacturers began to build and sell FM equipment ignoring his pat* ents. Goaded perhaps by the bitter memory of losing
Armstror}g at his desk at W2XMN. 58 73Magazine • Februafy, 1982
hfs regenerative patent years before, Armstrong be- came embroiled in twenty- one infringement actions to adjudicate hts FM patents. Battling giant corporations with batteries of lawyers used up his resources. Final- ly, in 1954, ill, disillusioned, and his fortune gone, Arm- strong took his own life.
After his death, his wid- ow, Marion, set out to finish what he had started. She continued the lawsuits, sit- ting in the courtroom each day following the argu- ments and watching as tes- timony was given. Her first victory, over RCA in 1954, gave her funds to continue the other suits. In 1967, with the victory over Motorola, she had won all twenty-one and established clearly and decisively that Edwin Howard Armstrong was the inventor of frequency mod- ulation.
Today, the Alpine tower stands as a monument to the brilliant man whose iri- ventions touch our lives every day. His contribu- tions are perhaps best summed up by Lawrence Lessing in his biography of Armstrong, Man of High Fidelity (J, B. Lippincott Company, Philadelphia and New York, 1956). "The lone- ly man listening to music in the night, the isolated farm- er hearing nightly the news of the world, the airplane pilot guiding his craft safely through the ocean of the sky, the astronaut now in his capsule gathering in the whispers from space, the earth bound emergency crew contending with some mission of mercy or di- s aster, the army on the move and the man in his armchair, charmed or in- structed for an hour by a great play, a symphony, a speech, a game of ball — all owe a debt to this man who, in some forty years of high fidelity, fashioned the irir struments illimitably ex- tending these powers of hu- man communication."B
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^ m
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9^ Daily (603) 883-5005 ^^-S Sunday
TUFTS ELECTRONICS is pleased to introduce our two newly affiliated stores. ARLINGTON RADIO is a new store serving the greater BOSTON area. Their speciality is a new system of CONSIGNED sales with an automatic mark-down every thirty days. BUZZARDS BAY ELECTRONICS is an established electronic supplier serving CAPE COD and the PROVIDENCE area. TUFTS ELECTRONICS will be estab- lishing a few more affiliate stores lo make your shopping m.ore convenient. For details on how to become an affiliate store contact our main office in HUDSON' NH_
1
ARLINGTON RADIO 1301 Massachusetts Ave Arlingtari, Mass 02174 617 648 2097
BUZZARDS BAY ELECTRONICS
19G Main Street
Buzzards Bay, Mass 02532
617-759 3376
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With the completion of our recent move to HUDSON, NH TUFTS ELECTRONICS is ready to bring you more ex- citing innovations. Our complete AMATEUR RADIO CATALOG is again available, packed with DISCOUNTS, PACKAGE DEALS and plenty of those hard to find items? Our catalog is computerized and updated daily to assure you of the best prices and the most up to date information available anywhere. Come visit our NEW MODERN SHOW- ROOM, Tufts Electronics is only 30 minutes for Rte 128 in Boston via Rte 3. With the SAVINGS from our DISCOUNTS plus NO SALES TAX in New Hampshire you'll be smiling all the wayf To make your shopping even more pleasant our new store hours are 9-6 daily and 12-5 on Sundays. Come visit us SOON.
60 73 Magazine • February, 1982
DISCOUNT CATALOG
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73 Magazine • February J982 61
DXPEDrnoNS international
THE WEEKLY DX NEWSLETTER FOR ALL AMATEURS
I =., 4
52 WKS
$28 (US) $40 (US)
N. AMERICA ALL OTHERS
Name
^
r
A
.^A
il^''*
Address
City.
SI.
Zip
DXI, 999 WILDWOOD RD,. WAYCROSS, GA. 31501
A TRUE STATEOFTHE-ART COMMUNICATIONS TERMINAL!
NEW
from
INFO-TECH
$1475.00
(with 12" Monitoi)
$180.00
MEMORY EXPANSION BOARD (10K of Memory)
For use by amatetir fadio operators In itue tfansmissiofi aixj receptiao of RTTY (ASCII & Saudol) and Morse code Micrc3proce5sof con- Irolltd with 20K of memofy {BK ROW, dK RAM. 4K video RAM)
User programmable messages, SelCal, WRU, mailboK, real lime clock, large running bLftfsrs, buffers for printers, basic word pro- cessing for on-screen editing, full and half duplex, casserte tape interface. ^Iit screen for mais, ASCII or Baudot prir^tef outputs, au o- Slart, push lo talk, accessory switches, pro t-
Order direct or from these dealers:
(contains mailbox systems)
^ons fof tmUBty baok-yp, many other featufes
The M-500 consists ot jhfee parts: 1 KEYBOARD Connected !o mamframe tjy 5 -ft umbilical cord for maximum operating fSeKi- bilify. Entire system keyboard controHed. 2. MAIN FRAME Houses 95% ot the elec- tronics, all! /O jacks, power supplies, modulator. demodulators. Mela -I fram^ cabinet is tabfe fop or rack mounted.
3 12" VIDEO MONfTDR Htgh quality to insure undistorted video, provrde flexibility for operai- wyq position placement.
Carltof)
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Colfflty Prodiiet&
14903 Beachvlew Ave
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(604^ 535-3056
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For the best deal on
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FEBRUARY FINDS
ICOIVI IC-730 HP Xcvr. regular
$829 special $729.95
(less $40 factory rebate... in effect througli February!]
KENWOOD TR-25G0 new 2-M tiand-held in stock $299.95
HAL CT-2100 Communications Receive Terminal $759.95 KB-21G0 Keyboard $157.95
YAESU FT-208R compact 2M liand held Calll
YAESU FT-708R compact UHF liand-lieid Catll
Quantities limited... all prices subject to change without notice
We always have an excellent assortment of fine used eguip- ment in stock... Come in or call
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5456 North IVIifwaukee Ave. |3l2|631-5t8l|wahintiimDisi
Ir^J
.- *, r
62 73 Magazine • February, 1982
AEA
ADVANCED ELECTRONIC APPLICATIONS, INC.
MM 1 Morse Matic ProgrammabJe ht^yer 16 button pad tailors ufiil to operate as a Memory Keyer, Mofse Trainer, Beacpri, or Automat^c Serial Number Sequencer. Speed 2-99 wpm, 500 charade f memory. Use with all popular paridtes Keys gnd block, calhode or transistor cucuits. 91&vdc @ 350 ma
Regular $1 99-^ - Sate Price $t79^^
IIT-1 Morse Trainer Generates random Mocse characters at pcecjseJy calibrated speeds. 1-99 wpm. One character speed can be seJected with another (sioiwert actual speed. Two levels of difficulty Select five -letter code groups, or random won} length Programmable aytomattc increase m speed from a beginning speed to an ending speed over » duration of .1-99.9 minutes. NormalFy operates in a random mode, but for cfiechmg progress, a 24,000 character answer bookie! is supplied S-lSvdc (§5 200 ma
Regular $99^^ - Sale Price $89^
WT-IP Morse Trainer Portable version of the MT-1. Take it with you! Contains a rechargeable battery pack which provides hours of practfce between charges.. With battery pack and charger.
Regular $139'' - Sale Price $125^'
CK-l "^ "^-^ "^ IIKI
CX*1 Contest keyer. Incorporates virtually afl of the features of the famous MorseMatic, with the ejtcephon of the Trainer and Beacon modes. Two pre set speeds for fast recall and a stepped variable speed control for contesting, 199 wpm. 9 16vdc @ 350 ma
Regular $1 29^' - Sale Price $116^'>
KT-1 Keyer/Tratner. All of the features of the MT-1. However, except for the on /off volume control all other functtons including speed, stdetone pitch, wejghtmg. tune & more, are programmable by using the keypad to address the internal microprocessor Speeil variable, 1-99 wpm. Automatic tune function aJlows two harnfed Amtr luning Trainer provides a sequence of 24,0OD characters with 10 starfine positions or a random point 9'16vdc @ 350 ma
Regular $1 29^^ - Sale Price $t t6»«
MK-1 Morse Keyer Features s^rmlaf to the keyer portion of the KT' 1 without automatic tune tunctron 9^I6vd€ @ 350 ma
Regular $79^'- - Sale Price $74^
Keyer & Trainer ^ccessorie*.
WE-l 20O0 character meniory expansion for MM- L...... S59*'
AC I I2vdc/600ma. AC adaptor for MMl with ME-L 14*^
AC 2 12vdc/350ma. ACadaplor .,.,... 9**
DC-1 Cigarette lighter cord for all except MMP 5**
AEA MBA-RO Basic CW/ASCIl/Baudot Reader, feadsand displays up to 99 wpm CWcopy. 60-67-75.100 Baudot & ASCII at 110 baud [hand typed. 300 baud) 32 character floyrescent display shows up to 5 words af one time 12vdc
Regular Price $299^^ - Sale Price $269^'
ll8A-ftC DeJuxe Reader /Code COriverter Simitar to the MBA-ftO with the addition of 3 code converter which converts Morse CW input (o Baudot or ASCIi TTY output
Regular Price $399^^ - Sate Price $359^^
A£A PFDF Radio Direction Finder Locates signals quickly and accuritely; even those appearing for only a split second. Self-contained computer drives eJectroni cally spun array antenna, computes relative bearing within I"" and shows it on 3 digit Lf 0 display arid 16 LEO nng quadrant display Works with any FM receiver 4ust plug rnto externsl Speaker jack: has self-contained aiMlK) amplifier & speaker. Inclydes 130-180 MHz VHF antenna.
Regular Price $749^^ - Sale Price $674^^
AEA ISOPOLE Ommdirectionai VHF Base ^tion Antenna A tin ique. efficient twin H-waveier^gth design using resonant decoupimg sieeves. Factory tuned, low SWR over entire band |ust assemble and install on I '4" mast Connections and impedarjce matching network weather protected, wind survival 80+ mph Jr. modeis are shorter, ^^wavelength design. All models are UPS shfppahte.
ISOPOLE 144 2 meter base station antenna , , , ,
ISOPOLE 144 Jr. 2 meter base station antenna . ,
ISOPOLE 220 220 MHz base station antenna
ISOPOLE 220 Jr 220 MH^ b^se station antenna
ISOPOLE 450 450 MHz base station antenna (Reg, $69^^) ...... . ,SAU
Afl pricei and ipedficationi. subject to change without nor/ci*
« f q ¥ r
3995
MosterCard
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&
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Our MILWAUKEE Headquarters wilJ answer tfie Nationwide WATS line 1 -800-558-0411 until 8 pm {Milwaukee time). Monday thru Thursday
Call Toll Free: 1-800-558-0411
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Phone (312) 631-5181 Outside ILL. 1-800-621-5802
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AES BRANCH STORES ASSOCIATE STORE
73 Magazine ■ February, 1982 63
mt
Kart T. Thurber, Ir WBFX 117 Faptar Drive Mittbrook AL 36054
The Art of Listening
audio accessories explored
I
A high-quatity station receiver having attributes of acceptable sehctivitY, serjsitivity, stability, image and spurious signal re/ectfoa and accurate readout forms the heart of any installation --amateur or SWL Due to cost considerations, front-panel control space limita- tions, and other factors, not all desirable features can be included. In this article, we look at important audio-related accessories that can be used in tandem with a good set for outstanding performance and versatility. These include proper headphones and speakers, audio filters, and tape recorders. The front-panel phone jack provides the umbilical con- nection for these devices. The Kenwood R-1000 receiver pictured here has one interesting feature of special interest to SWLs: The function switch at upper left controls a timer used to turn on the radio for scheduled listening or to control a recorder through a remote ter* minai (Photo courtesy of Trio-Kenwood Communications, Inc.)
M 73 Magazine • February J 982
In this interesting and high- ly-readable article, WBFX highlights in a casual, non- technical way some impor- tant considerations in choosing key audio acces- sories for your station. Whether a licensed amateur or a serious shortwave lis- tener, we think you will be interested in what he has to say about speakers, head- phones, tape recorders, and filters for the ham shack.
No transceiver or re- ceiver is perfect, and none comes complete with all possible accessories to fill every operating need. The design of such a radio would certainly push the technical state of the art, not to mention that it would most certainly be cost-prohibitive. Various accessories and modifica- tions narrow the gap be- tween needs and reality and allow one to tailor perfor- mance accordingly.
There are many receiver audio add-ons one can build or purchase: external speakers, headphones, tape recorders, audio interfer- ence filters, phone patches, radiotetetype (RTTY) and Morse code readers, slow- scan television (SSTV) view- ers, and monitorscopes, to name but a few perfor- mance-enhancing accesso- ries.
In this article, we will look at construction and se- lection considerations for the first four groups listed above. Our review will high- light a number of commer- cial phone-jack products from the standpoint of their contributions to material reception improvement and making on-the-air oper- ating a more convenient and enjoyable pastime.
Let's begin with the main link between your rig and your ears— the speaker.
Speakers: A Special Breed
Anyone who rates him- self or herself a hi-fi buff knows just how important the speaker is to overall au- dio system performance. Unfortunate (y, the speak* er's importance to receiver or transceiver performance is too often forgotten— by the individual ham and by manufacturers as welL Most amateur equipment made today, whether of domestic or Japanese orh gjn, contains but an under- sized, inexpensive, and in- adequate loudspeaker This results in poor audio perfor- mance from otherwise ex- cellent equipment. Defi- ciencies are magnified when equipment is stacked, since the speaker is normal- ly mounted on the top or bottom of the radio where its output will be muffled by the operating desk or other equipment above or below the radio.
Most radios have provi- sions for using an externa! speaker, and I recommend you use one to help attain
the overall performance
you expect from your set.
Fixed station external speakers. It's a good idea to obtain the matching acces- sory speaker at the time of the receiver or transceiver's purchase. However, you should be able to use al- most any communications speaker as long as the voice coil impedance matches that of your sets output, normally 8 Ohms [4-16 Ohms is the usual range].
Only a commun/caf ions- type speaker should be used, however, as the re- stricted frequency response of these units is optimized for speech reproduction. Hi-fi speakers, though per- haps of superior overall quality, will unduly accen- tuate any low-frequency hum as well as high-fre- quency noise and back- ground hiss.
Of late, I've observed that accessory speakers of* fered by some manufactur- ers are marginal in size and quality; hooking up one of these units will not produce the improvement one would expect from an exter- nal speaker. A possible rem- edy is to scour the next hamfest or swap meet for one of the 8- to 12-inch boat-anchor speakers of the 1950s and 1960s bearing such names as National Hallicrafters, Collins, and Hammarlund. These units, if in good condition (voice coil intact and speaker cone undamaged], will run rings around the 4- to 5-inch jobs seen today. A little clean-up, and possibly a paint job, will do wonders to restore a unit to respecta- bility.
You can "roll your own'' versions of these increas- ingly difficult-to-find ac- cessory speakers, too; your effort will likely be reward- ed with superior speech quality and intelligibility. Send for the catalog of McCee Radio and Electron- ics, 1901 McGee St., Kansas City MO 64108. It's chock
[■•■■■I
An external speaker is a near-must in view of the minimal speaker usual ty provided in most amateur gear produced today. The Kenwood SP-180 shown here is designed for use with the 75-780 series of gear; it has a few "'belts and whistles^' of its own. These include three selectable tone filters and two-channel selectable input The headphone output can be routed through the tone filters, too.
full of speaker and enclo- sure possibilities at moder- ate prices. Select a 6-inch- diameter or greater unit that will handle 5 to 10 Watts of audio power.
For the experimentally inclined brasspounder. Sky- tec offers an unusual de- signed-for-application CW
speaker- This acoustically tuned unit develops virtual- ly single-stgnaf selectivity for excellent Morse recep- tion. The CW-I combines an acoustic filter resonant at about 750 Hz with a loud- speaker in a small enclo- sure; a sleeve in the output opening may be extended
SJi^ytec CW-1 speaker is an unusual device that is expressly designed for receiving CW radiotelegraphy. The unit com- bines an acoustic filter resonant at about 750 Hz with a loudspeaker to closely approximate "single-signal'' selec- tivity. (Photo courtesy of Jim Bowles W6DLCI Skytec)
73 Magazine • February, 1982 65
1*
HDP 1228
Mobile instal fat ions can benefit most of all from a carefully-chosen and proper/ y-rmta//ed external speaker. Built-in speakers found in most HF and VHF/UHF mobile sets are inadequatety sized and positioned to compete with road noise, car sounds, and passenger chatter Inexpensive CB-type units usually work welt or a special ly-designed unit such as this Heathkit^ portable twin speaker can be used. Unit includes a visor mount to help direct sound downward to overcome road noise. (Photo courtesy of the Heath Company]
to varv the resonant fre- quency slightly.
How does it work? In the Skytec speaker, back radia- tion fronn a vertically moLinted loudspeaker near the base is deadened by sound-absorbent materraL A cylindrical sound cham- ber (tube) is coupled to the front of the speaker through only a small hole in a plate that otherwise clos- es the lower end of the tube; the tube's upper end is open to the room. At the frequency at which the chamber length is acousti- cally one quarter wave long, it is resonant and acts as a matching section be- tween the high impedance fto sound) of the small hole at the speaker end and the low impedance to the room of the open end. Audio en- ergy transfer is very effi- cient at this frequency but it falls off sharply off- resonance.
Using this special-pur- pose speaker desired sig- nals can be peaked consid- erably (on the order of about 20 dBl while adja*
cent channel signals still can be heard in the back- ground. This feature allows the band to be conveniently scanned without the need to switch back to the regu- lar station speaker. The speaker can be used in con- junction with standard in- termediate frequency (j-f) filters and narrow-bandpass audio-frequency (af) filters, as well However, the filters must be compatible; that is, bandpasses must be cen- tered on the same frequen- cy. Thus, other filters may or may not be used to ad- vantage with the CW-1, de- pending on whether their peaks may be set such that the audio pitch that results is within the speaker's re- sponse capability.
You also may want to route your radio's output to a remote location such as the workshop, patio, bed- room, or yard. A general- purpose PA type speaker (weatherproof for outdoor use) will usually fill the bill. It's advisable to allow switching between the in- shack speaker and the ex-
tension, and also for sepa- rately controlling the vol- ume on the remote speaker. An FM wireless mtke mod- ule also may be used to broadcast received signals to any standard FM receiver in the home or around the yard — more on this possi- bility later.
You may have noticed that many of the bells and whistles now standard on the latest transceivers and receivers are finding their way into accessories of all kinds. For example, the ex- ternal speaker for my Ken- wood TS-180S is not iust a speaker, but a triple audio filter, audio distribution point, and headphone jack box; it can handle the out- puts of two receivers, or a receiver and a transceiver The two af filters are fixed- tuned and push-button-se- lectable to attenuate either low-frequency (below 400 Hz) or high-frequency (1.5 kHz or 3 kHz up) signals. The headphone output is switchable through the fil- ters, as is the output from either audio source A line- out jack on the rear apron provides a convenient source of filtered audio for RTTY^ SSTV, monitorscope^ and other applications where receiver audio is re- quired.
The speaker's fixed filters can't compete with sophis- ticated "active" audio filters, but can do a good job augmenting existing t-f filtering. The narrowing of the af bandwidth to at- tenuate the noise compo- nent after i-f processing can materially enhance recep- tion.
Speakers for the mobile rig. Practically all mobile amateur transceivers con- tain small internal speakers. The harsh sound and re- stricted size and range of most puts a crimp in the quality of reception of all signals. Although many ra- dios have the speaker in- stalled on the top of the rig so that the driver will hear it
best, most sets aim the speaker downward — the
worst possible direction. The set's full audio output is directed where it is large- ly absorbed by floor mats and carpeting. Even with solid-state equipment, cranking up the audio gain to overcome road noise and passenger conversation can result in microphonic-type squeals from the transceiv- er due to acoustic coupling back through the rig's in- nards.
Thus, even more so than in fixed-station operation, an external speaker is clear- ly desirable. Extension speakers markedly improve intelligibility when posi- tioned and aimed better than the rig's internal speaker and will probably be more efficient than the set's speaker. This fact allows the transceiver's usual 2- to 3- Watt audio stage to be throttled back, resulting in less overall distortion — a real problem with some of the less- weighty mobile rigs, par- ticularly handie-talkies.
A hi-fi speaker, such as that used for automobile F M/ A M/t ape-deck use, should not be used for the same reasons discussed pre* viously. Instead, a 1- to 5-Watt communications- type speaker should be pur- chased, one designed ex- pressly for the speech range, 300 to 3000 Hz or so. An inexpensive source of this kind of speaker is the CB market still flooded with a mass of unsold ac- cessories as well as two-way radios The quality of CBr type units varies all over the spectrum, but with speak- ers sometimes going for $4 to $5 at discount and parts- store sales as well as ham- fests and CB coffee breaks, it's not too much of a risk to try one out. Other sources of quick-and-easy mobile speakers are the small speaker boxes which are a part of many telephone am- plifiers, such as the Radio
66 73 Magazine • February, 1982
SUPER STICK II
2 METER 5/8 WAVE TELESCOPIC ANTENNA
6-9DB
over a Rubber Duck
Available In 95 BNC, TNC, Tempo S-1,
Motorola and F Type Connectors
SUPER STICK
II
BRAND C
BRAND V
PRICE GAIN • CONNECTOR
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ff
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16
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6-9 OB
5-6 08
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BNC-Tempo 5/15-32 TNC-F— 50239
BNC ONLY
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FULLY COLLAPSED
Collapsed is a matched 1/4 Wave Antenna
NA
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Win not trafisJTUt id cDlI^psed position'.
* Measured Field Strength Over Rubber Duck *• Specify Base Type BNC. Tempo, Ect.
The Tuned Antenna Company brings you the Super Stick M for those long hauls with your H,T., plus our 5/8 Wave Antenna may be operaied collapsed with the same operating characteristic of a Rubber Duck Antenna The Super Stick II IS avarlable with Tempo S-1. BNC-TNC-F-PL-259 Bases at a price that is several t>ucks under other 5/8 Wave Antennas, making the Super Stick II the best buy around. See your local dealer for stock. Settle for nathing less than a Super Stick II
FOR DEALER LOCATJON
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SiKket tor £?(tenial Cyrtis memory, random code generator, keytoard, Opfional cattle. $4 9S,
lamtiic operation with squeeze key Dot liash insertion Semi-automatic "hu^*' operation pro- vides autfHBatiL vuis aiMl manual dast)6S.
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73 Magazine * February J982 67
Shack 43-230 and similar units. Though small, these units seem to be adequate for casual FM-style mobile work. Old police or taxicab speakers in good condition also can be used.
For the operator who likes to occasionally use his handie-talkie in the family buggy. Heath's HDP-1228 clip-on sun visor speaker is a good bet. The 7-oz. dual speaker has two large mounting fingers (similar to those used on visor mirrors) to hold the speaker onto the visor just above the driver's head. This method of mounting allows opti- mum positioning of the speaker to direct the sound downward where if s need- ed to overcome road noise. An eight-foot-long cord and mini-plug allow easy con- nection to the HT or any other mobile transceiver. (This item, manufactured by Superex Electronics Corp., may have been dis- continued by Heath, as I haven't seen it advertised in recent catalogs,)
lust about any CB4ype external speaker will yield adequate results. However, there is one new amateur unit on the market that war- rants mention; the Ken- wood SP-40. This is a com- pact, but high-quality, light- weight (.44-lb,) speaker hav- ing a power handling capa- bility of 3 Watts with a fre- quency response of 400 to 5000 Hz. Although speaker size is only 57 mm, the little unit appears to be quite ef- ficient and free of annoying resonances and vibrations that too frequently plague lesser CB counterparts The speaker leg has a magnet so that it easily can be mount- ed on any magnetic sub- stance. If the speaker is to be installed in a location where the magnet can't be used, mounting screws or double-faced adhesive tape also can be used. Some- what on the expensive side [about $25), the unit never- theless represents good
value (I own two, one for each automobile). The speaker's aircraft-instru- ment styling makes it an es- pecially attractive comple- ment to any mobile installa- tion.
Headphones for the Ham Shack
Loudspeakers are great for armchair-copy SSB work and for casual, FM-style op- erating. But there are a number of advantages in owning and using a good set of headphones as an ad- junct to the trusty station speaker.
Many DX signals are too weak and QRM-obscured to be properly copied on a loudspeaker; a good set of phones will be of consider- able value in increasing your ability to pull weak and near-buried signals out of the pack, particularly on CW. Room, household, and outside distractions also will be markedly reduced, allowing maximum concen- tration on the signal being copied. The overall effect of using headphones can be about equivalent to dou- bling received signal strength, when compared with straight loudspeaker listening. This may mean the difference between a solid DX contact and none at all.
A secondary, yet impor- tant, reason for using head- phones is that the phones isolate the ham shack from the rest of the household, whose members may not appreciate the objection- able whistles, squawks, and other noises that are music to the ham's ears. This is especially important when practicing code, since Morse blasting forth at 750 Hz can have a very shrill and unnerving quality that readily penetrates wails, ceilings, and floors — not to mention people! Apart- ment and condo dwellers are well aware of how un- popular Morse can be with the neighbors.
. 0-> .:.:.uB.iuv>X'C°0^:
/ built a small FM rebroadcaster for cord-free headphone monitormg /n my ham shacL The unit shown uses the 100-mW Ramsey FM module, which easily can be tuned to a clear spot on the FM band. Output of the station's TS-WOS, FRC'7, or R-1000 is fed through the Autek Re- search QF-1 audio filter to the FM unit. A pair of lightweight ''radio headphones'' completes the installation.
Communications phone requirements. Many begin- ners start out by appropriat- ing the closest set of stereo hi-fi phones for their rigs, with little thought of wheth- er the unit can do the job. Most decent stereo phones can be used, but because they are designed for high- fidelity reproduction, their wide frequency response may elevate internal receiv- er hum and noise to an ob- jectionable level; also, some lead-switching needs to be done to adapt them for monaural use.
Far better, and a more suitable investment for a lifetime amateur radio ca- reer, is a good pair of com- munications-type head- phones. Such phones wilt boast a relatively narrow frequency response, high sensitivity, and easy physi- cal adjustment. They also will be designed for com- fortable wearing over ex- tended periods, and the ear-
muffs will be effective in isolating the operator from distractions. Several manu- facturers sell communica- tions-type phones, includ- ing Telex, Superex, Radio Shack, and Amplivox. Ma- jor ham gear manufacturers such as Kenwood and Yaesu offer a selection of radio headphones designed to both physically and elec- tronically match their equipment lines.
Several considerations emerge. Input impedance should match the output impedance of the receiver or transceiver's audio stage. In almost all solid-state am- ateur gear this is low imped- ance, in the 4-tCh16-Ohm range; normally, 8-Ohm headphones should be ob- tained, though lower-im- pedance units will probably work nearly as well Some older ham gear was de- signed for high-impedance phones, usually Ik to 5k Ohms, however; imped-
68 73 Magazine • February, 1982
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Call 601-323-5869 for technical infonnation, or der/repair status. Also call 601 323 5869 oitt- side continental USA and tn Mississippi t^ 47
nil B I ENTERPRISES,
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73Magaztne ■ February, 1982 69
A good pair of headphones will last a lifetime of hamming.
Though communications-type phones are usually recom- mended, high-quality stereo headphones are often pre- ferred because they usually sport extra'Soft, oversize cushions and padded, adjustable headbands. An adapter cord or plug would be required to convert a stereo phone such as this Radio Shack unit for monophonic use with your receiver or transceiver. (Photo courtesy of Radio Shack)
ance matching is more criti- cal in such instances. Most military surplus head- phones, often attractive be- cause of their rugged con* struction and oversize ear- muffs, are 500-to-600-Ohm units, though they are sometimes seen in higher- and lowerHmpedance ver- sions.
Sitting in front of a ham rig for many hours at a stretch is fatiguing. Doing this while wearing an un- comfortable set of head- phones, sporting a tight and close-fitting headband, is torturous. For reasons of re- taining one's sanity and a pleasant disposition, it's critically important to pur- chase earphones having good earmuffs; the muffs keep the signal in and dis- tractions out. Thick, but soft flexible pads are what are required; they should be held fairly tightly against the head by the headband's pressure, though not so tightly as to be noticeably uncomfortable. One should be careful in purchasing
used headphones, even !f they're OK electrically, be- cause old earmuffs even- tually become shopworn and stiff, primarily due to their having been soaked in the operator's perspiration. Deterioration of the high- frequency response is the result, along with a reduced isolation ability. Overly large, heavy headphones should be avoided due to the discomfort caused by carrying their weight over an extended period.
Some features to look for include a coiled cord, ir^ dividual headset volume controls, interchangeable or easily-replaceable ear- muffs, type of headband construction (single, dou- ble, padded, etcl and a means of adjusting the headband. These factors may be either pluses or mi- nuses, depending on indi- vidual operator prefer- ences.
I have found that buying headphones is one task that is best done in person, not by mail. It's important to try
out the phones, if possible with the radio with which they will be used, both from the standpoint of equip- ment compatibility and op- erator comfort. All the printed specs in the world are useless if you can't comfortably wear the phones over a long time^ span. If possible, borrow several different phones from friends and check out their suitability in your own station before making your choice.
Except for mobile work, where a single headphone may be worn in conjunction with a boom mike/headset combo, a pair of head- phones is universally used. Since the human hearing system tends to cancel out noise which is applied equally to both ears, adding the second headset allows recognition of signals sever- al dB lower in level than with a single headset. Also, most people do not have equal or symmetrically bal- anced hearing in both ears; dual phones tend to mini- mize this anomaly.
A few headphone operat- ing tips should prove help- ful:
1) Try using a pair of fit- ted earplugs under the headphones. Desired sig- nals will come through the earplugs fairly well, while noise will be suppressed. Using earplugs is particular- ly effective when working on an extremely noisy band for a long stretch. You abo may find fatigue is reduced.
2) Experiment with revers- ing the audio leads to one
headphone. The human ear tries to cancel out noise which is presented irnphase to both ears; swapping the normally in-phase headsets can produce a substantial readability improvement while letting the signal of interest through with mini- mum impediment- If results are favorable, you may wish to install a switch to conveniently reverse phase for routine listening.
3) Learn to "ride gain" on your set's rf and af gain con- trols, avoiding "blasting/' which will have the tempo- rary but undesirable effect of desensitizing the ears. Generally, best CW copy is had by running with the af gain wide open (or nearly so) and working with the rf gain control, keeping levels low enough to avoid receiv- er and headset overloading, A good receiver age system makes doing this a lot easi- er.
4) When operating on CW, carefully adjust the set's main tuning or beat frequency oscillator [bfo, if the set has one) to produce a strong yet pleasant audio tone. Don't opt for a too- low pitch; around 750 Hz is usually about right, give or take 100 Hz, or so.
5) If you're an inveterate SSB contester, consider the
use of a boom mike/head- set combo. This device re- places, or supplements, the transceiver's existing mike and speaker. The boom is attached to the back of one of the headphones and curves around the opera- tor's cheek, thereby posi- tioning the mike directly in front of the mouth for close-talking and essential- ly hands-free operating. A press-tCHtalk [PTT) switch is part of the cord itself, though most boom-mike as- semblies can be 'hot- wired" and a foot-switch used for PTT switching for true hands-off operation. Use a double-headset type for fixed-station operation and ensure that mike and headphone impedances are right for the transceiver or receiver/transmitter pair with which the combo is to be used. Avoid cheap CB- type boom assemblies like the plague!
6) If you want to try cord- free headphone operation, purchase a pair of light- weight, cordless FM radio headphones — the kind that has a built-in FM or AM/FM radio inside the headphone
70 73 Magazine • February, 1982
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73MagazinB • February, 1 982 71
itself— and feed your rig's output to a small wireless FM broadcaster module. Doing this allows true cord- free flexibility in the ham shack by doing away with clumsy, entangling head- phone cords. The setup also has the benefit of allowing one to monitor band or net activity anyplace in the home or yard by tuning in the rebroadcaster on any standard FM receiver. Ram- sey Electronics, 2575 Baird Rd., Penfield NY 14526, sells a simple, SOOfoot- range kit for $335. Food for thought]
Using stereo phones. We have cautioned against us- ing stereo hi-fi headphones in the ham shack, regard- less of their quality and comfortability. Headphones with extremely wide fre- quency response character- istics simply reproduce additional interference, de- tracting from desired sig- nals. Nevertheless, many hams will wish to use a pair of existing stereo phones for reasons of economy or personal preference. Hands- on experimentation will reveal if the pair will, in fact be suitable for use.
Unfortunately, you can't just plug a set of stereo phones into your ham rig. Almost all such head- phones use a SQ-cdlled stan- dard three-conductor (in- cluding ground) plug, one circuit being used for each channel Most amateur equipment uses a two-cir- cuit (including ground) jack for use with monaural com- munications headphones. This fact requires replace- ment of the headphone's 3-circuit plug with a single circuit plug and the paralleling of the two separate leads so that the receiver's output will be fed to both headset units. Alter- nately, the stereo head- phone's plug can be left in- tact and an adapter pur- chased or fabricated to convert the stereo-config- ured cord to monaural use.
Using an adapter has the
advantage of allowing the headset to be used as a stereo unit whenever de- sired, without making fur- ther wiring changes.
If you do purchase a set of stereo headphones to use with your ham rig, con- sider a suitable pair that has an internal ''stereo-mono'' switch. This feature allevi- ates the need for an adapter plug. I own a Calrad 15-135 headset that does a credit- able job both in the ham shack and with a small stereo set and it boasts in- dividual earphone volume controls, a coiled cord, and comfortable muffs
IVe indicated that the stereo headphones' wide frequency response may be annoying when used with ham gear. This may be par- ticularly aggravating if you try to use a pair of stereo phones in tandem with an active audio filter, since the filter may emphasize resid- ual ac hum and noise pres- ent in the receiver or trans- ceiver's audio output You can minimize this problem by adding a 50- to 1 50-Ohm, 1/2 -Watt resistor in series with the headphone lead to cut down their low-frequen- cy response and overall sen- sitivity. The exact value to use must be determined by experiment
Tape Recorders
Though by no means necessary accessories, tape recorders represent often
overlooked but very useful station adjuncts. There are countless practical uses for recorders, many of which are suitable for the ham shack. In fact, many ama- teurs wouldn't be without one any more than they would be sans mike or key:
Ham shack apptications.
Small recorders have a wide range of applications in the ham shack that is limited primarily by the in* dividual operator's ingenui- ty and imagination, Record- ers can be used for such di-
v^
Using a high-qualftY pair of communications-type head- phones has several advantages. Switching from speaker to headphones can material ly improve the readabiHty of received signals and keep distracting room noise out Lightvi/eight units with soft cushions that are peaked for communications-range audio are best Low-impedance models, such as the Yaesu headset shown here, are suitable for most modern solid*state receivers and transceivefs. (Photo courtesy of Yaesu Electronics Corporation)
2] Signal reporting. An- other common use is to pro- vide ''live'' signal reporting to others, Most hams are genuinely surprised to learn how they really sound over the air, particularly at a far- distant location. They are usually highly appreciative of an offer to play back their signal to them as much more meaningful than a simple readability- and-strength report If you make a practice of pro- viding on-the-air playback, keep the engineering prac- tice up to snuff; hardwire the connections (no mikes placed up against the set's speaker), and ensure that your wiring arrangements permit professional switch- ing between mike and re- corder. Random bleeps and fast-forward monkeychat- ter are not well received over the air A recorder with an accurate tape counter is a near-must.
3} Transmitted signal quality checking. A good
verse purposes as recoromg DX and other important contacts, verifying trans- mitted audio quality, re- cording messages and traf- fic, code practice, making short CQ and other trans- mission tapes, signal report- ing, and SSTV signal orrgi* nation, to name but a few popular uses. Let's look at some of these:
1) Taping contacts. This represents the most com- mon, obvious use of the re- corder. The machine is sim- ply connected to the receiv- er's output jack, either through a Y-plug across the speaker or, in some sets, to an auxiliary tape-output jack- The tapes made can serve as documentation for exceptionally rare QSOs and as a logging aid in fast- paced DXing and contest work. (In the latter applica- tion, a reference time is re- corded at the beginning of the tape so that log entry times can be conveniently determined.)
72 73 Magazine • February J982
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Gi¥es you cnsp clear, hum-fme audio wh^cti ts wtfat {^hone patehir^ is all aboui Use automaUc VOX or mafiual push to talk.
VU meter monitors telBptione line levels. Lets you adjust nijll control for maximum Isolation between receiver and transmitter.
Separate transmitter and receiver gain conlrols eltmmate readjustmq ng's controls
Function iwitcti: OFF (or normal operation. ON connects riQ to plioae Irne for f»3tching, NULL swit€ties VU meter to adjust for nult.
Simple 2 cable instaiafion (plus phone line) when rig has patc^ in-patch out jacks. Connects easily to any ng RFI filters, PC board construc- tion eliminate RF teedbacN.
Phono jacks for patch-m patcti out, speaker, microphone. Screw terminals for phone lines. ^
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im what phonm patching is sH about and MFJ has rt.
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73 Magazine • February, 1982 73
The uses for a tape recorder in the ham shack are legion: tap- ing QSOs, CQs, code practice, traffic for relay, etc. The recorder is probably of most use to the SSTV enthusiast in editing programs and recording QSOs— though recorders for SSTV work must be a cut above the average home-typ^ cassette. The Sony C-104, shown above, is ideal for these purposes.
way to find out how your own signals sound is by us- ing your recorder to tape them. You will need an aux- iliary receiver for the pur- pose, one whose antenna can be disconnected or which has an attenuator to eliminate front-end over- load by your own signal. You can record your actual on-the-air transmissions and QSOs, of course, but if you do any extensive "hello. . . testing" for the specific pur- pose of making a tape check, be sure to use a dum- my load rather than radiat- ing a signal.
4) Code practice. You easily can make custom code-practice tapes using your key, keyer, audio oscil- lator, and/or keying moni- tor in your transceiver or transmitter to feed the re-
corder's input. If you have an open-reel machine, you can in most cases vary the recorder's speed in a 2:1 ratio, that is from 1-7/8 to 3-3/4 ips, or from 3-3/4 to 7 ips- This capability allows code tapes recorded for the level of instruction desired (audio pitch will change, naturally). The recorder also can be used to tape on- the-air code practice ses* sions regularly broadcast by WlAW, the ARRL sta- tion at Newington, Connect- icut for later playback and practice>
5) Traffic handling. Using a recorder as a running backup in traffic handling is a good idea practiced by many experienced brass* pounders. If you handle a great deal of traffic, you know that a telephone call
or other unwanted interrup- tion can make you miss part of a message or cause you to hold up your net while you get d ''fill." Using the recorder, you can effective- ly tape your own fills.
6) Taping CQs and other transmissions. There is nothing wrong with prere- cording phone CQs, if the practice isn't overdone and technical quality is main- tained. For the most part, tape-recorded CQs are not necessary, and those using them often sound a bit silly. However, for contesting and some DX work, there ate time-saving possibilities. A related application lies in making extended antenna adjustments and TVI check- ing. Since radiating an un- modulated carrier is illegal (except for short periods), you may want to prerecord a signal which can be played through your trans- mitter again and again. For both these applications, special continuous-loop tapes are available; these come in various lengths to fit the desired transmission message length. Again, the watchword is modera- tion—don't overdo a good thing!
7) SSTV recording and play back. The tape record- er is a "must" for the SSTVer, who finds a wide range of specialized ap- plications. These include generation of gray scale, test pattern, and other reference signals; im- mediate playback of the other fellow's over-the-air picture; and building a li- brary of interesting pro- grams from two-way con- tacts. By far the most im- portant use is in prerecord- ing one's own "programs'" for later broadcast, This allows for careful prepara- tion and capturing of art- work and photography, tape editing, and review. The judicious use of a sinrv pie tape machine has en- abled many SSTVers to pro- duce very smooth, interest-
ing and professional-quality
program material that's a pleasure to watch,
8) Computer interface. Small cassette recorders provide the basic means of programming home-type microcomputers If you're equipped with a microcom- puter with an electronic RTTY and/or CW interface, the recorder provides the means to set up the com- puter for RTTY or Morse transmission and reception, and it also serves other an- cillary functions. For exam- ple, in the author's Macro- tronics M^650/PET 2001 system, the recorder is used to prerecord messages for later transmission and to record received messages. So-called "brag tapes" and artwork can be stored on the tapes and exchanged with others.
Besides these specific uses, it's often handy to use a tape recorder to verbally document equipment set- tings and alterations, meter readings, and test results. The work being done is de- scribed as you're doing it with the recorder doing the "writing." Subsequent play- back of the tape, and writ- ten transcription to a notebook or log if required, may be helpful in inter- preting and analyzing re- sults and in learning from past mistakes.
Technical considerations. Authentic high-fidelity sound reproduction isn't a necessity in a ham shack recorder, though a few re- quirements do exist. The recorder should be of rea- sonably good quality [not a child's toy, to be sure), feature low distortion, have an auxiliary input for direct connection to the receiver's speaker, and include a recording level meter and tape counter. A "pause" or "edit" control is also a desirable feature. Re- quirements are tighter if the unit is going to be used to record SSTV signals or in* terface with a microcom-
74 73 Magazine • February. 1962
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TRSaO Modalt I iitd 111 CW Transceive pr(»' gram and interface lets you send and receFve CW. No modilications to rtg or computer,
Tri*Split screen lor receive, transmit, message index. On screen transmit/receive "LEOs", trans- mit speed indicator. "FiSt Fixer."
TRANSMIT: 3295 cliaracter (or more) buffer. Preload buffer while feces vmg Transmit wfien ready Ten 199 character memories. Repeat/link memories. Erase chatacter, buffer screen. 12-55 WPM, Store 2200 cbamcters for gfoup practrce.
BECEIV£: Adjustable ^T\s\ Fmt" helps to copy poorly sent CW, Self sdiustmg to tOO WPM, Re turns lo receive when Iransmit buffer is empty. Store Lip to 5 screens of received CW.
HARDWARE INTERFACE: Pfugs between rig and compjter, Moise limiter, 4 pole active band- pass filter, post detection filter, tracking compa- ralor. Keys tube or solid state rigs. Tunmg. trans mil. ON LEOs. 6?(1V4?t3 inct»es. Aluminum cabinet
95
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Enjoy CW. See deafer or call MFj today.
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Call 601 323 5869 for technical intormation, or- der/repaif status. Also cail 601 323-5869 outside ccntinental USA and in IMisslssippi, 1^47
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Box 494. Mississippi State, MS 39762
for your TRS-80
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LEARN
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Code Class is a machine language progrsm designed to teach the beginning Ham to copy and send Morse code. It is very simple to use and exgeptionally effective. With Code Class you will be ready for your FCC license exam in no time* Each o1 the lessons contains onty 4 characters and may be repeated as often as you wish. Lessons combine doth easy and hard characters so you learn the whole alphabet. Also, for a greater challenge, the cfiaracters learned in previous lessons may be included in the currenl lesson. Of course, the speed may be changed at any time without interrupting the lesson.
PRACTICE
FOR LICENSE UPGRADE
The code practice portion of Code Class is designed to help you increase your speed and accuracy as simply as possible. You will be able to practice copying random words, ran- dom characters or random callsigns. After each page of text the program stops to let you check your accuracy. You may then try the same page again or a new page. The sp^ed is always displayed and is adjustable at any time, even in the middle of a page^ And Changing the speed does not mteirupt tJie character flow.
RECEIVE
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Code Class helps you learn to send clean, correct Morse Code. When coupled with a Macrotronics Ham interface listed below, Code Class will copy your handsent code. Warning, this might hurt your ego, but it will quickly improve your fist. Code Class even displays your sending speed. Requires a TRS-80 Model I f16K, level II BASICS or Model III (16K, level IN BASICJ. To receive handsent code attach a Morse key and any Macrotronics Ham interface IM80. Me3, CM80, CM83. TM80. TM83 or Ter mi nail K Add any audio amplifier for super sound effects. Disk S39, Cassette $!^. Specify (VIodei I or III,
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73 Magazine • February, 1982 75
puter; in these cases, a top- qua! ity recorder having low wow and flutter should be selected Other desirable, though not absolutely es- sential, features include a monitoring and/or auxiliary speaker jack, public ad- dress (PA) mode, automatic shutoff or track reverse, and fast forward and re- verse capability A mono- phonic unit is fine; there is little advantage in using a stereo unit.
Several tape formats are suitable: eight-tracic, reel- to-reeL and cassette. The eight-track recorder, oper- ating at 3-3/4 ips, uses 1/4-inch tape in a track con- figuration that allows eight mono channels or four ster- eo channels to be recorded Since the cartridge is ac- tually an endless tape loop, it will run continuously if left to play out Very short length cartridges are avail- able, making this format ex- cellent for phone CQs and even short SSTV "takes." The eight'track format does have its drawbacks, howev- er, in terms of less-than- optimum audio quality, a tendency for tapes to be- come jammed internally, and the objectionable "click" and momentary loss of audio when tracks are switched.
The open-reel recorder is hard to beat for quality. Us distortion figures and fre- quency response are best among the three formats. Various combinations of reel size, tape length, speed, and available acces- sories add up to maximum versatility and flexibility. Recorder mechanical de- sign is relatively straightfor* ward (when compared with eight-track and cassette models), and maintenance is less difficult and costly to perform. However, the open-reel recorder — at least a good one — is ex pen- sive, and tapes are not as convenient to use as in the other two formats, manual tape threading being re- quired on most models
Tape recorders fmd many useful applkattons in the harr} ^hack. A growing use h connec- tion with digital microcomputers, where they are used for loading and recording of cassette programs and data. Radiotetetype (RTTY) and Morse code interfaces are available from several sources for popular home computers such as the Apple, PET, and TRS-80, shown here in addition to the basic program-hading function, the recorder can be used to digital- ty record on-the-air transmissions and to prerecord outgoing messages (including ''brag tapes''} fof later broadcast (Photo courtesy of Radio Shack]
The cassette machine is the most popular for ham shack use today, for rea- sons of relatively low cost, operating convenience, and steadily increasing quality. The cost of a small cassette unit is certainly not pro- hibitive, with usable ma- chines available for as little as $25 to $30. Even high- quality monophonic por- tables come in at less than $100 The ever-increasing popularity of cassette ma- chines is due in large mea- sure to the ease with which tapes can be selected, load- ed, recorded, and removed from the recorder, features that are very attractive for station use. Tapes in prac- tically any length can be obtained for recording peri- ods up to 120 minutes or more, using the standard cassette speed of 1-7/8 ips The biggest disadvantages are that cassette editing
isn't practical, the low tape speed mitigates against top quality recording, and ac- curate cueing is difficult. Most portable machines have an audio response that is entirely adequate for ham-band and shortwave signal reproduction, howev- er.
An SSTVer, 1 opted for the Superscope C-104, a very high quality mono por- table that includes such de- sirable features as cueing capability, pause control, nicad operation, built-in condenser mike, PA func- tion, and variable tape speed The front-panel con- trols and meter make it es- pecially convenient for stacking above the station speaker or receiver — you don't have to look down on the recorder to operate it as one must do with most small portables.
Standard front-loading stereo decks offer excellent potential though probably represent an overkill in quality. A stereo deck or recorder obtained at a rea- sonable price could likely be put to good use in the shack, though the second channel would be wasted. The micro-cassette record- ers also offer good possibili- ties. Many of these units are quite small, can be operat- ed vertically, and thus can be sandwiched in between equipment units on the op* erating console.
In using a recorder in your station, you may ex- perience trouble with rf pickup, making it unusable when transmitting. The problem can be acute in solid-state units and comes about because of audio rec- tification of your signal by the set's amplifier stages.
76 73 Magazine • February. 1982
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73 Magazine • February, 1982 77
ERC SL-55 audio filter is said to improve SSB and CW recep- tion under severe conditions. The unit contains three separate filters: independent and continuously-adiustabie bandpass f liters as welt as a fixed tow-pass filter that can be cascaded with the others. The unit generates 1 Watt of au- dio and has an input/output in}pedance of 8 Ohms. (Photo courtesy of Electronic Research Corporation of Virgina)
Simple RF [-preventive mea- sures, such as installing an rf choke and bypass capaci- tor in the recorder's mike and/or auxiliary input leads and bypassing tine audio output leads and ac line, will often do the trick, unless you have a very poor station ground or are using a voltage-fed antenna that produces an inordinate amount of stray rf in the shack.
Various patch cords, con- nectors, switches, and jumpers may be required to conveniently use the re- corder with your equip- ment; these only can be determined after deciding which functions the record- er is to filL Using shielded cable for all audio connec- tions should go a long way in reducing rf feedback, noise, and hum pickup.
Audio Filters
The congestion on the amateur bands has placed a premium on receiver/trans- ceiver selectivity. Simple fixed-bandwidth i-f crystal filters were good enough for the 40s and SOs, but not good enough to adequately handle present-day QRM conditions. Densely-packed and overlapping SSB sta- tions, closely-spaced CW
signals, and RTTY reception through potentially obliter- ating heterodynes demand complex i-f filters or other means of achieving a high level of receiver selectivity.
Many upper-end receiv- ers of 50s and 60s vintage contained special i*f cir-
cuitry using double-conver- sion techniques to allow the operator to peak the de- sired signal or null out an offending one. At the time, the best way to improve se- lectivity on inexpensive re- ceivers was to add an out- board i-f -stage ''Q-multipli- er/' which enabled the op- erator to either peak a de- sired signal or null out an offending one by manipu- lating one of several panel controls. The Q-multiptier (the best-known being Heath's QF-1) was capable of doing a good job, but some practice was required in using it It went out of favor as the once-standard 455 kHz i-f frequency was largely abandoned for high- er and lower i-f frequencies in double-conversion con- figurations. The transition from tube to solid-state de- signs also had a lot to do with the Q-mu!tipUer's de- mise.
The basic means of at- taining the desired amount
of receiver selectivity today is by means of an i-f stage crystal or mechanical filter, Most high-quality transceiv- ers use a filter with a steep shape factor to reduce out- of-passband signals and noise; the same fitter is usually used on transmit. If your receiver or transceiver has provisions for optional i-f filters for reduced-band- width SSB and CW recep- tion, it's a wise investment to obtain them— especially the CW filter. Some manu- facturers^ such as Ken- wood, also offer provision for adding a second (dual) SSB filter assembly to fur- ther sharpen the response curve and improve the i-f stage's signal-to-noise (S/N) ratio Addition of the sec- ond filter also has a benefi- cial effect on transmit, allowing a greater degree of speech compression to be used without a significant increase in sideband splat- ter and resultant band- width.
While most i-f filter ar- rangements don't offer true single-signal reception,
those receivers and trans- ceivers that have provision for shifting the center fre- quency of the i-f crystal filter (variously known as i-f-shift or passband tuning, depending on the manufac- turer) offer additional possi- bilities for minimizing QRM and further improving over- all S/N ratio.
Even in those sets having adequate i-f filtering, the
addition of an audio filter can enhance performance. The audio filter acts in two ways: 1 ) It cuts down on the wideband noise generated by the set's i-f chain, preventing amplification by the sef s audio stages, and 2) it further narrows the receiver's overall response curve, often allowing true single-signal reception. Both characteristics signifi- cantly aid reception when the QRM level is up and when working under weak- signal conditions.
Passive audio filters, A fixed-tuned, passive (norh amplifying) audio fitter can do a great deal to improve the selectivity of a receiver, especially one without an i-f filter; in some inexpen- sive sets, an audio-stage filter is the pnmary selectiv- ity-determining device. Many hams found that war surplus radio range filters inserted in their radios" headphones lead did a good job in separating closely-spaced CW signals, though the filter frequency of most of these units was a bit high-pitched to suit many and receiver tuning and stability became criti- cal when using very narrow bandpass filters.
More sophisticated de- signs have been developed over the years, using large fixed-value inductors to achieve the desired degree of selectivity at audio fre- quencies. The radio hand- books are full of good pas- sive filter designs, especial- ly for use on CW. A particu- larly good one is the six- element L/C CW bandpass filter designed by Ed Weth- erhold W3NQN. It appears on page 8-27 of the 1980 ARRL Radio Amateur's Handbook. Other W3NQN designs appear in the De- cember, 1980, QST Anoth- er practical filter approach is that of Del Crowe! I K6R I L that appeared in the March, 1968, CQ Magazine in his ar- ticle, "Adding CW Selectivi- ty for Transceivers,"
Passive filters are brute- force devices, however; they are lossy — very notice- able if one wants to drive a loudspeaker. Though easy to build, the passive de- vices rely on large, cumber- some and often hard-to-find toroidal inductors, Also, there is no flexibility in set- ting the center frequency and bandpass curve or changing these characteris- tics during operation. A far more satisfactory approach lies in the use of the active audio filter.
78 73 Magazine • FebriraryJ982
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meteorological oceanographic handicapped civil defenae
CONSIDER THE
You know of its reputation in Amateur Radio. But did you know of its world- wide uses in commercial/industrial communications networks? ATR-68Q0's are communicating over land-lines, via satellite, and on HF/VHF radio links all over the world. They're teaching Morse Code on military bases around the country and operating as TELEX & TWX terminals. We offer engineering expertise for your particular require- ment be it Data Encryption, Computer- ized Training or any special interest. ATR-6800 with 9" video monitor and one plug-in Applications Module . . . $2495. Companion MX-80 printer . . . $699. Contact the "REAL-WORLD" at MICROLOG CORP. 4 Professional Drive. Suite 1 19, Gaithersburg, Md. 20760. TEL: (301) 948-5307. TELEX: 908778. You'll be pleasantly surprised.
MICROLOG
INNOVATORS IN DIGITAL COMMUNICATION
t^See if St of Advert tsers on page ? M
73 Magazine • February, t982 79
Active audio filters. The active, or tuned, amplifying audio filter uses RC net- works in conjunction with solid-state amplifiers to synthesize the inductor characteristics. The simu- lated inductance is resonat- ed with a capacitor to pro- duce a tuned'filter effect. What makes this kind of filter so popular with hams is that the filter can be con- structed with variable Q and variable center and cutoff frequencies; this allows convenient front- panel control of the filter's operating characteristics that the operator can precisely tailor to suit his mode of operation, per- sonal preferences, and band conditions.
The current spate of solid-state active filter designs are descendants of the classic National Radio "5electH>|ect" audio filter that was immensely popu- tar about 30 years ago. This tube-type accessory was a handy, quick-and-dirty sup- plement to a receiver hav- ing little real setectivity. Present-day active filters of- fer a number of spec J at J zed features that make them of great Interest to both CW and SSB operators.
An active audio filter can be built from one of the many designs regularly fea- tured in the ham maga- zines; several are In the Handbook, At least a dozen firms sell these very cost- effective QRM-suppressors that allow even a modest receiver or transceiver to come to life in the selectivi- ty department, particularly on CW. Manufacturers in- clude Autek Research, Kan- tronics, M&M Electronics, Datong, Electronic Re- search Corp of America, Palomar Engineers, MF| Enterprises, and several others.
Typical handbook and commercial designs enable operation on either CW or SSB, though a few less-
expensive filters are for CW-only or SSB-only use. The majority are self-con- tained and include their own power supply or draw power from the receiver or transceiver's accessory jack. Most are connected to the set's audio output jack and contain a small internal audio power amp to direct- ly drive a speaker or head- phones. The filters enable the operator to adjust selec- tivity from a few Hz, for razor-sharp CW perfor- mance, up to a completely flat response. Many have separate high-pass and low- pass operating modes, es- pecially useful on SSB; oth- ers have a deep notch fea- ture that is used to null out an interfering signal or heterodyne without degrad- ing the desired signal A few sophisticated models allow dual (simultaneous) notch- ing and filtering; at least one model contains a built* in noise limiter.
Using the active filter on SSB is a gratifying ex- perience, especially if in
conjunction with a modest set — though top~of-the-line models will benefit as well. By proper control-knob ma- nipulation, if s possible to dramatically improve sig- nal readability under condi- tions of QRM, static, splat- ter, and the like— reducing operator fatigue and mak- ing listening a great deal more pleasant. SWLs, IO- meter AMers, and CB oper- ators should be interested in the capabilities of the ac- tive audio filter, too. Selec- tivity on the crowded AM shortwave and standard broadcast bands is consid- erably improved, and sta- tions just a few kHz apart can be separated with little cross-channel interference.
The real thrill comes when using one of these filters on CW. Used in con- junction with a set's existing CW i-f filter, results can be truly impressive. With the active filter, the desired signal can be peaked with
Palomar Engineers' CW filter connects between the receiver and a set of stereo headphones. There are actually two filters, a narrowband one with an 80-Hz bandwidth
(centered at 800 Hz) and a wideband one that cuts out hum and high frequency interference but passes most of the receiver audio signal. The narrowband signal goes to one ear, the wideband to the other, giving simulated-stereo reception. The effect is to offer a signal ''mrx" that is an /n> provement over either filter alone: The off-frequency signals appear in one headphone, the desired signal in both. The operator's mind concentrates on the desired signal and rejects the interference. Long operating periods are said to be less fatiguing using such an arrangement (Photo courtesy of Palomar Engineers)
an effective bandwidth measured in tens of cycles, even in the presence of close-by strong signals that have managed to bull their way through the radio's i-f strip. Even with a sharp i-f CW filter installed, it's possible to actually tune through the set's i-f pass- band with the audio filter and discover several in- dividual CW signals that can be brought up to solid- copy levels that were un- readable or scarcely detect- able without the filter. Of
course, there is a limit to the
degree of selectivity one can crank in; with too much selectivity, filter ''ringing" becomes objectionable. Al- so, using the notch feature, very pronounced unwanted signal rejection [sometimes 70 dS or more) can be at- tained by proper control manipulation.
Space-age f Uteri ng. A couple of takeoff s on ac* tive filtering techniques have surfaced in recent years. One is the concept of simulated-stereo reception.
SO T3 Magazine • FebriiaryJ982
Same peopU u/tont t^ ^cH€4t,
Introducing the New Loiv Cosi Spectrum SCR-77 Repeaters— 2M, 220 & 440 MHz!
SPECTRUM COMMUNICATIONS
SES11 FM REPEATER
rvioaE
la.avac
^^U t&ANSMlT
• •^tii\.umm-
-Be^iLrtai^cTK'
'V
AC t,tMB ' mil AC |3Cl^WEtl
LQCAC IV1ICI
- ^ -s
15 or 30 Wt xmtrs.
Includes: •Q.aS^V Rcvr. d Pole IF Filter
• Crystals— high stability .0005%
• Local Mic
• Your Cat! programmed into IDer
• Provision for Auto-Switchover to Btry, Pwr.
• Builtnn AC Supply; basic Panel Controls, Spkr, LED Indicators
If you're looking for a new Repeater, but you real- ly don't need (or can't afford) all the features and options on our world famous, 'super deluxe' SCR1000/4000, then our new economy line of SCR77 Repeaters is ideal for youf
These new Repeaters maintain the quality of design, com- ponents and construction which made Spectrum gear famous. However, ail of the "bells & whistles" which you may not need or want have been eliminated— af a large cost sav- ings to yoal The SCR77 is a real "workhorse" basic machine designed for those who want excellent, super reliable perfor- mance year after year— but no fnlfsf ('PL' 12 Pole IF Filter, Ffont End Preselector, and a 30Wt. Transmitter are the only "built-in" options available; but Autopatch, Remote Con- trol, and other equipment can be connected via the rear panel jack)
"Y^ ^ eomfdete (me
caMe , etc,, C^ aJUa^ ^u^atiaHe*
^! ■T.«--\: ^
Of course, if you do want a fuij reaiured/super defuxe repeater, with higher power and a full list of available 'built-in' options, then you want our SCR1000 or 4000 *'Dream Machine", These units will continue to be available for those who want The Ultimate in Repeaters'. SCR77 Pricing (15Wt,): 2M qx 220 MHz, $995.00 Amateur Net. 440MHz, $1150.00. For no 'pfug-in' ID board (Export), deduct $40.00, Oat\ or write today for a data sheet, or to place your order! Sold Factory Direct or through Export Sales Reps only.
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An ^'outboard'' active audio filter can yield surprising per- formance benefits in conjunction with even the most ex- pensive receiving equipment Assuming such a filter is used witti a receiver or transceiver having reasonably good i-f selectivity wrth good "skirts/" weak and QRM-plagued SSB signals can be made to ''jump out of the noise'' in many cases. And in the sharpest modes, several CW signals may be copied within the set's passbandand tuned in separately. Autek filter shown here is based on a design pioneered by the firm in 1972, (Photo courtesy of Autek Research)
described by Max Blumer WA1MKP in his October, 1974, Ham Radio article, "Enhancing CW Reception Through a Simulated Stereo Technique." In this ap- proach, an active filter is used. Unprocessed receiver audio is fed to one ear, and filtered (processed) audio is fed to the other ear. This technique allows v^u to read slightly off-frequency CW stations white simulta- neously hearing the desired signal, in the clear, in the other ear. The brain does the ultimate filtering — it "hears" all the signals, but the processed signal stands out so f idly, with the others mentally rejected. The bot- tom line is that the filter allows greatly improved reception of the desired signal, but also allows you to hear off-frequency re- plies to your CQs; it's also easier to scan the band us- ing the simulated-stereo technique. A stereo head- phone is required for this type of filter, which is of- fered commercially by both Palomar Engineers and MFJ.
Especially interesting is the automatic-tracking au- dio filter offered by Da- tong. In addition to some impressive narrowband tun*
82 73 Magazine • February, 1982
ing capabilities, the FL-1 frequency-agile audio filter features fast automatic sup- pression of interfering het- erodynes in the range of 280 to 3000 Hz by means of its sea rch-lock-and- track notch fitter. The tracking notch can be left in the cir- cuit with no audible effect until a whistle appears, the circuit then goes after it and will suppress it within 1 second.
How does it work? Two phase-sensitive detectors control signals used for automatic tuning. One pro- duces a voltage propor- tional to the degree of mi stun ing, and the other produces a logic level in- dicating the presence of a signal within the filter pass- band In the absence of such a signal, the integrator becomes a sweep genera- tor. But when a signal is detected, the sweep stops, the unit's lock lamp il- luminates, and the integra- tor becomes part of an au- tomatic frequency control (afc) negative feedback loop. The filter then re- mains locked to the "caf>- tured" signal and will track it, if required, throughout the filter's range of 280 to 3000 Hz. This capability al- ows the routine use of an
extremely narrow (20 Hz) notch which does not no- ticeably affect received sig- nals and which would be nearly impossible to manu- ally tune and maintain in tune. Of interest to CW ops. an attenuated afc voltage is also used in the manual tun- ing mode to allow the filter to automatically track drift- ing CW signals over a 100-Hz range!
Whether you opt for a simple or complex filter, youH likely be glad you made the investment. Dol- lar-for-dollar, an audio filter is one of the best accessory aids you can buy for your receiver or transceiver,
Wrap4Jp
In this article, we have discussed a wide range of basic, yet important, phone- jack accessories: headphones, speakers, re-
corders, and filters, with a view to obtaining maximum usefulness from dollars spent on station equipment For most hams, this group of reception accessories probably represents the most important initial ac- cessory investment- For this reason, and for space limi- tations, we've not discussed exotica which might other- wise fit the article's "phone- jack'' scope, such as SSTV viewers, RTTY/Morse de- coders, monitorscopes, phone patches, and the like. We'll reserve discussion on these "second-leveT' ac- cessories until a later time. In the final analysis, you must decide which, if any, accessories to build or buy. Hopefully, the criteria, sug- gestions, and observations provided in this article will help make your decisions both logical and wise.l
Further Reading
The following reference sources provide addttionai infor- mation, theory, and construction details. Several contain fur^ ther references to other information sources you may wish to consult:
Jim Ashe. *'How to Use Hi-Fi Headphones," Poputar Elec- tronics, July, 1972.
Ronald M, Benrey, ''Adapting Stereo Phones for Hams/' Efec- trorrics illustrated, May, 1972.
Fred Blechman K6UGT, ''How to Use a Tape Recorder In Your Shack," Electronics Illustrated, July, 1962.
Max Blumer WAIMKP, '^Enhancing CW Reception Through a Simulated Stereo Teohnique,'* Harr\ Radio, October, 1974.
Len Buckwalter, "CB Scene" column in Popular Electronics, May, 1974.
Richard Humphrey, "Accessories for Yoyr CB Rig/" Popular Electronics, October, 1973.
Del Crowell K6RIU "Adding CW Selectivity for Transceivers/' CO Magazine, March. 1968,
James R. Kates WB8TCC, ^'Put a Tape Recorder to Work in Your Shack/' CQ Magazine, December, 1977,
The Radio Amateur's Handbook, Newington, Connecticut, American Radio Relay League, 1980 edition.
Charles Schauers W6QLV/4, ^'Ham Clinio" column in CO Magazine, May and June, 1961.
Karl T. Thurber, Jr. W8FX, "Ham Shack Accessories: What You Really Need/' Ham Radio Honzons, December, 1979.
Karl T. Thurber, Jr. W8FX, "Ht^Tech Gear for Hams and SWLs/' Popular Electronics, August, 1980.
William G. Welsh W6DDB. "Headsets and Ham Radio/" 73 Magazine, February, 1972.
Edward E Welherhold W3NQN, **Modern Design of a CW Filter Using 88- and 44-mH Surplus Inductors/* QST, December, 1980.
OSCAR ORBITS
OtCML • OfiBITAI iivoiHAnov r&x mwgjjt
d«CU ff QUITKL lirQiRATll?* FClfe ftWAXr
• Th© Amsat Software Exchange has recently been formed and is now accepting orders. The first program being made available is the orbital prediction program written by Df. Tom Clark W1IWJ, it is available for most popular machine environments, with other ver- sions being developed. Presently available are TRS-80 disk and cas- sette versions. Apple/M diskette. Microsoft BASIC, and PUI-BO. This progrann will accommodate the elliptical orbit tracking required for the Phase III satellites. For complete information on versions available as well as new additions and ordering information, send an SASE to: AMSAT Software Exchange, Sox 338, Ashmore IL 61S12.
• The early months of amateur radio's newest satellite, UoSAT- OSCAR 9, were full of developmental work. The Surrey, England- based ground crew concentrated on generating and relaying to the bird a computer program that will allow the craft to stabilize itself via on-board torquing coils and a gravity gradient boom. Once this is ac- complished, the experimental part of the mission will commence.
• AMSAT, the people who organize ham radio's space communica- tions program, received a "royal boost" from JY1, Jordan's King Hussein. While visiting the US In early November, the King ex- pressed his support to AMSAT President Tom Clark W3IWL
• Although the AMSAT financial picture has been brightened by several large donations, there is still a need for grass-roots support by the entire ham population* You can find out more about AMSAT by writing to: The Radio Amateur Satellite Corporation, PO Box 27, Washington DC 20044,
Information for this column comes from the AMSAT Satel- Me Report.
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WHAT IS AN AUdfO RLTER -^
W^v buy a Dalong audio tiliar wtusfi
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j^^l wMsHes snd notdi itieiTi ■'^^H out i4iiioffiJtteeiiy Wte our B ^ ModeiFLt'' YetMbdeifLi H am *5 also such a good CW filter H V^ thai itiswidi^^yu^eKiby |H ^^ pro(ess«onaMria(fi€ handlers, ^1 # What olher aiidio filler ha^ I^Jr passband edgtis sharper itran 5SB i^iir ciysial f trters and yc\ which can be tsm&a at wiU from 200 lo 35O0 Hz*^ To puii oft itits inclt ouf Msde^ FL3 tees rip ie$§, Ifian 32 op amps plus ^ale-of-the- art pM^te iividRh rfwdutatun technKiuas Two^-pcs^eeipta: liters and a 2-$Kiie|»aii^ notch hhptfiKineboi ai irviepeiideii%tijwabie add up toa koi Ftiore ItHerK} Capabtirty 1^ ^O. FUTV CW ttian you wiiH find in arty oCt¥T auOio tinner" that we^noAr of To answer our question (Hen. an 'audio 'titer' ' can tw almost anything On the oih-er hand, (he phra-Mt " Daiong Aydto Filt^F" 15 ^ loi mote pf«ise IT aiartds Tof staie-of the-art filTenrtg biaci^ed by exlra capabilitv o^lra Itiorough desigh and exira rraality If you need conlirmaljon ask a user*
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Ju$i ^B. <iu^ fwQ diud)^ iiVi^v sefi new siin^^tii ^orwwmv siwor^ t/fitS tfwntion oiralberpniduct^&demanctnneifsconsjcter^loilor some riosons EachD'ier^aLtfVpieoomtmsioiDliedSurKwhcfi'
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73 Magazine • February, 1982 83
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The broadband TH7DX has high performance specifications that meet or exceed
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Write for our technical data report and oonnparative test results.
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86 73 Magazine • February, 1982
Birth of a legend
National Microtech, Inc. introduces Apollo « X9 Satellite Antenna $1995*
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A Dish Antenna Anyone Can Build
no hyperbole, just a parabola
Michael Brown WSDjY 6297 Brown Run Road Middletown OH 4S042
Are you contemplating the challenge of oper- ating on the amateur micro- wave bands? What about getting in on the excitement of receiving satellite TV sig- nals? These and similiar projects usually require a dish-style antenna. You could buy one or, better yet, you can build one. This article will tell you how.
I wanted to put a signal on the 1296-MHz band. To do the job right I needed a dish antenna. I took the plunge at a hamfest, buying
a surplus military job made of spun aluminum, about 6 feet in diameter. It was one of those good deals you can't pass up,
Now my "good deal" sits in the corner collecting dust, waiting to be sold at the next hamfest. I man- aged to get a signal on 1296 using a dish two meters in diameter that 1 built myself. The design is one which uses easily-obtained materi- als and has a total cost of less than $100, Best of all Jt need not be a long, in- volved project. In fact, you can build a dish like mine in a single weekend.
Photos by Tim Daniel HBRK
Photo A. The finished dish is light enough to be moved easi- fy; the author stores his away each winter.
73 Magazine * February, 1962
Some Theory
Before we jump into the details of construction, it would be a good idea to took at the basics of dish design, The dish, resem- bling an oversized child's snow saucer, is a parab- oloid. Its unique geomet- ric properties cause it to collect a beamwidth of energy from a distant source and reflect it to a central point known as the focal point, or focus. Sinni- larly, a signal radiated to- wards the dish from the focus will be effectively ra- diated by the antenna.
The important dimen- sions of a paraboloid are shown in Fig. 1. The reason my ''good deal/' dish turned out to be a piece Of junk was that the relationship be- tween the focal point and the diameter was all wrong.
Known as the f/d ratio, this relationship is very im- portant when it comes time to feed the dish. Experience shows that dishes with f/d ratios of 0.5 and greater can be fed easily with a horn-style array, (My com- mercial dish's f/d ratio was about 0.25 and was difficult to feed.)
The diameter (d) is impor- tant in determining how
much gain the antenna will have. Obviously, a dish 6 feet in diameter will collect more signal than a 3-foot dish. Each time you double the diameter, the gain in- creases by a factor of four (6 dB). The actual gain of a dish depends on its efficien- cy and the frequency it is used on. Assuming a rea- sonable efficiency of 50%, a 2-meter dish should have about 25 dB of gain over a dipole source at 1296 MHz, The 3-dB beamwidth will be about 8 degrees. Fig. 2 shows these relationships.
Once you have chosen the desired diameter, you'll know where the focal point should be to achieve an f/d ratio of about 0.5. In the case of a 2-meter dish, f will be at one meter.
The exact curvature needed to obtain a parabo- loid with the desired focus and diameter can be found using the equation y^ = 4fx. By calculating a number of points for x and y, you'll have an accurate plot of the shape required. Let's try an example for a dish with the focus at one meter: The X value corresponding to the y point of 0.5 is found by solving the equation 0.5^ = 4n)x. A little algebra yields: x = 0.5V[4(1)].
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fig. 1. Dish dimensions. Width (c) is found by solving: f = d'/16c.
Punching the calculator keys, we come up with the answer x = 0.625 meters. Fig. 1 also shows that the total width of the dish, c, is found with the equation f = d^n6c.
That's all there is to de- signing the reflective part of the dish. Now let's look at how to build it For starters, you should be prepared to work with metric measurements of length I found that the use of meters and centimeters helps to ensure accurate results. For noncritical mea- surements, we'll refer to English units.
Once you have a set of x and y values, it is time to fabricate a surface that ac- curately depicts them. Any irregularities will impair the antenna's gain. At 1296 MHz, deviations of up to 1.5 cm are tolerable. As the frequeocy increases, this tolerance decreases. Using care, this dish can be built
with deviations of less than 0,5 cm.
Making the Ribs
The structural elements that give the dish its strength and special shape are eight wooden rtbs. I made mine from scrap 3/4-inch white pine. Each rib was cut from a 40" x 14'* piece. Any available substi- tute should work, provided that it is reasonably light and can be cut to the need- ed shape.
Carefully draw a center line lengthwise. 5 8 cm from one edge of the board, as shown in Fig. 3. Work from this line to lay out a parabola, using the points generated by the y^ = 4f)£ equation. The more points you use, the more accurate your paraboloid will be. Carefully draw a line to connect the points on the inner surface. The outer sur- face should have a shape like the one shown. The
** 30
OUHETCR iM ttCTEffS
Fig. 2. Dish rf/a meter/gam relationship.
lower flat edge will be at the center of the dish, while the upper end will be at the edge, fastened to a ring of aluminum tubing.
After checking the lay- out, the eight ribs can be rough-cut to about 0.2*cm accuracy using a band or saber saw. Final trimming should be done by sand- ing. Be sure to keep the flat edge parallel to the center line.
The ribs are all joined at the dish's center by a 3/4-inch-thick plywood mounting plate like the one shown in Fig. 4 Ribs A and B are mounted first, using 1-1/2Hnch wood screws. All the other ribs must be short- ened to obtain equal inside diameters. Ribs C and D
have 3/8" removed from the inside end. Ribs E, F, C, and H are shortened 3/8" and mitered with two 45* an- gles as shown in Fig. 4(a).
Finally, aft the remain- ing ribs are fastened to the mounting plate, first with glue and then with wood screws.
To add strength to the dish's outer edge, I encir- cled it with 1/2-inch alumi- num tubing. Four six-foot lengths were used. To bend the tubing into a circle, one end is plugged, then the tube is filled with sand and carefully bent into shape. This was easier to accom- plish than 1 thought it would be. An undersized piece of tubing is used for coupling between the sec-
Photo B. A feedhorn can be easily constructed. The pickup is a simple, nnonopole element
73 Magazine • February, 1982 89
Photo C A circular plate holds the reflective screen mg in place at the dish's center.
tions The shaped lengths are fastened to the dish per- imeter with 5-cent con- duit clamps as shown in Fig. 4(b). Since the ribs give the dish its shape, getting the outside circle perfect is not necessary.
Covering the Frame
The next step is to cover your frame with a reflective surface- I used 1/4-inch hardware cloth because it was cheap and avaiIab!e.To make the job easier, I cut the cloth into eight slightly oversized triangles. Staple a triangfe between two ad- joining ribs and then trim the excess outer edge to size. Next, tie-wrap the perimeter to the aluminum tubing using nylon cord
with cable-wrapping tech- nique. Be sure to wear gloves when working with the hardware cloth.
Once all the screen is in place, eight flathead screws are used to hold it on each rib. (The staples are no longer needed and can be removed.) Since eight layers of hardware ctoth overlap at the center, they must be trimmed and then securely fastened beneath a seven-inch diameter disc.
At this stage, all the essential parts of the reflec- tor are complete. Since my dish is going to be mounted in an exposed location, I decided to strengthen it by adding bracing between the ribs about midway from the center. A framework was fastened to the center plate
so that the whole antenna can be bolted to a mast.
Feedhorn Ideas
Because of the f/d rati of 05, the obvious fee choice becomes a horn. The theory behind horn design is not trivial. To make mat- ters worse, there often is a vast difference between a design on paper and one that works The horn shown in Fig, 5 has been field- proven on the 1296-MH2 band by K9KFR and others. Horns of this type have about 8 dB of gain. Other types of feeds can be used; one good source of infor- mation is the RSCB book, VHF-UHF Manual, by Jessop and Evans.
Unless you can find a tin can that meets the dimen- sions shown in Fig. 5, you will need to make one. Us- ing light-weight aluminum stock, I made a cylinder from a 18" X 28,25" piece. Next, a cap is fashioned to fit into one end. Small vee- shaped tabs are bent 90** and rfveted to the cylinder wall. The result is a tube with an inside length of 16" and a diameter of 9".
The location of the tuned element is critical. A type-N connector should be mounted 2" from the rear wall A 1/4-wave driven ele- ment (1.8" of 1/4-inch cop- per tubing or 1/8'' welding
rod) IS adjusted by filing. Using approximately one Watt of power with an in* line wattmeter, file for best vswr Caution: The ham is emitting microwaves; keep hands and eyes away from the opening. Be sure to use hardline for all connec- tions.
It should come as no sur- prise that at this point the
antenna is almost finished. Now the horn is mounted on the antenna frame with four sections of telescoping aluminum tubing.
The exact distance be- tween the dish center and the horn must be found experimentally. The focal point will not be at the horn's outside edge, it will be inside the cylinder To find the exact focus, the dish should be aimed at a signal source and the horn moved up and down until the received signal is at a maximum. If your 1296 receiving gear includes a low-noise amplifier, then one excellent signal source is "sun noise.'' Aim the dish at the sun. and your re* ceiver should give a notice- able output.
The antenna's polarity is determined by the position of the driven element. Rotating the horn 90** changes the antenna from vertical to horizontal or vice versa. When the driven
£ 1/4 in OH O^tn
FLAT ED€E
CENTER LIME
2 \/A tn, OR
2l/4«.0f| Q^9m
4' erf It 1^2 In 00 ALUMINUM TU&E
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Fig, 3. Rib detail. W 73 Magazine * February, 1982
Fig, 4, Assembly of the ribs.
TYPE W CQIVNECTOR
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Fig. 5. Feedhorn design.
element is horizontal relative to the Earth, the
antenna is horizontalfy polarized and is set for 1296-MHz tropo operation. Once the focus and polarity are set, bolt everything into place and start enjoying your new antenna.
Life on 1 296
You might be interested in the rest of my 1296-MHz station. For receiving, I use a preamplifier made with an MRF901 transistor, fol- lowed by a Microwave Module that converts the signal to 28 MHz where an amateur transceiver is used. On transmit, a home-brew
varactor tripler provides 3/4-Watt output on 1296 when driven with a ten- Watt, 432-MHz signal. This may not seem like much power, but I make the most of it by using hardline be- tween the dish and the shack, Thanks to my dish antenna, the 1 296 effort has been a success. The first two contacts were with K9KFR and WA8|HW. each more than 100 miles away. This article is being writ- ten in the winter, and the dish has been stored away, safe from ice and other haz- ards. When warm weather returns, you can be sure that W8DI Y will be back on
Photo D, Building a 1296-MHz dish need not be difficult, but it will require sonne home-brewing.
1296, In the meantime, plans are being made for a much bigger dish and a more powerful transmitter. As you can see, build- ing a dish need not be difficult. This project was the result of a lot of help and ideas from fellow VHF- UHF enthusiasts, including WB8EEX, whose garage proved invaluable, W8ULC, who handled the fancy foot-
work on the tower, and K9KFR, who patiently helped get a feed that worked.
About the only thing that can't be changed is the ba- sic parabolic shape Make the most of the materials that are available in your area; be brave; experiment! If you have questions, please include an SASE. See you on 1296IH
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73 Magazine * February, 1982 91
Richard Christian WA4CVP Rl h Sox 209-W Creota AL 3652S
5. f. (Mitch) Mitcheli, Jr. WA40SR TO Box 973
MobihALSSem
Job's Own LNA
rolling your own takes patience
Yes. it is possible to home-brew a workable LNA (Low Noise Amplifier) for your home-brew satel- lite TV receiver! But to do it, you must have the pa- tience of lob and start with a full head of hair!
We'll let you, the reader, decide as you read the arti- cle just how much patience we have.
In ham radio receiver terms, the LNA is the "front end" of the satellite receiv- er. Commercial units gener- ally have about 40 to 50 dB of gain at 4 GHz. They usu- ally are constructed of one or two stages of CaAsFET
OHAfrTCOMM. UfCs
transistors and several stages of bipolar transistors to achieve the amplifica- tion desired. The CaAsFET transistors are a special type of transistor with a very low noise figure. They get their name from the ma- terial used to achieve the low-noise figure, gallium (Ga) arsenide (As).
This article describes the trials and tribulations that we went through in building the LNA for our satellite-TV receiving system. Although we had access to absolutely no test equipment for 4 GHz until after it was known to be working, we
111914 tOpf
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555
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5«ie
rr
lit
were very successful in get- ting the complete system going. We wish to share our hard-earned information with 73 readers who are considering building their own systems.
First, a tittle history. Our initial attempt to build an LNA used a commercially- available board which, for reasons to be discussed, will be nameless. The board was supposedly designed to work with Nippon Electric Company (NEC) NE21889 GaAsFETs. These FETs are expensive at $103 25 for two, but they have a noise figure of 1.2 dB at 4 GHz.
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73Magaifne • February J 982
So, being the scroungers
that we are, we attempted to substitute cheaper (high- er noise figure) GaAsFETs. The result was two blown FETs that cost $62,50 and two grown men crying. We then bit the bullet and ordered two of the NEC FETs from its US distrib- utor, California Eastern Labs(CEL).
With cold, dry weather, we were in a real dilemma. How do you protect a hun- dred bucks worth of minute transistors from static elec- tricity while you are solder- ing them into the circuit? We finally decided that we needed a work area with a good ground and high hu- midity. Richard's front bathroom was selected to be converted to a reduced static work area. We turned on the hot water in the shower to steam things up.
A piece of copper braid wrapped around my wrist and grounded to the cold water pipes provided the ground needed, A large piece of copper^covered PC board also was grounded to the cold water pipe and was used as the work surface. We let the soldering pencil
heat up and then un- plugged it from the ac line and grounded it with a jumper to the work surface for more static protection, f quickly soldered the first transistor in before the iron could cool. After I stopped shaking, we reheated the soldering pen and 1 soldered in the second tran- sistor. It's amazing what lengths you will go to when a hundred dollars worth of FETs are at stake.
The LNA was mounted in a box made of double-sided PC board, with feedthrough capacitors supplying the correct operating voltages from a very simple resistive divider power supply. Next we gave the LNA a try. It wailed like a banshee! In other words, it acted more like an oscillator than an amplifier.
How did we tell that it was oscillating without us- ing test gear? We discov- ered that any oscillation within the 3J-to-4.2-CHz band is immediately ob- vious on a TV connected to the receiver. If the oscilla- tion is strong, there will be very prominent black bars on the screen regardless of where the local oscillator is tuned- If the oscillation is weak, there will be a very weak but still visible black bar. Black bars will occur twice, 70 MHz apart, within the tuning range of the local oscillator, if you are using a single conversion receiver (since you get both the signal and its image).
If the oscillation is out- side the tuning range of the TV, however, it will not show up on the TV screen. If you can't see it on the TV and if you don't have a spectrum analyzer to test with, how do you know that it is still oscillating? Noise, noise, and more noise at the 70-MHz i-f stage.
What to do with the oscil- lating LNA? Start over! We wrote California Eastern Labs for their Application Note AN80903 that de-
scribes an LNA using the NE21889S. A prompt re- sponse from CEL brought it to us. In the CEL design, the LNA was mounted in a ma- chined-brass enclosure. We could not immediately lo- cate any half-inch-thick brass to make the enclos- ure, but Richard, scroung- ing through his junk pile, located a short piece of copper bus bar which was suitable, A little persuasion was applied to a local machine shop and presto, we had two nice machined- copper enclosures.
Since we thought it would be impossible to re- move the GaAsFETs from the first LNA board without destroying them, we or- dered two more NE21889s from CEL. At $103.25 for the pair, this project was getting expensive!
Richard arranged for a local print shop to make negatives for the printed circuit board to within .002 inch of the dimensions specified in the CEL Ap Note. We quickly made a board and waited for the second pair of transistors to arrive.
While waiting for the transistors, we did some se- rious thinking about a pow- er supply for the LNA. As previously mentioned, we had already zapped two ''cheap'' FETs. We wanted a reliable LNA power-supply design that would protect the expensive little buggers. Many hours of design, building, and testing of cir- cuits by Richard resulted in the LNA power supply board described here. We call it our "How Not to Gas Your FETs Bias Supply Board/' It was designed specifically for a two-stage LNA using the NEC 21889 FETs.
Some criteria for the de- sign: It should —
• Supply +3 volts for the drain and —3 volts for the gates.
• Power two stages of CaAsFETs.
Fig. 2(al PC-board layout
+ v
Fig. 2(b}, Parts placement
• Require only one pair of wires for the LNA so the supply voltage, with proper blocking, could be carried on coax cable.
• Provide reverse polarity and overvoltage protection for all gates and drains.
• Regulate gate bias and drain voltage with a main- supply voltage falling any- where between +15 and + 30 volts.
• Have most parts avail- able from Radio Shack.
The circuit described in Fig. 1 meets all of the de- sign criteria. The input volt- age, which can be from + 15 to +30 volts, is ap- plied to an LM317T adjust- able voltage regulator, which reduces it to +3,7 volts. The + 3 J volts is then filtered by a 1-uF tantalum capacitor and fed through 33-Ohm current-limiting re-
01
2f bHar^^AAMlMS^^Ad**J f I
^
CAPACITORS
C4
-4h
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02
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^
^
k
C3
BK
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CG
'^h?.
|^]ch3 []'Ch4
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62 D^
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Fig. 3. Typical GaAsFET amplifier schematic.
I Ip^t
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fig. 4. Typical LNA board layout (not to scale).
73 Magazine • February, T9S2 93
HEjff.ll^NK
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fig. 5, Receiver power supply schematic.
sistors to the drains of the two CaAsFETs. The test points on each side of the 33-Ohm resistors are used to measure the voltage drop across the resistors and, therefore, the current being pulled by each FET. A voltage drop across the re-
sistor of 33 volts equals 10 milliamperes of current be- ing pulled by the FET. A 3.9-volt zener diode limits the maximum drain volt- age, and high-frequency filtering is provided by the ,01-yF capacitors. The voltage is then fed through
IN 91 4 diodes for reverse voltage protection. This completes the drain supply. We decided to generate the required negative volt- age from the positive sup- ply instead of going with a bipolar supply. Past experi- ence has proved that for us, the negative-voltage regu- lator always fails first. With no negative bias, high-drain current would probably result, zapping the expen- sive FET. For the gate sup- ply, the +15 to +30 volts is applied to a 78L12 regu- lator. The regulated +12 volts is used to supply a
Fig. 6fa| Receiver power-supp/y PC board layout
TANT
Fig. 6(bl Parts placement
NE555 timer iC configured as a free-running multivi- brator. The output of the 555 fs rectified with a volt- age doubler and filtered to give a negative voltage for the gate bias. The negative voltage is applied to two lOkOhm ten*turn pots. The zener overvoltage, diode reverse-polarity protection, and high-frequency filtering are the same as for the drain supply. A PC-board layout and parts overlay for the LNA power supply are shown in Fig. 2.
Everything was now ready for the arrival of the second pair of FETs. When they arrived, Richard soldered them in using a Radio Shack battery- powered, isolated-tip soldering pen that we had purchased for working with the CaAsFETs. By having Richard solder these in, we discovered that the guy who supplies the money for the FETs shakes the most when soldering.
After assembly of the bias supply board, but be- fore connecting it to the LNA, apply +15 to +30 volts. With a voltmeter, ad- just pot R1 for + 37 volts at the test point IPC (Test Point Common). This will result in approximately +3 volts to the drains after the .7-volt drop across the re- verse-polarity protection di- odes. Set the 10k bias pots for —3 volts at points G1 and G2,
The supply is now ready for connection to the LNA, using the isolated-tip, bat- tery-powered soldering iron, with the tip grounded to the LNA board Refer to the "typical" LNA schemat- ic. Fig. 3. Be very careful to connect the gate leads, CI and C2, before connecting the drain leads, D1 and D2. With a voltmeter across the 33-Ohm resistor, + probe to TPC, — probe to TP1, ad- just G1 bias for a 33-volt reading. This indicates that 10 milliamperes of current is being pulled by the
S4 73 Magazine • February, 1982
CaAsFET. Move the — probe to RP2 and adjust the G2 bias pot for a 33-volt reading, Now go back and check FET #1 . As you adjust the bias pots, the current should evenly increasel If the current jumps or is erratic, the LNA is probably oscillating. How to stop os- cillation is the subject of another article!
Using the above-de- scribed LNA power supply and tune-up procedure, the CEL LNA design came up beautifully, with no oscilla- tion. Its two stages gave a solid, measured 21 DB of gain. We were unable to measure the noise figure di- rectly, but the fellow with the test equipment said that it appeared to be very low, based on his evaluation of the ratio of gain to noise generated by the test equipment
What type of picture do you get with a two-stage, 21 -dB gain LNA that has an unknown noise figure? Very poorf After getting the first CEL LNA working, Richard was able to remove the NE21889S successfully from the commercial board, We built up a sec- ond board, using the cell design and our LNA power- supply board. Again, the CEL design came up with absolutely no problems. Now, by cascading the two boards, we were getting some results.
After optimizing the boards, which I will cover r>ext we have numerous transponders on SATCOM I above noise. We are locat- ed in the 32-33-dB footprint and the antenna is a home- :>rew 12-foot spherical. We lave made comparisons of >ur four-stage CEL LNA and i 120-degree commercial -NA. Our home-brew LNA lompares very favorably vith the commercial unit.
rrimming an LNA for Best sloise Figure and Best Cain
After having gone hrough the misery of trying
'See Ltst of Advertts&rs on page 714
to build an LNA with almost no information and abso- lutely no test equipment, we now can describe some of the procedures we had to discover the hard way.
The first step is to pre- pare a work area so that you minimize the possibili- ty of blowing those costly CaAsFETs. A piece of print- ed circuit board makes an ideal work surface. Again, you will need a good isolat- ed-tip soldering pen. Ground the tip of the pen to the work surface with a jumper. The battery- powered pen sold by Radio Shack works great. You should ground yourself to the work surface with a piece of copper braid. You also will need an X-acto® knife, a BB or small ball bearing, a plastic tuning wand, and a steady hand. Clue the BB or small ball bearing to the end of the plastic tuning wand.
The LNA, as built should produce watchable video in most areas of the country. With power on and a tran- sponder tuned in, make sure that the correct cur- rent is set for each stage of the LNA (10 mA per stage for the NE21889). You should monitor the current of each stage as it is trimmed. Place the BB on the PC-board trace edge as per Fig. 4. Slowly move the BB around the outside pe- rimeter of the striplines, keeping it in contact with the stripline. Monitor the quality of the received pic- ture as you move the BB. When a point is found where the picture quality gets better, you need to add copper to the stripline. If the picture quality gets worse, you need to remove some of the stripline by making very light cuts. We only score the copper with the X-acto knife so that it can be soldered back to- gether if needed. Make sev- eral trips around the strip- lines and note the effect
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before doing any adding or trimming, Make a log of the points where changes occur and see if they repeat each time you run the BB by them. After you are con- vinced of the points that need changing, then make the necessary adjustments. Copper can be added by salvaging a piece of foil from another piece of PC board or by using GC Elec- tronics Silver Print paint.
After the adjustments are made, make a slight in- crease in the current for each FET stage while watch- ing the picture quality. We
have run the current up to 40 milliamperes on a stage with no oscillation. The first stage will probably have to operate at 8 to 1 2 milliamp- eres for best noise figure. Successive stages can oper- ate at higher current levels for more gain.
The basic power-supply design (Fig, 5] and PC board layout (Fig 6) power the bias board and also our com- plete satellite TV receiver. There is nothing special about it except, again, that an effort was made to use parts available from Radio Shack. ■
Printed circuit boards are available from IVIartcomni, Inc., PO Box 74, Mobile AL 36601, for the power supplies and the LNA. The LNA board is $20.00, the LNA bias supply board is $t2.00, and the receiver power-supply board Is $10.00. Add $1J5 per order for first class postage.
You may request the CEL LNA Application Note ANa0903 by writing to Caiifomia Eastern Labs at 3005 Democracy Way, Santa Clara CA 95050. A copy of the Note is supplied with each LNA board ordered from Martcomm, Inc.
J
73Magazine * February, 1982 95
BifiyL Nlehen W&4APC Rte 2, Box ISll Raddiff KY 40160
Microwave Master
you might not need a mountaintop
With the growing inter- est in satellite televi- sion reception, weather pic- ture reception, and higher frequency utilization, the need for a better under- standing of microwave prin- ciples becomes more im- portant than before.
To better understand mi- crowave techniques, we must first understand the frequency bands and the characteristics of the mi- crowave spectrum in rela- tionship to other lower fre- quency radio waves. As we know, radio waves travel mostly along the ground path and are not readily af- fected by mild changes in the weather or atmosphere. When we get into the mi- crowave region, the charac- teristics are entirely differ- ent
To begin, let us take a look at what microwaves are. Radio wayes above the lOOfrMHz level are called microwaves. It is a common practice to relate to this portion of the frequency spectrum in terms of Giga- hertz (GHz), With a frequen- cy of 1000 MHz being equal to one Gigahertz. The basic spectrum of microwave fre- quencies is made up of
three very basic bands. These bands are: the S-band centered at about 3000 MHz (10 cm), the X band at about 10.000 MHz {3cm), and the K-band at about 27,000 MHz ni cm).
Table 1 shows the rela- tionship between the bands by wavelength in both cen- timeters and inches, and Table 2 shows some of the services operating there. You will notice from the table that a full wavelength at the microwave frequen- cies is not very long. When we get into working with the construction of micro- wave equipment and subas- semblies, these measure- ments will have a very significant meaning.
The first cavity magne- tron was developed in Great Britain in 1940, after the publication in 1936 of two papers on hollow wave- guides. These papers are: "Hyper-frequency Wave- guides—General Consider- ations and Experimental Results" by G. C. South- worth, and "Transmission of Electromagnetic Waves in Hollow Tubes of Metal" by W. L. Barrow. During the period of early develop-
ment around 1940, most of the experimental work was carried on in the Radiation Laboratory at the Massa- chusetts Institute of Tech- noIogy> During this time, almost all experimental work in microwaves was di- rected towards the design and use of microwave radar equipment, due to the small size of antenna equip- ment required in the micro- wave region.
After the second world war, more efforts were made in other areas to the extent that today, almost all long-range telephone communications are re- layed by microwave links As scientific advances be- gan in outer space, the role of microwaves became even more important. In fact microwave technolo- gy has made possible many of the products used today in our homes, business, and in private industry. An ex- ample of a modern use of microwave technology is the microwave oven found in many homes and busi- nesses.
Microwaves are also used in many of the security alarm systems found to business use and have been
used by private industry for some time for cleaning of parts, removal of broken screws and bolts, and for controlling signal devices at railroad crossings and drawbridges Another use with which almost every- one IS familiar is the radar speed control devices used by police forces all over the country.
To understand micro- wave principles, we must first take a look at some of the characteristics of mi- crowaves in relation to other forms of radiation. We must also learn what variables affect the micro- wave signal itself
To begin, microwaves normally travel in one or all of four basic paths. These four paths are direct wave, reflected wave, surface wave, and sky wave. In most microwave installa- tions, the direct wave is the desired path, although the reflected wave also may be of importance in some in- stances.
The direct wave is so named because of its direct path from one point to an- other. With optimum condi* tions, the most reliable communications can be ob-
96 73Magaiffte • February, 1382
|
Band |
Frequency (MHi) |
Wavelength cm Inches |
|
S-band X-band K-band |
3,000 10,000 27,000 |
10 4 3 1.2 1.1 .44 |
Service
Fi«quency
Amateur
WEFAX
MDSTV
Table 1. Microwave bands.
tained through the use of the direct wave.
The sky wave normallY is considered to be a wave that has been reflected from the ionosphere, a re- gion that extends from an altitude of approximately 30 miles on out to about 250 miles. In the area of sat- ellite television or weather fax, a signal which is trans- mitted from a satellite is not considered to be sky wave but instead, falls un- der the classification of a direct wave that has been retransmitted.
Surface waves are waves that travel along the sur- face of ground or water. They are mostly predomi- nant at the lower frequen- cies. At microwave frequen- cies this mode of propaga- tion is usually insignificant and in most cases may be disregarded.
The reflected wave is a wave that has been reflect- ed from the land or water surface of the area between the transmitter and receiver antenna sites. A factor that determines the strength of the reflected wave is the type of surface that the wave is reflected from. Land is considered to be a poor reflector and will scat- ter the wave in many direc- tions. Water is a good re- flective surface and gener- ally will reflect the entire wave in one direction. The reflected wave is only im- portant when the reflected signal is picked up at the re- ceiving antenna with a strength comparable to the strength of the direct-wave signal. At this particular oc- currence, the reflected wave may either boost the direct-wave signal or cancel it almost completely. The determining factor at this
t^See Ust of Advertisers on page 7^4
time is whether the two sig- nals are in phase with each other. If the two signals are in phase, or nearly in phase, or if the two signals are of nearly equal strength, the combined signal can be twice as strong.
However, if the two sig- nals are nearly 180^ out of phase with each other, there will be a reduction in signal strength since the re- flected signal will cancel some of the strength of the direct-wave signal.
A phase difference be- tween the direct wave and the reflected wave is usual- ly introduced by the dif- ference in the distance each wave travels. This dif- ference may vary from in- stallation to installation and can be anything from a fraction of a wavelength to many wavelengths. When the path difference is an odd number of wave- lengths, the two signals {direct and reflected) will arrive at the receiving antenna in-phase. This is especially true when the wave is reflected at small angles of incidence, which cause a phase reversal of 1 80®. In the case of horizon- tal polarization, the phase reversal is nearly 180*' re- gardless of the magnitude of the grazing angle^ This is also true for almost all in- stances of vertical polariza- tion in most point-to-point communications systems.
An interesting fact about microwave energy is that the signal tends to be slight- ly curved. This is because the signals travel through the atmosphere at speeds that depend on tempera- ture, atmospheric pressure, and the amount of water vapor present in the atmosphere.
1296 MHz 1691 MHz 1900-2600 MHz
Satel I ltd TV 37004200 M Hz
Table 2. Some services operating in the micfowave
frequencies.
Wivelength cm Inchei
23 ai
17,8 7
15.8-12 6.2-4.7
fr7 3,2-2.8
The following three con- ditions will have an effect on the microwave signal; The higher the temperature, the faster the signal; the lower the atmospheric pres- sure, the faster the signal; and the lower the water vapor content, the faster the signal.
With these influences, the net result is that the signal speed changes with altitude. Under normal con- ditions, the variation is a small and uniform increase in speed of the signal with an increase in altitude. In this manner, it readily can be seen that in a way, the microwave signal acts very much like a light beam. Just as a light beam can be re- fleeted or bent, so can a mi- crowave signal be reflected or bent.
Using the above informa- tion, we also can see that microwaves can be very re- liable for communications systems. The most impor- tant factor is to ensure as direct a line-of-sight path from the transmitter anten- na to the receive antenna as possible. With prior study of the potential path, it is really not too difficult to plan a microwave system. The thing to keep in mind is that the complete path of the microwave signal must be free of any obstructions such as trees, hills, or tall buildings. When transmit^ ting over water, the reflect- ed wave may play an impor- tant role in the received sig- nal. When you are design- ing over-water point-to- point systems, it is very im- portant to ensure that this reflected signal does not ar- rive at the receive antenna in an out-of-phase or nearly out-of-phase state.
A simple rule-of-thumb method can be used to de- termine possible antenna heights, especially for over water paths. The antenna heights chosen must satisfy the following relation: /2lTi + /2lT,= S, where H, and Hi represent the an- tenna heights in feet above sea level and S represents the distance in miles be- tween the antennas.
The next step is to calcu- late a correction height using the formula H = n/S/F, where H is in feet, S is the distance between the antennas in miles, and F is the operating frequency in MHz. The required antenna height for each antenna is the sum of the tentative height and the correction height for each antenna, or, more simply stated, H, + H and Hi + H. If the values obtained are not conve- nient, then select new ten- tative antenna heights and perform a new calculation.
For example, if we as- sume a transmitting anten- na height of 1 400 feet and a receiving antenna height of 2000 feet at a distance of 100 miles, the computation would be: V 2(1400} + V 2(2000) = 100 (miles). The square root of the H^ com- ponent is 52.92; the H^ square root component is 63.25. This gives us a total of 116,17 miles. It is then quite evident that one or both of the contemplated antennas are too high. By using the S value of 100 and working backwards with the formula, using Ht as the base antenna and recom- puting for Ha height: 100 — 52.92 = 47.08 squared = 2216.53 divided by 2 = 1108.26 feet. Therefore, the
73 Magazine • February, 1982 97
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new height that meets the relation is 1108 feet for H^. By the same token, we could have kept antenna H j at the height desired and re- computed the height f or H i .
Using the corrected fig- ures for antenna heights of 1400 feet for H^ and 1108 feet for H^, v^e now can compute the correction heights for both antennas at a frequency of 1296 MHz: H = 660V 100/1296 = 183J3333 feet. This gives us a final figure of antenna height for H| of 1400 + 183.33 or a total of1583J3 feet and for Hi 1108 + 183,33 ora total of 1291.33 feet. Given the figures above, we can now look for possible sites to install antennas.
Of course, we may not al- ways find the ideal spots for our antenna construction. In this case, we go back and recalculate using different antenna heights (plus eleva- tion above sea level) to ob-
tain 3 relative figure equal to the desired distance fig- ure. Sometimes just one or two feet may make the dif- ference at the receive end. In any attempt at micro- wave, if at first you do not succeed, try again at anoth- er location or change the height of one or both of the antennas. In selecting a good antenna site, a very good aid to locate the ideal sites is a topographical map of the area locality of choice. A source of infor- mation for obtaining topo- graphical maps is at your state capital. Try writing a letter either to the State De- partment of Natural Re- sources or the State Forest* ry Division. There is a fee re- quired for copies of these maps, but it is usually very small when one considers the information that can be obtained and the time that can be saved. Happy ham- ming on the microwave bands.
Hm HELP
I am in need of the schematic and alignment information for a Gonset G'77 transmitter and in- formation on a TU-8-B plug-in unK used with 8C1 91/375 trans-
mitters, I will copy and return your originals,
Howard Palmer WfflRT
1125 Basswood Land
St Louis MO 63132
I am looking for employment in the electronics field, in the Knoxville-Chaltanooga, Tennes- see area. My background in- cludes 25 years of experience with rt circuits, and 1st phone license with radar endorsement, and an Extra amateur license.
Herman F. Schnur
115 Intercept Ave.
N, Charleston SC 29405
I am giving away, free, in ex- change for postage, a R336/GRC26 army receiver and 6K7, 6J5, 6R7, and 6C6 tubes,
I am looking for ar> Ameco R5 receiver and schematic for same. Please state condition and price,
Kevin Keal
Route A, Box 211 A
FJIppln AR 72634
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9S 73 Magazine • February, 1982
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Ki- RErilCTOPi. r-ACi: -DF rerii JWWfihATIJl F[HE«S5LWi. a* I rtftfllJ^WE TBEAtED FOB CftflKK-JM KSl St JWCI . FLLilPl>l;rHT fC* Hasr rft£.&llENC]eS ftMA]LffiL£ DM HfOilESr. S«IPP]Nt IT IJl^i OS HCffm itlEiOIT flLLOW 6 «tEKS FOR ULlVEiiT CALi FDH <lORf IHFO (?&S] ??^',«i6|t ^ W tO. Spin tnoiptlir tlM.
PRICES SL-&JtCT TO dtWttt M TO HATEP-tW. 1CST5
1^327
NORDLUND & ASSOCIATES
;!JU i*NP] PlKEi KUiHA JiJfti>;. n36M
JOrt r. HDMLUIID ^UlKt^
+ ♦■-■#—
s : I ■ ■ I
? I 1 r ■ .Is" ■ : I i
Introducing the Model 7600 Satet
eiver: New
3|ilbspie bM2
iBtistic^arid ease of op^rfifionfCaM^ Ajtl^^'^'^^'S'
4-
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1
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- f'
f4^^tM^Hls
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4-
1-L-
JmpfdvJB^ videcj) senisitiUt^
;"j»i Ait wood walnut cabinet^,
hihe Model 7600SatelIhG Receiver System Paid^Spteisfii^W^^
cable a
i J = ; t
"^ ^^1 — I — I — I — \ — I — I — '
inbu^ted Image Rieject Mixer {DqwniGonveiit<>]l);;lQ^'5Q^ ; iQO' of Bdden DC cable with corinfBctbrs! mst^lled' ■ *"
GEt^ THE LAST WORDTlRStl'' LtHtii XQIUR qilM§P||£^ A^pPPPATEiS DEALER^!
I i } \\-\ Khi Hj- i -j-tj- i ill i M 1 1
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The Luly ANTENNA and POLARIZER
Completely portable Antenna, comes fully assembled (folds like an tjnbrella and is not a kit).
The Polarizer is an electronic rotator, which can change polarities with a flick of a switch [no moving parts). Eliminates weight,
twisting cables, freeze ups, and down time.
LULY TELeCOMMUNICATIONS CORP.
P.O. Box 2311, San Bernardino, California 92406
(714)888-7525
Dealer and Distributor Inguirtes Welcome
See Usi of Advertisers on fiage 114
73 Magazine * February, 1982 99
SATELLITE TV SYSTEMS
"COM PARK OlIR QUAl IT\\ PRICf:S AND StRVlCEr'
WKMAMiFACTtRt:
PARABOLK DISHES POL AK MOUNTS DEMO TRAILERS
WASHBURN
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MOTORIZATION SYSTEMS LNA HOLDERS ALUMINUM HORNS
ALLIANCE
ATV
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SWITCHES &. HARDWARE
CALL, WttrrLOK ^ frOR OJIR LATKS^T PROtHlitL AND FRICfrJ^.
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901 7S4'2I?1 HUMBOLDT, IN. ?S345
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AVAILABLE NOW
PCS-300
TWO-METER HANDHELD
KDK
atso: 2025A MR II (W/TT micj
$290.00
PCS-300 HT $290.00 PCS-3000 XCVR 290.00 eemot* cable 37-00
Phase n ant. 28.50
Other ace. Call
Frea ahlf)pin§ in U.S.A. tof all XCVR or HT ordars
B. Q. CARL ELECTRONICS
11128 Claire Ave. Northndo«i Calif. 91326 Call: C213} 363-1216 - anytime
s^4€9
ALL NEW 1 5 Meter Mobile CW & USB
21.000— 2 1.450 MHz
High (OW (PEP) low 2W (PIP): VFO tuning; noise blanker; fine- tune SB^ KHz ± CW of f-5et; digital frequency counter; J 3.8V dc @ 3A, nege^cive ground: L9.5" x W9" x H Z.5"; weight (2.3 kg) 5.7 lbs.; mobile mounting bracket.
SERIOUS DEALER LISTS AVAILABLE
tvLt::.aL CO-
NCG
^3li
1275 N. GROVE ST. ANAHErM, CALIF. 92806 (714) 630-4541 NOTE: Price, specifications subject to change wtthout notice tfind obligation,
WORK THE U.H.F. BANDS
Add a trans verier or converter to your existing 10m, 6m or 2m equipments. ChtKJSe from the largest selection of modules available for DX. OSCAR, EME, ATV. TRANSVERTERS MMT 50-144 $234.95
MMT 144^28 $219.95 MMT 432-28 (S) $319.95 MMT 439-ATV $379.95 MMT 1296^144 S399,95 ^^^^ OTHER MODELS AVAILABLE
CONVERTERS
Choose from many models to suit your needs. Examples: MMC 432-28, MMC 426/439— ATV
MMK 1296-144, MMC 12S0— ATV Write for details and available options,
FILTERS
Prevent OSCAR 8 Mode J desense Use MMF200-7 $42.95 Stop receiver IMD birdies U-.' PSF432 $59.95
ANTENNAS
420^50 MHz J -beams
48 eL 15.7 dBd $75.75
88 eL 18.5 dBd S105.50
1250^1300 MHz loop yagi 1296-LY S49.75
Send 36C stamps for full details of all our VHF/UHF items
Pre-seleaor filters Transverters
Low-pass filters Converters ^VSA ^
Varactor triplers ^ Antennas
Pre-ampiifiers W ^Trystal Filters
Spectrum iTtteriiatlaiial, Inc. Post Office Boi 1084S Concard, Mass, 01742 USA
70/MBM 48
masi^t crvarge
t^436
i
FAST SCAN
M
A modular approach. . Jor your own custom-designed ATV
system Here's how TXAS^4ATV£XCITER^M0DULAT0R.te»ppd
Tfiim wIrwJ and lasted madufe la deaiorad to drivi- th* Motorola MHW-ZIO module in me PA5 113 wall llnsar iff\\t. Tn* crvalal m (Ke 100 mHz reflion k&eps har- mor^iCi C^ijI 4! luvQ melftra fqi talk bkcih. The v^d«Q (TMsdiila^oF is lull fl mHjt lor compuJ&r gyaptiica and col- or. Requires l3.-&¥-dic r^ ^ 70 ma. Tuned wllh ittal on 439. M. 4S4.0, or 42e.2^ rnHj, Provision fgr ayrtc ftn-
pandirtg Freq. a^^aiiabie.
PAS 10 WATT ATV POWER MODULE %S9 ppd
Th9 PAS will pul OUT 10 wans f^MS pQw^r an tne sync t^ps wh*n df<v#n with BO mw fty line TXA5 e.<cller. SO ohms in and oul, ptus bandw>icF(h lor the wtioie band wkth good lln«ar'it¥ fot CQ^of and sound. Requir<&s \3,3 vd€ rflgulaled @' 3 amps.
FMA5 AUDIO SU&CARfllER GENERATOR
w -r ■ !■-■■■ ■ ■■■■■■4 ■ m * t m ^)9^ if-ll pihfeAHiBBia-HBB ^&9 UQU
Puis audio on wiih /our camera video (usi as iac^^}- caei TV iJo^sai <.& mHz, Pci&out tip to 1 w p^p 10 dnve ih* TXAS at VM'2. 3, or 4 rrodulalors. nequii>e$ l^w Z itiht (ISO 10 6W otiimsj. and + 12 Id IB vdc ® 25 ma. Works with any xmlr wtlh b mHz vid^^ baniJwicl^lh,
TVC-2 ATV DOWNCONVERTER. . . . «S5 ppd
&tri]>iirte MRFftOl j1.7 db H^} pr*6m:p and (foubie bai' anted mtjcer module digs ouE Iheweil^ criesbur t«si£.iis mlBirmocJs and o-verJoad. C<?Tvn&ctsbel*sen uhf anlen- na and TV aet 1un«d lo ch^nnei 2 pr 3 vnficap' tun^s- 4^0 to 450 mHz. Requires + 12 to TS vdc ® 20 ma. Super ssnailive TVC'2L *i(h NE64535 o^eamp^.9d±) NF} Stage . . SE9 pp<l
*TXAS, PA&, FMA5 and TVC Baslo Module Pkg-
Call tif wrtle tor our complete Det qf specificatjons, statiion set-up dlagrams^, and
optional accessories v^tiich include antennas, modulators, detectors, test
generators, cameras, etc. WE ARE A FULL-LINE SUPPLIER OF ALL TOUR ATV
NEEDS.
TERMS: VISA or MASTER CARD by tefephone or mail, or check or money order by
mail. Afl prices are delivered in USA. Allow three weeks after order tor delivery.
(213) 44? 4665 Charge card orders only
P.C, ELECTRONICS 2522 Paxson lan©, Tom weORG Maryann WB6YSS Arcadia, California 91006
100 73 Magazine • February, 1982
Two Keys TO Perfect code. . .
^^ssmmua^m^
Save over $14.00 with complete CW package for H-8/H-89-
Package includes CODEM, Interconnect Cable, Power Supply, CW39 Software, compfete documentation and shipping.
CWa9P $249.95
COMMDSOFT
^59
665 Maybell Avenue • Palo Alto, CA 94306 • (415) 493-2184
Write for free catatog
Ca I Ef 0 rn la res tdB n t a ad d ap p I i dab le sal e ^ tax . Master Card and V ISA ace epted
The CODEM: a universal CW interface for your personal computer
*1 24.95
Here is an easy way to get your Morse code software on
the air I The CODEM converts received CW audio to RS232 or TTL signal levels and RS232 or TTL signal levels to transmitter keymg. The CODEM doubles as a code practice oscillator and CW regenerator A sharp 800 Hz bandpass filter, AM detector and low pass filter are designed into the CODEM to provide outstanding noise and QRM rejection. Requires a 9 VDC power supply.
vUUtrVI .>.« .riiTciiii #1^4.93
9 VDC PowerSupply 9,95
Shipping and IHandting , 5,00
CW89: a sophisticated split screen Morse code transceiver and trainer program for Heath computers.
$
99.95
Transmit and decode CW with your H-S/H-IS, HB9 or 2-89. This feature packed program incorporates 4-99 WPM operation, receive autotrack, a 1000 character pre^ type buffer, 10 user-definable messages, unique break- in mode, on-screen status, disk I/O and hard copy and a versatile code practice section. A comprehensive manual and prompt card are included with CW89. Requires HDOS, 32K RAM and hardware interface (such as the CODEM).
CW89posfpa/d $99,95
CW89C H.8/H-89 Interconnect Cabie for CODEM 24.95
PLESSEY- AVANTEK- PLESSEY
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SL1610 RF Amplifier SL1611 RF AmpHfter SL1612 AF Amplifier SL1G13 Limiting Amp SL1621 AGC Gen 5L1622 AF AmpVOG
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4-07 SLE690 L.P. IF 5, 93 (|,07 &L6700 L.P.AM \f5.m
5.45 speeto 200 mmo 5.22
6.78 SPB66S 1. 0 GlIO 54.24
FM Rcvr W/Amp 4.41 FM 'ti^vr W/O A 3.39
SP8680 600 MtIO 17.^0
AVANTEK GPD SERIES AMPLIFIERS (GPD 401 ,402,403) $25.00 EA.
^2 - U dB Gain 5-500 MH Z - CIRCUIT BOARDS FOR GPD 400 SERIES AMPS $200 ea.
AMATEUR MICROWAVE DOWNCONVERTER
COMPLETE - ASSEMBLED - READY TO INSTALL - NOT A KIT
50+ dB SYSTEI^ CAIN TUNES 2.1 Ghz* to 2.H Gh;. PREAMPLIFIER 7^ dB GAIN @2.5 dB HF OUTPUT TUNES TV CHANNELS 2 TO 6 OUTPUT IMPEDANCE 75 OR 300 OHMS FULL YEAR WARRANTY PERFORMANCE GUARANTEED OR VOUR MONEY REFUNDED
SPECIAL $179.95
INCLUDING SHIPPING (U,P.SJ
VISA AND MASTERCARD ACCEPTED WE STOCK WHAT WE ADVERTISE
I
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CALL (804) 489-2156 ELECTRONIC HOBBY INNOVATIONS
(^447
7510 GRANBV STREET SUITE 207 NORFOLK , VIRGINIA 23505
^Sse List of Advertisers on page 114
73 Magazine • February, 1982 101
.If s becoming very clear now. . . Yoyr microcomputing life is going to be very
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73Magazme • February, 1982 103
ieny Dijak W9/D 215 Tareyton Dfive IthacA NY 74B50
CW Interface
let your computer do the copying
It is one thing to obtain software to decode Morse code with your com- puter, but it is quite another to process the audio signal delivered by your receiver in such a way that the com- puter can use it. This article will describe one approach to solving this hardware problem and also describe the construction and opera- tion of an interface circuit using these principles.
I will assume that you al- ready have software for de- coding Morse and will de- scribe the needed hard- ware. An example of such a program was presented by Thomas' in the December, 1977, issue of 73. For our purpose, we will assume that your software requires a TTL signal that is logic low during the key-down in- tervals and logic high dur- ing the key-up intervals.
Proper operation of your decoding algorithm will re- quire the presence of one logic level during the key- down interval and the op- posite logic level for the key-up state The computer must see only one or the other of these states at any
M
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♦-PCILE
BANDPASS
FILTEII
one time, and they must change only when the state of the desired signal changes. State changes should not be affected by interfering signals or ran- dom noise.
An extremefy simple cir- cuit could successfully be used to interface a com- puter to a ham receiver if the audio signal produced by the receiver were perfect (absolutely noise-free and of constant level and fre- quency), but the circuit must be considerably more elaborate if the computer is to perform property with the imperfect signals typi- cal of ham-band operation.
Typical receiver output during CW reception on to- day's ham bands presents a difficult problem when at- tempting to decode the sig- nal with a computer. Even if the operator is using a se- lective receiver (400-Hz bandwidth) designed for CW reception, several dif- ferent signals usually will be present in the audio- The signal that the operator is trying to copy probably will be tuned for his preferred
pitch, while the others will be present at other frequen- cies- The desired signals probably wilt be the strong- est, but the others may be fairly strong also.
In addition to these inter- fering Morse signals, there will be noise. In the signal output that is available to the computer interface cir- cuit we will have, in gener- al, voltage due to our one desired signal and also con- siderable voltage due to all the other signals and noise being processed by the re- ceiver. In order to decode the desired signal success- fully, we must have a way to detect the voltage due to our desired signal while ig- noring as best we can the other signals and noise.
Desirable Interface Qualities
We can summarize sev- eral design objectives for our receiver-computer in- terface. First of all, it should be (as always) small, inex- pensive, and easy to con- struct and operate. Second, it should respond only to one very narrow band of au- dio frequencies, for maxi-
OtTECTOB
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I
SUCER
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^•e TTL UUfPWT
THBESHOLO SELECT
Fig. 7, interface block diagram, 104 73 Magazine • February, 1982
mum immunity to adjacent signal interference and noise. Third, the output should be bistable and TTL- compatible for proper inter- pretation at the computer input port; the output should be either logic high ( + 3,5 to + 5 volts) or low (0 to +0.6 volts) and never in between. Fourth, the deci- sion threshold of the detec- tor should be adjustable to allow the interface to oper- ate properly with both high- and low-level audio so that the operator is not forced to operate a certain audio gain setting which may not always be convenient. And fifth, the interface should work while the speaker of the receiver is operating, so that the operator can hear the code while it is being decoded to allow detection of computer errors (decod- ing errors can be expected under adverse reception conditions).
Theory
Fig. 1 is a block diagram of one approach to doing the required processing of the receiver audio. The first stage is a limiter which pro* duces a known signal level at the beginning of the cir- cuit; this allows the rest of the device to be designed optimally for this level. The limiter is followed by a 4-pole active bandpass
AUDIO ^OK
IfiPUT ° ^
CAPACITOR VALUES fN ^F
o TTL OUTPLiT
F/g. 2. Interface schematic.
THRESHOLD
SELECT
(TTLt
filter. The filter is tuned to 950 Hz and has a design bandwidth of 80 Hz. This fil- ter works by amplifying the signal about 16 times at its center frequency and atten- uating signals not within its passband. This ensures that the detector stage only sees voltage due to the desired signal. The detector itself is merely a half-wave rectifier (a diode), and it is followed by a simple RC tow-pass filter so that the output of the filter follows the pulse shape of the signal as close- fy as possible. The output of this stage will be maximum when the signal is present and minimum when there is no signal present,
The slicer stage decides whether there is a signal present or not. It does this by comparing a preset threshold voltage to the voltage it receives from the detector and filter. When- ever the received signal ex- ceeds the preset threshold, the slicer quickly switches its output state from -10 V to +10 V.
Under ideal conditions, the output voltage at this point in the circuit would never exceed this preset threshold when only noise and interfering signals were present. If the voltage ex- ceeds the threshold only when the desired signal is indeed present, no errors will be generated. If this is not the case (and usually it IS not), errors will be generated whenever the combined level of the inter- ference and noise exceeds
the threshold. (The slicer will change state.) As soon as the voltage subsides, the slicer will revert to the cor- rect state. For optimum op- eration of the overall hardware/software system, your decoding algorithm should be designed to ig- nore these spurious but unavoidable brief state changes due to noise.
Finally, the output buffer converts the signal levels produced by the slicer (which are incompatible with the computer input gates) to correct TTL levels.
The Circuit
Fig- 2 shows the sche- matic of one circuit that meets the design objectives outlined above. I know that not many people build any- thing exactly as it is de- scribed in a magazine arti- cle [neither do I), so I will not only describe this cir- cuit but will also give a lit- tle of the thought behind the design choices that I made.
Diodes D1 and D2 form the limiter, and these should be silicon types to give a limited signal of about ±0.6-V peak at this point. R1 is used to keep the input impedance of this in- terface high so that it may be used across an existing high-impedance output of your receiver {the anti-VOX output on a Drake R-4, for instance), in parallel with whatever you normally connect to that output. So, this circuit can simply be added to your existing lay-
out with little effect. Also, because the signal level is limited to 0.6 V, only about al-volt peak of audio signal is required at the input to this device. On my receiver, the anti-VOX output puts out more than enough volt- age at moderate speaker volume levels. Another ad- vantage of permanently connecting the interface to a high-impedance point in your receiver is that the speaker and headphone outputs can be used or dis- abled without affecting the connection to the interface.
Components R2 through U2 make up the 4-pole ac- tive bandpass filter. My first prototype used only a sin- gle-stage filter (2-po I e), but I found that it was allowing too much interference from adjacent signals. I therefore decided to go to a 4-pole design, with the resultant much steeper skirts to the passband. The filter design itself was arrived at with the help of articles by Stark^ and Stewart^ in past issues of 73, regarding active filter design. Each stage of the filter is designed for a Q of 10. The center frequency of stage 1 is 975 Hz and that of stage 2 is 930 Hz. This yields a 3-d B passband of about 80 Hz and very steep skirts and requires only 2 ICs. (Strictly following the cri- teria used by Stark would have yielded filter stages with higher Qs, but also would have required a total of 4 ICs and several more resistors in the design. My approach sacrifices some
skirt steepness but elim- inates many components. That was my choice,)
Each filter stage is de- signed for a gain of 4.8 so that at the overall filter cen- ter frequency of 950 Hz the complete filter has a gain of about 16. With the 0.6-V peak input, about 10-volts peak output is developed at the detector. If you would like to try your own hand at designing the filters (per- haps you'd like to use ca- pacitors you have in your junk box or a different center frequency), use the procedures given in either of the above two articles but be careful to keep the
first resistor (R2) around look or greater so that the input is not loaded down. R1 and R2 form a voltage divider, and smaller values of R2 will require more drive voltage from your re- ceiver for full limiting.
Diode D3 is the detector, and R8, C5, and R9 form the simple low-pass filter. The filter components were ar- rived at by experiment, the goal being use of a physi- cally small capacitor at C5 and optimum following of the keyed signal pufse shape at speeds up to about 30 wpm. These values meet these criteria well.
U3 is the slicer, and the resistor network RIO, R11, and R12 with Q1 produce a software-controllable vari- able threshold. Using the in- dicated resistor values, when Q1 is not conducting, the threshold at pin 2 of U3 will be about 1.8 volts.
73 Magazine • FebruaryJ982 105
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When Q1 is conducting, the threshold will be lowered to about 1=0 volt. Thus, by ty- ing the input to R13 to one bit of an output port, you can control the slicer threshold through software. This could have been done with a mechanical switch, but I wanted to mount this circuit deep within the bow- els of my computer, con- trolled only by my com- mands via the keyboard. This approach took a while to design, but it requires very little additional space on the circuit board.
Under normal condi- tions, one would use the higher threshold for the best performance. But when you are operating with a signal level that is not strong enough for full limiting and noise condi- tions are favorable, you can extend your operating range by lowering the threshold to about 1 volt.
The output of U3 is either about +10 or —10 volts de- pending upon the detector output to U3. These levels could not be applied safely to the TTL input port of a computer, so the buffer stage, Q2, was added to provide a signal that always remains within the TTL op- erating range of 0-5 V. The
Photo A. Interface prototype.
output of Q2 can be tied directly to one bit of an in- put port.
With this circuit, the idle, or no Signal, state of the output is logic high ( + 5 V). When a signal is present, the output drops to 0 V.
Construction
Photo A shows the proto- type of this circuit in final form. My next step will be to reassemble it on a plug-in vector board for mounting directly inside my comput- er. As you can see, it re- quires a total area of about 2 by AVi inches on the board. None of the compo- nents dissipates an appre- ciable heat, so it is safe to mount them adjacent to each other (but be careful not to short any leads). The wires visible in the upper- right portion of the board are for my temporary power and computer con- nections to the circuit.
All resistors used in the circuit need be no larger than Va Watt. I used what I had in my junk box, so some of the resistors in the photo are Vi Watt. Capacitors CI through C4 should be high- quality polystyrene or mylar^M (and not disc ceramic) as pointed out by Stark. Try to get values for
€l
R2, R4, R7 as close to those listed as possible — al- though the final adjust- ments of R3 and R6 will compensate for any varia- tions from the optimum values. The values for the two trimpots, R3 and R6, need be considered only approximate, and the final adjustment of these two can be expected at about mid-range if the indicated values are used.
Diodes Dl and D2 must be silicon types (small sig- nal) and D3 can be either silicon or germanium, C5 can be disc ceramic. Ql and Q2 are any general pur- pose silicon transistors capable of operating with a 2-mA collector current and a beta of at least 100 (type 2N3566 were used here).
As you can see from the photo, it is not necessary to etch a PC board. All three tCs are type 741. Power sup- ply voltages of +12, —12, and +5 volts are required, but these should be avail- able readily in most com- puters.
Alignment and Check-Out
The only alignment re- quired is that of properly tuning each filter stage. For this, you will need some type of known frequency
audio input. Apply an input to the circuit at 975 Hz, at a level of 1 volt or greater, and adjust R3 for maximum output at pin 6 of U1 . Change the input frequency to 930 Hz and adjust R6 for maximum as measured at pin 6 of U2. You then should find that the 2-stage filter has a center frequen- cy of about 950 Hz and an 80-Hz passband. With an in- put signal level sufficient for full limiting, about 10 volts (peak) signal should be available at the output of U2. Under these same conditions, the voltage at TP-1 should be about 3 volts (dc). As a final check, you can confirm that the output of Q2 is + 5 V with no signal applied and 0 V when a 950-Hz signal is present.
Operation
Once the above initial alignment is completed, no further adjustments need be made. When operating the interface, all one must do is tune the desired CW signal properly so that it falls within the filter pass- band and adjust the re- ceiver's audio level to an optimum value. These two tasks, however, are not quite as easy as they sound.
The easiest way to tune your receiver for optimum operation of the interface requires an oscilloscope. While there is another tech- nique, it has some severe limitations. 1 will first ^oyer tuning with an oscilloscope, and then the alternative if a scope is not available,
Oscilloscope Method
For the moment, let us assume that you have a dual-trace oscilloscope at your disposal for operation
of your receiver-computer combination. Connect one channel to TP-1 in the cir- cuit and the other channel to TP-2, Use dc coupling for both. Use a vertical sen- sitivity of 500 mV per divi- sion for both channels and a sweep speed of 10 ms per
106 73 Magazine • February J982
division. Adjust the base- lines of both traces to exact- ly the same point near the bottom of the graticule. You should then obtain a dispfay similar to that shown in Photo B when a properly tuned signal is being re- ceived.
In the example, both traces have their zero base- lines one division from the bottom of the graticule and the vertical and horizontal settings are as recommend- ed above. The trace visible about one division above the center of the graticule ts the TP-2 threshold voltage [about 1.8 VI The other trace shows the leading edge of a CW pulse that is being received. This display shows just about ideal re- ception conditions and is what you should strive for in your tuning. At the base- line of the signal trace, we can see that there is almost no noticeable noise be- tween CW pulses. This situation is rare but does happen occasionally. (In- deed, the photo was taken during reception of a very Strong off-the-air signal at about 25 wpm J
The first step in tuning is to tune the receiver until the tone of the desired CW signal is centered in the filter passband, as evi- denced by a maximum sig- nal amplitude for the signal pulse on the oscilloscope display. This will take some care, due to the narrowness of the filter pass band. After this condition has been achieved, the next step is to optimize the level of the receiver audio which is be- ing fed to the interface. Making this choice op- timally will require a little experience on your part (which will come with time], but I can give you a few hints.
Your primary maximize the noise ratio at (which is what the TP-1 sig- nal shows). This condition will give you the minimum error rate out of the slicer
goal is to signal'to- the stJcer
stage, and hence within the decoding algorithm in the computer. Since you have a limiter in the first stage of the interface, you will no- tice that you can increase the level of the desired sig- nal only up to a point, be- yond which it will no longer increase.
You will notice also, how- ever, that if you continue to increase the drive level, the amplitude of the noise and interference evident be- tween pulses will increase. This is undesirable. There* fore, you want a condition where the signal gives the greatest difference be- tween the peak of the signal and the peaks of the noise and interference as viewed on the scope. Next decide whether the normal (high) threshold voltage is best or if the lower threshold would be better. Ideally, the threshold of the slicer should be halfway between the signal peak and the noise peaks. Then, by moni- toring the oscilloscope dis- play, you can ensure that the signal remains opti- mally tuned even if your receiver drifts a small amount or if the noise and
Photo S, Osciltoscope display.
interference conditions change.
When using this type of display, it is convenient to have the current slicer threshold (TP-2) superim- posed on the display with one channel of the scope, but it is not absolutely nec- essary. If you have only one single-channel scope, just remember where you have set your threshold, or use an external voltmeter to moni- tor it while you display the TP-1 signal.
Alternate Tuning Method
As you probably have guessed by now, without an oscilloscope it would be very difficult to adjust the receiver for the optimum conditions described above. This does not mean that you cannot tune it to work fairly well most of the time, however. A VTVM at- tached to TP-1 also will give an indication of when you have reached maximum sig- nal strength, but its fluctua- tions with the signal will be much more difficult to irv terpret. You also will have very little ability to judge the noise conditions be- tween the pulses, but, if you
are having a problem* you
can compensate for these by doing a little trial and er- ror with the detection threshold and seeing which one works better. You will find that you must tune the receiver slowly in order to find the very narrow pass- band of the fitter.
Summary
This circuit evolved over several months of experi- mentation and testing, and i think it is a good compro- mise between circuit com- plexity and satisfactory per- formance. I think you will find, however, that while the computer can do a very good job of decoding well- sent Morse code under good reception conditions, the machine is no match for the human brain when it comes to poorly-sent code or very adverse noise or in- terference conditions. ■
References
1. Thomas. William L, "Decode Morse— With an 8080," 73, De- cember, 1977.
2. Stark, Peter A., "Design An Active RTTY Fiiter/' 73, Septem- ber, 1977.
3. Stewart, Dr. John F., "At Last! A Use For Your Computer/' 73, April. 1978.
73MagBime • February, 1982 107
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PAMOUS NOVICE LICENSE
STUDY GUIDE AND NOVICE STUDY TAPES
• NOVICE STUOY GUtDE— SG7367— by nmofhy M Daniel NSFIK. Here \s lh« most up lo da!e nov^ct guide available H is oorrrp^e v^tti Information aboul learning Morse Code, has the latest FCC airtateur ragulati^ons and tNe current FCC applicaltc^ni rorrns. mis guide fS not a quesliori/ansiAfier memanzatiOTk ^^Oyrse but rair^er it emphasises The practical s^deof geitirH] a ham license and pii£t»ng a s^atron on iha air. it re^lecls wfint \\m FCC expects a Novic^e lo know witfwut page after page of dull theory. Tho mosl Current informal ton all 1 1 availabie at last year's pnoe. (4.35
• NOVICE STUDY TAPES— CT7300— If you aie |u^ idling started In ham tm^, yoult fir>d tl tapes indispensa&ie! This up^o-thfrminute revision of irte 73 Sludy Course istheperrecl M^y to lesrn ewfythinft you r>aQd to brMze tmoggti \h& Novicit written exam. Theory, FCC regulattona and Operating sMlfs are aH covered^ and you'll be amazed at how fast you aearn us^no these tapos!
OnoelrM^teSt i% f?^ind you, the^e tap^ will go hght on boing useful, beca u set ney are packed with tri6 Eatdst In Format ion on selling up your own ham station, and getting on the air.
Thousands of people have dt^covered how easy learning from cassette can t^e^ofder rKiw and ent^r the fa&einalino world of ham fadJoJ— Set of :j— $16.96. *
Scientists have proven that v^u learn taster by listening than by reading because you can ptay a cas^ sette lapB over and over in youf spare time— even v*/hlTe you're drivingl You get more and more Irilo each t4me you hear It. You can'l progress wilhoul solid fijndamentaLs.Tnea6 three hour-long 1 apes give you aJltha bafiica you'll need to pass the f^oviice exam easily. You It have an undersiaoding ol the ba- sics which wi^l be invaiuable to you for the rest of your life! Can you a I lord to take your Novice exam witfKHjt lirsi listwlng to these tapes?
SPECIAL OFFER! Both NoTlce Ue«aB« Stud^ Guide and If ovice Studf Tapes S 19.95. Order NP7300.
^f\ General License Study Guide
OHNERAL LICENSE STUDY GUlDE-by Timothy M. Daniel MBRK, ThJs Ls the complete guide to Ihe General License. Learning rather than memorising Js the secret. This Is not a quasiion-and-answer guide that will leather dust when ihe FCC issues a new test. Jn^ stead, this book will be a helpful reference, useful long after a ham upgrades to QeneraE. includes up-to-date FCC rules and an app^llcalion form. Order yours today and talk to the world. SGT358 $6.95
# ADVANCED CLASS LICENSE STUDY aUIDE— SGlOfll — Ready to upgrade your Hcenae? To prevent retahing the FCC theory exam^ you need the 73 Ad vane ed theory guide. S5B, antenna theory, transmitters, and elect ronfc^s measuring techniques are covered in detail in this easy-to-fotlow study guide. Special modes and techniques. su*jh as RTTY, are also treaied. An engineer. \n^ degr^ \^ not necessary to master the Advanced thiofv— try thjs booh before visiting the examiner's of- fice! 9&.9&.* IPub^ished by TAB Booka previous to reoent changes in FCC exam material.^
FOR YOUR HAMSHACK
• OSL CARDS— ?3 turns out a fantastic series of QSL carda al about half the cost of having them done eise- where because they are run as a fill in between printing books and other Items In Ihe 73 Print Shop. 250 Style W— QWD250— for $B 95'; 500 Style W— OW0500— for $13.95*; 250 Style X— OX0250-for 18.95'; 5O0 Style X^QX0500: 250 Style Y— QY0250— for t8.95*; 500 Style Y— QV0500-ior $13.95," Allow 6-l£ wks, for deffvery.
• LIBRARY SHELF BOXES— These sturdy white, cor- ruga ted. dirl^e^sistant boxes each hold a fultyearof 73, Kmb&ud Mfcrocomptttffig or SB Microcomputing. With vouf order, request seU-stickrrvg labels tof any of the follow ing. 72. Kiiob&ud Micfocomputing^ W Mtcrocont- P0ing. CO, QST, Ham Radio, Pers<tnAt Computfng, Radio Electronics, Inmrfsce Age, and Byte. Order 1 — BXIOOO— for S2.00*: order 2 -7-8X2002 -for |1.50 each'; order S or more— BX 1002— for S 1.25 each*.
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MAGAZINE
• Preserve and protect your collection for a lifetime! Ort^tr these hanc^some red binders with gold lettering, $7 50 for 1. 3 for S21.75, 6 for $42 00. (Postpaid v/ithin USA. please add $2.50 per order outside USA.) Check or money orders oniy, no phone or COO. orders, 73 B Incurs. P.O. Box 5120. Philadelphlm. PA lit 41. *fiOtE — Abo«« ftddrcH for BlAdera onJj.
I
CODE TAPES
ANY FOUR TAPES FOR $15,951 $4.95 EACH
"OENEStS"
5 WPW— CT7305— Thm is ttw beginning tape for people who do not know the code at all. it takes Ihem throuot) the 2B letters, 10 numbers and necessary punctualkKi, comptete with practice every step ol the way usl^ng the newest blitz teaching techniques. It Is almost mirac- ulousl In one hour many people— including kids of ton — are able to master the code. The ease of liMmtng gJves confidence to beginners who might otherwise drop out
"THE STICKLER''
e+ WPM— CT7306— This Is the practice tape for the Novice and Tech ntc Ian licenses, it is made up of one solid hour of code, sent at thte official FCC standard (no other tape we've hea/d uses tr>ese standards, so many people flunk tf>e cod« whrni they are soddenly— under prfr&sure^facect with ehmctsrs sent at 13 wpm and »p»ced forSvppm). This tape is r>ot memonzoljle, unlike the zany 5 wpm tape, since tfie c^xja oroups are sfitirely nfidom ct>^racters aenl in groups of fiveu
13 +
■SACK BflEAKER" WPM— CT7313— Code groups mln^ tt a brisk 14
per so you wiiT be at ease when you flit down fn front of the 9tdely^ed government inspector and r>e starts ser>dl rig you plain language at oniy 13 per. You need this extra margin to overcome the panic which Is universe t in the test all u at tons. Wh^n you've spent your money and time to lake the test, you'll thank heaven you had this back- breaking tape.
■^OURAQEQUS"
30+ WPM — CT7320— Code is what gets you wtien you go for tfie Extra dasa license, it is so embarrassing to panic out just because you dkfn't prepa/e yourself witfi this tape. Though this is only one word faster, the code groups are so dttf icuil thai yoa'il aJmost faiJ asleep copy* fr^ the FCC stuff by oom(»rl9oa Users rvport ttiat thsp cert't believe how easy 20 per really is wtth this fantastk; OfMi hour tape.
"OUTRAGEOUS" 25+ WPM— CT7325— This is the tape for thai small group of overach ie vi ng hams who woul d n 't be cont a nt to almpty satisfy the code requiremenie of the EMra Class ilcense. It's the toughest tape weVe got and we keep a permanent file of hams who tiave mastered it. Let us know when you're up to speed ar»d we'll inscribe your name In 73's CW "Hall of Fame."
SSTV TAPE
• SLOW SCAN TELEVISION TAPE-CT7350— PrtZB^
winnir>g prog rams from th* 73 SSTV conteat. Excellent for Oomo! S5.96.'
BACK ISSUES
«6ACK ISSUES— Complete your collection; manv are prime collect at>les now, classics in the field! A full col- lection is an invaluable compendium of radio and elec^ tronics knowledgel
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THE 73 TECHNICAL LIBRARY
_j\rt.."i»».i*-joi-
BEHIND THE DIAL— by Bob Grove. Get more fun out of shortwave liSitenlmg with this Intoresting guide Ko rscehvers, antennas, frequeo^ie^i and interference^ $4.95/ BK7307 "
THE CHALLENQE OF 180— ts the newesi book In the 73 technical library, dedicated to i60-m$ter operating. SI Dunn provides all necessary infornnatfon to get started on this unique band. TUB all-lmportanl antenna and ground systems are described fn detail Tt^e Introduction contains fnteresting photos of Stew Perry's (the King of 160J shack. This reference Is a must for new and ex- perienced 'Top Band" operators. Pnce: $4,95/ BK7309
SSB. . .THE MtSUNDERSTOOO MODi-by James 8. WJIson. Single Stdebar>d Transmission. . thousands of us use It every day, yet it remains one of the least understood facets of amateur radio. J. B, Wilson presents several methods of sideband generation, am^ ply Illustrated with charts and schematics, which vviil enable the ambitious reader to construct his own side- band generator. A must for the technically-serious hem. $5.50.^ BKZaSI
PfiOPAOATIOh* WlZARD^S HANDBOOK— fey J. H, Nelson. When sunspots rjddled the woridwfde com- munications networks of the 134Qs, John Henry Nelson lool^ed to the planets for an answer. The resuit was a theory of propagation forecasting based upon in- terplanetary alignment that made the author the most rehable forecaster in America today. The book provides an enilghtened took at communications past, present, and future, as weH as teacfilng the art of propagation forecasting. 16.95.' BK7302
• TOOLS & TECHNIQUES FOR ELECTRONICS— BK7348'— by A, A. Wicks is an easy-to-understand book written tor the beginning kit bulider as well as the ex- perienced hobbyist. U has numerous pictitres and descriptions of tne safe and correct ways to use basic and specialized toots for electronic projects as well as specialised rrtetal working tools and the chemical aids which are used in repair shops. $4.^.*
WORLD PRESS SERVIQi FREQUENCIES-by Thomas Harrington. Can't wait to hear the evening news, or are you wondering about the news that you aren'f hearing? Receive by Radio Teletype (RTTY} aft the worid news and financial happenings from the world cepitois on a 24 hour aday basis. This bookgives you the frequencies and times of broadcast of such news services as AP, UPI, Reuters, TASS, VOA and London Press. Also Included is an introduction to RTTY with information on equipment, antennas, abbre- viations— everything you need to get started in RTTY. S5,95*BK1202
NE^^
FOR THE
CONTE
THE CONTEST COOKBOOK— reveals the secrets of the contest winners {domestic, DX, and specialty con lests), complete with photos and diagrams of equipment used by the top scorers. Find out how to make 1 50 contacts in one hour, $5.95." BK7308
THE NEW WEATHER SATELLITE HANDBOOK- by Dr. Ralph E. Taggart WBeOQT Here is the completeiy updated and revised edition containing all the informa- tlon on the most sophisticated and effective spacecraft now In orbit, this book serves botb the ex- perienced amateur satellite enthusiast and the new- comer, It Is an Introduction to satellite watching, pro- viding all the Information required to construct a com- plete and highly effective ground station. Solid hard- ware designs end all the instructions necessary to op- erate the equipment are included. For experimenters who are operating stations, the book details all proce- dures necessary to modify equipment for the new ser- ies of spacecraft. Amateur weather satellite activity represents a unique blend of Interests encompassing electronics, meteorology and astronautics. Join the privileged few in watching the spectacle of earth as seen from space on your own monitoring equipment. Se.95." aK7363
INTERFERENCE HANDBOOK— by William R. Nelson, WA6EQG— This timely handbook covers every type of
RFI problem and gives you the solutions based on
Kractlcail experience. Covers Interference toTV, radio, i-fl, telephone, radio amateur, commercial and CB equipment Power line interference Is covered in depth —how to locate itr cure It, work with the public, safety precautions, how to train RF/I investigators. Written by an RF] expert with 33 years of eKperlence, this profuse- ly illustrated book is packed with practical easy-to- understand Information. aKl23l3 $6.95
IC OP-AMP COOKBOOK— by Walter G, Jung. Covers not only the basic theory of the IC op amp In great detail, but also Includes over 250 practical circuit ap- plications, liberally iiiustrated. 592 pages, SVi xBV?, softbound. $14.95." aK102a
OWNER REPAIR OF RADIO EOUIPMENT-by Frank Glass K6RQ Here's a book that will teach you an ap- proach to troubleshooting without a sh@ck full of test equipment. Written In a narrative, non-mathematical style, it will encourage you to successfuily fix your own rig problems BO to 90% of the time. Even if you don't want to fix, you can learn a lot about how things work and fail. Add to your iJbrary and personal expertise. $7.95/ SK7310
HANDBOOKS
FOR THE HAMSHACK
THE TEN METER FM HANDBOOK- by Bob Hell K9Eia This handbook has been pubilshed to help the ten meter enthusiast learn mora about the many methods of con- versions and iricKs that are used to make existing units work better. Join the great "tlnkerers" of the worldon ten FM and enioy the fantastic amount of fun in communi- cating with amateur stations worldwide on ten meter FM. *i.95.* SK1190
THE PRACTICAL HANDBOOK OF AMATEUR RADIO FM REPEATERS- by Bill Pasternak WA6ITF {author of 73 r^agazines monthly column 'Looking West'') This is the bOOK for tiie VHF^UHF FMer, compiled from material submitted by over a hundred Individuals, clubs, organizations and equipment manufacturers. A "must have" for your ham shack shelf. SUBB* BK1 185
The 7$
Test Equipment Library
VOL, I COMPONENT TESTERS— How to build tran- sistor testers (8j, diode testers f3)p IC testers [3), voltmeters and vTVMs {91, ohmmeters {8 different kinds), inductance |3K capacity {9), G measurement, crystal checking {6), temperature (2), aural meters for the blind (3), and ali sorts of miscellaneous data on meters. . .using them, making them mors versatile^ making standards. Invaluable book. $4.95.* LB7359
VOL II AUDfO FREQUENCY TESTERS- Jam-packed with ail kinds of audio frequency test equip ment. If you're into SSB, RTTY, SSTV, etctnis book is a must for you . . .a good book for hi-fi addicts and experimenters, tool $4.95,* LB7360
VOL. Ill RADIO FREQUENCY TESTERS— Radio frequen- cy waves, the common denominator of amateur radio. Such items as swr, antenna impedance^ tine impedance, rf output, and fieid strengtii; detailed Instructions on testing these Items Includes sections on signal generat- ors, crystal calibrators, grid-dip oscillators, noise gen er ators, dummy loads, and much more. $4.^." LB7361
VOL. IV IC TEST EQUIPMENT-Become a troubleshooting wizard! in this fourth volume of the 73 TEST EQUIPMENT LIBRARY are 42 home construction projects for building test equipment to work with your fiam station and In servicing digital equipment. In- cludes a cumulative Index for all four volumes for the 73 TEST EQUIPMENT LIBRARY. $4.95/ L873fi2
RF AND DIGITAL TEST EQUIPMENT YOU CAN BU ILO— BK1044— Rf burst, function, square wave gen- eratorsn variable length pulse generators — 100 kHz marker,, l-f and rf sweep generators, audio osc, afi'rf sig- nal injector. 146 MHz synthesizer, digital readouts for counters^ several counters, prescaler^ microwave meter, etc. 252 pages. $5.95,' BK1044
"Use the order card In this magazine or itemi2e your order on a separate piece of paper and mall to: 73 Radio Bookshop • Peterborough NH 0345&. Be sure to include cheek or detailed credit card information. No C.O.D. orders accepted. All orders add J1.S0 handling first book. $1.00 ^acU additional book, $10.00 per book foreign airmail, Please allow 4 6 weeks for de 1 1 very . Q u est i o n s reg ard t n g your order? P lease w ri te to Customer Ser vi c e at t h a above ad d res s. ^ Pr I ces subjecttochange on books not published! by 73 Magazine^
FOR TOLL FREE ORDERING CALL 1-800-258-5473
ANTENNA BOOKS
/'
THE WELL BgUIPPBD
HAM SHACK
PRACTTCAL ANTENNAS FOR THE RADIO AMATEII
^A manual describing how to equip a htm stition with a su liable antanna. A wide range of antenna topics, systems r ^^^^ ac^cesaorles are pfeaent^d giving the readi^r some food for 1 bought and practical data for con- struciioa Designed to aid the experienced ham and novtce as well. Only BK1015 $9.95/
VHF ANTENNA HANOeOOK-The new VHP Antenns H§n{^bQQk details the theory, design, and cOn$tructl'On of hurtdreda of different VHF and UHF antennas... a practical book written for the average amateur who lakes }oy in buHcfing, not full of ^rinp^ex formulas for itie design ertgineer. Packed wfth fsbiilous antenna projects yoy can buikf. f5 95/ 3X7368
73 DIPOLE AND LONQ-WIRE ANTENNAS~bv Edward M Nolt W3FOJ. This is the hrst coriaction of virtual ty every type of wire antenna used ^ amatwrs. Includes dlm«rtslons,conrigyration3,an(f detailed construction data foe 73 d Iff a rant antenna types. Appen drees describe the consi ruction of noise brl<dgea, fme tuners, an<} daia on measuring resonant frequency^ velocity factor, and swr, $5,50/ BK10ie
• ALL ABOUT CUBICAL QUAD ANTENNAS {2n4 edi- tion)—BK1 196— The ^'Clftsaic" on Quad deslgji, theory, cronslructfon, and operation. New 2nd adlttofi contains new fe»d and matching systama and r»»w data. tSJS/
• BEAM ANTENNA HANDBOOK (New &lh •dlllon}— BK1 1i7— Vagi beam theory, construction and operation, tnfomialion on wife beams. SWR curves and matching systems, A "musi^ tor serious DXefs, S5.96"
• VHF HANDBOOK FOR RADJO AMATEURS— BK 11 96 — Contairts information on fM theory, operatkm aiKf equipment. VHf a ntenns design and construction, satef- lita-EME. arxf tn«^ rvewest solid-^tate circuits. V&95*
• THE RADIO AMATEUR ANTENNA HANDSOOK- BK11W— Aii at>out wire antennas, beams, tuners, baluns, coax, radial:^. SWR and towers. Clear artd com- plete information, $6.9^'
• SIMPLE, LOW-COST WIRE ANTENNAS FOR RADIO AMATEURS— BK 1200— Atl new data and every thing you want to know about low-cost, muiti-baind antennasjnex- l>enslV0 beams, "invisible" antennas for hams In 'Uough" locations. $6.95''
COOK BOOKS
TTL COOKBOOK— by Don Lancaster. Explilne what TTL Is, how It works, and how to use it. Discusses prac- tical applications, such as a digital counter snd display system, evants counter, ^Eectronic stopwatch, digital voltmeter and a digital tachometer. iSo/ BK1063
CMOS COOKBOOK— by Don Lancaster Details tt>e application of CMOS, the low power logic (amrly suitable for most appHcatlons presentiy dominated by TTL Required reading for every serious digital ex- penmentar! $10.50/ BXlOll
TVT COOKBOOK— by Don Lancaster. Desorfbes the usa of a standard television receiver as a micropro- cessor CRT terminal Explains and describes charac- ter generation, cursor control and interface Informa- tion in typical, easy-to-understand Lancaster style. 59^5/ BK1064
SPECIAL OFFER
Chmrtof
imiTED STATES AMATEUH
RADIO FRIYILEGES
hf claaa ef Uceoae* cmi^itoo trpc. mad frtr qaencj from 160 thrtt 2 meterA, £EH!ltidij]^ pTO- "rlalon Tor the nev 30, 1 7, and 13 meter banda. TliJi 32 X a« la. tw«lve-<^olor cluut U Uic flrat of Ita kind to be both InfonnatlTC and decora- tlve. S3.00 value. Qoij $1.9& vltli the puT' cliaa« of 1 or more book* from the Radio Soofe- shop* (9upplle» limited, order aow.) CH7300S1.0fl.
• HOW TO DEFEND YOURSELF AQAINST RADAR— eKl2Dl — by Bfuce F, Bogner and James R Bodner; a lawy^ and radflj- expert, This book gives you the ammunPtion to challenge the radar "evidence" that usually leads to a apoeding conviction. The ma^or part of the booK details the inner workings of radar— you'U beoome mofe of an ejc- pert than most pollcs officars and judges. The rernalndflr of I he book out lines how to defend youraalf against a speeding ticket— the observations, measures and testimofty you must obtain to defand yourself wfthout the help of a lawyer The price is a tot less ttmn a fme! $6-95'
WOflLD REPEATER ATLAS— Completely updated, ovef 230 pages of repeater listings are indexed by location and frequency. More than SO map^ pinpoint 2QQQ repeat- er locations throughout the USA. Foreign listings In* duds Europe, tiie Middle East, South Amirlcan and Africa, S4,»5* BK7aiS
THEMAQICOF HAM RADfO- by ctenoid Swank WSHXR begins with a brief histoiy of amateur radio arnlot Jerry's in^vemervt in it. Part 2 detilis many of ham radio's I*af0*c mo<i>entfi. Ham<iom s dose ties wtth the cont^ nent Of Antarctica are th« subfaci of Part 3. In Part 4 ttw Strange ar>d humorous sides of ham life get tf^tr due. And what of the ftjiure? Pari 5 peers into tfis crystaJ bill. S4.95/8K7312
A QU1DE TO HAM RADlO-by Larry Kahaner WB2NEL What s Amateur Radio all about? Vou can learn the basics of this fascinating hobby with this excellent beginner's guide. It answers the most frequently asked questions in an easy going manner, and il shows the best way to go about getllng an FCC license, A Guide to H«m Radio IS en ideal introduction to a hobby enjoyed by people around the world ^ $4.95/ SK7321
WORLD RADJO TV HANDaOOK 1ii2, 25TH EDITION — This book is the bible pi international broadcasters, providing tf^ only authoritative source of exact informa- tion about broadcasting and TV stations world wide. Th^S ?9S1 edftion Is completely revised, giving conv Dfihensive coverage ot short, medium and long wave, 560 pages of vital aspects of world listening liaso. &Klia4
MICROCOMPUTER BOOKS FROM 73
C(HMPIJTEK
GAMES
ftom
1-:* rjoucj microconnputin^
• SOME OF THE BEST FROM KfLOBAUO/MICROCOM- PUTINO— 6K731 1— A collection of the best artiqles that have recently appeared In Kilobaud/ MICROCOMPUT- ING. Included Is material on the TRS-80 and PET syslems, CPfM. the 8080/8085/ZeO chips, the ASR^3 t«r* minal. Data base management, word processing, text editors and f lie structures are covered too. Programming techniques and hardcore hardware construction proj- ects for modems, high speed cassette interfaces arbd TVTs are aJso ir^cluded in this larige format, 200 plus page edltioti. 1 10.96,'
1 40 COMPifTER GAMES— BK73B1— Forty D«mes In all in nine different cateoories Games fer targe arid small systems, and even a section on cafeuletor gam«s. Marty versions of BASIC usad and a wide variety of systems represented, A must (or the senous computer ^mes- mail. S?.9€*
• THE NEW HOBBY COMPUTERS- BK 7340 -This book takes it from where "H08BY COMPUTERS ARE HEREI" leaves off, with chapters on Laroe Scale Integra- tion, how to choose a microprocessor chip, an IntroouC' tlon to programming, low cost I/O for a computer, com- puter arlthmstic, checking memory boards... and much, much moral Don't miss this tremendous value! Only $4.95/
• UNDERSTANDINO AND PROGRAMMINQ MfCRO^ COMPUTERS- BK7a&2- A valuable addition to vour computing llbfary. This two-part text Includes the best articles that have appeared in 73 and Kilobaud Microcomputing magazines on the hardware and soft- ware aspects of microcomputing. Well-known authors and well-structured text helps the reader gat Invoivsd. $10.95*
HOW TO BUILD A MICROCOMPlTTER—AliD REALLY UNDERSTAND rT— by Sam Creason. Th« electronics hob&yist who wants to build hrs own mlcrocomputef system now has a practicsl "Kow-To" guldet>oOk. This book Is a combination technical manual and progfam- ming guide that takes 1h« hobbylsf step^-step thrtHK}h iha d«slgn. construction, testing, and debugging of a complete microcomputer system. Must reading for anyone desiring a true understanding of small computer systems 59,95/ BK7352
HOBBY COMPUTERS ARE KEREilf you want to come
up to speed on how computers work—hardware and software— this la an excellent book. It starts with fun- damentals and ©xplalna the circuits and the basics of prog ram m in o, along wllh a couple of TVT construction projects, ASCII. Baudot, etc This book has the hlohest rpcommendalions as a teaching aid. $4.95/ BK7322
*Use the order card in this magazine or itemize your ordar on a separate piece of paper and mall to: 73 Radio Bookshop • Petert>orough NH 03458. Besuretoir>clud6Check0f detailed credit card information No C.O.D. orders acGSptSd, Ail orders add It. 50 harKll^ng first book. Si. 00 each additional book, SlOOO per book foreign airmail, Please allow 44 weeks for delivery. Questions regard! rig your order? Please write to Customer Service at th^aDOVe address^ (Prices tyib|ict to change or^ books r»at published by 73 Magazine.}
FOR TOLL FREE ORDERING CALL 1-800-258-5473
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70 Cubic Communications, ........ 57
307 Debco Electronics. 133
[>efT»ch Electronics/ A£ A 150
t>esklop Computrng 141
477 DFO SKSteffTO*^..*. 1T9
DGMEf^cifonlcsjRC- .,,,,,»., 142
* Digit tl Research Parts. ITS
43 ONE, Inc 13S
425 Doppler Systems. . 1 54
|
■ |
R, L Drake Compsnjf. |
..91 |
|
• |
DXpedilions International. . . . |
.62 |
|
453 |
E'GhE^i Inc.. ...... ....... |
.142 |
|
i |
80 MIcrocompuliriQ |
.144 |
|
4 |
Electronic Equipment Bank, . . . |
.145 |
|
447 |
Elect ran EC Hobby innovations. |
.101 |
|
62 |
Electronic Recyclers o( MA |
153 |
|
400 |
Engineering Consulting . |
154 |
|
91 |
Erickson CommunicatJOfiS. . . |
..&2 ,149 |
|
eTCo tiectronics. |
||
|
m |
Fexscan, Ino,,.,,,,, ,, |
,138 |
|
-439 |
Ben Frankrin Eiectrofites, .-... |
TW |
|
323 |
Fo*-Tari§oCQrp.. |
96 |
|
44£J |
Fronlier Eniefprises |
irv\ |
|
tOl |
G It K Amateur Supply |
..23 |
|
37 |
Gtllaspielt Associates |
.99 |
|
•■ |
Gefn Ouad Products Ltd, .... |
.75 |
|
i |
Global Electronics, . ....«^.«*, |
..m |
|
417 |
Gotham Antenna. . ■ |
.155 |
|
4 |
Grove Enterprises. |
..45 |
|
P |
HMRlt |
154 |
|
fl6 |
HSR CommuntceHons. ♦...., |
m |
|
345 |
Hal Communications. . . ^ |
.17 |
|
479 |
Hal Coftimunications. |
.136 |
|
31 |
HalTronlst. |
137 |
|
■ |
Ham Radio Outiei |
. .3 |
|
33 |
Hamtfonics, NV |
.173 |
|
460 |
Harfdi-Tek |
154 |
|
18 |
Hastings Antenna. ......... |
..m |
|
55 |
Heath Compeny ...,...,.. |
..37 |
|
303 |
Healh Company..,,, |
...9 |
|
34 |
Her^ry Radio. |
55 |
|
72 |
bigain Electroniics. . » . , . |
m |
|
316 |
Myosin Div. ot Tetex Ccmm. |
|
|
..*, 47.a4,BS |
||
|
m) |
Hooiler Eiectf onlca. ,........, |
,,95 |
|
* |
Hustler, tnc ...,.,.., |
..43 |
|
474 |
MX Equipment |
.49 |
|
■ |
ICOM ,,,.., Gov 11,29 |
|
|
■ |
iWL - ..„. |
,/15 |
|
7B |
Independent Crysta! Supply Co. |
.153 |
|
6 |
IfKty Amateur Suppty. ,...,.,,. |
.las |
|
35 |
lnto-Tech._. ,.._,,...,_,.,, |
.52 |
|
445 |
instant Soflwant |
|
|
De*^s. |
. 103 |
|
|
Amateur Radio Programs |
||
|
--^^- 102,109 |
.109 |
nS. Na P»o«
27 Iscan Engineering. 155
409 JDR MfCrodevJcas ..,..,,.116, 117 25 JJT D^stribLiilnQ. .............. ISS
38 Jameco Electronics. . , 177
KB Microcomputing. 144
Bl KDK Distributing — .... . . , 19
4?6 KDK Dislnbulinfl Hi
Kantronics .... 150
• Ker^wood, Gov iV, 7 4 t-acue Communications
Electronics ,.♦.»*»,,,♦ ...«,..•- . I5t 457 Uwis Construction Co.. . 100
Live Vie Sarelltte. lr>c.. ..9&
480 LNR Communications.... 135
53 Luly Assoctales. ...... >-. 99
96 M&MEJecironicsSaJes ...32
47 MFJ Enterprises
67.69.71,73,75.77.66
47B MFJ Enterprises- . , 136
45 MHz Electronics 156-157
77 M- Squared Engineering. ....... ISO
56 Macaw Electronics, — 146
44 Macrotronics, Inc 75
45 Madison Electronics Supply. . . , 151
4ft Maggiore Electronic^. 140
139 Memphis Amareur Etectroniios . 28
49 Micro Control SpeciaUtes 77
51 Microlog . - 79
313 M^cfo Wanagiiiiant Syst^mfi. .156
50 MicJ0CTaflC5*p.. .....,.,.. ea. 156
52 Mid-Com Electronic* 148
308 J, W. Miller Div./Bell IndustriesSI. 33 ' Mirage Comm. Equip., Inc, .,.,,. 73
31 S National Comm. Group tOO. 139
412 Nemal Electronics^ , . , . — ... 46 327 Horciluncl & Asaodaiea. 9S
* Orbit Magazine,.,,,., ,.,,, 137
P.C. Electronics 100
Palomar Engineers,,,,.., ,.4
404 P. B, Radio Service 152
421 Pliillips Tech Electronics i53
300 Pipo CofnmuntcalionS. - . 153
96 Powef Gain Antennas. . 33
459 QRO EnQJiie^ring T3B
9i QRZ Scait, Inc. 49
60 Ouest E^ec1ionice-.-...^^-..-. 166 21 R.W.D.Jnc- t4i
R.&NdL Page
61 Radio Amateijr Can ltxx>k, Inc 33 Radio Publications . ... 1 19
381 Radio Systems Technology I Inc. 153
454 RadiokM 69
397 Radio World 156
Radios Unlimited^AEA. .... ,24
62 Ramsey Electronics. . , 1^. 174
4ia RollnDistfibutocs 24
96 S. G. Doscoe. . 3B
376 SMP 151
65 S-P Amateyr Radio Service — ..71 64 SemtcortdbCtors Surplus. 170,171
73 Magazirbe
Books , .110-113. 143, 144
DteaiemAd. .. ..,.,..*.. HO
"Mo¥ing ...,,♦*,,» 137
SubscHpttons . - , . .^ * . . . 1 15, 154 University Microtilms. . . 155
Sherwood Engineering t65
433 Skytec... 154
367 Slep Electronics 139
309 Spacecoast Research Corp.. * - . . 98
* SpectromcSj Inc - — 71,176 6fi Spectrum Communications. .61 436 Spectrum international. Inc. 100, t39 32 Steiimaker EniefpriseSw t55
30 Stfujt Corp,,*..,... 153
69 Surplus Electronics Corp . 155
316 Tehex Conrnuimcations, Inc.
, 47,64,85
Ten-Tec. Inc^ 135
328 Texas MleroironlcSv , . . 49
449 The Main ShacK. i52
57 The Tuned Antenna Co. ... 67
76 Trac EleclfOnics 43
88 Tufts Electronics . 60, SI
* Universal Communications 140
* Van Gorden Engineering ^ . 43
481 Valor Enterprises. ......... ^ .. . 136
31 1 Vanguard Labs 153
90 VoCom Products Co.. ^......,...^.39
302 W-S Engfneerir>g. . 73
79 Wacom Products......... ...... 150
Wi^sexPutJlishingCo,. 138
29 Windwaid. Inc .- 24
63 Yae$y ElecmmiCS Co ...Covin
BooksrETC
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114 73 Magazine • February, 1982
WHAT WILL YOUR NEW
RIG BE LIKE?
Read 73 and Find Out
The magic of digital electronics is coming to ham gear . . , and you'll be able to read about these developments in 73. There probably will be more changes in ham equipment in the next few years than ever before in history. You'll see these changes coming in 73, where you'll read about the experiments and pioneering. 73 has more articles than any other ham magazine . . , often more than all the others combined.
When sideband got started, it was moved along by the many pioneering articles in 73. In the 60s it was solid state, with sevfcfal times as many articles on the subject than in all the other magazines combined. When repeaters and FM got going about ten years ago there were over five times as many articles on the subject published in 73 as in all other ham magazines combined . . . and you can see what changes that brought to hamming. Now we're looking at exciting developments such as narrow band sideband for repeaters . . . which might give us six times as many repeaters in our present bands. We're looking at automatic identification systems which may make it possi- ble for us to read out the call letters of any station tuned in . . . and even the development of self- tuning receivers.
Will stereo double sideband techniques make it possible to have up to 30 times as many stations within a given HF band as is now possible? Hams will be experimenting and reporting on these developments in 73. 73 is an encyclopedia of hamming. . .present and future. . .and just a bit of the past, too.
Without the endless fillers on station activities and club news, 73 is able to
publish far more information. . .valuable information. * ,on hamming and r-— ^.,..-.,_
ham equipment. | ^|U--. , : '^^
You may or may not be a pioneer, but you certainly will want to keep up t^S^^^^m^H
with what is happening and what the new rigs are going to bg hke. And, frank- |- w^^^
ly, your support of 73 is needed to keep this type of information coming. fes -/jfinH^
"tf ©©o bill me for 1 year of 73 Magazine at 325.00
^ 32aB6
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Address.
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Canadian S27/1 year only. US funds. Foreign $35/1 year only. US furds
Please allow 4 to 6 weeks for delivery 73 Magazine#PO Box 931»Farmingdala NV 11737
ISMagazine * February, 1982 115
4116-200ns
ALL MERCHANDISE 100% GUARANTEED!
CALL US FOR VOLUME QUOTES
|
EFROMS |
Eieh |
8 p«« |
||
|
1T02 |
256 1(8 |
itfisj |
4.95 |
4,50 |
|
tim |
1024 s a |
(450n»j |
2.93 |
2.75 |
|
275B |
1C^4»8 |
<5V) (450na) |
9.95 |
8.95 |
|
TMS2S16 |
2max8 |
(5V) (450n») |
6-95 |
5.95 |
|
2716 |
2046x8 |
iSV) (4mm] |
5.50 |
4,95 |
|
2716-! |
2048x8 |
iSVy (SSOnsJ |
5,00 |
8.50 |
|
TMS2716 |
2048 itB |
(450ns) |
995 |
8.95 |
|
TMS2532 |
4095x6 |
(SV^ (450n») |
12.95 |
11.^ |
|
2732 |
4096x6 |
{5V) (450nsj (200 ns J |
CALL |
|
|
2764 |
8192 >f 6 |
tSV} (450rh8) |
CALL |
|
|
DYNAMIC RAMS |
100 pem |
|||
|
^027 |
4096 K 1 |
(250ns) |
2 50 |
2.00 |
|
411&120 |
16.384 X 1 |
(120ns) |
3/29.95 |
CALL |
|
4116-150 |
16,384 X 1 |
(iSOns) |
8/16.95 |
1.95 |
|
4116 200 |
16,384 X 1 |
1200 ns) |
3/15.95 |
1.80 |
|
4115-300 |
16,384 X 1 |
(BOOns) |
3/14.95 |
1.75 |
|
4164 |
64,536 X 1 |
(200ns) |
CALL |
|
|
STATIC RAMS |
100 pc« |
|||
|
2101 |
256 k 4 |
(450ns) |
1.9S |
1.86 |
|
2102-1 |
1024 n T |
f4S0ns} |
.89 |
m |
|
21LQ2 4 |
1024x1 |
(LP)(450ns> |
1.29 |
1.15 |
|
21L022 |
1024 X 1 |
(LP) 1250ns) |
1.G9 |
1.55 |
|
2111 |
256x4 |
(450fl») |
299 |
2.49 |
|
2lt2 |
256x4 |
(450ns) |
2.99 |
279 |
|
2114 |
1024 X 4 |
f450n5} |
8^16-95 |
1.95 |
|
ai14L2 |
1024 « 4 |
(LP) iSOOn*) |
a/t9-95 |
2^ |
|
2114L-3 |
1024 X 4 |
(LP>i300ns) |
S/ta.95 |
2?6 |
|
21141-4 |
1024X4 |
(tP) i450n*) |
8/17.95 |
210 |
|
2147 |
4096 X 1 |
(55n3> |
9.95 |
CALL |
|
TMS4044-4 |
4096i1 |
(450*is) |
3.49 |
3.25 |
|
TMS4044 3 |
4096xt |
pOOns) |
3.99 |
3.7S |
|
TMS40L44-2 |
4096x1 |
(LP} (200nfl^ |
4.49 |
4.25 |
|
TMM201$ |
2048x3 |
(200ns) (150ns) |
CA1I |
|
|
HM6116 |
2048x6 |
(200ns) ( iSOns) (I20nsj CALL |
CRYSTALS
LP = LOW POWER
74LS00 SERIES
74LS00
MLS01
74LS02
74LS03
74LS04
74LS05
74LS0S
74LS10
74 LS1 1
74LS12
74LS13
74LS14
MLS15
r4LS20
74LS21
74LS22
74LS26
74LS27
74L5ae
74LS30
74LS32
74LS33
74LS37
74LS38
74LS40
74iS42
74LS47
74LS48
74L&49
74LS5!
74LS54
74LS55
74LS63
74LS73
74LS74
74LS75
74L:576
r4LS78
74LS83
74LS85
74LSa6
74LS90
74LS91
74LS92
74LS93
74L595
?4LS9B
74 LSI 07
74LS109
74LS112
74LS113
74LS114
74 LSI 22
74LS123
74 LSI 24
74LS125
74LS126
74LS132
74LS136
74LS137
74LS13e
74LS139
74LS145
74LS147
74 LSI 48
74LS151
74LSt53
74LS154
74LStS5
74LST56
74LS157
74 LSI 56
74LSieO
74LS161
74 LSI 62
74 LSI 63
74LS164
74 LSI 65
74LS166 741S168 74L6169 74LS170 74LS173 74LS174 74 LSI 75 74LS181 74LSia9 74LS190 74LS191 74LS192 74LSt93 74LS194 74LS195 74LS19B 74LS197 74LS221 74LS240 74LS241 74LS242 74LS243 74LS244 74LS245 74LS247 74LS24B 74L5249 74LS251 74LS2S3 74LS257 74L&258 74LS259 74LS260 74LS266 74LS273 74LS27& 74LS279 74L&2eO 74LS2a3 74LS290
74LS293 74LS295 74LS2^ 74L&324 74LS352 74L3353 74LS363 74LS364 74LS365 74LS36e 74LS367
74LS36e
74LS373
74LS374
74LS377
74LS378
74LS379
74LS385
74LS38e
74LS390
74LS3g3
74LS395
74LS399
74LS424
74LS447
74LS49D
74L3668
74LS6B9
74LS670
74LS674
74LS6a2
74LS6S3
74LS684
74LS685
74LS688
74LS6e9
81LS95
eiLS96
aiLS97
81LS9S
|
32 768 KHZ |
3.95 |
|
1 0 MHZ |
495 |
|
1 8432 |
4.96 |
|
2.0 |
3.95 |
|
2 097152 |
3,95 |
|
24576 |
3.95 |
|
3.2768 |
3.95 |
|
3579545 |
3.95 |
|
4 0 |
3 95 |
|
5.0 |
3.95 |
|
5.06BS |
3.95 |
|
5 185 |
3.95 |
|
5.7143 |
3.95 |
|
6.SS36 |
3.95 |
|
80 |
395 |
|
10.0 |
3.95 |
|
14,31818 |
3.95 |
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18.0 |
3.95 |
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18.432 |
3.95 |
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20.0 |
3.95 |
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22.1184 |
3.95 |
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32,0 |
3.95 |
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MISC. |
f |
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12.50 |
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11C90 |
13,95 |
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XR2206 |
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7 95 |
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900 |
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MC4024 |
396 |
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MG4044 |
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9.50 |
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7107 |
1295 |
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76477 |
3.95 |
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8038 |
396 |
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95H90 |
799 |
|
9602 |
150 |
January Specials
DISC CON- TROLLERS
1771 1791 1793 1797
24 95 36 95 44.95 54.95
UARTS
AY3-1014 695
AY5-1013 3.95
TR1602 4,95
IMG402 7 95
INTERFACE
erae im
eT28 2 49
flT96 .99
aT96 jgiB
6T97 .99
8T98 .99
OM8131 2.9S
0S8636 1.29
CLOCK CIRCUITS
MM53e9 3.95
MM5375 3.95
MSM5832 7.45
7207 7.50
7206 15.95
CONVERTERS
MCI 408 L8 4.95 DAC-0800 4.95
ADCQa04 4.9i
Z^OAGPU
Z-80A-PIO
8214
8216
6800
6810
6.00 6,00 2.95 1.50 4.95 3.95
IMS 40L44-20 4096 X 1 low power 200ns RAMS
By Texas Insuumems ■ not equivalent pari number made by another manufacturer as sold by oihers:
4.49 each 125.00/32 pes.
Spactali and Jangiry 31 , 1 962 P36ast stili "Jcnyiry Sp«cials'^ whvrt ofdarirtQ
800-538-5000 800-662-6279
(CALIFORNIA RESIDENTS^
CALL JOR eeFORE YOU BUY! WE WILL BEAT ANY COMPrnTORS' PRICES
CMOS
74C00 74C02 74C04 74C08 74C10 74C14 74C20 74C30 74C32 74C42 74C48 74C73 74C74 74076 74C83 74C85 74C86 74C89 74C90 74C93 74C95 74C107 ^40150 /4C151 74C154 74C157 74C160 74C\Bl 74 CI 62 76C163 74C164 74CtK 74C173 74C 1 74 74CT75 74C192 74C193 74C195 74C200 74C221 J4C373
74C374
74C901
74C902
74C903
74C905
74C906
74C907
74C90B
74C909
74C9tO
740911
74C912
740914
74C915
740918
74C920
74C92t
74C922
74C923
74CB25
74C926
74C927
74C928
74C929
74C330
4000
4001
4002
4006
4007
4006
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4034 J035 404D 4041 4042 4043 4044 4046 4047 4049 4050 4051 4063
4068 4069 4070 4071 4072 4073 4075 4078 4078 4081 4082 4085 40B6 4D93
6502
65C2
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116 73Magazine • February, 1982
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VIStT OUR RETAIL STORE!
TERMS: For shipping include SZOO for UPS Ground, S3. 00 for UPS Blue Label Air £10,00 mirnmum order Bay Area fesidenls add 6^/? % sales tax. Californta residents add 6% sales ta)( We reserve the nghr to limit quarittties and sub- siltute manufacturer Pnces subject to cfrange without notice. Send SASE for complete fiSL
t^Se€ LtSt of Aitlfeftise'^s or} page T T4
73 Magazine • Fedruary. 1982 117
REVIEW
KDK FM-2025 A TWO-METER FM TRANSCEIVER
When you think about two- fneter transceivers^ what brand names come to rnind first? Chances are, you'll name one of the big "full line" Imported labels- There is nothing wrong with this except that you may be overlooking some of the other guys. What about firms like Azden and KDK? Both concen- trate on selling a specific but high-quality line of radios. Until recently, I dismissed firms like these as "also-rans." Then I had a chance to revievw KDK's new FM-2025A two-meter FM trans- ceiver. Now Tm a firm believer.
The FM-2025A is the latest in a series of two-meter mobile rigs that are manufactured by Kyokuto DenshI Company and imported into the United States under the KDK name. The 2025 represents a rather substantial departure from the earlier models, whfch included the 201 5R, a great rig once you modified it. The staff at KDK has learned its lesson well; the FM- 2025A offers many of the features that today's ham ex- pects yet it remains simple and straightforward to operate.
Diode Matrix Programming
Like many of its modern day counterparts, the 2025A utilizes microprocessor control. In what seems like a step into the past, KDK has chosen to use a binary- coded^decimal diode (BCD) ar- ray to act as a program for the computer. Shades of the venerable I com IC-22S. Or is it? Twenty-five diodes are used to program such functions as the loW'frequency band edge, high- frequency band edge, transmit high-frequency band edge, a choice of S-kHz or 12,5'kHz steps, the standard repeater off- set, and band-scan step size. The unit comes factory pro- grammed rn a manner that will appeal to the vast majority of North American users. However, if you move overseas or have a need to operate outside of the US amateur allocation, it's a straightforward task to reprogram the KDK to meet your new needs.
118 73 Magazine • February, 1982
If you are like me^ most of your two-meter operating is done on a few local repeaters with occasional forays to other machines if you're traveling- Perhaps the easiest way to use the KDK IS to program your favorite machines into the memories. There are two sets of memoryp five channels each. You can use the channels in- dependently or in a duplex mode where you receive on the "A" channel and transmit on the "B'' selection. Since I frequent only a few repeaters, I find myself us- ing the duplex mode. That way, I don't have to worry about switching the repeater off- set selection when 1 change frequencies.
If you use more than five channels on a regular basis, then yoy may want to make full use of the ten memories by employing the offset switch for everything but the repeaters with oddball splits. The FM- 2025A includes a nicad battery that provides internal backup for the memory when the radio is switched off. The infinitesi- mal 57'nano-ampere current drain allows the battery to last for as long as one year between charges.
Scanning
The FM-2025A offers two modes of scanning. You can search the ten memories for an open frequency or for a frequen- cy In use. When the channel changes status, the receiver
starts scanning again. If you want to lock the rig on frequen- cy, just flip the scan control to the HOLD position.
The same optfons are avali- able in the band-scan mode. The scanning starts with the fre- quency stored in memory A5 and proceeds upward to a limit determined by the contents of B6. But you can't fool the rig; if the B5 frequency is lower than the A5 selection, there will be no scanning.
The nice thing about the KDK's band scanning Is its zero detector. This ensures that receiver scanning stops only on the center of a signal. The only difficulty I encountered came when I tried to scan near 144.000 MHz. An internal spur caused a false locking there.
One useful 2025A extra is a built-in tone switch. An internal switch allows you to select be- tween a continuous tone or a hatf'Second lone burst. There is no need to run out and buy a new encoder if your favorite machine goes private. There is easy access to adjustments for the tone generator's frequency and output level
Procedures like this are ex- plained well in the instruction manual Unlike many manuals that accompany new gear, the KDK book is written with the assumption that the reader has some intelligence; it presents more than just an idiot's guide to installation. You'll even find four pages of technical and ad- justment Information plus a larger-than-usual schematic diagram.
The KDK's construction is nothing short of rugged. The vast majority of the rig's cir-
The KDK VHF FM-2025A transceiver.
cuitry Is on two boards, with the digital based control circuitry on one and the rf blocks on the other. The lack of interconnect- ing wiring harnesses and ca- bling leads me to tielieve that the 2025A will easily withstand a harsh mobile environment.
The back panel includes a jack for an external speaker (an d once you have tried this you will never settle for a built-in speaker again), antenna and power con- nectors plus an accessory con- nector that includes micro- phone input, audio output, transmit-receive switching, and connection to the IS-volt dc power supply.
Moving back inside, I noticed that all of the frequency genera- tion and most of the audio cir- cuitry was centered around in* teg rated components. The rf section stUI utilizes a fair number of discrete semiconduc- tors, but the chip-based technology is rapidly closing the gap.
Plus and Minus Points
With a growing trend towards higher power for two-meter transceivers, the 2025A holds It own with a choice of two power levels, either one of which can be set between 3 and 25 Watts. If you need still more power, then consider an amplifier; you also get the added advantage of a receiver preamplifier that way. Unlike most of the other new FM rigs appearing on the market, KDK retains the traditional d'Ar- sonval meter movement for the power-oot and signal-strength measuring chores. I can't knock the newfangled LED bar displays without trying them, but I do know that the old- fashioned meter makes the radio look more "professional."
Among the bells and whistles that you won't find on the 2025A is a priority channel. Nor is there a provision for up/down scan- ning via switches on the micro- phone. For me, the Jack of these features had no effect on my operating style.
Perhaps the biggest draw- back of this easy-to-use radio is the close proximity of the vol- ume/squelch, mode, and memo- ry-select knobs. They are alf the same size and easily confused if you don't glance down at the rig.
On an overall basis, I give the FM-2025A high marks. It represents a substantial step forward In ease of operation.
While it doesn't resemble the mission-control- panel look prevalent on a lot of new ngs, it Is a sophisticated, fealure-laden radio. It should be especially popular with amateurs who want a radio they can tmker with. The 2Q25A certainly proves that KDK is more than just the '*other guys" when it comes to building radios.
\n (ate t98i. the FM'2025A was priced at $299. For more in- formation, contact KDK Distributing Co., 617 South Gaffatin Road, Madison IN 37115, Reader service number 476.
Tim Daniel NBRK 73 Magazine Staff
OFD SYSTEMS
RT-89 RTTY SYSTEM
The DFD Systems RT'89 package Is a dfsk-based RTTY system for Heath/Zenith H89 and H8/H19 computer systems. It runs under the Heath Disk Operating System (HDOS), pro- viding unmatched features and tiejcibility for the serious RTTY enthusiast. The system is designed to operate on a single- drive, 48K machine with plenty of space (eft over for disk read/write files and memory buf- fer space. All input/output operations are buffered and interrupt driven, allowing true full duplex (send-whlle-receive) Operation and real-time disk file read/write capablftties without loss of data.
There are 66 commands im- plemented to configure the system and control program op- eration. In addition, a special file. "RTTYINIT.TTY", is auto- matically read at program start- up time to establish the mttial system environment. This frte can be indrvidually tailored by the user to automatically boot the system in any desired con- figuration.
RT'89 will operate at speeds of 60, 66, 75, and 100 wpm in the Baudot mode^ or at any stan- dard ASCII baud rate from 110 to 19,200, Automatic synchronous idle (diddle) may be selected at any of these speeds in either mode^ and an automatic down^ shift-on*spaG©(DSOS) feature is selectable in the Baudot mode, Af[ CW identification Is automatic, including an ID at nine-minute intervals during any single transmission. This feature can be disabled with a keyboard command if desired.
In addition, a CW ID shift control and transmitter on/off control are available from the computer-
An automatic drsk log is main* tained each time the transmitter ^s keyed, and mar^ual entries may also be Inserted on the log at any time with the N= com- mand. The time of day is automatically recorded with each log entry, so the system log can also be used as the sta- tion log if desiredS
System tine width can be varied from 20 to 80 characters since the H89/H19 terminaf has a full 80x25 line display. The screen is split into four func- tional areas; a receive window, a transmit and command window^ a split-screen and statusdis- play bar^ and a "times square*' moving-marquee format on the 25th line that displays the transmitted data as it is actually transmitted. This latter feature is useful when the transmit buf* fer has been preloaded or a disk file is being transmitted, since the transmit window displayed the buffer contents as the trans* mit buffer was loaded, and the 25th line actually displays the buffer data as It is being sent. Therefore, the operator always '*sees" what is t>eing transmit- ted over the air at any given time. The sizes of the receive and transmitycommand win* dows are dynamically variable and may be changed at any time during system operation, In fact, any commands may be issued at any time (except during transmit), so there is never a need to stop the program to re- set any parameters as there is on some other systems.
The system may be directed to ignore carriage returns in the receive window, thus "packing" a maximum amount of data on the screen. The carriage returns are not ignored, however, on the printer or disk files, so the actoal format of the received data rs not lost (you can write on the printer, read and write on disk, and receive and transmit all at once, in real time, due to the interrupt-driven I/O structure).
Any number of tiles can be written to or read from disk at any time, and the printer may be turned on and off at will, in- dependently for received and transmitted data!
A variable-length **word- correction buffer" is provided to allow correcting of keyed Input data prior to its release to the system. The length of this buffer
may be set from 1 to 80 charac- ters, and facilitates backspac- ing over entry errors and correct* Ing them before transmission. There are actually two cursors displayed on the screen: a flashing underline cursor which indicates where the word cor- rection buffer starts, and a destructive block cursor in- dicating the next location that will be occupied by keyed Input. In addition, the system can be directed to automatically **wrap around ' when the end of a line is reached and no carriage return is keyed. In this event, the system will automatically move the last word keyed to the next line. If it is incomplete, and Issue the carriage return itself.
An unusual and very en- joyable feature provides the ability to process RTTY pictures. The system may be placed in the PIX mode, and overlining will be allowed on input and output files and the printer. In addition, three off-line programs are In- cluded with the package that will allow one to edit PIX files with the standard HDOS text editor, and automatically com- press and expand those FIX flies to conserve disk space. PIX files received over the air are ac- tually compressed before they are written to disk, and com- pressed PIX files on disk that are read for transmission are automatically expanded by the system at transmit tfme!
In addition to the unlimited disk file capability, there are three temporary single-line buf- fers that can be loaded and read out using the three colored func- tion keys on the H89/H19 keyboard. These are handy for holding cails of current stations in QSO or repetitive contest in- formation. Other function keys can be used to rnsert the current date and/or time in the transmit buffer. (The time of day is also always maintained on the split- screen bar.)
In operation, the TX or TXF commands will put the system in transmit mode, and a CONTROLC will terminate the transmit mode. Data can be entered into the transmit buffer while in receive mode, and that data will be transmitted the next time TX (transmit) mode Is entered. TXF (transmit fast), on the other hand, will not send the data in tl^e transmit buffer, but will only send data keyed from the keyljoard. TXF, therefore, is used to answer a quick question
73
or to send a quick message without sending the data In the transmit buffer. After TXF, more data can be entered Into the transmit buffer, if desired.
Disk-based commands in- clude opening and cfosing disk tiles for either read or write, displaying directories^ deleting files, exchanging files, and swapping disks in drives 1 and 2.
Performance
The RT-BS system has per- formed very well for more than a year of operation on both the HF and VHF bands. The system was designed to support Navy MARS message traffic as well as amateur traffic, and has now replaced all mechanical teletype equipment at Navy MARS stations NNN0AFL and NNNOZVW. No system prob- lems or failures have yet been encountered at either station.
The system includes com- plete operational documenta* tron and directions for inierfac- ing the computer to a terminal unit. The system has been suc- cessfully interfaced with a HAL ST-B, commercial and home- brew Flesher TU'170s» and the IRbSOO. The iRL-500 interface was the easiest to accomplish since it already had inputs and outputs to directly interface to the computer at RS-232 voltage levels.
Each RT-89 system is per- sonally generated for each pur- chaser to include the station callsign. This callsign is per- manently displayed on the split- screen bar during system opera- tion and is used In generating the CW identification. Minimum hardware requirements are an HStwith an H19 terminal) or HS9 computer, a single disk drive, and 48K memory. HDOS is also required to operate the system. The package consists of the pro- grams on a 5V4" diskette and an instruction manual. The cost Is S39.95, For further information,
contact DFD Systems, 4W5 N.
107th Street, Omaha NE 68134. Reader Service number 477.
Dick Jugel K9DG 8014 Taylor Circle
Omaha NE
INTERFERENCE HANDBOOK
Whether the alphabet-soup nomenclature Is TVI, RFI, or EMI, interference is a constant threat to the radio amateur, lurk- ing in the shadows, waiting to
Magazine • February, 1982 119
turn docile neighbors into a horde of angry enemies. Even though tue war against interfer ence has just tegun, there is hope tor the ham-radio army- Radio Publications' new book. Interference Handbook, is des- tined to become a biUe for the tactlcs-mmded foot soldier. The author of interference Hand- book knows what he is talking about; William Nel&on WA6FQG is the veteran of sixteen years of trench warfare as an RFI in- vestigator for Southern Califor- nia Edison Company.
RFi has plagued us ever since Marconi made his first transmis- sions nearly a century ago. While moderfi'day legislators and manufacturers grapple over
a long-term sofutfon, the prob- lem gets worse and the poor radio amateur is caught in the middle. The approach that fn- terference Handbook takes is best summarized by the quote: 'The purpose of this handbook is to Dutime the many sources of Interference; explain how to eliminate or reduce them; and tell you how to protect yourself against RFI. The causes and cures of RFI are discussed in nontechnical language that Is easy to read and understand."
The topics discussed range from interference caused by home appliances and the RFI emitted by power lines to the misunderstood role that hams and CBers play in causing and
solving Interference problems. Along the way. the author gives case histories based on his years as an investigator.
Tips for locating interference with inexpensive gear are ac- companied by descriptions of commercial and homemade cures. The contents will be ot in- terest to anyone who deals with electronics. This could include the members of a radio club In^ terference committee or a music lover who is plagued with auto- mobile ignition noise. The t>ook is rounded out with a listing of addresses for gaining help from manufacturers.
Interference can work t)cth ways as evidenced by recent ex- periences at the 73 Magazine
ham shack; Several months ago, a pulsating noise of unknown origin kept us bewildered (and off the air) for several weeks. More recent ly» a neighbor has complamed abouX TVI that may be the result of our station. In both of these cases, a volume like the 247-page Interference Handbook would have helped to reduce the mystery and ag- gravation for everyone involved. A paperback edition of In- terference Handbook is available from the publisher^ Radio Publications, Box J49, Wifton CT 06397, or 73's Radio Bookshof}, Peterborough NH 03455.
Tim Daniel N8RK 73 Magazine Staff
LETTERS
[
QRZ CONTEST?
The weekend is here, I canl wait to get my cup of coffee, go downstairs and turn on the rig, and relax with some CW. Cranked up the old workhorse, my TR4'C, switched on the keyer. I love CW. my phase of en- joying ham radio, and spend most of the time on 20 meters and a little on 40 meters.
Here comes the audio, and what? Not again! The entire band loaded! Another contest? I thought they just finished one; you know how time flies, t must admit I have l^een in only one con lest, in the early 60s, and cannot rememt>er what it was for, but learned it was not for me. There are no redeeming fac- tors in them that I can see. A field day or emergency prepar- edness operation so as to be able to get a station on the air fast in almost any location, por- tabie, of course, to assist those in need of help, I am all for with- out exception, but to sit for 1 2 or 24 hours at a key or a micro- phone cau^ng a traffic jam worse than the California free- ways ever saw is a gross waste of time and energy.
I enjoy a good rag chew— or at least to find out more than a QTH and a name that's in the Ca//i)0O/r— talking over your ex* perienceSt experiments, good or
bad. is a greater way to enjoy one*s on-air time.
Let's think about it; contest weekend as it appears to me seems to relate itself to the opening of hunting season, the night before everyone partici- pating making final prepara- tions, checking their '*guns" for the big day. From cannons to peashooters they are all ready. The clock is ticking away the last few minutes before the ac- tion begins. The beams are poised at each other, power sup- plies humming away, fingers be- gin twitching, one ready to send, one ready to record the contacts, then bang! A solid wail of rf rips through the ether and for the next day the battle for t he climb to the top rages on. Stepping on each other, over, under, and around. When Ihe period of time for the contest is over and the electromagnetic radiations clear, the battlefiled can be seen strewn with broken and mangled coffee cups, smok- ing ballpoint pens, splinters of pencils, and scraps ot paper. The casualties are entering the ''hospitals'' with keyer finger, tennis wrist, another fomn of keyer finger, and ear-ring: a new one, being a depression in a cir- cular fashion around both ears, manifested by a constant series of tone bursts that won't subside.
Why so many contests?
ArenM there enough awards to be gotten on one's own without the additional promotion of con- test after contest? I wouid like someone to reply and let me know.
Mow don't get me wrong. I have gotten a few of those symptoms myself. What I am trying lo say is those who prefer contests are good hams, they enjoy their phase of ham radio, a great hobby filled with very nice people. But all 1 ask for us m the apparent minority is that on those special weekends, those who sanction such contests tfiink, think of the other hams who are not participating and leave at least 10 or 15 kHz aside for those of us who would like to just get on and relax with a good QSO, be it CW or SSB.
Why should the bands be to* tally monopolized during these periods? A toi of us just do not have the time to spend on the bands and really look forward to our weekend operation.
Gary L. Jackson N2ACX
Delron NJ
N2ACX UR 599 Nh DE WB8BTH BK.
THANK YOU, ERIC
Zl
As a subscriber, I feel it is my
duty to inform you of the good job you are doing. I am a new subscriber to your magazine and I love it I I am 13 years old and a General class ham. My fa- ther is also a ham and he likes your magazine, too. Between my father and I we receive GST. Ham Radio, CO. 73, and CVRA-
SERA Journal We enjoy your magazine the best. The $25 is well worth it. I find many inter- estlng articles In your magazine. In QST, Ham Radio, and CO f rarely find a really good article. Many times the advertisements are the best things in QST\ I can't say QST Is a bad maga- zine— it has many important ref- erences. The other magazine (journal), CVRASERA Journal, is a great magazine. I find it and 73 the most interesting.
Thank you for your time, I just wanted to tell you how great your magazine fs. Keep up the good workl
Eric Lasslter KA4KEG Danville VA
WIN SOME. LOSE SOM
El
The last of the ham radio pubtrshers bit the dust! I never
thought you would pass us off for the quack electronics, but my new Decemt>er issue with satellite TV, computer scanners, and all really opened the oid eyes. I think Til go back to model trains. I get enough of the elec- tronic garbage at work all day. NO renewal for me next spring.
Ed Chenoweth K4HYG Zephyrtiills FL
Sorry to fose you, Ed. but we do have to bang news of what is happening in electronics to those amateurs who are helping
the hobby to grow, . . who are in- terested m things beyond spark gaps, t realtze that not all hams are going to be inventing and pioneering new techniques, bat
120 73Magaiine • February, t982
/ had hoped that those who are more interested in takmg a free ride on the shoulders of those who are doing the work would at feast be honorable enough to read about It and cheer them on instead of frying to shoot them down.^Wayne,
Seldom do I write to the editor of a magazine, but every once in a WfhIJe something will catch my eye. Such was the case when you asked in the October 73 Magazine what we could do to spur the growth of ham radio.
Let me state that I am flatly opposed to no-code licenses. We already have them m the form of citizens band commun- ications (I use the word "com- munications" with some res- ervation in this case), and I for one don1 want 15-meter phone sounding Hke that. J really can't imagine that you do efther. Now to the basic question: What can we do?
1. We can exert pressure on the Federal Commuoicallons Commissfon through our elect- ed representatives to take the tricks out of amateur exams. For exampfe, a friend recently took (and passed) the Extra class ex^ amination in Boston. Part of his code proficiency test m- volved the apparent word "Sprfngfieid," but on the tape II was sent '^Cprlngfield," Grant* ed, this qufckie will determine If the examinee Is paying abso- lute attention, but does it prove anything else? Is this the type of thing one would encoun- ter in a normal QSO (which the tape is supposed to emulate)? f think not.
Z We can stop regarding our- selves as an elitist group. While my previous reference to citi- zens band could be construed as elitist— and perhaps It Is— we must recognize that our hob- by is no better than that of any^ one else. If a CBef wants to be a CBer, then so be it. If an audio- ph//e gets enjoyment from his "things' then (et him. We should not continue with the attitude that everyone in electronics either should ^'progress" inlo the ham fraternity or be rele- gated to second class. Perhaps if we are less pushy more people would want to join us.
3. Along the same lines, we should make more of an effort to help the newcomer. We spend a
lot of time and effort getting people into ham radio through Novice classes, but how many Novices have given up on our hobby because the Techs, Gen- erals, Adva needs, and Extras were too busy with their own in^ terests to give a hand after the newcomer got that much-antici- pated ticket? If youVe not really sure of what youVe doing and there's no one to help, amateur radio can be pretty confusing. Take the time to help a Novice; you may be saving tomorrow's Extra class licensee,
4. Again, along the elitist line, we need to have more of those 'in the know" willing to make what they know readily avails able. It does not seem consis- tent to this writer that an editor of a widely-read ham publica^ tion could advocate the spread of our hobby on the one hand and then ask $1,000 or more tor a speaking engagement at a hamfest on the other. Granted, Dayton and Birmingham can probably afford this tariff, but Windsor (our local hamfest) can't, and Windsor is more likely to touch a greater number of new and prospective hams in central Maine than are Dayton and Birmingham combined. Please don't take this as a per* sonal attack, Wayne, but you did ask for constructive ideas.
5. We need more affordable equipment designed for begin- ning amateurs. Unfortunately, our hobby is pricing itself out of the reach of many would-be joiners because they can't af- ford a Kenwood TS-530, an loom 720A, or an Astro T50. What we need are more Ten-Tec Century 21s thai lei the little guy get his feet wet with new (a Novice doesn't need the problems which often come with used gear), reasonably priced, and ef- fective equipment.
6. Finally — for now, at least— we need effective repre- sentation in the FCC. Some government commissions are required to reflect in their mem- bership the interests of those that ihey regulate. Why not a ham as a required commission- er, and a CBer, too? Who knows better what we want than one of our own? Certarnfy not some politician from the "in" party who had the misfortune of los- ing in the last election.
and different fdeas. I wouldn't even object if theirs were better.
BiflCrowtey K1NIT Ha Howell ME
No offense. Biff; the $1,000 goes for a special fund for promoting amateur radio, not into the gen- eral coffers. Without that limita- tion rve found that i am getting dozens of invitations to taik. few of which would be possitle for me. Thus, this is a fil- ter, . . and also a benefit for am- ateur radio. You're right about the tricky exams, . . there is no excuse for them. There wilt be cheaper ham gear for beginners when we have enough begin- ners to make it profitable to make the stuff. Remember that plenty of equipment has been put on the market in the past, but it has not been continued due to an almost total lack of newcomers. And took what hap^ pened to the newcomer maga- iine. Ham Horizons]- Wayne
THE HEATH SNOOZE
' have just finished the con- version of my Heathkit clock as stated in the November issue of 73 h4agazine ("Extra Accuracy for Heathkit Clocks," page 124). There were no conversion or cross-reference fists at any of the local Radio Shack stores for a switch with part number 275- 430. f could have used another RS switch, but keeping with amateur radio practice I quickly realized that the Alarm Set Switch (SW3) could be used and the oid Snooze Alarm Switch (SW2) wired in Its place. It Is a (it- tie cumbersome to use fn set- ting the alarm, but then I don't use this function. My clock works as stated in the article.
The wiring is done in the same manner as Art N5AEN stated, and the new SW3 is wired as shown in the clock manual
Others may be Interested in this miser's scheme to beat down the rising cost of ham radio.
rve enjoyed 73 hAagazine and will continue to do so.
Jack Gamar KB7HH Phoenfx AZ
cjally interested In the radar devices you use and test. My mobile friends tell me the de- vices are not very good any- more. The policeman with the gun pops It on and gets a read- ing and you are hooked. No more carrier to seek out. I don't travel much anymore, but I do have a new approach to traffic tickets.
I propose a tape-deck player and a speciaJfy^prepared deck that starts with fifteen seconds of sofi music. an<^ men a con- vincing commercial announcer who breaks in with the news that the USA is being attacked by USSR missiles and the Presi- dent is on his way by helicopter to the Virginia underground shelter. . .all citizens are to go to any nearby shelter. News flashes give reports of missiles twenty minutes from Chicago, Detroit, Washington,,,
I think by this time the trooper IS on his way and you are free to go to your destination.
Just don't get stopped by the same guy the second tima
£d Kirchhuber K4JK Elkmont AL
Fiendish. .J like iff The radar gun? I've only run into one once in New Hampshire so far, so it isn*t much of a problem here, fn that case, / got plenty of warn- ing before I even got close due to the sensitivity of the superhet detector and was safely not transmitting on two meters when I went through the check point. Your detector should pick it up a half-mile to a mile away and give you plenty of warning to stop transmitting so you won t rack up a speeding ticket even when you are moseymg atong at 55 per. The officer gen- eratfy takes a shot at a car ahead of you and you pick up that blast. This also gives you a chance to check your speed, which averages around 70 mph on most of our interstates.— Wayne,
Well, Wayne, there you have it. I hope this letter will prompt others to put on their thinking caps and come up with more
When 1 read QST, j first look at the silent keys. With your 73, I read the editorial I was espe-
Those of you who have been around ham radio for more than a few years undoubtedly remem- ber Gus Browning's fabulous OXpedittons of the 50s and early 60s. Welt, W4BPD is back at it again and will be sending us monthly reports on the progress of his current round-the-world trip. Welcome aboard 73, Gus!
73 Magazine • February, 1982 121
This ifttle episode is being written while we are at anchor down in Florida awaiting a few minor repairs to be completed on the boat, but by the time you read H we will be somewhere in the Caribbean. We have named the ship DX since DX is what it's all about with us. Our mail ad- dress from now until this trip is completed is just "DX, 29039. USA/'
A friend of mine talked with me up at DXPO 80 last Septem- ber and asked mo the question, '*Have you ever thought about another DXpedition, Gus?'*
You know what my answer was (''I have the time if you have the money"), and he said that money was no problem! It ended up that a boat was purchased and the old rat race of getting it shipshape for a real DXpedition began. The resutt is that here we are about to take off for the com- /j/e/e Caribbean tour; we'll goto every country down there that we can get permission to oper- ate from. (They tell me that 11- censing is no problem at almost every one of them.)
This feller Wayne Green must have lots of pull somewhere be- cause both on our way from An- napolis to Beaufort, South Carolina, and then again from Beaufort down here, I saw a sign on the Inland Waterway on the left side each time with the num- bers 73 on a green background. And this Wayne Green don't fool around, neither, because when I mentioned writing a series of letters for 73 Magazine, he said, '^Don't stand there, start writing." So here I am doing just that.
This DXpedition should be considerably different from the others I have been on. This Is planned to be an island-hoppmg DXpedition with inland excur- sions when it's possible and worthwhile from a DX viewpoint. We will be going by the seat of our pants all the way. This DX- pedition by boat sure will be a lot better than the other ways I have used before, and it sure will be lots cheaper to charter a ship than to spend anywhere from $100 on up per day the way I've done it many times before. Since 99% of our traveling will be sailing, using the wind for power, it will be very interesting to see how our overall expenses compare with those of trips when other means of transpor- tation were used.
The purpose of the first por-
tion of this trip will be twofold: We will be shaking down the boat and we will be trying to see how we get along with each other being cooped up over long periods of time in a small space. There are three of us— myself, my XYL, Peggy, and Sam, a WA3 from the Washington DC area who purchased the boat. So far we are quite compatible, though at times a little touchy with each other, which we all expected before we ever got started.
Our tentative plans are to cover the Caribbean, probably taking until the next hurricane season, which starts next June. Then we will sail back to Beau- fort to have the boat gone over with a fine-tooth comb and to visit all the grandchildren, the kids, and our friends. We'll restock the boat's larder, tight- en up all the bolts and nuts, and then take off for the Pana- ma Canal, the big, wide Pa- cific, and all those countries out there waiting for us to Dxpedite. If things are still "go," then we will continue on around the world, hitting as many spots as we can along our line of travel. We won't mind deviating from this line of travel a few hundred miles when, from a DX view- point, it looks like that's what we should do.
The very first thing we all agreed upon was that we wanted this trip to be a safe one. Since we have no set date to be anywhere along our route, we can always wait for the weather to get right before we depart from spot A to go to spot B. If all three of us like a certain place and want to spend a few more days or even weeks there, we willdojustthat.Thiswill more or less be a leisure trip with DXpe- ditioning a first priority on our list. Right now, we are at the creeping stage; we hope to be at the walking stage when I write the next installment, and at the running stage from there on out.
We have a very good ship, an O'Day 37 (measuring 37 feet long and 11 feet across). How would you like to make some- thing like this your complete home for up to five years? It will be on the rough side, but we will be in there trying our best to stick it out. Our ship is fully equipped with all the very latest gear We have a satellite naviga- tor that does a better job of pin- pointing our position than most maps, We have a good radio
direction finder^ a good VHF transceiver, and, of course, a sextantp which I have practiced on for months. I still need more practice to get good on It. We have a huge pile of maps and charts but will need many more when we get to the Pacific and other oceans on our way around the world.
We will be taking it easy along the way and hamming as much as possible. We plan to use both CW and SSB on equal terms, go- ing by the apparent needs of the fellows. We have the full Ten- Tec line of gear, their Omni-C, Hercules linear, electronic key- er, and antenna tuner for the long wires we may put up for the low bands. I cannot get over the Ten-Tec's fast break-in, the no tuning when you change bands, and the almost silent receiver when you disconnect the anten- na. As a back-up, we have Ten- Tec's Delta. Our antenna is a TET and it will get a real test of endurance on this trip. As you can see, we're delighted with the equipment we have.
QSLs will go out three dif^ ferent ways. When we have time after the trip, every QSO in the logs will go out via bureaus. The second way of QSLing will be direct to those who send their cards to out "DX 29039 USA" headquarters and contribute $1.00 to help us defray the cost of QSLs, postage, and Girl Fri- day making them out. The third method will be direct from the spot where we work you or, if necessary, from the next spot we operate, to those making a $2.00 contribution to help us with expenses. (We do not ex- pect to come anywhere near breaking even on our expenses.)
I don't think we can help any^ one with 300 or more countries, but we might be able to help you if you have 200 or so. Maybe we will help some of you on 40, 80. or 160 meters. Later on we may use other means and ways of
communications. We are* of course, open to your sugges- tions. We may or may not follow them, but '1ry us"— hi.
On CW, look for us 25 kHz from the low end, except on 160, 80, and maybe even 40. On SSB, when we are not under FCC rules, we will try using more or less these frequencies: 28490, 21190, 14105, 7090, 3790 kHz; and on 160— who knows, hi- But once we settle down on the ir^ quencles we want to use, these will be where we will always be founds plus or minus QRM. I can promise you I wiil never get mad at anyone on the entire trip. A real nuisance to us may have a difficult job getting our OSL for his contact— the last laugh will be us doing the laughing, hi.
Up to now, there has been very little contributing or donat- ing by anyone, so I am under obligation to just a few and I know who they are. I don't mind tail-enders or any other way you can come up with to get your call in my log, I try to work the weak ones first, so if you are QRO please go QRP if you want to work us first, hi. At times we will QSY into the Novice bands and will usually be tuning in the parts of the band Generals can use. But you had better have wide shift-split capabilities, or you may miss us. Occasionally, we will use transceive, but don't depend on this mode for many contacts with us. I say get your- self an outboard vfo and join in with the real DXers.
There will not be any of this list type of stuff on this DXpedi- tion—if you want to QSO, get in there and work me. I don't want any of this stuff: "Gus^ so and so said you are Q5-S7"; I want to hear that report and call myself without any assistance from helpers on the sidelines.
That's it for this episode, fellows— 73 de Gus 8PD.
Gus Browning W4BPD
MM HELP
I am fn need of technlcaf Infor- mation for the RCA AR88D re- ceiver. I am also looking for a 24-hour brass ship's clock.
Mickey McOaniel W6FGE
940 Tempie St.
San Diego CA 92106
I am searching for informa- tion on the use of electric limit switches with a Tnasto TX-455 crank-up tower.
Don Greenwood KC8GZ 2687 Timothy Place
Wooster OH 44691
122 73Magaifn& • February, 1982
FUN!
John Edwards Kf2U 78-56 Beth Street GfendafeNY 11385
HAMS AND COMPUTERS
Shh! Keep this quiet! Don't tell anyone, but I think microcom- puters are taking over amateur radio.
Take last Friday, for instance- I'm working this station on CW— AF2M, I think the call was— and he's telling me about his rig, the weather, and all those other things that make QSOs so in- teresting. Then, alJ of a sudden, something must have blown in his shack because he just keeps sending "599, 599, 599. . ."After about 10 minutes of having my signal verif ied^ it dawns on me— AF2M is a machine! Egad! This is worse than CB. At ieast on the chicken band you pick up animals, not androids.
it's scary. So scary, in fact, that I decided to write a column about ham radio and microcomputers. Hme it Is but don't tell anyone. I hate to be an alarmist. Where the heck did 1 put my nightlight?
ELEMENT 1— CROSSWORD PUZZLE (lllustratian 1)
Across
1 Letters and numerals
8 Below high frequency (abbr.)
9 Direct memory access (abbr)
10 Computer lingo 13 Package type (abbr.) 15 Operating position 18 line
19 Former big-time computer manufacturer {abbr.)
20 Program that revises (2 words)
22 And off
23 Data processing (abbr.) 25 Bulletin board (abbr.)
27 Semiconductor type (abbr.) 29GOSUB
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5 Statement of condition
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7 User
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12 Golly
14 Instruction
16 To follow immediately
17 Bright diodes (abbr.) 21 Memory type (abbr.) 24 Cycles in a second
26 Smallest computer unit 28 fj
ELEMENT 2-MULTIPLE CHOICE
1) Computers can exchange information by using a code known as ASCII. What does this acronym stand for?
1. American Standard Code for interchanging
Information
2. American Standard Code for Information
Interchange
3. American Standard Code for Interconnecting
Information
4. American Standard Code II
2) Who was Herman Hollerith?
1. Father of the punch card
2. Father of punched paper tape 3.! Inventor of the floppy disk
4. Inventor of the CRT
3) What are "Napier'^ Bones"?
1. The remains of August Napier, inventor of the
first analog computer
2. The first pocket calculator, named for the
device'3 ivory color
3. A figment of the imagination
4 Ivory rods which, when placed next to each other, can be used for multiplication calciiiations
4) An "automaton" is:
1. A mechanism under the constant control of its
own resident intelligence
2. A mechanism under the constant control of a
human or other external inteliigence
3. A mechanism under the constant control of a
programming routine previousiy supplied by an external inteliigence
4. A waste of time
5) How many laws of robotics did Isaac Asimov detail in his book I Robots
1. One 2. Two 3. Three 4. Four
ELEMENT 3— TRUE-FALSE
True
False
Illustration 1.
1) HAL, the computer in 2001: A Space Odyssey, was built at the Hal Plant in Urbana, Illinois, on January 12, 1997.
2) Speaking of HAL, his name stood for Heuristically-pfogrammed ALgorith- mic computer,
3) The word ^' robot" was coined by Czechoslovakian author Karel Capek in his play R.U.R.
4) An early electronic computer, ENtAC (1946), contained 19,000 vacuum tubes.
5) After ENIAC, there was a computer caiied MANIAC.
6) PASCAL, the computer language, was named after Blaise Pascal, a 17th century French philosopher.
7) The ' Computerlst's Code" states that a computer user should never use his equipment to harm anyone.
73 Magazine
February, 1982 123
8) BASIC is a high-level language.
9) Bubble memory uses microscopic magnetic bubbles,
10) CPU stands for "Control Program- ming Unit,"
READER'S CORNER
Do you have a ham-related puzzle you would like to share with FUN'S readers? Then send it in for a chance to see your name in print. This month's contribution is by Joe Strolin K1 REC, of Norwalk, Connecticut.
ELEMENT 4— HIDDEN WORDS (Illustration 2)
Hidden in this puzzle are words representing 15 different com- puter terms. The words are formed In any direction— horizontally, vertically, or diagonally, forwards or backwards. As you find each wordj circle it.
MAGtC SQUARE (Illustration 3)
Circle any number, then cross out all numbers In the same row and column. Do this until only one number is left, to get the message.
Send in your answers. We'll print the name and call of everyone who solved the puzzle.
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lilustration 3.
Iliustration 2.
THE ANSWERS
Element 1: See Illustration 1A. Biement 2: 1)— 2, And you know what great stuff American Standard makes. 2)— 1. Ever noticed how these cards are only a little larger than a dollar bill? That's because HH used the dollar bill of his time {1890} as the template for his card. He invented the card and its reader for use in the US census. 3>— 4- Scottish inventor John Napier (1550-1617} developed this precursor to the slide rule.
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ALP |
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N U Mi |
ERIC |
|
pMl |
fH |
aHo |
■ eMo |
|
rIa^H |
sId |
M aIm |
|
|
LAN |
G U |
A GiE |
O^^T 0 rHr |
|
1 P^Ia^HeH |
|||
|
0 0 n1 |
S 0 |
L EH eIM |
|
|
aWe |
^H |
||
|
TEX |
tT |
D 1 T |
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Illustration 1A. 124 73Maga2ine • February, 1982
R P
N O
W R E H (y R A N I
B
P O
U
E N A T H R
T I A S
d) R
L U M N D 1
T L V A
E S
A/t) D R [ E 1 S S) K
E E
DON
1)A R R
E A
T
R A H C W O
^
ilfustration 2A.
4)— 3. 1 is an android, 2 is a robots and 4 is what noting tiie dif- ferences iS. S>— 3, And if you break one of the three, you 11 gel a robot fine. Element 3:
1)— True Long way from the ST-5000, Dr. Chandra.
2)— True Try saying that 10 times, fast.
3(— True Rossum's Universal Robots,
4)— False Ha-ha; sHghtly under IS.CXX).
5)— True Engineers just love snappy acronyms.
6)"True Blaise Pascal (1623-1662), who, after a day of philoso-
phi?fngp would tinker with his adding machine. 7)— False The computerisrs what? 8)— True Afso the most popular, as if you didn't (tnow. 9) — True And if you took through a microscope^ yoLt can even
see them move. 10}— False Central Processing Unit Efement 4: See lltustratton 2A.
SCORING
Element 1:
Twenty-five points for the completed puzzle, or Vi point for each
question correctly answered.
Eiement 2:
Five points for each correct answer.
Element 3:
Two and 1/2 points for each correct answer.
Eiement 4:
Two points for each word found.
Are you digitally inclined?
1-20 points— Still mad at the government for outlawing
spark. points — Thinks computers might have a future, points— Likes to play with display computers in
stores. points- Owns a nice, sensible computer system, points— Home-brews own computer.
21^-40 41-60
61-80 81-100 +
/IIVARDS
Biil Gosn&y KE7C Micro-80, Inc. 2665 North Busby Road Oak Harbor WA 98277
WAT AWARD
The Cabin Fever Radio Club of Tok, Alaska, offers a cer- tificate for contacting three amateurs in Tok. There are no band or mode restrictions. However, all contacts must be made after December 15, 1980, to be considered valid.
To apply, prepare a list of con- tacts in order by callsign. In- clude the name of the station operator, the date and time worked in GMT, and the mode and band of operation. OSLs not required. Amateurs located in Tok include AL70, AL7B0, AL7BV. and WL7APG.
Send your application with $2.00 or 10 IRCs to: Cabin Fever Radio Cfub. Box 451, Tok AK 99780.
WORKED ALL FORGOTTONtA
Announcing the awards pro- gram sponsored by LEARC, the Lamoine Emergency Amateur Radio Cfub of Macomb, Illinois. The Worked Forgotten la award is issued amateurs who confirm contact with three (3) licensed amateurs of Forgottonia. The Worked ALL Forgottonia is awarded operators confirming contact with at least one amateur in each of the sixteen counties of Forgottonfa.
What is Forgottonia? It is the 51st state! It consists of the tollowing counties, formerly
W
a^mimmA^oK
'dBS€0'
wesi central Illinois: Adams, Brown, Calhoun, Cass, Fulton, Greene, Hancock, Henderson, Knox, McDonough, Mercer, Morgan, Pike, Schuyler, Scott, and Warren counties.
All contacts must be made after June 28, 1980. to be valid. From the letter we received from the club, the award evidently is Issued at no charge since no remittance was mentioned- For- ward your list of verified contacts and a 9" x 12" SASE to the attention, of AG9Y, c/o
LEARC, l224MapleAvenuepMa' comb IL 61455.
JUNIATA VALLEY
In March, the Juniata Valley Amateur Radio Club (JVARC> will be celebrating its 25th year as a bona fide club. In honor of the event, they will be operating a special event station. The club station Is K3DNA, located in Lewistown PA {Mjfflfn county). Having started operation fn January, %hQ\T heavy operation is scheduled for the month of
^ <
THiS CiBrffWAfB fS AWARDED tN RfCOGmnON Of SUPfmR DPfBAfm Smi Am NQ8LE DiD/CATm TO TmmH£ST PmCfPUS OfAmnUH ffADIO.
me REcmmr has QEmmiRATm these AimBms by MAms rm wav MDfo
COmACT WiTH A UCEmEQ AMATim W EACH Of THE SIXT^N COUNTIES Of
^BGOTTQMA, "^*
//
<?^
OPE/tATOff
£^€
WAHftiH
JJAjM
STATION ^D? X y^L
^ #n>HiJHi1
\
fOHGOTTOmA ^ THE Stsr STATE Of T^ iMM&i. matm Y WEST C&fTfmL MmOfS
tr WAS fomoED m 1373 wheh the naif Mtam ftESiOfNTS Of THE AREA /minm
rmr wEfiE ommG mAt^i r mFA^ABtE ffOAOS. SEHtom wbr ammm to tmoEfi
ftmED scMtrng Am sEm monEO or Mi iimois officms emceft rm
DEPAffTMmtT iff jRfl^iftM,
73 Magazine • February, 1982 125
March. The station will operate on different bands, CW and phone, according to the opera- tors' wishes. One contact with any club member wiff efititle the operator to receive the club cer- tlficate.
VK1 ACHIEVEMENT AWARD
The A,CT. Divrslorr of the Wireless Institute of Australia is proud to announce the creation of its newest award, the VK1 Achievement Award. This award has the arm of increasing in^ terest in the VK1 prefix and in promoting Canberra and Austra- lia Internationally.
As there are only 300 VK1 licensees, the award will not be an easy one to achieve, par- ticularty on some bands and modes.
The VK1 Award fs available to licensed amateurs throughout the world. To qualify, stations within Australia must work 20 stations in VKt land on HF and on VHF. Stations outside Aus- tralia must work a minimum of 10 VK1 stations for the HF seg* ment of the award.
To apply, submit your list of contacts,, includmg the GMT time and date worked, the band
and mode of operation, and any reports or ciphers exchanged.
To be valid, all contacts must be made on or after January 1, 1978- Endorsements may be given at the time appltcalion is made. Five IRCs or S2.00 fn Australian currency covers the cost of the award and should be sent to the Award Manager, c/o WIA. PO Box 46. Canberra A,C.T- 2600, Australia.
By the way, the VK1 Award is also made available to short- wave listening stations on a heard basjs. QSL confirmation is required*
SNOWFLAKE MADNESS
The Michigan Technological University Amateur Radio Club and the Copper Country Radio Amateur Associatbn announce a radio celebration of our Winter CarnivaJ festivities in the nor- thernmost part of Michigan's Upper Peninsula.
Tech's Wrnter Carnival is probably the most spectacular winter festival in America, with fantastic snow sculptures, dogsled races, lots of skiing, and other festive events.
In association with the Cop^ per Country Chamber of Com- merce, they are issuing a cer-
•«***iMa«am
iwnp«inn^«<aw>Pt#cooecnnnnnmi«ffWM—
N**
M»
**^
.i*S>NSTITOKo,^^
A. c.T. Division f
^/.
4»
^^/
•< ■»■
^
Thi^K liii:crlir> tllttt
liiis C4im|i1cli:d lilt: rct|tiiri.iiHn|s
CIIIITKAII NUMIiH
k «n|iii. «%%««« wm« «. viL« ih %'^% 4
PAlt
1NtKltl.|J«ltHit
ni«i,iE»Hf
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■•*••••«
oaammmmmm*m
tificate to all amateurs who make contact with any ham in the Copper Country between OOOOZ January 25 and OOOOZ February 1, Only one contact is required for the certificate.
Suggested frequencies are: 3.975. 7.105, T.2S5. and 21.3B5. Listen for CQ WINTER CAR* NIVAL
Send your QSL along with 2 (twoj 20-cent stamps to: Kevin J. Nietzke WDBDQR, 2005D Wood- mar Drive, Houghton Ml 49931*
WORKED BROWARD COUNTY CITIES
The Broward Amateur Radio Club, Inc, sponsors the new WBCC award available to licensed amateurs who submit proof of two'way contact as fodows:
A) Residents of Broward, Col- liers, Dade, Glades, Hendry, Lee» Martin, Monroe, or Palm Beach counties must work all 29 of the following cities listed below.
B) All other amateurs must work 15 of the 29 cities within Broward county.
To t>e valid, all contacts must be verified by at least two fellow amateurs and application must show all logbook information as well as the QTH of the station worked.
To apply, mall your applica- tion with $1.00 US funds and
two first-class stamps (DX sta- tions; send 10 IRGs) to: BARC Award Manager. WD4RAR 1921 NW 41st Street. Oakland Park FL 33309.
Qualifying city contacts In- clude: Coconut Creek, Cooper City. Coral Springs. Danfa, Davie, Deerfteld Beach, Fort Lauderdale, Hacienda Village, Hallandate, Hillsboro Beach, Hollywood, Lauderdale-by-the- Sea« Lauderdale Lakes. Lauder- hill. Lazy Lake, Lighthouse Point, Margate, MIramar, North Lauderdale, Oakland Park, Parkland, Pembroke Park, Pem- broke Pines, Plantation, Pom- pano Beach, Sea Ranch Lakes, Sunrise, Tamarac, and Wilton Manors.
THE SOUTH EAST
QUEENSLAND TELETYPE
GROUP AWARD
This award is open to all transmitting and listening
amateurs who gain award points m the following manner
Australian amateurs must score 5 points and overseas amateurs must score 3 points.
(a) To qualify, a station must, where possible, copy the official station of the South East Queensland Teletype Group, VK4TTY, during a news broad- cast and in the case of a transmitting amateur par-
WBCC
W4>rk€Ht BnnviircJ Cloumy c:itleii
1 4 lljlH I Mh-
I Itr Ht*«^^*iiiL Mil* lit -in Kiiih«* t nui liii
I t'lllllt '^ lli<l1
lui*% srtJiiii|(i|t''H t'Vinf ri' < I M lv\i. \\,i\
1 I If 1 ft ru If IK ^iiinns Willi f triiH m
• is M-ifJ.
l*f«^ii|f-nf
126 TSMagaime • February. 1982
tjcipate in the caJlbaok (2 award points). A portion of the printoul of the news broadcast together with the date, time, frequency, and broadcast number are to ac^ company the request for the award.
(b) Addftionaiiy, a transmit- ting amateur must work three member stations of the South East Queensiand Taietype Group on RTTY (1 point each). Log extracts and/or printouts are to be included with the award application, and each member station may be counted only once towards the award.
(c) Listening amateurs should, in lieu of (b), forward log extracts and/or printouts of three con- tacts involving different member stations of the South East Queensland Teletype Group 0 point each).
Applicants for the award should forward the above infor- mation together with one dollar Australian or 5 IPCs to cover postage and printing costs to ' the Secretary. SEQTG, PO Box 274, Sunnybank; Queensfand 4109. AustraNa.
WORKED ALL BERMUDA AWARD
The WAB Award is issued to amateurs throughout the world by the Radio Society of Ber- muda. To qualify, applicants must submit proof of having worked a minimum of nine (9) parishes in Bermuda as listed below:
1. Sandys
2. Southampton a Warwick
4. Paget
5. Pembroke
6. Devonshire
7. Smith's
8. Hamilton
9. St. George^s
The award is an antique map of Bermuda {20" x 23") suitably
AU ASfiAtt AHMd
class
This award is given to ^3 Mcn^a-2.ftng_ f^^
establishing two way contacts with radio amateur stations in ntentber countries of the ASEAN namely; indonesiat Malaysia, Singa^ pore, Thailand^ and the Philippines,
Awarded Man^ js, /*ao by the ORIENTAL CLUB, Quezon City, Philippines,
DX
inscribed with the recipient's
name and callsign and Is signed by His Exceilency, the Governor of Bemiuda.
The award is not available to stations who worked Bermuda via mobile including maritime or aeronautical mobile. No band or mode endorsements are available. Only one mobile or portable from within Bermuda may be used in making clatmed contacts on your application.
QSL cards are required as proof of contact and they must be sent to the awards manager with sufficient postage for their safe return. The Bermuda Award is issued free of charge! Submit your applications to: Award Manager, PO Box 275, Hamilton 5, Bermuda.
WORKED ALL DU AWARD
This award is availabFe to all licensed amateurs who can
show proof of having contacted at least one station from each of the call areas in the Republic of the Philippines (DU1 to 0U9, ex- cept DU5),
Contacts may be made on any band or mode and special endorsements will be issued upon request for All-Phone. AH- CW. Single-Band, or Five*Band accomplishments.
Contacts for the DU Award must be made on or after January 1, 1970. To apply, for- ward a list of contacts which have been verified by two of- ficers of a radio organization. Your application must show all logbook Intormation for each contact- Send the list and $4.00 US funds only {no IRCs pleasel) to: Edwin Zambrano DU1EFZ, PO Box AC-166, Quezon City 3001, Philippines.
WORKED ALL ASEAN AWARD
The WAAA program requires the applicant to work other
amateurs in the member cpun- tries of the Association of Southeast Asian Nations:
Work 5 Philippine contacts, 1 Malaysian contact. 2 Indone- sian contacts^ 1 in Thailand, and 1 station in Singapore.
Speciaf endorsements will be given for All-Phone, AII-CW, Single-Band, and Five-Band contacts.
Have your list of contacts verified by at least two radio club officials and be sure all contacts were made after Jan- uary 1, 1970, to be valid. Forward appropriate logbook informa- tion in your application along with $4,00 US funds only (no IRCs) to the Award Manager: Ed- win Zambrano DU1EFZ, PO Box AC-166, Quezon City 3001, Philippines,
KAHANER REPORT
Larry Kahaner WB2NEL PO Box 39103 Washington 00 20016
By now you probably know that the FCC gave up m its at- tempt to rewrite the Amateur
Radio Service roles. After spending thousands of dollars and consuming thousands of man-hours, the whole Idea was thrown in the trash compactor. We may never learn exactly what led to the shelving of the
massive revamp nor will we ever ponents caUed the rewrite overly
realize any t>enefit from all that work. However, several FCC em- ployees said privately what we all know intuitively about the project: It was just too big and too complicated to be completed.
You must admit the main premise was sound. Whenever a government agency wants to put its roles Into plain English, we should all support it. tn this case^ it went a little too far. Op-
simplistic and said that many of the fine points of amateur radio were lost In the translation. They also claimed that the question and answer format— which worked so well for the rewritten CB rules— just didn't work for hams. Amateurs, they declared, were intelligent and took of- fense at the condescending stance of Q & A.
Moreover, the bulk of hams who responded to the petition
73 Magazine • February J982 127
for rulemakmg took umbrage at the very beginning of the rewrite proposal which dropped the fa- mous reasons for amateurs' ex- istence: promoting international goodwill, experimentation, and 50 on.
FCC otflcials told us that the rewrite contained many errors and mistakes—not just typos, but in substance as welL And ah though FCC proposals always contain errors, in this case it would have been just too much work to set things right. Normal- ly, the commission works with opponents and proponents alike until the regulations are honed to where everyone can live with them. But for the ham rewrite, there was too much to do, too few staff to do it, and no funds available to keep the project alive.
On one hand, the FCC should be applauded for realizing that it would take resources beyond its
means to complete the task and dropping it now before any more lime and money was wasted. On the other hand, perhaps the commission should be scolded for even beginning a course of action that came under fire from hams at the onset. Even those in the commission ej^pressed doubts as to whether it was nec- essary to rewrite the rules. It's certainly apparent that much of the impetus for change was po- litical (see Kahaner Report, September, 1981), Thai should never be a reason for a govern- ment agency to do anything with taxpayers' money.
So, it seems that hams fought the measure and won. But the question arises—who lost?
OUR OWN CHANNEL 9
Paul Moratto KC5Jig6. from
Universal City CA, mailed the FCC a petition for rulemaking re*
questing that 11 destgnate a par- ticular 2m frequency to be used exclusively as an emergency and assistance channef. Paul also sent us the petition asking for our comment. Here goes.
It's a great idea» Paul, but It's not necessary. Hams donl need the FCC to set aside a special channel for emergency use. Hams can do it on their own.
If hams can set up a national simplex channel {.52) and work out an entire repeater coordina- tion scheme which only tew hams don't adhere to. they can certainly decide for themselves if they want one frequency des* ignated for emergency and as- sistance useonty.
In his petHion, Paul noted: *'Various law enforcement offl* cials have stated that the 2-meter amateur band is rarely monitored due to that fact that no Bmergency frequency has been officially designated ex^
closively for such communica- tion/" Frankly. Paul, I doubt that police departments would t>e willing to shell out bucks for a scanner that would pick up 2 meters or even buy crystals to place in scanners they may al- ready own- Indeed, cops have enough to listen to without keeping an ear open on another frequency. If and when ham ra- dio ranks reach that of CBers, maybe theyll listen— but right now it's not worth it.
Besides, even if they heard a distress call, they couldn't re- spond unless they were li- censed hams. Many police are, but many aren't.
Any hams out there want to start work on a national emer- gency channel? Be my guest. Although I can't answer for the FCC. I II bet they'll tell Paul ex* actly what t just tord you: '1f you want to do it, do it. You don*l need us."
COHTESTS
Robert Baker W82GFE 15 Windsor Dr. AtcoNJ 08004
RSGB 7-MHZ CONTESTS
Phone Section
Starts: 1200 GMT February 6
Ends; 0900 GMT February 7
CW Section
Starts: 1200 GMT February 27
Ends: 0900 GMT February 28
Licensed radio amateurs and listeners throughout the world are invited to take part in this year's RSGB contests. Log and cover sheets may be obtained from RSGB Headquarters, 35 Doughty Street, London, En- gland WC1N 2AE. Please In- dude an SAE.
The general rules for RSGB HF contests, published in the January, 1982, issue of Radio
Communication, will apply. Please note, however, that urv- marked duplicate contacts will be penalized at 10 limes the number of points claimed, and that logs containing in excess of 5 unmarked duplicate contacts will automatically be disquali- fied. Duplicate contacts should be included in your logs, marked BB such, and without any claim for points.
Only RSGB members within the British Isles are eligible, while anyone else worldwide may enter. The only valid operating class is single operator.
EXCHANGE:
RS(T) plus serial number starting at 001.
FBBOUENCtES:
Phone— 7.04 to 7 A MHz; CW —7,00 to 7 04 MHz.
SCORING:
Non-European stations with British Isles count ^5 points per QSO. European stations wtth British Isles count 5 points per QSO. British Isles stations with European stations count 5 points per QSO, 15 points per non-European contact. British
Isles stations may not work each other.
Multiplier for British Isles sta- tions is the number of different countries worked— ARRL DXCC list applies. In addition, each VE, VK. W, ZL, and ZS call area counts as a country for this purpiose.
Non-British Isles stations count one multiplier for each dif- ferent British Isles prefix worked,
maximum of 42. Please note that GB does not count!
Final score for all is QSO points times the total multiplier,
AWARDS:
The Thomas (G6QB) Memorial Trophy will be awarded to the leading British Isles entrant in the CW contest. Certificates will be sent to the entrants placed first, second, and third in the British IsleSp European, and non-
Feb $.7 Feb 6-7 Feb S*7 Feb 13-14 Feb 1314 Feb 20-21 Feb 26 28 Feb 2728 Mar 6-7 Mar 13-14 Apr 17^18 Jun 12-13 4un 26 27 Jul 10*11 Aug 7*8 Aug 14-15 S«p 11-12 Sep 11 12 Nov 6-7 Nov 13-14 Nov 20*21 Dec 4-5 Dec1M2
MLENMR
RSGB 7 MHz Contest— Phone
South Camftna QSO Party
Arizona QSO Party
WAS SSTV Contest
QCWA QSO Party -CW
ARRL DX Contest— CW
CO Worldwide 16{)*Meter Contest— SSB
RSGB T-MHz Contest— CW
ARRL DX Contest— Phone
QCWA QSO Party— Phone
ARCI QRP Spring QSO Party
ARRL VHF QSO Party
ARRL Field Day
lARU Radiosport
ARRL UHF Contest
European DX Contest— CW
ARRL VHF QSO Party
European DX Contest— Phone
ARRL Sweepstakes— CW
European DX Contest— RTTY
ARRL Sweepstakes— -Phone ARRL IBO-Meter Contest ARRL 10 Meter Contest
12fl 73 Magazine • February, 1982
European sections of each contest.
ENTRIES:
Log sheets should be headed; date, time (GMT), callsigrr of sta- tion worked, RS(T) and number sent, RS(T)and number received, if muJtipJJer, and QSO points claimed. A summary sheet is re- quired showing the countries or prefixes worked. Each log must be accompanied by the follow- ing declaration: "I declare that my station was operated in ac- cordance with the rules of the contest and in accordance with the terms of my license." The declaration must be signed and dated. Closing date for receipt of logs Is April 3rd for the phone section and April 24th for the CW section. Address entries to: RSGB HF Contests Committee, PO Box 73, Lichfield, Stafford- shire WS13 6UJ England. In the case of any dispute, the ruling of the Council of the RSGB shall be final.
RECEIVING SECTION:
Rules are generally the same, as applicable, British Isles en- trants should fog only overseas stations in contact with British Isles stations and must record the report and serial number given by the overseas station and the time in GMT. European stations logged count 5 points; outside Europe, 15 points. No more than 20 QSOs made by any one British Isfes station may be fogged.
Overseas listeners should log British Isles stations and must record the reports and serial numbers given and the time in GMT. European listeners claim 5 points per QSO togged; others, 15. A bonus of 20 points may be ciaimed for each British Isles numerfcal prefix logged. GB prefixes do not count, and not more than 20 QSOs made by the same British station may be fogged.
ARIZONA QSO PARTY
Starts: 20C0 GMT February 6 Ends: OaOO GMT February 7
Sponsored by the Arizona Amateur Radio Club. Each sta- tion may be worked only once per band.
EXCHANGE:
BS(T) and state, province, country, or AZ county.
FREQUENCfES:
SSB — 1815, 3895, 7230, 14280, 21365, 28560, CW— 1805, 3560, 7060, 14060, 21060, 28060. Novice — 3725, 7125, 21125, 28125.
SCORING:
Count 1 point per SSB QSO and 2 points for each CW or "ex- otic" mode QSO. AZ stations multiply QSO points by number of states, provinces, and coun- tries. Others multiply QSO points by number of AZ coun- ties. The AARC club station W7I0 also counts as 1 multiplier for non-AZ stations. Anyone working all AZ counties and W7I0 may double the multiplier.
AWARDS:
Certificates for the highest scoring station in each state, province, country, and AZ county.
ENTRIES:
Show each station worked, RST and exchange, plus time and frequency. Include a sum- mary sheet of your scoring and other information, Include a large SASE for results. Mailing deadline Is March 6th and should be addressed to: AARC, c/o Gary Kent KB7VE, 16647 N. 34th Avenue, Phoenix AZ 85023.
SOUTH CAROLINA QSO PARTY
Starts: 1800 GMT February 6 Ends: 2359 GMT February 7
The QSO party is again spon- sored by the Colleton County Contestofs. The same station may be worked on each band and mode, simplex only. SC mobile stations that change counties are considered new stations* Novice and Technician stations please sign IH or U,
EXCHANGE:
RS(T) and state, province, country, or SC county.
SCORING:
Phone contacts are worth 2 QSO points, CW contacts are worth 3 points. The multiplier for SC stations is the number of states, provinces, and DX coun- tries worked. Others multiply QSO points by the number of SC counties worked (46 maximumj.
FREQUENCIES:
Phone~3895, 7230, 14280, 21365, 28560. CW— 3560, 7060, 14060, 21060, 28060. Novice— 3725, 7125,21125,28125.
REmJS
RESULTS OF THE 1931 OHIO QSO PARTY
|
Ohio |
KA2EPS |
ENY |
5,550 |
|
|
Stations |
Score |
K9GDF |
Wl |
4,008 |
|
WB8M77 |
1,501,640 |
W2EZ |
WNY |
3,900 |
|
KB8EI |
820,155 |
KA8LPV |
M( |
3,810 |
|
WBSJBM |
666,000 |
K8EIO/3 |
MD/DC |
3,430 |
|
WDSALG |
448,707 |
N04P |
KY |
3,360 |
|
KA8HXX |
428,736 |
WB3IET |
WPA |
3,240 |
|
KC8JH |
339,000 |
W40VT |
GA |
2,940 |
|
KFBK |
206,550 |
WB4ZPF |
VA |
2,875 |
|
N8AKF |
163.674 |
NOCLV |
KS |
2,314 |
|
KASIAH |
1 48,830 |
N1BDB |
CT |
2,180 |
|
KA8CTL |
104,636 |
W4KM3 |
VA |
1,692 |
|
KB8AC |
100,940 |
WB3FNS |
MD/DC |
1,628 |
|
N8JJ |
47,120 |
N4CD |
VA |
1,552 |
|
W8DXT |
45,628 |
KG9Z |
IL |
1,482 |
|
WA8WFX |
39,285 |
WB9CWE |
IL |
1,364 |
|
WD8MC0 |
33,178 |
WA3JXW |
E PA |
1,232 |
|
KB8WB |
31,820 |
WA3GNW |
EPA |
828 |
|
KA8IGM |
31,620 |
WB9NRK |
Wl |
780 |
|
WB8MIP |
28,968 |
K2NC |
W NY |
737 |
|
W8HFK |
26,048 |
WBIGLH |
MA |
672 |
|
NBDCJ |
23,408 |
W4LEP |
TN |
588 |
|
N8BJQ |
12,810 |
WA9MRU |
IL |
676 |
|
W80JM |
3,335 |
WB7TJI |
ID |
351 |
|
W8VPV (CI I |
lb Station) |
KA1VE |
MA |
340 |
|
183,012 |
N5AFV |
OK |
306 |
|
|
KA2EG0 |
N NJ |
208 |
||
|
Out of |
AK7J |
ID |
165 |
|
|
State |
Score |
KF2T |
NNJ |
132 |
|
WAeAVU9 |
IL 11,086 |
KB9Ti |
IL |
90 |
|
W4F0A |
VA 10,480 |
K1BV |
CT |
60 |
|
AWARDS: |
made with |
"caotive" |
stations. |
Certfficates to top scoring station in eacti SC county, state, province, and DX country. Nov- ices and Tecfinicians compete only with other Novices and Technicians,
ENTRIES:
Include a summary sf^eet with your entry showing scoring and other information. Indicate each new multiplier in your log as it is worked. Novice and Technician indicate cJass on your entry. In- clude a large SASE for results. Mailing deadline is March 5th; send to: Colleton County Con- testors, c/o Elliott Farrell, Jr. WA4YUU, PO Box 994» Walter- boro SC 29488.
QCWA QSO PARTY-CW
Starts: 0001 GMT February 13 Ends: 2400 GMT February 14
This is the 25th annual QCWA QSO party with separate week- ends for CW and phone. Con- tacts with the same station on more than one band can be scored only once. Contacts
such as when operating in local nets, are not valid.
EXCHANGE:
QSO number, operator's name, and QCWA chapter iden- tification (official number or name). Members not affiliated with a chapter should use "AL".
FREQUENCIES:
Any authorized amateur fre- quency is permissible. The fol- lowing suggested frequencies have been selected to minimize rnterference to others: 3530- 3560, 7030-7060, 14030-14060, 21040-21070, and 28040-29070, These are selected as a starting piace. When pileups occur, don't be afraid to go either side of these frequencies,
SCORING:
Each contact made with an- other QCWA member win count as a single point. This year's contest has two multipliers. The first is the same as in years past: each chapter is a multiplier of one. The second is that DX sta-
73 Magazine * February, 1982 129
QSL OF THE MONTH
Call us chauvinists* but the beautffut rendition of the New Hamp- shlfe countryside on this attractive card wins WBlGGQ hrs choice of any book in T3's Radio Bookshop.
Is your card a winner? To enter, place your card in an envelope along with your book selection and mail to 73 Magazine, Pine Street, Peterborough NH 03458. Atlention: QSL ot the Month. To be eligible, your entry must be sent in an envelope and must be accompanie<l by your book selection.
tions are a multiplier of two. DX stations are defined as Europe, Africa. South America, Asia, and Oceania— the same as for WAC of ARRL. Contacts within your own country count oniy as a chapter multiplier. Final score is then the total QSO points times the sum of the number of chap- ters and DX stations worked.
AWARDS:
Plaques for the top phone and top CW scorefs. Certificates wilf be given for the 2nd through 5th runnerS"Up in both the phone and CW Parties. Standings and scores will be published In the QCWA News, Issue of summer, 1982.
ENTRfES:
Logs should include the fol- lowing information: lime (GMT), call QSO numbers* name, chap- ter number or name, state or country. It is the responsibility of each contestant to provide a legible log, no carbon copies, and to list alt claimed contacts.
The total contacts for each page win be recorded at the bottom of each page. The total contacts for the Party should be recorded at the top right of the first page of the log. Log sheets will not be returned. Make sure you have correct postage when you mail your logs. Send logs no later than March 31st to: Pine Tree Chapter 134, Glenn Baxter K1MAN, Long Pond Lodge, Bel- grade Lakes ME 0491 8. Separate logs and scores must be sub- mitted for the CW and phone parties,.
Work as many QCWA mem- bers as possible and appiy for the severai special QCWA certif- icates which you have quali- fied for in the QCWA Parties: Worked 50 States. Worked 60 Chapters, Worked 100 Mem- bers» and Worked 500 Members.
WAS SSTV CONTEST
Starts: 0900 EST February 13 Ends: 2100 EST February 14
Sponsored by amateur televi- sion's A5 Magazine. Use all au-
NEWSLETTER CONTEST WINNER
Humor is a key part of this month's newsletter winner. The Narional H^mpoon, published by the Cleveland-based South East Amateur Radio Club, is chock full of puns, good-natured put*downs, and inside jokes. Editor KA8KTR is not above pok- ing fun at himself or the 33-year-otd club. Besides being fun to read. The National Hampoon provides a deluge of information about what individual club members are doing. Don't lei your club's members fall into the trap of not reading each newslet* terTry adding some life and humor; the readers will anxiously await the arrival of the next issue.
thorized and recognized SSTV operating frequencies within the HF bands. Attempt to work as many SSTV operators from other states as possible during the 36-hoyr contest period. The emphasis is on quality, not just quantity.
SCORING:
Count 25 points per contact with 10 bonus points awarded for live exchanges of "mug- shots/' color two^way contacts, or 256 or 128 (t/2-speed) mode transmissions. Add 100 points for each new state listed. Alaska and Hawaii contacts count a bonus factor ot 500 points!
EXCHANGE:
Station calls and signal re- ports must be exchanged in vid- eo format by either camera, key- board, or light-pen generators.
A WARDS:
First place winnner receives a S-year subscription (or renewal) to A5 Magazine, a framed Spe- cialized Communication Certifi- cate, and his photo published on the front cover of the magazine. Second- and third-place winners receive 1-year subscriptions and certificates. All contestants will receive gold certificates with submitted logs.
ENTRIES:
Submit actual or copies of contest log sheets by no later than March 1st to Contest Man- ager, A5 Magazine, PQ Box H, Lowden lA 52255. Official re- sults will be published In the May/June issue of AS Magazine. Those winners attending the Dayton, Ohio. Hamvention will be awarded certificates at the regular ATV Forum meetings.
CO WORLDWIDE 160'METER CONTEST--SSB
Starts: 2200 GMT February 28 Ends: 1600 GMT February 28
EXCHANGE:
RS plus a three^iglt contact
number starting with 001, US stations include state and Cana- dians include province.
SCORiNG:
US and Canadian stations count 2 points per QSO with other WA/EA^O stations: DX con- tacts are 10 points each,
DX stations count 2 points per QSO with stations in the same country and 5 points with sta- tions in other countries. QSOs
with W/vevO stations are 10 points each.
All stations count one multi- plier point for each US state, VE province, and OX country. KH6 and KL7 are considered DX. Fi- nal score is total QSO points times the sum of multipliers.
AWARDS:
Certificates to the top scorers in each state, VE province, and DX country. Additional awards if the scores or returns warrant.
Two plaques are t>eing award* ed by the West Gulf ARC. both for single operators, one for the highest scoring US station and the other for Europe. The World Champion in the contest will receive the John Doremus WilAW Memorial Plaque from friends of WHAW. This plaque may be won only once by the same station in a three-year period.
PENALTfES:
Three additional contacts will t>e deleted from the score for each duplicate, false, or unverl- fiable contact removed from the log. A second multiplier will also be removed for each one lost by this action*
Violation of the rules and reg- ulations pertaining to amateur radio in the country of the con- testant, or the rules of the contest, or unsportmanship con- duct, or taking credit for exces- sive duplicate contacts or multl* pfiers wiii be deemed sufficient cause for disqualification. Dts- qualified stations or operators may be barred from competing in CO contests for a period of up to three years,
ENTRIES:
Sample log and summary sheets may be obtained from CQ by sending a large SASE with sufficient postage to cover your request. It is not necessary to use the official form; you can use your own. Logs should have 40 contacts per page and show time in GMT. numt)ers sent and received, and separate columns for QSO points and multipliers. Indicate the multiplier only the first time It is worked*
Mailing deadline for SSB en- tries is March 31st- Logs can be sent directly to the 160 Contest Director, Don McClenon N41N, 3075 Florida Avenue* Melbourne FL 32901 USA. Alterr^atively. they can be sent to CQ, 160- Meter Contest, 76 North Broad- way. Hicksville NY 11801 USA,
130 73Magazme • February J 982
W2NSD/f
NEVER SAY DIE
ecfitor/a/ t>y Watyne Gr&en
show them around. Have the 450-MH2 band? How about 220
from page 8
*'TWi section shalf not appfy to re* celvjng, divulging, publishing, or util- izing the contents of any radio com- munication whJch Is transmitted by any station for ihe use ot the general public: or which refers lo ships, air- craft, vehicles, or persons in distrets; or which is monitored pursuant lo section 4(fK6) and which is received, divulged, or used In any investiga- tion or enforcement action by the Commission."
Explanation
This amendment conforms §605 to §4<f) to accommodate proposed lan- guage to permit use of volunteef monitors.
Here Is another way that ama^
laurs could help the Commis- sion cut down on their costs. Not that they are spending a lot monitoring the ham bands these days anyway . . . and who needs *em? But with the rules changed so that amateurs could set up a moniloffng system, we would be able to clean up a lot of miseries which are now plagu- ing our bands.
We have tens of thousands of retired hams and several thou- sand more handicapped hams, ail with loads of time on their hands and an eagerness to be of value. WelL here is a service thai these hams could provide which would be priceless to us. IVe talked with the FCC commis- sioners about this and they seem to be enthusiastic about the concept. You see. not only could hams be organized to monitor the ham bands, but they could also assist the FCC moni- tors in watching over some of the non-amateur bands, too.
If we once started getting into this monitoring idea, it would not be long before innovative hams would start coming up with automatic bamS scanners and receivers which would be connected to microcomputers and would program themselves to fisten for unrecognized trans^ missions. With digital receivers and frequency counters, it is on- ly one more step to a system which wiil keep track of what signals are okay on what fre-
quencies and spot the anoma* lies quickly so they can be Identified.
Not onfy would this be of great help for digging out emergency signals fast, but it would be even better protection against illicit transmissions in- volved wfth spying and drug traf- fic and so on. Coded transmis- sions? We have some mighty sharp ham cryptographers who would love to have challenges like that.
Why should the government spend wads of money doing something which we not only could do but probably could do better, and which we would enjoy doing?
YeSj a ham monitoring sys- tem would take some organiza- tion, but it wouldn't be difficult to handle. Much of the work could be done over the air, with unknown signals spotted and triangulated via a ham net. And with hams everywhere, even the UHF channels could be watched over in every part of the country. This would raise hell with crooks using CB or HTs on commercial channels to coordinate crimes. There would be no safe frequen- cy or place in the country for them. Pity.
FRIENDLY CLUBS
Several letters from readers have made mention of a situa- tion which I've noticed in some clubs I've visited... a lack of friendliness. Oh, it isn*t inten- tional ... but it is a drag. I sug- gest that club officers take a good critical look at the way their club is working and start doing something about it.
When someone new comes to a club meeting he (or she!) should be met by members and introduced around. Each person shoutd have an identification badge so newcomers will know to whom they are talking. Mem- bers of the club should be aware that It is their responsibility to go out ot their way to be friendly with any new- comers. . .to talk with them, ..
glad hand out When the newcomer arrives,
try to find out about him. . .his call, If licensed. . .or if he is not yet ficensed and might be inter- ested In coming to the club li- cense classes. . .what bands he works . . . and so on. Then get up at the meeting and introduce the newcomer and tell about his background so the others will know him. Make a big deal out of the newcomer and he will be back. You won't be able to keep htm away wfth a stick.
In case you haven't noticed it, darned few hams are outgoing. The gregarious ham is unusual. Most hams are loners who may do just tine on the air, but are afraid to talk on a one-to-one ba* sis. You should recognize this and gear your club meetings to overcome this situation. If you have a table where they can show their new and exciting QSL cards. . , that's a conversa- tion breaker. Another table where they can show something they've built is another winner. Perhaps a spot to show off new- ly-purchased ham gear. , .stuff that is just recently on the mar- ket. Everyone is always interest- ed in new rigs and gadgets. Anything you can work up in ways to get members showing and telling will break the ice and help everyone have a good time. . .and it is a good time at meetings which witi bring *em back alive next month.
This isn't the time to get into the details on how to run a ham club, but I wifi just touch on some of the basics. Remember that when you are runnmg a ham club you are in show busi* ness. You want to keep for the board of directors as much of the dull business aspect of the club as you can, letting the meetings be times when you are entertaining the members.
What is entertaining? Well demonstrations of unusual modes of communications are winners. You probably have someone in the area who is working with slow scan and can knock the socks off the mem- tjers with color slow scan. Or perhaps some members are into computerized RTTY communi- cations. Anything on 10 GHz? Any new antennas popped up which can be shown on a black- board and explained? Slides of a Dxpedition are great fun.
How much do the members know of what is going on in the
73
MHz? Anyone working with SSB on 2m? How al>out aurora OX- ing, meteor-scatter DXing, moonbounce?
Manufacturers will go a long way to show their products when they have something new. Keep your eye on the new prod- ucts section of 73 and see what you can generate. They want to show their products and they also want to get feedback from your members on possible new products. They need both the sales and the Input.
DEREGULATION
The interest In deregulation by the Commission got started back in 1974, triggered by the en banc hearing at which a group of amateurs testified as to the need for deregulation. This turned out to be a matter of do- ing the right thing at the right time. , .as the Commission was just at that time getting interest- ed in the concept. The hearing made clear the need for deregu- lation of amateur radio, and the Commission started with our service, intending to use it as an example of what could be done.
The hearing, by the way, was In response to the then-new reg- ulations on repeaters, which were particularly onerous. Lack- ing any initiative from the ARRU I got representatives together from repeater groups all around the country to testify before the Commissioners. If anyone Is in- terested^ I have a tape of this historical confrontation. The ARRL refused to participate, putting the effort down as naive and useless. The result was the biggest change in our rules ever brought about.
Of considerable significance is a recent paper (August, 1981) from the FCC. This is a working paper on deregulating the per- sonal and amateur radio servic- es. The paper is quite candid . . . surprising in its frankness. There are some interesting con- cepts., ."many .. .agree that the goals of expanding techni- cal skills and manpower and ad* vancing the radio art have failen on hard times in recent years." It goes on, "If there is criticism of amateurs for not being tech- nically more advanced, it could be misdirected. Perhaps one should place some of the re- sponsibility on the regulations^ not the licensees. Substantially more regulatory flexibility than
Magaitne • February. 1982 131
the service now has would be desirable."
Frankly, that's an understate- ment.
The other day, on my way down to Ffofida to give a talk to a group of accountants who are using TRS-SO systems, 1 stopped by Tytts Electronics in Hudson, New Hampshire. Chuck recently moved from down near Boston to tax-free New Hampshire, thus saving nearby Massachusetts hams a bundle on their pur- chases. ThjB new Yaesu FT-208R HT had just arrived, so I bought one.
As I punched up the channels on the synthesizer, program- ming the unit to scan several lo- cal repeaters and a simplex channet or two, I got to thinking about the whole two-meter US vs. Japan situation. Having been in the 2m ham field for over 40 years, 1 remember how things got started.
The first FM rigs were con- verted commercial systems, mostly by Motorola and G.E.— monsters, dumped on us when the commercial two-way specs were changed, rendering tens of thousands of taxi and police transceivers obsolete. Then came a rig from I.C.E. (in Texas) which never got to first base. . . mostly because it didn't work very weJl. The next try was from Galaxy (Missouri). Though un- stable and much too large, it sold reasonably well. The engin- eering design was dismal. Ed Glegg, who had been building VHF equipment for us for years, came up with one of the better FM rigs of the time, but by then some of the Japanese equip- ment was starting to arrive.
loom was designing very nice equipment, and it was selling welL Unfortunately, the com- pany was taken to the cleaners by a crooked Arizona importer/ distributor. Nothing daunted, Mr. Inoue, the president of the firm, came to the US and shopped around for a new im- porter, He also asked a lot of questions about what kind of new equipment was wanted, . , and listened carefully to the answers. The result was the IC-230, the first synthesized ham rig. Before that, the best- selling rigs were from Standard and featured ever more crystal sockets. I got to where I had to have hundreds of crystals on hand to cope with all of the re- peaters going on the air. . .and the many different rigs.
Mr. Inoue said that he would some day be able to put a syn- thesizer into an HT for us. Well^ we knew It would happen, but it seemed like a dream. You know, there was a small outfit out near Buffalo, New York, which came up with a synthesizer early in the game, but they never really fol- lowed up on it. It started out as a club project and then changed into a business. I think if they'd piayed their advertising right they could have developed into a large busmess by now with perhaps $50 million in sales.
Another firm which had a crack at it and dropped the ball was Vanguard, down on Long Is- land. Andre developed a synthe- sizer to plug into the older rigs, but didn't take it the next step,
It isn't really fair to put down US firms for losing the baJ! on
One of the facts of business is that the more of the product you make, the cheaper it is to manufacture, When you double the production of a piece of equipment, the cost of making it goes down 15-25%. So this bunch of eager buyers in Japan has done two things to the ham equipment market. First, their enthusiasm has encouraged the Japanese firms to keep up a continuing deveiopment of new equipment. The volume of sales has forced American firms out of the market because the Japanese equipment has been both better and cheaper in most instances.
Where the shoe really begins to hurt is that we are now seeing the results of the over 500,000 Japanese hams and their enthu- siasm. These chaps have now
WARNING Due to numerous compEalnts received from readers who have dealt with Electronic Specialties, Inc., of Miami, Florida, we have discontinued their advertisements and urge all readers to use caution when dealing with this firm.
FM equipment. . .or any other ham gear for that matter. You see, the Japanese went right on by us in the number of licensed hams, so their firms had a great advantage. Not only did they have more hams, but their hams were much more enthusiastic and active than we were. Ama- teur radio really took hold in Jap- an when they got rid of the Morse code requirement. Clubs sprang up in high schools all over the country, and today they have double to triple the number of active hams that we have. Further, their spirit is almost unbelievable.
Have you even thought of go- ing on a DXpedition? Well, the Japanese have organized DXpe- ditions where they have had about 400 active hams going along and getting on the air! When you read the Japanese club magazine you find that it is packed for dozens of pages a month with pictures of club ac- tivities and outings. We don't appear to have a single club in the US which even comes close to the enthusiasm which has spread through Japan... at least rm not familiar with any. I've asked several times for pic- tures of any outstanding club activities for publication in 73. . .nothing yet
gone from high school through college, on into industry, and are wiping out the American consumer electronics industry. Their rate of graduation of en- gineers, technicians, and scien- tists has zoomed past ours.
)n this respect, amateur radio has let America down. If you stop and think about it, most technical career people gel started in their teens. By stop- ping the growth of amateur radio in 1963, with little since then, we have managed to kill off virtually a whole generation of technical people. Unless a person gets interested in elec- tronics in high school, there is little reason for him to go into electronics as a career. So now we have a bunch of philosophy and liberal arts majors wander- ing around looking for work, . . while our electronics industry is getting wiped out by Japan.
There really Isn't much we can do about the situation right now. We will be outgunned in technicians for some time to come. If we are going to get back into the driver's seat, we are going to have to figure out some way to get a whole genera- tion of teenagers interested in technical careers. That's quite a challenge.
In the meanwhile, as I go fur-
ther and further into the instruc- tion book for the 208, I wonder what next in HTs. With the LCD display of the frequency, the 208 should have a substantially longer battery life than the 207. 1 like the scanning system, , .just what I've wanted for years, wherein it scans, stops on a busy channel for a few seconds, and then continues scanning. You can set it up for a priority channel ... for instance, I gener- ally monitor 147.540 for simplex calls. They've even made the battery compartment so that you can open it without a coin.
I picked up a mailing piece at Tufts which was rather clev- er, . .and sad. The headline on it was, "Where have all the ama- teur radio stores gone?'' Then there are drawings of eleven graves with headstones for the eleven Greater Boston ham stores which have gone out of the ham business {or just plain out of business) in recent months.
With the recent even further
drop in new licensees down
around 35%... ham stores all around the country are folding. The ones that seem to be failing the most are those which had lit- tle slogans such as, never un- dersold.. .call for low, low prices. . .20% off. . .and soor^. You know, unless we do some- thing about all this, amateur radio will soon be little more than a retirement playground for elderly hams.
I admit to getting a bit frus- trated when I visit some ham ciubs and find that many of the members . . .old-timers, of course. , .are prepared to resist any efforts to bring in new hams as much as they can. They don't want the QRM . . . and they don't much enjoy talking to young hams... and don*t want them trying to join their club. They would like to raise the code speed to 50 wpm and have every* one coming in pass the Extra class license exam, . ,and then get restricted to the CW bands for a few years. They like OST, not 73. These chaps are turning amateur radio from a friendly fraternity into an old farternily.
Apropos of the mention of the 1963 debacle, I looked back over my editoriais and found that I had indeed predicted at thetime that one of the resu Its of the pro- posed rules change would be the demise of a great many deal- ers...and manufacturers, About 75% of the ham dealers
132 73Magazine • February, 1982
went out of the ham business as a result . . . and most of the man- ufacturers. It's inlerestlng to see the old ads for Hammarlundf HalUcrafters, National, John- ston, Squires-Sanders, Central Electronics, Lakeshore, Multl*EI- mac» United Tfanstormer, Stan- cor. Bud, Gonset, Polytronics, and so on. It sure wiped 'em out.
The 208 is a great rig. . . but \i is not a breakthrough Into any- thing really new, II we're going to get amateur radio pepped up, we have to get into the ^s and digital communrcatlons tech- niques. We really have nothing new to be excited about. FM is a bore for most of us . . . and heck, DX has been around for a Hfe* tiffie. What have we that is really new and fun? We need some* thing to get our |ulces flowing.
What have you got?
HAM WATCH REPAIR
Eventually, those Casio C-60 and C-90 watches run out of bat* tery and need to get a battery re- fill The replacement of the bat- teries fsn't a really big deaL . . you can probably do it. Or, of course, you can fire it back to Casio for their $tO repair charge. Many Jewelers are afraid of dig- ital watches and claim they can't fix them. Tsk. t
You can run into a problem with the Casio watches fn that \ they often do not start when you replace the batteries. You have to short out the battery cover and a nearby metalHc dot marked ''AC" with a wire, tweez- ers, or even a paper clip to get/ " the watch to start again. Jewel- ers have gotten instructions on this, but often Just don't want to be bothered. . .or didn't read the instructions.
The C-80 and C-90 Casio watches, which I've written about before, are the ones which did the most to put both Texas Instruments and Commo* dore out of the watch business. Casio came out with a $50 watch which knocked the socks off everything else on the mar* ket More and more of us around the magazine are wearing the C-90, beeping away every hour in unison.
My thanks to WB90JD for the battery information on the watch.
GETTING RICH
Firms which are publicly held have a problem that privately owned firms don't have to worry
about: making ever more money to keep the stock prices high.
This came to mind when I got a tetter the other day. . .and not the first one, , .saying that the reason I want ham growth is so that f can make more money from 73 Magazine. Let's take a good look at that cop-out*
First point. If I were interested in money, spending tfme on try- ing to get amateur radio growing would be one of the last ways t would invest my time. The real money today is in microcomput- ers, and the maximum return for hours spent is obviously In that field. Every time I start a new computer magazine, I generate a couple of million dollars more cash flow for us and bring em- ployment to a bunch more peo- pie. I also help the microcomput- er field to grow by virtue of the communications I bring atx^ut. No, from a business point of view, I could care less whether amateur radio grows or not. If I were to fold up 73 Magazine, we'd make more money using the people and facilities for the much, much more profitable computer publications. But Td miss a lot of fun. . .and amateur radio would lose a lot of artrcfes and enthusiasm.
Point Two. Even if we got Into a great growth pattern and 73 Magazine started to make a huge profit, the money would go toward my real goals, not to me. My goals are to provide educa- tion through my publications and through any other medra available. If I had a million to spare right now, I would quickly put it Into the development of Hawthorne-Green Institute, a college to teach electron- ics, communications, and computing.
I seriously doubt if many read- ers spend much less on them- selves than I do. I do have to buy clothes so I look well, even If I begrudge the expense. That's part of being in business. My en- tire life revolves around the business. I grab breakfast at my desk, have a business lunch al- most every day. . .or else I eat an apple and cheese at my desk. Dinners are often with advertis- ers, at ham clubs, computer shows, or on trips to visit manu- facturers. I don't think my wife and I get together to eat dinner at home ten days a year. She, too, is wrapped up in our busi- ness, and we shiare a two-room apartment in the old house that is our headquarters building.
I'm serious about trying to get American technology back into the lead and I think I have the key to this. If you were in my shoes, wouldn't you feel that was a worthy goal? Further, 1 think it is a goal \ can achieve.
Probably the *^richest" time of my life was back in the mid-50s when \ was the editor of CQ and also the president of a small hi-fi manufacturing firm. I made a big S15.D00 at that time, which is a whole lot more than Vm making now in today's dollarettes. I was able to support a home, family, a seaplane, an Arabian horse, a small yacht, and two Porsches. One of the things which I learned was that toys like those own you, not the other way around. Tlie horse had to be ex- ercised every day... and trained. The Porsches needed constant service, most of which had to be self*provided. The damned yacht had to be scraped and painted every year or so, the engine worked on, and so on. The plane? You have no idea of misery until you own your own plane, it cost more per year to own and run than any two of the other toys. It was fun and Tm glad I did it, but I'm all over wanting yachts and planes.
Money has value only for what it can do towards my goafs, if I can generate more, I can do more. . .and there is far more satisfaction In that than having a pocketful of hundred- dollar bills. . .or a bankfuL
I have this dream of being able to help get amateur radio into more countries . . . as a way of helping those countries to grow. Countries have a desper- ate need for electronics and communications experts. . . technicians, engineers, and sci- entists. The best way, by far, for getting these needed people is via infection of teenagers with the virus of electronics... and that means amateur radio. It works f
If the United States is going to stay on top over the next genera- tion or two, we need to invest in technical people, Tm working on that via my push to get amateur radio and computer clubs into every high school in the country. I'm also working on it via my Hawthorne*Green Institute concept ... a college which is geared to the 1960$ and 90s... one which will feature high-speed concentrated educa* tion in both technical matters and business. My aim is to pro
vide the education which will bring us tens of thousands of entrepreneurs, all with elec- tronics and computer back- grounds. Let's see any country get ahead of us then!
So, when someone puts me down as looking to make mon- ey, agree with them... and point out that so far I have a good record of investing that money for the benefit of ama* teur radio and computing... and, I hope you'll agree... for our country.
My ideas on how a college should be are spreading, Vm get- ting calls and visits from educat- ors who are interested in the plan and who see it as a way to guJde their schools into sol- vency in the next few years. With many private colleges failing, some radical change is needed. My talks on the subject in Brazil and South Africa brought great intereat, with invites to come back and get together with gov* ernment officials to further pur- sue the idea.
No, If I was Into a personal for* tune, one of the first things I would do would be to stop writ* ing editorials, which Vm sure would immediately increase our circulation by about 50%. The next would be to stop my cru- sades, such as the very costly one twenty years ago to self sideband to the readers— who hated it and fett that AM was the only way to go. Or the effort in 1969 to get amateurs interested In a little-known mode: NFM and repeaters. While I published hundreds upon hundreds of arti- cles on repeaters and NFM, or* ganlzed FM symposiums, put out a repeater bulletin, and doz- ens of books. . .the readers re- volted, with about 20,000 drop- ping the magazine in disgust. Oh, most of 'em came back, sending me notes saying that, golly, rd been right, sorry about that. But it was rough going for several years.
Not having a house or **family life" to take up my time, and not having a yacht, plane, horses, and dogs, \ have the time to read so that I can keep up on comput- er technology, ,, time to keep dozens of business projects go- ing, .to personally use comput- ers, video cameras. . . to go ski- ing occasionally, to travel... and even get on the air more than you might think. I have the time to write my editorials and even articles for other maga*
73MagBzme • FebruaryJ082 133
2ines. I can get to Florida to give a talk on computers to an ac- counting group (expenses paidh to participate in a workshop on how to start special interest magazines (at the Folio show in New York). . . to get to South Af* rica and address data pfocess- ing professionals on the impact
of microcomputers. . .and so on, I do have to give up some things which are important to most people in order to do what I enjoy. . , pursuing my goal of ed- ucatlon for as many people as possible.
It doesn't take money to do many of the things \ do— just
time management, I was able to set the 10.5-GHz record for states worked with borrowed equipment because I was will- ing to go up a damned mountain at all hours of the day and night for skeds. . .freezing my gaiuc- CIS off.
Of course, if I get a lot of stat-
ic about getting rfch, I can al- ways find some sucker to buy me out and go for a twenty-year sail around the world, charging $50 a contact to the Honor Roll hams, and live like a king^ An en- terprising ham can make $50,000 a year or more that way, as we have seen in the past.
RTTY LOOP
Marc i Leavey, M.D. WA3AJR 4006 Winlee Road RandatlstQwn MO 21133
One of the fastest growing phases of RTTY these days, at least as evidenced by the ques- tions I receive from readers of this column, is "computerized/' or at least video, RTTY, More and more, the amateur is getting away from the old grease- monger of mechanical tele- printer and turning to one of the oew microcomputer systems.
One of those systems hams appear to be turning to is the new Radio Shack TRS-30C{R), the so-called "Color Computer." Based on the powerful Motorola 6809 central processing unit, the TRS-80C appeals to the ham on many levels. Until recently, however, little was available in the way of RTTY software for this computer.
Now, Clay Abrams K6AEP, an author whose works are well- known to the readers of 73, Is of- fering some rather nice software for the TRS-80C at reasonable prices, Appealing to both the RTTY and SSTV enthusiast, Clay has put together some rather nice packages.
For the slow-scan television (SSTV) operator, Clay has three programs of varying degrees of capability. SSTV 7.2 converts the TRS-80C to an SSTV key- board for sending frames of five lines each consisting of six characters. The next step up is SSTV 7.3, which expands the previous system to include an SSTV keyboard, color keyboard, video mixing, and joystick graphics. His ultimate system is SSTV 7.4, which allows gray- level picture transmission and reception, color-picture recep- tion, tape-save ability, and many other features. The cost? SSTV
7.2 IS only $20, and SSTV 7.3 and 7.4 are $30 each.
Not interested In SSTV, huh? Well, Clay has a few good RTTY programs, too! His bottom-line RTTY program, RTTY 7,01, al- lows RTTY transmission and re- ception in Murray and ASCII at all common rates. Three trans- mit buffers, an RY buffer, and a CW identifier are also provided. All this for $20. Clay's top- line program, RTTYCW, pro- vides RTTY transceive, CW trans- ceive, random code groups, split-screen display, multiple buffers, and tape saving. Requir* ing an external demodulator and CW interface, the program sells for the lofty sum of $30.
I nterested? Drop Clay a line at Clay Abrams Software, 1758 Comstock Lane, San Jose CA 95124. Be sure to mention that you read about it in RTTY Loop, OK?
Interest in older machines is still around. Chuck Euola K8YPU, of Redford Township, Michigan, is using an Altair eaob. This M6800-based com* puter was introduced shortly after the Altair 8800, the "origi- nal" B080 computer. Chuck is in- terested in receiving RTTY with his 680b, and wonders if some of the programs published to run with other 6800 systems will work. Other than changing the 1^0 address, the biggest prob- lem you may have is with the slow speed of the 680b, as the clock runs at 500 kHz, roughly one half to one quarter of most other 6800 systems. However, you might try halving the con- stant in a delay loop, as calcu- lated for a 1-MHz system, and then fine tuning as necessary. The program published in this column back in July, 1978,
should work reasonably well 134 73 Magazine • February, 1982
Not everybody likes a com- puter, though. I have a letter here from Richard E. Christina, in Pahrump NV, who writes, "I need a transmitter strictly for RTTY. . J would like about 200 Watts, 100% duty cycle, tubes, vfo. . . I do not desire to use a computer at this lime."
Well, Richard, first of all, let's get our apples and oranges straight. The computer, if you use one, replaces the mechani- cal teleprinter, not the transmit- ter and receiver. No matter what method you use to display the RTTY signal, from an ancient Model 12 to a Whiz-Bang 6880 Micro^Term, you still need a transmitter, receiver (or trans- ceiver), and antenna to get on the air.
Now, to the point of your question. A look through the back issues of 73 or any other amateur radio magazine or handbook will turn up many cir- cuit descriptions for CW trans- mitters. Basically, that's all a RTTY transmitter is: a CW, I.e., continuous wave, transmitter in which the frequency determin- ing element is modified by the digital RBY information. Adding that modification to the vfo, for example, involves a simple diode-capacitor combination, called a "shift pot," that we have covered in this column several times in the past few years.
As for the teleprinter itself, finding information on this ma- chine or that can also take some
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doing, 1 have another letter here from K. D. Hardin KC51I, out in Albuquerque NM, who recently purchased a Teletype® Model 3320 and is looking for data on hooking It up. The 3320 is the "I/O" version of the Model 33, and is a very useful machine. This machine is designed to work in a 20'mA loop, and con- nection is via either a nine- position terminal strip or a twenty-pin plug, located on the back of the call control unit. This is the right rear corner of the machine, as you face it. Fig. 1 is a diagram of the nine-pin strip, terminal strip 151411, at the rear of the machine.
Unfortunately, not all Model 33s are alike, and minor differ- ences In the call control unit can lead to major difficulties in hooking the machine up. Manu- als are available from several sources; see the ads in this mag- azine for current availability.
I have a note here from Jeffrey A. Maass K8N0, who relates that RTTY DXers will have an op- portunity to add Anguilla (VP2E) to their DX totals between Feb- ruary 23 and March 3, 1982. A group of contesters will travel to Anguilla to participate in the ARRL CW and SSB DX contests between February 15 and March 10J982, and will be taking along a complete RTTY station. Ama- teurs using the calls VP2EV (QSL to K8ND), VP2EJ (QSL to WA8C2S), and VP2E0 (QSL to
TEfiHIHflL STRIP
PRINTER'
COMMO*i
KE^BOARO
Fig. 1. Modef 33 teletype hookup.
WB8VPA) will be operating in the time slot detailed above. Good luck!
By the way, the number of you (merested in BTTY DXing does seem to be growing. Not only for two-way communications, but for looking for those rare press
and commercial stations, too! Lt. Mike Anderson, with the U.S. Navy in Europe, is one of those folks. So 1 am happy to let you in on a little tip. A few months back, I mentioned Tom Harring- ton's book, Worfd Press Servic- es Frequencies, in this column. Available from the 73 Radio
Bookshop at $5.95, this book contains iistings of hundreds of commercial and governmentai RTTY stations. One of the ser- vices promised by Tom was to keep buyers updated of recent "finds" and changes to the listing. Well, I have received his latest listing, and it is quite a
gold mine for the individual in- terested in RTTY monitoring.
Well, this month brought Groundhog Day! Did the ground- hog poke his head out of Baudot, see his shadow, and ASCII for six more weeks of win- ter? Who can say? (Murray can!) Find out here, in RTTY Loop!
A/EIV PRODUCre
TEN-TEC 2-KW ANTENNA TUNER
Another first for Ten Tec is a new 2-kW antenna tuner/swr bridge/power meter. The new tuner uses a reversible "U' con- figuration with a silver-plated roller inductor, high-voltage vari- able capacitor, and selectable fixed capacitors for greater ver- satiffty in impedance matching. The design automatically pro- vides a low Q minimum loss path when properly adjusted. Power ratfngs are 2 kW PEP and 1 kW CW. Frequency range is 1.a^ MHz. Model 229 matches conventional 50-Ohm unbal- anced outputs of transceivers or linear amplifiers to a variety of balanced or unbalanced load impedances. Antennas such as dipolest inverted *'V"s, long ran- dom wires, windoms, beams, rhombics, mobile whips, Zepps, Hertz, and similar types can be matched. A built-in balun con- verts one antenna to a balanced configuration if desired.
The built-in swr bridge and dual-range power meter indi- cates swr from 1:1 to 5:1 and power from 10 to 2000 Watts.
Front-panel controls are vari- able capacitor with spinner knob, roller inductor with spin- ner knob, 11-position bypass/hi- lo capacitor select switch, 4-po- sition antenna selector switch, swr sensitivity, forward/reverse switch, 2000/200-Watt power range switch, and swr/power meter switch.
Bear panel Includes coax in- put connector, four coax anten- na connectors, three thumb- screw-type connectors for single wire and balanced line, ground connector, and 12-V dc input for dial lighting power.
Styling matches the Ten-Tec Omni transceiver and Hercules IJnear amplifier with black and
bronze front panel with blackout lightfng, satin-finish wrap- around aluminum bezel, black textured vinyl-clad aluminum clamshell top, and bottom with fold-down stalniess steel bail. Size:6V2"H x 12V4"Wx ISVa" D. Wt.: 9 lbs.
For full information, write Ten-Tec, Highway 411 East, Seviervilie TN 37862.
MFJ-401 AND MFJ-405 ECONO KEYER II
The MFJ-401 and MFJ-405 Econo Keyer II from MFJ Enter- prises is a new full-feature econ^ omy keyer using the Curtis 8044 10 for reliability. The MFJ-401 /405 Econo Keyer II has a much easier to use design and layout than the old Econo Keyer line. All controls are located on the front panel where they are easy to find and use.
The MFJ-401 M05 Econo Keyer fi has front-panel controls for both speed and volume. The on/off switch and auto/semi- auto switch is on the front
The MFJ-401 Econo Keyer U.
The Ten-Tec 2-kW antenna tuner.
73
panel. This switch lets you use the Econo Keyer II ]Jke a bug or it can be used to make tuning more convenient. A red LED indi- cates when the MFJ-401 /405 Econo Keyer II is on. It may be used with an internal 9-volt bat- tery or any source of 5-9 V dc. Circuitry is provided for both grid block and direct keying. This features lets the keyer work well with tube-type and solid- state rigs.
The MFJ-405 Econo Keyer II has a built-in clear lucite paddle and a jack on the back for an ex- ternal iambic paddte. The MFJ-401 does not have a built-in paddle, but all other features are
the same.
For more information, con- tact MFJ Enterprises, Inc., PO Box 494, Mississippi State MS 39762, Reader Service number 478.
LNR DOWNGONVERTER FOR SATELLITE COMMUNICATIONS
The new Model DC4-E1 is a high-performance, low-profite rf to i-f converter especially de- signed for small terminal satel- lite Earth stations. Available in single thread and redundant configurations, this unit offers low phase noise ^n^ good fre- quency stability for digital and voice carriers, such as QPSK and FM-SCPC. The DC4-E1 is compact, measuring only 1^3/4" in heightp and is designed for 19" rack mounting. Interfaces are coax connectors, so that the signal may be carried on low* cost coaxial cable. FET LNA power on the rf input connector is available as an option.
Low translation phase noise is ensured by an internal crystal* controlled phase-locked oscil- lator. Additionally, designed op- timization ensures minimal in- termodulation distortion. Each converter module is self-con- tained, including power supply. The unit is designed for unat- tended operation and has a re- motable summary alarm and front-panel monitors for key op- erating parameters, LNR is a
Magazine • February, 1982 135
■i^
leading manufacturer of tele- communications equipment for satellite Earth stations.
For more Information, please contact LNR Communications, Inc., Marketing Department, 180 Marcus Blvd., Hauppauge NY 11787. Reader Sen/^ce number 480.
NEW TOWER TRAILER
For those special situations that require communications tower mobility, Aluma Tower Co. introduces an all-steel trailer for transporting and erectmg any Aluma Tower Co. aluminum or steel tower, Ideal for Field Day, civil defense, remote signal test- ing and many other situations, the tower/trailer combination is easily towed. Once in place, the tower is tilted up and cranked in- to position. The trailer acts as a secure base.
For more information, con- tact Aluma Tower Co., 1639 Old Dixie Highway, Box 2806, Vero Beach FL 32960. Reader Sen/ice number 482.
PORTABLE RTTY/CW TERMINAL
HAL Communications Corp. is pleased to announce the new CWR685A Teiereader portable RTTY^CW terminal. Featuring compact s^ze and 12-V dc opera- tion, the CWR685A is just the thing for the traveling RTTY am- ateor who wants to "take it with him.'' A green phosphor 5" dis- play Is built into the small 12-3M" X ir'x 5" main cabi- net, as is a RTTY modem for 3 shifts, both "high" and "low" tones. The keyboard is separate and connects with a 3-foot cord to the main unit. Advanced fea- tures such as programmable HERE IS messages, type-ahead transmit buffer, and automatic transmit-receive control are in- cluded with the Telereader. The CWR685A can easily be slipped into a suitcase for a ham outing. In the home shack^ the Tele-
136 73Magazlne * FebruaryJ
m*
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The LNR frequency converter
The Aluma Tower trailer.
The HAL portable RTTY/CW termmaL
reader consumes little space and can be connected to an ex- ternal monitor and parallel ASCII printer for even more ver- satility.
For more information, con- tact HAL Communications Corp., Box 365, Urbana IL 61801. Reader Service numtjer 479.
982
SUPERCW
Frontier Enterprises has In- troduced SUPERCW, a comput' er-aided instruction program for the TRS-80 Model I or Ml micro- computer. Sound and graphics are combined to teach the user International Morse Code. By progressively increasing the
copy speed, SUPERCW brings the user to 20 words per minute in as little as 72 hours of practice.
The disk-based SUPERCW package requires a 32K, 1-disk system. Features Include ran- dom or plain text practice, sam- ple testing, and provision for multiple users. For more Infor* mation, contact Frontier Enter* prises, 3511 Gallows Road, Falls Church VA 22047, Reader Ser- vice number 483.
MOBILE HT CHARGER
Mobile amateurs can operate and recharge their hand-held radios anytime with the new HT Power-ChargerTM from Valor En- terprises. They simply insert the charger Into the lighter socket and attach the mating plug to the radio. It will charge hand- held radios in less than an hour. The HT Power-Charger is not just a dropping resistor and diode, but a pair of transistors in a variable current regulator that is self-adjusting depending on the batteries' state of charge.
Mobile amateurs will appreci- ate the convenient package— all circuitry Is enclosed In the plug With no box dangling on the cord. The HT Power-Charger features a built-in LED to in- dicate lighter socket function, with a five-foot connecting cable and plug to mate with the radio. There are six models de- signed to fit most popular ama- teur hand-held radios.
For more information, con- tact Valor Enterprises, Inc., 185 W. Hamiiton Street, West Miiton OH 45383, Reader Service number 481,
Valor Enterprises' mobile HT charger.
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m^i ■ I 1.1 I
ORBIT is the Official Journal for the Radio Amateur Satellite corporation (AMSAT), P.O. Box 27, Washington, DC 20047. Please write for application.
For a FREE SAMPLE COPY please send $1 to cover First Class Postage and handling to: Orbit, 221 Long Swamp Road, woicott, CT 06716.
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DISTRIBUTOR FOR
Aluma Tow«r • AP Products
(We have the new Hobby- BIom Syslem)
.^31
"HAL" ^^ ^- HAROLD C NOWLANO
W8ZXH
HalTronix
P.O. BOX 1101
SOUTHGATE, MICH. 48195
PHONE (313) 286-1782
t
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,^See Usr of A^¥9f timers on ptagB i 14
73 Magazine • February. t982 137
■1
CLOCKS & KITS
SEE THE WORKS CLOCK
Our Easiest Clock To Assemble
nfffrrrr:
RAodel 850
Six drglts LED clock. 12 or 24 hour formaL Attractive cfear plexigtas stand. Kit is complete including pre- cut and drilled plexiglas stand and all hardware. Size: 6" H x4-1/3" W x 3" 0
Model 850 _ , _ . _ S29,9S
Model 8S0 WT (Factory wired & tested) . . .
, $39.95
Now available with GREEN LEDs
Model GeSO . _ $39.95
Model G850WT(Factory wired & tested) . ,
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6 DIGIT CLOCK KIT
12 or 24 hour format. Six large .5"
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Model 5314 ....._,,,.._ . $29 J5
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Mod^l 2001
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Enable your digital clocks to run on DC power.
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VEHICLE INTRUSION ALARM
Easy to assemble and install, this kit offers options not normally found in other alarm systems. Hidden switch mounts under the dash. Kit has provision of sensors and remote control switch. Programmable time delays for exit, entry and alarm periods. Basic hook-up utilizes the dome light circuit activating when doors are opened. The aJarm will drive a siren or pulse horn at a 1 HZ rate. Not prone to false alarms due to reliatJle CMOS circurtry. No external switch required: Complete kit with easy to fotlow instructions and diagrams.
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^307
DEBCO ELECTRONICS
P. O. BOX 9169 DEPT. K
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Phone; (513) 531-4499
BEEPER
The Professional Touch Comes to Amateur Radiol
tiie-.- •■ ■■■■ in<MCII* Uf '4»*n. • I(m> DMp IB • r%itpLt tfr iOH ^aAe tram dui'ii^ Atit^
','aff
i-n«hwi CMOS tm^amiirt^ tsm
SP^ for «» w Of* !««' • &viLtaMft«ctc0t«nwiton 73iV ■
L
BP-SA: case, c^ble. siatidard 4-piii C&rinfrctors $39.9& pfid W*-3B; same as a&Ove* without con- nectors'.^-.-*-'.****<*'ih36.96 ppd BP-3C: circuM tioard only, lor custom Installatiaftft S29 95 ppd
Atl TTHMMt* M* Assamb^sd/tfrfitidi and csny a W day limirsd warrantY Wa ship FIRST CLA5S^INSUH£tl and m M^EPAY snapping \r\ |h« US X)«fl/af inqufftes iryiiit9C OHnio iiiftsidartt^ pisase ajjd ^^ ^l«t isx C^ack or nioney
31 48 Oorf Drive,
INC.
Dayton, Ohio 45418
Two-meter HT. Amplifier Kit
«
*^
1.5watt9 In— 20 out COR BNG in— SO 239 out smaH size: 1-3/16" x 3' x 4-1^^ Class C or ABl
ask about Oiir other UHF & VHF amplHrer kits
^459
QRO ENGINEERING
1^8 Edwartfs Ave,
LakewDod, OH 44107
(216)221 9500
APARTMENT BLUES?
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with HANDBOOK OF APARTMENT OPERATION
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POLICE CODE
138 IBMagaztne • FebruarVp 1962
MM HELP
I am in need of a schematic or Instfuction manuaf for a MARC multiband radio receiver. I wiil pay copying and mailing expenses.
Scognamiglio Vincenzo
Piazza Trieste e Trento^ 17
80046 S. Giorgio A Cremano
Naples, Itaiy
I am In need of information on the Gataxy V MK3, conversion details for an Aerotron trans- ceiver, and information on inter- facing a TRS-80 to a Model 15 printer via an M-80 interface.
Tom Van Schuyler WA2L0J
57 Needle Lane Levtttown NY 11 756
I am In need of manuals for a Gonset 3136. an Ameco 5a220^M Hz vfo, and a Seco 520 antenna tester.
Orlo Taylor WASHWM
18412 N. 148tliAve.
Spring Lake Ml 49456
I need help interfacing a DEC (Digital Equipment Ckirp.) dot matrix printer. LA-30 (1972 vin- tage), I have no schemattc or configuration info, and can't seem to shake one ioose any- where, I will pay for copFes and postage.
Stephen F. Gent WB2VKL
Berry Rd FredoniaNY 14€G3
I am in need of a service manuai or wiring diagram for a Hallicrafters S120A receiver. I wNI copy your original and return it to you.
Bill Suffich W4UUC 55 So. Carien St Mobile AL 36606
I would UkB to phone QSO with anyone into weather fax recording,
Dante Ventrier© KA4JRE
17831 NW 81 Ave.
Miami FL 33015
MILITARY SIGNAL GENERATORS
RECONDITIONED AND LAB CALIBRATED
TSr51WU RANGE lO MHZ THRU 420 MHZ AM/CW OP PULSE MODULATION. CAU- BRATED ATTENUATOR. MILITARY EQUIVALENT TO HPSOaO I ITLm
TS^inJRMjZ. RANGE 3uB TO 7 GHZ, AM/PULSE MODULATION, CALIBBATEO ATTEMUATOR, military EQUIVALENT TO Hf>6iaA 34^,00
i-fPeCfeA. RANGE 50 KHZ TH RU 50 MHZ AMiCW. G A LfBRATED ATTENtiATOft ASOOT HP6T2A, RANGE 450 TM«U tZ30 MHZ. AM/fHJLSE MODULATION. CAUfiRATED ATTENUATOR 47&ilO
HP614, RANGE 90Q THmj 2t00 MHZ AM'PUL^ MODULAnON, CAUfiRAT^O ATTfN. UATOR i4S.OO
LIRM^ RANGE 10 KHZ THftU 50 MHZ AMiCW, liOOULATlON 400 A \ KHZ, CAUBftAtlD OWTPUT. PREOStON 50 OHM STOP ATTENlJATOH jmm
URM26. RAP4GE 4 MHZ THRU 40& MHZ AM^CW MODULATION. CAUBRATED AITENUATOB iftS-W
TS497aiRR. RANGE ? MHZ THRU 90 MHZ CALf&RAT^D ATTENUATOR. AM/CW MODULATION^ MiyTA^Y VER&pON Qf MEASUREMENTS MOCtELaO ^StSM
SGtJtfU. AfRCRAFT VORrlLS. RANGE lOB THRU t3S 9 MHZ AND 329 9 TO 335 MHZ OUTPUT SIGNALS INCLUDE VOR LOC, GLIDESLOPE AND 1000 CPS SAME AS COL UNSiTgrj OPERATES FflOM 2fi VOC AT 3 1 1 AMPS BENCH POWER SUPPLY OR AlP CRA F T B ATTER lES I DEAL FO R A IflCRAFT RADIO REPAl R aW-OO
SGIA/ARN. AEflCRAFT RADIO SlG GEN WITH PP34a/ARN 1 tSVffiO HZ P/S. RANGE B8 THRU Up MHZ AND 110 1 TO lU 9 MHZ fN fO KHZ STEPS CALIBRATED OUTPUT 400/1000 HZ. MODULATION INT OR EXT, MILITARV EQUIVALENT TO BOONTON SUA
345.0O SGijMJ, RANGE 20 MHZ THRU ICM MHZ, METERED RF OUTPUT 0-5 V METERED DEVIATION 0 100 KHZ, PERFECT FOR LOW BAND FM RADIO SERVICING OR USE TO REPAIR YOUH PRC. GflC, VRC. FM RADIOS 185,00
ABOVE SIGNAL GENERATORS ARE OF EXCELLENT QUALITY, BUILT TQ MIUSPECS 0S-1g1/USM-14Q. OSCILLOSCOPE WITH MX307a^USM HO RIZ CHANNEL PLUG-I M AND MX-2g30 DUAL TRACE PLUG^IN, 5"CRT. INTERNAL SWEEP, Z4 CALIBRATED RANGES WITH SWEEP EXPANSJON, TRIGGER MOOES, CALIBRATOR, DC £2 MHZ. HOUSED IN VENTED AIR COOLED CABINET. SIZE 22' L * U'H » iS" W. A BEAUTIFUL MIUTARV OSCILLOSCOPE AT A GOOD LOW PRICE 2SS.M
T S 29/U TEL ET^PEWR ITER T EST SET 4i JM
HPSOSVHFBi^lDGE KOO
SIERRA 1268 FREQUENCY SELECTIVE VOL TMETfR " 8S.«>
HP415B STANDING WAVE INDICATOR 4$J0O
UPM-gB RADAR TEST SET liS.OO
URM32tA FREQUENCY METER 13S*< HZ THRU TOCO IIMZ S500
HP741A AC/DC 01 FEERENTIAL VOLT METER DC ST AI*DARD WSJM
FOB OTTO N.C.. 30 DAY MONEY BACK GUARANTEE WE ACCEPT MC VISA OR CHEC^t P^QNE BILL SLEP (7041 ^^-J^n
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WORK THE U.H.F. BANDS
Add a transvertcr or converter to your e?Eisiing lOm, 6m or 2[n equipments. Choose from the largest selection of modules available for DX, OSCAR, EME, ATV. TRANSVERTERS ^^^ 50^144 S234.95
MMT 144-28 $219.95 MMT 432-28 (S) S3 19.95 MMT 439-ATV $379,95 MMT 1296-144 $399.95 ^^^^ OTH E R MODELS AV AJLABLE
CONVERTERS
Choose frofn many models to suit your needs. Examples: MMC 412-2g, MMC 426/439— ATV
MMK 1296-144. MMC l2Sa^ATV Write for details and available options.
nLTERS
Preveni OSCAR 8 Mode J desense Use MMF200-7 $42.95
Slop receiver tMD birdies U-.^ PSF432 S59.95
ANTENNAS ^ ^ "
420-450 MHz J -beams 4a el. 15.7dBdS75.75 88 eL 18.5 dBd $105,50
1250^1300 MH/ loop yagi 1296-LY $49,75
Send 36C stamps for full details of all our VHF/UHF items.
Prc-selector 11 iters
Low -pass fillers
Varactor tri piers
Pre-ampJificrs
70/MBM 48
Transvertcrs
Converters
Antennas
Crystal Fillers Spectrum InteraalloiijiL Inr. Post Office Bo\ 1084S Cuncord. Musis. 01742 I SA
VfSA_
masief Charge
j^436
3
DOLLAR SAVER/SPACE SAVER
WELZ SP-300 SWR & POWER METER
1.8 to 500 MHZ/1 W to 1 KW
Will S^
Exclusive cross over frequency" range
3 Transmitter/ 3 Antenna Connectors,
One SWR/ Power for the serious amateur who operates all bands, HF
to 450 MHz
Serious Dealers Lisiing Available.
NCG
*^318
1275 N. Grove St. Anaheim* CaL 92806
(714)630-4541
NOTH: Price^ Specifications subject to change without notice and oMiualion.
J
^See^ UstQf Advertisers ^n page 114
73 Magazine • February J 982 139
Hi Pro Mk
LB'VHF-UHF REPEATERS soon to be fcc type accepted
NEW SUPERIOR RECEIVER AND TRANSMITTER SPECIFICALLY DESIGNED — NEW— FOR REPEATER SERVICE. ADJUSTABLE TRANSMITTER POWER, FROM 1
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Hi Pro RECEIVER and TRANSMITTER also available m kit form
NEW
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DESIGNED FOR REPEATER
SEflVfCEWITH EXCELLENT
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NEW
SMALL SIZE 37/8 X 6-1/8"
ADJUSTABLE POWER OUTPUT— UP TO 5 WATTS FROM THE EXCITER BOARD COOL OPERATION
THIS EXCITER ES USED TO DRIVE THE HI PRO 25 WATT POWER AMPLIFIER AND (S AVAILABLE KIT OR ASSEMBLED,
HI PRO RECEIVER
THIS RECEIVER tSTHE HEART OF THE REPEATER AND BOASTS SUPERIOR SQUELCH ACTION NEEDED FOR THIS TYPE OF SERVICE. EXCELLENT SENSITIVITY, STABILITY AND SELECTIVITY
USE THIS RECEIVER TO REPLACE THAT TROUBLESOME RECEIVER IN YOUR PRESENT REPEATER.
WRITE FOR COMPLETE SPECIFICATtONS ON OUR FULL LINE OF ACCESSORIES AND LOWER COST REPEATERS.
SMALL SIZE 3-7/8 X 6-1/8"
'46
MAGGIORE ELECTRONIC LAB.
590 SNYDER AVE
WEST CHESTER, PA. 19380
PHONE 215-436^6051
llnlv«r«Al ComnynlcjirioA*
A DIVISION OF INNOVATIVE LABS. INC.
P.O, BOX 339
ARLINGTON. TEXAS 76004-0339
SUPERVERTER I $99.95
The ultimate In converter technology! Dual-stage selec- tive preamp, mixer, i.f. ampUfler and no*drift crystal-con- trolled oscillator. We recommend this unit for experl- •nc^d kit bulldtfft. t2v Stationary Power Supply, . ,$24.95 for Suparverter L
SELECTIVE PREAMP. $44.50
This new unit Is not tike other wideband preamps. Ex- perienced kit builders can easily add this unit to our ex- isting boards or to other manufacturers' boards to im^ prove overall performance,
2300 MHZ CONVERTER KIT. ....,.,,. $35.00
Complete with PC board, parts and 10-page Instruction book.
VARIABLE POWER SUPPLY. ........ $24.95
Complete kit includes all cofnponents for working unit, including deluxe box and overlays.
DISK YAGI ANTENNA $25.00
Complete kit with PVC and mounting bracket. Stronger than loop yagi, and equal In gain.
4-FOOT DISH ANTENNA $54.95
Overall 25 dB gain. Partial assembly required. Shipped UPS (ground) only.
DL-2000 SATELLITE RECEIVER $749.95
Fully assembled receiver— this is not a kit.
1 20 * LNA $650.00
TERMS: COD, Money Order, Bank Cards (800) 433-5172 HOURS: 8:30-4:30 COST; MON-FRI (817) 265-0391
ORDERS ONLY INFORMATION
Hope to see you In Miami
Our product may be copied, but the performance Is never equalled. p q qq^ 339 ARLINGTON
^UNIVERSAL COMMUNICATIONS ^ "^°°^^»^
140 73Magazlne • FebruaryJ982
Are yoii on the verge of drowning in the flood of t^^hnieal information about computers in the marketplace? Wayne Green Inc. can help! Desktop Computing is here, and each month will explain all about computers without the "com- puterese/'
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73 Magazine • February J 982 141
MORSE
RTTY r ASCII
QUALITY AT AN AFFORDABLE PRICE
MKB-2000
Comptete set of alpltanumeric, pynctuatlon. and
specfal function keys CQ,DE.BK.KN,SK,AaAS.BT
500 character text buffer wtlh BREAK feature
10 reprogrammable 40 character message memories
M99 WPM, WelgW & Intercnar. space. Random Code
BiiMl-in 1 10 VAC power supply
Suffer/Memory fullness indicators
1 ygaf warranty on parts and labor
Attractive ano<Jlzed brushed aluminum and gray
wfinKle finish case, only 13.3 x 9.4 x 3.5 in.
BTTY/ASCII option includes— '^Brag Tape" interface.
CW ID, QBF and BY lest messages, auto CFULF and
LTR/FIG Sfiift 60.66,75.100^32 WPM Baudot 110.300 baud ASCII
Other options --Memory expansion, AFSK modulator
MVD-1000
Copies Morse Cocfe direcUy from your receiver
Automatic speed tracking with self calibration
6-60 WPM speed range
Manual speed tracking to give operator more
control
Active filters and digital sampling for increased
noise rejection
Operates with any TV 89t* no expensfve monrlor
ne^^joo
Two page display with 16 fines of 32 characters per
page
Attractive anodized brushed afumlnum and gray wrinkle
fintsli case, only 3 x 10 x 10 in,
RTTY/ASCil option Includes demodulator
MKB-20QO (Morse Qnlyj RTTY/ASCI1 Option
Send For Free rnformafion
S3td,00
50,00
MVD<1000 {Morse Only) RTTY/ ASCI I Option
S369.00 89,00
Add$5Mfi^ unit tor shipping US. A,
^OGMIelectronics, ffic,
787 BRIAR LANE, BELOIT, WISCONSIN 53511 (608) 362-0410
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ORDER HOURS: 11 am - 8 pm M-F
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Bonus: 2% Discount for Prepaid Orders fCash/er^s Check or Money Order}
vtu
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CUSHCRAFT {other antennas in stockj
A4 New Tnband Beam 10-1 5-20rn 20B,95
A3 New Tfjband Bearn 1 0-1 5-20m .1 6&.95
AV3 New 1 0-1 5-20in Verticai t . , , , 41 ,60
ARX 2B New Ringo Ranger 2m , 33.95
A32-1 9 2ni "Soomer" DX Beam 76.95
220B220 MHz Boomer' 68 95
214B Jr. Boomer 144-1 46 MHz. SI 95
214FB Jr Boomer 144.5-148 MHz.... 61.96
At4 7-11 11 Element 2m. . 34.50
TELEX HEADSETS- HEADPHONES
CI 21 0/Cl 320 Headphones 22-9S/32 95
f*ROCOM 200 Headset/dual Imp. MIC ... 77 50 Pf^OCOM 300 It/wi Headset/ dual Imp m it. 69 95
CASLE IIGS/U Foam 95% Shield 26C/h,
a w*re fiolor 2 #1 8, S #22 1 BC/fr
KLM Ar^TENNAS (other antennas in itock} iCl34A 4-Elcmenl Tribar^d Beam 320 7B
KT34XA 6'Elem«jiT Tnh^nd Beam . 469.50
144-148 13LS 2m 13' Element with feaiun 77.95
144-146 16C 2m Ig-Elemem for oscar 93,55
420-450 1442O-450 MHz 14-eiemem beam . , 37 54 420-450 1 8 C4 20-450 M Hz 1 a-e{«n eni osc*r 58 70 432 16LB1 6 elem. 430^34 hAHz beam/babn 60 70
HUSTL£R 5BTV lO-BOm VerticaJ . 92 50
4eTV I0-40m Veftic^* 73 95
3TBA Hwm 10-1 5-20tii Beam 1 88 95
HF Moliil« R«SQn0tors Standard SopttT
10 and 15 metei 7.95 12 50
30 met* r? 10.95 14 95
40 meters 12.50 17 30
75 me^i-rs 1350 27 95
Av*rni AP 151.36 2m on glass aflt . 27 95
TEN TEC SPECIALS
515 Argonaut HF XCVR . , 399
525 Argoiy HF XCVR 469
580 Dfltta HF XCVR , , . , , , 748.
546 Omni-C HF XCVR 1040,
TEN'TEC AdcessoHes III s.iin:k jii I discount prices
MFJ PRODUCTS {Calt for other MFJ ttems)
389 Nflw 3KW Tuner , .
962 1 5^W Tuner mir/swdch
949 B 300 wnX^ delude (uner, , . , .
941 C 300 wati tuner swnch/fnif
940 300 wair tuner swucii/mtr. . ,
484 Grttndrn^iifer memory kever t2 m«g
482 4 ms9 Memarv liey«r. , , , .
422 Pacesetter Kcyer w/ Bene her BY! .
408 Deluhe Keyer with speed mtt.. .
496 KeyiHiaid 11
7528 Pijal tMrnable 'filler
102 24-hOLjr clock DAIWA/MCM
CN 520yCN 540 Wati Metar*.
CNW41 8,-'CNW 5 \ 8 Anienna Tune^.
CMA 2002 Auto 2 5W Tuner ASTRON POWER SUPPLIES 0 3.8 VDQ
R57A 5 amps cor»i4nuOii«. 7 *mp ICS
RS!2A9 ampft commuDut. 12 amps ICS
RSZOA 16 afntts cortlmuouS. 20 »mps JCS
RS20M samp as RS20A + m^tefs
RS35A 25 amps eortiifiuous, 35 smp ICS
RS35M same as RS35A 4 me<ief« MINIQUAO Hai ALLIANCE HD73 Roiof CDE HAM IV ROTOR
96 00 95
00
287,
199
122
76
B9
121
87
87
69
296
76,
30
59.95/69.
169 95 .'279
399
4B
66.
87 105 131 151 t29.
91 169
75 95 00 42 70 72 96 15 69 95 42 95
95 95 95
60 35 20 50 95 95 95 95 95
VoCom Antennas/2m Amps
5/8 wave 2m hand held Ant .
2 watts in. 25 walls oui 2m Amp . . , .
200 mw in, 25 watts oui 2m Amp. .,,,,,,
2 watts in. 50 watts out 2m Amp , . .
MIRAGE AMPS & WATT METERS
MPI HF/MP2 VHF SWR/Watt Meter
B23 2 in, 30 out. All Mode
B108 10 in. 60 out. AH Mode. Pre*Amp. . .
B1016 10 in. 160 out. All Mode. Pre Amp BENCHER PADDLES Bleck/Chrome. . . 35 BUTTERNUT NEWf HF6V 10 SOm V*rnc*l
+ b b I
19.96 69.96 82.95
105.95
. . . CALL CALL . . . . CALL .. 235 95 25/42.96
SUPER SPECIALS
AEA bopole Ant-. Keyers. Code Readers . CALL
ASTRON POWER SUPPLIES VS35M 25 amp continuous ad^«t«bla. ..... 171.00
V520M 1 6 antp continuous adjustable. . . . * . 124.00
AZDEN PCS 300 handheld. 2m. 269 95.
PCS 3000 2m XCVR wdh Tone Kit , . 294 00
SAftlTEC H7120O 2m handhdd 27900
S7*7/7 440'450 handheld 284 00
MtW SANTEC 2m h 440 MHz handhelds . Call for Qyotvs
KDKFM2025A 26995
BIG DISCOUNTS
KeNWOOD. ICOM. YAESU. A20EN. KOK — Call for our quote —
HY-GAIN ANTENNAS
N£Wf TH70XX Triband &e*nft CALL
TH3MK3 3-E1emcnt Beam. 1 79 95
TH3JR 3-Elemenl Tnband. 138 95
1 SAVT/WB 10-80 Ven<cal 82 95
T4AVQ/WS 10-40 Vertical 50.77
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142 73 Magazine • February, 1982
Wayne Green Books
i:trciii0Nacs
bill Jd your
■TRS-80 IS a ifademarfc Ot
fladKj Snack Oivlsion of Tandy Cotp.
Annotated BASIC— A New Technfque for Neophytes.
BASIC programming was supposed to be simple— a beginner's programming language which was so near to English that it could be easily undefstoo<l. But, in re- cent years, BASIC has become much more powerful and therefore much more dif- ficult to read and understand. BASIC simply isn*t basic anymore.
Annotated BASfC explains the complexities of modern BASIC. It includes com- plete TRS-80' Level II BASIC programs that you can use. Each program is annotated to expfain in step-by-step fashion the workings of the program. Programs are flowcharted to assist you in following the opefational sequence. And— each chapter includes a description of the new concepts which have been introduced,
Annotated BASiC deals with the hows and whys of TRS-SO BASIC programming. How is a program put together? Why is it written that way? By observing the pro- grams and following the annotation, you can develop new techniques to use in your own programs— or modify commercial programs for your specific use.
AnnatmtKi BAStC V^lami f cofltaifvs Profectino Profiis, Sunwyof. Ttitnts to Do. Tas She^ief. IfHroducfion to Digaai LoQic Cameloi, The S<mmleit Code. Dedi*ctKm, Op Amp, Contraetof Cost Esiimaiing, (avatlalite November) BK73a4 S10.9S ISSN 0«d006^02S-X
Annoistmi BASIC Vo/uma 2 coniains Rougti Lumber U%t Trip Mileage. FH^ght Ran, OSCAR Data, SWWAmefina Design. Supemia^e. Petals Around llTe Ros«, Nume/c Analysis. Demons. Air Raid, Geography Test P1iumb*ng System Design, (available February) 8K7385 Si 0.9$ iSSN 0>^00&037^9
Order Both Volumes and Sawe! BK738402 $18.95
Kilobaud Klassroom—
A practical course in digital electronics
by George Young and Peter Stark
Learning electronics theory without practice isn't easy. And it's no fun to build an electronics project that you can*t use. Kilobaud Ktassroom, the popuiar series first published in Kifobaud Microcomputing, combines theory with practice. This tsapracti- caf course in digital electronics. It starts out with very si m pie electronics projects, and by the end of the course, you'll construct your own working microcomputer! Authors Young and Sta/k are experienced teachers, and their approach is simple and direct. Whether youVe learning at home or in the classroom, this book pro* vides you with a solid background In electronics— and you'll own a computer that you built yourselfl
Kilobaud Klassroom contains Getting the Ball Rolling, Gates and FIJp-Flops Explained^ J.K. Flip'Flops and ClocKed Logic, PC Boards and Power Supplies, Hardware Logical Functions. Voltage, Current and Power Sup- plies. Transistors, Diodes and OP Amps, Pufeses and Mof© Putses, Counters and Registers, Bus Traffic Con- trol, ROM and RAM Memories, I/O Circuluy, Para^le1 and Serial I/O Ports, Computer 1^0 lU, Computer I/O W, Computer I/O V, Processor Connections. Finally. , .The Kilobaud Krescendo, Eproms and Troubleshooting, ^Kpansions and Programming, Machine-Language Programming^ AB^embly-Language Programming, Con- necting to the Outside World. ... ^ ^,s^~mj^^^ ^^ M ^^
ISSN 0^8006027 1 (available December) BK7386 $14.95
The New Weather Satellite Handbook
By Dr. Ralph E Taggart WB8DQT
Here is the completely updated and revised edition of the best-selling Weather Sateiflte Handbook— containing all the information on the most sophisticated spacecraft now in orbit. Dr Taggart has written this book to serve both the ex- perienced amateur satellrte enthusiast and the newcomer. The book is an Introduce tion to satellite watching that tells you how to construct a complete and highly effec- tive ground station. Not just ideas, but solid hardware designs and all the instruc- tions necessary to operate the equipment are included. An entire chapter is devoted to microcomputers and the Weather Satettite Station. And for the thousands of ex- perimenters who are operating stations, The New Weather Sateftite Handbook details all the procedures necessary to foitow the current spacecraft.
Weather Saieilite contain* Otserational Saleltde Syatema, Antenna Systems. Weaihef Satellite Recewef^, A Cathcjde Ray Tube (CITTl Monitof fof Satellite Pictufe 0i5|»l*y. A Dir^ci Pfinting Facsimile System for Weather Saleltite Display. Ho* to Find trie Satellite^ Test Eqitlpmofit. MicrocompulefS atnS ttw Weattief Satellite Station,
siation op«aiions. is8N aaflooMiM available HOW ! BK7383$8.95
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GENERAL LICENSE STUDY GUIDE
by Timothy M. Daniel N8RK
This is the complete guide to the General License.
Learning ratlier than memorizing is the secret. This
Is not a question-and-answer guide that will gather
dust when the FCC issues a new test, instead, this
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ham upgrades to General, includes up4o-date FCC
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144 73Magazine • February, 1982
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73 Magazine • February, 1982 145
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140 73 Magazine • February. 1982
THE AUTEK "QRM ELIMINATOR"
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Built-in 115 VAC supply. 6V2x5x2Vi. Two-tone grey styling Even latest rigs include or\ly a fraction ot ihe QF-1A sel-ectivrty Yet il hooks up in minutes to ANY ri^-Yaesu, Kenwood, Drake, Swan, Atlas, Tempo, Heath, CoH"ir>s, Ten- Tec, etc, Just plug i1 into your phone jack and connect spki. Of phones lo the oulpuL Join the thousands &f owners who now t>ear stations ihey couldn'l copy without a OF-1A! Il really works!
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EAST COAST #1 GOES NATIONAL
THE ANTENNA BANK is East Coast's #1 supplier of
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A3 Nevi^ El^rn^nt Tnbiand Beam „.. 5165.00
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AVANTiAPTSl.3G Glass Mount.. S 27.95
W2AU Saluo ' — "'"S:17.55 Lisl^SaJe £ 13-35
Traps 10. 15. 20or40flri--— — -S24.95Lisl^Saae S 16.79
VAN GORDON:
PD BOlO I0-a0m Ware Dipole S 26.80
PD40miO-40TnWFfeDipOJe. . S 25.20
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TSMagazine • February, 1982 147
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148 73 Magazine ■ February, 1982
Introducing
*'21
YOUR OWN AUTOPATCH FOR OPERATION
Mobile Connection
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• SMALL SIZE- (5" tc 6" x 2")
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BRCVID B/4ND FOLDB> DIPOLE
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^ 11
B & W's Broad Band Folded Dipole covers all amateur bands including the new 12. 17, and 30 meter bands. Also covers CAP frequencies, MARS, Military or any frequency from 3.5-30 MHz- Being used ttirougtiout the world! Total length only 90 feet long— spreader spacing 19 inches. SWR— less than 2:1 from 3,5-30 MHz. Rugged construction for long life. Can be installed as a flat top- inverted "V" or sloper. Also available for 2-22 MHz. Power handling capability 2 KW-4 KW PER Supplied completely assembled with RG 8 type cable with SO- 239 connector Terminated with PL-259 connector on each end. Patent Pending.
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Barker & Wiltiamson, Inc:
10 Canal Street
Bristol Pa. 19007
Phone #215-73a-5581
BW
MHtwCCII«d
Hidn in the palm tjT yw hand Bf!;*5]C,i>n (iiian^ Esar rijnj FM facfioor r*cei^€i .
QUARTER-MILE WIRELESS MICROPHONE & RECEIVER SYSTEM
hue dhUWiKa'vil liV^I'i' :.Ll-Mllllll'Hi
wirplfc»trti>^!t'& TNli*iV'i< ^11
IjialUtry l)n^l.;«(QII. CiHCtl-Fl M 11 Ih
FACTORY SURPLUS VHF / UHF TWIN" VARACTOR TUNERS!
S27 SO
Bff A^Cl -hJEi^' UiriiH! I in liiiMih"^! r,r k4<|ig> I i iv^ i;i|'rlhiiiin.;tHly liiliinl TV f^MNl f ';r- ■ ■' iijiiil ([I 'I'll I irftm ^|.M ^^ ptii fli
Nst ssdvcaoa
DUmnnGS NORELCO ENDL£SS LaOPCASS£TTES<
5f34.g€
I mposiiale to Krifl it ahv prji^e!
e iflinutBl - No 354VA6a$.
Ty5^
£SS!
m STOCK - THE MURA CORDLESS TELEPHONE SYSTEM I
..I I...?.- 1 ^ ■;■■ i:m III '■ ^^Mt V¥«in I 111', vr.--
leu pacAi^'ptMiif 400 ft rriB*' flA
niim^ci '<;r,^ii ^.jij- 'IH iri^lillKi Uut;^Ar:l*- ■riJi','. i.-'ji-Cf'tvirj-ro-
Mo. a^VAllA
SALE Of QUARTZ BATTERY- OPERATED CLOCK MOVEMENTS?
£\ p icr-jiacv :-' f iV.i • .irM ii|i
r ^ jiiui "f! ' im;II ItriliuiiH"! 'rwn Sa.e& '^^JiKi Gfe^ri^-sv Wo 3&aVft531 ^
*•' '' 1"^VA565 Wl<chni^ H«Mft ^A^iifU.
88
S12*.*i
311 AMF» REGULATED 12VDC POWER SUPf L V f
"■ 3g4tfAa95 aa fllj^^<. TS H>"R«
n tt ,1^ II MiY <• I^LI I ? 5 .41L Ik.ll
H)#!l %t^:.\t i'a\'iiMe' liiiitl.iTff'ifii" rixii I lie :Hli(l. SSB I " i^i J ■ ' -4130^ PEP -Br^ixf fte-ir ■ : - s^viiipi I r r?'i V AC. Hij 11^4 VA ;-ni'i
i:ii B
OUR LATEST ^ PACE F ASC IN A TlfttG CATALOG
■ I-
\mitAum'4ii I"
EtCO ELECTRONICS
NOflTN COUNTfiy 5H0PP<NG CENTER
fl-ATTSBURGH. N V 12401
Ch9(* wnti o«ihi. pteaw Vis** IWfliwfcaiu O-K •!;So<iri '"S C 0 Cf * Ana tSi for UP3 f^ HandMfni(i:Jie*+rrn1iiiiiiodi Sj.V Sl-ii^ rfliidums iflri ? TB|H^ [hi OwaUp Bi iKptjuP inquirmi .ii»ilHi1. Oyi ii.'l*jj|i,unr utik-r ilMt \in<(nt diihij
r
copy RTTY, ASCII
and Morse from the palm of your hand.
Have you waited to get into code reading until you found out what this latest fad was about? You can stop waiting, because it's no longer a fad.
Amateurs everywnere are tossing the gigantic clanking monsters of yester- year that once performed the job of reading radloteletvpe. They are trad- ing them in for state-of-the- art code^readlng devices that are incredibly small, noiseless if desired and in- finitely more versatile than their antique predecessors.
Kantronics, the leader in code-reading development, has just introduced the latest and most-advanced break- through in the copying of Morse code, radioteietype and ASCII computer langu- age.
The Kantronlcs Mini- Reader reads all three types of code, displays code speed, keeps a 24-hour clock, acts as a radioteietype demodulator and reads all of its decoded information out on a travel- ing display of 10 easy'to-read characters, it is so compact that it fits in a hand*held, caicuiator^size enclosure.
At S289.95, the Mini -Read- er outperforms anything within another S400 of its price range.
Call or vrslt your Authoriz- ed Kantronjcs Oeater now to find out what the latest in technology has done to code-reading.
I Kantronlcs
(91 3) 842-7745
1202 E. 23rcl Street Lawrence. Kansas 66044
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I
r
W^BW^i^BpBp
IMPROVE YOUR NORSE SKILLS
WITH THE
MODEL KT-1 KEYER TRAINER
FEATURES INCLUDE:
• PRECISE SPEED CONTROL
• 24,000 CHARACTER PSEUDO-RANDOM LOOP WITH 10 STARTING POINTS AND FREE ANSWER BOOK
• EXCLUSIVE AUTOMATIC SPEED INCREASE
• RANDOM PRACTICE MODE
• OPERATES FROM 12VDC
call or visit
AEA
Brings you the Breakthrough!
DERRICK ELECTRONICS 714 West Kenosha Broken Arrow, OK 74012
TOLL FRFEE (800) 331-3688
USERS IT'S
^0
M^ ENGINEERINGS' NEW
HANDI-CON V
^''tft
Are
HJieiQ wo? IHtl
•ANY FULLY SYNTHESIZED 2 METER H T CAN NOW BE A COMPLETELY
PORTABLE VHF-hi MONITOR •2400 CHANNEL CAPABILITY •DOUBLE BAND COVERAGE
154 -ISSMhz fire,police,sheriff,
paging & more 159 - 163 Mhz maritime coastal ,
railroads. N.O^A. weather & more •MULTI-BAND & MULTI -CHANNELLED
MONITORING WITH SCANNfNG H T/s •SINGLE 3-POSITlON CONTROL
• "OFF RETURNS TO NORMAL TRANS-
CEIVER OPERATION
• LOW LOSS COUPLING TO ANTENNA
• UP TO 6 MOS OPERATION UNDER AVG.
USE WITH A SINGLE AAA CELL
• Bl -LATERAL PROTECTION AGAINST
ACCrOENTAL TRANSMISSION FOR UP TO 5 WATTS
• size 2 25 5t 1 5 xT4 inches
• wejght - 4.5 ozs.
$44.95
+ S2.50 pstg. &hndl9. in Calif, add S% s.tx.
L
I I
J
contact
p^n
M SQUARED ENG. 1446 Lansing ave, San Jose.Cal 95118
' Of -
Ph 40d'266 9214
Pfease write for cfyb discounts on quantity orders
150 73Magaiine • February J982
look here
call toll free:njghts 1-800-231-3057
6-10 PM CL M.W.F. days 1-713 658-0268
ICOM IC 3AT/IC 4AT 269 00 ea
IC 25A 309.00
IC 730 729 00
IC 2AT 249.00
IC 22U 269 00
Santec HT 1200 269.00
ST 144UP 299.00
1 0% OH Ust on Stock Items
Tel rex Drake
» « P -M «■
^ * *
, . 995 00 . 1 299 00 ,,169 00 .,11500
. 1 00 ea
Call
24 95
749 00
67500
.699 00
.159 00
TR5 . , . . R7/DR7 AEA Morsematic. CK1 Contest
MBA'RO Reader . . . 269.00
Order KWM380.. $3095 00
Si 2 Free Frtters
High Serial Numbers, All Mods
Ampheno! Silverpfate
PL259
Antique rare Tutjes
TJm«x 24 Hour Wallclock
Robot 800A ......
400
HalC!2100
KB2100
New CWR 685 A Telereader .875 00
Cubic 103 1195 00
Bird 43, Slugs Stock
Drake Theta 7000 995 00
Belden 9405 Heavy Duty Rotor
Cable 2#16, 6#18 45C/ft,
Belden 8214 RG S Foam . . . 36C/ft
Belden 9258 RGSx Min(-Coax19C fi
Belden 8267 RG 213
Non Contam Jacket 43C tl
AlHance HD73 109 95
Large Bookstore
10% OH Curtis, Sherwood: Palomar
Call Quotes Kenwood TS830S,
TS530S. TS13DS, New
We Want Special Orders^
Yaesu Specials New FTI
FT 707 . . ,
FT 101ZD Mark 3 FT 208R
MASTtRCAftD VISA All prices fob Houston «Hc«pr wfiere imjicated Prices subjecl lo tf^an^e wiT^oui noifce. all nemsguaranieed Some Items sub|9Ct pnqr sa\v Texas res4<^nt5 ddd 6% idi Pi«fts# add suHtci^m pf7$ia^, balance cnlfieet
2395 00 649 00 749 00
289 00
Electronics Supply
"« 1508McKinney Houston, Texas 77010
Lacue Likes You . . . and you'll like Lacue
WIRE AND CABLE
^ G-2 t 3l ir r — ■■— ■■ ^jTZft/f 1
RG*U roam 95% stii«l« . — 23 St/*1
^ G-BX foam 95 % %hmtQ — 1 1«Ht
RG SaCflJ m,l spec — tleih
R G Sd mt3 spec ^ ^ ^ Bull
RG T % — iSWfl
i 50 ohm Taddcc I me 1 00 »T roil- SIQ 2S
B-Cortductw Hoior Caoie — — iStrtT
t<G* Stranded Coppe'iM'f muiiiplesl- Ttlft
tlGa &o<HdGoppemeidiSOil mufltplcs) 7tlft
tJGa Solid Cop p«f weld (50 f( ms»llip(#«— — Strft SGa SoikdAmminum 15011 muU^plMSi" — ^ — -^ — tttltl
ANTENNA ACCESSORIES
Ceramic Insu^aiors - . iii i- 45* ea
A mp heno I PL- 259 - - ■«im»».i»wi — — — -75* ea
Van Gorderk" — ._,„,_„_„„,g|,|yn,.. 17 50
C*rtle^ lr^»U^ ■^-*— -1 — %A 60
W2AU B3fun i 1 or I 1 ^... $13 25
B4W Traps 40 Thru tO -'" -■ '—tfi 65 per pair
8&W Traps 80 thtu IG- -—'■■'-'•"-'■"■■- $25 65 per pair
ROTORS
CDE HAM 4 — " .„...,.™.^-_ tlS2 95
CDE CD 45^-.^-™" -^ —'■ — S B9 55
CDE AR Z2 " * 48 95
1962 CALLBOOKS
us. version .$14.95
O'X vfifSion — . $14.05
ALSO AVAILABLE
Cusftcrad. Hy-Gain f^l^i Bencher Bullernui i%egenc)r
Mint Prod ucls.tarH»'n SAvy Huflle'r Shure ARHLStrd.
CaltbQDli Affieco Sams f^j&iicalions FU>nfi Vibf<rpiei
Ham Key. Vocpm Dnwa arnl manr more
Pffcea S4jb|ecl lo ch#r*ge *k!hou1 nor»ce
Hours Mofi — Sal 1 0AM — 6PM Tum% * Pn tiJ 3PM
Teiephorte rei4iS3fr^500
mOJE COMMUNICATIONS ELECmOMCS
fOl Vlkir Sinn ^
Jol«towii. PA i^fn
SMP 2300 MHz
Now Order Toll Free! 1-8QO-368-3028
pfTC nn*'^
Ty,S— 44.95. Deluie Tunable PS. Very smootti tijniing MIL SPEC pat S-ISV Complete,
UCC-1— 35.00
2100-2500 MHz components
DownconveHer Kit.
Quality board and
SMC-2^50.00. Deluxe downconverler
kit. Wiiti tiigh gam RF franststor and lemperature compensation
ft FA-1— 44.95 2 stage RF preamp. Selective filter 16 db nei gain.
large SASE brings catalog ot kits and parts and the 2300 MHz slory
Aii prices postpaid m U S. VISA and MC accepted In Vtrgfnfa. AEaska and Hawaii Calf 703-255-2918,
,^376
SMP
U
Superior Microwave Products, Inc.
P.O. Box 1241
Vienna. Virginia 22180
INTRODUCING THE
CES 500SA
SIMPLEX
AUTOPATCH
The First Affordable Private Phone Patch
As dtscribed In 73 Magazine. fi/SI.
Now. for the first time! Every amateur operator car) enjoy ttie urjparalletied freedom of a private ptione patch m an economicai package.
The dramatic new CES 500SA Autopatch is alt the eQUipment you need to patch an FM base station to your home or other telephone line, without expensive fepeaters. cavities, or other equipment Cctfifiections with any standard FM base station are rapid and simpte.
Bypass the congestion and expense of shared repeaters — break through lo greater privacy and convernence with ttie new CES 500SA Autof^ch.
COHEREI^E IN COMMUNICATIONS TECHNOLOGY
CES
COMMUNICATIOHS ELECTRONICS SPECIALTIES, Inc.
PO, Box 507
Winter Park, Florida 32790
Telephone: (305) 645-0474
^462
See Lnl Qf Advertisers on page ii4
73 Magazine • February. 1982 151
rfb
MHz MICROWAVE DOWNCONVERTERS
DOWNCONVERTER
Kit
Assembled
2300 MHz PREAMP
Kjl
POWER SUPPLY
Assembled. . .
¥ T •
.... $28.50
$48.50
. $25.00
$35.00
2300 MHz ANTENNA
w w >&■
SATELLITE TV EARTH STATION
• 24 Channel Receiver
• 10' Antenna
• Dexcel 120° LNA Call for details and price
Also AvaHable: Connnnercial System with Bogner Antenna .............. $169.00
/
WITH BOX FOR DOWN- CONVERTER
$27.50
PB RADIO SERVICE
1950 E. PARK ROW • ARLINGTON, TX 76010
t^ 404
CALL ORDER DEPT. TOLL FREE
(800)433-5169
FOR INFORMATION CALL
(817)460-7071
RTTY/C\A/
A Trajdemark or the Tandy Corp
R0MH6
RTTY/CW Operating System
Detailed brochure available on reQuest
Featuring:
1200 BAUD OPERATION. Not limited to 1 10 baud be- cause ot timmg loops. 60. 66. 75 & 100 W.P.M. Plus 110. 150, 300. 600 & 1200 baud operations possible
FLEXABIUTY OF DPERATIOH. Instantly change: Baud Rates: Program Mode (ASCII/baudoi}. Program Status SPLIT SCREEN VIDEO. Transmit & receive data dis- played separately
HEAL TIME, Automatic CW/ID without user interven- tion. Aylomatically updates \^^^ at end ol month or year ^^S CROfdCI
nicroPiodiicts
Other features include i
• Two Serial Ports Fourteen Buffers AuiomaticCWID Transmit Control
• Selective Call Feature
• Error Corf eclioti
• Wora Wrapping
• Easy To Interlace
• 30 Day Unconditional Guarantee
• Hardware requirements. TRS-SO
Model tor 3 16K Exif rnal termmat unit.
606 Slate Slreet. P.O Box 892-R • Marysvdle. WA 98270 • (206) 659-4279
BASSETT HEUUM MOBILE ANTENNAS
For
Commercial, Amataiift and Government Services
Rugged, low drag, high efficiency mobile antennas engineered to maintain resonance at all times.
Maximum overall height of qnty 70'. Averaoe weight of only 6 oz. They remain vertical ai all ^seeds.
Hetical inductors sealed in helium filled Fi&erglass imperviousloaH weaihef. Adjust able i7-7ph whips and solid brass hardware chrome plated and polished.
Optimum gain colllnears for VHF and UHF. Unrty gain models for HF, Amateur band models are mveri- toried for "off the sheff delivery. Commercials to S|>ec3.
Write or phone for free brochure and prices on Bassett mobiles and Helium Trap Antenna Systems.
REX BASSETT
ELECTRONICS, INC.
1633NE14thAve..Btdg. 11 Fi, Lauderdale. Fla 33305 Tel: 305/561-1400
-iho
ace N, Mitn Evans vlllfl J N 47711
TENTEC
546 OmnhCXcvr $1050
580 Delta 750
525 Argosy ^BQ
280 Power Supply 150
255 Power Supply/Speaker 1 70
243 VFOOrnni 169
283 VFO Delta 169
234 Speech Processor 125
ST-144/;aP
SANTEC
call
AEA MBA Reader 275
ALLIANCE HD73Rolalor 99
AZDEN PCS-SOO 2m Hand HeW call
CUBIC Astro 103 1175
DAlWACN5lB2,5KWTunef 255
HAL CT 2 100 call
HY-GA!NTH7Tn band Ant. call
1COM25A 2m Mobile 309
ICOM 251 A 2m All Mode 625
KANTRONICS miniReader Package 259
lVlFJ496Kevboard 290
MFJ 722 Notch/CW/SSS Filter 59
MIRAGE B3016 2Tn Amplifier 206
812-422-0231 -*«
mU-f^l 9AM^6PM • SAT 9ilW-3PM
jflff'tm tOF (Jut nf * ^ififl uSiPC v
J
SYNTHESIZED
SIGNAL GENERATOR
MADE IN USA
MODEL SG TOdC
• Cowers 100 !o 179 999 WH/ ifi i kHz steps with ihumtt wtteel diaf • Accoiacy 00001% al all fre- quencies • iniemai ffCfluBncy mocfulation from 0 to over 100 kHz at a 1 ft Hz ra!e • Spurs anif nctse af least 60ilB below carrier • RF ourpyt adjustable from 5 SOOinV across SO ohms • Operates on t2vdc # Vt amp In stock tor immecfiaie shippiirg $3?9 95 plus shipping Overnighi delivery avaH^bts a! extra COS! • Range txtender (phase-focked mix&r/divid- eri lor above unit Extends Hie range Irom 1 to 580 MK? Same size as SG-100 Mounts piggyback f I e 1299 95
*^311
VANGUARD LABS
imr2^ J»m«cia Av».. Hollit, NY 11423
CB. TO 1 0 METER KITS
AMElfCA*S # f SOUICi FOl FM — SSB — AM
IN STOCK— Kits for rrroM C.B. Modeb
NiW— 1 0-meter FM DiscriminatoT Board
—fits most PLL rigs. Kit— Assembled and
rested.
NiW AND USID— FM S. SSB converted
C B.s now In Mock — from SQO,
LOW COST— Prices range from SlO
to S50.
ORDER lY PMONi— f6l7> 771 46B4
VISA 1 MASTERCARD— accepted
IREE CAT AlOO— write or call todayf
AMERICAN ClYSTAl iUrPLV COMPANY P.O. iOK 61S
WEST YARMOUTH, MA. 0267 J («17)77I'4«S4 ^^
CB TO TEN METER CONVERSION KITS
KITSforAM— SSB — FM 40 Channel PLL chassis conversions DETAILED rNSTRUCTIONS for easy In- stallation with minimum time and equip- ment
BAND COVERAGE ftexibillty provides up to 1 MHz coverage for most PLL chassis,
PHfCES Low cost prices range from Sa.OO to $50.tX)
All kits are in stock including several different FM kits, FREE CATALOG Write or call today.
-^TB INDEPENDENT CRYSTAL SUPPLY COMPANY
P.O. Box 183
Sandwich, Ma. 02563*0183 (61 7) 888-4302
THE PROFESSIONAL
TOUCH TONE
ENCODER
' ^^^ ^^ An urtra high qyallty
encoder for professional application. Absolute refi ability and function makes the difference. There s a Pfpo encoder for every system and application. Totally sarviceabte, easy to opermXe and Instalf. Ca// or write tor free catalog and informatsoni (213) 652-1515 or P.O. Box 3435. Hollywood. CA 90028,
PATENTED - A TAT
^ipocgommunications
Emptia$t& ts on Ousiity & Rensbtisry *^ 300
AMP LETTER
imp LET TERJ f». put^Hcacfon devot t i an f a R^ opera 1 1
? . A rrewsl et tsr t
you IT next ampl 1 f1
The mp'llllin \l Clflin ev^ry three It i i orgflfiized I'
1 Cdf tor's Corn
il Letters
1 1 [ J^tn Topics i
IV Feature ArtU
t AWP-LETTER |R
I , An Anateur R»d{<i
ed tD th? d^itgn, ci>nstruc-
on nf Amateur jjn jj^ i" f f e r 5 .
hat can save ^^u mprty tjti (jf constrirctlon project. rt% and information.
pubMjhed and mafled Ftrst weeks (17 t ilne^/jreir) . 13 to rive depir imtti'lLS -
Hive pif Is to se^ 1 7 Run mil id in the *IIP-lftTEft TRIDEft. Subvert titr rate \% l^t p*^ (word.
Tfie AKP*LETTEFr believes that hOfttbrewfug ^n antp can be fvif^i ^ducat 1 dPta 1 * and hdlf t% costly as buying i co^fperdal amp^
A ore year subscript tQti to the AHP-LETTEfi i5 JlB.OO/year (1? issues). Mention "73" Napaf7fne and >ou i!ia> subscribe it the spiclat one time rate of SlS.DQ/year
mH*J m\%^ A SINCLC ISSUE OF
AHP-LITTEIt RR? tox I9A T**cnnpso"iif ^ Tie
^ 97
THE
a«p-le:up
Place An ad, ICC/norrf
Send l^.QO For ■ ^inple c for « fgH year of t
or StS.OC
I
PILOTS :
^ ^
I
ThB RST-*42B voice actuated inter- com iS59 50i ts tust one of o^er 20 exctfing avtonics kits from Radio Systems Techftology. Test gear too*
FREE CATALOG
Caif folf free outside Ca/^/om/a
e24B97e *
OTHERWISE ■
ate ->. J
2722203 /
k
Radio Systems Technology, Inc.
-~«a£afeG-«flASS VALLEY AVE GRASS VALLEV. CA 959i5
QUAUrr MICROWAVE SYSTEMS
2100 TO 2600 MHz ANTENNAS MINIMUM 34 db GAIN OR GREATER
Complete Sy&tem ai pictured $149.95
(6 month warranty) Down Converter (Probe Wnld-J
wsembifrd Ir leiled $59 §5
Down Convertef (Chassti Itlnd.)
assembled A lesled %S9^S
Powef Supply, aiiembled ft teifed $4S.9$ Down Converter PC board.
with pans, unasMmbled A Data $39.95 Data Information (Plans) 19.95
Send cash, cheek ~ or money order to:
Phillips-Tech
Bectronics
Dept SP-73 ,>H.42i P.O. Box 33205 Phoenii, Arizona 85067
for tp^clat qusnttfy
pricing. CCD/t,
Mmterct^arg0,
ana ViSA calt:
{6021 274-2885
FINALLY. . .
A SQUARE DEAL
ON YOUR
ELECTRONIC
SCRAP
il/rtnv "hrffkftv' pay flat rutv% nn ni'ffip, not payment tm fhe value Gfyourmattriat.All mai**rml sp^i/ tn uh m mdwifiuftny rvfinvd and iimayf'dfor mtixtmum retitrn Takf a. htok at urtmi" fypiraf ywifh
PC Boards Connectttr* PC Fingrrv Gold fHOttd pin^
SOC to$7ftt^rfh. $l2i**$5npfrlh
Far further mfttrmalton, ctrvtt itur frader serriae nttm hfr or catthtrtrr
/r^%.
^^Q
ELECmomC REC YCLERS OFMAmjNC
263A S. Main Strret. Box €
Middieion, Mum 01949
TnU Free fSOO^ 343-8308
In Mass, (HI 7) 7770455
WEVE GOME NATIONAL
Strux Corporation manufactures and distributes National Radio, Inc. Com- ponents: Chokes, inductors, coils, and hardware. We also distribute fixed and roller inductors, contactors, mU-spec and designer knobs. For all your elec- tronic needs, contact Strux Corpora- lion. 100 East Montauk Highway, Lindenhurst, New York 11757,
ISTXUXl
CORPORATION
100 EAST MONTAUK HIGHWAY LINDENHURST. NEW YORK 11757
S** LfSf of Aitvmrfts^fs on psg^ f f *
73 Magazine • February, 1982 153
If s Incredible!
/
OD£.qui!c«c
Now You Can Master Code * • .
For your fif si ham license ch yp^rad? m 4 maftwofdays CODE QUICK 1^ a fi^K>{Ll
iionary bneAkihrougK cbscowry which dr^s ttcalty sifnplrfies the Naming ol Morse Code Oort'r torture vourseH wilh an pndWss rmue g| diis and dahs With CODE QUICK each tetter magHiaUy calb out its own nanw* Your amazirYg kit Lon tains S power park^ c*5 &pttes. visual breakthnxigli carafe, and nrig inal manual s^ridSl?^ today to
WHEELER APPLIED RESEARCH LAB
PO Box -1261 Cnv of hdustry, CA 91744
Ask for CODE QUICK ftl03
(C^lif add 6'm salps T^n.t
Even if you have failed b*?foTe CODE
QUICK must work for you or return
the l<3t for total immedtal^ refund!
DiREcnon
FINDBHG?
New Technology (patent pending) con- verts any "^H^ FM receiver into a modern Doppler Radio Direction Finder. No receiver mods required. See June 1981 issue of 73 for technical description. Kits available from $245. Write for lull details and prices.
I DOPPLER SYSTEMS /^ 5540 E, Charter Oak Ly Scott^dale, Arizona 85254 \ (602) 998-1 151 ^425
m
GO MOBILE WITH YOUR H.TJ
^
NOW FOR FT-208R & TR-2500
*^ unique battttry etirtimitof *
HANOI-TEK ReQui^tof allows centtani h«n^l>«ld
operation Uom auto OC or biM supply witi^ no ni-
ctd drain «r>d WITHOUT RAD»0 MODIFICATION!
Modvl I— Icom 10-2 AH; K— TR 2400; N~FT-20flR
Y— FT'207R, T— Simp!* mod ^Of Temp
124.95 PPO In USA. CA add Si 50.
*^460
HANDITEK
P,0. iOX 2»$, LA PUENTE. CA >ir4i
Icom—s lidos on bottom of rtd'o Vaiflu^hts into t^ativry compartmttn'l Kenwood— povtrefed tt^ru batta^y plug
C:ERTIIIFJ} INTl-RN \rKI\AL
"rajHULL BE tti_AD ¥ouc»ecped BfiTM MI rim
QtfHCRMFT AMD mJET^ER fMl hh* n ?fi% of l] . LARSEN,
FALOMAft. NtE VIKIHG. TlllOifVK, TUAC JAIff L •EMCHER. VlBflOTLEJC AlM4£l«OL GOULD ttCiLEN. EVIIIEAJ^Y AND 0THERS
we IFOCK EVBTTKINDOF WiRE TME AMATf UH f«E£IK BY 9EIL0EK Q^^Pi
CRTtTAU F13ESM CUT TO TpOH ORDtR tftCW HJ6
QSL'i. CUSTOM Hhm, lOE VOtJ
Ol TO 10 INEftn COIfVF^IOiyS FRCiM the STil.f«pA1IEl STTTEfl
CERTIFIED COMMUNICATIOIMS
j^a^l Wf COM ^EflT OVER 1 WliRODELSlil^ ANP U^ ^^""^ AMD SELL NEW 10 METER flIGSWFTftOOyBLf WARRAMTY F RDM Si 76 00
Al(t fOA 4WCFTE, I:ATALDG, CON trE AilQ«4 flDOKUirr. OIL UUPLES 4IMCLUDE 549 BnnJ. OH PNFDAMAr»Of«,
WE BHfNO OUR STORE TO VOU AT OVER 70 HAMFESTB PER VfAR. set VOU IN SOUTH BEMP< AH LIWGTOJ^ H EIGHTS AND WiST ALLIE
TS WOfffH 1^Di/l? tW^tf TO CALL Oi» Wfl/ Tf
4141 ii»umf«Trfl, 141*1 aj**5it *liwi»ii>il W( 4MTJ
fHEHMRiri_
MICROWAVE RECEIVER SYSTEM
24* dfl GAIN * TUiASU Zl TO 36 &Kz RAIIGE
i nOilll WAMMTT • CPiniTlirEADr TO IM&T All
PIRTS OF HMR H AVAlUMi SEFAHATaf
|
t |
$139S^ACM |
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SEND CHECK MONEY ORDER 01^ CERTIFIED fUNDSTO HMR POeOX440fi5a* AUt^OflA COLORADO aD(H4 DEPT MB |
fOflTHE LOWEST PHICE ON QUAMTITTOHDEItS. COD». MC OR VISA ORDdlS CALL
^9 QOat 620-0736
FOR THE DO'lT-YDURSELFEfl
DOWN CONVERTERS
PC0 PJIRTSAFUHS W
PLANS
POWER SUPPl*
WITH CI an:^
PCa PARTS CiSf 4 PLUNSaq tail
S-LINE OWNERS
ENHAMCE YOUR INVESTMENT
with
TUBESTERS
TM
Plug- in. soltd it^e lube rcptscmnenti
• S'tine perform a tiee—iot id stattt * Heat dissipation r^cfiio^ 60% • Goodbye Nard-to-f ind tubes • Unlitnited equipment life
TUBESTERS cost Jess than two tubes, and are guarantBed for so long ^% you own VOurS-IJne,
1^433
^■^^^^^ Write or phone for
Box 535 jpecs and prices.
Talmage, CA 95481 (707) 462 6S82
You can pay more — But you can't get more!
RtodeMLiieK $839
Model III 4dK I disc 8e RS232C
$2100
immrn^
Color Computer 4K
$310
w/l6KExt Basic
$459
BUY DIRECT These are jus! a law d1 our great oflers which include Printers, Mudsms. Com- puters, Peripherals, Disc Drives, Software and more, c^ii toll free 1<OOIM4S^812«
Wb have the lowest ^ 444 possible fuHy WMTantBDi} prices ^' mtf I luH complement ^reecaraloq *a Ml **. iTr. t» 245A Gfeai Rood
Ol Radio Shack Software. Litne^on. MA 01*40
617 • 466 * 319 J
comp^fBT
te for your WiUS^
O
o o
Q O
S
YAESU FT-207R OWNERS
AUTO SCAN MODULE AND BATTERY SAVER KIT
15 minutes to in- cA m^^^^^M stall: scan restarts
when earner drops ofL busy switch controls automatic scan on-olt: in- etudes module and instructtons.
Model AS- 1. $25.00
lt%^ FT-207R BATTERY SAVER KIT Ijk^ MODEL BS-1 $14.95
'No more dead bettefies due to men^ory back- up
'30¥s 1^3 s power drain when squelched *SiiTip](3 to Install, step-by-step irvstmctiona and parls included
'd mA memory backup reduced to 500 AA. •45 mA receiver drain reduced lo 30 mA 'Improved audio Tldetiiy artd tcudness
ENGINEERING CONSULTING
P.O. BOX 94355 -'^^^o
RICHMOND. B. C. V6Y2A8. CANADA
Subscrwtion PrdbLSvi?
73 MagaiifiB does not keep subscrip- Iron records on the premrses. Ihere- fore calling us only adds (ime and doesn't solve the problem.
Please send a description of the problem and your most recenl ad- dress label to:
73 Magazine Subscription Dept. PO Box 931 Farmlngdal«, NY 11737
Thanli you afxj enioy yout ^ytiscnption
154 73 Magazine • February. 1382
ETCH BOARDS FAST
This Power Etching Svstem will handle PC boards up to 6" x h'\ The pump keeps acid agitattng for faster more even etchmg
Send $34.50 plus $3.50 for postage and handling to:
STEILMAKER ENfERPRISIS
250PEQUOT TRAIL
WESTERLY R 1.02891
^32
MICROWAVE DISH
24" True Parabolic Reflector
12" Focus
Made from .050" Spun Aluminum
Approximately 21 dBi Gain
$18.95
■dd 4S t>l*s tax
INDY AMATEUR SUPPLY
P.O. Box 421 Indianapolis, IN 46206
i^6
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Lsn |
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RED HOT SPECf A |
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Azden PCS3000 two-metef |
S2SS |
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Santec HT 1 2Q0 2 m handheld |
S279 |
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KDK 2025. MKII, wfTT mrke |
$269 |
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Janel QSA 5 2*m preamp |
$36.50 |
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Bearcat 20-20 Scan ner |
$278 |
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KantronJcs FOII Code Reader |
$360 |
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All MFJ items 12% off list | |
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Ten-Tec Argosy Xcvr |
$469 |
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Ten^Tec Delta Xcvr |
S738 |
|
Ter^*Tec Omni Xcvr |
SI 040 |
|
A2den PCS'300 2-m handheld |
$280 |
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2 only Icom 2KL tin ear amps |
S999 |
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AEAMorsematic |
$167 |
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icantronics Micro HTTY sender |
S25S |
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Sencher black paddles |
$35 |
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Ben Franklin Electronics |
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11572 N Main Hillstxsro KS 67063 |
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316-947-2269 |
1^439 1 |
C.B. SPECIAL
(Repeat Of a sail out)
CONVERT THESE TO 10 METER Fil
Hm* Hy-Gam 40 criinn») pnnltd Ctrcuit boards ass«rnt)iy (^^ticrv po! vOlumi COf^trot artd Ch«r>r>el swflch HHpr incJudedl Boards told as is Ojmensjon S 'X6'
1-0 pet $7.50 •!,
10-49 pet $6.50 ei.
fWhM«guanMttai la»1)
REMOTE 40 CHANNEL C.8.
Hemoles tiave a matat !ram« Speahef, piaaric case, ai^d control m^c nor inciudtKl. Sold as IS $14.95 •«
C.B BARGAIN
G.6. boards rrnssmg parts Or damaged, Can h^ used tot st^are parts Buv 9evera^' >
Order mlormal^on Please add 14,00 for S/H via UF5 COD s accented tor orders Toiahnfl S&OOO or rrora l^londs residents add 4°/d sales l»* Minimi^m order $15 00 Foreign Orders US funds oriiy add ;Q% for S/H MASTER CARD ftnd VISA accoc>t*d
Surplus Ei«ctronlG$ Corp*
7294 NW 54th St.
MtamJFL 33166 *^*^
P H J 305 887^228
TRS-80® DISCOUNT
*^313
1 ^800-84 1 -0860 i^it nwi
MICRO MANAGiMINT SYSTEMS »NC.
DEPT. NO, 1 3
DowniQwri FIqzc Slioppmg Canttf
115C Second Awe S.W,
Colro, Georgio 31736
913'377-7120 Go. Phono No,
Write For Free Catalog
RF MODULATORS
Small SJi« 1^ X 3 1 1'.^
Only
49,95
» CRYSTAL CONTHOLLEO FOR STABJI.ITV
• IC CtRCUITRV FOR EXCELLENT RELIABILfTY
• EXTERNALLY SWITCHED FOR CHANNELS Icr 4
The VM-1000 Rf Modufator is the same type and qu&lrty of Ihoae found in todays video tape lecordefs. II h as con ^e n ient ph o no j a c k 3 f o r v ideo and a udio 1 npu ts a nd has a sisndard "F" lyp^ conn&ttor for RF oulput. Power o SLippliE?d by an AC to DC power pacK wnich js included Call NOW forrmore inrormatlon and torquantity diacounts,
JJT DISTRIBUTING ^25
17210 Yukon Ave., Suite #1
Torrance, Calif. 90504
Call COD Orders lo; (213} 515-6800
this publication is Qvoiloble in
mKlOiOiin
j_ * *< « '
University Microfilms Internsttonal
300 North Zeeb Road
Oept. P.R.
Ann Affcor, Ml 48106
U.S.A.
l&BadfordRow Dtpt PR.
London. WC1R4EJ England
16-Pole Equalizing
RF Processor
hr«w SrwTHixid £E'2 mllt^itne ipMeh fnoamor for «nv iranr mitiBr or transceiver. An ouu^iMiifi nf tlv SJunmocxl no- con^raT^ RHIF jKOcenoo- ContMm bti^li-tri SE-1 mJki fiwiMiSKV-mpanK «|u«li»r for maximum Inuliigibilitir, Emv TO insttfl. No iiBiiwiiei modfficvtknf nqMlrKl Tws speciallv dsa^ned ftfnta crfOMi riiten. plu» tunl. ■«>«« IC dipping msotB exc^lvnT taih,|»wvf end linghi tjii i,ii.i^lnii iffl- d«v. VVidfr ^ynaniic-nngi IC balancaiJmodulitorfndpraduet detecior. Aim£o inpni/cquaSzar cirajitrY wof^ wttii both -.- and kiw- imprtwcf mtempNinw wntiout ovtrkw) or ntswrtian, AdiusTibte dipping 1} to 30 dO or mCMf*. Ec|uMiluiition G » 20 dB. VfeTsstility^ quatrtv. pg for nunc*: for ttw mniur iifho ctemands th? b««^ Model SE 2: I4O0.0O. Aifai 53 iMppiriQ pv onto^: $ 1 S cpverteas #ir CLPnipevisr PlHKoontacilngomipuc, PeBifadk24 49,!>4070, Ifl^otosdt, West Germvnv.
5h6*wood &igfn€€ring Inc
MS8 South Ogden St.
Denver, Colo. 80210
(303) 722-2257
-™ rt *yift Au torn* lie TR-2400 Kind Scinmr
iat Kenwood TR 2400 ^tops and locks on busy, ur slops^ and resumes i*hen c^rrter drops. ConlroKed by Itey board, no swilche;. td> add. Irtstalls easily tnsrde rig. six SuTipEfl coinnflcTioriiS> no modifrca^lJons. Does nol UiS# ipsct provided for PL Afls«mbeed— $24 9S Kit— £14.g&
TR*9000 PiMfiOfV Sc«nn«f
lor Kenwooo Tft.gOGO scans 5 memory channets Slops on busy and resun^es when cafri<er drops U^es «mi sling controls, NO 3wii£:r>es la add. InstaHs easily tn«id« rig StC product nflviiBiw S«f>t. issue 73 Magaiinm. AssflmblAd— S39^
tC-280 i*r>d Se«nrMr^S2i.95
Utinorv Sc«nn*f— (3ft.l£ botTi for K9M
* S^annefs do nol aftsct ftofmai rig opetration
* PiQ'laF readouts di9|iC9v scanned FreqtMtncy
' Alt scannefs are easy tD install using complete ^nd de tailad inslallation instructions
* AH scanners ASSEMRLED £ TESTED (emeepl kin
* Sa lis tad ion Guaranteed'
Send crhftcki ot money of der to:
^SC^VN
261 ST W Maiy Ann Rd^ Anlkx:ti. IL 60002
ir>clude It j50 postage £ nafxllirtg iljmois res incluid^ 5''^^Ji state tav
^.^a?
^See List of AdvefUs^rs on p»ge^ J i*
73 Magazine • February J 902 155
Decodes RTTY signals directly from youf re- ceiver's loudspeaker. » Ideal tor SWLs, novices & seasoned amateurs. * Completely solid state arid self-contained. Compact size fits almost anywhere. No CRT or demoduiator required . . . Nothing extra to buy! # Burtt-ln active mark & space filters with tuning LEDs for 170, 425 & 850 H^ FSK. * Copies 60, 67, 75, & 100 WPM Baudot & 100 WPM ASCIL * NOW you can tune in RTTV signals from amateurs, news sources & weather bulletins. The RTTY READER converts RTTY signals Into alphanumeric symbols on an eight-character moving LED readout. Wrjte for details or order factory direct.
RTTY READER KIT, model RRK , , , S/^.fl^ S149.9S
RTTY READER Wired and tested, model RRF . . , , , . , . %if^.p^ $219,95
Send check or money order. Use your VISA or MasterCard. Add $5,00 shipping and handling for continental U.S. Wisconsin residents add 4% Wisconsin State Sales Tax.
'-'SO
Corporation Telephone: (414) 241 8144
Post OHice Box 51 3G, Thiensville, Wisconsin 53092
^Hiffwcta^
WACOM
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K-79
fHaiHiBBapi
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P.O. BOX 7127 • WACO. TEXAS 76710 817/848-4435
BILLEf ELICTB«MCS
r.O.IOM4l)124aE BARUND. TX 75040 214/278^3553
^^^2
i 7 Watt Audio Amp Kit $6.95
5 SMALL, SIN<;LE HVBniD IC AND COMPONENTS FIT ON A r
5 K 3 1*0 BO AII^D (INCLUBEP) flUNS OM IS^VDC. GREAT FOR
Si ANV PI^OJECT THAT MEEDS AN INEXPENSIVE AMP. LE&S
f THAN 3% THD & 5 WATTS COMPATIBLE WITH S€ 01
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Dooinsilay Alarm Kit $^<9$
If you hqve trcujhlp ai-eepsng iancl you wothLd l^ke ihe rest of l:^e neighborhood To share yoi-'f misery ihcn Hns lima kil will Defor you' There is no way toaccuralelydescFitelhe un&arlhly howl.s. *creatn.«5 and 1 fines thai r.omfl out of ITiis kEl fcnit separate Enne ofiCiHalorfi nre mixed, cancelled and stei5pfirtai ay^rymg rale. lOW<solcraiy^otinds A great (on kii or a practicfil burglar afann Corn plolle with PC board and all necessary components less speaker For 6-T? VDC ORDER DA-Q2
H^'
3T3t Time Zone Clock Kir
Mi'croprocfissor/ROM ClocX kit kpfrps lo-caltim'e <I2 hour iifji^matl. artcl 2 wOrl<i lime iOneS (24 hour torrrnat): Large .6" ORANGE readouts 10 ftiin ID limer for HAMS. Comes complete with altratliveisJ^slrctaseandwallpliEgXFMR,
1
J Overvoltage Protection Kit $6.9S
■ H DksiI ihin mm ti^..[
• F#|1hArlQuc:h IrnrtI p^ni^l
• QygrtjfSTj^L TimelMse ' Qua!l1v collier irififitkfd ^n^
1
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i
i
F^oieci YO\jt ^tpvnttvB i?quipmepl Irom -overvoiiagB COiifTitions Ewery compuUsK should hsye Ome' WDrfti wlfh any luied DC |3i.Dwvr «Outc» frcmi 10 m 2^1 vollfc up ro 2& HmiH
Seund Effects Kit
th« SE-01 SQurvd Ellicli K1tt ha& all ycm iKHMl to h II lid a pn>aiamrn3tnn! sound effBcts mactiineexcepl a bfaSterv -arvd s-pesker On\y Ih* Sf-Ot provides you w»!h adPltionaf cif-cuitry Inal frtnliKjfcj n PuIh Geniritof. ■VKjIt <S)df1«ldr tnd Comparalar !0 n)i)ki> mere complex a&untJs ^ srsap lnclLjd«a Tlf^iTT tw/sipec&J aaaembly tftsTrutrtiortS and progrjimmiris^KJinhptES Y-ou can aasHy Cri&ate G-UniKQlt, E]iploB.^cni, Sitam TraJnt, Wind ft SuFt ana rnuch fn0f6. Complete Kll $1B^D
W-1h dualilv PC Bosrrt fLesstjUliJery * EpHr 1 JMTT Chip It PncludHJ EHira chtpi 13.19 H.
ElECTRONIC i^USlC MAKER
THIS Uf^iaUE KIT COMTAIIsrS A MICflOPfiOCESSO!^ Ct*tf WITH ffOM, IT HAS BEEN PftOORAMMED TO PLAY THE FIRST * ro 10 HOTES OF THE TUIWES LISTED BELOW. CONSTitUC- TfONtS SmPLE, WORKS W^TH ANY 9 OR 1A Ot^U ^PKn.lftOT IfiCtUDFDi.
TflE K3T WILL OPEflATE Of*
tSVfiC OH 12VAC WITH OPTIONAL
TflANSFOttMMIJ, (CONVERTS TO
117 V A O.Alt COtlPOHMttrS 3 BOAfiO
CempltltKil $16.95 TfanifarmerSl.lS
TuH^ TnrcudDT ' WllllMit TiHI ■ H^I«t|i^NChonjf ''
^l-fi $p»ni^t:4 Bnnncr ' YinhM EJo^tdl* "- Amatin
*m*MiT» • D^irihvhljnn) It^a - W#[3[S(nfl Hjiri:*! ■
OmUhimwi & iltijvi^ Jlh 't^tll »flrlli " L* ^i*n t r, fl oa* '
Sr<r Wnv Themr ' C^cm^ntln^ '' Augi.itlinc' ' jm^iv
0*411 ' -Grnd Si«c tht QuMn -^ Cf,if,f,ri Btj^^^f '
M HriPillpK^F ' O ^ole Mi« ' ^»m& L ikI* ' T IH £ nil ' Blu*
iJanubr " Bratrnit |.itllJihr ' Wrt*iwTin™t*r thirfiB "
Simpiv ChlmE ' C!i«f:intll[M| QnhjtPK ni-imE
Start the newyeeir rigftt , . the satfing w&yf
OtA.
CA3O90 TRA^JS COND AMF
TLO-SZ DUAL BI-FET AMP
C D J Sfifi C MOS S^O 'SO CM Tfl
MC3301 QUAD OP AMP IH?>E »l
FPT500 PHOTO TRANSISTOR
TIP \m HPH DARL £A IC
TEMP CONTROLLED HOTPLATE V
as
.A6
.44 .44
rf 1ft
DUAL PHOTO RESISTOR 3/S T' BOHM SPKR, ?5 W AV 3-S9-fO SOUND EFFECTS fin PAGE MANUAL FOR ABOVE JUMBO RED LED ASST STYtES
Ti.as
2D>1.BH
Regulator Card Kit $14.9S
Tnii Hi ihB PegH^'ijiicir Cird frflm ouj Famoys. 2EIA pQwtr Supply KIL Although we ran oul of 1l»e tfansiLKmera anJ healslnka, rnany
£Ll:tilpni-n a hn^t; hc;f!n ^hl^1c.7<iiic:ji4¥'hl'»<ir (iw^
vcilliQi r^ulaticn end *iSi 4diiis14tol* foSd tdck curreni inriiciTig: Output voHjigeli ilibdii lo SOOHV irtjm D lo U Ampi ind idjuililidt tiwm 11 Id %^ yollB.. "Designed 1o driMe2 high c\*iTEin J N FN .trans lalor-s \2^unx zwasoi or equlv.^ Tn^unfl asaammes quIchJy Indudf^d are alH tha en bn^rd com^rn^ts lAi^lvd^i^^^ ?i di'iv^^ hr9Fi$i.K!&l dn^ O-vcir-E^imp $h<Jl:d^wn
^uni&cw De!jign0i7tri&cTP*do*TiioaBtaflda-rd 3"' diamale^ t^mpuler grade Inier tap. the quaJlly fjlated PC card la 3-1/?" « ^^*' .
IHITM INS^TR.'C.IIOMS^
niOUiATOn CARO KIT %M,M
HIQKCURRSNT PARTS
(2 ' ihlllrf 2 a JSA arW4*| fS.QO
3 1 .OM HFD OfiO 4DV Camputtr (if Ml* S3. SO
Roqulrt* TrMKarnnr with 14 - 1tUJC Oyl # Thi
THE SUPEfl MUSIC MAKER KIT
REVtSiaN2-SZ4.95
Nrw vOM Ciu) pl^v l!iir<liE-[fH ul smgs'Rina the BuHill Supur Wuilt' MaN Bt Tt* e •:! 1 it liHurM t iIuqIei ftcflqrv p«rai}4-atnmHd rnln-DprDCBiNr IC tha; CCtllfS wi th 2!:- |:.i £ • |M .-iiir.:i niiiiivLl ¥■ I a ■ UuhES E V at^itinq l?re add 111 D i^H I PRflM S I ??(ifl"s I We ^ys lem uan bi: fi^prtrHHd l[?pl(ivi up 10 ll)0&i»lBS[rtrPRaPi( TSu; w-l i:<i iritis wilh ill ElfElrwilc utniwiinlt |1kSI Iht PflQMI. and a [Jr'IfRd. plaietf and LciERnE4l PC fionrci which mflasuffii ^" s J-.V t^k 7 i^tll intf IJMir ^ECEidr en on ^he Si^me fC board and dnvE'i an & ohrn SiPCiikur rnal incluilRdI Smcf Ihfl ijnil vtorK*. m 12 VUC or I? PC ■.■i^hitie di por 1^1 tk 11 i!?r HM>n It- pQ'^'iihte Whll ild VBu pi fflr k24.S&T fMHrythlna IVUl I stwakar. Er3nE.lDfmEr.t1.tt SWilchK. ami Pinil. Ai1ditiJi.;i;il :!?0e PflOMS allMj'n con! aim Rg, otipular imwiS ^■i&ivilahln In? iS.ffi Riich Lists fi! JvijilalilE' PROM aUKifps 3r» AVitilabIc mn rAq^iiCAl
HIP SurlEctiBS l>ri; g pn-s [}w! ^ rxD.!i ?.a)/Sat fC^n =lie dJFEnlly $af{lir«j td PC Bri Id acnejs
tllHR?.!
Ullry SwitttiBt ywg ^jKi^MiOn ?.$''Sb|
iFn-r reflinll Wklofl l-Q PC Bd to kc^^s liinftsi htUBClJMf Tjh Plastic CilB ft.M
WHHpJiig TraPBlflrfflir J.DIT
iFi:i optiatmn OJi n?VAC h&use VDHlaaEl
ORDERING tN FOR MAT ION: C9U or Wffta far Frae^ Cutshg
TEMP ERE D G L A SS 11 0"F to 1 60'f 1 ■ BB 3550 < Fa f M ICRO P CH I P Z JQ
lOtCia SENSITI\/E GATE SCH 3^*B
i i
f f
f
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¥
\
SUPER SPECIAL DEALI STANDARD C, 60 CASSETTE NEW IN PLASTIC CASES rOP QUALITY DRIG. USED m-' PJGtTAL' APP PREO RE-r-.POf*S.E :iOOH2 - IfiKHZ 1.3^5*^. 3/3.50
CO-D MINl*fllJM $JO.OD A ADD SJ.SO FOR COD'S
- UPS DELivtnv ApORES^ MUST ACCOMPAr^r ALL coo F
I
ORDERS
jl.DD HANDLING QN OROFHS UNDER Sld.H)
VI$A. MC CAflDS- Ofl CHECK
ADti ^■•■^ FOR SH1PP1HC
TEKA^ «E&IOf NTS ADD S^a STATE SA|,|&^ 1 An
ALL f OqErGN ORDERS ADD 2W-- FOIl SHIPPING
(CANADA n=..| No FOREIGN COD &
CALL (214) 37fl-3iSS5 TO Pi Att CRtDIT CARD Qfl COO
ORDER
J
■I
I
+
futwi tfm^
GOTHAM ANTENNAS
(81 3) 584-8489
SMALL LOT TRAP DIPOLES
MODEL TSL 6040 TSL 4020
BANDS
80,40
40.20.15
LGTH
78'
40"
SMALL LOT SHOf^TENED DI POLES
|
SL8010 |
eO,-30.20. 15,10 |
75' |
S59,95 |
|
SL reo |
1^0 |
130' |
S36,95 |
|
SLSO |
80 |
63- |
S35.S^5 |
|
SL'40 |
40,15 |
33- |
$34.95 |
|
FULL SIZE PARALLEL OIPOLES |
|||
|
FPD8D10 |
80.40.20. 15.10 |
130' |
S499& |
|
FPD4010 |
40.20,15.10 |
63 |
S449S |
|
^»EW! POflTABLE VERTICALl IDEAL FOR |
APAHTMENTS> CAMPING. TRAllERSJ
Folds to &' PacVage No RadtaJs, R^qutred Fufly Assembled. Full Legal Lirrtil. 11 VSWR
MODEL BANDS HGHT PRICE
PVeOlO 8010 13" $5995
PROVEN DESIGN ■ QOTHAM ALL SAND VERTICALS
V160
V-flO
V40
|
i6o,ao.40.?d, |
33' |
53^.95 |
|
fS.10.6 |
||
|
80,40,20 |
23 |
$3795 |
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15.10,6 |
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40.20,15.10.6 |
23 |
£3S.§S |
FAM0U5G0THAM QUADS ^ 2 Elem^nis — 3 Bands Complele £1 19.95
CHAMPIONSHIP GOTHAM BEAMS Fyll Size Complete trom t79.95
CALL OR SEND LARGE SASE FOR CATA- LOG Shipping: Dipok«£ & Verl^cals 52.50 USA;S7.00 Ca nada: S5 00 FPO. APO Beams & Quads Shipped UPS or Freight Collect. FIs. add 4% Sales Tux
P.O. Box 776 • Largo, FL 33540
1^417
PRICE $49.95
S4/.S5
150 TSMagazin^ • February, 1982
on
Scanners!
NEW Rebates!
Communications Electronics™ the
world's largest distributor of radio scan- ners, celebrates 1 982 with big savings on Bearcat scanners- Electra Company, the manufacturers of Bearcat scanners is offering consumer rebates on their great line of scanners, when purchased be- tween February 1 and March 16, 1982.
With your scanner, you can monitor the exciting two-way radio conversations of police and fire departments. Intelligence agencies, mobile telephones, energy/oil exploration crews, and more. Some scan- ners can even monitor aircraft transmis- sions! You can actually hearthe news i)efo/'© if s news. If you do not own e scanner for yourself, now's the time to buy your new scanner from Communications Electron- ics. Choose the scanner thafs right for you, then call our tolHree number to place your order with your Visa or Master Card
We give you excellent service because CE distributes more scanners worldwide than anyone else. Our warehouse facilities are equipped to process thousands of scanner orders every week. We also export scanners to over 300 countries and military instal- lations. Almost all items are in stock for quicl( shipment so if you're a person who prefers fact to fantasy and who needs to know what's really happening around you, order your scanner today from CEl
NEW! Bearcat^350
The Wf immte SynfhmsixBd Scanner!
List price $599 95/CE price$399.C»0/£50,00 rftbate Your final cost is & low $349-00 7-Bandf 50 Chmnnei • Alpha-Numoric • If o* gtybM sesttner m AM Aircraft mntt Pubiic Servicm bands* • Frioriif Channel • AC/ DC Bands: 30-50, 11 8-136 AM. 144-174,421-512 MHz. The new Bearcat 350 introduces an incredible breakthrough in synthes^^ed scanning: Alpha- Numeric Display. Push a button— and the Vacuum Fluorescent Display switches from "numeric" to word descriptions of whaf s being monitored 50 Channels in 5 banks. Plus, AutoS Manual Search, Search Direction, Linttt & Count. Direct Channel Access Selective Scan Delay Dual Scan Speeds. Automatic Lockout. Automatic Squelch, Non- Volatile Memory. Order your Bearcat 350 today!
Bearcat® 300
Li5t price $549. 95/CE price S349.OO/$SO.0O rebate Your final cost is a tow $2d9,00 7-Bandf 50 Channel « Service SeBreh * Me- Gfystaf scanner * AM Aircraft end Puhlic Service tends* • Priority Channel • AC/ DC Bands: 32-50, 11S-136AM, 144-174,421-512 MHz, The Bearcat 300 is the most advanced automatic scanning radio that has ever been ottered to the public. The Bearcat 300 uses a bright green fluo- rescent digital display, sc it's ideal for mobile applications. The Bearcat 300 now has these added features: Service Search, Display Intensity Control, Hold Search and Resume Search Keys, Separate Band keys to permit lock-m/lock-out of any band for more efficient service search.
I4EW! Bearcat® 350
FREE Bearcat® Rebate Offer
Get a CQupan good for a £50 rebate when you purctiase a Bearcat 350 or 300" $25 rebate on model 250 or 20/20; $1 5 rebate on modet 210XL $10 rebate on model 160 or 4-6 Thin Scan. To get your rebate, mait rebate coupon with your Original dat^d sales receipt and the Bearca: model number from the carton ro Electra, Voull receive your retiate In foLir to six sAi'eeks. Offer valid only on purchaser made betwen February 1, 1 962 and March 1 5, 1 932 All requests must be postmarked by March 31, 1&S2 Umtt of one rebare per household. Coupon must accompany all rebate reqwesfa and may not be reproduced. Offer good only in the U.S.A. Void where taxed or prohibited by law. Resellers, companies, clubs and organizations-both profit and non-prottt-are not eligible for rebates. Employees of Electra Company, I heir advertismg agencies, distributors and retaiiers of SearcaP Scanners are also not eligible for rebates. Please be sure to send in the correct amount for your scanner. P^y the listed CE pri,ce in this ad. Do r^ot deduct the rebate amoimt since your rebate will be sent direcUy to you (rom EJe-ctra. Orders recei^ved with insufficient payments will not be processed an d wri I b e ret u rn ad. Otte r sul^ ject t o c hang e w J t ho ut not ice.
Bearcat® 250
List price $429.95/CE price «279-OO/$25.O0 rebate Your final cost is a low $254.00 S-Bandf 50 Channel m Crysiailess e Searches Stores « Recoils • Digiiat dock • AC/ DC Priority Channel • 3-Band * Count FmatureM Frequency range 32-50, 146-174, 420'612 MHz, The Se^rcaf 250 performs any scanning function you could possibly want. WWh push button ease you can program up to 50 ctiannels for auto nna tic monitoring. Push another button and search for new frequencies There are no crystals to limit what you want to hear A special search feature ot the Searca? 250 actually stores 64 frequencies and recalls them, oneat atilne^at your convenience.
MEW.' Bearcat® 20/20
List price S449. 95/CE price S2eQ.0O/$25.O0 rebate Your final dOSt is a low $264.00 7-Band, 40 Chennel • Crymtailmsm • Search e^ AM Aircraft and Pubiic Service bands * AC/DC Pricriiy Channel • i>ir»ctOhann&l Access • DelsY Fr^QuertCYCsnge 32-50. 1i8-T36AM. 144-174. 420-5^2 MHi.
The Bearcat 20/20 automatic scanrfing radio replaces the Bearcat 220 and monitors 40 Jrequen- cies from 7 bands, including aircraft. A two-position switch, located on the front parrel allows monitohng of 20 channels at a time.
Bearcat® 21 OXL
List price S349 95/CE price S229.00/$l 5.0O rebate
Your final cost la a low §21 4. GO
S'Banvtf iO Channel • Crysfalless • AC/ DC
Frequency range: 3250, 144 174, 421-512 MHz, The Searca/ 21 OXL scanning radio is the second gener- ation scanner that replaces the popular Bearcat 210 and 211. It has alrnost twice the scanning capacity of the Sear(?af 210 With 18 channels plus dual scanning speeds and a bright green fluorescent display. Auto matic search finds new frequencies. Features scan delay, single antenna, patented track tuning and more!
Bearcat® 1 60
List price $a99.95/CE price S194.0O/S10.0O rebate Youf final cost is a low Si S4.0O 5'Band, 19 Channel • AC only * Pricritw Dual Scan Speeds • Direct Chennoi Access
Frequency range: 32-50, f 44 174. 440-512 MHi. The Bearca f 1 60 is the least expensive 0eafcaf crystai- less scanner Smooth keyboard. No buttons to punch No knobs to turn. Instead, finger-tip pads provide control ot ait scanning operations.
NEW? Bearcat® 100
riM first no-crYstmiprosremmat>l0 h^ndh^fd scanner.
At tow 30-120 d^ys for detivery after receipt of order due to the high demand for this product. List price $449.96/CE price $299. OO B*Band, f 0 Channal s Litiuid Crysial Display Search * Untit • Moid • Lockout • AC/DC Frequency range: 30-50, 138-174, 4Q8-51 2 MH^ The world's first no-crystal handheld scanner has compressed into a 3^' x 7" x 1 VV case more scanning power than is found in many base or mobile scanners. The Searcaf 1 00 has a tuli 1 6 channels with frequency coverage that includes alf public service bands (Low. High, UHF and ' r bands), the 2-Meter and 70 cm. Amateur bands, pfus MiHtary and Federal Government frequencies. It has chrome-plated keys for functions that are user controlled, such as lockout manual and automatic scan. Even search is provided, both manual and automatic. Wow,,, what a scanner!
Th e Bearcat ^ 00 produ ces a udi c po we r out pu t of 300 milliwatts, is track-tuned and has selectivity of better than 50 dB down and sensitivity of 0.6 microvolts on VHFand 1.0 microvolts on UHF, Power consumption is kept esttremety low by using a liquid crystaJ display and exclusive low power integrated circuits,
I nc t u d ed i n ou r low C E pr ice i s a St urdy ca rry i n g case^ earphone, battery charger/AC adapter, six AA ni-cad batteries and flexible antenna. For earliest delivery from CEt reserve your Bearcat 100 today.
TEST ANY SCANNER
Test any scanner purchased ifom Communicattons Electronics' tor 31 days before you decide to keep it K tor any reason you are not completely salisfiet^, return it in original condition with all parts in 31 days., for a prompt refund (less shipping/handling ctiarges and rebate credits).
Bearcat® Four-Six ThinScan'"
List price $189 95/CE prfce $1 24.0O/S1O.00 rebate Your ftnal cost is a low $1 1 4. 00 Frequency range: 33-47, 152)64, 450-503 MHz. The incredible. Bearcat Four-Six Thin Scan" is like having an information center in your pocket. This four band. 6 channel crystal con trolled scanner has patented Track Tuning on UHF Scan Delay and Channel Lockout. Measures 2^ X 6 V* « V I ncludesfuhher ducky antenna. Order crystal certificate tor each channel. Made in Japan.
Fanon Slimline 6-HLIJ
List price $169 9S/CE price $109.00 tow cost S-channelt 3- band scannerf
The Fanof^ Slimline S-HLU gives you six channels of crystal Controlled excitement. Unique Automatic Peak Tu n ing C i rcui t adj usts t h e rec e i ve r front e nd I or max i^tn u m sensitivity across the entire UHF band. Individual chan- f>el I oci<out switches. Frequency range 30"50r 146-1 75 and 450-51? MHt Si^e 2^A xS^/* x 1' Includes rubber ducky anlen na. If you don't need the UHF band, get the Fanon model 6-HL forSSg.OO each, and save money. Same high performanceandfeaJures as themodel HLU without the UHF band. Order crystal certificates for each channel. Made in Japan,
OTHER SCAHHERS £ ACCESSORmS
HEWl Regency' t 0810 Scanner $319,00
mew? Rgency' D300 Scanner $219.00
JiEW/ Regency' DItMD Scanner $169.00
«eWf Regency' H604 Scan rier $129 00
Regency" M400 Scanner $259 00
Regency' Ml OO Scanner $199 OO
Regency ^ R1 040 Scanner , , $149,00
SC M A'6 Fa no n Mo bi le Acta pter/ Battery Qh^ rger ... $49 00
CHB-6 Faron AC Adapief/Batlery Charger $1 S.0O
CAT-6. Fanon carrying case wjth b(?lt cNp . , $15.00
AUC-3Fancinayto1ighleradapter/BaitervCharger $15 OO PSK-6 Base Power Supply/ Bracket for SCMA'6 . . $;J0 00
SPSO &QsrC0t AC Actapter S9 00
SP51 Bedrest Sartery Charger . $9 00
SPSS B&arcat 4-6 ThinScan" carrying case Sf 2 00
MA&Q6 fl^gertgyf carrying case foe H604 . . . $t S 00
FB-E Frequency Directory for Eastern USA St 2.00
FB'W FrequfSncy Directory lor Western Lf, SA $1 2.00
FFD Federai Freqiienc/ Dhrectory for LI.S.A. . $12 00
TSG TopSeerer Regrstryof US, Government Freq. . .510.00 ASD Frequency Directory for Aircraft Bartd . . . . $10.00
B-4 1 .2 V AAA Ni Cad batteries [Set of four) $9 00
A-1 3&CC Crystal cerliticate - $3.O0
Add $3 .00 shipping for aM accessories ordered alt he same time.
INCREASED PERFORMAHCE AMTEMNAS
If you want the utmost in pertorrr^ance from your scanner, i^t isessentiallt^atyouuseanexternalantenna. We have six ba^e and fTl!obi^e antennas speci'fically designed tor receiving all bands Or^der #A60 is a magnet mount mobile antenna Order #A61 is a gutter clip mobiie antenna Order #Ae2 is a trunk-lip mobile antenna. Order #A63 is a ^* inch hoie mount Order #A64 is a % inch snap-in mount, and # A70 isan ail band base station antenna. All antennas are $35.00 and $3 00 for UPS shipping in the continental United Slates.
BUY WITH CONFIDENCE
Togo! the test est detivery from CE ot any scanner, i^end or phone your order directly to our Scanner Disintaution Cenrer' Be sure !o calculate your pnce usmg the CE prices in this ad. Michigan residents ptease add 4% sales tax. Written purchase orders are accepted from approved gov- ernment agencies and most weli rated firms at a HO* surcharge for net 10 billing. AH sales are subiect toavaila- brjity. acceptance and verffication. All sal^aon accessories are fma! Prices, terms and specifications are subiect io change wilhoal notice. Out ot stock items w^ll be placed on backorder aulomatfcalty unless CE is instructed diff^renlly. Most products Jhat we self have g manufacturers warranty, Free copies Of is/arranties on these products are avaiiable prior to purchase bv writing to CE. lnternati;onal orders are invited with, a $20 00 surcharge tor special handHr^g in addition to shipptiig chfsrges. A^f shrpmenis are RO B. Ann Arbor Michigan No COIN'S please Non-certi^fiedandforei^gn checks require ban-k clearance. Winirr^urn order S35.O0
Mail orders to: Communications Electronicsr Box 1002, Ann Arbor, Michigan 48106 USA. Add $7.00 per scanner or phone product for U.P.S. ground shipping and handfing, or $ 1 4.00 for faster U.P.S. air shipping lo some locations. If you have a Visa or Master Card, you may call anytime and place a credit card order. Order toll free in the U.S-A. Dial 800-521-4414. If you are outside the U.S. or in Michigan, diat 313-994-4444. Dealer inquiries invited. Orber without obligation todayl
Scanner Distrfbution Center' and CE logos are trade- marks of Communications Electronics* f Bearcat is a federalty registered trademark of Electra Company, a Division ot Masco Corporation of Indiana, trtegencj^ is a federally registered trademark of Reg^ency Efectrontcs Inc AD # i 1 2 1 0S 1
Copyright -1982 Communications Electronics'"
fV
^377
COMMUNICATIONS ELECTRONICS"
a54 phoflnii n BoJi ^007 D Ann ArtKvr. WHthigan 4fl106 U S A. Cal I TOLL^ F n E E {AOO] 52 1 44 1 4 or wi*i4* U . S. A ( 1> S| 904^4444
^"■^ electromc;^
Introducing
(602) 242-3037 (602)242-8916
2111 W. CAMELBACK ROAD PHOENIX, ARIZONA 85015
TVRO CIRCUIT BOARDS
Satellite Receiver Boards— Now in Stock
DUAL CONVERSION BOARD .$25.00
This board provides conversion from the 3,7-4.2 band first to 900 MHz where gain and bandpass filtering are provided and, second, to 70 Mliz. The board contains both local osciilators, one fixed and the other variable, and the second mixer. Con- struction is greatly simplified by the use of Hybrid IG amplifiers for the gain stages.
SIX 47pF CHIP CAPACITORS
For use with dual conversion board ..-...,, ,$6.00
70 MHz IF BOARD $25,00
This circuit provides about 43d8 gain with 50 ohm tnput and output impedance. It is designed to drive the HOWARD/ COLEMAN TVRO Demodulator. The on-tKDard bandpass filter can be tuned for bandwidths between 20 and 35 MHz with a passband ripple of less than Vt dB, Hybrid IC's are used for the gain stages.
SEVEN .01 pF CHIP CAPACITORS
Foruse with the70 MHz IF board. , . , . .$7,00
DEMODULATOR BOARD ,$40.00
This circuit takes the 70 MHz center frequency satellite TV sig- nals in the 10 to 200 millivolt range, detects them using a phase locked ioop, de-emphasizes and filters the result and ampli- fies the result to produce standard NTSC video. Other outputs include the audio subcarrter, a DC voltage proportional to the strength of the 70 MHz signal, and AFC voltage centered at about 2 volts DC.
SINGLE AUDIO. .... .$15.00
This circuit recovers the audio signals from the 6.8 MHz fre- quency. The Miller 9051 coils are tuned to pass the 6,8 MHz subcanier and the Miller 9052 coil tunes for recovery of the audio.
DUAL AUDIO , .$25-00
Duplicate of the single audio but also covers the 6.2 range.
DC CONTROL. $15.00
SPECIAL SET OF FIVE BOARDS $100.00
INCLUDING DUAL AUDIO (2 single audio boards)
1900 to 2500 MHz MICROWAVE DOWNCONVERTER
MICROWAVE RECEIVER This receiver is tunable over a range of 1900 to 2500 MHz approximately, and is intended for amateur use, The local oscillator is voltage controlled, making the I.F. range approximate- ly 54 to 88 MHz for standard TV set channels 2 thru 7.
P.O. BOARD with DATA 1to5 $15.00 6to11 $13.00 12to26 $11.00 27-up $9.00
P.O. Board with all parts for assembly $49.99 P.O. Board with all chip caps soldered on. . . $30.00
P.C. Board with all parts for assembly P.O. Board assembled & tested $69.99
plus 2N6603. $69.99 P.C. Board assembled & tested with 2N6603$79.99
HMR 11 DOWNCONVERTER with Power Supply, Antenna (Dish) & all Cables for installation. 180 Day Warranty.
1to5 $150.00 6 to 11 $140.00 12- up $125.00
YAGI DOWNCONVERTER with Power Supply. Antenna (Yagi) & all Cables for installation. 90 Day Waranty.
1to5 $150.00 6 to 11 $140.00 12 -up $125.00
YAGI DOWNCONVERTER as above but Kit. (NO CABLES) With Box.
1to5 $125.00 6to11 $115.00 12-up $100.00
HMR II DOWNCONVERTER as above but Kit. (NO GABLES) With PVC.
1to5 $125.00 6 to 11 $115.00 12- up
.00
«#^¥*»»**if*»»#*»*#«»^"
f *=**^*^
SPECIAL NEW STOCK OF CARBIDE DRILL BITS— YOUR
1.25mm 1.45mm 3.2mm 3.3mm
1/8
3/16 5/32
7/32
13/64 19 20 24
Zd
29 30
31
36 37 38 39 40 44 45 46
47 48 49
50 51 52
53 54
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CHOICE $1.99 |
■**■■ urn |
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55 |
63 |
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56 |
64 |
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57 |
65 |
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58 |
67 |
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59 |
68 |
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60 |
69 |
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61 |
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62 |
■
1$0 73 Magazine • February, 1982
"DOWN CONVERTERS"
1900 to 2500 MHZ Microwave Downconverters
In Regards to your request for information concerning our microwave receiver. This receiver is tunable over a range of 1900 to 2500 MHZ approximately, and is intended for amateur use. The local oscillator is voltage controlled (i.e.) making the I.F. range approximately 54 to 88 MHZ For Your Standard TV Set Channels 2 thru 7.
P. C. Board with Data
1 to 5
$15.00
6 to 11
$13.00
12 to 26
$11.00
27
P. C. Board with all chip caps solder on.
P,C. Board with all parts for assembly.
P. C. Board with all parts for assembly plus 2N6603
P. C. Board assembled and Tested.
P. C. Board assembled and Tested with 2N6603.
HMR II Downconverter with power supply — antenna (Dish)
180 Day Warranty .
1 to 5
$150.00
6 to 11
$140.00 12 to up
$125.00
Yagi Downconverter with Power Supply , Antenna (Yagi) and all cables for Instalation. 90 Day Warranty.
up
1 to 5
$150.00
6 to 11
$140.00 12
up
$125.00
Yagi Downconverter as above but Kit. {NO CABLES) With Box.
1 to 5
$125.00
6 to 11
$115.00 12
up
$100.00
HMR II Downconverter as above but Kit, {NO CABLES) With PVC.
1 to 5
$125.00
6 to 11
$115.00 12
up
$100.00
$9.00 $30.00 $49.99 $69.99
$69.99 $79.99
Special New Stock Of Carbide Drill Bits.
|
1.25rnn |
20 |
40 |
53 |
63 |
|
1.45mm |
24 |
44 |
54 |
64 |
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3.2inn |
26 |
45 |
55 |
65 |
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3.3i[in |
29 |
46 |
56 |
67 |
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1/8 |
30 |
47 |
57 |
68 |
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3/16 |
31 |
48 |
58 |
69 |
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5/32 |
36 |
49 |
59 |
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im |
37 |
50 |
60 |
Yo |
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13/64 |
38 |
51 |
61 |
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19 |
39 |
52 |
62 |
Your Choice $1.99
Tod Free Number 800-528-01 80
(For orders only)
Q^^^§\x elect roi|ics
*^159
See List of Adv&fUsers on page T 14
73Magazine • February, 1982 159
"FILTERS
99
Con ins Mechanical Filter #526-9724-010 Model F455Z32F 455KHZ at 3.2KHz Wide.
$15. 00
AtUs Crystal Filters
5.52-2.7/8
5.595-2.7/8/U
5.595-. 500/4/CW
5.595-2.7/LSB
5.595-2.7/USB
5.645-2.7/8
9.0SB/CW
5.52MHZ/2.7KH2 wide 8 pole 5.595HHZ/2.7KHZ wide 8 pole upper sideband 5. 595MHz/. 500KHZ wide 4 pole CW 5-595MHz/2.7KHz wide B pole lower sideband 5.595MHZ/2.7KHZ wide 8 pole upper sideband 5. 645MHz/ 2. 7 KHz wide 8 pole 9.0MHz/ 8 pole sideband and CW
Your Choice $12.99
Kokusai Electric Co. Mechanical Filter #MF-455-ZL-21H
455KHZ at Center Frequency of 453. 5Kc Carrier Frequency of 455Kc 2.36Kc Bandwidth
$15.00
Crystal Filters Nikko FX-07800C TEW FEC-103-2 Tyco/CD 001019880
|
Motorola |
4884863B01 |
|
PTI |
535QC |
|
PTI |
5426C |
|
CD |
A10300 |
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Ceramic Fi |
Iters |
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Murata |
BFB455B |
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CFM455E |
|
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CFM455D |
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CFR455E |
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CFU455E |
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CFU455G |
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CFW455D |
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CFU455R |
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SFB455D |
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SFE10.7 |
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SFG10.7MA |
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Clevite |
TO-OIA |
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T0-02A |
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Nippon |
LF-B4/CFU455I |
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LF-B6/CFU455H |
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LF-C18 |
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Tokin |
CF455A/BFU455K |
|
Mat sushi ra |
EFC-L455K |
7.8MHz
10.6935
10. 7MHz 2 pole 15KHz Bw. Motorola #48D84396K01
Thru #48D84396K05
11.7MHz 2 pole 15KHz Bandwidth
12MHz 2 pole 15KHz Bandwidth
21.4MHz 2 pole 15KHz Bandwidth
45r^Hz 2 pole 15KHZ Bandwidth (For Motorola
Comnuni cations equipment)
10.00
10.00
4.00 5.00 5.00 5.00
5.00
|
455KHZ |
|
|
455KHZ +- |
5.5KHZ |
|
455KHZ +- |
7KHz |
|
455KHZ +- |
5.5KHZ |
|
455KHZ +- |
1 . 5KHz |
|
455KHZ +- |
IKHZ |
|
455KHZ +- |
IKHZ |
|
455KHZ +- |
3KH2 |
|
455KHZ |
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10.7MHz |
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10.7MHz |
|
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455KHZ |
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455KHZ |
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455KHZ +- |
IKHz |
|
455KHZ +- |
iKHz |
|
455KHZ |
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455KH2 +- |
2KKZ |
|
455KHZ |
$ 2.40 6.65 6.65 8.00 2.90 2.90 2.90 4.35 2.40 2.67 10.00 5.00 5.00 5.80 5.80 10.00 4.80 7.00
RQTRON MUFFIN FANS Model Mark 4/MU2A1
These fans are new factory boxed 115vac at 14watts 5O/60cps
CFM is 38 at 50cps and 105 at 60c ps.
Impedance Protected- F
$ 7.99
SPECTRA PHYSICS INC. Model 088 HeNe Laser Tubes.
Power output l,5niw. Beam Dia. .75niii. Beam Dir. 2.7mr. 8Kv starting voltage
68f( ohm Iwatt ballast lOOOvdc +-100vdc 3.7ma. TUBES ARE NEW $59.99
lao 73MagaTine • February, 1982
"AMPLIFIERS"
AVANTEK LOW NOISE AMPLIFIERS
Model s
Frequency Range
Noise Figure
Voltage
Gain
Power Output
Price
UTC2-102M
30 to 200MC
1.5d8
+15vdc
29dB
IdB Gain +7dBm
$49.99
/\p_20-T
200 to 4aOMC
6.5dB
+24vdc
30dB
IdB Gain +20dBm
$49.99
AL-45-0- 1
450 to 800MC
7dB
-6vdc (a +12vdc
30dB
IdB Gain -5dBm
$49.99
AK-IOOOH
500 to lOOOMC
2.5dB
+12vdc 0 -12vdc
25dB
IdB Gain +8dBm
$69.99
Mini Circuits Double Balanced Mixers
Model RAY- 3
Very High Level (+23dBm LO) 70KHz to 200MH2 LO,RF,DC to 200MHz IF
Conversion Loss,dB One Octave From Band Edge 6Typ./7.5Max. Total Range 6.5Typ./8Max.
Isolation, dB Lower Band Edge To One Decade Higher (LO-RF/LO-IF) 55Typ./45Min. Mid. Range
(LO-RF/LO-IF) 40Typ./30Min. Upper Band Edge To One Octave Lower (LO-RF/LO-IF) 30Typ./
25Min.
Price $^4.99
Model TSM-3
Standard Level (+7d8m LO) .IMHz to 400MHz LO,RF,DC to 400MHz IF
Conversion Loss.dB One Octave From Band Edge 5.3Typ./7.5Max. Total Range 6.5Typ./8.5Max.
Isolation, dB Lower Band Edge To One Decade Higher (LO-RF/LO-IF) 60Typ./50Min. Mid. Range
(LO-RF/LO-IF) 50Typ./35Min. Upper Band Edge To One Octave Lower (LO-RF/LO-IF) 35TYP./
25Min.
Price $11.99
i^^^^^"^^^
Hewlett Packard Linear Power Microwave RF Transistor HXTR5401/35831E
Collector Base Brakedown Voltage at lc=100ua Collector Emitter Brakedown Voltage at Ic=500ua Collector Cutoff Current at Vcb=15v Forward Current Transfer Ratio at Vce=15v,Ic=15ma Transducer Power Gain at Vce=18v»Ice^60ma,F=2GHz. Maximum Available Gain at Vce^l8v,Ic^60ma,F=^lGHz/F-2GHz Price $29.99
Motorola RF Power Amplifier Modules
35volts min* SOvolts min, lOOua max* 15min,40typ,125max 3dBmin,4dBtyp 14dB typ»8dB typ
|
Model |
MHW612A |
MHW613A 150 to 174MH2 |
MHW710 |
MHW72a |
|
Frequency Range |
146 to 147MHz |
400 to 512MHz |
400 to 470MHz |
|
|
Voltage |
12.5vdc |
12.5vdc |
12.5vdc |
12.5vdc |
|
Output Power |
20watts |
30watts |
13watts |
20watts |
|
Minimum Gain |
20dB |
20dB |
19.4dB |
21dB |
|
Ha nnon i cs |
-30dB |
-30dB |
40dB |
40dB |
|
RF Input Power |
400nfiw |
500mw |
250nM |
250mw |
|
Price |
$57.50 |
$59.80 |
$57.50 |
$69.00 |
Toll Free Number 800-528-01 aO (For orders only)
Q^^i\T elect roi|ics
See Lt^f of Aa^erttsers on pjtge tJ4
73Magsime • February, 1982 161
fifi
TRANSISTORS"
WATKINS JOHNSON WJ-M62 3.7 to 4.2GHz Communication Band Double Balanced Mixer
$100.00
SSB Conversion Loss 4.9dB Typ. 6dB Max. fR 3.7 to 4.2GH2
5.5dB Typ. 6.5dB Max. fl DC to 1125MH2 fL fR
fl 880MHz fL fR fR 3.7 to 4.2GHz 4.9dB Typ. 6dB Max. fl'aO to il25MHz fL fR
SSB Noise Fiqure
Isolation
fl at R fL at I
5.5dB Typ. 6.5dB Max. fl 880MHz fL fR
30dB Hin. 40dB Typ.
25dB Min. BOdB Typ.
20dB Min. 30dB Typ.
15dB Min. 25dB Typ. Conversion Compression IdB Max.
fL 2,8 to 5.35GHz fL 4.5 to 5.35GHz fL 3.6 to 4.56Hz fL 2.8 to 3.6GHz
fR Level +2dBm
Flatness .2dB Peak to Peak Over any 40MHz Segment of fR=3.7 to 4.2GHz
Third Order Input Intercept +ndBm fRl=4GHz fR2=4.01GHz Both at -5dBm fL=4.5GHz Group Time Delay .5ns Typ. .75ns Max. fR3.7 to 4.2GHz fL 3480MHz @ +13dBin
|
VSWR |
L-Port |
1.25: |
:1 Typ. 2.0:1 |
fL |
2.8 to 5.35GHz |
|
R-Port |
1.25: |
:1 Typ. 2,0:1 |
fR |
3.7 to 4.2GHz fL fR |
|
|
1.4 : |
:1 Typ. 2.0:1 |
fR |
3.7 to 4.2GHz fL fR |
||
|
I-Port |
1.5 : |
:1 Typ. 2.0:1 |
fl-- |
=100MHz |
|
|
1.3 : |
:1 Typ. 2.0:1 |
fl = |
=500MHz |
||
|
1.8 : |
:1 Typ. 2.5:1 |
fl = |
^1125MHz |
||
|
SGS/ATES RF Transistors |
Motorola RF Transistor |
||||
|
Type. |
BFQ85 |
BFW92 |
HRF901 2N6603 |
||
|
Collector Base V |
20v |
25v |
25v 25v |
||
|
Collector Emitter |
V 15v |
15v |
15v 15v |
||
|
Emitter Base V |
3v |
2.5v |
3v 3v |
||
|
Collector Current |
40ma |
25ma |
30ma 30ma |
||
|
Power Dissipation |
ZOOwM |
190mw |
375mw 400niw |
||
|
HFE |
40mi n . |
200max. |
20min. 150max. |
SOmin. 200max. 30min. 200max. |
|
|
FT |
4GHZ min. 5GHz |
max. 1.6GHz Typ. |
4.5GHz typ. 2GHz min. |
||
|
Noise Fiqure |
iGHz 3dB Max. |
500MHz 4dB Typ |
^ |
IGHz 2dB Typ. 2GHz 2,9dB Typ. |
|
|
Price |
$1.50 |
$1.50 |
$2.00 $10.00 |
||
|
National Semiconductor Vari |
able Vo |
Itage Regulator Sal |
e !!!!!!!!! |
||
|
LM317K |
LM350K |
LM7236/L |
LM7805/06/08/12/15/18/24 |
||
|
1.2 to 37vdc |
1,2 to |
33vdc |
2 to 37vdc |
5. 6, 8.12.15,18,24vdc |
|
|
1 . 5Amps |
SAmps |
150nia. |
lAmp |
||
|
TO- 3 |
TO- 3 |
TO-lOO/TO-116 |
TO-220/T0-3 |
||
|
$4.50 |
$5.75 |
$1.00 $1.25 |
$1.17 $2.00 |
P & B Solid State Relays Type ECT1DB72
*May Be Other Brand Equivalent
Toll Free Number
800-528-0180 (For orders only)
5VDC Turn On 120VAC Contact 7 Amps
20Amps on 10"xl0"x.062" Alum.Heatsink with Silicon Grease $5,00
(fVI^jz electroi|ics
182 73 Magazine • February, 1 982
iC
MIXERS"
WATKINS JOHNSON WJ-M6 Double Balanced Mixer
LO and RF 0.2 to 300MH2 Conversion Loss (SSB)
Noise Figure (SSB)
Conversion Compression
IF DC to 300MH2 6.5dB Max. 1 to 50MHz B.5dB Max. .2 to 300MH2 same as above 8.5dB Max. 50 to 300MH2 .3dB Typ.
$21.00
WITH DATA SHEET
NEC (NIPPON ELECTRIC CO. LTD. NE57835/2SC2150 Microwave Transistor
NF Min F=2GHz F=3GHz F=4GHz
dB 2.4 Typ. dS 3.4 Typ. dB 4.3 Typ.
MAG F=2GH2
F=3GHz F=4GHz
dB 12 Typ,
dB 9 Typ. d8 6.5 Typ
$5.30
Ft Gain Bandwidth Product at Vce=8v, Ic^lftna. GHz 4 Min. 6 Typ. Vcbo 25v Vceo llv Vebo 3v Ic 50ma. Pt. 250niiw
UNELCO RF Power and Linear Amplifier Capacitors
These are the famous capacitors used by all the RF Power and Linear Amplifier manufacutures and described in the Motorola RF Data Book.
lOpf
14pf 20pf
22pf
25pf 27pf 27.5pf
30pf
32pf 33pf 34pf
40pf 43pf
62pf SOpf
lOOpf 120pf 180pf 200pf
250pf 1 to lOpcs. .604 each
820pf 11 to 50pcs. .504 each
51 to lOOpcs, .404 each
NIPPON ELECTRIC COMPANY TUNNEL DIODES
Peak Pt. Current ma. Valley Pt. Current ma. Peak Pt. Voltage mv. Projected Peak Pt. Voltage Series Res. Ohms Terminal Cap. pf. Valley Pt. Voltage mv.
mv
Ip Iv
Vp
Vpp
rS
Ct
vv
Vf=Ip
MODEL 1S2199 9min. lOTyp. Umax. 1.2Typ. 1.5max. 95Typ. 120max. 480m1n. 550Typ. 630max 2.5Typ. 4max. 1.7Typ. 2max. 370Typ.
1S2200 ^^'^^ 9min. lOTyp. Umax. 1.2Typ. l.Smax. 75Typ. 90max. 440m1n. 520Typ. 600max 2Typ. 3niax. 5Typ. 8max. 350Typ.
FAIRCHILD / DUMONT Oscilloscope Probes Model 4290B
Input Impedance 10 meg.. Input Capacity 6.5 to 12pf . , Division Ration (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
MOTOROLA RF DATA BOOK
List all Motorola RF Transistors / RF Power Amplifiers, Varactor Diodes and much much more.
PRICE $7.50
Ton Free Number 800-528-0180
(For orders only)
^/i*^x electroi|ic$
i
t^See Ust of Aavernsms on fiOffe f t4
73 Magazine • February J 982 163
"SOCKETS AND CHIMNEYS"
EIMAC TUBE SOCKETS AND CHIMNEYS
|
SKUO |
Socket |
|
SK406 |
Chimney |
|
SK416 |
Chimney |
|
SK500 |
Socket |
|
SK506 |
Chimney |
|
SK6Q0 |
Socket |
|
SK602 |
Socket |
|
SK606 |
Chimney |
|
SK607 |
Socket |
|
SK610 |
Socket |
|
SK620 |
Socket |
|
SK620A |
Socket |
|
JOHNSON |
TUBE SOCKETS |
$ POR 35.00 22.00 330.00 47 . 00 39.50 56,00 8.80 43.00 44.00 45.00 50.50
|
SK626 |
Chimney |
|
SK630 |
Socket |
|
SK636B |
Chimney |
|
SK640 |
Socket |
|
SK646 |
Chimney |
|
SK711A |
Socket |
|
SK740 |
Socket |
|
SK770 |
Socket |
|
SK800A |
Socket |
|
SK806 |
Chimney |
|
SK900 |
Socket |
|
SK906 |
Chimney |
$
7.70
45.00
26 27 55
192 66 66
150 30
253 44
40 50 00 50 00 00 00 80 00 00
124-115-2/SK620A Socket 124-116/SK630A Socket
$ 30.00 40.00
124-113 Bypass Cap. 122-0275-001 Socket (For 4-250A,4-400A,3-400Z, 3-500Z)
$ 10.00
10.00
2/$15.00
CHIP CAPACITORS
.8pf
ipf
l.lpf
1.4pf
1.5pf
l.Spf
2.2pf
2.7pf
3.3pf
3.6pf
3.9pf
4.7pf
5.6pf
6.8pf
8.2pf
PRICES
I to 10 -
II to 50 ■ 51 to 100
lOpf 12pf 15pf 18pf 20pf 22pf 24pf 27pf 33pf 39pf 47pf 51pf 56pf 68pf 82pf
.99* .90* .80*
|
lOOpf* |
430pf |
|
llOpf |
470pf |
|
120pf |
510pf |
|
130pf |
560pf |
|
150pf |
520pf |
|
leopf |
680pf |
|
180pf |
820pf |
|
200pf |
lOOOpf/.OOluf* |
|
220pf* |
lB00pf/.0018uf |
|
240pf |
2700pf/.0027uf |
|
270pf |
io,oaopf/.oiuf |
|
300pf |
12,000pf/.012uf |
|
330pf |
15,000pf/.015ijf |
|
360pf |
18,000pf/.018uf |
|
390pf |
101 to 1000 .60* 1001 & UP .35*
* IS A SPECIAL PRICE
10 for $7.50 100 for $65.00 1000 for $350.00
MATKINS JOHNSON WJ-V907: Voltage Controlled Microwave Oscillator $110.00
Frequency range 3.6 to 4.2GHz, Power ouput, Min. lOdBm typical, 8dBm Guaranteed. Spurious output suppression Harmonic (nfo), min. 20dB typical, In-Band Non-Harmonic, min. 60dB typical. Residual FM, pk to pk. Max. 5KHz, pushing factor. Max. 8KHz/V, Pulling figure (1.5:1 VSWR), Max. 60MHz, Tuning voltage range +1 to +15voUs, Tuning current. Max. -O.lmA, modulation sensitivity range. Max. 120 to 30MHz/V, Input capacitance. Max. lOOpf. Oscillator Bias +15 +-0.05 volts @ 55mA, Max.
Toll Free Number 800-528-0180 (For orders only)
(fVI^l^ elect roi|ic$
164 Z3 Magazine • February » 1982
ti
TUBES"
TUBES
2E26
2K28
3B28
3-500Z
3-1000Z/8164
3CX1000A/8283
3X25Q0A3
4-65A/8165
4-125A/4D21
4-250A/5022
4-400A/8438
4.400C/6775
4-1000A/8166
4CS250R
4X150A/7034
4X150D/7035
4X1 5QG
4X250B
4CX250B/7203
4CX250F/7204
4CX250FG/8621
4CX250K/8245
4CX250R/7580W
4CX300A
4CX350A/8321
4CX350FJ/8904
4X500A
4CX600J
4CX1000A/816a
4CX150QB/8660
4CX3000A/8159
4CX5000A/8170
4CX 100000/8171
4CX15000A/8281
4E27/A/5-123A/B
4PR60A
4PR60B/8252
KT88
0X362
DX415
572B/T160L
811
81 lA
81 2A
813
4624
4665
5551A
5563A
5675
PRICE
TUBES
|
$ 4.69 |
5721 |
|
100.00 |
5768 |
|
5.00 |
5836 |
|
102.00 |
5837 |
|
300.00 |
5861/EC55 |
|
200.00 |
587 5A |
|
200.00 |
5881/6L6 |
|
45.00 |
5894/A |
|
58 . 00 |
5894B |
|
68.00 |
6080 |
|
71.00 |
6083/AX9909 |
|
80.00 |
6098/6AK6 |
|
300.00 |
5115/A |
|
69.00 |
6146 |
|
30.00 |
6146A |
|
40.00 |
6146B/8298A |
|
50.00 |
6146W |
|
30.00 |
6159 |
|
45.00 |
6161 |
|
45.00 |
6291 |
|
55.00 |
6293 |
|
100.00 |
6360 |
|
69.00 |
6524 |
|
99.00 |
6550 |
|
100.00 |
6562/6794A |
|
100.00 |
6693 |
|
100.00 |
6815 |
|
300.00 |
6832 |
|
300.00 |
6883/8032A/8552 |
|
300.00 |
6884 |
|
300.00 |
6897 |
|
400.00 |
6900 |
|
500.00 |
6907 |
|
700.00 |
6939 |
|
40.00 |
7094 |
|
100.00 |
7117 |
|
175.00 |
7211 |
|
15.00 |
7289/3CX100A5 |
|
35.00 |
7360 |
|
35.00 |
7377 |
|
44.00 |
7486 |
|
10.00 |
7650 |
|
13.00 |
7843 |
|
15.00 |
7868 |
|
38.00 |
7984 |
|
100.00 |
8072 |
|
350.00 |
8121 |
|
100.00 |
8122 |
|
77.00 |
8236 |
|
15.00 |
8295/PL172 |
PRICE
$200 85
100
100
110 15 5 45 55 10 89 14
100 6 6 7
14 11 70
125
20
4
53
7
25
110
58
22
7
46
110 35 55 15 75 17 60 34 11 67 75
250 58 4 12 55 50 85 30
300
NOTICE ALL PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE !!!•!
TUBES
8462
8505A
8533W
8560A
8560AS
8608
8624
8637
8647
8737/5894B
8807
8873
8874
8875
8877
8908
8916
8930/X651Z
8950
6BK4C
6DQ5
6FW5
6GE5
6GJ5
6HS5
6JB5/6HE5
6JB6A
6JM6
6JN6
6JS6B
6JT6A
6KD6
6K66/EL505
6KM6 6KN6 6LF6 6LQ6 6LU8 6LX6 6ME6 12JB6A
PRICE
$100.00
73.50
92.00
55.00
57.00
34.00
67.20
38.00
123.00
55.10
1000.00
260.00
260.00
260.00
533.00
12.00
1500.00
45.00
10.00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 50 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1 1 1 1 1 1 1 1 I 1 1 1 1 1 1 H 1 1 1 1 1 n 1 1 1 ! 1 1
5.00 4,00 5.00 5. 00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.50 5.00 5.00 6.00 6.00 5.00 5.00 5.00 6.00
"WE ARE ALSO TUBES NEW/ US
LOOKING FOR ED ECT."
WE BUY SELL OR TRADE
Toll Free Number 800-526-0180
(For orders only)
^^^L? electroi|ic$
^See List of Adverttsers on page t ^4
73 Magazine • February J 982 165
"MICROWAVE COMPONENTS"
|
MIPfllJAVl COWGHEVIS |
||
|
All |
7tM |
HeiK SHmt |
|
ML |
7010 |
Mcive S«iffxt ,2 t« ?,«Olz |
|
JUL |
QTO^ |
ikiit« Source |
|
$11 |
orosi |
itolH S«yi1^ 7. OS 16 ]DGH£ |
|
Ml |
07091 |
ik>4K^ ^6yr?€ |?.4 to IB^t |
|
MM |
CUSZQK |
VaridbW Atirny^tor |
|
MM |
24)6-Z0 |
VtnaBle AttcnwiaEar Q-ZOdB .5 to l&il lObf |
|
jum |
I6H-60I |
Var tattle AtteniMtAr D-60cfB 1 to mii lOw |
|
AftW |
46S4-Z0C |
Vartat>1e Attcny^ator (}-limK I to 4GHr IDk |
|
AHU |
»e4^20F |
Veni&le AttemittDr O-ZIMB 7 to il£i^f |
|
Aifre* |
im |
SMpler Aticfiuitor 1 to Z&H 0 to SOd€ |
|
AHrtd |
U$2 |
SMfi1*r Attftiuitor 2 ta 4QU ti to SOdBi |
|
Alfred |
U51 |
SMvtkr AtC^mMtor 4 to SS^E 0 to 50dB |
|
jtomcofi |
aODD-6754 |
Adapter X to SMK S.Z to l2.4eKz |
|
JlKrican |
202D-fieOO |
Olrectioml Coupler .5 to IGKz edH |
|
Bow ton |
4i'4a |
PiM^r Dittctor |
|
CmxHiI Dyn«ii1ci |
30?:j |
Directional Powr Detector 60wfwJ/l^wrff^/2?5-40Cknc |
|
Coaxlil Dynmlci |
302S |
DlrectlOJiil Power Qe tec tar eQwfwd/i&wrev/ni-l'ianE |
|
FXR/Mlcrolab |
erw-A2i |
Coupler |
|
F)tB/>1tcfolab |
XP-AJ^ |
Crystal Detector |
|
FXft/Microlib |
SI 64 A |
ViriabU' Attenyatar 0~&DdB 2.^ to :].tSail |
|
FJtR/Hicrglib |
N414A |
Frei^ucn cy Wet#r 3.ff5 to llCHz |
|
FJtR/MiCfOlib |
G01A07 |
Adaptigr |
|
FWHlCrtfllb |
G£OLe |
Adactf- |
|
Gentril MkroMfVt |
N40EA-3 |
Power Detector |
|
General Mlcrcwave |
Nno-20 |
Directional Coupler 2 to 46Kz 2QdD li}D:l k>^vldtr ik tc Z5DW |
|
Serve rj J MIcrowivf |
4276-2 |
|
|
Heirlett PicUfd |
BZBIA |
Adapter d to « 5. 95 to 5.85Gc |
|
Htwyett PicUrd |
H^IA |
Ai^aprer h to i« 7. OS to lOGc |
|
Hnlett PAck«rd |
XZ91A |
Miptrr I to N fi.f to 12,46c |
|
Heir1«tl. Ptclttrd |
Hl292e |
kUoif'f IQ to t^Gc |
|
Hfiilecit PicMnJ |
NK292A |
Wapt«r IS to 22Gt |
|
Htkf1«tt PtcUnl |
»Si |
Motw Source If 3U/60HC |
|
H«if1ett P«cUnl |
fi347A |
Moue Source 3. »S to l.SSl&L |
|
H«Hl«tt Ptchjnj |
H347A |
MHt l4^rcc 7. OS to 10^ |
|
KChIeU PtChird |
5347* |
KD-lie Source ?.t to l^^SGc |
|
HtM]ett PKfcAfd |
tWM |
Moite Source S,? to lZ.4£c |
|
KNwIetl P«t*nJ |
MU |
itoit* SADTCt tOOlc ta 4Cc |
|
Htw^tU fictind |
3S5t |
Virt*b)e Attnuator . Sh DC to Ific |
|
HivlEte Picking |
MOD |
im Pn% FHter 4100^: |
|
Hptlett T>K4urd |
G3aZA |
VartAbU AtttAMtor 0 to 5IW 3.95 to %.^%c |
|
HMltCt ficfcird |
JJKA |
rariabte itiemiator o to sOdS 5.6S to &.2&c |
|
Umlrtt P*curd |
fsezA |
far»*6l* Attenuator 0 to SQiB 12.4 to laSt |
|
NwtfU Hcllt^ |
1»SA |
fertal^le Atte^LMtiir 0 to 50tf 8.2 to 12.4GC |
|
^icwTett PiCUrd |
41lA-^U> |
i rer for 411A |
|
Hsilttt PlckJird |
M«21A |
Crntal 5et«tor 7. OS to IDGc |
|
ftcwlett Piciard |
MI21A |
CrytUl Detector 7. OS to 10^ Kitched Pair |
|
HchIfU HcUf4 |
iM^a |
Crrvtal Dttcctot 7.05 to lOSc llitcrie^ Pair |
|
H&m\tt* Packird |
tT» |
therBHtor feunt For 430 SErrei IIM: to )06c |
|
Hi«f!flt Pitkir^ |
MftiA |
Mrritur Munt 1.9% ta ^.fiSSc |
|
ftWltftt P^KkAPd |
^ias» |
OcUctor Hnmt S.es to B.2Gc |
|
H^litt fackant |
JUGA |
TlWVlitor Houht S.SS to a.2&c |
|
Hewlett ^ftclbtrd |
nmt |
Th«f^ttor Hount 7. OS lo lOSc |
|
Hftflett f>iek4rd |
K«7C |
TI*ei^1itof "teufit It to 2Me |
|
HeifVvtl PicMrd |
PM7B |
TftiTplstor Hownt 12.4 to 185c |
|
Hewlett P*ck»(^ |
X4&7A |
Thiffllitor tount &,2 to l?.4Sc |
|
Hewlett pAckird |
I487B |
ThcrmHtor Hount S.2 to l2.4Gc |
|
H«ylBtt P«ckAr4 |
G&32A |
Freqi,»ene;y Heter 3.9^ t? S.flSGc |
|
Hnlett PicUrd |
H53ZA |
Frequertcjr Heter ?.a5 to 106c |
|
HMl«tt PftcUrd |
JS3ZA |
Freqijency Meter 5.3 to a.2Cc |
|
HpHlttt pAckird |
nS^M |
Frequency Meter 10 to 15Gc |
|
Hatlttt Packard |
P53ZA |
FrA^ucncy Meter 12.4 to iSGc |
|
Kevlett P«qlcarEl |
X532A |
Frequency Meter B.2 to l2.4Gc |
|
Hewlett Packarij |
536A |
Frequency Meter ,94 to 4.ZGc |
|
Htift#tc PAClcinJ |
G752D |
D^rectloriil Coupler 20da 3,95 to S.flSGc |
|
Kiwl#U Packard |
Xr52A |
Dlfectlotial Coupler 3<ja 8.2 to l2.4Gc |
|
Hewlfrtt Packard |
J(752C |
Dli'ectlonil Coupler 1MB B.2 to L2.HiC |
|
Hewlett Packard |
17 KD |
Street lonal Coi^pler 2QdB S^S. to t2.4gc |
|
HnUtt PdCUrd |
7i£0 |
Ouil Olrectionil Coupler .94 to K97SSc 20iiB |
|
HcHlett Packard |
767Q |
Dual Dlrectlotial Coupler 1.9 to 4(ic ZOdB |
|
Hewlett Packard |
7870 |
mF«tton«t detector 1,9 to 4.1Cc |
|
Hevlett P«ck4r4 |
G91QB |
Tafirttittlon 3,95 to S.BSGc |
|
HewUtC Packard |
J1914B |
Moving Load 8.2 to I2.4Gc |
|
HevlttC P§QkMri |
ZS30A |
Senter O-^Elllitor |
|
McHlftt Pich«P4 |
35(13 |
Nkrowavc imiUh SOQii: to I2.4& SPSf |
|
Hvlett Packard |
843 lA |
Sandjiati Filter 2 to 4Gc |
|
HCMlett FKkird |
8416A |
Aandpast Filter B to l2.4Gc |
|
Healvtt Ptckird |
«7lA |
RF Detector |
|
Mpileti Packaif4 |
$4TZA |
Crrsut Detector .Oi to 18&: |
|
Hotflett Packard |
SfWk |
Pin Hodiilatior l.S to 4.S6c SOa |
|
Hotlett Packard |
«}J3A |
pin Nadwlat^ 3.7 to &.!&: 3SA |
|
Mariett PacUN |
lOlOOB |
l«r*tfMtlQft no otai |
|
Hewlett PkUp^ |
IDSS5A |
Pr«a^p. / to inoic |
|
HHlctt ficure |
Il6bDA |
Trtcklfif G#neratiir SNmt |
|
fl«ifl«tt'^acUP4 |
IJfcgiA |
Lf»Her |
|
H«lEtt Packard |
DiKI |
frantHtof Tett Jig |
|
>*HUtt ^atkard |
33Rnc |
Hh Absorptive Nodylator |
|
PalBtt Fatfcard |
93110* |
mcfwive Switct) iOGnc ctp iemt |
|
Mskleit PacLtard |
PS-IWl?* |
■HcrOH^ve Saltch DC to iBGc SPQ^ |
|
HfwUtt Pacur^ |
3909eA |
HtcrCM4«e Swittft |
|
Uf |
KJ-Qi'437n |
0 t4 lOldfi variable Attenuator DC to I&C |
|
Uy |
woai |
Itolili Source |
|
El/ |
7921A |
Noise Swirce 10 U MWc |
|
Kiy |
7921A1 |
iolsc Soiree 10 to tOOQMc |
|
Lectronk |
K53A |
Tube Ht^.Mttenuator And 2ft2S |
|
ML |
WLU^e^l |
t Band Lu-d |
|
PCCA |
7H-1S? |
Directional Coupler 4 to 6&c 20dO (flarda ^Q44ft20) |
|
mrrimtHi |
AU-2fiA/ |
SO 1162 iTirlablc Att«iuator |
|
Hicrotech |
fl49?Z |
Mkfowave Switch |
|
HlUUry |
AT-ea/ijPH |
Horn Aflienna ft. 5 to 9,66e |
|
Hllltarjr |
U[S-52a/U |
MB Attenuator |
|
Minla |
703 |
Variable Atte^udtor 0 to 40da |
|
NinSi |
79ZFH |
Variable Attenuator 2 to 2.5Sc 0 to l7dB nU. £.5 to 12.4GC 0 to 20dB nln. |
|
Mtrdi |
2301-20 |
Directional Cojipler 2 tQ 4Gc: ZCMB |
|
lUr^* |
2301-30 |
Directlofiil Coupler 2 lo 4Gc 3{MB |
|
Mtrdi |
2366 |
Var1al}1e Directional Coupler 1.2 to r.4Gc 7 to 12 |
|
Ntrdi |
2EG3 |
|
|
Htnda |
28« |
|
|
NirdA |
2979 |
BlOlrectlonal Coupler 4 to SSc 20dfi |
|
Ninii |
3002-10 |
Directional Coupler .95 to ESc lOdB |
|
Narda |
VKl?'2d |
Direct locitl Coupler .S5 to 2Gc ZOdfl |
|
Hanja |
30G3-1D |
Directional Coupler 2 to 4&; lOdB |
|
Hir4i |
3003-30 |
OlrtctlOMl Coupler 2 to 40c JOdB |
|
iti^i |
30W-KJ |
(Hri<t1o^«l Coupler 4 to lOGc IWfi |
1100.00
100.00
100-00
ISA.OO
200.00
IDO.OO
50.00
50.00
75.00
75.00
200. oe
ZOO.OQ
JM-QCi
7S.0O
75. OO
?5.0O
5Q.0O
50,00
3^.00
35,00
450.00
450.00
35.00
35.00
lOO.OO
75.^W
35.00
50. OQ
15. DO
3S.O0
75.00
7^.00
200. QO
^50. 00
250.00
3E5.00
Z50.00
300,00
tfO.OO
so. 00
^00. 00
soo.oo
350.00
3ZS.00
J5.00
50.00
200.00
400^00
75.00
85.00
ISO. 00
50.00
IJS.?^
155/00
65.00
SS.OO
100. DO
500.00
4O0.D0
500.00
400. OD
3SO.O0
600.00
200,
200.
200. OC
200.00
50.00
50,00
200.00
?5.Da
100.00
50.00
IDO.OO
200.00
2DO.00
7S.0O
1D0.00
400.00
350.00
2S.00
eoD.oo
SD.OO 3flO,00 150.00 lOC.OO 100.00
75.00 100,00 100.00 250.00 200. «} 250 00
50.00
sa.oo
100,00 75.00 50.00 25.00 35,00
100.00
250.00
100. OQ
100.00
40,00
too. 00
100.00 100. QO 100. M 100. OO 100.00
.00
oa
166 73Mag3zinB * February, 1962
cc
TEST EQUIPMENT
JJ
loon ton
OK
Alfrgd
SyEtron Ogmrter S Infer
Po1«r«4 tHilinmO
rtcvltit Pi£Urd NiMltte PlCkAi^ flMTttt fiekird Haiti vie PAir44r4
Z3fM
Hi«ll'l«tt
WW leu
HtvUtt
wt^lett Hewlett
Hmtett HmUu Heyl ett
Hewlett Hewlett tt*wletE
Ptci.4r^
Ptcfcftrd
Packird Pdckird PackdriJ
Packard Pdckard Pdckarij
Hewlett Piduird
Hewlett PAckord;
Hch-Utt
Meviett Hffilett «e*il*U K«ilitt hfiilett Hewlett He«Tett i^ewlett Hewlett
Hewlett
Ptck^rd
Ptc kirt Ptcurd
fKktft
PtClcjrd Pickjnd PicUf^
Hewlett ^i^UH Te^tronii Hicro Tel TekironlA
T£5I tOmPtgifT
Z02J AN FM Si anil ^neritur 195 ccr 77Mli CIO^OO 2a7J/Z07H AM FM Slgnil ^^neritar jnd Un^verter
lOOKHi CO 55HC Ai^d 19S to 270Mc 600.00
?3i Het«i*odyiiB Cchn verier 200 ta UOOrtc £00.00
HCH5 NOfiUOr 750.00
eOOD/7D&L Swe«p Nctworlt Analyzer lOOKNf to 40Ge AOO.OO
KSG'ZZS^A Stindird Signal Generator F^r ZS ?^O.Q0
FW3 Frwiuency Meter 20 to lOOOMc 150,00 1037/ U9 1 A Frw^u«ncy Met^r 0 to SOHc wUh Plug ir^ td SOOHc 500.00 SPA3/?5A Spectfutii Arfl.lyzer IKc td ^5Kc And e Q-£ CainpianiOn
Sweep Senerttar 0 ta ISMc ^ni PS- 19 Powr Supply 1500. OD
6SB StaiKlird Sigttil Gefierator ?5Hf to 351^ 250.00
140 SUndifd Oevfatior; NEter IS to lOoOnc 200.00
KSa-Z Si|na] gcnerttor £l^ to «&00f1c 5A0.00
S?4 Hfcroweve Swept Oscil liter fl to l2,4Gc ?5a.OO
U(3^ T|»e Intersil Hug In fd.OO TS^lOll/ Wm* Spectrins tnalyi^r iWc to lOSc irilh
Alien Filler FJ35/F33fi/F3aT/f33e/F3*l/liac♦^ Aticfivatipr Cllin/C]t4WOI409 «mJ lEech Adapter
UGl?3W0GI24O/UG124iyifitZ4Z ISOQ.DO
StAAdind Signal CamrMtot IfiCc t» §IMc 300.00
Peiw Ai^iHner 10 U MSMt i.5ii«tts 400.00
PtMCT A^Hfier 10 tc SOOfc i.iwtUf iOO.OQ
24IMI Smccp Qeneritor 4.5 to llOPto 4110.00
4iX vmi £0 70Gm7 400.00
4I5D sun Heur Z 50.00
41 tS PMcr Pleter lOMc to 40Gc ISO. 00
60«A 5tgnil Generator SOKHf ta frSHc TOO OO
£OeO SljAll Gen»rdt{}<^ 10 tD 42Qfle «O0,0O
6Q8C Si«^l Generator ID to laOHc SOQ>PO
60af S{9<v4^ Generator ID to 4a<Mc l$O0,OO
bOSF Sfgml Generator ID to 4S5Mt 1^00,00
6I2A Signil Generator 450 to l?J0Mc 500,00
ei4A Stgnd! Generator 90D to 210DMc BOO. 00
&16A Signal Generator Lfi to 4.2(iC 400.00
gl^B Signal Generator i.a to A.iQt: BOO. 00
file A Signal Gen ere tor 2.B to 7.6Gc 400. 00
^ISB Signal Generator 3.8 to 7.6Cc bOO.OO
&ZOA Signal Generator 7 to U4k ^QD.OO
62 ja Tett Sat 5925 to 775QH£ 5*>0,00
fi26A S4gnil Generator 10 to ISGc 2000.00
£2aA Signal Generatm- 15 to 2l<k^ 2500,00
94m Freqti^cy Ooubler Z6.5 to 40Gc 1000.00
J5»m Portable Teit Set lOOO.OO
5249. frmxitftdf Cdintter 0 ce 50llt 1000,00
525^ ^l(#g In For Above 20 to lOlK 100. OO
5252A Plvg Ift Fflf «e)Oif& lOO tu J5<3Wt ?00,00
52536 Plug In F«r itwv« 50 to 5O0Hc 150.00
52S4t PI 119 I fi For above 20QMc to 34c 750.O0
S2fiQA frti^tm^f Otvider to I2.4fic Tor atmre 1000.00
S^saA Hif9 Iff For above Tim Inteofl 100.00
53Z7B INM ifkd Freqyencj Pteter t& S5<ilc 150(>.OQ
01f5«3« H UAd Scwntor/Teat Set 7.t Cn 8.5Gc 1000. 00
491 !&o#ctn0) Afidl/ter Solid St4te lime tn 40Gc. 70QQ.G0
MSmOl HlcrD^ve J^ceiwer to 40ee DIgiUl RhAoiA 90O0.QO
l%fi ^tatiil fieneracor JSOttHj to SOHc 150.00
Telontc ?001 Sweep/Sl^riift^ Uei^erator ^^$t
J 305 5 to ISOOHc AuUlpleI.?/3^^5 1 to 20QdHc Varidble Hart(er,}34D AF /Output
AttCfiuttor 50 atiu,i3^iLi J^ DeteLtor,J3€OA Rite ModiJlatiofv.JJ^OOUplay Prcoesslng. lOOO.OO
TeloBlc 2003 Sweep/Slqtiat Generator Sj^tttn'S
3303 5 to SDOWt B weep. 3323 1 to 2000Mt VirJable Har1<er,3343 RF/Output 50 ohms. 3 340
flf Output/Attenuator 50 ohms ,3350 SF Oetettor.3360A Rate K)ElulitiQn«33?D Display
Praces&ing. 750. 00
(^^
Karda Hir^ Nirdi Njirdi
liarda Harda Harda H«rd« Nirda Hftfda Harda ftarda Mtrda iirdi
Nirda Kardla Harda Kirdt iirda
i«rii«
Pffi
rao mo
PftO pao Pro
Quantdtron
Hadar Design
Sage
Safe
Sage
Slwrry Hicroline
StDddart
Systron Danner
Tefetronu
Tcttroniii Tektranlt Telonfc Tekscam Trans to MaveTiFie Havel ine iitvetei MvlntcMl tt^.
Kaiiitfictiir^ ^ftO
Hewlett Pact*rti Hfvfett Pacta rd Hewlett Packard
Hewlett Paqkard
3004-20
3032
3033
3039- ?0
3040-20
3043-20
3044^20
3544S2n
3045C30
4035
22006/
22007/
£2011/
eaoii/
ZZVT 22SW
22539/
22574 2M§9
22«76/
l«0ft4.10 ClOE 17101 20M
sesA
C3414
sau
116001 Xfi2e4 SlOO A-?filOC
[Jl*3«
752-3
2503
7?53-S
l^Q]
9D515
[)&U19A
51
52
550
lUOA
DTrectional
Coupler 125 to 75Qftc ?0(JB
Coupler 240 to 5DOi4c 20dB Coupler 2 to 4Gc 20d& Coupler 4 to SGc 20dB Coupler 3.7 to B.JGc 2'OdB Coupler 7 to lZ,4Gt 30dB
Coupler 4 to lOGc 20dB Hybrid .95 to 2Gc 3de Hybrid 2 to 4Sc 3ija Directional Directional Di^ett■i^^n4l Oi recti anal Directional Directional Hybrid 3dB
3043-20 Directional Coupler 1.7 to 4Gc 20dB 3D43-30 Oirectlona) Coupler 1.7 to 4Gc 30da 3003-10 Directional Coupler ? 3003-30 Directional Coupler 2 Alllptei^ K to n B,2 to 12.4&C 4014-10 Directional Coupler 3 4015C1D OlnBctiona^ Coupler 7 4013C10 Direct iontl Coupler 2 to 4€f: lOcQ IHrcctiOtfiAl Coupler 2 to *Gc lOOB »ir^£iofii1 Coupler 1%.S t« 17.1&: 4014C« Directional Cwftler l.ftS to dEf fitfl 4015C30 OlrecticMiel CoipTer 7 143 l2.4Sc 30i« Olr^tional Coepltr t to IKc 300 ViFiable Atte4t4#iter S.S^ to B.2fic 0 to iOdl VAriablp AtteAu>atO^ 12.4 to ia& 0 t4 fiOdO Slotted Lire wUh Probe 4 to lOGc Frequenci' Meter B,2 to lOGc 90^ Twist l& to 2£.5Gc
to 4fic IDdB to 4Gc 30dB
£5 to s&c \om
A to inc lOtt
,00 00
00
00
t^vovter 7 to l0.6Cc
Crystal Switch
Tnermistor Mount 3*2 to 12,4Gc
fiodustub Tuner
Variable Attenuator
Directionftt Coupler
Coup^ er
Mixer
Directional Coupler 4 t.D SGc 3dB
Frequency Meter 5,614 to fl.2Gc
IDdB AttenuatOf
Tunable Detector IB to 2£.5Gc
Saaip^lng Nead
Saapling Head
Pulse Gef>eraCor Held
170 oiie V4H««te Attenuator TI!f4]7-34-SCDZ Bandpass Filter 5YF2S0-50O-1AA Ti#i«bl« Bandpats Filter 250 to SOOfc
*m70ioo sp&r swi tch
£01 Mapter I to TIC i.2 to 12.4«C
9009-10 ftirec:t3«»I CQUp\mr 4 to lOGc lOffl
5070 0 to 7«A Variable Attenuitur
2fr« *X to mm Viirit^le Attemiatar
^^»/33o^/
33oa/U0fiA
0OM
eo5c eo9e with
IQO.OC ISO. 00 150. CH]
150,00
125,00
100. 00
IDO.OO
150.00
125,00
150.00
100. DO
100. DO
100.00
100. DO
35.00
?5.00
B5.00
75.00
100^00
125.00
100.00
too.
7S.
ISO-
100. too. 00
125,00 50,00 75. CO 50.00
125.00 M.OO 50.00 75.00 fS.QO 25.00 50. ao
200. DO 35. Tin
JOOiiJi'
Can
Can
M^DO 15.00
250.00 25,00 3S,00
101.00 ?5.00 50.00
Frice
1250. «} JOO.OO 400. 00
809E btith
Detcriptloii
20 to ioamu
Standing Mave Pe tec tor And Hatched Le^d
Slotted tine SOOWii to 4Bij
Slotted line SOOitii to 46Hz
W6& Slotted lirre 3 to L2GH2/Ciei0e Slotted
Line 3,95 to S.aSOMi/JaiDB Slotted Line
5. as to e.2aHr/)(aiOfl slotted Line 8.2 to
\2AGHz/P&im ^latteil Line 12.4 to JBGHJ/
tZEiP, £ H2KtA Adapt«r/H)(?926 Tapered
Trans it1on7444A Prote 2,6 to laCHi/and d
447B Probe/HttlOB Slotted Line 7.05 to 10.5
BO£B Shotted Lirte 3 to l2GHz/Hai{)G
Slotted J-ine 7,0& to id.sghz/xsidb slotted
Line a.2 to l^.4G#1ir/HK?92@ Tapered Tranjition
H to X/H2ai* i K2&lA/^Wlth Probe. H^^l^ 5S0.0Q
900.00
Toll Free Number
800-528-0180
(For orders only)
electrof|ic$
(602) 242-8916
2111W. Camelback Phoenix, Arizona 85015
t^4^
t^See Ltit of Advertisers on page U4
73 Magazine • February, 1982 167
FULL LINE ALL PARTS & COMPUTER PRODUCTS
P.O. Box 4430M Santa Clara, CA 95054
Will calls: 2322 Walsh Ave.
(4QB) 988-1640
Samt div itilpmirt. Rrst Wrm pans only Factory t^td ClvajiJite«d mcni;v bach Quality IC's and o\im componefm at factary pdc^
ELECTRONICS
tNTfGRATED CIRCUITS
Phone orders only (800) 588-8198
■JK I.M»IAN<AH
LH3CibH LM11IH-N
JJ »4
CtMOUl
cmooft
CMOID-
4 116 ZDOns Dvntmic RAM B $15,40
ELICTHOMIC SYSTEMS KITS
A|lple Ptrlphtral Kiti
SERIAL I/O INTERFACE 0 to 30.000 tjauri. D T B . Input & DiilpuJ from rnonlt&r or basic, or usEAppla as IntuHtQfiiil Teimjnal, td orly (P:N 2^ SH.S5, Kit (P/N 2A) 151,25, Assembled [P/N
PHOTOT^PrNG BOARD (P/N 79€7^ 121. H. PARALLEL TRIAC OUTPUT BOARD 8 inacs, each can swIEcti 11 QV ^ lo^dS. Bd only (P/t^ 2 'Oi S19 20. KMP N 21DA) $119.53. OPTO'ISOLATED INPUT BOARD 8 inpuls. can be driven from TTL logic, Bd only |PN 1201 $15,65. Kit IP N120Ali».»&. lAtf rtaci Hm
SERIAL PARALLEL INTERFACE Bidireetionai. Baud rates from ttO 10 19 2K. sw sateti^ polarity oi tnput and outpui strobe. 5 to Q di^ bits, 1 CH 2 flQp bits . parity odd or t vtn or none, all ctianctOT conlun a si^t bit. ^5 4 -12V required Bd only (P.N 101} %^^M. U {?H tQ1Ai S4Z.tl.
RS'232.ni IMTERFACE BM<rtclional. n- qufres rl2V. «it (Pm 23ZAJ tl.K. RS-23^'20l1lA INTERFACE BritifRt«ntL 2 Dassii« otfo-^oiilMl cktutts, m (PM T%m S1I.9S.
PROM Eraser
t\- ii.. 25 PROMs «n 15 (Wfiufes U*l?3vlolit, iSlcfTitiifrd 25 PROM capacity WM iwdh liRKi UB.^' 6 PfiOM cipKiy OSHkUL vef- lion S7t.SI) I wrth timer liOi.U)
NICad Battery Fixer Charger Kit Opans snorbBd cms tm won i ttoiid a ciiarpe ana j tiivi charges ft>ern up, afl in one hit w-lufl parts snd instructHHif . tS.ftS
Z80 Microcomputer
16 bit 1/0, 2 MH? clock, 2K RAM. ROM Bread- board space. Excellent for control HarR Board S2B.S0. full Kir 199.00. Monitor SZfi.OO. Power Supply Kit £35.00, Tiny Basic Ufl.U.
Modem Kit $60,00
State of the an, ori^., answer Ha tuning neces- ^ry. 103 compalible 3Q0 baud inexpensive acDusrio coupler plans included. Bd only S17.0C Article in June Radio E/ecfnon^cs.
60 Hz Crystal Time Base Kit $4.40
Conwrts Hiqnai clocks from A€ Ime frsqiaency to crystal time base. QjtstandinQ accuracy.
Video Modulator Kit $9.95
Convert TV s^t into a high quaJity fnonltor w.o atfectm^ usa^e. Gomp. hit wf ul^ mstruc
Mult}-volt Computer Power Supply
Sv 5 arnp. =18^ .5 amp, 5v 1 i anvp. by Samp. 12v .5 amp, -1?y option itSv. rllv aftf^^ilated BasicKit^S 95. Kitwitfi^ssis. antallhanhiarf SS1.99LAiMS5.0Qsh{p|iir)Q Kit of hard^re HLOe, Woot^grain ose $10.01. Si. 50 shqjping
iype-M4al1c by Votrax
1^ to speech synthesoif mth unlatiltad vocabu- lary, hmh-^ t&t to spMdialootiQvn. 70 10 100 Ms pe^ secoml sp«edi qraOMa^iBrp RS232C tmeil9ce (319.00.
1602 18K Dynamic RAM KH $143.00
£xpsnddbli Sq b^ Hdoen refresn M.tJob^ up v:- 4Wtw^tii^S^s.AdEl. 1»<RAMS25Q0 S-100 4-^ ecpansiOD $ 9 95
S4i|)er MofFhor Vt .1 Sou rce Ltitlao £ 1 5 00
RCA Cosmac 1802 Super Ell Computer 5196,95 '
The Soper Ell IS a smj^ single boari} GOrnputw i:har (toes many big ihirigs Ms an «ceiiflt computer lor tnming vtf fc^ ^anwig proTanrniig wih is machine fsngmoe m ^ its eis^ ea^nM wWt tillllonil nwnwry. Ftll Batlc. ASCII Ktfbovill^ 1M» ctiarader generatJOii, elC,
ROM fTunHoF; SMb imd Aitodft diSfA^S', SviQic step^ Opbonid adttress dtspbys; PtPMf Supply* Audio MtfMie' and Spfiton My si^Bbil tir ^ s. rui oocufiwfxXNin.
"^ &iar ar ndydes i HOH monitor tarpni-
g^r^koading, """t) rt rnnfttm Tritr WfTia F STff ^ pragnm dttHnlii wticfi Is not «- dhJded n oltiers at the sane price^ Wrtti SINGLE STEP you cm lee ihe micfopfocessor cihp oper- SBiQ Mth tfifl niqije Ouetf address vd dan tus disffai^ Mwt. 4imeg ifid Mv ^secutpig inr striKtons Abo, CPU fTVde and instruciioft t^de are decDdec a^ dkspHyed on a LB) ridicators.
An fCA la&t vk^ grapftio atp Hows you to DQtinK] m your o«vn TV Mtti an netpRns^ve video mniuMOr to do ira|ihic$ ^nd gams There e& 3 tpaiier iiiluii mduded (ik writing your onm m^tsic Of using many muse prpgram^ already wtitiert ttwsp&ker jimpiifi«rfliiyatobeiisedtd 6ttm ma^ lor control purposes
A 24 key HE^ ktytuard ^ndudt^s 1& t€X ksys piLS loatf, rts«t, nA, waH, ti^, memory poj/tad, monitor seiad ^nd itngle slftp Unje, on board
dispii^V^ piovide ouipul and optional littgh md low ■lUrwii. lhe\t is a 44 p^n ^ndaid cannector siot
Super Expansion Board with Cas
This Is truly an asioundioQ ^lue' Tttis t^rd fias
been designecl to allow you to decide ficw you want d optioned The Supef Expansioit Boanf comat wHh 4K or low power RAM lully address- able anywhsfe in 64K wrth buiH-ln memory pro- t^ and R cHSsafli lirieriaes. Provisions have been made for aij other optiois on Ihe same board and H fits neatly inta the iiardwood cabinet alongside the Super Elf Tfie board includes slcts Tor up to 6K of IPfiOM (2706, 2758, 2716 or It ?7l6] ^nd i$ lully sockeied. EPROM can b« u^ed for Hie monilor and Tiny Basic or other purposes^
A IK Super ROM Monilor SIS. 95 is available as an on hoard option in 2706 EPRGM which has been pFBpnsgnmmad with a prograni ioadfir/edilor and
error checking mult I fita cassette read /write soltware, {reiocjLjOie cassette lilel another exclu- sive from Quest It Includes register save and Foadout, block mowe capability and video graphics drtwf with blinking cursor Sreak points can be used with the register save feature lo isolale pro-
Que$l Super Basic V5.0
A new enhanced ver^tan oJ Supet Bai^e now avHilible. Quest wa^ the first corn par^y worldwide to shjp a M size Basic for ia02 Sysiems. A complete tonctton Super Sesic by Hon €enker including floating point capability wilti scienEific mitation t number range ± 17E*|. 32 bii inte^et ±2 billion: myib dim arrays, string arrays. Sitrlng manpilation; cassette LD. save and Icid, basic, data and m^hrne langitage programs and owr 75 statements, functions and operations H^tf improved taster vermin- ncludirig (t* nuntticF ^nd ess^nttalj^ unlimited firiihii. Also an exdusive user expanoad^e commind Liiifaiv Senaf and Paralt^t i o routines induded
Sii|ier flasic od (^ss«tte £55 00.
for PC CXI& anj a 50 pn csnwiQr slot Iqr the Quest Super Expansan Boird. Pomr supply and sudets for aO Cs 317 induded plus a dcniM 127 pg. msmxim imnat whiii now iidjdes over 40 pgs of sottMarv li^. {ndufiOQ a S8is o( lessons Ui hdp get you sorted wd i muse pro- 03n and gtapiks target ifsnt Itoiy schools and urvwfstKs are usmg the Sit^ @l ts a course of study 0B4 s use i tar trailing and Fl£D.
REfinndec other QonpitasDrty oObt Super B fabiEsdadifiian^Oosf ornottf il Conwan bribi« rou btiy, S^v El Kit $106.9$. ligi aMmu option SB.SS, U^r addnen o^ion SiJL teton> €^iK^ wtth dniKi wd taumn pie»s^tes foam p^Dij $2Aw£l Al metf &«armi CatNTiet piiiBd and sl( soeened. with foom lor 5S-1D0 boards and po«er supply 157.00. WCail OMenr Memoff Ssver Kii Sfi 95. All k3te and options liso Dompletely ass9n(M and fested.
duesjda^, a sottwai piiiUion lor ^802 oom- piigf users is avaiitile by subs^ipdon tor $12^00 per ^^ issuer, Srqie fasws Si 50. testes M2 bound SIB 50
MocM^ Videg Gr^i^ics S3.50, Sanes and Musio S3.0II Dup S liiW^^ SS.SO. Siarship 4K cas^ setlE WM.
Free 14 page brochure
ol complete Super Elf system, sette Interface $89.95
Qrarti bugs ^ms^. tf>en follow wtth single step. H you have the Super Expansion Boanl and ^per Monitor the monitor is up and running at the push
01 a button.
Other or* Doarti options indudf Penllel Inpul and Output Paris witli hill handshabie They aNow ea^y connection of an ASCII keyboard to the jnpul port, fIS 232 and 20 ma Current Lopp for teletype or other device are on boaid and If you need more mfifDory there are Iwo S-100 slots for static RAM or video hoards. Also a I K Super Monitor ^rsion
2 with video driver for lull capabilfty disp|:ay with Tiny Basic and a video interfeoe bqard PBrallol I/O Por^s $BM, RS 23? $4.50. TTT 20 ma l/F S1.95, S-IDQ S4.5a. A 50 pin conneclof set with ribbon cable is available at $13,95 fo^ easy con- nection between the Super Bf and the Sufwr Expansion Board.
Power Supply Kit for the Domplets syslem (see Mufti -volt f^jwer Supply below)
Reckweil AIM 65 Oomfiuter
6bii£' od:ieu Sim\t mam wnn tuLi ASCII keytioard arirt 20 Golymn rnermal pnmer 20 char aFjihanu' me IK display FiOM monfor Mly eaipandaUe I419.IW. 4K vgfiion $449,00 4K Assemtsier laSJOO BK Base Inferprdff SI&OO
Specyi nm^n power supply 5V 2A 24V .5A assem m trame ISV.DO, Molded pi ash c enclosure to fe boin aim fiS and power supply 55?. 90. MM 65 IK m caOt%1 wittt power supply swidi. luse. cord ^sem S55§ 00 4^ S579 OQ A^ ^SOOO AIM ^40 « 16t( HAM aitf mcfiilor $121500. flAM Boy- - ■ ^^^ ItlS^ iA IlISi VDWWdw S113.MJ. A&T
imM Comtme AIM 65 m Dftn bndc^e mm po«per sop9ily fSll.flO SpioaiPadcageFtice 4K
Ai¥. m Sue. poiKf ^m^ cabin:' unm
AIM 6S^iM,S¥M^upit Bf iM fy : - '"
Ell II Adaptfif Kit IZAM
P!u^ into EW II pmvid ir^ Supef EH 44 and 50 ptfi plus S-100 bus expansion (With Super Ex- pmsKMi) Huh and low address dispiay^. sta^ ifvJ mute L£Ds d^ioniJ S18.00.
Super Color S-10t) Video Kit $129 J5
BtparuS^sle to 2SG i 19^ higl] lesotutioo cofor gupfiics. 6047 wih il abpby modes oKnpviter ajftroied Memoiy nuppsf. IK RAM uiviS- aUeto6K B-100 biis 180? 800(1 SD85 Z80 etc Oulofs: Send iDf iiatl«ni pricifi§ margin pmgran.
TERMS: $5.00 min onfer US, Funds. Ctlii resldems add G%1ai,
$10 JO min, VISA and MasterC^rtt ac&epted. S1.0Q insurance opffiRiL Shipping: Add 5%; orders under S2S.00— 10%.
FREE: Send for your copy af our MEW 1981 QUEST CATALOG . Include 88c Stamp.
168 73Magazme • February, 1982
lansa^j the first name in Counters !
9 DIGITS 600 MHz $129
CT W Kit W da) pun t * 1^
HiiliTTlnir 1Li9
cnr I. taMto-ttrmt thm
The CT-9Q is the ma^r versitile, feature ptckti^dl cuiihter ivaLtable for leis ihvi $300,001 Advanced dcifti|n feituFes include; ihrec sekcuibk stat times, nine di|iu, gate indicAtor tnd ■ unique displiy hok) functign which huldi (he displsyed couni alter the input ijjnAl is removetf A\&<x m. lOmHzTCXOlJme bue is used which enibln euy zero hut ciJibritkiti checks tgiiiut WWV. OptiofiiJty; in ini«nuU nic&d b«ii«ry |i*ckctteiiL«l ttent b&te input MRd Mtcro^ power high stxbiliiy cryiul avta time bue are ivaiEabit The CT-90, peffdi'inance ym can count ool
SPECIFICATIONS:
WIRED
Rjuifc Seniitivity;
Reiolulionc
Diipliy! Time bue
20 Hi to 600 MHz
Less ihan 10 MV lo 150 MHz
Less ih^n SO MV l£) 500 MHz
O.J Hi (10 MHz range)
LO Hz (60 MHt range)
10 0 Hz {600 MHz nnge)
9 difjn 0 4' LED
SiMiKlarES- 10 000 mHi, LO ppm 20-4<rC
0|iaoiuil Micfo power ovei>0.! ppm 20-40'C
S-I5 VAC « 750 mA
7 DIGITS 525 MHz $99
SPECIFirATTONS:
Ftimie: Seiuitivity:
Iljeiolutioix
Dtipliyt Tune bti P^*ec
20 Hz to 515 MHi Uas thanSO MV lo 150 MHk Lc« than 1 50 MV to 500 MHz JO Hf {5 MHz rfingc)
IOO.OBmSOO MHi range) T(tiffm0 4" LED LO ppi!BTCXO20-40=C 12 VAC « 250 ma
WIRED
The CT-70 breaks the price barrier an lab quaJtty frequency count«n. Deluxe fealurei such as three frequency ranges -each wil h pre- BLmpliric it ion, duaJ Kleclible gatetimes^ and gate activity indication make measufeinents a loap. The wide ^nequency range enables you to accurately measure signaJi
from audio thru UHF with 1 0 ppm accuracy - thal't .0001%! The CT-TO it the answer lo all tout meuurvmeni ne«(js^ in the fteld. l$h or hatn shaclL
PRICES;
CT 70 wired, I yearwarranEy
CT-70 Kit 90 day parts *ar
ranty
AC- 1 AC adapter
BP>] Ntcad pack + AC
adapter/ chargei
S99.95
7 DIGITS 500 MHz
MJNIIOO wired, 1 year
wafTiJity %19.95
AC' Z Ac adapter for MINl^
100 13S
BP-Z Niead pack BAd AC
adapter,!' chjugcr 12,95
$7995
WIRED
Hef«'t a handy, generiJ purpof^e counter thai provides mo«t couniir funcLioni at aii unbelievabJc priceL The MINMOO doesii't have the fulL frequency rinie or Lnpui impedance qjiaJjtie& found in liigher price imiu, but for basic RF signal itieaiuremenu^, it can't be bead Accurate measuremenli can be made frnm I MHz all the way upfoSOQ MHz with excellent sensiuvity ttuoogliout tJw range, and the two gate timet let you seiect the moliuion defined Acki the nJcad pack af?uon and the MIN I- 1 00 makes an ideal addilioA to yoyf tool boi for 'in-ihe-fiel^' frequency checki and rcpain.
SPECIFICATIONS;
Range;
Seniitjvity:
ttesolutioEE:
Dupliy:
Tunc base
I MHz toJOO MHz LeiU than 25 MV 100 Hi{%ki^u'^} LO KHi(fiwi gate) 7 digjti. 0 4 LED 2.0 ppm 20^40 C 5 VDC 4 200 QU
8 DIGITS 600 MHz $159
WIRED
gPECIFICATIQNSi
Range: Sens 111 vityr
ResotutXHT
Diiplay: Tane base Pcrwen
20 Hz to 600 MHz
Leas than 25 mv to J 50 MHz
The CT'SO \% i verutile tab bench counter that wflJ meuure up to600 MHz with 8 digit preciiion. And, one of its brit features ii the Receive Fr&quency Less iha* 1 50 flsv 10 600 MHz Adap«r. which tunu the CT-50 into a digiul readout fof any receiver. The I 0 Hi (60 MHj ringe) ji ^r a ^ JL v.
TOO H iliOO MH I adapter ti easily proframmed lor any receiver and a simple connectMm !o the
B diam 0 4" LED receiver's VF O is alJ thai is required fof use Adding the recei ver adapiet in no
2.0 ppm 20-40 ~C ^'T Etm^ the operation of the CT-50, the adapier can \x convenjaitl>'
1 10 VAC or 1 2 VDC twitched on or ofC The CT-50> a counter thai ctn ^mk doubJe- duty!
FRJCESr
CT'50 wired I yearwuraniy
CT-50 Kii, ^ day pajfti
warramy
RA- i , ivGciver adapier kit
RA'J wuiedandpfe-profrajn-
med fsend copy of receiver
schema tic ji
SI 59.95
T 19,95 14.95
DIGITAL MULTIMETER $99^
WIRED
|
PRICES: |
|
|
DM^TOO wiml t year wtiiflfi^ |
S99,95 |
|
DM^700 Kit, 90 day paiu |
|
|
warranfty |
79.95 |
|
AC-1, AC adaptor |
393 |
|
aP-3. Nicad p«ck ^-AC |
|
|
idapte? charger |
19,95 |
|
MP-L Probe kit |
2.95 |
The DM'70C ol^feri prDfessional qualltv pterfornuince ar a Kc^hhytst pricr^ Features include; 26 different ranfpi and ^ Functiona, nil arranged in a convenieni, eauv to use format- Mruurements are diaplaved on 1 lar^ 3^ difit, ^ tneh LED rndout with jutomafK decimal placrfnrni. •uicTmaiic polarirv. ovrrrantfr (ndtcaOMOft and over load procccrion up 10 1 250 vc^ejon aJ| raitRA. makmg it vmualtv ffoof^fvoolf The DM-700 Looka ^etri. a kandsosne, fci Hadt. rifffped AftS caa* wnli coftvemenc fewaoafeJ* nk hail makes tt an ideal addition (o k\\ slia|i.
SPECIFICATIONS;
DC/ AC voha: lOOuV to 1 KV. 3 range*
DQAC
cufTcnt 0.1 uA to 2.0 Am|»&, 5 ranges
Rc535iance D. 1 ohms to 20 Metohnm ^ ranges
impedance IQ Megohins. DO AC vohi Accurwry: 0, J % basic DC volu
Power 4 C ceHa
AUDIO SCALER
For high resotuiio^ audiO measuremenuiH, niulUphej UP in frequency,.
• Great for PL tonei
• Multiplies by 10 or 100
• 0 01 Hz resojuiionf
$29.95 Kit 539,95 Wired
ACCESSORIES
Telescopic whip aAietuia- BKC plug. .«..«..*
High impedance pmbe, light toading
Low pas3 probe, for audio measure mentdi. .*^r Direct probe, general ^urpoie usage . . , , ^ , . . ,
Tilt bail for CT 70, 90, MINMOO
Cojor bui^t c;alib'rBtioii uniti calibratea counter against color TV signal
V 4' t V * a 4 I
S 7.9J 15.93 15.95 12.95
COUNTER PRE AMP
Fof measuring rxtremelv weak signals from 10 to LOOO MHs. Small *tie, fHiwercd hv plug ETnrLsiormer- Included,
• Flat 25 db gain 4 BNC Conneclort
• Great fo'' snifTing RF Hrjth p4ck-up Ux^
S34 95 Kit S44.95 Wired
remsey etectranic's, inc.
2575 Baird Rd. Penfield. NY 14526
S^
PHONE ORDERS CALL 716^586-3950
-%wran*r *« D Aia^-fliMM ftl 1 1 0 0-»-**« »dW I % COO a4*l
^5*tf List ot Advsrftsefs o/> if9g& tj4
73 Magazine • February, 1982 169
2822 North 32ncl Street »1 • Phoenix Anzona 8bUUB • PhGne602-9S6-9423
CHOKES
AND
INDUCTORS
4/1.00
.3uH .56 uH 1.8 uH
2uH 3.1 uH 6.6 uH
52 uH
55 uH
2/1,00 Z4mH 22 mH
MHIer 9055 50-120 uH
Summlta 20K359 455 kc discrfmination Miller #8e06/34H-650
TUBES
6KD6
6LQe/eJE6
6MJ6/6LQ6/6JE6C
6LF6/6MH6
12BY7A
2E26
4X1 50A
4CX250B
4CX250R
4CX300A
MINIMUM ORDER $10.00 NOT
4CX350A/8321
4CX350FM/8904
4CX1500B;8e60
811A
6360
6939
6146
6146A
6146B/d29B
6146W
6550A
^06
8950
4-400A
4400C
572B/T160L
7289
3-1000Z
3*500Z
82uH
91 uH 1B0uH 220 uH 270 uH 410 uH 450 uH
68 mH
$2.50
$2.50
* 5.00
6.00
10.00
6.60
4.00
4.69
29.99
45.00
69.00
109.99
INCLUDING
100-00
100.00
300.00
20.00
4.69
30.00
7.95
9.00
12.95
10.00
14.00
13.00
145-00
145.00
44.00
39.99
229.00
141.00
SHIPPING
500 pes. 1000 pes,
LED Diaptay FND 357, 362 red C.C.
TIL312 LED Display Red
Assortecf Heat Sinks— 3 each. For TO-3, TO-220, T(>66 & 105.
CAPACITORS
|
DIPPED SILVER MICA CAPACITORS |
||
|
5pF $.40 |
120pF |
$.25 |
|
10pF .25 |
150pF |
.25 |
|
12pF .30 |
210pF |
.40 |
|
15pF .30 |
250pF |
.40 |
|
20pF ,25 |
330pF |
.40 |
|
22pF .25 |
470pF |
.40 |
|
24pF .25 |
SOOpF |
.40 |
|
33pF ,25 |
560pF |
.40 |
|
50pF .25 |
620pF |
.40 |
|
75pF .25 |
82DpF |
.50 |
|
82pF .25 |
SSOOpF |
1.00 |
|
100pF .25 |
Quantity pricing also.
ASSORTMENTS
Electrolytic Caps.
All types (new),
50 pes. S6.99
GapacHors, Resistors & Diodes
Assortment
(All New) (Not Junk) 100 pes. 4.00
250 pes. 7.00
12.00
20.00
2/100
2/1.29
12/1.99
Assorted Potentiometers
*rAII new" not junk. Some with switch,
some with 1/4*' shaft.
#3.5.283 30 for 4.00
#S.S.284 100 for 10.00
New Miniature Toggle & Rocker Swltcti— 25mix. $6.99
New Assorted Toroid Cores
10 big & small 4.00
TO-3 and TO-66 Used Power Transistors High voltage switching in CRTs. 30 pes. Good/Bad? $ 2,00
100 pes. 10.00
Hardware Assortment
1 pound mixed screws, standoffs,
washers, feet, Insulator 5.00
IC Assortment
50 New IC's. Not Junk.
7400/S/LS Linear, DTURTL etc. $10.00
House numbered AYS 2376 Keyboard encoder chip— 88 (keys) same as OR 2376 6.99 each
5 Way DC Voltage Adapter Selective voltage: 6, 9, and I2VDC. input voltage— 11 5VAC $9.99 WALL TYPE TRANSFORMERS
115 VAC input
6 VAC @ 10 MA 2.99
12 V @ 700 MA _.. 4,99
15 V@ 300 MA. _,a99
115 VAC & 220 VAC input 15 V @ 300 MA. , , . . . . .3.99
DL-1416
4-Dig»t 16 Segment Alphanumeric Intelligent Display with Memory, Recorder, Driver $14.95 each
Fuse Holders
HKP type for 3AG J9 each
UHF Varactor Tuners— Sony
19.99 each
TeledyneSerendip
Solid State Dip Relay
Part#A641-1 2.49 each
RCA TRANSISTORS 80684
40235
AM PER EX/MOTOROLA
RF TRANSISTOR
BFR91 J5
MRF901 2.00
170 TSMagMzine • February J 982
RF Transistors
MRF203
MRF216
MRF221
MRF22e
MRF227
MRF23e
MRF240
MRF245
MRF247
MRF262
MRF314
MflF406
MRF412
MRF421
MflF422A
MRF422
MRF42d
MRF428A
MRF42e
MRF426A
MRF449
MRF44gA
MRF450
MRF450A
MRF452
MRF453/GE185
MRF454
MRF454A
MRF455
MRF455A
MRF468
MRF472
MRF474
MRF475
MRF476/C1306
MRF477
MRF4dS
MRF492
MRF502
MRF604
MRF629
MRF648
MRF901
MRF902
MRF904
MRF911
MRF5176
MRF8004
BFR90
BFR91
BFR96
BFW92A
P.OR.
31,00
10-90
12.65
3.45
12.65
15.50
34,00
34.00
9.20
20.70
13.80
25.30
36.80
41.40
41.40
46-00
46,00
15.50
15 50
12.65
12.65
13.90
13.80
15.00
17>25
19.90
21.83
16.00
16.00
19.90
1.00
3.00
2.90
2.90
11.50
3.00
23.00
1.04
2.07
3.45
33.35
2.15
8.00
3,00
3.00
3.00
2.10
1.30
1.65
2.20
1.15
eFW92
MMCMSid
MMCM2222
MMCM2369
MMCM2484
MMCM3d60A
MWA110
MWA120
MWA130
MWA210
MWA220
MWA230
MWA310
MWA320
1,00 14,X 15.65 15,00
15.25 24.30 10,00 10,00
laoo
10.00
10.00 10.00 10.00 10,00
Transistors
2N2e57
2^2857 J AN
2N2949
2N2947
2N2950
2N3375
2N3553
2N3818
2N3866
2N3866JAN
2N3866JANT)(
2N3925
2N394a
2N3950
2N3959
2N3960JANTX
2N4072
2N4427
2N4429
2N4877
2N4959
2N4976
2N5Q70
2N5071
2N5108
2N5109
2N5179
2N5583
2N5589
2N5590
2N5591
2N5635
2N5636
2N5637
2N5641
2N5643
2N5645
2N5S42
155
3.60
15.00 4.60 8,00 1.57 5.00 1.30 2,50 4.00
10.00 2.00
25.00 385
10.00
1 ao
1.30
7,00
1.00
2.30
15.00
18.40
20 JO
4.00
1,70
1.00
4.00
6.65
10,35
1360
10,35
12,00
15.50
9.20
15.50
13,80
8.00
2N5849 20.00
2N5942 40,00
2N5d46 19.00
2^5862 57.50
2N6080 9.20
2N60ei 10.35
2N6082 11.50
2N6083 13.25
2N60e4 15.00
2N6095 12.00
2N6096 15.50
2N6097 1 7.25
2N6166 40.25
2N6368 28.75
A210/MRF517 ZOO
BLY38 5.00
40280/2N4427 1,30
40281/2N3920 7.00
402e2/2N3927 17,25
MMT74 1.04
IC SALE
400CJ 36
2805HC/1405A 1.00
74LS27 25 P3101/82525/74S289 1.0O
SCL4013A/BE .25
MC14001BCP .25
MC14017BCP .75
MC14012BCP ,19
MC14023BCP .20
MCI 4027 BCP .39
MC14069BCP .39
MC14093BCP .60
MC3420P 1.00
MCM10152L 5,00
MC7408P .19
74LS05PC .20
AD580 1.00
8T01B .60
CH164A .25
CG388V .25
74LS20F .20
748SN .39
DS0026CH 1 .00
CD 4013BCN .30
CD 4028AE .49
CD 4040 BCN ,80
CD 4069CN/74C74 .30
MM74C74N .40
CD4015CN .75
DS/DM 8839N .60
DM75L51N .75
TL0-61CP .30
m
SN7420N .25
ZBOCPU 4.99
2708-6 1.00
2516/2716 2.50
2732-6 10.00
2102 .50
21 1 4-2 & 3 8/16.00
4104 a/16.00
D21 16/4116 8/18.00
D8257 3.00
MC6845 10.00
2S0CTC 4.00
280SIO/Oor/I 8.00
ZBOPIO 4.00
74LS273 .80
74LS373 .80
74LS374 .80
74LS245 1.40
74LS367 .40
74LS14 .60
7aM06 .39
78L05 .30
78L15 .30
78L08 .30
79L12 .49
LM317T ,1.99
MC7808T/LM340T-8 .49
7805/LM340T-5 .89
7812/LM340T^12 .89
7ei5/LM340TO5 M
7824/LM340T-24 .89
06202 20.00
D8212 1.00
D8214 2.00
8251 3.00
TMS1000NL 2.00
MC1306P .75
MC1414L .29
LM/SN 1458V .40
LM565V .30
LM309K/7805CK 1.00
MG6852P 3.00
RC74LS51N .15
SN74LS74N .20
PT 14826 2.00
EC1422B 2,00
LA 4220 Sanyo 1 .00
SN75427N .30
N8T28N/MC6889 1.00
D3232/MC3232 1,00
ORDERING INSTRUCTIONS
Check, money order, or credit cards welcame. (Master Cliarge and VISA only,) No personal checks or certified personal checks for foreign countries accepted. Money order or cashiers check in U.S. funds onfy. Letters of credit are not acceptable. C.O.D.— $2.25^-52 35 shipping.
Minimum shipping by UPS is $2.35 + .35 per $100.00 for insuranea Please allow extra shipping charges for heavy or long items.
All parts returned due to customer error or decision will be subject to a 15% restock charge. If we are out of an item ordered, we will try to replace it with an equal or better part unless you specrfy not to, or we will back order the item, or refund your money.
PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE. Prices supersede all previously published. Some items offered are limited to small quantities and are subject to prior sale.
We now have a toll free number, but we ask that it be used for charge orders only. If you have any questions, please use our other number. We are open from 8;00 am-5:C)0 p.m. Monday thru Saturday.
Our toll free nymt>er for charge orders only is 800-528-361 1.
MINIMUM ORDER S10.00 NOT INCLUDING SHIPPING
»^64
2822 North 32nd Street. »1 • Phoenix. Arizona 85008 • Phone602-956-9423
p'See List of Aifvefttsen art page f N
73Magaz(ne • February, 1982 t71
CALL TOLL FREE
3: c m
-I
o
IL
IS BACK!
Dentron Clipperton V
o
<
z
0*
2
S
m
Big power on 2 meters! Self-contained A.C. power supply 500 watts from 4-CX-250 B final CALL FOR SUPER SPECIAL!
Dentron RT-3000
Panasonic RF-3100
111
Hi
a
e
X
a
NAV369 95
AC/battery FM/MW/SW radio 3 1 band operation All quartz synthesized tuning 5 digit frequency readout Linnjted 2 year warranty
CALL NOW!
$299.95
< 0
III
Q
III
< C£ O
O
u
• 3Kw capability
• Roller inductor
• Power/VSWR meter
• Bypass capability
CALL FOR SPECIAL DISCOUNT!
$
%-r^
DM81 Dip Meter
Frequency range 700 kHz- 250 MHZ (7 band) Function — inductive coupling capacttive coupling Compact size
CALL NOW FOR PRICE!
i
CD
m
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X m 3]
"Our Most Popular Scanner the JIL SX-100"
o
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z
UJ
rNAV $399.00
16 Channels, 30 54 MHz; 140OB0 MH;; 410-514 MHz Digital Ciock Date Display 110 V AC or 12- 16 V DC
Seeh Rale Fast ^Och/sec Stow ScH/sec Bfight Green 9 Digii Ffequeocy Dis- play Ext Antenna Jack Exi Speaker Jack Large Top Mounung Bracket Scan Rale Fasi Sch.sec
Slow 4ch/&ec Scan Delay Time Variable 0-4 sec
UNBELIEVABLY PRtCED ATA LOW $199 95
^KEIMWOOD HC-1 0
Digital Clock
Attractive, functional layout, with switch buttons on slanted panel. Cabinet is trigonal pnsm shaped for stability. With a pleasing color cx>mbinatton and modern styling, the HC-lO will enhance the appear- ance of any ham shack.
CALL NOW FOR PRICE I
p
p
>
31 O
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5
>
Computer
Call for Discount Prices.
Amateur Radio
AMDtK APPLE
ATARI
BASE?
CENTRONICS
COMMODOflE
DC NAVES
NAZELIINE
LEED€M
MACRO T RON ICS
MAXELL
MCflOSOFT
MOUNTAIN HAROWAHE
NEC
NOflTHSTAR
pamasonh:
SANYO 5VNCOM
AVANTI SASH BOOKS eCAHCAT BENCH£R CALL BOOK CUShC«AFT OAIWA DENTRON
DRAKE
ETO
huSTlER
HV-GAIN
ICOM
KENIVOOD
MIRAGE
PANASONIC
ShURE
TEMPO
TEt£X
fRAC
tA£SU
aw
o
fll
5
ANTE£NNAS
PRICES SUBJECT TO CHANGE AND AVAILABILITY
OPIR . .
WE TRADE
WE EXPORT
C€NTifl
Nationally Advefiise<l Value
1840 "O" Street Lincoln, Nebraska 68508 In Nebraska Call (402) 476-7331 - a
V/SA
172 73 Magazine • February, 1982
LINKS •REPEATERS • THANSMIHERS RECEIVERS • PHEAMP8 • CONVERTERS TRANSCEIVERS • POWER SUPPLIES • PA'S
TRANSMimSs QUALITY VHF/UHF KITS
AT AFFORDABLE PRICES
FM-5 PC Board Kit ^ ONLY $159.95 complete with controls, heatsink, etc.
SAVE A BUNDLE ON VHF FIW TRANSCEIVERSf
1 0 watts, 5 Channels, for6M, 2M, or 220
4
<9
9
^
O
^^V^>%
\0'
V
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^«"
h^Z.y^'
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HIGH QUALITY FM MODULES FOR REPEATERS, LINKS, TELEMETRY, ETC.
• R75 VHF FM RECEIVER for 10M. 6M. 2M, 220, or commerdal bands. 4 fantastic SB[ectivity options. Kits from S84,95 to $ 1 1 9-95
• R45OUHFFMRECEJVERfor3e0-520MHz bands. Kits in selectivity options from $94.95
• R1 1 0 VHF AM RECEIVER Kit for vhf aircraft band or ham bands. Only S84.95.
COfl KITS With audio mijcer and speaker amplifier. Only $29.95.
CWID KITS 159 bits, field programmabre, clean audio. Only S59.95.
A1 6 RF TIG HT BOX Deep drawn alum, case wfth tight cover and no seams. 7x0x2 inches. Only $18.00.
SCANNER CONVERTERS Copy 72-76. 135-144. 240-270, 400-420, or 806-8 9 4 MHz bands on any scanner. WifectAested On^ $79.95.
TS1 VHF FM EXCtTER for lOM, 6M, 2M, 220 MHz or adjacent bands. 2 Watts contiiv uoys. Kits onfy S54,95.
T451 UHF FM EXCITER for 450 ham band Of adjacent Kits only $64,95.
VHF & UHF LI NEAR AMPLIFIERS. Use on either FM or SSB, Power levels from 1 0 to 45 Watts to go with exciters & xmlg converters. Kits from S69.95.
VHF & UHF RECEIVER PRE AM PS. Low noise.
VHF & UHF TRANSMITTING CONVERTERS VHF & UHF RECEIVING CONVERTERS
For SSB. CW. ATV, FM, ela Avaflable for 6M. 2M, 220,440 with many IF input ranges. Converter board kit only at $79.95 (VHF) or $99.95 (UHF) or kits complete with PA and cabinet as shown.
20 Models cover every practical rf and if rarvge to Nsten !o SSB. FM, ATV. etc. on 6M. 2M. 220, 440, and 1 1 0 aircraft band. Even convert weather down to 2M! Kits from $39.95 and wired units.
VHF Kits from 27 to 300 MHz. UHF Kits from 3O0 to 650 M Hz. Broadband Kits: 20-650 MHz. Prices start at SI 4.95 (VHF) and SI 6.95 (UHF). All preamps and converters have noise figure 2dB or less.
Call or Write for FREE CATALOG
(Send $2.00 or 5 IRC's for overseas MAILING) Order by phone or mail • Add $2 S & H per order (Electronic answering service evenings & weekends) Use VISA, MASTERCARD, Check, or UPS COD.
mironics, inc.
65Q MOUL RD, • HILTON NY 14468
Phone: 716-392-9430 ^3a
Hamtronics" la s reglstarod trademark
RAMSEY
ELECTRONiC'S •^62 Inc.
PARTS WAREHOUSE
We now have available a bunch of goodies too good lo hypass items are Jimiied so order today
2575 Baird Rd. Penfietd, NY 1452<
716-586 3950
MINI KITS - YOU HAVE SEEN THESE BEFORE NOW
HERE ARE OLD FAVORITE AND NEW ONES TOO.
GREAT FOR THAT AFTERNOON HOBBY.
FM
MINI
MIKE
A »upflf high p&rtDrmance FM wjre- tes$ rnlkt kit! Tranfimits a stable signal up lO 300 yar<f} with except TiOf^tl fiu(^«0 quality t>y means 4I tt;^ by^lt 411 decirei mike Kit mcJiudes case mikff o*i-off swrtlch int*nf>a bftttfffy irHJiupef tnifrucrions TfKiS IS me finest unit avatiainv
FM 3 Kit $14,95
FM 3 Wired ana Teklftd 19.»S
Cotor Orgafi
$e« music come alive' 3 d^ifferent tights llick^F 'Mvith musiC- On^ l^Qht eactt for, high, mid-range and lows Each indi- vidually adjust' ab^e and drives up !o 3O0 W runs on
Complete hit. ML-l $i.95
•ifw4*n Uv^ulmittT Kit StaMa luiUAit S ^^n» on S>-
Led BHnkf K\l A greai aitorntion get- ter which alternately flashes 2 Jumbo LEDs. Use lof name badges. buttons, warning pAMt lights ^iriythingi' Runs on 3 to 15 vO^tS Comp*ei« kti Bt-t %3M
Super Sleuth
A (ly per sensihv* ampl I - ti(?r which wiH pjck up a CMn {irop at 1 5 teei' Greai tor monitonnig baby's room ct &% general pur- posfl ampiifi&f Full 2 W rma output . runs on 6 to 15 wo' 15 u^es fl-45 ohm
speaker OomfMtB kit Bi^9
CPO-1
Runs on 3- 15^ VdC 1 wall Atamn. Audio Oscillator
cnit 1 KHZ qood tot CPO Complete kit tS-tS
Call Your Phonp Order in Today TERMSi Saiislaction gLaianitt?ed or monnj letunded COO add $2 00 Wllnfmum ofde S6.00 Orders iinUm $10 00 add it 1 SO Add b' lor pot»tayt;, insurance, hartdling Over-jt'd add 15*= N V re^idenis ddd /' la*
CLOCK KITS
Vchjf 0^ fSToritM are here tg^ln. Over T,OtlO Sold to Dele Wm orte at ifie Qan>g and ortler youn lodayt
Try your hand at buildcng the finest tookmg c^ock on the market >ts satm fifKsh anodlzed aluminum case looks great anywhere, whife six 4" LED digits provide a highly readable display This is a complete kit, no extras needed, and it only takes 1-2 hours to assemble Your choice of case colors: silver, gold, black (specify).
Cfock lilt. 12/24 hour. DC-S $24M
Clock with 10 mtn 10 timer 12>24 hour. DC-IO S29.95
Alarm cJock. 12 hoyf only. DC-8 129.95
12V DC car ctock, DC-7 S29.95
For wired and tested clocks add $10 00 to kii price
SPECIFY 12 OR 24 HOUR FORMAT
f M Wlreteta Mik* Kil
Trannmits up to 300' to
any FM bioadcaM ra^
iiio. uses any lype of
TYiike Runs on 3 to 9V
has added sensthve mtke preamp
stage
FM^I kit 13.95 FM-£ltit $*%5
Type FM-2
Unhfcrul Timer tttl
Provides the t»a$ic pani and PC |>oard f'^Qyired 10 providfr a source
at praciSiODi irmmg af<d pu^^ generation Use$ 5S5 timer IC and includes a range ol paria for moBi timing needs
UT-S Kit SS.tS
Whisper LiQhl Kit
An interesting kit, small mike picks up sourids and converts them to light The louder the sound, the brighter the lighl includes mike controls up to 300 W. runs on PO VAC Complete kM WL-t S6^S
Mad Blaster Kit
Produces LOUD ear snattenng and atterFttoo getting siren like sound Can supply up lo 15 watts of
ObfKSKioys ayflro Runs on S-IS VDC
Me-t Kit
S4^£
Tone Decoder A complete lone deco- def on a tmgle PC board Features 400- 5000 Hz adiuslable range via ?0 turn pot. voltagi? rr.j:, iation 567 IC Useful for toucfi- tone buj'st deiection FSK eic Can at^o be used as a stable tone encoder Runs on 5 to 1? volts Complete kit T{>1 $595
Car Clock
TTie UN- KIT. only 5 i»t^r eofineeltona
Sirefi Kit Produces upward^ a:nd downward wail characteristic of a |>oiice Siren 5 W peak nudto ouiput. runs on 3-15 volts, uses 3-45 ohm speaker Corrplete kit, SM-3 S2.95
00 Hj TlmnF QtM
Rii<n3 on §-M yE3C Law cufrBni |l)ini»i < iflin wortlfi JccuFKr TB-^ Wit U W
HeicB ft tupor laQkinq rugged Jind accurnEe kuio croch wh^cri \'i n tnmp to build aird ir^stnil Cloch movsnienT n cflmplelely aiiemhlitd - yot* oniif iOild*i+ 3 wnfe-$ and 3 ^witchi04 lAhM Eboij-l 15 mmLitiDi' Display la bnighr f^teen with lutomntic bfighrnest coriirQit E^inoiaceM — asfyief vclji ol 1 higfily Ftidftbtr display div ^^ itt^ht Co^e$ ^'^l Ht^n trmifi iAodi^^ii ^iMtni^MiTV CAt^ AtKcti can b* ftllacfted 5 diHirvnl wa^ysi>itg? t^ilvO iaf» Cnonet or s^pr ei«ich o' ^>d casa (icMcifvi
OC-3*<1 1?hQUftorfnai t21 •»
DC 3 «ifK] vvd tP5t«d
Cutcmdar Atarifi Ctock The Clock mat s tot it ait B- 5 LEDs i2?4hour loooie ?4 r^ou^' alarm J year caliendar itansiTy tjachup bdei JOIS mor« The super 7Q0i chip is UE&d Size 5K4K2 inchpF Complete kii less case [not ^^^a^iAbtei DCS 134.95
Under Oa«h C^f Clock
1:3 I^mMfcaK^t^AKaaypii^ -#«tu««i
a tu'^VOHil} LEDS luBtiKt- I., -1- "^1 attt
3 4M4 hdCNkiip. d<«pNlf b««n*.» *«Cn ^imttofi •mr
T„rtivf ii^iriicl^i>fl OpIiO'^Ai i^im-mHT aluomil^riilii •CJjMi'li ili^^ljir 10 At1^&)f ni 1-^)14 l««ll t>p. 1 1 eioeli wiil\ tfit{j bi^Llt'i^ fir n k,il
1>S/A 1 «)iiTim4r muAptVT HM
Add $1000 4«»v KhH T«tt.
PARTS PARADE
VIdffO Tfrmlnii
• ' • ' r 1*1 f c CHitsmpi"] irgrtft nhfun- atc^fio rr^rm ■ r-. i^* icemp^STi- tr'ffi.MiaiLiflii feai-j^es *■ -d IWlWOf temp J3U!»* i»''D prf&fi-
^-0tf and ^vfivrtf E i . : ^ aS^N p*ui fsaradg ^
»- 1 -- *^fi| Bfift comirttf ifn(tiii«><U4j<>
-MA«i etfffl kit itdd Me de hat
«»*
'■' ■ ■ ■Ft'?' trf
ffpUMif *SC<fh#rfrO*Ti3»"«:|TV
V^LrPE". rmritMkrd h-nc ai^d B«uil
_. The aii4<«fl«ttiJ> i>T ^fl><'<H win
HIM 114 fS
I'M
IC SPECIALS
LINEAR
38D
56€ 5#? T41
3it4 «3i
4»
t 3S
11 SO
II. ill
$ 49
tt» 11 M (1 90 in 2%
t so s se
I7 9S
%2K
4011 4013 404« 4049 4059 4511 451a
CMOS
Ifffi
.50 .50 $1.65 .50 $9.00 S2.0O 51.35 $1.75
READOLFTS
fNp»rrsio5CA %m
MAN 7?.HPrT» irC A 1»
Ni^fMi *rcA i.«
TRANSISTORS
jNim* »#M c* F 1 i^i da
7^4403 mp C^F IVII H
7nu,]oi#«iC*r 11.11011
JMBQtC*' 4«Mt
ztoTTi D^ii 5ACOA ti at HPN HKM trfw ^*f* fam.m
PHP 3»0i T^pf T>ft |«/»,M ?N:Wfi I.H
3iN»4e u^r l/4a.ee
TTL
74SCK)
7447
74n
7490
?4196
$ 40
$ .6S t.50
1,50 t1 as
SPECIAL
72oe
72C7A
72ieD
710TC
5314
a375AB/G
7001
115,00 S 1^ $1?,S0 $ 5.50 S2TD0 $12.50 3 2.95 $ 2,95 S 6 SO
FERRITE BEADS
'111 W
Soektli
14 Pin 10/S2 OO
16 Pm 10/Sa 00
?4 Prn 4/S2.00
?8 Pin 4/S2.00
40 Pin 3/$^.Q0
ficftislQr Aii'l AssorimenT of Popular values - % watt Cut lead tor PC rn hunting. ^^■' center ^o" leads, big ot 300 or
more.
$1.50
Switches Mini ic^gie SPDT Red Pushbuttons N '^
3
{too
it 00
r ivAdB
iafphones
ft of^m goQ0 tt)f vnm* ton* «tarmcic»cU Mc
f ofiifi 5p««itef ADpiQi « 1 di^m Hound
3 lor ia 00
Cvyitala
3&79&45 4UIHZ 11. SO
10 00000 MHZ tSOO
5 24BeaO MHZ SI.OO
AC Ad«p^l*n
cKv^ftfi.BK 110 VAC plug
Dllff «fKl
i5tlK#.20mA ft 00
16 VK # l€iOmA ft,M t2 TK # 2»^A tJ 09
i4«4 9I»I* Butxtn vmti buizer 4S0 hj M cfB lound DJalpul on &<17 vdc Ml 10^30 mA TTi epmpaiifelt |1,iO
Stug Tuntd Colti Small 3/16'^ H^x Stugs lurngd cqii aiurns, 10 for $1.00
AC Outlel
Panal Mounl with Leads
4/11.00
CAPAClTOftS
TAHTAlum
15tiF25V3/$1.00 1.8ijF25V3/ST.OO 22 uF 2SV 3/S1.00
ALUHINUH
>ClQO uF 1^ nadi^a^ t «a UO wf »V A>.Bf I M
lie w# irv Ajui Ml eo
DESK CEIIAMIC 91 1&V divk Ifrtt M < iSV 11 f 1 M
001 tiv n If ae Ocr«r
Plodat
5 t V ^enef M/H 00
lN914Type 50/5 too
tKV2Afnp ilVOO
tOOV lAmp IS^SI.OO
25 AMP
100V Bridge $1.50 each
Mini-Bridge 50V
1 AMP
2 tor $r. 00
PC-PC Cvnmtm Cer«mic IF FiltBfl
^5 flic ifKHrt pnya -9 vUc # 30ina Mini ceramic filt«ra t IcMz
'9r<ScerOiJuC«-lSwtfCi1S 3Sma 11.15 Q i^ 455 h;H2 S1 50 «>a
^SK 30 Turn Tc<m Pod |1 00 TK 20 Turti Tnm Poi 1 .SO
4E
Tnr»irn*r C*^ Spri^iui! - 9-40 pl
Siibl« Poiypropyltn*
Audio Preicalar
Maka high resolution audio rrieasurments. greai for musical instrumenl lunmg, PL tones, etc MulttplJes 9udm UP in frequency, selectable xlO or a 100. gives 01 HZ resolution with t sec gate hme' High sensitivity ot 25 mv, 1 meg input i and built-in Mlermg gives great per^OTmance Runs on tv battery all CMOS PS-2 kit $39.tS
PS'2 wire^ t^.9S
600 MHf PRESCALER
Extend the range of your counter (o 600 MHz Works with all counters Less than 150 mv sensitivity specily - 10 Of -100
Wired, tested. PS-IB $59,95 Kil, PS-IB S44.95
30 Watt 2 mtr PWR AMP
Simple Ctass C power amp features 8 times power gam. 1 Wirt for 8 out , 2 W in for 15 ouU 4 W in for 30 out. Ma n, output of 35 W, incredible value, complete with all parts, less case and T-R relay. PA-1 , 30 W pwr amp kH S22.9S
TR-1 RF sensed T-R relay ki! 6.9S
MRF-2MI 1fins43lor u uaed m PAO a-lOdb^tm T50fflh£ I11JS
RF actuated relay senses RF
(1W) and closes DPPT relay
For RF sensed T-R relay TR'1 KFt $6.flS
Ponvtr Supiily KII {,
Compi«ie triple re^uUfed oowm supply jpfOw«d^ vsriiibi« fi ID t i vti-Kf «1 200m«vitl-*^an Acnp £;i Calient I04ld rt^UilitiQn good Mt^fing nm) smaHl ti£t tewtrsmtoriner^ r«!quir«5S3V /# 1 A and 24 VCT Complete kit PS-3LT U^%
Cry Mil lllcrophont Small }" diameter 'a" Ihack c^y^EAl mike cartndge $,T5
Cfi«)t Cofm*ct«r
Chassis mount BNClype Sl.N
Mini RG-174 Coa* 10 It lor $1.00
Nice QuAiiry ti'&% s tw ft oa
%~ ^jMMf QiWl«in«is lOiortTM
A«l 0tC«VW» *e|C £4H IflM f-H4WiX ■in e«« I m pcT Vvm q Ug l}» {K^ ttJ»
Conn*c10f1 0 ^11 type go>ta£Dn1i»Cl» tor
pric4 7S ««
L»4i - your cht^ee ti>««se' specify
Mini Rftd Jumbo Red Hugh intensity fltd Tlfgimlriator Fted i/fl
Mini VeltOMv, Jumbo Yellow Jumba Green %/$i
V*i«cton Molorcta MV Z20d 30 PF Noinindl cip 20-90 Pf - Turiible ringi <
JO Hc*i Of 1/11 00
OP-AMP Sp*d«l Bt"FETLf 13741 - Off ect pin for pin 741 compatible but 500,000 MEG Jnpul 2. super law SO pa input curr«nit io* power dram 50 tot onty Si.Oa 1Q lor SI QO
7«MQ 71MG
7?3
7*05
11,25
isa
t* 15 Si DO
Rvguliitd-rt
7S12 7815 TvOft
7912
SI. 00 t1 OD tl.25 S1.25 S1.15
ftlwirtli Tubtfug Hubm
shnnh IQ' ■*" Gr^a! lor =p' -••', SO.'Sl.OO
iUn4 TO-42 HtH SInkt T^tttninQy 8r|i^d $ for t1 W
Tr,
?M HMf Sinfci
3 iw %im
Opto Isolators - 4N2B type
Opto Reflectors - Photo diode * LED
S.SO t«. SI. 00 M,
Mol«it Pini
WqIbm iJrBHjy preciit m i^rHjih cvf ? l^trfKl
cos lhNeloc«4li naitiiinc* vcnei wiin iigriT £5D ohmt ia ov«r 3 m*g 3 Ivr It.Ott
174 73 Magazine • February. 1982
i
i
i
"TOP QUALITY PARTS FOR LESS
It never fails: Someui-e calls you on the telupr.orit; .itnj yuu heeci to cliti-.w,u
' phones to get some infofmation. You put the phone down, go to another
phone and give them the information, then hang up. Oops! You forgot to hang
up the phone you first answered! No more phone calls for you until you discover
your mistake!! Or, the phone rings right in the middle of a serious talk with your
children, spouse, girl friend, efc. You have to lay the phone down, go to another room
to finish your conversation, leaving your caller in silence. Or how many times has one
of you r not-so-good friends asked you and your spouse to go out Friday night and you are
fl^^ 0 sitting there making all these weird gestures and rollmg your eyes. etc. Your spouse does
^■l^ not know whether to pour cold water on you or run screaming into the street. Well NO MORE
^^^ Digital Research is proud to announce the M.O.H-0,. the first patented, electronic hold control
for your home telephone Return to the same phone or any phone in your home and your party is
still there. All the time your party is on hold, they may listen to A.M.. F.M.. casette. T.V,, or any other device
you wish to hook up to M.O.H.O. No need to butcher your phone either. Only two wires to connect to your
existing phones. One wire to tip and the other wire to ring. For those not too telephonefCBlly inclined — one
to the red wire and one to the green wire. The M.CH.O, reisdes in an attractive box approximately 6" x 4" x
2", which may be placed anywhere. Now comes the fun part. You have just received M.O.H-0. (kit form takes
about 1 Vz hours to complete}. There are only two things to do: hook the red and green wiretothe telephone
and plugM,O.H,0, into A. C. outlet. Remember M,O.H,0. is completely legal, patented and FCC. approved,
(We provide you with a Registration Sticker too.) . -,. ihOft f%C
Kit i^du.uO Complete
(For rotary dial add S1 50 per phone)
Assembled and Tested $37.50
POWER SUPPLY TRIPLE OUTPUT 25 Volts @ ISA
5 Volts @ .8A
15 Volts @ 1.25A
Isolated independent outputs
Positive or negative operation
Constant Voftage Regu- lation
25 Volt line adjustable with 10 turn pot from 23,5 V to 28 Volts. 120 Volt - 60 Hz input Fused ■ H-3^^" W=5V' D=4''
Fixed Inductors
.39uh-6/1<**> 12.5 uh -8/1°° 500 uh- Hash Filter
(S 2 Amps ^ 4/1 °°
Molded Choke
l3uh-8/r^50mh^6/1^^ 1.2 mh 8/1"***
Precision Hybrid Oscillator Module
Has both 1 MHZ and 2 MHZ TTL - outputs —Hermeti- cally sealed —Ultra high stability over wide temp, range —originally cost over $40,00 each — we made a super purchase from a major computer manufac- turer — 5 Volt operation - fits standard 24 pin socket - Manufactured by Motorola oscillator division.
MC6871A
1 a %f*m
iM.
3/20
w/data
Variable Inductors
30-40 uh .9uh- 1.2 uh 11uhto20uh / ,25 uh- .35 uh ,85 uh - .95 uh
NEO 2137 by NEC
• Microwave R F. trans- istor (N.P,N,)
• Micromold Package #37
• Dual Emitter leads
• FT to 4.5 GHZ
• VCEO 10V-CC 20 MA. HFE 40-20Q
• Gain 10V'20MA' 1GHZ - 14DB Typical
• Very low noise - High gain 1.5 DB @500 MHZ
• Cleared for high reli- ability space appli- cations
COWPARE 1 ^'^
El AJ #18398
NEC #4981 -7E Microwave - Schottky
barrier diode
HP-Hot Carrier diodes
5082-2835
• It
*^ or 6/5°°
REGULATORS
LM309K *S V. 1.5 amp TO-3 1-00
LM120K -5v. V5 ampTO-3 1.00
7805 ^5 V. 1 ump TO220 1.00
7812 +5 V. 1 amp TO220 1.00
7905 -5 V. 1 amp TO220 1.00
7912 ^12 V. 1 amp TO220 1,00
UNIVERSAL
TIMER KIT
* Adjustable from 1 sec lo 1 hr.
* Control up to 1 amp *Tum Things On Or Otr Kit includes ail parts necessary to buiid this exciting kit Uses: Children's TV programs - Darkroom exposures - Amateur 10 mm ID er - Egg Timer - Inter- mittent Windshield Wiper, Absolutely endless uses. Complete kit including power supply, pc board DPDT relay, and all parts to make timer operational
$895
ORDER YOUR
TERNS
AU I |^4;f|fe if* pif h^inff (hiti% vtii^t IS i44 7S hioJiPf 1^4
idd 5^ Uf F&i^i^fl gr^rt |Cin»d9 lOx] t4ik 10^ PAH
• VISA • MASTERCARD - AMERICAN EXPRESS *
1982 CATALOG TODAY!
Digital Research: Parts
P.O. Box 401247 • Gsriand. Tm« 75040
(114) 271-2461
73 Magazine • February, 19S2 175
M SP€€I ALISTS • CUSHC Anf T • DRRKC - HUM HCV * HUSTUR • HV-GMN • ICOM * KflNTAONICS
w
*
3
a
8
8
2
1
SONY ICF2001
OUR BEST-SELLINQ MULTI-BAND!
i
D ^*
DIGITAL DIRECT ACCESS SHORT WAVE RECEIVER
• tSOKHz -30 MHz + FM BROADCAST
• PLL SYNTHESIZED WITH SCANNING & MEMORY
• AC ADAPTOR tNCLUDED
• 1 YEAR SONY USA FACTORY LIMITED WARRANTY
• AM/CW/SSB
• SURPRISINGLY AFFORDABLE
CALL AND ORDER YOURS TODAY
Kirog^tfji)
AS LOW AS
$n^50
94
• Wuiti-bano Muiti-trn^ucncy
• liUjtflnum etticie^Y — no tfips, toMfft^ cods m stuM
• Ftiiy iSscinUed in<3 p^^-lumtf — no measuring, no cuthng
• M i^cattitr mwi — 1 KW Ml. 3 5 KW £W or PEP SS3
• Proven perlcKmjnrt — m&re rt»an lO.OOO have Sef n dctivtfn) « Permit use of IM lull ca[»bilities of lodiay s ^band <cvrs
« Ont leedline lof operaiion on all Eiaixts.
Add $5.00
for shipping
(Cont I U.S.A.}
I
Eawsfb'^iper
SHORT WAVE BROADCAST RECEIVING ANTEHHA
* AUTOMATIC iANDSWItCHINQI
1
i
&0'40HD/A 80/40 Mtr bands (69). . . . 9t*00 75/40 HO/A 75/40 Mtf bands (66). . . . 94,50 75-10HD/A 75/40/20/1 5A10 Mtr (66). . 126.95 80^1 OHD/A 80/40/20/1 5/1 0 Mtr (69), . 1 32.00
AMECO ALLBAND PREAMP!
Our Most Popular Preamplifier
MODEL PLF2
$5295
plus $3.00 shipping
I
59
95
piit« f 3.00
■hippiinf]
(Conn U.5J
♦ COMPLETELY |wrATHEftPn0OF!
• coMPLrre, no assembly neeoeoi
• eO. 4S. 4K 31> 2S, tf, It. 13 ft ITM BAND$! ^«
Au the worlds *ftpiiiiia»i bnuacati isvids an r^^ri. Aiih thff Ejwidiopptf Alt Bartd *fl|«Ai>A. 4t^d<Yq3u»il|r hPied Iraprs itioi* lh* EAvHdrOMtftf
a iJiifflrBiir iriieniai^Dnai tiro«acd»t t*na Ais^ i7> cowrt It and 60V tiAndsAX wall U% tOO ruDl, 3^^
Dititi tMiancM teecntna- pro^idM m ft«Kt ma^h to ii^
S&sernbleti amU re»dy tO *Wlf#ll WItti » ft of <S0 ^j; tb lest ny+on rOptt Ov«tlll l^fltfltn 4l ItJ' Wtt i 14; copper cLad sleiH BindSMfifchiivg Autocrutic lifipsdArice to rcvr SO Tb ohmt t4)iMV«d
SI
^
*■ <^^'^r^^»^<'«'*^"'
TRANSCOM
PROGRAMMABLE SUB AUDIBLE TONE ENCODER FOR ICOM HANDHELDS.
$2Q95
MODEL PLF>2..Jmproves weak signals as trmch as image and spurious rejection of most receivers. Direct switching lo rec, or preamp. Includes pwr.
supp. 1 1 7 VAC wired & tested, , , , SS2.dS
MODEL PLF-2E...240 VAC 5060 Hz operation. . „ .
K'-f-taBAap«,|p«4«. ■■4.1. •>»*•!■«»■■** «-'-«-' « »«>'■■- m. »■ m Mi. A -m ^PWV «VV
MODEL PT*2...Fof iransceiver use. Continyoysly tunable iJ^om & to 160 meters. Features dtial-gale FET Ifanststof ampUfier for improved receiver sen* sitivrty and low noise figure. Requires no transceiver modifications and can handle up lo 250W transceiver 0ulpuMt7 VAC 60Hz. . , .$79.95 MODEL PT-2E...240 VAC 5060 Hz opera1ion$B4.95
ICOM WE'VE SOLD FM GEAR FOR 14 YEARS
& IN OUR OPfNfON ICOM tS.., "SIMPLY THE BEST"
I
Plus SZhOO
shipping and
Itnndling
•ONLY 1.1" X 55" X .2"
• PRESET OUTPUT LEVEL FOR IC2A
• LOW TONE DISTORTION LESS THAN 1% THD
• TONE STABILITY ± .2% Hz FROM -20G TO +70C
• 1 YEAR LIMITED FACTORY WARRANTY
• 5VDC POWERED
I . it
IC2A, IC2AT
OUR MOST POPULAR HAND HELD & THE BEST VALUE AVAILABLE
• COMPACT
• QUAUTY CONSTRUCTION
• VERSATILE
• AFFQFIDABLE
• WIDE RANGE OF ACCES- SORIES AVAILABLE
IC3AT (220 MHz) IC4AT (440 MHz)
IC25A
A LITTLE PACKAGE WITH A LOT OF BIG FEATURES...
• 26W OUTPUT • MEMORIES
* ENCODING MIC • SCANNING
CALL FOR PRICE & AVAILABILITY
f-
^
^ _^ rtnrifci-n ^^^^ ^R WRtTE. MASTER CARD, VISA, MONEY ORDERS, PERSONAL CHECKS TAKE 3 WEEKS
3 TO ORDERl to clear, accepted, international orders welcome, please request pro forma
m INVOICE,
HOURS:
MON. THRU WED. 9:30-6:00, THURS-FRI. 9:30-8:00. SAT 9:30-3:00
stop by and visit v\/hen IN the chicagoland areaii
5 8
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176 TBMagaime * February, 1982
SS££^Ut» Clock Modules
12V DC
AUTOMOTIVE/
iNSTRUMEfVT
CLOCK
API" LIGATIONS
• A1t*'-rfitri!*i #Liba/ HV ffoeiii
• .Airc#»l!T-miiFiiHi elki.
• Portibl^/l^aUiry povnetati init^umnti,,
F«gtiir«i:Brl^tit 0^3' cif»n diipliv. Internal cryttMl ll^mir- bl IB , t O.B ABE . /d»v Accu r,. Au ta. d I ipl4iv brigh t ntf^t can Ual 4oi|]ic, Qitpld^ CGlar fHi&rablt t^d blii^e, blue^greBn, graon^i
valloM. C^nvptete-juil add iWltC^n snd^ Iftnt.
MA 1003 Module [iw"LKi,ys>'HK.w"pj . $16,95
CLOCK MODULES
.7" PiwS Pigji^F LEO Cieck Moduli* ?" Gk3. LED Alarm Ci^HhrthwrmtMtrit^m
.3" Had Digiut LEO Cloch/Ttimer
,3*' RhI Digital LED CMlch: A XfOrmV ff - T^cd D>A»T«i LED C^oek
CSA J" Dil4t4J LCD CIdcJH
.7^' Graan Dlfiui LED Cicch
TTlAP4SF0Fl||£ltS Jl fornitnr ^Or M A T 0^ J. I DA3 & «)3e Mw*>t )Cf4^i>n«f for MAIC^ Cfoch Moctuin Xtormar ror MAIOTQ Clock *^odu«
|
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|
MAtOSQ |
|
KAAioai |
|
uAiooa |
|
MAtQIQ |
|
MAiOja |
|
MA104:i |
|
IBJ^JO |
|
IM P23 |
|
102-^2* |
MICROPROCESSOR COMPONENTS
SUPPORT a LV ICES
C^J
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Suf? Power Voof Etectronics! SOLAR CELL PANEL KIT
FaplMiat:
« Output: 10VDC, to ^mmtk irt Birlet
^VDC. ID 2D0mA In FaniJItl
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JE30S,
$3995
EPROM Erasing Lamp
Mm mm
- Eram J^Oi, 2716. 1702 A. &?03a 52040, ate.
> £faHt up 19 4 chipi wrihFRi 2<0 rnmutRL
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MlCftOPf^OCESSOR CHIPS'
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$79
JS4K
JOYSTICKS
JS ICWK lOaK Linwt Taper P«a . . JVC -40 40 K iZ) V^rtMo C9<T(re^lar il^
ALLIGATOR CLIP TEST LEADS
HlMn<!ulr baids. 'CdIof codaO- f nivfnlafl al Nq Blar tllp on luh lod 1 Q''' IMf.Tia9 iach b«HC»i. rfl*]_ bJus, whilw ur^d yelnow.
#ALCP 00 per pack) $2.95/pkg.
^'^ J E215 Adjustable
Dual Power Supply
GtrvinI 0«CfP|}tiOfi= Th| JE2!$ ti » Duel P««v«f^ Sunfiiy until tadgpewtwl MljLiitibtt poaitiHtvncf ncp i»vt twtpvn wllj|>A. A nptnti ntjinEiiiiiit lor etch Qt thi Euf^pliH |>fdvid4sih« utftf unlimiTTli f|lpl^tJortf For IC Cvrrvfit voltifi nqurtintntL Tin nipfily ctn llio IM u»i^ a$ • g«nvil tlF-pUT^OK vircttiit poiiivr
lUpplVn FEATURES
■ Adit/ttaD^arvBuiata^pCwaf tupplktt^ PQf. ani;] mafli I.^VDC t«i 19VDC
• Pewa' Ouipui taich fupplvl hVOC 9 SOOmA, iavcCl» 7S<lmA, 12VDCi»aC0rTiA. and ISVDCO t7BmA
•Two. atirmlnil idj. IC rii3i.tl itort With Thafftiil ovarioed prstactlon.
• H«Bifink i-tff^litor ce?oliiinu
• LiO "or\" Indlfiatnr
• Pi^Jn3*cl doard Conti'uCTlan
• 13DVAC 4nt3iit
• Sl««: 3 i/J-w » 6 t/ie "L f 3"'H
JEZUMj. Ou«l Poww Supply Kil (aiUitnwnJ . . SZ4.iS
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iJ^lilTlhrl Fjd^^v Oi*( CtmtTEi'iai'
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Full dsLB 9imBL'». niilt<i mdeib f pr InHl p«rlphar«t dautci
CDrnpnuDi^la 1044 (Ui(|Ak1
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AC and DC Wall TransfDrmers
WIUi UninvnaJ t^Mg *nd »V laltary trip
PotafHyi HiaMDB i^t^ W-fQat
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CONNECTORS
PBSSP P2041BU2
uaee,aj
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pLzse PLzsa
1JG260AJ UGtG94AJ
D-$ubminiBtuF« Plug
D Subm^nLvtuirv Sc^kaf .. . SE^av^LiM^ Hdwr, (2) OQ^&S/P OQvut tor DB25P/S .......
P.C Edfp J.22/44 Prill
Sf4C Ptufl . _ . _
aNC J^icfc . . . . -
UHF Adamar .... . . .
UHF Panai Racfi. ^ , i. * . . . .
UHF Afl4rtar .....
UHF Phf^ .... ........
BNC flufl ....,...•<..
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THt HOST UHlQUt CKP IWITCH AVAOAAiCl
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JE608 PROGRAMMER
17D4^2T0a EPROM PROGRAMWER
• To mrwmw^ EPfMMH XPVi
JE610 ASCII
Encoded Keyboard Kit
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Tlia JEGCB E>*F10IVI PruijrirTHTMr a a complaUlv MlP'SPnCalntd iMill'wtHOi itrndapa^anf. grcQinpi^rgprTtriiJ lUidTKiuirH no tddlilQrMi it^^iafni far \n atiat»\tf\r\a Th« 'E^FlOM cm'i b* prpf^mrnai riium mi NindHjImil Kaybotfrl nt ^^an a pm
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jE§OflK Kit ,,..--.- .
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I399.es $499.fS
JESOa-IOK ADAPTER BOARD
JfZOQHafrP^W ffS^PP^v Kiti^VOC. 1 ampi tt4.fiS
iE30SA4lp^Btil.!foJE200HS.-»& r12V S1Z,»S JE2?0V*f.Pwr Sptv Kpl.S^IBVOC.toT&a'Tip fifths
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Spac Shaali - 2&4
Sand BB* Pnilafl* lor ynur
FREE 1982 JAMECO CATALOG
^it^N
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J^V
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ameco
ELECTRONICS
PHDNC
ORDERS
WELCOME
(415) ssz-sag?
2/Ul
MAiL ORDER ELECfROSfCS - hORlDHWE
13SS SHOREWAY ROAD. BELMONT, CA 94002
PRICES SUBJECT TO CHANGE
.^30
Tna JEEIO ASCII Kayboard Kit can ba Inia'faoad tnio
rrvaii any cdmpUiar tyttam. Th* kit roiTiif Eomplata lyvitN an indutirlal D'lda kayhaard iw^tfih aiaamblv (fi2-K«v*L Id. IOC kali, cannactar, alactronlo compo- nanti Bod a dDublalldad DfifiTeiJ ui/lrlrijj bDtFct The kavbo-ard aiaat^rtjlv raquirt* ♦^V ^5* l&OmiA and — ISV 9 TO rr^A tar oparrlilon. Faatur«: SO kavt ^hai^ttt liha l^e ehafactan. upp*r amJ \tmW eaw ASCpJ lal FuHv Oulfi-rwd. TvMD uaaF'dalina kava prpvidad Tar custDm apDl teat jQ n«. Capa lacN for up0ar-caaa-4 1^ iv alpha Sftnc- T»T» ytiJiiai a 23 76 laO cinh «ncoc*w^ rai#d-DnP¥ iilift»fV <chi6. QuiDuu diracTlv eafTipwl3)la witti TTLJOTL or MOS Tf^sK affava Eatv ImlarfacJoi Mlth a 19 pin diD or
JEglO/DTE-AK ifiSJ^'^SSSi .. $124.&5
iccin I/*:* « ««¥ Kaytoard.Pcaoa^a. * tq qjt JEiDIUnlL .4 CQniiP^nanEf |oo casai . . . .^ /3*93
K62 &2-Kay Kayaoai'd (KaybDAtO an>y> . ^ -S 34.95
DTE-AK (cat* only - laii"MiclI"Wietai'*ojS 49.95
JE600 Hexadecimal Encoder Kit
FULL f^lT LATCHED OUTPUT 19 KEY KEYBOARD
trm JE€00 Enco4«r KavbO^fd KttprDwidai t#D hmMmawcimai dlfJta p'Oducad from taquannal KtY arnr^a^i ia a1{f3n/v difact prbfiramfnlnB for S bri rn tcrppf qcaiap f or B'bfl ma^'^Hirv ci'CMlIt- Thr*a addaionaP h«vi ara pra- vtdad for ijatr oparaltani wltti ona lucv^ng a biilabla OulpuT vvalPabla- T^^a ouTpuTt ara laTcrvao anU manitorsd with fl LEO I'aadOuti. Alio intPui^ltdivaiKay amry itreba. Fva^Mfiiiii: puPl fl-bit Patch^ output fgr mlcroproceiiar Uia. TNraa uiar-dlt4na kav> WhTfi on* b-llri(r OJfTabia Qpfli'ltlnin. Dabaunca cIrcuJt prOvldad (or all 19 kayi. i LEO rpacl<»uti to varltv antrJan. Eaiv Intarfaalnp iwlih iTand«fct Ifi pJfi IC coorwclPr, Dihlv *BVDC rv^yirad t^T {>ppr«tion Stra a^-l'H p 8W"VV ji Sii'O
JESQO/DTE^HK ji p<cui?td a&&»a) $99.95
Jt^QO Ktt PC eo«r4 «• Cmoritli. [fio caM) - $99 'TD K19 l^tivf KarDOard (Kay^Haarfl oniyl , . , SI 4,95
OTE-HK icHtontf 3i7''Hsd>»'-iw^i*"D3 S44.95j
TRS-80 16K Conversion Kit
Expand your 4K TR& BO Syitepi to 16K. Kkt CPITii( comptata wilh ;
* B aa. IViMe200 (UPD4l6/41ie! 10K Dyn. Ram (*NSl
♦ DoeumtntJitlon ivt Copivarakin
TRS-16K2 M&ONS ............... S29.95
TWS'16K3 *20t)NS ........,,,*,.. $24.95
TRS-16K4 *250NS _,..,,..,. Sl9 9b
f,/VAM^ JE2I3 - Naoativa 12VDC Adaptar Boird Kct ZNEWI? fof JE610 ASCII KEVBOARO KIT
Tv^vJ^^ Pro,wlaiJ-iSVDCtrOrTTiFlCOm|iirjS.VOC $9.95
'Se# jL^sf □/ Aiivefftsets on p^ge J t4
JSMagazme • FebruaryJ982 177
q)Em£R
DIRECTORY
Phoenix AZ
Uvua nxnpAnv stocxing Ke^nufiDd, from, \me%u. MR. B^W, Attno, Limn, Ctohcnli.
u-nt- vuu! FcTHirrConimiinicatHiHCorp., 1640
Culver City CA
\iaC\ EJkctjvmua, l^^l^ Sepuli^edA BK^^I, . Culver iiiy CA INIZ30. 3(K)-«0Q3. TrAckA4(ia-liiHaSHn |}ke|{Lt, CvJI us loi a law quotes.
Somer^t NJ
axid Yi^ESC djsiribi^biri LK^invTntDf% of ilrv> nod ttmd Tppriah Man mftjov bnmdb in liack C^J^lple(e wilier and UdlUiet. lt*dio» I ntimitad, ITfid EkIixi Awnov, F.O. Ben 34?, SonxEvt SI 06S73. 4@£M5g9.
Amsterdam NY UPSTATE NEW YORK
KniUTKicL IC:OVi, DtmIu, plus tfijiny mtlyt't ]j|w» Annttnjr Dea3CT-foro^"er35\T*f> A'djrtin- d*tk HkIki Suppiv, Inc. , 1S5 iVei Mijji !!itrwt, Amthfrdam NY 1^10. 842-5350.
Fontana CA
Com|ilclt' \\n&, rCOM. I>enTraii, Twi-Tap, Mirnftji^ Cubic, Lutmr, ovt-r 400U rkvEroriiL- |irofliKi^ Inr h«hb\is^ tech nici tin, i^xpcri- iMt'iitcr. ALmi IJli mdJo, landrTidiLliv Ffiritjirui Ekw-HruiiJca, !^28 Sierrii Ave.^ FtintitLii (^A
Central NY
AfllAletif nidlo hurd^LcxKit dLsplavK tnttdc td youi- iifK?i.'lfit.'utn)as— cjilbigni, plq^iiies, Jiward^c or ^|MvLul i>rdeii. High fjUftlUy, l9S\ a'r^'kti, Iww urtct^ A.&M. WfjodcfftH. HUN, M*fU%(fn Si., F.Q. Boa H3. Ri»mc NY 13440, iJ7-3<^.
San Dtego CA
Wr bu^ J 11.! vr*ll Sural iii Amiy Ni^-\ E\m.-- <rrink>, uLsiii K-Miiiruited Stateriai Whjit d<;ry'ni >^jiiT III yA\f VViite (lkt catjJtijfLiir. ESictnink- lovm. Inc.. 440-7 th A*oiue. PO Boi 304ft. Saw
San Jose CA BAN FEANCISCO BAY AAEA
HoRielmwd' haiiEn; tons ol ne* •ml Ufsd Mwiii'G»a|]ift« RAT mud I'lirntpnfientii. 5«f>1iif YiMim utmt I95S. We fpeculuK in tCOM, KLM. Mirijr. ComptTOOu Wc ship wfidd- lAidc- Tclje~QHn £3cctfOfiki^ lS46v Vvkm A^mur. S«n J^at CA a&ia4. :n7-4478.
Syracuse-Rome- Utica NY
Pefiturtiif(,; Kenwood, Ya«u, JCOM^ DrAkr. Tun-Tec, Swan, Dt^nTmn, Alpha, RiiIujL MFJ, Tempo, j\s.rron.f KL^i, Hv Giiiu, MiHli'v, t^rit'f). Ca-^tcfuft, HLkstlrr. Mini Pmtiibcta Vmi w*>i}'i Ik* dujippoinled with eqtiipTntTit; wri'ice- RlAjtk) WnrkL, Onrid* Qmntv Airport'Trrmi' ml biuMkig, Ondusy >iY L3424. 337^1203.
Colunibii^OH
The bj|^l Jtnd best Ham Stmv m \he mtdv^rai rnfurfng qualit> Kenwood pTuduct^ wjlh I'tiififnil d^pLav^. We wJJ nniy tjir beiJ. Aulluirii^ Kenwood Service -^ ifniw^fll Anuleiir Khdkt Inc.. 1230 Akk Dr., Re^iMUb^ huri rc:dimibi»i OH 43068, §66-4367.
San Jose CA
Ray #rt«'% ni-Hr«s1 Amateur Radki ihire N<^' ^ iLwl AiTFiBtrjr lladiD5alQ^&: wrvrice. VVefealuie KiTn-ifiiTd. ICt>M, Azxk?], Y'aefii. TctvTcc» Siifiittx it mam'TiKiie. Shai'ef Hadki, Inc., 1371 So. B^woin AiiT.,5*n JoseCASSISS. 9^1 ttQ.
Bend on
Satetlilp TV Kjkxwti bfaEal^. CiU todm\ Uv mm iniDTTTiatHxi aiKf iiv|ujre nbnut <nur dulct piFicrwn WESFEHCOM. P.O. Bm 7238. Beiid QB 977%. 3Sg4imi6.
hiiami FL
Ainalrur Aadki Center, inc. "EverMhlniif I mi Oh- ApiHittiir SJnDe lEJflO, fiSOS N.I. 2nd Av^ntK. Miami FL 33137. i^TJ-^SiS, TW'X ri2203».
Sctmnton PA
laJM Bird. CushCriUl, Beckmui. V^^Ar lentil, lliutler. Antennai SpodJilislSi, Ajitiun. A%anti, Belden. W2AU W2Vii. CDE, AKA. Vlbropiat Hstm-Km^ CES. Ampheinal. Suiu'. FiirMin/CrmhtT. HJkW, Amertt, Sbunv T.aRttf Ekdttmlci, U12 Cimnd%iew St.. Scramon FA 18500,343-2124.
Smyrna CA
Fnr yimi Kwm'<itKl, Vaesu^ ICOM, Drulci- und (HhiT linturi'Kf Hf^xl-i, aume tu fteu tw. DrtttS TwtvWav hadio. 2506 N. Atlanta Hd., !iinyma tf A 30086, 422rfi(m.
Preston ID
BiKt WBTFI^'7. has the Largest Stuck s)l Ama= tnif Ck^aj^ in tk' EnteTmountain Wot aixl el'H.' Bcml Pricia (IWI me for all your ham ticvtb lbs Piitnhiiting. 7S So. SCale. Fnatcm ID
Houston TX
K.xiiiTlmenter\ [MrttclL^iiil lileclrnnir uiid mi^. L'lMink'al compont-nlji fur rnrnpuler [w^hpli', MudH^ lT*«u3e, hams. rtAwt Imikler^. tXpcrl- fUfiili'iTt Open !ti£ davs ■) vn-k {^nlrwav Fllcc^ lfani«a Inc., 8833 Clarkcrest, Elinutun T\ 770n. ll7N'ti57S.
Teire Haute IN
Ymr ham headauarten kcjited in llv twart td the midwes] HoasieT EksetaMwct. Inc.. #i Ht«fci|i|i. CvaleF. P.O. Bat 3300« Twrr lUut^ IN 4l90ftl, £18-1456.
San Antonio TX
Compiler 2 way Mjrk-ice tjBJjji. Cull Pw, WiSFbP ^hn^ Anteima Spediiibtt, A^anlL .A/dfn„ Bird* Hy-gain. Standajd. VLhmpIra, Midland. Ilenrv. CuihCraf!. Dielectfic lliotkr, [COM, XiFI* Nve, Shurr. Ciibk Timyu, Ten- Tec and odlen. AppLianctf ^ EniAHoent Co., Inc., 331? Vaiwr Jaciuon RrfHdl San AntmiD TX 7S213. 734*7793.
Littleldfi MA
Thr ham iMire iif \.E vou cmn n^v ott Kefi- vbitfii. ICOM, Uiboiv totsii. Dentron, KLM ai^ipi. HAcW' ki&itchs & wattmetoi^ Wtiiitier Twdmt {kicfriurL, Bearcati. Hegeon^ antftifi«» by Ijirwn, Wilion, Hustler. GAM- TEl^COM Inc. C4)fnmijiiicatian& & Ebdronki. 673 Graal Hd.. Ri. I L9, Utt^ton MA DI4«0. 48^3040^
Vienna V'A
The Wa^Lnpcton mrtrDpoiitan ana'i loiKlin^ wpplieT oi the liAeit m Amateur Kadwo imd Ttsit E^uiptsem, On ymjt ifext bip ici thi- \it}t»n'i Capitri. ItOp b^ and see usu Ucetrcmk: tiVjuip- moA BaiA^W,. S16 MiU SI. N.E., Vienna \ A 93110, flSft-aSSO.
Ann Arbor MJ
Str m fm pnxlLiicU Ukt Ten-T« . B L Drain?. l>t!ntri.in aiid man) mort Optn Mundny tlir<ni|ih S^aturdav, 0830 to 1730, W-^VCR. Vt'BKllXO. W-Dh'OKN and V\'fiRF t>rhind the- aHJhtiT. Purcliaw Radio Supply, 327 E- IliHiver Aw.. Ann Arhor Ml 4Eim. G^-Wm.
Hudson NH
Nru I-]|||j;luiid'^ Distributur and Authorizud ^j- virt' < !(MkUT h»r uJl Mujur Amateur UneSi Tufto |{m4ii> l^kclnmics, [ixr., &1 LoweU Aowii Hud- Hin Mi 03051. SS3-S005.
DEALERS
Your company name attd message can voniain up to 25 worth for as Ht- tle as $I$Q ymritf (prcpaia). or $15 prr month (prepaid qtiartfrhi). No mefiHon oj maii-order business or area code permitted. Direct onj text and paymeixt must reach ns 60 dor/s trj autmnce of publication. For vx- ampfe, advertising for iite April ^82 isstte must be in our Stands by Fehnmry ht. Mail to 73 Magazine, PeierhorQugh NH 03458. ATTN: Nancy Ciampa.
17fl 73Magazme • February; 1982
PROPAGATION
J, R Nelson 4 Pfy mouth Dr. Whiting NJ 08759
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FT-208R - 2 Meters FT-708R - 70 CM
cmsnu.
The LCD frequency readotit provides high read* ability night and day, alcing with ¥«iy low airrent drain.
mnjom
SWfCH
All operating frequencies are entered from the front panel keyboard. Unusual repeater spirts^ scanning, and memory programming are all controlled via the keyboard,
UP/DOWN HAHIIAL tCAN
The FT-208R scans in either 5 kHz or 10 kHz steps, while the FT-708R steps are 25 kHz and 50 kHz. Automatic hattrng on a bu^ or clear channel is provided, with automatic pause and r^tart feature. Scan either the band or the memories.
UMTCD BAND SCAN
You can program upper and lower frequency limits, then command the transceiver to scan that segment or exclude that segment.
TBI MEMOHY CHAHNELft
The memories may be used for either simplex or repeater operation. No ne^ to throw a "5 UP" switch for those 15 kHz channels, either!
UDN04JFE MEMORY BAOCIIP
A Lithium cell provides the memory backup func- tion. Now you won't dump memoiy when switch- ing tiattery packs,
L0Mf CURRENT OIUUN
Typical standby current drain is 20 mA, for long battery life,
480 IHAH BATTBIY PACK
Witti more capacity than competing pacte, the FNB-2 battery pack gives you those precious extra minutes of operating time that might prove critical in an emergency I
In the high power position, the Fr'208R packs a walk}p at 2.5 watts output, while the Ft-706R output is 1 watt. Switch to low power for 1 watt output on the F-208R. 200 mW on the FT-708R. for even greater battery life.
A priority channel may be programmed from the keyboard, allowing you to check a lavorite channel while operating on another.
Automatic scanning of the band or memories (or a segment of the band) with pause and restart feature.
It BUTTON IITMF PAD
For autopatch operation, a 16 button dual tone pad is built into every FT'208R and R-708R.
PROQRAMMAMJE SPUTS
The popular ±600 kHz shift is standard (±5 MHz on the FT-708R) on the FT-208R. Odd splits of up to 4 MHz may easily be programmed from the keyboard. Additionally, a split memory/dial mode provides a third method of operating on unusual splits.
OPnONAL 32 TONE crest
Easy interface is provided to the synthesized SSY-32 CTCSS Encoder, providing all 32 common subaudible tones for repeater operation.
IjOCK SWITCH
The keyboard lock switch allows you to disable entry from the keyboard, thus preventing inadver- tent frequency change.
FULL LME OF ACCESSORCS
A Yaesu tradition, a full line of accessories is avail- able to maximize your enioyment of the FT-208R and FT-708R.
i
For more than a quarter of a century, Yaesu has produced reliable, high-performance communications equipment for the Amateur and Land Mobile services. Contact us today for full information on our cost-effective line ofHF, VHFand UHF transceivers — at Yaesu we want you to get your message across!
Pnce And Specifications Subject To Change Wtttiout Notice Or Obligation
w
The radlOm
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282
YAESU ELECTRONICS CORP. 6851 Walthall Way, Paramount, CA 90723 • (213) 633-4007 Eastern Service Ctr. 9812 Princeton-Glendale Rcf., Cincinnati, OH 45246 • (513) 874-3100
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Photo shown is TR'V a 16-kev
_ -I-
aulopatch UP/ DOWN microphone version.
Miniaturized, 5 memories, memory/band scan
The TR-77M la an incredibly compacts reasonably priced, 25-waU, 2-mcter FM mobile IranBceiver with fl^e memories, memory scan, automatic band scan, and other convenient operating features. The TR*7730 Is available In two variations: a 16'key autopatch UP/DOWN microphone (MC-46) version* and a basic UP/DOWN microphone version*
TB-7730 FEATURES:
* SmftUcat ever Kenwood mobile
Measures only 5-3/4 inches wide, 2 Inches high, and 7-3/4 Inches deep, and weighs only 3.3 pounds- Mounts even in the smallest subcompact car, and Is an ideas combination with the equally com- pact TR-840O s>Titheslzcd 70-cm FM mobile transceiver.
■ 25 watts RF output power
HL/LOW power switch selects 25-W or 5-W output.
• Five memories
May be operated In sfniplex mode or i^peater mode with the transmit fre- quency^ oftset ±600 kHz, The fifth memory stores both receive and transmit frequcricy tndependenUy. lo allow opera- tion on repeaters with nonstandard splits. Memory backup terminal on rear panel.
• Memory scan
Automatically locks on busy memory channel and resumes when signal disappears or when SCAN switch Is pushed. Scan HOLD or microphone PTT suntch cancels scan,
• Automatic band scan
Scans enUre band in 5-kHz or 10-kHz steps and locks on busy channel. Scan resumes when signal disappears or when SCAN switch is pushed. Scan HOLD or microphone PTT switch cancels scan.
• Extended frequency coverage Covers 143.900448.995 MHz in
si\itchable 5-kHz or 10-kHz steps.
• UP/DOWN frequency control from microphone
Manual UP/DOWN scan of entire band In
Synthesized 70-cm FM mobile rig
I \
TR-84aO
« Synthesized coverage of 440-450 MHz Covers upper 10 MHz of 70-cm band in 25-kH^ steps, with two VFOs.
■ Offset switch
For ±5 MHz transmit oflfset on both VFOs and four of live memories, as well as simplex operation. Fifth memor%^ allows any oilier offset by memorizing receive and transmit frequencies independently,
• DTMF autopatch terminal
On rear panel, for connecting DTMF (dual-tone multifrequency) touch pad (for
accessing auiopatches) or other tone- signaling device,
* BI/LOW RF output power switch
Selects 10 walls or 1 watt output.
* Virtually same size as TR-77dO Perfect companion forTR-7730 Ln a compact mobile arrangement.
* Other features similar to TR-7730 Five memories* memory scan, automatic band scan (in 25-kHz steps), UP/DOWN manual scan, four- digit LED receive frequency display (also shows transmit frequency in memory 5L S/RF bar meter and LED indicators, lone switch, and same optional accessories.
5 kHz or 10 kHz steps is possible when using either autopatch or basic UP/DOWN microphone versions.
' Offset switch Allows VTQ and four of five memory frequencies to be offset ±600 kHz for repeater access or simplex,
* Four- digit LED frequency display
Indicates receive and transmit frequency.
• 8/RF bar meter and LED Indieatofs
Bar meter of multicolor LEDs shows S/RF levels. Other LEDs indicate BUSY. ON AIR. and REPEATER ofiset
« Tone switch
Optional accessories;
MC-46 16-key autopatch UP/DOWN
microphone
SP-40 compact mobile speaker
KPS-7 Qxcd-siatlon power supply
More informauon on the TR-7730 and TH'8400 is available from all authorized dealers of Trio-Kenwood Communications nil West Walnut Street Complon. California 90220
®KENv\/qaD
TT , , .patesetter in amateur radio
Specificaiiona and prices are subject to change without tioiice or obligation.