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Ham Radio Magazine 1981

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hamWWW.RADiOSCAMATORUL.Hi2.RO HincorporaORIZONSAM RADm ring radiomagazine CollinsWWW.GiURUMELE.Hi2.RO owners' report ..........22 digital frequency display ......... 28 tracking satellites. ...... .46 adding fm to your receiver ...74 converting surplus I nunications ?ology cavities I WWW.RADiOSCAMATORUL.Hi2.RO WWW.GiURUMELE.Hi2.RO WWW.RADiOSCAMATORUL.Hi2.RO WWW.GiURUMELE.Hi2.RO save stop I corn1 I n the rr when Switchlna antennas is ceasy with i Heathkit" SA- 1480 Rernc AMJIO WWW.RADiOSCAMATORUL.Hi2.RO WWW.GiURUMELE.Hi2.RO WWW.RADiOSCAMATORUL.Hi2.RO ,olume 14, number 3 1 T. H. Tenney. Jr.. WlNLB publisher and editor in chief I Alfred Wilson. W6NIF I editor-~ ~- 12 converting surplus ANIUPX-6 cavities Robert S. Stein, W6NBI editorial staff WWW.GiURUMELE.Hi2.ROManin Hantt. WBICHQ 18 DXer's Diary ~roductlonedltor I Joseph J Schroeder. WSJUV Bob Locher. W9KNI Leonard H. Anderson associate editors W.E Scarborough. Jr , KAIDXQ 22 Collins Owners' Reports: graphjc production manager I KWM-2 and KWM-2A Irene Holl~ngsworth editorial assostant Martin Hanft, WBlCHQ Wayne Pierce, K3SUK cover 28 digital frequency display for publishing staff single-conversion transceivers J. Cra~gClark. Jr . NlACH Everett L. Beall, K6YHK assistant publ~sherand adVeRlsing manager Susan Shorrock 34 ham radio techniques c!rculation manager Bill Orr. W6SAI hem radio magazlne 13aubl~shed monthlv bv I 38 genesis of a synthesizer Ken Grant, VE3FIT subscription rates I 44 CW anyone7 Harry W. Lewis, WJWJ 1WI da ant 46 tracking satellites in elliptical orbits ;hree;ears, 544 00 Paul C. Bunnell, WA6VJR Europe. Japan. Afrlca lvla A8r Forwardlns Serv~celone vear. $28 W 52 protection for your solid-state devices Henry H. Cross, WlOOP foreign subscription agents 1 64 transmission-line circuit design: Foreign subscrlptlon agents are llsted on page 89 part 4 H.M. Meyer, Jr., WGGGV Mbcrof~lmcoples are avatlable from I 74 add fm to your receiver John LaMartina, K3NXU Cassetle tapes of selected artlcles from hemred,o are avadable to the 1 bl~ndand phys~callyhandicapped from Recorded Per~odicals 110 advertisers index 4 observation and 919 Walnut Street, 8th Floor Ph~ladelphia,Pennsylvania 19107 on Copyrtght 1981 by top 102 ham mart 60 buestions and 84 ham notes answers 7 letters 110 reader service 106 new products 109 short circuits Observation WWW.RADiOSCAMATORUL.Hi2.RO& Opinion The January, 1981, issue of ham radio, which incorporated Ham Radio Horizons, resulted in a flood of mail. Responses were mixed, as expected. Readers who had never seen an issue of ham radio were surprised and pleased with the new magazine. Old-guard ham radio readers appreciated the new mix of articles. We also received complaints from Horizons readers, who expected all of their favoriteWWW.GiURUMELE.Hi2.RO features in the combined magazine. A major change in a magazine format, such as was begun in the January, 1981, issue cannot be accomplished overnight. When the decision was made to discontinue Ham Radio Horizons, the January, 1981, issue of ham radio was almost "locked up" and ready to be sent to the printer. This state of affairs resulted in an intense scramble to include at least some of the Ham Radio Horizons articles. Production schedules are demanding and unforgiving in the magazine-publishing business, so it was impossible to include all the Horizons features in the January issue. Under the circum- stances, we did the best we could. We don't intend to abandon our faithful Horizons readers, nor do we intend to compromise the technical integrity of the magazine. If Horizons readers will bear with us for a few months, they will find more and more articles and features that made the Horizons magazine so popular. Ham radio has enjoyed a reputation for technical excellence for many years. We plan to continue this tradition. Suggestions for article subjects were many and varied. These and the constructive criticism we received are gratefully appreciated. All were carefully considered, and future issues, now in the plan- ning stage, will include as many different subjects as space will allow. We received requests ranging from "more antenna theory" to "more on operating practices, sta- tion accessories, DX, and elementary theory." The demand for the continuation of "Ham Radio Techniques," "DXer's Diary," "Equipment Owners' Survey," and "0 and A" came through loud and clear. We got the message. You will see these features as well as some great stories that we've been keeping on the back burner. For the advanced Amateur, we have some interesting construction articles - in short, something for everyone. You asked for it; you'll get it. caution I'd like to direct your attention to a letter in this month's "Comments" column taking us to task for a potential safety hazard in the modular amplifier article that appeared in the January issue on page 12. It's a point very well taken, and I'd recommend that anyone planning to build this circuit take a close look at my reply to the letter. That's it for now. See you next month. Alf Wilson, W6N I F Editor 4 march 1981 ICOM MOBILE! ICOMWWW.RADiOSCAMATORUL.Hi2.RO MOBILE! TAKE ANOTHER LOOK AT THE POPUIAR MOBILE TWINS. K-260A AND IC-255A. KoM IC-Zm. Enjoy VHF mobile at its best. Sideband, FM or CW, the ICOM IC-260A does it all. The ICOM IC-260A contains all the features a mobile operator would want in a compact 2 meter mobile package with FM. SSD, CW opemtion. Features customers ask for most including: * Squelch on SSB. The 260A will automatically and silently scan the SSD ponion of the band seeking out the SSD activity on 2. * 3 memories built in. WWW.GiURUMELE.Hi2.RO* Memory scan. * Programmable band scan. * 600kc repeater offset built in. * Variable repeater split - with the 2 built in in VFOs, it's possible to work the odd splits. + Multimode opemtion - USD, LSD, CW, and FM. Greot for get- ting into OSCAR, plus enjoying SSB mg chewing as well as repeater opemtion. ICON IC-2Sm. Features that have made the field proven and tested IC-255A the most popular 2 meter FM ti on the air today. * 25 W / IW battery saving output. * Scanning (memory and programmable limit band sc now with automatic scan resume. * Programmable splits - flexibility for new repeater offsets. * Dual speed tuning - 4 5 KHz Steps, 5 KHz Steps with TS Switch depresse * 5 memory channels - For easy access to your favorite repeaters. * Dual VFO's built in, lockable. mobile mount, dynamic mic standard, RIT fine tuning. * Simple, easy to use single knob tuning system for mobile opemtion. 21 4 2 1 16th NE, Dellewe, WA 98004 3331 Towerwood Drive, Dallos, TX 75234 All stated soedflcodons anopprorlmate and wbJect to change wlchwc norlce or obligatlw. All ICOM mdlor slgnlflcondy exceed FCC regulatloru llmldng spudws emtulw. Two Meter Boomers Whelher you have the space for the 3.2132-19 or the campact 2 2A models. two meter Boomers are your best choice They offer lhe maximum galn available for thelr boom Iefigth (Sea NBSno 688) They feature triga, reflectorsIor &tml fronI-tack rat0 and clearer partems All stanless sfeel hardware and heavy gauge heat treated alum~numare used thrqhouL Whatever your choice of two meter amateur acttvity. the Boomer will fill your needs For FM use the 228- or 214- For CW/SSB on the ICM) end use 32-19 or 2148. in €ME.WWW.RADiOSCAMATORUL.Hi2.RO OX or rsst fellable QSOs Bmner wll perfom, for yar Six Meter Boomer Ttm new SIX meler Boomer Mers mare baam ammore aain from 11s new element spacing The SIX meter &herha<- Cushcrall's lyplgl allentm to delail, including T match feed wllh balun. arid extra heaw duW rnechancal conslructlon. The key to lhls Boomer's siqRr'perforrnance and relalrvely tghrwerghl ISspecla1 element spacing and boom lenglh WWW.GiURUMELE.Hi2.RO Stacking Kits For slackino two 01mers, use t adpower ihvlder h:I& . - --- 37-19 = 32SK 214B = TZ+K bl/+B = bl ISK When stacking four Boomers, use the tollowirlg complele slacking ktts They ~ncludeH frame. harness. Ihardware anc cmplele instructions 32 19 = 324QK 2140 = 224QK ecif ications, Stacked Boomers nna ~'&?I&B1 m.19 1 ?x61768 14x2168 1 Ar12-19 in, 10 92 34 10 12 (m) 305 366 1038 305 366 Hark 011 - - - 10 14 (m) - - - 305 427 WlapporCb) 18' 62' 89 97 ma 816 11 79 2812 3130 4400 ~mrsdmscn 9 11 18 9 13'4- (m) 274 335 549 274 406 wan m(Ft2) 34. 70' 96' 83 152 - JI. (90 m) 2 32 89 89 141 The Prntennc M1+ 2668 (01 + 2.6 + 24 '90portmstmthddsd 48 Perilneter Roo Manchdm. NH ( Tell 'em y in HAM Rd ceivers in New Zealand, and the this method may not be quite as ac- notes I made on it were as a result of curate as the method explained by my bench work following modifica- author Mead. However, even though - tions to put it on 144 MHz. The short- the sun's azimuth is changing more ing of the crystal was only during a rapidly at meridian passage than at test setup. (Surely Mr. Nelson does any other time of the day, 30 sec- not think I employ a little green man onds' error in time will result in only a WWW.RADiOSCAMATORUL.Hi2.ROto short out the crystal each time I fraction of a degree of error in the re- switch it on!) It is still flying too, after sulting orientation. As an example, at a year's operation. latitude 35 degrees the azimuth True, there were other circuits in change in 4 minutes at meridian pas- his article which probably would have sage is 1.7 degrees when the sun's been suitable, but this was the circuit declination is 0 degrees; it's 1.1 de- built into the equipment so it had to grees when the sun's declination is 23 be got going on its new frequency.
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