A

The wedding drifting tt nvord hea en 73 Amateur Radio * August 1990 15 Photo C The nervous groom forgets to lower the antenna. Photo T Tommy N7KBO and Earl KS8J prepare to float on the air Photo C The nervous groom forgets to lower the antenna. wjs tlso the first hot air wedding for both the minister and the balloon pilot. To add to the event, the ceremony was broadcast over ATV to the witnesses and crowd below. in addition. Norm WV7K and Wayne N7MAO sent back pictures of the ceremony...

All Items Are Guaranteed Or Sales Price Refunded

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All Sales Final

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Antennas

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Bilal Company

137 Manchester Drive Fiorissam, Colorado 80816 (719)607 0650 C.L Houghton W86IGP San Diego Microwave Group 6345 Badger Lake San Diego OA 92 J19 The Southwest Division ARRL Convention is being held in San Diego this month at the Town and Country Convention Center m Mission Valley This is about ten miles from my home and I plan to be there for ail activus. Plans include presentations by Ed Munn W60YJ, Introduction and Overview Gordon West WB6NOA, VHF UHF DXingM Bill Burns WA6QYR. Moun-taintopping...

Buy With Confidence

Te gifl i fmtlt I drnthrm ry from C 7 of any scan ner. sen d or priorie your order directly 10 Our Scanner D fnbution Center Michigan residenrs please add saJes (a* ot supply your tax ID, number Written purchase orders aro accepted Irom approved governmenl agencies and mosi well rated hrms at a iQ'Vsurcharge lor net 10 billing All sales are subjeCT to avaiiabiiCy. acceptance and t-enJication On all credit card orders, the ship to address musi exactly match the credit ca'd bhJlmg address im he...

Cat Automatic Control Operator

* Control Authorization RS-232 Computer Interface Breathe new life into yourJ'old repeater controller. Add the CAT-100 to your existing system, and realize the features of controllers costing thousands more. t c t , COMPUTER AUTOMATION TECHNOLOGY INC. pL l sSi 3509 A limited suppfy of Uniden SCO's with RFT ON OFF. Repeater splits, sub audible tone, mike and power cable, 1 year manufacturer's parts and labor warranty. Also Available Complete line of Uniden prolessionaJ Two-Way products at...

Cercle On Reader Service Card

THEY'LL THINK THEY'RE JLLST HAVING FUN cumutete facsimile reception system r the IBM VC or Compatible. Receives 0 Pa e Manual Tutorial Cassette Interpretation Guide up lo 16 intensity levels* I Deludes Print un Epson, or HP LnstT iet Disk Save, Zooming. linage processing t natlfiided Image Capture and much more Designed to receive images directly from U.S. and Soviet meteorological satellites. I eludes h M of I he above feature plus B complete orbital tracking vytem und resolution of up to 256...

Circle A Header Service Card

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Circle Dn Eaoer Service Caro

Elevate the status of your repeater with the RC-850 Repeater Controller, fiver heard a really groat repeater One tiiai sounds superb is fun to use And benefits its users through its wealth of interactive Features Chanc es are, it's controlled by an ACC RC-850 Repeater Controller. Because more discriminating repeater owners choose ACC controllers for their systems than any other. And the 850 leads the industry in performance. The 850 is extensively programmable, using interactive Touch Tone...

Circle I On Reader Service Card

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Circle On Re Ader Service Card

OS Lot the Month To eninryour OSL. ma i hi in an envelope k) 7 t WGE Center. Fores Road, Hancock. NH 03449. AUn OSL of the Monlh. Winners receive a. one-year Subscription (or extension to 73 Entries not in envebpes cannoi bo accept& d OS Lot the Month To eninryour OSL. ma i hi in an envelope k) 7 t WGE Center. Fores Road, Hancock. NH 03449. AUn OSL of the Monlh. Winners receive a. one-year Subscription (or extension to 73 Entries not in envebpes cannoi bo accept& d scribers to 73. the...

Circle On Reader Seance Caro

UAI-10 AND UAI-20 UNIVERSAL REPEATER LINK AUDIO INTERFACE Delarled application manual Low power operation, 19ma I2v CTCSS decode on the UAf iO onr* Assembie< Jr tested one year warranty Link monp Qr-mix moni1or mute conirol Adjustable repealer link OTMF audio autpuls Labte DTMF mule on rep ateF and link audio Repealer, Jink, aumbry and contrcrf audio rnputs Delarled application manual Low power operation, 19ma I2v CTCSS decode on the UAf iO onr* Assembie< Jr tested one year warranty Link...

Circle On Reader Service Card

Qroville CA Your magazine < s no w and has always been the besi annates magazine because it has always had good construction projects in the pasl there were priceless projects that are now lost Mime Keep uf the construction projects because ihey help the availability of parts by creating a Demand (I am not a dealer but I do build a Jot of projects lhat 1 pass on a cosi o locat hams If your edilors would look back into those ola issues ihey would find much that is still appii caoie...

Circle On Rfader Service Card

IT'S A SNAP WITH GGTE MORSE TUTOR, THE CHOICE OF THOUSANDS OF HAMS & PROSPECTIVE HAMS, PRAISED IN OST. 73 AND WORLD RADIO LEARN IN JUST 12 EASV LESSONS FEATUFtESOF rms UJSUQUE PACKAGE INCLUDE Corfe -speeds om i to over TOO WfM MSt& ndanl Of Fii'nswgnh njrtei Over a billion random conversations NLeiigr , nurrtbers punctuation n pro signs Random chaMtiers & words lor nkcft It sson Display lexi while listening or aliar copying Alf p r mete'S between iewions Par ameisrs eegrty changed...

Coach

MORSE COACH* A complete (eachfng and testing program tor learning the Morse code in a cartridge 8524 DAKOTA DRIVE, GAITHERSBURG. MD 20877 1 0001 or Putfic Donitn Am*teur R*0io Progrimi ind Dita 1 0001 or Putfic Donitn Am*teur R*0io Progrimi ind Dita vmta' ftrthim '.innipii .j 'pa-nnHiJ fh 3, ci H - Uinvfit Yirgin 2U7 703 M-STT7 Afrt) 702-S42a fh 3, ci H - Uinvfit Yirgin 2U7 703 M-STT7 Afrt) 702-S42a TNT is No T ine or 60 4ft 2a 17,12 & 10. TNTt2 is N > tune on ifi, 10. W rt oThcr h fld w...

Compare These Features

Toll restrict 1st and 2nd digit restrict, prefix lockout and digit counting 1-5 digit connect disconnect code 2-5 digit secret toll override code User programmable CW ID Remote hook flash Auto disconnect on dialtone busy signals Telephone remote base Remote controlled relay (relay optional) Lightning protected Call or write today for your FREE brochure. 23731 Madison St. Torrance, CA 90505 Phone (213) 373-6803 AMATEUR ELECTRONIC SUPPLY v- *a V, V* v Oh- CW- o FL. C'Qat- Las OuNV * BARRY...

Departments

17 Feedbacktndex 82 Ham Help 17 Ham Profites 44 Hamsats 2 Letters 66 Looking West 4 Never Say Die 68 Notes from the ELK 76 Packet Talk 86 Propagation 78 QRP 7 QRX 42 RTTY Loop 59 73 international 62 Special Events 86 Uncle Wayne s FEEDBACK FEEDBACK It's like hcin there ri hi here in our LifFkesl How Iun'i lihkf advantage of our R EDBACK carcl 1 in pfijic 17 Vnhj II notice .l feedhac I. number at the begiMimf nl each vtkkundcolumn. We J like < HJ u> rnt fchaiyou fcjj mi tlui v*c inn print...

Dnbme

WOfl is Indte Woridt a monthly publication which reaches about Sr000 independent record companies It helps them keep up with recording techniques and digital technology ft helps ihem with marketing and industry information. W09 is Creative Music Marketing, a new dislribulion system for indie music. CMM will be getting started in 1991 with a completely new approach to dis-tribuiing music. Participating retailers will set up Indie Musk Boutiques and will be able lo make five times the normal...

Expandable Repeater System

Call or write for our free 4-page brochure on Digital Signal Processing and the DSP-12. A NEW CONCEPT IN REPEATER DESIGN, THE Hi Pro E IS AN EXPANDABLE REPEATER WITH THE FOLLOWING FEATURES A BASIC REPEAlER WHFCH WOULD INCLUDE A COMPLETE RECEIVER. TRANSMIT I ERr CORr FRONT PANM CONTROlS AND INDICATORS, LOCAL SPEAKER AND M C JACK AND CAPABLE OF FUTURE EXPANSION, ALL HOUSED IN AN EXTREMELY RUGGED. ENCLOSED. 19 INCH RACK MOUNT AiiLE CABINET *TH(S SYSTI M CAN Bt EXPANDED AT TIME OF PURCHA5F ORGAN Bf...

Grv

- Fui-SiEi vi mil lAHnKti ni iti r tu ri a o iultiri ' EvflT ttint iBL'li J * Fiiiiy I*juLI(*J. r, -J. n f Juiir rtint All Hind* IneI W RC Ba.U V4ar oh n r-'1 cn ten le h Oi d* r T< .hNoM H24-C Ji. fl FpJ USA tcni (101-3 5-l* S ro' T cIl ' Full Suc G E V Stey* Jiiifi HiJiScGSKV i il J 10 Di i ' Full Suc G E V Stey* Jiiifi HiJiScGSKV i il J 10 Di i Mw,-oc Uir CTltri i '-ft . C1,fit IS,

Ham

The sunspot cycle is peaking and 10 meter propagation is at its height allowing you WORLD WIOE communication from your vehicie.Tocapture this phenomenon American Antenna, manufacturer of the world famous K40 Antenna presents Ihe HAM 10. Guaranteed to outperform any competitor or YOUfl MONEY BACK Handles maximum power limits from novice to extra optimum performance Stainless steel whip and base Comes assembled and tuned with an adjustable trunk lip mount

Info

Frequency stacking for microwave transmission Each group subgroupt is modufated together by a progressively higher frequency tocaf oscillator to stack 600 voice channels into one microwave transmitter receiver (full duplex voice). Figure 2, Frequency counter calibration using WWV and 700 kHz oscillator as a transfer standard a) Zero beat WWV wtth BFO on m receiver (use WWV quiet period) b) Turn on 100 kHz oscillator and adjust me circu t (oscillator calibration to agree with WWV zero...

K

Send 3.00 for our current catalog and wholesale sheet J Thought you oulWn afford reai y good QSLs7 These cards wjIJ change your mino1 High Quai tv flAI5E0.3fllNTEQ QSL CARDS can be in your hands for only 4c EACH Beautiful Glossy Jnk on Ivory. 3Jue. Gray or Yeflow 57 fc Vellum Bi sto' We prmt in blue ink rn itie format Shown, If you don t want ihe state outline, we car remove it. and enlarge the callsfgn to balance out the card. MO EXTRA CHARGE for ARRL, QCWA, AMSAT logos or additional wording...

Microwave Antennas

Power Dividers Slacking Frames. OcmpJet Array pf 910 1269 1296 t691 304, 2 t 2*56 WH ForTnopo, EME. Weak Signal OSCAR, A TV, Repeaters. WEF AX, Commercial point to point. AvaifaDfe in 3333LW 33ei loop Vagj Kil 902 M H Tfl.5dBi SfiSOO 23- SLVK fc loop 'ay Kt 1296MH & S9O0 45ef loop Yag 21 3B S 900 44el loop rag 2TP& SP9 235SLVX 55ef Superiooper KjI 1296 WHi 22 S99 00 IS1 LVK 45el loop Vagi. Kit 2304MHz 21 < 0, 575 00 945LYK 45el l opYagiKi 3456 MHz 21 o0i S75.0 Othdf models...

N

Models also avaJiabie without GaAs FET preamp (delete G suffix on model AJf units cover full amateur band - specify 10 MHz bandwidth for 420-450 MHz ampler. Con* jrcuous duly repeater amps so available Amplifier capabilities 100-200 MHz, 22S400 MHz. 1-2 GHz. Military (20V) Commerciaf, etc. aiso availabfe - consul factory strong at 25.4 dB below carrier. Several other minor out-of-band spurs were noted, but these were all more than 50 d8 down At startup, the visual frequency was 434.04 MHz....

Opto Keyers Stocked

New TEN-TEC Co'sa-r II, PARAGON OMNI V IIX Towers, Antennas. Mobile R dm mou ni s Hy-Gam Towers will be shipped direct to you FRE of shtpprng cosi New TEN-TEC Co'sa-r II, PARAGON OMNI V IIX Towers, Antennas. Mobile R dm mou ni s Hy-Gam Towers will be shipped direct to you FRE of shtpprng cosi MAIL ALL ORDERS TO BARRY ELECTRONICS CORP. 512 BROADWAY, NEW YORK CITY, NY 10012 FOUR 8L0CKS NORTH OF CANAL ST.) Maw Vhrk Pitw LARGEST STOCKING HAM DEALER nt w Turn wily 5 COMPLETE REPAIR LAB ON PREMISES

Pc Electronics

Brian Lloyd WB6RON 124 Churchtlf Avenue Palo Altot CA S4301 The other day I gor a telephone call from Andy Dimartini, Presidenl of Digital Radio Systems. Inc (DRSt) it seems that A ndy Iried my idea of using the V.23 mode oi ihe modem on me PC*PA and discovered that it worked better than the Bell 202 modem mode He gave me instructions on now lo switch the modem in the pc4 PA from Bell 202 10 V 23 Here are his instructions-. V.23 is selected by taking TRS (ptn five). TXRi (pin 13 and TXR2(pin...

Rep Repeater

Same fine rl modules as REP-200 but with COR 4 Controller. Can add autopatch, dtmf decoder. CTCSS, either now or later Kit only 675, w.t 975. COR-3 REiPEATER CONTROLLER kit. Features adjustable tail & time-out timers, soJid-staia fi' ayT courtesy Iwep, and tocaf spea er amplify 549 CWID_ Diode pro ammed any tirr> e in the field, adjustable tone, speed, and timer, to go with COR-3 59 NEW COR-4 kit. Complete COR and CWID ttIJ an one board 1c* easy construction CMOS Jogie for low power...

S

External connections are made on the rear panel. Photo C, The CU-125 controf unit's quality is evident in its construction aux audio in This is a second audio input to the control unit and can be selected wilh the from panel auk audio button. Line level sources such as VCR audio outputs can be connected. tofiecconv F-connector The external receiver module is connected here with RG-S9 Of equivalent This provides operating power to the module, and is the receiver's IF inpul to the...

Sow M Ssb Scvrs

3 Band QRP T2, 15, 17M (QST 10 69) S99.00 Micro 20 Hi Performance RCVR 59 45 RX Noise Many Ol her Kits Available Factory Wired Complete Ameritron. Ten-Tec Line CALL B W PT-2500A Amp 1,695.00 9& W VS 1500A Tuner S41& 00 We nowsiock R hn tow rs. dials, termmaia. chassis, ceiamjc standolfs, hardware, toroids. amp components, B& W coil 1toe Ik H e IC. Shipping Ex tra RADIOKIT * P.O* Box 973*0 Catalog 51.00 Pelham, N H 03076 (603J 635*2235 CIRCLE 4S O M READER Sift VICE CAR Pamela Dass will...

T

V 1fltl _k ' nT 1 rffll M H 1 IMni . 11-11 - - - - taidef iir t i ihufliil t n d or Fi ureS. Top section ofcol I incur 10 73 Amateur Radio August, T990 i MHz) times the velocity factor of the coaxial cable, h m> original article I used RG-213 with a velocity factor of 0.66 I now use RG-lt or CAC-ll < a solid conductor aluminum shield cable) for high power antennas and RG-6 for low power. To begin construction, remove the jacket and shield from eaeh element and slide it into hobby brass...

The First Part Of Ihe Body That Muscular Dystrophy Affects

Et's hard to smile u hen you osth the ability to walk. To plav To draw pictures. To climb tree But that' what happens when a child has muscular dystrophy. Muscular dystrophy is the name for a ftroup of diseases that weaken and destroy tho muscles The disorders are progressive, so things get worse over time. The muscle loss can't be stopped. And it can't be reversed. he Muscular Dystrophy Assignation ts stri in tu ture muscular dystrophy. And on Christinas Eve Lit 1987, MDA researchers announced...

Ttle Vision Ystew

J KQi rvry ijt ui i CAW NT5C Color i i KVP SOLft' in C D fiT 'UTION 250.000 I 'TXFILS LENSf i nmm. Fl fi STABILITY -c MENTATION jBYSTEM -A stabilmjU' t - p- 15 fitir-'l lo lh' .'rain rof nl - oirrol imkacf n fi l.hat 1L5 motion produce a -1 tnl zmji cyclic pitch input if il is disturbe-a The bar ts fitted with weight* as w+ ll as small airfoils and acts as a yroscQ i In Mition itn ehclnc rale gyra prKlnres a siEn-.l proportionO lo .m* rat which injected into th rivmi co& trol - . J -m ir. ca...

Updated Super Icom

SUPER ICOM BP 7S 132 volis 200ma triple the capacny of the icom BP-7, 5w output SUPER ICOM BPBS. 96 vollSP I200ma 50 mare capacity than the com BP-8 Both ate rapid base charge only or slice m *all charger A mches fiign BP-7S or BP-8S S65 0Q SUPER KENWOOD Exact reptacemBnt FNB-2 Nttad pack SUPER KENWOOD PB 5S PB-26S. 8 4 for Yaesu FT-4WR 207R 208R 70SR olls, 900mi double the capactw of the PB 25 P8-26 for the 2500r 60C 3500 3600 Charge .Mtheither The standard waif narger or drop in charger 3...

Wm W V

Fhii biuik pr vidth j fif t rate ir -iroducnem ui life Lsn die 2 6 .md 25 meter tarni*, as well a* 23. 33, and 70 CM. St-50 i MSi GGTE Morse Tutor H ivpp> di k for tBM PC. T AT, and compatibles. Lc m the Inii'r national Morse code tir improve )tur ca u hi hue - One Jisic Jtc wi 11 iiicywt fromb miKit ihfiWy ii ira cli tn eny uili pjced Icsion.s Siuiidard or Farnswonh mode Code speeds from I io over 100 vtords per minute. S19.50 0SE94 * Crash Course m Electronics Technology by l.ttuii B....

Rf Tronics

RF Tromcs, a company thai specializes tn custom electronic hobby accessories, has solved the memory problem in nickel-cadmium batlenes *ith the CAD CYCLER The CAD-CYCLER helps restore a battery to its full amp-hour capacity by properly discharging Ihe pack to a precise, recommended level. Full capacity is usually restored in three charge discharge cycles Repeated use of the CAD-CYCLER wtll help preveni memory from ever forming and will maximize the life span and number of charge discharge...

Service Survey

After visiting a servicc facility, i can usually sum up my feelings ahout it in just a feu words. Kenwood is professional and firm ICOM is cordially professional and reliable and fen-Tec is ' professional but relaxed. I would eall Yaesu* subject oT this months service survey, professional and very flexible 1 Believe me. This is not a contradictory statement While I waited for Customer Serv ice Manager Johnny *L JohnsonN6TVL to show me the service facitilv . I knew what 1 was in for. Overhearing...

Kenwood Electronics Canada

P.O, BOX 1075, 959 Gana Court Mississauga, Ontario,Canada L4T 4C The ability to easily interchange equipment between stations may be crucial in an emergency. All stations active n the Amateur Radio Emergency Service (ARES) should use a common type of power connector throughout their stations, or they should keep an adapter on hand. Dick Rawson N6CMJ, writing in the June issue of Electronics Museum ARC newsletter, suggests Molex* 2-pin (0.093-diameter pins), 12-amp connectors with a contact...

Helical Resonator Preamps

Pre mps with 3 or 4 sea ion hejical reson rors reduce intermod amp cross-band interference in cuiicaL applications MODEL HRA-n, S49 vhf. S94 uhf Specify Tuning range U2-1S0. 150-162, U 213-233, J TO SSD, 4 4 0. Low noise convefters to receive vhf and uhf bands on a TOM receiver Chc amp e of kit w th case amp BNC peks kit with peb oniy, 0 w l uni in a case Other modeis avail a bio far other in o rt ranges amp atv Request catalog for compfote listings. VHF Input ranges avail 136-138, 144-146, 145...

Vta

Completed col linear four V2 -wave elements . your back yard. Mount the antenna to a pole, making sure to clamp the antenna to the mast at a point below the decoupling sleeve area. Attach a wattmeter or VSWR meter at the antenna. If the SWR is over 1.5 1 you can adjust the decoupling sleeve slightly up or down the feedline for the best reading. If you've designed the antenna for a down-lilt, you can check it by observing the signal strength of a nearby repeater. Tilt ihe antenna until...

Ld U

Bin Etj 'HI. nliirf7 flfl i Power output on our test unit was a bit be- ow the 1 watt rating but there was Still plenty to work the local gang with good antennas. We had to reduce the power even further to prevent driving an external Mirage D24 amplifier into noniinearity. The instruction manual is well written and complete. It provrdes a biock diagram as well as a full schematic with a parts placement diagram, There is no alignment information, but most ATVers lack the test...

Lkehd

Vaisala Weather Balloon

One of the chase vehicles ready to tra lt k down the packj age. Photo by Phi KA9WGN. chilling cold temperatures at ihe higher altitudes. While ii may be 100degrees at ground level, temperatures plummet to 60 below at 50 000 feet. Once through the coldest pan of the atmosphere between 35.000-70J gt 0 lt feet it warms up to a toasty 23 degrees at 110.000 feet. What to fly Pay loads have consisted of a lO-milliwatt 2-meter CW transmitter, packet J igipeatcr the world's highest and...

Wa4adg Tracking

Ml r-.Q -jia s mo uni fid en Co b te-sided oc botrtj 1 LU MU nm tt r P.t. Electronics KPfl-5 Figure 4. Fay load black diagram firsi flight of folks willing to use up your excess helium to imitate Mickey Mouse. For the larger balloons, it's a good idea to find an enclosed ham or hangar for inflation Any wind quickly turns the inflation process into a very harrowing experience, Make sure lhe building's door is large enough to remove the balloon. It only takes one gt .harp object to cause a very...

Texas

In Dallas since 1960 We teat Lire Kenwood, COM. Yaesu. AEA. Butternut. Bohn amitour publications, and a full lino ol nic-cessorioi Faclory authorized Kenwood Service Center ELECTRONIC CENTER, INC., 2609 Rosa Ave,. Dallas TX 75201 214 969-1936. C.rcte Reade Service 74 for more intcrmarion Hard to find pari ., surplus electronics, standard line items Hams, hobbyists, Industrial professionals rrom nuts bolts lo laser diodes Electronically speaking Gate- a gt s qot r1 M-F -5 30Sar 9-5 GATEWAY...

Elktronics

Photo G, Mirror mount for video camera. Photo F. On-screen video overlay telemetry, ihe rocket reached apogee, the roll rate had almost stopped and you could see fields and raids. Even without ihe telemetry, the flight was a great succcss. could never have accomplished these flights without the helpfof family. friends and the people mentioned ahnve I owe special thinks to niy wile who got her Novice with me, helped htiild rockets, let me buy hundreds ol dollars of gear to support each flight,...

International

Amie Johnson N1BAC 103 Old Homestead Hwy. N. SwanzeyNH 03431 As I am writing this column the news reports that devastating tornadoes almost wiped out the downtown and surrounding area of Union, Colorado, during tne night June 6 7 Since tgrew up m a tornado belt in northeast Kansas. I 'eel very concerned for the residents of Ltmon One item in the report caught my ear There were no communications in or ouj of the area until TV news teams from Denver 70 miles to the northwest, amvedseveral hours...

Audi Antenna

Tuning in ATVrepeaters the fun and easy way. PC Electronics 2522 Paxson Lane Arcadia OA 9100M537 TeJ. 818 447-4565 Price Class TVC-12G Downconverter, 109 20624 Tonna Antenna, 70 Down East Microwave Box 2310t RR Troy ME 04987 TeL 207 948-3741 23LNA-WP Preamplifier, 100 Amateur fast-scan television FSTV is mushrooming It seems like every ham with a video camera wants to get on and show off his cinematography skills The availability of space shuttle video via satellite, and the receni ATV balloon...

Bnb

HAM EQUIPMENT For Novice Extra Class or ex.perimenter Best offer Fair io enCellent condi on ICOM lC-735 HF transceiver iCO AT-150 antenna e' ooa TM 411A 70c m transceiver A E A P K-232 m ultimode data controller pfus AEA Compakratt with FAX, Healhkii HX-1681 iransrnitter. Heathkit HR ieSO receiver, Heaihkii PS-23 power supply. Healhkit HS-t66t speaker WRi-751 SSBJCW iignat enhancer. Tendee Modet 228 antenna tunef SWfl bridge, John son Viking Adventurer 50-wart ta f-contf oiled rransr- Bob...

Spectrum Probe

Ioosel gt couple a grid dipper adjured k gt 36 MHz to L2. Adjusi LI sith VRl in center position for a maximum reading on the dipper being used as a luned Ri voltmeter. Adjust C14 for maximum reading. About LI VOC should be present at the emitter of Q2. Set the dipper lor 12 MHz and couple it to L3, Adjusi C 15 and C I 7 for maximum indication on the dip meter. Aboiii 0.1 5 VDC should he at the emitter ofQ3. Move the dipper to L.4 and adjust C 19 and C20 for...

Fannin Houston Texas

Photo TV payload rising on a plume of pons, and an 8-channel, ft-bit analog-to-digir till converter. Motorola runs a Freeware BBS in Texas with cross-assemblers. BASIC interpreter called BASICI.1 , hex monitor Buffalo , C cross-compilers, and more, for this micro. The iiross-asscmblers and cross-compilers arc ported to the Apple Macintosh, Amiga, and IBM PC XT'AT clones. The BASIC 11 was fast enough to hook the vertical nc gt the interrupt on the micro and ha e the video overlay time-stamp each...

1

We started preparing for the launch early in the morning. I set up my ATV receive site a hundred or so feet f rom the launch pad u ith a backup receive site down the road. The site got the bes3 ideo using a simple Radio Shaek corner reflector. We also had a third receive site, the ARROW Communications Association ATV repeater W8MNT R 20 miles away in Ann Arbor, Michigan. By early afternoon we were ready lor launch, although with some minor problems. The video transmitter was interfering with he...

Total Order

Transmitter Power Meter Schematic

In our continuing effort to present the best in amateur radio features and columns, we recognize the need to go directly io Ihe source you the reader Articles and columns are assigned feedback numbers. whfcft appear on each article column and are also listed here. These numbers correspond to those on the feedback card opposite this page On the card, please check the box which honestly represents your opinion of each article or column. Do we really read the feedback cards You beM The results are...

Oks

LL Grace, Inc. 41 Acadia Drive Voorhees Hj 08043 Tel 609 751-1018 Price Class 39. Let the computer do the work while you do the operating. A bout I wo years ago I became interested in space communications. and in working OSCAR 13 in particular 1 already had most of the necessary equipment including an old ICOM IC-2U 2 meter all-mode rig and a Microwave Modules 432 MHZ transvener, All I lacked were the uplink and downlink antennas. I considered building these but finally opted lo purchase...

Amateur Radio

IL 60015 001 292-7711 708 M1-0710 15 Day Money Bach Guarantee 2 Year Warranty WRITE FOR FliKfc CATALOG Selling 73 Amateur Radio will make money for you. Consider the facts If you carr gt 73 Amateur Radio it u ill increa e our store traffic and our dealers tel us that 73 is the hottesi selUn amiitctir radio mii j inc on the new s-stand today. Increased gt .kire traftk means increased sales lor you. Hams h-v 11 come into your store U gt ick up the latest issue of 73 and...

Proconim

Vhf Uhf Radio

1948 Coventry Court Thousand Oaks, CA 91362 805 497-2397 TORX, HF, VHF. UHF and Microwave bards dited repair, hut Yaesu did noi have thai t pc of service. Tonur knowledge, no company offers expedited repair, but Bill ends his letter hv writing that the service was disgraceful Ken Freeland WIANF sent his FT-980 in for a power supply 24 volt regulator ft . The repair cost about SUM, which he felt was a little high ' hui he gives the phone personnel stars for iviujj helpful. Margaret Foster WA6BWH...

Buperfast Wiorse Code Supereasv

LEARN MORSE CODE IN i HOUR Amaz ing rrew Supereasy technique S10 Both Si7 Moneybach guarantee Free catalog SASE Bahr. Dept 73-2. 1196 Citrus, Palmhay FL 32905 BN0531 SB-220 221 OWNERS detaiied mods which include 160-6 meter op raiion. OSK. enhanced ps rebatf lor riew mods suomiTiod' 9 pages of 3-500Z tech into SiT postpakL- nfO. SASE, BOB KOZLAREK WA2SOO, 59 Memonai Place. Elm wood Park NJ 07407 BNB551 C I A L S KENWOOD TS-930S gt WAT S1349 90 TS-940S WAT 51695 90....

Santec Wattmeter W710 Adjustments Hf Wattmeter

WHYNOT command - Shows reasons why some received packets are not displayed. Packet Dump Suppression - Prevents dumping unsent packets on the radio channel when the link fails. CUSTOM Command - Allows limited PK-88 customization for non-standard applications. Enhanced MBX command-Permits display of the data in I- and Ul-frames, without packet headers and without packet headers or retried frames. Enhanced MPROTO command - Suppresses display of non- ASCII packets from Level Three switches and...

Sh

AKIU n Low Band OXing IIlh . to meet the ehalU n ofthc diiferent lL gt rmi of 0r tnd JO TKtet propt aUiiti iib cffctti jntt nju , cquipmcfli. jopemE irt , itra lt epiei. 10,00 Aft OL - Vour Goteway to Packet ftadio 2nd Edition h'illed with iafoftnal mn for all lie 11.1 eufi I etk everything you nculI io kno qhnFui th 1 v poplar n w mude Hn.na 1 c ef -urKLt. equip rncnt need, ind n--TTC 412.0 1 TFm New FditicHi is .ilmost Laiier The tqlor al . tupiera 111 the 1 run . lt 1 ihi book i t , .1 111...

Sony Hvm-322q Camera

Figure, The WA6HTP Live Television Helicopter Selecting a transmitter was easy. One look in the radio amateur handbook convinced me that it would l gt e simpler to purchase one ready made than to build one. I decided on a one-watt 450 MH transmitter from PC Electronics. It also has an audio subcarrier For my camera, a friend loaned me a very small Sony HVM-322Q monochrome designed for surveillance use. About the size of a pack of cigarettes, it weighs 6.7 ounces and draws 0.9 watts....