Radio Amateur 08-1986

Radio Amateur

925 Sherwood Dr,, Box 24 7 Lake Bluff, I L 60044, USA same a* the FM voice repealers wc are used to. In fact, any packet station can be a digipeater. Remember thai each packet station listens to every transmission on the frequency to see if that transmission is addressed lo it. it also looks at each transmission to see if it is supposed to be repeated. The addressing information specifies which stations are lo repeat the information and in what order they are to repeat it. Thus a cham of...

Affordable Packet Radio From

An identical TAPR TNC 2 clone with a new cabinet and added features for ail incredible 129.95 All you need Is your rig, home computer with a RS-232 serial port and a terminal program If you have a Commodore 128 or VIC-20 you car use IMFJ's optional Starter Pack tc get on the air immediately. Yau get interfacing cable, terminal software on tape or disk and complete instructions everything you need royet on packet radio, Order MFJ-1282 (disk) or MFJ-1283 (tape), 19 95 each Unlike machine specific...

Western Electronics

BOX 982 MARYSVtUE, WA 90270 ALSO DIPOLE5 A Lr MTEiKSPACE ANTENNAS or W tHH pnttntpt n iTXl-o- f c 9f m_lt gt b nd BIG rtpvli 1 ImIwIk bandit ithme km SWH'Coii Ho pfivtt Compact - FJJU A amp S amp L R ta iur ipti-lrafl Cfif fitr. ip i. 1 E , I g 1F.1TF TftTf 10 w mqulb camfhh iniimce fli- tdu' mrswul cahi kchm band sloped - ooiq 30 a J lAQ SO 7 - A0-I0 W -THAV UH'OIE - 160 00. 40M - J - 00, a HAND SPAC E SftVt FI DLP L t6Q 1 hm IQ M ______ -lullOS wirln .irH- IHN...

Tnc Parameters

The parameters used on the TNC are critical to how well the BBS operates. Some parameters like ABAUO and PARITY, are determined by the BBS hardware and software Others, like TXDELAY, are a function of the radios. Of interest here are the parameters that control the way the TNC feeds the packets into the network DWAIT, FRACK, RETRY, PACLEN, and MAXFRAME. These should be fine-tuned to Lhe characteristics of the network. These are TNC-1 parameters, NC-2 users adjust accordingly. DWAiTconlrols the...

Edited By Perrydonham Kw

OUR SHARPER READERS wilt notice that this issue of 73 is sightly different we've devoted nearly every page to coverage of packet radio, this month s special topic. What a tough decision' On one hand, we had an entire magazine s worth of great packet articles On ihe other, we had all of our regular columns and departments. In the background was the reality that there are only so many pages to put things on. Should we leave out important articles, or leave out the columns We look a look at what...

Standard Features

Autopatch Fieverse Patch, w Q & 1 inhibit Oral Putee Convener Autoo-aler Phone line & over the airT1 command modes. Virtually all functions may tie lurried ontoff remotely. Touch Tone Control of Timeout', 'Hang Time'. Patch Timeout, TX InhibitfReset. Patch & Reverse Patch fnhibit Rasei, P L. ON OFF (wtopliortal PI bGartf), etc. Up to 6 Auxiliary Functions* More with TTC30O. Full 16 Digit Decoding with Crystaf Controlled Decoder JC Touch Tone Mute Kerchunk Killer Unique Courtesy Tones...

Build The

A complete kit of parts, including a high-quality double-sided printed circuit board, is available from Valtey Electronics. The kit version is slightly different from the unit presented in this article a larger EPROM is used which covers two frequency pairs, and several cosmetic changes have been made to fhe PCB Order Number Description Price 88601 Digital Tuning Indicator kit 79.95 88602 Kit without enclosure 72.95 88603 Semi-kit PCB and EPROMS only 22.95 All prices include shipping and...

Ampro Little Board

Evelyn Ave. Mountain View CA 94041 Ampro Little Board 249 There is a phenomenon in a rapidly growing and changing technology like personal computers that is usually called the price knee or crossover point. This ts a point in time in which the price for an older generation of machines is dropping quickly, and the cost of the new generation, initially fairly high, is also starting to fall. At some point, the cost-effectiveness ratio crosses over, and the new...

Element Oscapt

Since you have access to the BBS any time you want it, though, and since you can transfer data faster than anyone accessing it over packet can, it behooves you to add to the information on the BBS. Maybe you're a CompuServe user and can get the W5Y Report from HAMNET. Perhaps you can get the useful messages from DRN ET, or can post the Keplerian elements for OSCAR. You ought to find some way to add to what your users post. Since the BBS is always there for someone to use. and you obviously know...

Antenna Current

Currant Probe lets you monitor RF antenna currents no connections needed Determine current distribution . RF radiation pattern and polarization ot antennas, transmission lines, ground leaos building wiring, guy wires and1 encfosures * Indicate iranjmlitlon line radiation due to hfgh SWR. poor shielding or antenna unbarance * Dotect re-radlatlon from rain gutters and guy wires that can distort antenna field patterns * Detect RF radiation from ground leads, power cords or building winng that can...

Largest Stocking Ham Dealer Complete Repair Lab On Premises

, BARRY INTERNATIONAL TELEX 12 7670 MERCHANDISE TAKEN ON CONSIGNMENT I FOR TOP PRICES Monday-Friday 9AM to 6 30 P M Thursday toflPM. Saturday A 10 A M to 5 P.M Free Parking) AUTHORIZED DlSTS MCKAY DYMEK FOR SHORTWAVE ANTENNAS & RECEIVERS iftTyLEX Spiing St. Station * Subway BMT'Prince St, Station IND F Train Bwy. Station Ccminsfciai Equipment Slocked ICOM MAXOM Midland, Standard Wilson, Yaesu We se e munie tpaMtles bysi messes. G. De'ens etc Porta Ees. mofcites hases. retiEalerS We Stock...

Controller Wd1770 Boost

The Original Ampro Lrttle Board at a Glance 7 3 4 x 5-3 4 x 3 4 One e-bit 2732 EPROM for initialization Two RS-232 serial pons, one 75-9600 baud, one 75-38,400 baud, plus one Centronics parallel printer port. One serial port is used to communicate with any Western Digital WD-1770 disk-controller chfp can drive one to four 5-1 4 soft-sector disk drives, in any combination of 46 tracks per inch tpi and 96 tpi, single- or double-sided 5Vdc 750 mA, 12 Vdc 50 mA Ttie - J 2 V dc tor the RS-232 serial...

Electronics

Elh 730 Manual Espa

ARCADIA CA 91006 (818) 447-4565 TOM W6QRG MARYANN WB6YSS_____Compuserve 72405,1207 10 pin VMS color camera and RCA phono jack video inputs, Crystal locked 4,5 mHz sound subcarrler. PTL (Push To Look) T R switching, Sensitive UHF GaAsfet tuneable downconverter. Two frequency 1 watt pep xmtr, 1 crystal included. Xmit video monitor outputs to camera and phono jack. Small 7 x 7 x 2.5' for portable, mobile, or base. Draws only 500 ma fexc. camera) ar 13.0 vdc....

Ever Say

Tures of the exhibits for use in your next year's brochure Remember to send a letter to the exhibitors after the show, getting their input and possibly some good quotes for your next year's sales pilch. You'll also get some ideas on ways to improve. The locai hams already know about your local attractions, so you don't have to lay that on 'em, but those from further out may know less about it than you think You might get them to come in Thursday night and spend Friday with their families having...

Unadvertised Specials

Phone for Information or to Order, VISA MC or COD accepted Why risk isappointment Buy time-tested Fox-Tango F fers to be sure -receded m moneys worth luSt one xssue -receded m moneys worth luSt one xssue a ways slop to tead CTM. even though most other magazines t tecerve (and write for) only gel cursory examination * Foreign S3S.OOOand 555,Q(Ha Permanent U.S Subscription) S100.00

Introduction

Microprocessors and digital communications have played a an in ili o the recenl amateur spacecraft They have usually been Photo B. Vie UoSAT-OSCAR-11 spacecraft. Ian Ferebee G6BTU is attaching a solar array panel peateron a mountain 33,000 km high, that is. A second two-way use of a spacecraft is as a digipeater. There arc several advantages to this style over the AO-10 method where packet is concerned. First, packets are checked for accuracy in orbit before being repeated. This saves time...

International Radio

747 SW South MacodoBlvd. ortSi, Lucie FL 33452 3 Amateur Radio August, 1986 93 Clark WB9EAP, 2202 South Boots Street. Marion iN 46953. The St. Cloud ARC will hold a hamfest August 10 at Lake George in St, Cloud, Minnesota, near downtown, off MN 23 and U.S. 52. S3 ticket donation. Talkin on .34 ,94 primary, .615 .015 secondary. For more information, contact SCARC, Box 141, St. Cloud MN 56302. The Mid-Atlantic ARC will hold its annual hamfest on August 10, a a.m. to 3 p.m., at the Bucks County...

Vanguard Labs

196-23 Jamaica Ave., Mollis, NY 11423 Phone J66-2720 Mon.-Thurv The DSE kit packs more features than some counters costing three Of mole limes OS much. J.Qgmvi Gitfantin Que S6 Mod ffm Else troupe Superb dQSIfln taslunrg the Istfrstl JC technology makw 1 15 kn eaby 1q build jhri nliabli- it Mflisures up 50 MH< r in < *vo range , or htghti' wuh ttie pAscalw betoWl F vturas4 gating petiadi 0 Qi no 10 seconds 7 t menr tiMptoy, 4 period mediunng rsngev high inpul sensitivity accuracy fyp*caUy...

Miracle Rods

Miracle Rod of Glasgow, Kentucky. now offers a low-temperature brazing rod for aluminum. The fluxless rods may be used with a propane torch to repair breaks in antennas, to braze cavities, and to weld joints as simply as soldering. The rods have a high conductivity, and melt at 730-740 degrees. For complete information, please contact Miracle Rod. PO Box 7911 Glasgow KY 42141. Reader Service number 160. THE FORMULA FOR TWO METER DX- MTT144 28R + MML144 200S VUCC Working the two meter band on...

Indoor Tuned Active

Or gxtftrtdt receotlon of outtide long wires Unique tuned Active Antenna minimizes intermode, improves seiei 1 vltyr reduces noise outside tuned band, even' functions as preselector with external antennj Covers 0.3-30 MHz.Tele scoping ant& nid.Tune Band,ijdinHOn-uff bypass controls.6*2x6 in Uses 9V Dattery> IBVOCor 110 VAC wttn aoaoter, MFJ-1312, 9.95 MFJ-1020A S79.95 POLICE FIRE WEATHER 2 M HANDHELD CONVERTER Turn your lyntheilred scanning S39.95 2 meter handheld into a hot Police Fire...

Motor And Gears

The heart of ttie M9230 Workshop is the B100 Interface Unit which connects td oil types o sensors and cs able to control I ghts motors - ays nd jtbtr -.utrrnal devices Tne MB23Q manual eoniflira suggestions and instructions for many advanced projects sucti as antenna positioning and relay control Available lor ihe lollowmg computers- Commodore 64 ( 129 951, Apple 2E (St > 9.95 , Atari 000 (5139,35 To Cider or tor more inform abort ca toll 'ree 1-800-624-2549 Cashier's cHecfc. Money order...

Call Toll Free

Phone Hrs 7 00 am to 5 30 p.m. Pacilic Time. California. Arizona and Georgia custom& rs call or visil nearest store. California. Arizona and Georgia residents please add safes tax. Prices, specilications. descriptions subject lo change without notice Al Ugr K6VRA San 3sego fwy at Victory Blvd STORE HOURS 10 AM-5 30 PM CLOSED SUNDAYS THINGS TO LOOK FOR (AND LOOK OUT FOR) IN A PHONE PATCH A patch should work with any radio. AM, FMT ACSB* relay switched or...

Simplex Semiduplex Interconnect

The telephone is the most powerful mode of communications PRIVATE PATCH 111 gives you full use of your home telephone from your mobile and HT radios With only three simple connections to your base station radio, PRIVATE PATCH III will give you more comnnunications power per dollar than you ever imagined possible. Suddenly the utility of your radio is drastically increased. There are new sounds.,. dial tones, ring tones, CW ID and the sound of voices you never expected to hear on your mobile or...

Apple Tekdraw

Tekdraw, a graphics software package for the Apple family, is now available from Computer Aided Instruction Systems. Using Tekdraw. you can design schematics, circuit boards, architectural layouts, certificates, charts, graphs, and so on. The Koala Pad, a joystick, or game paddles may be used as the input device. The system includes predrawn symbols which can be sefectedT rotated, and positioned on the screen. Tekdraw will save, recall, and print your designs. The software package, including a...

Qsl Of The Month

Kenwood 2600

To enter your QSL, mail it in an envelope to 73, WGE Center, 70 Rte. 202 Nt, Peterborough NH 03456. Attn QSL of the Month. Winners receive a one-year subscription (or extension to 73 Enlnes not in envelopes cannot be accepted. I give you much more than just the lowest price When you get that exciting new piece of equipment from me, you know you are going to be completely happy.,. I see to it, personally I afso give you earliest delivery, greatest trade-in allowances, my friendly assistance in...

All Our Products Made In

Quality Communication Products Since 1932 At your Distributors. Write or call 10 Canal Street. Bristol PA 1< XX)7 SPECIALIZED COMMUNICATIONS OR TODAY'S RADIO AMATEUR If you are ACTIVE in FSTV SSTV, FAX, OSCAR, PACKET, RTTY, EN IE, LASERS, or COMPUTERS, then you need THE SPEC-COM JOURNAL' Published 10 Times Per Year By WBOQCD (Serving Amateur Radio Since 1967 )

Vkqsl Bureau

From Chas Harrisson VK7CH comes an interesting repon on the last three years of the VK7 QSL Bureau, A point of interest is that there appears to be a 3,000-card shortfall each year between cards coming in and cards going out. A second point that affects all amateurs waiting for their VK7 cards, whether it be for their Tassie Devil award or just a confirmation, is the time delay the bureau has waiting for packets of cards from overseas bureaux. QSL cards for the last three years are shown in...

Receive Oscar Telemetry

Decodes satellite's housekeeping status reports, environmental data collected and plain text bulletins audio output of SSB receiver or cassette player. OUTPUT RS232 compatible serial bit stream at 1200 baud RADIOKIT J 411 S Greenville, NH 03043 RADIOKIT J 411 S Greenville, NH 03043

Type Orbits

Can vou tell that this was sen as TYPE OR BITS 134 No, and neither can the BBS system, which proceeds to send you 15 minutes of last week's orbital elements. The packet system 20 kHz up the band took three tries to get the line through, but now it's reading this week's elements. Score one for packei. W e're off the pairi again. The question was 14 ts HF packet really usable It comes down to two things hardware and user training. The RTTY community has spent many years perfecting terminal units...

Establish A Ham Testing Center In Your Area

As of 1981, all ham railm licen t is handled by tlu-ama tour radio community iiself, Teams tJbrev Extra Class volunteer examiners VE s can now conduit a I ham liccnse upgrade examinations Administermg Technician through Extra Gass examinations is no hatider than administ r Novice rsxa mi nations - which VE s have done for tetada Wt 1 er fasttsi VE accreditalion complete instructions immedi etesting v. th T stini fees (expense reimbursement) shared with Ihe VE team. Send an SAM today for a VE...

Mobile Antenna Matcher

Lower your SWR and Get more power into your mobile whip for solid signals and more QSOs. Your solid state rig outs (iut more power ana generates less heal For 10-50 meter whips. Easy plug-in installation. Complete instructions Tits anywhere, 2V x2Vim ORDER ANY PRODUCT FHOM MFJ AND TRY IT-NO OBLIGATION IF NOT SATISFIED RETURN WITHIN 30 DAYS FOR PROMPT REFUND < less shipping. One year unconditional guarantee * Add 15 00 each shipping handling Calf or write for free catalog over 100 products. TO...

Model Tuning Range Price

HRA-144 HRA ( *) HRA-220 HRA-432 HRA-( * ) 143-150 MHz 150-174 MHz 213-233 MHz 420-450 MHz 450-470 MHz (Send 2,00 or 4 fRC's for overseas mailing) Order by phone or mail Add 3 S & H per order (Electronic answering service evenings & weekends) Use VfSA, MASTERCARD, Check, or UPS COD.

Indonesia

(73 international welcomes Indonesia. and its representative. YB0BZZ, QSL Manager and IARU Region III Liaison Officer, who has provided most of the following informationi. Much of this came from a paper he and Ben S. Samsu YB0EBS prepared for last November's IARU Region III meeting in New Zealand.) Unlike many neighboring countries, Indonesia has not abolished or curbed all ham activity. All Indonesian hams must by law be members of ORAR (Organisas Amatir Radio Indonesia), and there are no...

Ham Trader Yellow

Buy, swap, sell ham-radio gear Published twice a month, Ads quickly circulate no long wait for results. SASE for sample copy. 10 for one year 24 issues . PO Box 2057, Glen Ellyn IL 60136-2057. BNB412 QSL CARDS Look good with top quality printing. Choose standard designs or fully customized cards. Better cards mean more returns to you. Free brochure, samples-Stamps appreciated Chester f you want a 2-meter tion. The I02A is aiso avail- handheld with exceptional able and...

Dealer Directory

Mirage, KLM Larvcn, AiUun, B& W 1 ivc r4000 dcaron k prafucta for the hnhhy t. Also CB and bottom* r*diov Semnp you from a 6000 tq ft wore Foniaiu Ebctro Sierra An,, KiHiiaiM CA 335. K Bjv Am s tiewaa ami tr tir raiii' itorr Ne A u ed kmuTeur radio A bi-rvicr We feaiiiit- Kenivood, ICOM, Aiden. Yucui, Ten Tec, Sam & niany mm*. Shaver Km-dloT Inc I77SA S. Winchester Campi ll CA 9500 . MQ-6MS. Tbi rtluMe harn ame trving SE. Full line onCOM& KtTwood Drtkf D I.BAW...

Lend Me Ur

Your editorial about the proposed Electronic Communications Privacy Act (ECPA) was to the point, as usual, but didn't tell your readers what to do about it Calling your Congressman s office and just teaving your opinion with a receptionist doesn't help. You have to get through to the decision-makers. I called my legislators and asked to speak with the staff member responsible for communications issues These staffers are responsible for reviewing pending legislation and often determine how a...

Expandable Repeater System

THE Hi Pro E ' IS AN EXPANDABLE REPEATER WITH THE FOUOWING FEATURES A BASIC REPEATER WHICH WOULD IN CLUDE A COMPL TE RECEIVER. TRANSMITTER. COR. FRONT PANEL CONTROLS AND INDICATORS. LOCAL SPEAKER AND MIC JACK A NO CAPABLE OF FUTURE EXPANSION ALL HOUSED IN AN EXTREMELY RUGGED. ENCLOSED, 19-INCH RACK MOUNTA0LE CABINET THIS SYSTEM CAN 3E EXPANDED AT TIME OF PURCHASE OR CAN BE AN AFTER-PURCHASE ADD ON THE ADD ONS ARE -HIGHER POWER. 1IW220 VAC POWER SUPPLY...

Amateur Electronic Supply

Fond du Lac Avenue Milwaukee, Wl 53216 Phone (414) 442-42( -AES BRANCH STORES - Associate Sto WICKLIFFE. Ohio 44092 28940 Euclid Avenue Phone(216) 585-7388 Ohio WATS 1 800-362-0290 ORLANDO, Fla. 32803 621 Commonwealth Ave. Phone(305)894-3238 Fla. WATS 1-800-432-9424 CLEARWATER. Fid. 33575 LAS VEGAS. Nev. 89106 CHICAGO, Illinois 60630 1898 Dfew Street Phone (813) 461-4267 No In-State WATS 1072 M Rancho Drive Phone(702)647 3114 Ko In-State WATS Outside i oArt c a too IRICKSON...

Aes Branch Stores

WICKLIFFE, Ohio 44092 28940 Euclid Avenue Phone (216) 585 7388 Ohio WATS 1 800 362-0290 ORLANDO. Fla. 32803 621 Commonwealth Ave. Phone (305) 894-3233 Fia. WATS 1-300 432 9424 Outside i of r on inn CLEARWATER. Fla. 33575 LAS VEGAS, Nev. 89106 CHICAGO, Illinois 60630 1898 Drew Street Phone (813) 461-4267 No In-State WATS SS 1-800-321-3594 Sv 1-800 327-1917 No Nationwide WATS 1072 N, Rancho Drive ERICKSON COMMUNICATIONS Phone (702) 647-3114 5456 ft, Milwaukee Avenue No In-State WATS Phone (312)...

Use Your Credit Card

Note Our TOLL FREE Ordering line 1-800-558-0411 is answered until 8 pm CST Monday thru Thursday. TO AMATEUR ELECTRONIC SUPPLY5 4828 W. Fond du Lac Avenue Milwaukee, Wl 53216 9 am interested in the following new KENWOOD Equipment I have the following to TRADE (What's your DEAL ) Rush me your quote I under stund that i am under no obligation

Survival Training For Mountaintop Digipeaters

11 was mid-afternoon, laic by mountaintop standards. From the ground, the clouds seemed motionless. The air was moist, still, and quiet. Up on the tower it was another story. Greg WB6ASR, leaning unsupported Photo A. Weil-dressed mountaintop equipment racks now sport computer terminals, This digipeater require s 5-1 4 of this equipment hay, 50 feet above the ground, was constructing an antenna on the tower from parts pulled from his parka pockcts, Fifty-mile-per-hour gusts squeezed the moisture...

On The Shelf

Most amateur packet bibliographies I've H seen recently are endless lists of books and articles. In this one, I'll mention only a few, hut I'll tell you why you might want to take the trouble to look them up. Most of these references contain bibliographies of their own* so you should have no lack of sources with a little effort. H. Price, 1'What's All This Racket About PacketQST, July, 1985, H. Price, Packet Radio A Closer Look ' QSTm August, 1985, These are basic introductions to packet...

Mini Frequency Counter

J.jnlr it iTI II*. h m cf- * compkci fugft wfiftitiwrly low current ifrain fry cCorait ii-l.r rtTL iJ'-T -'-g or SJV.p mhi 10 50C '- fart. iKJOt jioiecTeO * i-gii ct pLty SQQ 95 SATTERV CHANCER NICAO SATTEftlES mini kits easy to assemble, fun to use beginners & pros will have a great time with these kits sr in Hiiy ai a rji-jn'ii ugr- r1 L FwiurM rea . -r-r.t- l- a 1' i - * ' MrtMtaBir gate time gate acumtr mditatcfr tt-T-1- V i < - M I (yc rJl SETS t *...

Pr Counter Preamp

T* pr-2 il ideai o* rteesuric j .gr.afs Irom O 1 Dw MiH litf i.n r'SC OT'dsct 'i yejii lot ihtiii-Hj fif * idi , f lSiv r 'T .' c-reimp S A A Q5 wifBd ineriJ irs AC aii pl*r wail ChaiKleritlic t a m ico siror 5 WpeoK audio Output, funs Of) 3 icj irstfi 3 i t Uni d. .l IrgijLfHicJ In p HD-J i3i- .1 NULllte of (ir iE jr, 1 o ar i i'ui t oentinliLtn sh.-1 rner iC .ir,d lire 'i. IJH T - fang* 'o' *> .-si i'TOducFiSi i OUDe.Li 5n.iTlenr> L and flMention QMIlng sirfln l Ke SOund ' in Si -1 I v...