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...
Info Fql
New Technology patented converts any VHF or UHF FM receiver into a sensitive Doppfer shift radio direction finder Simply plug into receiver s antenna and external speaker jacks. Models available ith computer interface, synthesized speech lixed sue or mobile -108 MHz to i GHz. Call or write tor details. DOPPLER SYS I IS INC RO B 31819 lt 602 488-9755 ukji rLLrt IF Phoenix, M 85046 FAX 602 488-1295
I Vta
Figure 7. 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
T inri I 11 . 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
P utio G. 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 Jxt
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 1
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
Once oscillation is confirmed. 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...
Ar 1
. r- . r- L r r -' ' . - C l Hinui . j gt - gt , tj UHl TV ba t i i M - - r i i' 1 i Si-.i-i H-if kr- K s.-.nil Biinlt SeJa i il lf PfiQiit.v lt -ininncl Sei i.ib'f Ssa ii ln 2 r Jt - atnt Ail normal atTressot induded Sj a E fS Hx i 3-n-Dx2 . . W 355 Ace Comrriu meal ions of Indianapolis T H Advanced Electronic Applications 8' Associated Rad to . 63 243 AXM. Inc 61,83 AXM. Inc. 63 21 B amp B. Ir c 51 41 Barry Electronics Corporation 19 84 Broadcast Technical Service v 71 365 Suckmaster...
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...
V 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
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...
Totals
AE PMC GVISA Check Money Order _Expiration Date_ Telephone 603 525-4201 FAX 603 525-4423 Mail 73Magazine, Attn. Uncle Wayne, Forest Road, Hancock, NH 03449 in this issue we highlight a facet of amateur radio thai has really excited me for many years Fasi-Scan Amateur Television, commonly known as ATV I was in high school when J found out I could actually operate my very own television staiion from my house I immediately tore apart my parents UHF luner and modified it to lune in the two active...
J 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 1
IMS Rouviorxj. Dffrf dd. 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
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
Subliminal cassette 10. 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....
Info Ndw
Parachutes, radiosondes and Totex balloons A 6-foot strip of aluminum foil is taped to the line jum below the parachute to aid in tracking b FAA radar. A suitable parachute is available from VIZ Corp, Apply power to your pay load I almost forgot this step on two separate launches Just as you remove the balioon from its shelter. Mother Nature will probably decide to give you a hard time. It's typical to have a dead calm condition for hours before the flight, then be hit with 20-knot wind gusts...
Pk
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 1
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...
Othb
SW Division ARRL Convention 84 T70A transmitter module 50
Info Iqa
Fast-scan television FSTV has always been one oi amateur radio's lesser-known modes It is usually thought of as being one oi those esoteric areas best lei to the tinkerers and experimenters Recently, though the proliferation oi VCRs and camcorders has made many hams ihmk about what fun it would be to transmit live color video and sound, as well as home movies, to others The full-page color ads from AEA. seen for the last year jih all he major ham publications, make the idea seem even more...
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....
Kenwood Electronics Canada Inc
Cc- e e se lt r ce manua s ve avajla amp fe 'or an tfenwootf irannce vers and most accessories Specifications, features, and prrces are subfect to cm ange without nofroe or obligation MC-43S UP DOWN mtc. included Superb interference reduction IF shift, tuneable notch filter, noise blanker, all-mode squelch, RF attenuator, RIT XIT, and opt. filters fight QRM FY A built-in SSB filter is standard, I i When an optional SSB filter YK-88S or YK-88SN is installed, dual filtering is provided, II VOX,...
Info Wim
ORLANDO. Fla. 32803 621 Commonwealth Ave. Phone 407 894-3238 Fla. WATS 1-800-432-9424 CLEARWATER. Fia. 34625 LAS VEGAS, Nev. 89106 CHICAGO. Illinois 60630 1898 Drew Street 1072 N. ftancho Drive RICKS0N COMMUNICATIONS Phone 813 461-4267 Phone 702 647-3114 5456 N, Milwaukee Avenue No In-State WATS No In-State WATS Phone 312 631-5181 No Nationwide WATS m t qujpn 1 m Regular SALE IC-765 Xcvr ps kever auto tuner 314900 2699 IC-781 Xcvr Rcvr ps tuner scope . 6149 5295 IC-751A 9 band xctfr 1-30 MHz...