N

1009 Garfield St., Oak Park , Illinois 60304 KLM 144-148-11 2 meter beam 47,95 c KLM 144-148*14 2 meter beam 65.95 d KLM 144-148-16 2 meter beam_______ 72.95 d KLM 219-226-7 220 MHz beam 28,95 b KLM 219-226-9 220 MHz beam 29.95 b KLM 219-226-11 220 MHz beam 32.95c KLM 219-226-14 220 MHz beam 49.95 d KLM 420-470-6 UHF beam 19,95 b KLM 420-470*14-UHF beam 31.95 c STANDARD BALUNS for abv beams. 24.95 b

Framingham Ma

The Framingham Area Radio Association will hold its indoor electronic flea market on Sunday, November 11, 1979, from 10 00 am until 2 00 pm at the Framingham Police drill shed behind the police station. Framingham, Massachusetts. From Rte. 9, take Rte. 126 south to the center of Framingham. Sellers' setup time is from 9 00 am to 10 00 am, Advance table reservations will be 5.00, with tables available at the door for 7.50. Refreshments will be served outside the flea market area. Talk-in on 75...

F

MM5J69N fone or frequency burst schematic and block diagram, cult to find 74C90s that operate at 16 MHz. So far we have touched on the parts required to have a crystal oscillator but we don't have a source of power to run it yet. The power source see Fig. 6(a) and (b) is a simple voltage-regulated source that will help eliminate the aforementioned abnormal voltage drop ' It consists of the usual transformer, full-wave diode bridge, and capacitor arrangement followed by a really neat...

All Band Trap

FULL 1 4th WAVE - All Bands Automatic Selection with proven Hl-QTrapa, 3 MciiJels-ALL self supporting - Ground or roof mount HEAVY Double wall seamless Aluminum lower section - Hi IMPACT POLY Low Lois Pontic Cover OVER-ALL. NO WOBBLY, LUMPY TRAPS - NO UNSIGHTLY CLAMPS needed - Same lie all the way up - 1 V4W - Traps hidden Inside, You cap use It In a 1 ft, sq Backyard Neighbors will never know this ks a Hi-Power ALL Direction DX Antenna. FOR APART MENTSt ROW HOUSES, MOBILE HOMES - CONDOS etc,...

Rts

Source listing for the message and keyer program. chip If PI30 could sink enough current, it might drive the relay directly, but I preferred the buffering shown in Fig. 1. Mark elements of the Morse code are sent by decrementing (DEC) PB0 for the appropriate length of time, i_ The program idles in the loop starting with JSR GEIKEY and ending with BNE RPT, testing each of three keys (A, Br and C) to see if they were depressed. If no key is depressed, the program remains in this loop. If...

Electronics

CuOC Co -i ' DC.- ,. c omfm p i 305 Airpoa Road Oceanside, CA 92054 71d-757-7525 The last time I went on a Field Day outing was In the early sixties. I was a member of an organization known as the Flatbush Radio Club Of Brooklyn. New York, and we took to the hinterlands of New York City, The place was Prospect Park, which sits in the center of Brooklyn. OK so It wasn't really the hinterlands, it was fun, but through the years the memories of that outing grew faint. Since moving to California,...

Flesher

*RTTY REGENERATIVE BAUD RATE CONVERTER TTL compatible connections For direct hook-up to the TU-170, also adaptable to other units. Stable crystal-controlled oscillator m 128 Character storage capacity with storage status meter to show buffer fill ** Continuously variable character rate Connect to your receiver speaker, transmitter microphone jack, and teletype machine and you're on the air. Ideal for MF and VHF auto start operation, Autostat with threshold control and solid state relay * Stable...

Info

Buitd a Startleet Communicator -Trehkies specias Svnihesrzea IC Fr quent. Standard You Can Make Photo DC Hot* s ou' Quality iSCtl to Baudot converter RT7 v Autocall the Digital Way, Improving in FT 101 Night DX'ing on 10 and I5rr- Reaily Soup Up - cur 2m Receiver Put i )ui SB u n ififim MAY 76. Special Antenna Issu 1 Trie Mag nsricent Sevens Microheii* An AMbanti In vejied Vee Closed Loop Anlenna Tuning, The 75 80m Broadtiander The Magi< ot i Matchmaker, How to Coax Your Antenna 40m...

Selectone

Nounces an mentary way to add tone control to your radio system Wow you car control repeaters, add selective calling to your system, or protect remote base stations and autopatches from interrnod and interference. All SELECTONE umis are fully tunable to any desired frequency (no reeds, resistors, or frequency elements required), sub-miniature in size to fit almost any radio, and carry a full 2 year warranty. Call us TOLL FREE for more information on these exiciting new products. ST100...

Soq

FrfcmtnCy rmQf fc Hi to 55 ijOOmH *ith CT OO Piiy JG l sac gate i hr hpc gain Ai Jfac* dd ljtne lo 0 i Of SiabllrTr 0 ppifi Ove* TO to JO c temper atUT> compeflMUd inpuT BNC * jn giftiTi 20 pi dired 50 Ofcm CH-1M OtrrkM SflVAt nujumufli all modes Sens tcv '< , ess injn 5 rmv lo 65 in 60Q Patn 110 VAC 1. Waif* or VDt aOO mfl Siit ti * 4 t i ' mgh qujitlv aluminum tdte fCS 13 unit* JII socketed Tne CT-50 is a versatile and precision frequency counter which measure frequencies to 60 rnHz and...

Umk

Thousands of personal and business systems around the world use this board with complete satisfaction. Puts 16K of software on line at ALL TIMES Kit features a top quality soldermasked and silk-screened PC board and first run parts and sockets, AM parts (except 2708s) are included, Any number of EPROM locations may be disabled to avoid any memory conflicts. Fully buffered and has WAIT STATE capabilities. OUR 450NS 2708'S ARE 56.95 EA. WITH PURCHASE OF KIT

Dtss

LEAVE A MESSAGE & WE'LL CALL YOU BACK 1508 McKtNNEY * HOUSTON, TEXAS 77002 AIJ prices fob Houston, except where indicated. Prices subject to change wrthout noifce. all items guaranteed. Some items subject prior sale. Sent) feuerhead tor Dealer price Us . Texas residents add tax please add postage estimate, S1 00 minimum, W5GJ, W5MBB K5AAD N5JJ AG5K. W5VVM WD5EDE, K5ZD, WA5TGU, W85AYF, K5RC K5BGB WB5USV

Final Rf Tube Fm Transmitter

George Hovorka WA PD Y John Hovorkat Jr. 674 Brush Hilt Rd. Milton MA 02186 The 1G502 is an excellent 6 meter transceiver for the money, but sometimes a little more power is very useful, es pecially during skip openings. Here is a linear amplifier that you can butld at little or no cost, which runs about seventy Watts input. The heart of this amplifier is a surplus tube-type low-band Motorola FM transmitter strip. 1 bought mine for 1 OG at a local hamfest Only the final amplifier ot the...

Television Handbook For The Amateur

A large number of hams are professionals in the field of commercial television. Their dally involvement in the world of video gives them a headstart in understanding and operating a fast scan television station. The rest of the population shoutdn t be discouraged, though. The book, Television Handbook for the Amateur, Is a real help sn bridging the gap between beginner and pro. Television Handbook is published by Aptron Laboratories and a paperback edition costs 6,50, The author, Biagio Prestl,...

Temtec

Light wt Portable Alternator Stand-by power for Ham Equipment, household needs during power outages or operation in remote areas Operates lighting, refrigerators, heating systems or other appliances including freq. sensitive loads such as TV sets, induction motors and fluorescent lights. Solid-State voltage regulation. 3750W rating 25 sutge capacity. 120 240V at 31.3 15.6A. 8 HP 3600 RFM B& S engine. Alternator draws just enough engine output to meet load resulting in up to 25 fuel savings....

Clairex Photo Cells

These have a real USEFUL range to them. Any project involving control from ambient light levels will utilize this photo cell Light resistance 1K, Fast response ,156 Diameter. ,75 anchor 2 1,00, Ftachargeable Ni-Cad calcuialor WITH MEMORY EX.CS AND KEY 4.95 ea. owners manual and charger are not hinged-top box for storing all your small pans, O.d. by 3 ' by 2 . .75 ea. 10 5.00. REPEAT OF A SELL-OUT A complex 12 hour digital clock. Some are manufacture line rejects, some are reiumg, and some are...

Kit

VHY BUY A 600A Because 95 oi he assembly 5 completed by DSf md you are only one hour away from solving all Those difficult oench ems, from sailing the frequency of i audio signaf to within 1 10 of a tc checking the frequency of a 486 MHZ mobile radio. Whether you e servicing a VTR trouble shooiing a PLL. circuit, ihe560GA is the right ounter with accuracy that win meet any FCC land mobile, broadcast, or telecommunications requirements. On the bench or in the field he 5600A witl do ihe job you...

Rtm Transceiver

Covers 136.00 to 149.95 Mhz In 50 Khz crystal-controlled steps 15 watts output. Has volume and squelch controls requires 27 voce amps. With tubes 8156, 2 8102, 5 6CW4, and 2 75B7. 0 A size 6-3 8x3-1 2x14, 10 Ebs, sh. Used, no covers 54.95 R-390AJURR RECEIVER 2 to 32 Mhz AM in 1 Khz steps mechanical filters. Used reparabfe 295 Checked 450 Manual 12.00 50-2000 pf, 3 KV Right-angle manual tune drive with 1 4-3 6 d-ia shaft. On 5-3 4x3-1 4x3-3 4 mount bracket. 0 A 10-3 4x3-1 4x5, 9 lbs, sh. CeiS...

The Hkm

Ham Radio Center has introduced a new modified straight key which replaces their popular Model HK-3 Ham-Key , The new model is the HK-3M it features a new anti-tip bracket lhat defies even a pump-handle type of operator from tipping over. The beauty of this new feature is that any HK-3 now1 in the field can be converted to an HK-3M by merely adding the easily installed AT-B bracket. For further information con tact Ham Radio Center PO Box 28271r St. Louis MO 63132. Reader Service number H2. I...

W Znm N N

110V Zener 1W- Better than an OB2 DC3 ftlPiy Dual Transistor 3mV Match 100 M'Channel RF FET 100MHz Amp PftIP Dual Transistor 5mV Match i 250 N Channiil FET 5ii Switch 2N5394E UJtra ow Noise J FET Audio Amp 2N5912 Dual J-FET RF Oil Amp to 800MHz 2N6028 Programmable Unijunction Transistor 2N6449 30G Volt N-ChanneL J FET Amp Sw CP640 Broadband FET RF Amp 14QdB Dyn Rang E304 N Channel RF FET 3 amp dB MF 400MHz MPSA12 PN Oarlington Transistor J2fl,000 TIS88 N-Channel FET 400MHz RF Amp RESISTOR...

Arrl Intruder Watch

Our recent comments concerning the woodpecker and other unauthorized encroach ments into the amateur bands seem to have unintentionally opened a Pandora's Box of complaints directed at the ARRL sponsored Intruder Watch program, Now, before you groan and say, IHWon't those guys at 73 Magazine ever get rIred of blasting the ARRL , let me assure you that Dallas is a long way from Peterborough and that the editor of this column has been a League member for over twenty years and has no axe to grind...

Family Of Fine Amplifiers

The 2KD-5 and 2K-4A linear amplifiers completely fulfill the needs of discriminating amateurs who want the very best and are willing to pay the price. But we have long felt that many amateurs would be satisfied with less power if they could still have the same high quality and dependability. Tlie 1KD-5 fulfills that need beautifully. Quality that is unmatched in any other linear in its class The same high standards of engineering and construction as the 2KD-5 and 2K 4A Heavy duty components...

System

Capable of handling the Legal Limit, the SYSTEM 33 is the finest compact tri-bander available to the amateur. Designed and produced by one world's largest antenna manufacturers, the traditional quality of workmanship and materials exceils with the SYSTEM 33. New boorrvto-element mount consists of two 1 8 thick formed aluminum plates that will provide more damping and holding strength to prevent element misalignment. Superior clamping power is obtained with the use of a rugged thick aluminum...

To Low

The remote-site dipote first each time, and if the frequency reads all right, then any differences should be in the path not likely at Vi mile, but weather affects tt some or in the receiver itself, due to some factor such as temperature orating. Then you proceed with your test antenna, compared to previous antennas, and the reference dipole using the avc voltage reading on a separate rf-wired channel. Ustng the separate wired channels of rf allows continuous monitoring of all, simultaneously...

W

In So You Want to Raise a Tower July, 1979, page 110 , Photo J shows what appears to be a vertical stacking of the cable lengths under the cable clamps. The cable lengths should be positioned in a horizontal side-by-side arrangement such that both halves ot the cable clamps contact each side of each cable. in relerence to At Last A Really Simple Speech Processor, June, 1979 Thanks to W5VSR for pointing out the need for a circuit change. A 10k pot should be added at the emitter of the first...

Trac Cmos Electronic Keyer

TRAC Electronics, Inc., has introduced an addition to its line of state-of-the-art CMOS keyers The TRAC CMOS Electronic Keyer. Model TE133, contains all CMOS integrated circuitry. included features are self-completing dots and dash es both dot and dash memory iambic keying with any squeeze paddle 5-50 wpm speed, vol- ume, tune, and weight controls speaker. Low-current-drain and built-in sidetone and CMOS allows portable battery operation. The rear panei contains deluxe quarter-inch jacks for...

Attention Elf Owners Announcing Quest Super Basic

At Last a Fill Slzt Basic for 18Q systems A a gt Rpiert funcikxi Basic ir gt cludjng t o dimensions arrays variables itoahng pant arrthrnetic and 32 M Signed mtegef arithmetic OGft KCuncyiwitibH routines EaslyaiaD-iabteon most 1002 systems Acquires 12KRAV minimum for Baste and user programs Cassette version in siodc mow for rmrnediaie delivery ROM versions coming soon with exchange privilege allowing cr amp dl for cassette version. Super Basic oil Cassette 40.00 Tiny Basic Sourct- now available...

Nye Viking Receives Fcc Registration For Phone Patch

Munications Commission for official registration under Part 68 of the FCC Regulations has been granted to the Wm, M Nye Company. Bellevue WA. This allows the Nye Viking phone patch to be plugged directly into the telephone line without the need or cost of a telephone company-supplied coupling device. It should be noted that users must still notify the telephone company that they are connecting the phone patch to the telephone line, and must furnish the company the official registration number...

Dentron

Covers 160 thru 10 meters and has a total length of 130' 14 ga. stranded copper although it may be made shorter It is center fed through 100F of 470ohmPVC covered, balanced transmission line. Assembly is complete Antenna tuner required. Tunes 160 thru 10 witti 1 antenna Now you can tune-up off the air with the Big Dummy it has a flat SWR, full freq. coverage from i fl to 300 MHz and a high grade of industrial cooling oii furnished with the unit F u iy assembled Cut out the QRM factor now'...

Efp

1ft HLUtUOd LOSTBOl S VtiK iQl iot TV itnic t. hcwit rtf, CAfACltOt iPfClAL. m Urt. nd nm h-HOIIV YCHTAGE tECL ATO Sr 1M-3OT 1 t TO J laUiMl IS M tL SWTriftfS. liid . Urtjrw . iit 2 1 fcS ttsisto St CI, 1 h gt t Jit. tvham. cirtK lilnw rtt - - VOl T ACI tECUUlTOiiS., 5 IO 2 rfn lO 12V ----- CAPACfTOtS, Til ilurt wtti C i ' . THE i MIST O millOH lK t ctunB llh itw ipm tff jlyrr. 6S-1 WATT Iibiv70t5 if d m i l Mlfli. nwM. lt fS7 71 1-11Vl gt t SPOT IttAV 1B0 ohm coil. 25 mA. . IS-VOLUMf COJ...

Ac Qk

Eliminated on both CW or SSB with no trouble. So far, there was little difference between the units. I found, however, that the newer filter provided a few operating features not found in the QF-1 For example, the on oft switch now automatically bypasses the filter when it is turned off. When using the GF-1t you had to unplug the speaker or headphones and plug them back into the transceiver or receiver when you were not actually using the filter, a minor but not In significant annoyance. The...

Hammarlund

1 have been trying hard to find a replacement variable tuning capacitor for my Hammariund HQ-170A VHF receiver and finally found one at Pax Mfg,, 100 Montauk Hwy., Linden Hurst NY 11757, 516 884-4300. In talking with Mr Peter Kjeldsen of Pax Mfg., he indicated that they have most replacements for Hammariund capacitors. Maybe this infer rnation will help someone else find parts. As printed in Letters'1 of the June, 1979, issue of 73. reader K6EGM is appalled that you could publish something The...

Four Bands on a Bamboo Pole

try a Chinese vertical slanter on William ft. Stocking W9VM 1030 Wcidman Road Manchester MO 63011 Many of us hams like to work DX. My friend, Harry, who lives down the street, had worked many DX stations I had worked no DX at all I asked Harry what could do to work DX. Get a long, bamboo fishpole and build a vertical j like mine ' he replied Get the bottom ot the antenna higher than the electric light wires Get the thing resonant, and you'll work across the big pond ' Harry was my consulting...

Toll Free

PRE TUNED - COMPLETELY ASSEMBLED -ONLY ONE NEAT SMALL ANTENNA FOR UP TO fi BANDS EXCELLENT FOR CON GESTEO HOUSING AREAS APARTMENTS LIGHT - STRONG - ALMOST INVISIBLE FOR ALL MAKES 6. MODELS OF AMATEUR TRANSCEIVERS - TRANSMITTERS -GUARANTEED FOR 2000 WATTS SS8 1000 WATTS CW INPUT FOR NOVICE AND ALL CLASS AMATEURS COMPLETE AS SHOWN with 90 ft. RG5BU-52 ohm feedllrre, and PL259 connector, Insulitort, 30 ft. 00 lb. test dscrcn end supports, center connector wiltti bultt In llghnlng arrester and...

Ej

SoT when I say 54E what I mean is 01001110. Now, in ASCII, that 4E corresponds to IsT. Lowercase n is S6E, which is 20 more than 4E. That is, 4E 20 6E, Another way to look at that is by converting the hexadecimal to decimal. 4E is 78 decimal, and 20 Is 32. Thus, 78 32 110, and 110 decimal is 6E hexadecimal. If everything is clear so far, I'II throw in one more loop. The ASCII we ihave been talking about is a seven-bit code, but the hexadecimal representation is eight bits....