Edited By Bryan Hastings

73 Magazine proudly announces the arrival of its new Associate Publisher, Jim Morrissett K6MH. Jim brings much amateur radio magazine publishing experience to the post. He firs started at CO Magazine as Associate Editor in 1955, when Wayne Green was the editor. Among his interesting tasks there was atrip to Antarctica in late 1956 and early 1957 to serve as a correspondent for CQ Magazine. Later, Jim wore many hats on the staff of 73 Magazine during its tender beginnings in New York City in the...

Send For Free Catalog And Price List

The Mode L uplink antenna and some of the crew at the N5EM Field Day station. From L to Ft WA5ZIB, N5LKJ, WB5HLZ, N5EM and N5HQM. Photo C. Battery power with solar charging and Mode L operation with a four-foot dish at the N5EM Field Day site near Galveston, Texas. (N5LKJ photo.) Andy MacAllister WA5ZIB 14714 Knightsway Drive Houston TX 77083 Working DX via satellite is inevitable if you make any contacts at all via AMSAT-OSCAR-13. Pile-ups are few, even on the rare ones, and...

Radio Manual

Simple, high' performance old-time shortwave radiosl All of the secrets are here the circuit diagrams, parts layout, coil specifications, construction details, operation hints, and much more This is a compilation of shortwave construction articles from Short Wave Craft magazines published in the 20's & 30's. It's wall-to-wall how-to. Included are circuit diagrams, photographs, and design secrets of all shortwave receivers being manufactured in 1934 including some of the most famous SW-3, the...

Ggte Morse Tutor

Morse Tutor runs on any MS-DOS computer, with as little as 128K of memory, and easily matches the clock of most users' machines. The Morse Tutor program offers the user a choice of two methods of Morse code instruction Standard or Farnsworth. The Farnsworth method allows independent character and word speed settings Morse learners can set the character speed at the goal speed, which means they don't need to relearn a new sound for the same character as their copy rate picks up. This program...

The Twin Bander

The A LI' Lt i Miidei DK-37 is a dual band transceiver offering small package. The independent main band and sub-band operation duplex operation. The front panel is easy to read and understand. The display lets the operator know at a glance which functions are in operation. The built-in duplexer has a single antenna output for a dual band antenna. LINl has listened to the consumer and in response has created the versatile l 5'v- I which is truly user-friendly with minimal effort.

Kenwood That

The TH-25AT is a full-featured programmable 2m HT. It's small, rugged, and the case is water resistant. The LCD, mounted on top, has a bar graph S-me-ter which also functions as a battery voltage indicator during transmit. It has a lock switch to prevent accidental frequency changes. The LEDs are surprisingly bright, making the display easy to read in the dark. A 600 mAh NiCd battery comes with the TH-25AT. There is an automatic battery-saver circuit, and an optional AA battery case. Pius,...

Info

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Super Yaesu

SUPER YAESU FNB-4SH. 1 volts. 1000ma, double Ihe capacity of the Yaesu FNB-4, 5 watt output. Rapid charge only. S71.00 SUPER YAESU FNB-3S. 96 volts, OOma triple The capacity of the vaesu FNB-3. 3.5 watt output. Haoid or wall charge. S65.00 Botn are pe-leci for the 03, 09 and 727 series radios and are 4 inches hign Kenwood PB 25. 25H. 26 25.00 Icom BP-3 SI8.95 Exact replacement FNB-2 Nicad pacx for Vaesu FT-404R 207R 208R 708R 2250 Ri-i line for Yaesu 4n Bil 470. FN6-10 11 12 14 available. Air,I...

Ham Trader Yellow Sheets

Buy, Swap, Sell ham radio gear. Published twice a month. Ads quickly circulate, no long wait for results. Send business size SASE for sample copy. 15 for one year 24 issues . P.O.B. 2057, Glen Ellyn IL 601382057 or P.O.B. 15142, Seattle WA 98115. BNB741 electronic parts, components, supplies, and computer accessories. Send one dollar for 1 -year subscription to our 40-page catalogs and their supplements. Get on our mailing list. BCD ELECTRO, PO Box 450207, Garland TX 75045 or...

Sales Amateur Radio Service

Texas 7fi23B 5l2 gt 68O-611O FAX 512 amp 47-B 7 CHRISTMAS SPECIAL LIMITED AVAILABILITY A limited supply of Uniden 2600's with RIT ON OFF, Repeater splits, sub audible tone, mike and power cable. Cash price 284.95 plus shipping Also Available Complete line of Uniden professional Two-Way products at discount prices. Serving the radio amateur who needs more I than an amateur radio. I 11791 Loara Street, Suite B . J Garden Grow, California 92640 J,a Tel 714 638-8407 FAX lt...

Circle On Reader Service Card

900 MHZ LINEAR POWER AMPS. 1 w IN 17w OUT I. HUHHVILi- -. gt Li fc-ta. - MWI -gM- , I. HUHHVILi- -. gt Li fc-ta. - MWI -gM- , V-' L . POV.'iRAWP1.1r 5RSi ' . Bit. TPAKSSTC-FS Ir-.rj making a jumper plug to reconnect them when needed. Follow the instruction provided with the NB-96 and with yourTNC. The NB-96 instructions covered the interfacing of the modem to the TNC and gave general guidelines ior interfacing the modem TNC combo to rigs. As the product is still quite new, here's still not much...

Heathkit Hk

The Heath HK-21 TNC is a compact, self-contained TNC with a built-in personal packet bulletin board system PBBS . It measures 21 2 W x 1 H x 4Vi L with no cables plugged in. With the internal battery pack, the unit weighs about 5V2 ounces. This unit draws very little current. In standard 12 volt DC use, it draws a little less than 40 mA. The optional NiCd battery pack is rated at 120 mAh, and is charged whenever external battery power is applied. The HK-21's PBBS is quite complete. An outside...

Alinco

The DR-570T 2m 70cm dual-band mobile transceiver is the successor to Alinco's 24T. It has independent main band and subband operation, which allows full duplex operation, low power, four scanning memory, programmed, busy channel, and free channel functions, full reverse operation, priority, call, and ABX functions. The 37 selectable sub-audible tone frequencies can be called for encode or encode decode tone squelch CTCSS , permitting private access. The front panel is easy to read and the large...

Pac Comms NB High Speed Modem

Dramatically increase packet data rates without buying anew packet system. PacComm Packet Radio Systems 3652 West Cypress Tampa FL 33607 Price Class 100 modem card Tel. 813 874-2980 Looking for a way to get on higher speed packet but don't want to spend a bundle These reviewers recently discovered a product that gave them many times faster packet operation without having to change rigs. In a number of cases, readers will also be able to use this modem without having to significantly modify...

Product Of The Month

PALOMAR ENGINEERS SWR amp POWER METER Paiomar Engineers announces a new deluxe SWR and Power Meter, Model M-835, which gives accurate readings continuously, even during CWorSSB operation. It has four power ranges 2, 20, 200, and 2000 watts. Both power and SWR are displayed continuously on 6 light bars with 3 resolution. The M-835 operates from 1.8 to 30 MHz, and requires 12V DC. The meter sells for 190. The AC adapter is 15. Send for a free catalog from Paiomar Engineers, PO Box 455, Escondido...

Ramsey Electronics

Joe Moell K amp OV PO Box 2508 Fulierton CA 92633 My last column introduced you to Time Difference Of Arrival TDOA RDF methods. There, I described how a narrow aperture TDOA system uses two or more vertical antennas spaced less than a half wavelength apart. The relative differences in distance between each antenna and the transmitter cause phase differences in the signals into the receiver from the antennas. Switching back and forth rapidly between the two antennas gives a superimposed tone on...

Delta Loop Dl

The DL-102 is a V-shaped 10m beam with the element tips connected together with copper wire. A 5-foot boom supports the arms elements . The elements are attached to the boom by heliarc welded element horn clamps. A mast mounting bracket attaches the boom to the supporting mast. This antenna exhibits the same general broadband characteristics and electrical properties as full-wave loop antennas such as the quad. Some of the other interesting specifications are weight 21 lbs., element arm length...

Linear Amps

BARKER amp WILLIAMSON PT-2500A HF AMP The PT-2500A 1.5 kW amplifier is a superb Class AB2 linear amplifier, rated for continuous duty at 1500 watts output. The PT-2500A offers excellent performance for any mode or style of operation, even HF packet. The PT-2500A uses two Eimac 3-500Z zero-bias triodes, tried and true workhorses in many HF amp designs. There is very little intermodulalion distortion - 33 dB , and the amp has a minimum of 60 percent plate efficiency on all HF bands. The output...

Coaxial Dynamics A Rf Wattmeter

Get Bird quality without paying Bird prices Coaxial Dynamics' Model 81000A is a handy, portable, and economic wattmeter for measuring RF power. It includes a large, clear, easy-to-read meter scale with a mirrored backing, to eliminate parallax error. You can choose from a full line of economically priced detecting elements to cover 100 milliwatts to 10,000 watts. The Model 81 OOOA's frequency range covers 0.45 MHz to 2300 MHz. Standard elements are available from 2 to 1300 MHz, others on...

Instant Track

Instant Track is a high-end satellite tracker IBM PCIone program that carries a very low-end price. It is full-featured and a joy to use. The main menu lets you edit your station elements, any of up to 200 satellites in its library, and gives you a choice of functions. The startup screen even gives favorite satellite statuses, so you instantly see if they're up or down. You can graphically display an excellent Mercator projection of the world, on an EGA VGA screen, with locations of sun, moon,...

Wsomv

A comprehensive manual covering Radioteletype news monitoring contains all information antenna, receivers, terminal units, plus three extensive frequency lists. Covers 65 World Press Services broadcasting in English. The Original Press Book. 84 pages. 05E03 First Book of Modern Electronics Fun Projects Edited by Art Salsberg Looking for a way to have fun, increase your technical expertise, and save money all at the same time This unique compendium, chock-full of projects, will show you how....

Circle J On Reader Service Card

Sitor B TDM-Moore FDM ASCII Low ASCII High Literal Bi Inversion Var. Speed DaSabit FAX Tfiismilitaiy-grade surveillance decoder offers the ultimate in sophistication and performance for the serious teletype listener. No computer required. Too many features to list here. Write for complete technical specifications. From 1280 A'ida Drive Dept. 73 Raynoldsburg, OH43068 Toll Free 800 431-3939 In Ohio 614 866-4267 Huge 70 Page SWL Catalog Available for 1 Refundable Put your elec-tech knowledge to...

Uniden

Uniden Corporation of America has purchased the consumer products line of Regency Electronics Inc. for 12,000,000. To celebrate this purchase, we're having our largest scanner sale in history Use the coupon in this ad for big savings. Hurry. offer ends March 31, 1990. Get special savings on the scanners listed in this coupon. Ibis coupon must be included with your prepaid order. Credit cards, personal checks and quantity discounts are excluded from this offer. Otter valid only on prepaid orders...

Toroid Coil In Hf Radio

Flavorig 73 Amateur Radio November, 1989 sistor and its associated components , and replacing it with separate oscillator and mixer stages. With FETs and simple toroid coils, it's as easy as pie Flavorig is an 80-meter, Novice band 5 watt CW transceiver, built around a Radio Shack Fiavoradio , which sells for 6.95. It includes an RIT circuit, sidetone, and minikey, and it operates on 10-14 volts, making it ideal for portable use. As much of the original radio as possible is used. In...

Interconnect

ISI , VCS-2100, uses a combination of VOX control from telephone line audio, and sampling of receiver noise, to achieve the optimum control method for a simplex interconnect. No sampling interruptions occur during normal conversation. Turn-a-round beeps make operation very smooth and easy. The VCS-2100 features the ISI exclusive, Automatic Setup. This feature eliminates the trial and error method of sample window setup. Our Quick Start Set-up procedure gets the...

Yaesu Frg Vhfuhf Receiver

Awesome frequency and memory coverage in a VHF UHF scanner receiver. Yaesu USA 17210 Edwards Rd. Cerritos, CA 90701 213 404-2700 Price Class 610 Have you wondered what goes on in the VHF UHF portion of the radio spectrum You've probably worked some 2 meter FM and maybe some 440 MHz stuff but there's a lot that goes on in the world between HF and microwaves. For instance, from my location, I can tune into a series of high-flying, radar-equipped balloons used to interdict low-ffying drug...