M Fun Loop

A low-cost gain amentia for the VHF technician. Six meters is a good band for experimenters and new hams to try out. Transmitter and receiver circuits are reasonably easy to build without exotic mechanical construction, and antennas are reasonably sized. A loop antenna is an excellent construction project that can he completed in one afternoon. It will provide gain over a dipolc without reducing horizontal coverage. Gain is achieved by reducing the energy that is normally directed vertically...

Arim

The most spectacular entry point from Sweden is the border crossing in Morokulien. This place was created to support peace efforts by Swedes and Norwegians. Photo A. Visitor operator LA2CKA enjoys using special station LG5LC in Morokulien, Norwax. Photo B. Svein Arne LAJSEA, a volunteer working for ARIM, enjoys operating this club station in Morokulien. Photo C. Eat your heart out This ham shack near a lake in Skogn has its antennas on an attached deck.

SG

I use it constantly for marine and ham frequencies with never a glitch. Operation is easy just start transmitting. Al Lee WA4EWV It tunes to near 1 1 SWR. Arnold Knadle N1JX The next to greatest thing in my shack is the SG-235 Smartuner. The greatest is my callsign. See the entire Smartuner family and get FREE QSL CARDS at www.sgcworld.com Toll free (800)259-7331 - Tel (425)746-6310 Fax (425)746-6384 Email sgc sgcworld.cQm Toll free (800)259-7331 - Tel (425)746-6310 Fax (425)746-6384 Email sgc...

Restoring an HQX Part II

This Hammarlund rig has always been a favorite. Part I of this series focused on the condition, both electrical as well as physical of my Hammarlund HQ-140-X receiver. Once it was determined that the receiver had no major electronic faults, power was left on and a series of diagnostic tests were performed to ascertain the health of the receiver. Since my HQ-140-X appeared to be functional per the original design intent, a clean-up and restoration process was then laid out. All my HQ-140-X...

Info

I do recommend the PCB, since this is a fairly complex instrument which allows plenty of chance for mistakes in the wire-wrap version. Many of the components are mounted on 18-pin wire-wrap sockets used as headers. The headers are then mounted to the circuit board. Details of these headers are provided in Fig. 6. (See part 1 for Figs. 1-5 and Photos A and B.) The prescaler is either RCA type CA 3199 E (DIP-8) or NEC UPB1509 (SO-8). You will save some work if you can locate the RCA...

Pc Board Services

Don't get bogged down with PC Board details. I have been serving Companies, Engineers and Hobbyists since 1983 with Midland Technologies 34374 Frontage Rd. Bozeman, MT 59715 800-726-8871 Examination Test Questions amp Answers lor Genera Class and Extra Class with explanations of the answers Extra Class S 14.95 Plus 3.50 S amp H P.O. Box 376 Jaffrey, NH 03452 800-467-7237 remove the enclosure cover. This filter keeps AC line noises front gelling into the counter circuits also The device is a...

H

SS-64 DIP Switch Programmalle CTCSS Encoder 8.B5 Perfect for mobile base applications TE-32 5.25 x 3.3 x 1.7 TE-32 Multi-Tone CTCSS Encoder 49.95 SS-64 CTCSS Encoder .56 x 1.08 x .21 TP-3200 Shared Repeater Tone Panel TP-3200D Table Top Version TP-320DRM-A Single Rack Mount version TP-3200RM-B Triple Rack Mount version Call or write to receive our full Product Catalog or visit our Web site for complete information at http www.com-spec.com TP-3200 Shared Repeater Tone Panel TP-3200D Table Top...

Qrh

Capabilities of each radio service in an emergency. and for radio safety out on the highways or trails. I don't see any amateur radio promotions in RV magazines, nor in aviation and marine magazines, nor in law enforcement journals ' comments William Alber WA6CAX, a ham radio instructor and reserve airborne public safety officer. Our city's Citizens Emergency Response Team CERT program encourages a close relationship with licensed amateur operators, plus our CERT members are trained on how to...

Heathkit Packkit 232 Linux

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Roll Your Own RF Transformers

Have you ever looked at a schematic that included a broadband RF transformer and wondered how the author ever determined that it should be 10 turns bifilar-wound of number 32 wire on an T375-43 core While this article isn't going to make you into a full-fledged radio engineer, with a few simple calculations, you too can design and build your own broadband transformers. This article will concentrate on low-power designs, suitable for receivers or QRP transmitters. But, similar concepts apply to...

Http Www.midcom-inc.com Pdf Tn69.pdf

Frequency response for 50 200 ohm transformers, conventional versi is trifilar- wot aid. A good rule of thumb is that windings should occupy about 75 of the core circumference. The inner diameter is the limiting factor if we wish to avoid wire overlap. Overlap increases C. and therefore hurts high-frequency response. The inner diameter of the -201 core is 0.187 inches, which yields a circum ference of 0.294 inchcs circumference ti x diameter 2 , 75 of this length is 0.220 inches. This...

Windowsill Mount for Verticals

Here is an idea for a windowsill mount for Ye Olde Fishing Pole antenna in the December 2001 issue. It should provide a reliable window mount for most antennas that would be used from an apartment where you have no other recourse in getting an antenna up for amateur radio applications. I first used this type of windowsill mount when I moved to an apartment back in Brooklyn NY in the late 1950s. If constructed correctly, it should provide you with years of...

Transmitter Hunting as a Public Service

Doppler Array

VHP and repeater enthusiasts coordinate parades, races, and every kind of -thon imaginable. ATV and packet fans help out with their speciai equipment. DXers provide communications for foreign countries after earthquakes and other disasters. What about hidden transmitter hunters Your radio direction finding RDF skills could be of benefit to your fellow hams and neighbors, and the other citizens of your community. Over the last 13 years, Homing In lias...

The Qualcomm x GHz to GHz Multiplier

This project was started last month, and describes a local oscillator system consisting of a 2 GHz frequency-agile synthesizer. This synthesizer is capable of providing to many frequencies from 2.3 to near 2.8 GHz in either 2 or 5 MHz steps. it with power oil Reapply power and retest till no increase in power can he obtained. If power drops when placing a tool with a bit of copper near the element being tested, decrease the copper soldered bit or line length with an X-acto knife and retest for...

Wwv Receiver

Get time amp frequency checks without buying multiband hf rcvr. Hear solar activity reports affecting radio propagation. Very sensitive and selective crystal controlled superhet, dedicated id listening ta WWV on 10 MHz. Performance rivals the most expensive rcvrs, RWWV Rcvr kit, PCB RWWV Rcvr kit with cabt, spkr, amp 12VtJc adapter 89 RWWV Rcvr w t in cabt with spkr amp adapter Rated for continuous duty, JjfejL JI, 2W continuous duty output. ttflEK Jftffcgb T301 Synthesized VHF ffi flf Jqf...

Lta

That's lighter-than-air dirigibles and cargo lifters. An article in Forbes on the CargoLifter company's huge hangar outside Berlin got my attention. I tried thirty years ago to get King Hussein interested in building lighter-than-air cargo lifters as a new industry for his country, but didn't get anywhere. Dirigibles were going great guns in the early 1930s, with the Hindenburg making regular Atlantic crossings. When it burned that stopped all dirigible interest. Of course, now we know that it...