40m transmitter circuit

A turnstile antenna for 2-meter ARDF - Antenna design for use with hidden transmitters on international-rules ARDF events

PA0NHC 80/40mtrs dipole antenna - Dipole antenna for 80 to 20 mtrs with END-coax feed by PA0NHC

Feeding the Beast - Transferring Radio Frequency Energy from Your Transmitter to Your Antenna by Don Keith N4KC

Wireman-J-Poles for 2m-40m  ^{updated  pop} - J-Poles with Wireman-cables for the quarterwave matching section

Transmitter Power, Antenna Gain, Coax Loss - Understanding relatio among transmitter power, antenna gain, and coax loss Trade-offs by Ken Larson KJ6RZ

Contest audio file - MP3 file recording a QSOs with SP5CKA and SN7N (SP7PS) in SP DX Contest 2001 on 40m (recorded by SP7PS)

Ramsey Electronics - Large selection of affordable and fun hobby kits as well as a really neat selection of electronic gear. Transmitters and receivers kits, test equipments, RF test enclosures.

Telewave - Telewave's innovative engineering produces the industry's toughest antenna systems. Yagi, Fiberglass Collinear, and Dipole models are available from 66-2500 MHz. Wattmeters, test equipment,rf power meters, duplexers, filters and cavities, transmitters combiners

Omnicor - Vacuum Capacitors - Omnicor supplies Meivac vacuum fixed and variable vacuum capacitors for RF transmitters.

Antenna Noise and Signal Cancelling at LF - The fact that the phasing between a wanted signal and an unwanted signal can be different on different antennas is put to advantage. With this condition, the unwanted signal can be cancelled out by controlling amplitude and phase. The heart of the system is some form of phase control circuitry.

Thunt.org : transmitter hunting - Amateur radio direction finding, transmitter hunting web site from San Francisco. Triangulating a radio signal direction and plotting its bearing on a map. Hunters use doppler systems for tracking hidden transmitters anywhere in the san francisco bay area, fremont california

Far circuits - Direction finding projects, useful tools for t-hunting operations

Hidden transmitter hunting - Interesting t-hunting projects, from antennas to audible smeters

Kq6xa ROCA radio orienteering in a compact area - ROCA Radio Orienteering in a Compact Area, ARDF Foxhunting. T-Hunting. The New Walking Foxhunt "ROCA". Rules and Event Organizational Information. Experimental and Competition Events. Equipment. Links. RDF Radio Direction Finding Systems. Mobile Transmitter Hunting.

ON7YD ARDF pages - Includes some interesting projects for low power ARDF transmitters

A low power 3.5MHz ARDF transmitter - This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

HRX80 80 meters receivers for APRS - 80-meter peilontvanger / receiver includes printed circuit sample and list of components

Piedmont transmitter tracking - T-Hunting club in north carolina

Mods Kenwood TS-2000 DSP by N3GX - Mods, kenwood ts-2000 4 khz ssb transmitter receiver modification

Qsk keying for yaesu radios - QSK amplifier keying circuit for Yaesu FT-1000MP, FT-1000MP Mk-V, FT-1000/1000D and FT-920

FM transmitter kit for 88-108 Mhz - 3 Watt fm Transmitter Hobby Kit 88 - 108 Mhz. Kit Includes Glass Fibre Printed Circuit Broad High Quality Componets Full Instructions

RF Coaxial Connectors - RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface.

Bowden's Hobby Circuits - A small collection of electronic circuits for the hobbyist or student. Site includes over 100 circuit diagrams, links to related sites, commercial kits and projects, newsgroups and educational areas. Most of the circuits can be built with common components available from Radio Shack or salvaged from scrap electronic equipment

Tone Keyer For Morse Code Programs - Key your transmitter from the tone output of a Morse Code generator program

A 80/40m Direct Conversion HF Receiver with DDS VFO - Juha (OH2NLT) and Matti (OH7SV) have designed JUMA-RX1, an award winning 80/40m direct conversion HF receiver with highly accurate direct digital synthesis VFO. The receiver is very compact, because it constructed using surface mount components. No coils need to be wound to construct this receiver!