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Low power VHF RF amplifier with VMP1 Mosfet by IZ1BTS IK1XPD

A compact multiband wire antenna suitable for portable operations.

A home made vertical polarized moxon antenna for 144 MHz, includes dimensions, antenna pattern, SWR and antenna gain plots by WB5CXC

If you want to interface the IC-746 Pro or any other Icom rig with a computer for rig control, an outboard CI-V CAT device is required.

Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA

DG6RBP homebrew project for a USB cable progtamming interface for the Yaesu VX-2 radio

This application note is designed to help the reader understand how balun transformers can be used in today's RF/Microwave communication applications.

JIM, N0UQZ TS-2000 review

A complete review of Icom IC-706 review published in 1999 by QST

Schematic for Yaesu FT-857 CAT interface

BIRD RF power measuring, new and used, HENRY RF power amplifiers (used HF amps), TOHTSU coaxial relays, SAMLEX power supplies, RFI chokes reduce interference, Parts parts, tubes, Used amplifiers, radios, antennas and accessories, Los Angeles, CA.

Amplifier keying buffer for ICOM radios & others. Suitable for IC-746 IC-756 PRO and PROII. ACC1 key interface by KK5DR

SDR Forum - organization dedicated to promoting the development, deployment and use of software defined radio technologies for advanced wireless systems.

This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands. This is a 6-band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands. Stop band reject may be limited by the relay isolation. Worse case isolation is at 28 MHz or 35 dB or better. Relay K3/K8 protects the filter during transmit via the PTT line. A 25-50ms delay must be used between transmit and PTT. Do not rely on your radio to provide adequate delay with out using the PTT. You logging software must be set to allow a delay between PTT and time of 1st transmit. This filter will not work with VOX or QSK keying as you will damage the filter.

The page discusses Axial-Mode Helical Antennas, focusing on turning helical antennas over perfect ground and modeling helices in NEC-2 for optimized design. It covers topics such as high-gain performance, broadband, impedance matching, radiation pattern, feedline, balun, near field, far field, and DIY applications.

interface box for Icom rigs that includes a band output port and a CI-V­to­computer serial interface

Russian callsign prefix series: RAA-RZZ, UAA-UIZ, includs Amateur callsign system in Russia

Ham Radio Magazine of DARC

A MRF141G 3-175MHz Broadband Power Amplifier DL4MEA 02/1998

Versatile transmit interface circuit

Radio Free Asia (RFA) is a private, non-profit corporation broadcasting news and information in 9 languages to listeners in Asia

External Amplifier Keying from the IC-706 by Bob Wolbert, K6XX

A simple RF Generator project by YO5HHP

A Simple Serial and Sound-Card Interface for the Yaesu FT-857D

This is a 24 MOSFET Class E RF Amplifier, covering the 80 and 160 meter amateur radio bands.

Whether we are tuning up homebrew equipment, checking antenna VSWR, adjusting a linear amplifier, or just monitoring output power during a contest, almost all aspects of ham operation can use a power meter. Paul Wade W1GHZ

The Kenwood TS-950S and TS-950SD HF transceivers are fine radios. However, many, if not all, of them were produced with a design flaw which allows the RG GAIN control to cease function in the presence of a strong signal IF the AGC has been turned OFF

Thierry LOMBRY, ON4SKY, develops in several technical articles the way to select a transceiver. His website includes also some in-depth reviews

Popular, versatile and easy to use Morse code training software written with the latest PC software technologies, and it is free with support. Guaranteed to increase your speed!

Description of the 80m antenna used at CN2WW in the ARRL-DX CW 2007

RADIOING eEngineer RFI EMI information

Schematics of antenna couplers in french

A simple RF power amplifier initially designed for 40 meter band can work on 10 15 20 40 80 meters

Universal radio IC-V8000 page includes accessories and photos

High Power RF Amplifiers by Delta Sigma, Inc

A home made sweeping signal generator up to 2 GHz

An engineering oriented organization specializing in the design and manufacture of high performance parabolic antennas, 3dB high power RF couplers, Antenna power splitters, directional RF couplers and more items for RF transmission from HF through Microwave frequencies.

The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply by ON6MU

C Band Transverter for 5668 - 434MHz

Grahams Goldcoast Australia Radio Scanner Frequencies

HF power amplifier project powered by GU-78B by SV8JE

The document is a technical guide on designing RF filters for radio frequency applications. It covers topics such as interference suppression, band-pass filters, and low pass filters, with a focus on filter design and circuit filters.

Minimal interface circuits for receiver and transmitter audio, also for PSK31

PTT and soundcard interface schematic by ON6MU

Make your own interface, two schematics for building an interface using the RTS line by N3UR

If your doing any home brewing gear for ham radio its a great idea to have a dummy load. This will to your radio be the perfect antenna...it will never radiate but your radio sees a perfect 50 Ohm impedance.

IC820H or other Icom Radios Soundcard interface for VHF EME use by DF9CY

Drawing and plan for an HF magnetic loop antenna

A simple RF oscillator by Harry Lythall - SM0VPO

Need to interface both a TNC and the computer soundcard? This is a ICOM 756PRO ACC1 audio/keying/FSK interface by WA0SXV