circuits diagrams

F5DQK Vinecon 6N4 - A dual band antenna for 50Mhz and 70Mhz with lots of pictures and diagrams by F5DQK

Simple HF Baluns for 50/75 ohm coax - Show diagrams, winding methods and tables of some 1:1 and 4:1 baluns for 1.8 - 30 MHz suitable for use up to 200W (400W peak) on systems using 50 or 75 ohm coaxial cable input where SWR should not exceed 1.6:1.

Antentop: Loop Antennas - Article on radiation patterns of small loops, equivalent circuits of loop antenna, small loops as receiving antennas, ferrite loops

Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.

A Portable Antenna Matching Unit - A small HF antenna tuner project for qrp operations. Includes circuit diagrams pictures and test results by GW4ALG

NM-ARTS - Amateur Radio Technical Society - A hardware and software project group to support learning and creation radio circuits, general electronics, and uProcessor control systems

PSK31 Interfacing - PSK31 basics and radio to pc soundcard interface circuits, radio to soundcard, soundcard to radio and pc serial port to radio

Is HF propagation reciprocal - Some test circuits using the ACE-HF System Simulation & Visualization software, about reciprocal propagation on HF bands by NW7US

The Yaesu FT-817 Transceiver - FT-817 manuals and schematics and diagrams

Yaesu FT-847 (FT 847 FT847) at ham.dzm.ro - Yaesu FT-847 (FT 847 FT847) transceivers mods reviews software manuals and diagrams

M.C. Howard Electronics - Distributor of Common Electronic Components Such As Memory, Integrated Circuits, Discrete Components, Cables And Services. We Also Provide Prom Programming, Simm Manufacturing, Testing And Custom Kitting.

DERF electronics corporation - Distributor of electronic components like diodes Transistors Microcontrollers Microprocessors connectors, switches, relays, integrated circuits, eproms, leds

Far Circuits - FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

AP Circuits - Printed circuit board fabrication

Homebrew HF Amp with 3CX3000F7 - Grounded grid triode HF linear amplifier with pictures and schematics diagrams by W2DTC. The amp design was for 160 80 40 and 20 meters

Medium Frequency Amplifier Circuits Compared - Mark Connelly, WA1ION article on Medium Frequency Amplifier Circuits in PDF format, include some RF amplifier schematics

Build a Remote Control Antenna Switch - Remote Control Antenna Switch made with two circuits board

NiCad battery charger - A basic nicad battery charger using a single medium power transistor.

Lightning Protection : Protecting each I/O line - KB22UT Article on how protecting ham radio station and in particular I/O Lines such as AC power, coax cable, control circuits, telephone line.

20 Amp power supply - A 13.8 volt 20 Ampere power supply project

Designing Op Amp Audio PreAmplifiers - Design guidelines for Op Amp audio preamplifier circuits by Mike Martell N1HFX

How to solder - Key facts about how to solder, how to solder wire, how to solder pcb's, and including general soldering techniques and the best ways of making good solder joints for electronic circuits and construction. Includes video

Sound Card interface - Interface to insulate the radio circuits from the computer by VK2GWK

Simple Spectrum Analyser - Homebrew a simple spectrum analyzer. Diagrams, part list and instructions by G4AON

Fun With Tubes - Dedicated to passing on and preserving knowledge of vacuum tube circuits and techniques