Amateur radio accessory projects, software, schematics and kits.

Amateur Radio construction projects including QRP, homebrew and kits. Special event operating across the UK.

Indonesian amateur offers technical information, projects, manuals and links.

Homebrew amateur radio receivers, transmitters, transceivers and accessories. QRP related.

How to build big X-Yagis for VHF

homebrew transceivers, experiments, DSP

Radio modification and homebrewing information, schematics and manuals for commercial radio equipment and mobile phones.

Homebrew amateur radio site including tube and solid state transmitters and receivers.

Offers information about homemade audio amplifiers, RF amplifiers, auxiliary ham radio equipment including antenna designs and constructions.

The ingenious reflex circuits of Sir Douglas Hall as published in The Radio Constructor