Amateur Radio
682 sites
http://radiowrench.com/sonic/index.html
A long-running free resource archive started in 1997 offering downloadable manuals, service documents, and technical diagrams for VHF/UHF radios, repeaters, antennas, and related RF equipment. The site hosts PDFs covering everything from GE MVP repeater manuals to tone decoder boards and duplexer specs, making it a valuable reference for amateur radio operators and radio technicians.
https://www.qsl.net/k6eag
The Hayward Radio Club (K6EAG) is a non-profit amateur radio club serving the San Francisco Bay Area's East Bay community, offering member meetings, emergency preparedness drills, licensing upgrade classes, and access to 2M, 6M, and 70CM repeaters. Incorporated in California as an educational foundation, it provides a hub for ham radio enthusiasts in the Hayward region.