HEATKEYS

Specialized VHF and UHF FM two way radio equipment for amateur and commercial radio applications.

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

The Repeater Builders Technical Information Page - a library of hands-on reference material for the repeater builder, be he (or she) amateur radio, commercial radio, LMR, public safety, CAP, GMRS, or ???

Texas Instruments (TI) is a global analog and digital semiconductor IC design and manufacturing company.

This is a discussion forum for amateur radio operators

Free Electronic projects, schematics, diagramms, pcb, free electronic software and hobbilist electronics resources, electronic community and much more

Alcatel-Lucent is a global communications industry leader with the innovation, expertise and vision for a connected world that moves at the speed of ideas.

IEEE Xplore. Delivering full text access to the world