cell phones

Build Yagi antennas that works - Excellent article on How to Build A Yagi Antenna That Works by Paul NO8D DX Engineering

W2ENY - Radio Accessories - Handcrafted Accessories for the shack by W2ENY includes Full range headphones with a mic, computer interfaces, mic ptt adapters

ARC electronics - Communications solutions for Business, Utility and Industrial applications including data phones wireless RF

300 W Amplifier for 33 cm band - This amplifier takes advantage of the proliferation of surplus cellular 26v RF boards

Yaesu DSP Settings and Pin Connections - Yaesu DSP audio settings for Heil Sound headphones

12 v gel cell charger - Schematic of a fast charger for Gel Cell batteries

AVR Butterfly Keyer - The Atmel AVR Butterfly is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.

Icom DSP Settings and Pin Connections - ICOM audio DSP settings and pin connections for heil sound headphones

Kenwood DSP Settings and pin connections - Kenwood radios audio DSP settings for Heil Sound headphones

Noise cancellation on 2m using 2 antennas  ^updated - Article on Phase-cancellation of noise on 2m band