This is a small prototype of future TRX for 2 meters band, the goal is to make a very simple construction for mobile usage, Based on DRA818 chinese module, he use Arduino with a rotative encoder some small buttons.
Some details:
– Coverage from 144 to 146 (possible extend from 134 to 174).
– Mode VFO or Repeater (shift -600k) with 1750Hz carrier.
– Function: Scan (not implemented yet), Memory, Step (5/10/12.5/25/100k), Wide/Narrow 12.5/25Khz, Power output 5/20W (with old TRW20 PA module).
Continuer la lecture de DRA818 Transceiver with Arduino →
Small prototype of combination between trackuino and DRA818V,
Overview
« Trackuino is intended for use by licensed radio amateurs. By operating on the standard APRS frequency, the signal can be picked up by an Internet gateway and reported on aprs.fi, so anyone with an Internet connection can track the tracker »
The idea of this project was to build a trackuino board with small gps module, low power arduino pro mini (3.3v @8mhz), a VHF transceiver DRA818V, and power management integrated. 
Continuer la lecture de APRS tracker with DRA818V →
HamRadio & electronic's stuff