Nostromo FSK QRSS beacon using discrete components

FSK modulation intended for QRSS' This can be controlled via a micro-controller or via audio using a transistor audio switch arrangement. Since qrss is very slow, a smart phone could provide the audio from a simple app or a recording set to repeat. An el-cheapo $1 mp3 player could also provide this functionality. Here the frequency shift has been set for far too much deviation. In reality we are looking for 3 - 10 Hz difference. both dits and dahs are higher frequency while, the spaces are lower frequency. 10 mW can reach intercontinental distances! I invite constructive criticism 73 Enjoy

published 7 years ago