Usually shortwave is not my favourite area of amateur radio. But inspired by an article from Eike-DM3ML i did some experiments
with WSPR (weak signal propagation reporting). It is a automatic beaconing network invented by K1JD. It is really exciting to see
low power stations appear at the display even with a really small receiver antenna. In addition i wrote some software for my
Atmel microcontroller that controlls a small DDS signal generator circuit. With this simple setup it is possible to transmit WSPR beacons
at 5dBm output power. Unfortunately 5dBm are not enougth to be heard by anyone with my small indoor antenna. Maybe i should
build an amplifier ;)

WSPR at 80m in JO61