A bareback LF/MF/HF/VHF WSPR transmitter for Raspberry Pi :
Makes a very simple WSPR beacon from your RasberryPi by connecting GPIO
port to Antenna (and LPF), operates on LF, MF, HF and VHF bands from
0 to 250 MHz.
WsprryPi Build Source:
Glenn Lyons VK4PK
Ver:gnl20200317 - pre published v0.9