WSPR: Weak Signal Propagation Path Reporting

WSPR (pronounced “whisper”) stands for “Weak Signal Propagation Reporter”. It is a protocol, implemented in a computer program, used for weak-signal radio communication between amateur radio operators. WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Transmissions carry a station’s callsign, Maidenhead grid locator, and transmitter power in dBm. The program […]

Minima Transceiver Schematics & Code

For those who want to build their own superheterodyne transceiver, the Minima may fit the bill. Designed by Ashhar Farhan, the schematics are freely available online. Minima Schematics: Backup Archive of Schematics: Minima Arduino code on Github: Discussion of Minima on FreeList:,24 PCB for Minima builds: