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 can decode signals with S/N as low as −28 dB in a 2500 Hz bandwidth. Stations with internet access can automatically upload their reception reports to a central database called WSPRnet, which includes a mapping facility.
Applications for WSPR
Other applications include antenna testing, frequency stability and frequency accuracy checking.
Usually a WSPR station contains a computer and a transceiver, but it is also possible to build very simple beacon transmitters with little effort.
The Raspberry Pi can also be used as WSPR beacon.
Here’s another example DIY WSPR beacon project video:
Download WSPR Software at the Official WSPR Site: