Weak Signal Propagation Reporter

WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Normal 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. To see a live version of the map pictured at top right, click here. (
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Some microprocessor based solutions:

Ultimate3/3S QRSS/WSPR kits by QRP Labs.

20M WSPR-Pi (QRPi)
See also this page.

Et en fran├žais WSPR-RX v1.


OE1GPA Homepage

About WSPR by G4ILO

WSPR 2.0 Software
WSPR 2.0 User's Guide
( en  de  fr  ru )