WSPR (Whisper)

WSPR (pronounced "whisper") stands for "Weak Signal Propagation Reporter".

WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Transmissions carry a station's callsign, 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.
The WSPR protocol compresses the information in the message into 50 binary digits.

WSPR characteristics:

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