![]() Message length after lossless compression: 28 bits for callsign, 15 for locator, 7 for power level => 50 bits total.Transmitted message: callsign + 4-character-locator + dBm Example: "K1JT FN20 30". ![]() Basic operating instructions for the initial release can be found in the file at WSPR_Instructions.TXT, and the program itself can be downloaded.īasic specifications of the MEPT_JT mode are as follows: The program scans a 200 Hz passband (the "QRSS window") looking for MEPT_JT signals, and decodes them. In receive mode the sound card digitizes audio from the transceiver. Like WSJT, WSPR uses a computer sound card to generate audio tones to modulate an SSB transceiver operating on upper sideband. It is executed from a Windows command prompt. It is functional for both transmitting and receiving, but it has no frills - no graphics, no GUI, etc. At present WSPR is a stand-alone executable, independent of WSJT.
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