Reviewing the WSPRlite transmitter by SOTABeams. Includes a description, demonstration and a look inside. In conjunction with the DXplorer website it forms a system useful for testing propagation and antennas.
SOTABeams: http://www.sotabeams.co.uk/
DXplorer: http://dxplorer.net/
WSPR website: http://dev.wsprnet.org/drupal/
Time calibration: https://time.is/
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