In
Earth->Moon->Earth (EME) communication the signal echoed back are so weak
that only very efficient and simple modulation techniques can be used. The
traditional and classical system used by radio amateurs is telegraphy (CW)
where the basic information encoding allows detecting and decoding very weak
echoes. With
the use of computers a new digital system where all the encoding and decoding of
information is done by software has recently became popular in the EME
community. Phone transmissions are
also used but they requires higher signal levels and therefore are only
possible between well equipped
stations.
SSB QSO with PA8A,27th/Dec/2014 (Video recorded by SP7DCS)
F6ETI/P in QSO with I1NDP with his portable setup,23th/Oct/2016