|SIM31 & SIM63
Ham Radio HF digital modes
SIM31 “Structured Integrated Message" is a new robust digimode specially designed for making reliable & confirmed QSOs under extreme conditions on all amateur bands.
It is interesting to note that even when a band appears to be closed, there is well chances for an open SIM31 path. and if you want to force the contact by your full permissible hight Tx-power or by the strenght of your magic directive antenna , Especially during weak propagation, SIM31 could be the
preferred mode to help you Dxing. Even weak received
signals, with additional local noises, that are -18dB S/N can be decoded with relative ease.
callsigns and S/N reports are
spotted automatically to the PSKReporter.info map service
and to the HamSpots.net/SIM web pages. So you
can see on world mape where are you well received and at what signal report.