|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
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.