What I am not sure about, Markus...
In your software do you actually decode the data in some way, therefore
using knowledge of the Opera signal coding OR....
Do you precode a callsign (your "precalculated templates from a limited
list of callsigns") then correlate the received data against the pattern
generated for that callsign. If this latter is the case, then
really you are decoding just one bit of infomration. The presence or
absence of a known call.
I suspect many readers hoping for an independent Opera are thinking the
first option; but your description makes me think its the latter. In which
case, its certainly not a generalised data communication protocol, but a
weak signal error corrected path checker.
Andy
G4JNT
Den 22.02.2013 11:55, skrev Markus:
Steinar,
yes this is an independent development. It's still very experimental, but I intend to make it public after I have fixed a few more issues.
The functional difference is that I don't try to decode individual bits, but correlate the message as a whole against precalculated templates from a limited list of callsigns. The benefit is that these detections can be up to 10 to 12 dB more sensitive than the incoherent decoding in the original software.
Best 73,
Markus