On 13/07/2017 17:10, Adrian Fabry wrote:
using here WSJT-X 1.8.0.rc1 r7843 on Windows XP /32 SP3
On the attached FT8 wav file is a weak tropo 6m signal. It decodes -21
dB but only when RX freq is placed on the signal (about 1012 Hz).
If I change the RX freq up or down for example to 1036 Hz I get no
decode anymore.
Is there anything that favors the RX freq when decoding? (beside being
the first decode in case of multiple signals )
On r7865 I built today, it can’t be decoded anymore regardless of the
RX freq.
No complain, the signal is really on the edge, I just wanted to share
this interesting case.
HI Ady,
Steve and Joe are fine tuning FT8, there are trade offs between speed
and depth. We have used the Rx frequency offset as a constraint to
enable a deeper search. That may not remain the case or may even become
a user option. As smarter decoding algorithms are tried the speed/depth
trade off must be reassessed for optimum performance.
73
Bill
G4WJS.
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