Joe, I just noticed that the snr that the modified jt65 reports for the -24db files is now about -21 db. I think that it's because the program derives its snr estimate from the pilot-tone and not from the symbols. We expect a 3db improvement in going from half-symbol to full-symbol coherent integration for the pilot-tone analysis. This should produce something like a 1/sqrt(2) reduction in the rms uncertainty of our f0 and dt estimates - and that’s about what I saw. Of course, the snr associated with the symbols has not changed…
Steve k9an > On Oct 31, 2015, at 5:40 PM, Steven Franke <s.j.fra...@icloud.com> wrote: > > Joe - > I should add that I manually change the configuration of the jt65 program > between the -24db test and the hf test as follows: > > for -24dB data (eme-like) conditions: > in jt65a_exp.f90: > I used only one decoding pass and nsubtract=0 > in jt65.f90: > ntrials=10000 > nfa=1250 > nfb=1290 > > for hf data: > in jt65a_exp.f90 > 2 decoding passes and nsubtract=1 only on the first pass > in jt65.f90: > ntrials=1000 > nfa=200 > nfb=3000 > > If you try to run the -24dB data using the hf settings, it becomes > intolerably slow. > Steve k9an > > >> On Oct 31, 2015, at 3:47 PM, Steven Franke <s.j.fra...@icloud.com> wrote: >> >> Joe - >> For reference, here is the bash script that I used to convert my JTSim files >> to 16-bits at 12kS/s. You’d have to change the directory name, of course. >> Steve >> >> #!/bin/bash >> for i in $( cd ../JT65-24db; ls A*.WAV); do >> echo $i; >> sox --ignore-length ../JT65-24db/$i -r 12000 -b 16 ./$i; >> done >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> wsjt-devel mailing list >> wsjt-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/wsjt-devel > > > ------------------------------------------------------------------------------ > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
