Re: [wsjt-devel] JT4 incorrect SNR reports (introduced in wsjtx-2.1.0-rc5)

[Uwe, D. <dg...@gm...>]

Hi Dawid,

I will contact you off-list. I think I have found a solution. But it
still needs to be tested further.

73 de DG2YCB,
Uwe
________________________________________
German Amateur Radio Station DG2YCB
Dr. Uwe Risse
eMail: dg...@gm...
Info: www.qrz.com/db/DG2YCB


Am 27.03.2025 um 10:01 schrieb Dawid SQ6EMM via wsjt-devel:
> Some small update.
>
> "Bug" (from my perspective) was not introduced in wsjtx-2.1.0-rc5, but
> AFTER wsjtx-2.1.0-rc5 binary release.
>
> Test described in the previous email was done in docker containers
> with specified versions installed inside.
>
> <Dockerfile>
> from ubuntu:18.04
> ADD files /tmp
> ADD JT4 /JT4
> RUN apt -y update && apt -y dist-upgrade && apt -y install
> /tmp/wsjtx_2.1.0-rc7_amd64.deb
> </Dockerfile>
>
> Yesterday evening I have built latest version of wsjtx from git and I
> reverted the commit 2044b736dad8444272d3dd5f89cf63716ccbf073.
> It did not help - so it seems it's more complicated than only this
> commit, but this is where my knowledge of Fortran ends;)
>
>
>
> śr., 26 mar 2025 o 22:39 Dawid SQ6EMM <sq...@ha...> napisał(a):
>
>     Hey, for some time I have been playing a lot with JT4(g).
>     During those exercises it was identified that JT4(g) - I was only
>     playing with G is incorrectly reporting the SNR (meaning values
>     are never stronger than -13dB and there is no even indirect
>     connection between signal strength and JT4g report).
>
>     I described that a little bit broader on wsjt users group here:
>
>     https://wsjtx.groups.io/g/main/topic/111843701
>
>     But just to reach dev community and ask for fix I think its better
>     here...
>
>     So simple exercise (test files for JT4 - Charles G3WDG) and two
>     versions of wsjt:
>
>     for i in *.wav; do echo $i; jt9 -4 -d 3 -b G -f 1000 $i ; done
>
>     wsjtx-2.1.0-rc5:
>     000000_0002.wav
>     0002  -5 -0.1 1006 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0004.wav
>     0004  -7 -0.1 1002 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0006.wav
>     0006  -9 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0008.wav
>     0008 -11 -0.1 1004 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0010.wav
>     0010 -13 -0.1  995 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0012.wav
>     0012 -15 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0014.wav
>     0014 -17 -0.1 1004 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0016.wav
>     0016 -20 -0.1  998 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0018.wav
>     0018 -22 -0.0  995 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0020.wav
>     0020 -24 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0022.wav
>     0022 -26 -0.0 1000 $*
>     <DecodeFinished>   0   1
>
>     wsjtx-2.1.0-rc7:
>     000000_0002.wav
>     0002 -15 -0.1 1006 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0004.wav
>     0004 -15 -0.1 1002 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0006.wav
>     0006 -15 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0008.wav
>     0008 -15 -0.1 1004 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0010.wav
>     0010 -14 -0.1  995 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0012.wav
>     0012 -15 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0014.wav
>     0014 -15 -0.1 1004 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0016.wav
>     0016 -16 -0.1  998 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0018.wav
>     0018 -18 -0.0  995 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0020.wav
>     0020 -17 -0.1 1000 $* CQ DL0SHF JO54         f
>     <DecodeFinished>   0   1
>     000000_0022.wav
>     0022 -18 -0.0 1000 $*
>     <DecodeFinished>   0   1
>
>
>     and additionally I guess the commit that was about to fix it - I
>     guess might be a reason why its not working correctly now:
>
>
>     commit 2044b736dad8444272d3dd5f89cf63716ccbf073
>     Author: Joe Taylor <joe@...>
>     Date:   Mon May 20 12:46:36 2019 -0400
>
>         Fix a bug in calculation of S/N in JT4 mode.
>
>
>     Thanks for your help in advance.
>
>     --
>     Dawid
>
>
>
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