[solved]Re: wip/wsjtx does not decode FT8 radio signals.

●To: PkgSrc Users Discussion List <pkgsrc-users%netbsd.org@localhost> ●Subject: [solved]Re: wip/wsjtx does not decode FT8 radio signals. ●From: Ramiro Aceves <ea1abz%gmail.com@localhost> ●Date: Tue, 6 Jan 2026 22:34:43 +0100



El 6/1/26 a las 18:10, Michael van Elst escribió:

ea1abz%gmail.com@localhost (Ramiro Aceves) writes:

I will continue investigating. Now the sample rate seems to be ok but
there will be a reason for no decodes. Perhaps the card samples at 44100
Hz but NetBSD resamples it to 48000 and "destroys" it in some way?
It does not occur with the internal card because perhaps it works fine
at 480000 and no resamping is needed?



The settings of /dev/audioN (or /dev/soundN) are those of a "virtual"
device.

The output of 'audiocfg list' shows the possible settings of the
hardware instead. The data is converted on the fly from and to
the "virtual" settings.

With 'audioconfig set' you can change the hardware settings
(within the limits of what the hardware driver supports).

If hardware and "virtual" device have the same settings, there
is no conversion done.

N.B. when resampling takes place, the conversion has a rather
low quality, in particular when the signal hasn't passed a
reasonable filter. But I don't know how much that affects
your decoder.


Thanks Michael for your great explanation!

I have it working now this way, configuring the card for recording at a sample rate of 44100 Hz using audiocfg:




netbsd-nuc# audiocfg list 1
1: [*] audio3 @ uaudio1: USB audio
       playback: 2ch, 44100Hz
       record:   2ch, 48000Hz
       (P-) slinear_le 16/16, 2ch, { 44100 }
       (P-) slinear_le 16/16, 2ch, { 44100 }
       (-R) slinear_le 16/16, 2ch, 8000-48000Hz

netbsd-nuc# audiocfg set 1 r slinear_le 16 2 44100
setting audio3 to slinear_le:16, 2ch, 44100Hz

netbsd-nuc# audiocfg list 1
1: [*] audio3 @ uaudio1: USB audio
       playback: 2ch, 44100Hz
       record:   2ch, 44100Hz
       (P-) slinear_le 16/16, 2ch, { 44100 }
       (P-) slinear_le 16/16, 2ch, { 44100 }
       (-R) slinear_le 16/16, 2ch, 8000-48000Hz
netbsd-nuc#

Now it decodes amateur radio FT8 signals perfectly:


0014 WSJT-X
212415  -3  1.1 1178 ~  LU3DW II2WWA RR73
212415   2  0.8  340 ~  HC5CG IK4LZH JN54
212415 -13  0.2 1506 ~  II7WWA F4JYC 73
212415 -12  0.7 2353 ~  KV8S IQ4JO JN63
212415 -13  0.8  852 ~  <...> PY1KV/QRP
212415 -19  0.8  914 ~  KO4MEX F4LQD JN07
212415 -17 -0.8 2353 ~  W4I IU5KZG JN53
212415 -15  0.8 1564 ~  K6RO 9A6R R-04
212430  -5  0.4  853 ~  <PY1KV/QRP> DL8GAP -12
212430  -2  0.7 2140 ~  EA1ZT RR73; IU5VKD <...> -18
212430   1  0.7 1962 ~  CQ EA8DHQ IL18
212430   0  0.7 1365 ~  KC2ZZR 9A9A +02
212430 -16  2.1 1645 ~  9A6R DJ7YP JO42
212430 -14  1.7 1503 ~  IU8ODA F5OYA/P JN13
212430 -10  2.0 1458 ~  II2WWA LU3DW 73
212430 -16  0.8  722 ~  PY4STO DH1JG JO31
212430 -12  0.7  502 ~  II2WWA PD0R R-19
212430 -18  0.7 2069 ~  9A6R K6RO -17
212430 -17  0.8 1555 ~  IU8ODA NP4TX -08
212430 -22  0.7  930 ~  CE2SV ON8EM JO10
212430  -3  0.7 1934 ~  F4JYC F5RRS JN36
212430 -15  0.3 1996 ~  CQ OR7K JO21
212430 -10  0.6 1382 ~  CQ NA PD8DX JO32
212445   3  0.7  340 ~  HC5CG IK4LZH R-05
212445 -15  0.6  914 ~  KO4MEX F4LQD JN07
212445 -13  0.6  853 ~  DL8GAP <PY1KV/QRP> R-08
212445  -6  0.9 1178 ~  PD0R II2WWA RR73
212445 -14  0.7 1114 ~  CQ V31DL EK57
212445 -12  0.1 1506 ~  F5RRS F4JYC -04
212445 -17  0.8 2098 ~  9A9A LU2VPG -24
212445 -17  0.6 1565 ~  K6RO 9A6R RR73
212445 -15  0.6 1164 ~  CQ PY2AMP GG66
212500   0  0.9 2140 ~  IU5VKD ZW5B RR73
212500  -5  0.3  853 ~  <PY1KV/QRP> DL8GAP RR73
212500  -5  0.5 1934 ~  F4JYC F5RRS R-10
212500   0  0.6 1248 ~  CE2SV DL5AA +12
212500 -11  0.2 1996 ~  CQ OR7K JO21
212500 -10  0.6  502 ~  II2WWA PD0R R-19
212500  -9  0.6 2352 ~  N3WXW IQ4JO JN63
212500  -4  0.5 1365 ~  KC2ZZR 9A9A RR73
212500  -7  0.6 1415 ~  II2WWA PY1AX GG87
212500 -13  1.5 1503 ~  IU8ODA F5OYA/P JN13
212500 -16  0.6 2069 ~  9A6R K6RO 73
212500 -20  0.6  722 ~  PY4STO DH1JG JO31
212500 -17  0.6 1555 ~  VE4BDR NP4TX -18
212500 -16  1.5 1645 ~  9A6R DJ7YP JO42
212500 -10  0.5 1383 ~  CQ NA PD8DX JO32
212500 -20  0.7 2063 ~  CE2SV G6PWS IO91
212500 -23  0.6  930 ~  CE2SV ON8EM JO10
212515  -3  0.8 1178 ~  PY1AX II2WWA -05
212515 -11  0.5  853 ~  <DL8GAP> PY1KV/QRP 73
212515  -4  0.4  286 ~  KA1BJX ON6JL RR73
212515 -15  0.5  913 ~  KO4MEX F4LQD JN07
212515 -14  0.5 1651 ~  KO4MEX IW3BYL JN56
212515 -11 -0.1 1505 ~  F5RRS F4JYC RR73
212515 -12  0.6 1114 ~  N8ADK V31DL -09
212515  -9  0.6  341 ~  HC5CG IK4LZH 73
212515 -18  0.5 1756 ~  YN1Y DG1CMZ JO60
212515 -14  0.7 1162 ~  CQ PY2AMP GG66
212515 -19  0.6 2099 ~  9A9A LU2VPG -24
212530   0  1.8 2141 ~  VA3BRC ZW5B -13
212530  -1  0.4 1248 ~  CE2SV DL5AA RR73
212530  -7  0.1  853 ~  <PY1KV/QRP> DL8GAP 73
212530 -13  1.3 1503 ~  IU8ODA F5OYA/P JN13
212530 -13  0.4  502 ~  II2WWA PD0R R-19
212530   0  0.4 1962 ~  CQ EA8DHQ IL18
212530 -17  0.3  681 ~  CE2SV IZ1DRY JN35
212530  -5  0.4 1365 ~  LU2VPG 9A9A R-08
212530 -18  0.4  722 ~  PY4STO DH1JG JO31
212530 -19  0.4 2070 ~  CQ K6RO FN43
212530   0  0.3 1935 ~  F4JYC F5RRS 73
212530 -13 -0.1 1996 ~  CQ OR7K JO21
212530  -6  0.4 1415 ~  II2WWA PY1AX R-10
212530  -7  0.2 1383 ~  CQ NA PD8DX JO32

Now a 440 Hz audio signal injected from the signal generator prints on the waterfall a solid and narrow vertical line as it corresponds to a sine wave, and it is placed exactly at 440 Hz.


Thanks so much.

Regards.
Ramiro.

●Follow-Ups: ●PKG_OPTIONS.fftw+= fftw-fortran (Re: [solved] Re: wip/wsjtx does not decode FT8 radio signals. ●From: Makoto Fujiwara ●Re: [solved]Re: wip/wsjtx does not decode FT8 radio signals. ●From: Ramiro Aceves ●References: ●Re: [partially solved]Re: wip/wsjtx does not decode FT8 radio signals. ●From: Brian Buhrow ●Re: [partially solved]Re: wip/wsjtx does not decode FT8 radio signals. ●From: Ramiro Aceves ●Re: [partially solved]Re: wip/wsjtx does not decode FT8 radio signals. ●From: Michael van Elst

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