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

[Ramiro Aceves <ea1abz%gmail.com@localhost>]

Hello, I have FT8 radio signals decodes using the internal sound card.

Thees are my cards:

netbsd-nuc# audiocfg list
0: [ ] audio2 @ uaudio0: USB audio
       playback: unavailable
       record:   2ch, 32000Hz
       (-R) slinear_le 16/16, 2ch, { 16000 }
       (-R) slinear_le 16/16, 2ch, { 24000 }
       (-R) slinear_le 16/16, 2ch, { 32000 }
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
2: [ ] audio0 @ hdafg0: Realtek product 0235
       playback: 2ch, 48000Hz
       record:   2ch, 48000Hz
       (PR) slinear_le 16/16, 2ch, { 44100, 48000, 96000, 192000 }
       (PR) slinear_le 20/32, 2ch, { 44100, 48000, 96000, 192000 }
       (PR) slinear_le 24/32, 2ch, { 44100, 48000, 96000, 192000 }
       (  ) ac3 16/16, 2ch, { 44100, 48000, 96000, 192000 }
3: [ ] audio1 @ hdafg1: Intel HDMI/DP
       playback: 2ch, 48000Hz
       record:   2ch, 48000Hz
       (P-) slinear_le 16/16, 2ch, { 48000 }
       (P-) slinear_le 16/16, 4ch, { 48000 }
       (P-) slinear_le 16/16, 6ch, { 48000 }
       (P-) slinear_le 16/16, 8ch, { 48000 }
       (PR) slinear_le 16/16, 2ch, 48000-48000Hz
netbsd-nuc#

Setting card number 2  (Realtek at /dev/audio0) in WSJTX 
File->Settings->Audio:

Input: oss_input.audio0

It decodes radio FT8 signals just fine!:



0014 WSJT-X
154800 -21  0.2 2105 ~  UA1AOF IZ5NSH RR73
154830 -12  0.2 1714 ~  CQ F5PIO JN19
154845  -4  0.5 1976 ~  CQ SM0SYP JO89
154845 -12  0.2 1513 ~  CQ F5SJF JN08
154845 -15  1.0 2190 ~  IR0WWA SQ2PK JO94
154845 -16  0.1 2458 ~  CQ PA1GUZ JO22
154845 -18  0.2 2220 ~  <...> S59OP/QRP 73
154900 -10  0.2 1764 ~  SV2ROC LA3BO -07
154900 -18  0.1 1715 ~  CQ F5PIO JN19
154900 -16  0.1 2609 ~  SM0SYP SV1BLD KM17
154900 -17  0.1  733 ~  US8UW GJ0KYZ +10
154900 -17  0.2 1526 ~  OH6WX DA0WWA RR73
154915 -10  0.5 1977 ~  YT1TY SM0SYP R+08
154915 -11  0.2 1513 ~  CQ F5SJF JN08
154915 -13  0.5 2437 ~  OH9DVN G5NGL R-17
154915 -17  0.2 2501 ~  N2CR IZ3KVD JN65

It appears to be a sample rate mismatch when using the Maudio 
FastTrackPro USB card (/dev/audio3)

I have tuned a radio signal of exactly 440 Hz audio tone, but it is 
printed at about 476 kHz on the waterfall using the FasTrackPro. That is 
the exact relationship between a 48000 and 44100 Hz audio.

On the other hand, using the internal Realtek audio card, 440 Hz audio 
is printed exactly at 440 Hz on the waterfall.

Now the history is how can I tell the FastTrackPro to use the right 
sample rate (48000).

I have no luck using audioctl interface, or I do not understand it.

netbsd-nuc# audioctl -d /dev/audio3 -a |grep rate
play.rate=8000
record.rate=8000
netbsd-nuc# audioctl -d /dev/audio0 -a |grep rate
play.rate=8000
record.rate=8000
netbsd-nuc#

Why they are 8 kHz?


netbsd-nuc# audioctl -d /dev/audio3 -w record.rate=48000
record.rate: -> 48000

netbsd-nuc# audioctl -d /dev/audio3 -a |grep rate
play.rate=8000
record.rate=8000
netbsd-nuc#

It returns to 8 kHz.

I do not unterstand it.

Thanks.
Regards.

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