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

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

El 6/1/26 a las 17:28, Brian Buhrow escribió:
> 	hello.  /dev/audio resets the device parameters back to the defaults when a process closes
> it.  /dev/sound holds the parameters between opens and closes of different processes.  So, if
> you  use /dev/sound3 instead of /dev/audio3, your audioctl commands will still be in effect
> when you read your incoming audio data.
>
> Hope that helps.
> -Brian

Thanks so much, Brian. I am going to investigate that. WSJTX does not 
offer to me "/dev/sound" devices, only "/dev/audio"

I do not why but now the 440 Hz tone prints right on the waterfall 440 
Hz. But no FT8 decodes.

I am feeding the receiver with a signal generator now.
It appears to be a noisy strange signal instead of a steady and unique 
straight vertical line that should correspond to a sine wave.

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?

"man audio" page says:
...
...

 The frequency conversion adapts the simplest way (interpolation method 
for upward, and simple thinning method for downward) due to restriction 
in kernel resources and processing time. It will work well in most case 
but don't expect excessive quality.
...

ummm, I do not know if it could affect this delicate digital radio modes.

Anyway, many tests today and I think I am becoming a bit crazy.
Tomorrow I will test feeding the sound card directly with an audio tone 
instead of an RF tone into the receiver and see if I can confirm signal 
degradation.


Regards.