[Kenwood] PSK31 and sound card sampling rate.

Thu, 4 Apr 2002 18:26:23 -0500

No what I meant is that the WINPSK.DLL programs do not display the correct characters.
Where as the DigiPan does. DigiPan sets the sound card to sample at 11025hz. 
The WINPSK.DLL is supposed to set the sample rate at 8000hz. But I think it's not.
The sound card is stuck at 11025 sample rate. The reason I think this is so is that the 
xtal oscilator to the sound chip (ESS 1869) is 14.31953 vs 14.31818Mhz or +90ppm
error. This is not much of an error. But when I receive a PSK31 signal with WINPSKse
I get errors of -5000ppm to -7000ppm which is huge!!!! Also 60% of the displayed text
id garbled. I think, but again I'm not sure, the sound card is sampling at 11025hz and not
8000hz. But how do I prove this?
Regards,
JohnB
K1JEB

> -----Original Message-----
> From:	Cyberia [SMTP:[email protected]]
> Sent:	Thursday, April 04, 2002 5:42 PM
> To:	[email protected]
> Subject:	Fw: [Kenwood] PSK31 and sound card sampling rate.
> 
> > ----- Original Message -----
> > From: "David Cook" <[email protected]>
> > To: <[email protected]>
> > Cc: "'Cyberia'" <[email protected]>
> > Sent: Thursday, April 04, 2002 1:15 AM
> > Subject: RE: [Kenwood] PSK31 and sound card sampling rate.
> >
> >
> > The capabilities of your sound card should not be confused with the sample
> > rates that a given application supports.
> 
> Did I misundertand his query? It sounded to me as though he wanted to adapt
> the soundcard's sampling rate to accomodate the software (not the other way
> around).
> 
> You snipped his original post from your reply, wherein he said "DigiPan
> likes 11025 and WINPSK.Dll (Dx4Win) likes 8000. Unless WinPSK.dll sets it
> automatically." I took this to mean that unless WinPSK.dll sets the
> soundcard's sampling rate to 8000 automatically, he wishes to do so
> manually. He asked how to accomplish this. I suggested that the methodology
> for doing this is dependent on both the OS and vendor.
> 
> 
> 
> - - -
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> 
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