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VE2HAR > MT63 12.03.05 05:38l 149 Lines 3933 Bytes #-7326 (0) @ WW
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Read: GUEST
Subj: Re: [MT63] Sound Card Calibration
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Sent: 050312/0246z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:41541 $:9249sentto
Actually Karl, you are wrong to blame "Windows Junk" as you call it.
gMFSK also allows for calibration of the sound card. This is done by
accessing [settings-preferences-devices-sound] and adjusting as needed
there.
Steve/WM5Z
karl larsen wrote:
>
>
> Steven M. Milner wrote:
>
> >Forgive the crossposting to four groups, but I thought that some of
> you may
> >benefit from my experience in setting up PCs for sound card modes.
> >
> >I am trying to set up two computers to work with a number of modes
> including
> >MT63, Olivia, and SCAMP. One computer worked OK on MT63 and
> marginally on
> >Olivia, the other could not receive MT63 or Olivia modes at all!
> >
> >I found that this was due to differences in sound card clock speeds. The
> >nominal clock speed is 11025 Hz but each card varies from that. MixW
> has a
> >procedure for correcting for this variation by tuning in WWV and
> examining
> >the tones with SSTV mode. After performing this adjustment, MT63 worked
> >perfectly.
> >
> >OliviaAid has a user defined sound card setting for compensating for this
> >variation. To find the right setting you need to use a test signal and
> >adjust the setting for maximum S/N ratio. The formula is: (Actual clk
> >spd/11025)*8000 = sound card setting. This is what I ended up with:
> >
> > Sound Card MixW (ppm) Olivia Actual Clk (Hz)
> >Sound Blaster 24bit External -2106 7977 10993
> >Sound Blaster MP3+ External 6983 8098 11160
> >SoundMax Digital Audio Internal 6843 8100 11163
> >
> >
> >
> I am using a Sound Blaster on gMFSK which has every mode known to
> man and I have never adjusted anything. I think your windows junk is too
> screwed up.
>
> karl
>
> >Question for the Oliviadata group...Would data decoding improve if we
> could
> >correct the Paclink software timing for these variations in sound
> card clock
> >speeds? Rick, would it be possible to have a sound card setup in the
> >software with a correction entry?
> >
> >Aloha & 73,
> >Steve - WH6N
> >
> >
> >
> >
> >
> ><< Try MT63 on 80m - great fun!>>
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> >
> >
> >
> >
> >
> >
>
>
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