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VE2HAR > MT63 12.03.05 03:42l 99 Lines 2662 Bytes #-7341 (0) @ WW
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Read: GUEST
Subj: Re: [MT63] Sound Card Calibration
Path: DB0FHN<DB0THA<DB0ERF<DB0HGW<ON0DXC<IW2OAZ<ON0AR<VA2HAR<VE2HAR
Sent: 050312/0116z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:41491 $:5816sentto
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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