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VE2HAR > MT63 12.03.05 15:16l 183 Lines 5534 Bytes #-7316 (0) @ WW
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Subj: Re: [MT63] Sound Card Calibration
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Here is the actual Help on sound card adjustment:
The Requested sample rate, TX rate offset and RX rate offset allow you
to rectify any sample rate problems with your soundcard. Normally you
don't need to touch these but in case your soundcard doesn't support the
default rate of 8000 samples per second or if you know that it has some
sample rate offset, you can correct it separately for transmit and
receive. As an example of a bad case consider this: Your soundcard only
supports 11025 sps, but you know that it actually samples at 11020 sps
on transmit and 11035 on receive. In this case you should put 11025 to
the Requested sample rate box, (11020 - 11025) / 11025 * 1000000 =
-453.5 to the TX rate offset box and (11035 - 11025) / 11025 * 1000000 =
907 to the RX rate offset box. There are also options to enable 8 bit
sound, stereo sound and full duplex. Try 8 bit or stereo audio if you
get errors when gMFSK tries to open the sound device. Full duplex should
not be used unless it's the only option that works; it is unsupported
and generally a bad idea.
So you see what the Author says. If you KNOW your sound card is off,
you can fix it. I have not changed a single thing and mine works just great.
But if I changed to the built in sound card, it would require me to
measure it, and then set up gMFSK to use it. The motherboard sound card
is at 10,500 Hz.
karl
Steve Friis wrote:
> 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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