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[aprssig] FTM-350 cables

Stephen H. Smith wa8lmf2 at aol.com
Thu Mar 10 22:48:36 UTC 2011


On 3/10/2011 12:45 PM, Julian, G4ILO wrote:
>
>
> A word of warning. The clocks in these cheap USB sound devices are not
> very accurate and that can cause problems with 1200baud packet signals
> being decoded because the baud rate is wrong.

That's why I use the iMic as my sound card building block.   It has a good 
crystal-controlled timebase and "just works" out of the box.

[The really SEVERE calibration issues arise with analog SSTV where cumulative 
timing errors build up over a 30-120 second time frame, causing pictures to be 
severely slanted.]


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Stephen H. Smith    wa8lmf (at) aol.com
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