[amsat-bb] Re: UISS, GO-32 & 9600pbs

Greg D. ko6th_greg at hotmail.com
Sat Nov 22 10:15:50 PST 2008

Hi John,


> I know you can't actually *hear* 9600bps modulation, hence my request for 
> an 'indicator'.
> I believe one way is that the white (background) noise goes quiet when 9600bps 
> is being received.
> Confirmation - (or strong denials) - of this would be appreciated from the digital 
> experts among us.

I'm by no means an expert on 9600 bps modulation, but the few times I've tried it, I found that there is a different noise-like sound when you have it tuned in, but it definitely does not go quiet.  There's pretty much no way to describe the difference - it's a bit softer, perhaps, maybe a little higher pitched (less low frequency components).  I expect you'll recognize it when you hear it.

Greg  KO6TH

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