[amsat-bb] Re: Auto-Tune

Nigel Gunn G8IFF/W8IFF nigel at ngunn.net
Mon Nov 30 06:42:58 PST 2009

True, but why are we generally obsessed with carrier leak (or a lack of it) on SSB signals?
A bit of leak, say 20-30dB below peak, would allow for synchronous detectors and frequency tracking of drifting signals 
by the radio, no computer involved.

Greg D. wrote:
> I believe that automatic tuning of the downlink receiver will only work with FM, as an output of the FM discriminator can be used to give an error (difference) signal for tuning.  I don't believe this is possible with an arbitrary SSB signal.  The only way SSB/CW can work is to have a known signal to analyze, such as digital or a single CW communication channel.  The software used to decode AO-40 middle beacon, for example, was capable of providing a tuning output, and I've seen CW and PSK sound card software do some limited tracking as well.  But a random (i.e. voice) SSB signal?  Don't think that's possible.

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