[amsat-bb] Re: Auto-Tune

Tony Langdon vk3jed at gmail.com
Mon Nov 30 00:35:40 PST 2009

At 07:08 PM 11/30/2009, 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.

I have heard of it being done in a laboratory/research setting 
(though not 100% sure how good my sources were), but not in production.

73 de VK3JED / VK3IRL

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