[R-390] Best approach for SSB mod on R-390A

[Cecil Acuff]

I think Ten-Tec uses a DSP implementation in the RX-340 and 350.

Les can report on both as he has owned each and still has one.  Last I heard 
it was good but still not up to the Drake R8B level..unless I 
misunderstood...which happens more frequently these days.

Cecil
----- Original Message ----- 
From: "2002tii" <bmw2002tii at nerdshack.com>
To: <r-390 at mailman.qth.net>
Sent: Sunday, January 03, 2010 7:11 PM
Subject: Re: [R-390] Best approach for SSB mod on R-390A


> Andy wrote (regarding synchronous detection):
>
>>(2) The classy way to do it is put a computer and DSP in the loop where 
>>the
>>oscillator is tuned with a D/A converter from the computer. The computer 
>>and
>>DSP do digital spectral analysis and look at the signals all around, then
>>decide what number (frequency) to stuff into the D/A, and consequently 
>>what
>>the oscillator frequency should be. This can be made arbitrarily smart,
>>although more often than not it is still pretty dumb. On some of the $$$
>>receivers, this "digital detector" is pretty good, like the high-end R&S
>>offerings these days. Not for the casual listener, of course. If you have
>>enough DSP horsepower, you do it all digitally with no hardware PLL at 
>>all.
>>Being a DSP-head, this is my preferred implementation, but it takes a lot 
>>of
>>careful DSP programming to make it work well.
>
> It's an intriguing notion, and I'd love to see a good DSP
> implementation.  I have no doubt that Andy knows lots more about DSP
> than I do.  Even with substantial DSP horsepower, I've never gotten
> decent results trying to implement synchronous detection in DSP, nor
> have I seen a decent commercial DSP implementation (though I have not
> seen an R&S DSP receiver).
>
> Best regards,
>
> Don
>
>
>
>
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