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

2002tii bmw2002tii at nerdshack.com
Fri Dec 25 23:51:11 EST 2009


Regarding my comments about the SE-3, Cecil wrote:

>that is not at all the experience I have seen nor heard from a local 
>that used one for a very long time.

All the ones I've seen perform similarly.  Some folks may have 
tighter temperature control in their shacks than I do, so the lack of 
temperature compensation may not be a practical problem for some 
users.  However, the need for manual guidance (intolerable in a PLL 
demodulator, IMO) is no secret -- it is described on the 
manufacturer's web site.

I've designed and built more than a few different PLL detectors over 
the last 30 years, and the worst of the bunch performed a lot 
better.  There are also commercial designs that perform well.  I 
think the folks who sing the SE-3s praises do so simply because they 
haven't used a PLL detector that works as one could (and 
should).  Horse-drawn buggies must seem really fast to someone who 
hasn't ever seen a car.  If an SE-3 fills someone's needs, fine -- 
but it is far from the best that can be done, and the price is 
outlandish (IMO) in light of this shortfall.

Best regards,

Don






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