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

[Steve Byan]

On Dec 25, 2009, at 11:51 PM, 2002tii wrote:

> 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.

If you were designing a PLL synchronous detector that attempted to maintain phase coherence during a selective fade lasting several seconds, what loop bandwidth would you choose?

Given such a loop bandwidth, how would you arrange to achieve lock after tuning the receiver without waiting an inordinate period of time?

Not that I'd ever spring for a Sherwood SE-3.

Best regards,
-Steve

-- 
Steve Byan <stevebyan at me.com>
Littleton, MA 01460