[TenTec] Question for Techies, cont'd.

[Dr. Gerald N. Johnson]

On 10/31/2010 5:48 PM, John Rippey wrote:
> Dr.. Johnson, many thanks for the information responding to my question
> about DNR variations. It covers exactly what I was looking for.
>
> I own a Carver preamp that is 25 years old and contains Bob Carver's
> "autocorrelation" circuitry, which does a very good job
> of reducing noise from LPs, etc. I was wondering if Carver could do it 25
> years ago for vinyl discs, why can't today's transceivers excel in that
> department? You've answered the question.

Part of it is that music is much more coherent than voice or even CW and 
part of it is that noise reduction from vinyl may have removed some of 
the characteristics of some musical instruments that tend to produce 
noise like signals, like percussion and quiet wind instruments, not to 
neglect double basses bowing noises and reed instrument linkage rattles.
>
> My interest is principally atmospheric noise, but since I'm in a city, those
> other noise generators come into play as well. The "holy grail" is certainly
> what I was seeking. Again, thanks for the education.

Actually city noises are likely much stronger than atmospheric noises. 
Some data says "atmospheric" noise levels are rising but I believe that 
to be more true in European urban areas than out here near the Boondocks.
>
> 73,
>
> John, W3ULS
> _______________________________________________
>
73, Jerry, K0CQ