[Elecraft] K3 AGC THR doesn't go low enough

John Chappell G3XRJ john at g3xrj.com
Fri Oct 8 08:22:09 EDT 2010


I like to listen to a receiver with the rf gain set to just below 
antenna atmospheric noise and AGC on - and not raising the rf gain when 
it is switched on.

My K3 is srl 46xx and the only way I get the quiet background I desire 
is to turn the AGC off. This necessitates having the AF limiter turned 
on to save my ears and hopefully the speaker output chip.

I've played around with various AGC settings and in particular the
AGC THR - which if it would go 2 or 3 points lower would appear to 
address the problem.

Anyway, to save a thousand words, this recording sets the scene
http://tinyurl.com/38qo9ud

- made from Main Rx on 3670khz with 2.8khz filter passband set to 
Normal, NR and NB Off.
Sub Rx is identical in performance in this respect.

In all other respects that I use it the K3 is a stunner.

John G3XRJ


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