[Elecraft] K2 AGC, Seems a bit soft

Paul Pollock pbell3 at npgcable.com
Sun Aug 26 01:12:35 EDT 2007


I am enjoying my recently completed K2-6148 very much, but I had a  
couple of questions and thought others might have some constructive  
thoughts.

While some folks like a slightly soft AGC in the receiver, I'm one of  
those folks that finds that soft signals received softer than loud  
signals (especially SSB) is tiring. I prefer a very stiff and level  
AGC. Mind you, this has nothing to do with the fast/slow delay rates  
or anything along those lines.

1). My K2 exhibits good AGC performance and I believe it works as  
designed, but it is a soft AGC. Are there any ideas on modifications  
to the AGC IC (LM833) that might stiffen the AGC performance?

2). I'm another of those folks where my AGC threshold voltage will  
not go above 3.7x volts. It is my feeling that a threshold set so  
that the AGC actually releases at the noise level is better than a  
setting where the AGC is ON at all levels. On my K2 the AGC never  
releases at any level. Any thoughts on getting the AGC to release  
correctly?

Thanks in advance!
-Paul Pollock KD7BWB



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