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

[Steve Wedge]

John, I've noticed the same thing: the AGC does seem to make the receiver - in the absence of signals - roar quite a bit with my early (#770) K3.

I've attributed a lot of the noise to computer and suburban hash, but listening with my old Drake receiver shows things much quieter.  Noise reduction does help, but it would be nice to quiet this down as John suggests.

My .02 

Steve, W1ES

-----Original Message-----
>From: John Chappell G3XRJ <john at g3xrj.com>
>Sent: Oct 8, 2010 8:22 AM
>To: Elecraft at mailman.qth.net
>Subject: [Elecraft]  K3 AGC THR doesn't go low enough
>
>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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