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

[Jim Miller KG0KP]

My first thought on comments about noise on a receiver is that the radio 
they are comparing it to just can't hear as well.

73, Jim

----- Original Message ----- 
From: "Steve Wedge" <w1es1982 at earthlink.net>
To: "John Chappell G3XRJ" <john at g3xrj.com>; <Elecraft at mailman.qth.net>
Sent: Friday, October 08, 2010 9:25 AM
Subject: Re: [Elecraft] K3 AGC THR doesn't go low enough


> 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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