Re: An AGC story

Posted by Don Wilhelm-4 on Dec 09, 2010; 3:00pm
URL: http://elecraft.85.s1.nabble.com/An-AGC-story-tp5817486p5819428.html

  Barry,

Without doing any measurements it may be difficult to say precisely, and
I would think there would be a bit of difference from one K3 to another.

However, there is a quick and easy way to accomplish that - note that
the S-meter increases as the RF gain is reduced.  So if you want to
increase the AGC Threshold by (say) 3 S-units, disconnect the antenna,
and reduce the RF Gain until you move the no-signal S-meter up by 3
S-units.  That should be close to your goal.

73,
Don W3FPR

On 12/9/2010 9:07 AM, Barry N1EU wrote:

>
> Cady, Fred wrote:
>> I made some measurements and have posted the results for your perusal
>> and information at www.ke7x.com.
> Very interested findings -  Fred has a graph of AGC action with AGC THR=8
> labeled figure 3 on http://www.ke7x.com/home/the-k3-agc-story  :
>
> So I ask this group: is it possible to raise the AGC Threshold from s3 to s6
> or s9 by simply reducing the RF Gain control?  Can anybody estimate what
> settings of the RF Gain control would accomplish that?
>
> Barry N1EU
>

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