Posted by
Barry N1EU on
Dec 09, 2010; 3:10pm
URL: http://elecraft.85.s1.nabble.com/An-AGC-story-tp5817486p5819451.html
Thanks Don. I just realized that I can do some quick experiments to get my
answer using an XG2's s3/s9 capability and noting audio level increase with
AGC Off and then with AGC On and reducing RF Gain until same audio increase
is accomplished.
An aside to KE7X and W4TV: I too wish we could try experimental firmware
that significantly raised the max AGC THR value.
And to K6LL: Yes, I too fear loss of weaker signals
73, Barry N1EU
On Thu, Dec 9, 2010 at 3:00 PM, Don Wilhelm <
[hidden email]> wrote:
> 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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