[Elecraft] [K3] AGC THR and noise

[Don Wilhelm]

Steve,

Yes, I know it sounds counter-intuitive, but if you establish the right 
frame of mind, it does become clear.

You might want to consider that the audio level from the K3 is what is 
heard after the AGC is applied.
If you set the threshold so low that the band noise activates the AGC, 
then the noise will reduce the gain of the radio.

The point where the noise increases can be an indication that the AGC 
threshold is now set above the band noise - of course you would do that 
check in an area where there are no signals present.

73,
Don W3FPR

Steven.Zabarnick at notes.udayton.edu wrote:
> I'm somewhat puzzled by the behavior of the AGC THR adjustment with respect
> to band noise. My understanding is that the AGC THR setting adjusts the
> level at which the AGC is activated. Thus, I would expect when listening to
> band noise (QRN) that if the noise is activating the AGC, using a higher
> number would prevent AGC activation, resulting in a lower background band
> noise. But, my experience with the K3 is just the opposite. When adjusting
> the AGC THR setting I get lower background band noise with a lower setting
> -- as a matter of fact, a setting of 2 (the lowest AGC THR) signficantly
> reduces the background noise relative to higher settings.
>
> Can someone explain this to me?
>
> Steve N9SZ
> K3 #1672
>
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