K3: RF Gain, Squelch

Posted by Phil Hystad on Jan 12, 2010; 4:11am
URL: http://elecraft.85.s1.nabble.com/K3-RF-Gain-Squelch-tp4289745.html

I have never really understood the connection between RF gain and squelch controls.  I first saw this when I got my first modern rig, the Icom 756 Pro III.  And, I see this kind of combo with the K3 too.  I never had experience with this back in my early ham operator days (~1960s).

So, can someone explain the behavior.  Let's assume that I have squelch operative for FM only.

On CW or SSB I see that RF gain maximized is the control knob turned all the way clockwise.  But, as I back off the RF gain (counterclockwise) there comes a point where the S-meter starts to increase even though there is no apparent signal.  Turning the RF gain fully counter clockwise pins the S-meter.

So, what is going on here.  What is this connection between turning "down" RF gain and the S-meter increasing.  Now, I have the same behavior (roughly) on my Icom Pro III and I never understood that either.

Thanks for any explanation you can contribute.

73, phil, K7PEH
K3 owner for one full week now.
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