Re: K3 hardware AGC experiment shows promise

Posted by Barry N1EU on Dec 05, 2011; 12:29pm
URL: http://elecraft.85.s1.nabble.com/Fw-CQ-WW-DX-Contest-CW-2011-Unofficial-claimed-scores-tp7060148p7062683.html

wayne burdick wrote

Hi all,

The K3's hardware AGC time constant is a compromise between recovery  
time and IMD due to modulation of the loop. C238, on the bottom of the  
RF board near the front, sets this time constant.

We did a little experiment today  . . .

I think it would be informative to monitor whether the HAGC is indeed kicking in during the variety of pileup mush type events not involving very strong signals in the passband.  

For example, could a very visible LED be set up external to the rig that would flash when HAGC kicks in?  A few of us could operate like this in an upcoming contest (e.g., next weekend 10M contest) and confirm whether there's correlation between HAGC and pileup mush.

Barry N1EU