Re: K3: AGC THR doesn't go low enough

Posted by P.B. Christensen on Oct 08, 2010; 6:01pm
URL: http://elecraft.85.s1.nabble.com/K3-AGC-THR-doesn-t-go-low-enough-tp5615857p5615933.html

>I had resigned myself to living with the AGC off because I can't stand
>the sound of the audio with it on in CW mode..

I have similar perceptions in CW mode and generally leave AGC turned off.
The only problem I've encountered living in Florida is that on the 40m-20M
bands, the 100 kHz/sec sweep from the Department of Homeland Security's
ROTHR system nearly leaves me with permanent hearing damage.

http://tinyurl.com/2egfnjo

The sweeps occur at regular intervals, usually around 12 minutes apart from
three ROTHR transmit facilities located in TX, VA, and PR.  With the SDR-IQ
running, I can usually react in time to activate AGC before the sweep
appears on my listening frequency.  However, when I'm not looking at the
screen, the result is pretty painful.  I know that the K3 firmware was
updated some time back to include a peak-limiter function, but it seems to
respond after the fact.

Paul, W9AC



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