I never use the speaker and I ride the RF gain. When I hear the signal
rising I can catch it in time to avoid limiting. However, I only use this
method when the QSB is a fast flutter which causes me problems. When the
QSB is simply a slow up and down wave I'll use AGC-F which is fine. This
morning I had both rapid and slow QSB. The rapid QSB was the problem
while the slow QSB was easily dealt with by riding the RF gain.
Kevin. KD5ONS
On Tue, 21 Jun 2011 19:24:03 -0700, Dave Hachadorian <k...@arrl.net> wrote:
> There are two major problems with turning off the K3's AGC:
>
> 1. There is very little dynamic headroom until the AF Limiter causes
> severe distortion on even a moderately loud signal, even if the AF
> Limiter setting is max.
>
> 2. Never use the speaker amp with AGC turned off. It takes just one
> dit from a loud signal to destroy the delicate speaker amplifier IC.
> That will require a $110 factory repair, plus postage.
>
>
> Dave Hachadorian, K6LL
> Big Bear Lake, CA
>
>
>
>
> -----Original Message----- From: Kevin Rock
> Sent: Tuesday, June 21, 2011 10:12 AM
> To: Elecraft
> Subject: [Elecraft] [K3] AGC-OFF
>
>
> I was having a hard time making out characters today during my daily sked
> into the Southeast. The QSB was a fast flutter and was chopping up the
> letters badly. I was running fast AGC and thought maybe slowing it down
> may help. It did - a little. So I took the next logical step and turn
> AGC off entirely. The characters popped right out at me. I just rode
> the
> RF gain as the signal went through its slower QSB while the fast flutter
> QSB did little to bother me. AF gain was cranked to high as I normally
> run it while RF gain was set to where the background QRN was minimized.
> Turning off the AGC helped eliminate the fast flutter problems which were
> causing me difficulties copying.
>
> This is most likely old news to many of you but I have been running AF
> gain at max and controlling volume with the RF (or IF) gain since 1960
> when I first started SWLing on my brother's Lafayette receiver.
>
> I hope this helps at least one of you drag out a new one.
> 73,
> Kevin. KD5ONS
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