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K3 AGC attack rate

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Gary Hinson

K3 AGC attack rate

Hi Elecrafties.

Is it possible to alter the K3's AGC 'attack rate' (for want of a better
phrase)? Specifically, I'd quite like to stop the AGC-S on SSB from
dropping the gain so markedly in response to a short noise spike.

73
Gary ZL2iFB
K2 K3 W2 and mojo

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Don Wilhelm-4

Re: K3 AGC attack rate

Gary,

There are several AGC parameters that overlap, so I don't know which one
is creating the most grief for you.
I encourage you to try adjusting the AGC threshold and slope as
indicated in my "Noisy K3" article on my website www.w3fpr.com. I would
think the slope parameter might be effective in reducing the effect of
your local noise spikes.

It may be better to let the AGC handle the noise spike, but reduce the
delay so the reduction of gain is shorter. A bi of experimentation with
all the AGC parameters may be in order.

73,
Don W3FPR

On 8/22/2011 8:33 PM, Gary Hinson wrote:
> Hi Elecrafties.
>
> Is it possible to alter the K3's AGC 'attack rate' (for want of a better
> phrase)? Specifically, I'd quite like to stop the AGC-S on SSB from
> dropping the gain so markedly in response to a short noise spike.
>
>
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Guy, K2AV

Re: K3 AGC attack rate

Try turning on NB, with LEVEL to T 1-7, 2-7, or 3-7. Set IF OFF. I use
that for key clicks on CW and it's marvelous. I leave NB set to 1-7 that way
for use when clicky stuff comes on. 73, Guy

On Mon, Aug 22, 2011 at 9:00 PM, Don Wilhelm <[hidden email]> wrote:

> Gary,
>
> There are several AGC parameters that overlap, so I don't know which one
> is creating the most grief for you.
> I encourage you to try adjusting the AGC threshold and slope as
> indicated in my "Noisy K3" article on my website www.w3fpr.com. I would
> think the slope parameter might be effective in reducing the effect of
> your local noise spikes.
>
> It may be better to let the AGC handle the noise spike, but reduce the
> delay so the reduction of gain is shorter. A bi of experimentation with
> all the AGC parameters may be in order.
>
> 73,
> Don W3FPR
>
> On 8/22/2011 8:33 PM, Gary Hinson wrote:
> > Hi Elecrafties.
> >
> > Is it possible to alter the K3's AGC 'attack rate' (for want of a better
> > phrase)? Specifically, I'd quite like to stop the AGC-S on SSB from
> > dropping the gain so markedly in response to a short noise spike.
> >
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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Arie Kleingeld PA3A-2

Re: K3 AGC attack rate

In reply to this post by Gary Hinson

Gary,

If you mean that the K3 AGC is too sensitive to a noise spike (I
understand dropping gain = reducing gain) then switch on the AGC PLS (=
set it to NOR) in the Config, or switch on the NB and experiment with
the DSP and IF noiseblanking.

73
Arie PA3A

Op 23-8-2011 2:33, Gary Hinson schreef:

> Hi Elecrafties.
>
> Is it possible to alter the K3's AGC 'attack rate' (for want of a better
> phrase)? Specifically, I'd quite like to stop the AGC-S on SSB from
> dropping the gain so markedly in response to a short noise spike.
>
> 73
> Gary ZL2iFB
> K2 K3 W2 and mojo
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>