[Elecraft] APF

[Guy Olinger K2AV]

May I suggest that one of the necessities of using APF is to throttle back
the RF gain so that the AGC is not pushing up the noise to the level of
forcing what sounds like ringing.  When I'm hearing what sounds like
ringing, moving back the RF gain (or removing PRE, or using ATT) will
usually clear it up.  Using slow AGC usually does NOT help much, but backing
off RF gain so the background noise is only moderate or less usually helps.

73, Guy.

On Wed, Jan 26, 2011 at 6:52 PM, Barry N1EU <barry.n1eu at gmail.com> wrote:

>
> Forget it - full stop!
>
> I just ran a spectral analysis of the current firmware versus the very
> first
> APF implementation (mcu 4.17 dsp 2.65) from 11/3/10 AND THE PLOTS ARE
> ABSOLUTELY CONGRUOUS!  The APF implementation hasn't changed a bit (or a
> byte).
>
> Have a look:  http://n1eu.com/k3apf.gif
>
> magenta and green plots are taken with width = 200hz
> aqua and yellow plots are taken with width = 100hz
>
> Barry N1EU
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/APF-tp5963894p5964669.html
> Sent from the [K3] mailing list archive at Nabble.com.
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