[Elecraft] APF

[Don Wilhelm]

Brian,

Yes, using APF with a wider bandwidth helps, but a width more narrow 
than 700 Hz should be usable - 400 Hz and more narrow may be "iffy". 
FINE tuning with APF turned on is a necessity.

73,
Don W3FPR

On 3/16/2014 8:44 PM, Brian Hunt wrote:
> My "formula" for tuning very weak signals - almost can't see them on the P3 - is as follows:
>
> - Set the WIDTH to 700 Hz to 1 KHz QRM permitting.
>
> - Turn on NR and set to 5m3 or there about.
>
> - Turn on APF and tune for best audio. Setting the rate to FINE sometimes helps.
>
> This almost completely eliminates noise ringing the filter although the signal does ring a little. YMMV.
>
> 73,
> Brian, K0DTJ
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