[Elecraft] APF preview: very nice

[The Smiths]

Chuck,
 
Something you can try at reducing the ringing noise is to keep your IF Shift centered on the Pitch Freq.  Then when you tune in a signal, move your RIT to tune the station about 20Hz lower than Pitch freq.  This will put you away from all of the noise in the center of the IF, now move your APF Fc (Shif knob) to Peak the station 20Hz lower.. This will bring up the signal as it should, but hide all the Center IF ringing associated with the center IF freq.  Just a little thing to try... 73
 
> Date: Sat, 30 Oct 2010 15:40:09 -0500
> From: charles9415 at att.net
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] APF preview: very nice
> 
> I was able to try the new APF firmware last night. It is very dramatic,
> and I find it helpful in extremely weak signal situations. It's great 
> to have this
> available at the push of a button. I would not use it every situation, 
> nor would
> I tune around the band with it because the ringing in the background 
> without
> a signal present sounds like very weak high speed code to me-- I find 
> this distracting.
> 
> I find myself switching to the "fine" frequency resolution (1 Hz steps)
> when using the APF, to tune across the nose of a signal to get it just 
> right.
> 
> My K3 has only a single receiver, but I have three CW filters: 400, 250, 
> and 200 Hz.
> I do find myself accidently switching filters by tapping the button 
> instead of holding
> it to get APF, but that has no drastic effect on the signal I'm trying 
> to copy.
> Indeed with APF engaged I don't notice much difference when I switch in
> different XFIL's. That's probably because I rarely use anything wider than
> 350 or 400 Hz DSP selectivity.
> 
> This is a real worthwhile improvement for CW operators!
> 
> 73,
> Chuck Guenther NI0C
> K2-10 s/n 5853
> K3-100 s/n 1061
> 
> 
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