APF preview: very nice

[Chuck Guenther]

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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[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: [hidden email]
> To: [hidden email]
> 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
>
>
> ______________________________________________________________
> 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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[Nick Kennedy]

Too bad I didn't get it installed in time for the QRP Zombie Shuffle --
lots of signals needing help there.

It's not easy to find just the right signal that might benefit when you
want to test one, but I've found several in the past couple days.  I
think the APF is going to be a useful addition here.  I prefer operation
pretty much the way it is now.  I definitely want a tunable center
frequency and I prefer minimal complexity beyond that.

73-

Nick, WA5BDU
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