[Elecraft] 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