Guy:
I am admittedly not a CW maven, I'm sort of a CW "duffer", but your comment
kind of baffles me:
---------
At this point, I have no means of duplicating that in the K3. This is
NOT the same as running narrower bandwidth. If I narrow bandwidth,
then I don't hear the off-frequency callers, some of which are closer
to the up or down stations than me.
-----------
"Dual PB" (press and hold XFIL) allows one, as the manual says, to "focus"
on a given signal that is matched to the sidetone frequency while hearing
other callers above and below that frequency at reduced level (the
"context"). Doesn't that do what the waveforms described on AB4OJ's website
depict? It works that way for me.
Or, I could patch my decades old Autek QF-1 into the audio path and peak
audio tones to my hearts content.
What else is required to accentuate a CW signal better than the tools we
have on hand? A "pitch" control option like Icom Pro series rigs have
(which I ALWAYS seem to forget to reset when I use it!)? If so then put in
a way to restore it to "normal" like the CLR button for RIT/XIT.
I'm all for options!
-lu - w4lt-
Message: 10
Date: Sun, 24 Oct 2010 14:18:56 -0400
From: Guy Olinger K2AV <olin...@bellsouth.net>
Subject: Re: [Elecraft] APF For K3
To: ka...@arrl.net
Cc: Bruce Beford <bruce.bef...@myfairpoint.net>,
elecraft@mailman.qth.net
Message-ID:
<aanlktikpcxwanxob=yp+7llvhb_nwvg-6bcjtl=av...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
No, actually not.
The MP has something "like" APF, without calling it that. On CW if
you turn on EDSP and set contour to 11 oclock and set NR to D and then
set spot to 450, what you will get is a rounded AF response. This
works well running (as opposed to search and pounce) in a contest,
when you want to hear up and down a ways to catch the off-frequency
callers (seemingly about 25% of world population, equals entirely
common, typical tone-deaf to some degree), but don't want the entire
bandwidth of noise roaring in your ear.
At this point, I have no means of duplicating that in the K3. This is
NOT the same as running narrower bandwidth. If I narrow bandwidth,
then I don't hear the off-frequency callers, some of which are closer
to the up or down stations than me.
Throwing away up and down callers easily throws away 10% of run QSO's
depending on how tight you have to squeeze. This is why I have the
"250" roofing filter defined as 350 with the 400 defined as 450. I
will run at 450 if I can get away with it. When it gets crowded, 350
running is really as tight as I want to go, just so I can hear
off-frequency callers. I just need to hear them well enough to get
them in with shift or RIT. 450 with APF is having your cake and
eating it too.
For that matter, if Wayne sees this, a fixed to center mild
NR-generated APF that came out like the MP version but with an
automatic band-pass following center might be a big hit. Try the
above with an MP some time and see if you can mimmick that in K3
firmware. Once discovered, it was always a favorite. That's where I
got stuck on 450 Hz as a center frequency. Just got used to it.
I don't hate my MP. I just wish to H* that it had a K3 style
uncrushable RF IF string.
Yes, APF, and sooner than later, and with a scalar adjustment to how
deep it goes and the width.
73, Guy
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