Another K3 feature that removes yet another external box in
my system! I can finally get rid of my Autek QF1 when this
is implemented!
I really like this scenario from a control layout logic
standpoint. Great idea, Rich!
One thing, tho, in addition to the panel buttons, there has
to be a command in the command set to "reset" the APF back
to where it was before, hopefully from the git-go. One of
the most confounding things about using my old TS850 with
N1MMLogger was I had to physically punch the RIT button off
and remember to center the knob (it had no center detent
either!). Loved the radio, hated that feature!
Its oh so much easier to include {CLEARRIT} in the TU
message to reset the RIT after a QSO! So I would ask that a
software command to clear the APF also be included with this
feature so that N1MM developer Jedi K3CT can create a
{CLEARAPF} command for the feature (Or possibly anybody
could create one with a CATHEX macro embedded in the TU
message).
I look forward to this feature. I will be among FT1000'ds
this weekend and will explore the APF feature Friday morning
to see how it works (if I have time off during contest
setup). I have never used a modern Yaesu rig in CW, so
there is always a first time!
If its anything like my Autek QF1, I will like it!
See all of you in the pileups (from NQ4I)!
-lu-w4lt-
----------------------
Message: 32
Date: Wed, 27 Oct 2010 16:54:34 -0400
From: Richard Ferch <ve3...@storm.ca>
Subject: Re: [Elecraft] APF For K3
To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Message-ID: <4cc8918a.7060...@storm.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Here is an operational scenario:
You are CQing in the CQ WW CW contest. There are other loud
stations
CQing on either side of you. You have adjusted your SHIFT
and WIDTH
controls to eliminate the adjacent-channel interference
while still, you
hope, being wide enough to catch anyone calling you.
A weak station replies to your CQ, but he's some distance
off your
frequency, although still within your bandpass. You'd like
to be able to
put an audio peaking filter on his signal without affecting
the rest of
your setup.
You don't want to change your sidetone pitch; that's a
separate question
for a separate discussion. You don't want to use RIT or CWT,
because
that will bring one of the adjacent loud signals into your
bandpass.
Anyway, the desired signal is too weak to trigger CWT.
Likewise, you
don't want to shift your main DSP filter bandpass (the
"context");
you've got this set up for where you are and you don't want
to change it
just for this one 30-second QSO. If you didn't have an APF,
you might
try narrowing the DSP filter bandwidth, but he's far enough
off-frequency that doing so would run the risk of losing his
signal,
meaning you would have to fiddle with both SHIFT and WIDTH
to home in on
him, and that takes time to do, plus more time to restore
them after the
QSO.
What you would really like to be able to do is to adjust an
audio peak
filter's frequency so that it is on top of the received weak
signal, but
without affecting the context (your DSP shift and width,
your sidetone
pitch, or your transmit frequency - these should all stay
where they were).
My suggestion would be to use one of the buttons (DUAL PB
seems to be a
possible candidate here) to turn the APF feature on, and
while the
feature is on, the SHIFT and WIDTH controls would adjust the
APF
frequency and width (or Q) and would have no effect on the
context
filtering. RIT and SPLIT would still work normally, it's
just SHIFT and
WIDTH that would have been subverted to do the APF
adjustments while the
APF is on. If you really did want to adjust the context
filter width or
shift, you would have to turn APF back off to do so. Once
the QSO with
the weak station had been successfully concluded, you could
either turn
APF off, or else leave it on with its width adjusted to
include the
entire context bandpass, and carry on CQing.
My 2c worth.
73,
Rich VE3KI
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