Paul:
Do the 1000MP's have this feature as you describe it, or
only the 1000D models?
I will be around some MP's this weekend, so before the
"battle" begins, I will try it and see how this feature
works so I can get an understanding of it in person.
I have experience with K3, Kenwood and Icom in CW mode, but
zero experience piloting a 1000 series Yaesu in CW. Did
like the "shuttle" knob around the main VFO on the 1000MP,
reminds me of using videotape machines... My mind adjusted
to it instinctively. :)
-lu-w4lt-
Message: 5
Date: Mon, 25 Oct 2010 09:09:51 -0400
From: "Paul Christensen" <w...@arrl.net>
Subject: Re: [Elecraft] APF For K3
To: <elecraft@mailman.qth.net>
Message-ID: <32e1515ef267466faf1d130184387...@dbtoa000>
Content-Type: text/plain; format=flowed;
charset="iso-8859-1";
reply-type=original
> "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?
Icom's use of APF is different than that used in the
FT-1000/D. Icom more
closely emulates the Dual PB feature in the K3 but without
the "context"
feature. What's missing is high "Q" of the centered
frequency. The
FT-1000/D's Q of the audio circuit varies with the tuning
control, but it's
generally greater than 10. When the Dual PB tuning is
enabled on the K3,
and with aggressive NR engaged, I don't hear what sounds
like a high Q
equivalent. The FT-1000/D's APF is more closely associated
with a
single-channel of a multi-band parametric equalizer where Q,
amplitude, and
frequency are all variable. In the FT-1000/D, Q is mostly
fixed, but
amplitude and frequency are variable.
Although the FT-1000/D adds amplification of the centered
frequency -- and
even allows changing the peaking frequency, I think the most
desirable
attribute of the circuit is the high Q ability. Fixed gain
and variable
peaking frequency may be a nice added feature to the K3 if
APF is
implemented, but these are secondary to achieving emulation
of the high Q
portion of the analog circuit in DSP.
Paul, W9AC
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