Not on the FT-1000D, the APF has an adjustable freq knob,
I find that I have it set 99 percent of the time the same pitch
as the side tone, so not sure that it needs to be adjustable.
Seems if it tracked the side tone freq that may be sufficient.
Problem is that APF should not be limited to use on extreme
narrow filter widths, many times there is no need to narrow
the filter width as there is no adjacent QRM on the weak
signal. The background "noise" on wider widths is easier
to copy through many times than the different pitch background
"noise" on narrow width.
Unless you have used it, it is hard to comprehend what it is
perhaps, but as many have posted, when working properly
it makes copy possible of signals in the noise that is not
possible without.
Merv K9FD
> Not ever having a radio with APF, I've had this nagging question since this
> thread began. Does the Pitch track the center frequency of the BPF?
>
> Wes
>
> --- On Mon, 10/25/10, Wayne Burdick<n...@elecraft.com> wrote:
>
>> From: Wayne Burdick<n...@elecraft.com>
>> Subject: [Elecraft] APF For K3: progress report
>> To: "Roy Morris"<w4...@carolina.rr.com>
>> Cc: elecraft@mailman.qth.net
>> Date: Monday, October 25, 2010, 12:39 PM
>> We might have a field-test revision
>> of K3 code that includes APF
>> sometime this week.
>>
>> In this test version, APF is turned on by rotating the
>> WIDTH control
>> counterclockwise past the 50-Hz setting ("BW 0.05") to the
>> 30-Hz APF
>> setting ("APF 0.03"). This eliminates the need for a menu
>> entry or a
>> new switch function. A new DSP graphic pattern shows that
>> APF is in
>> effect. SHIFT can be used, with either 10- or 50-Hz steps.
>>
>> The APF filter is an "IIR" (infinite impulse response) DSP
>> filter that
>> accurately emulates the equivalent analog circuitry.
>> There's a slight
>> ring to the filter, as expected. Gain is also increased
>> when APF is
>> turned on, compensating for the loss of overall
>> signal+noise that
>> occurs at this very narrow bandwidth.
>>
>> 73,
>> Wayne
>> N6KR
>>
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>
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