Wayne,
1) Outside the 30 Hz APF "peak" what is the background DSP
bandwidth and can that be adjusted?
2) how does one prevent activation of a narrow CW filter (e.g.,
200 Hz) and excessively narrow DSP filtering when activating
APF? Remember, the desired behavior is primarily to peak
the desired signal while reducing the background bandwidth
is a secondary concern.
3) How does one move the APF "peak" (as in the case of the
old FT-1000D where the peak was tunable over most of the
audio range0?
Rather that lose ability to specify basic DSP (and IF) bandwidth
when activating APF, I would suggest overloading the "notch"
control- particularly since auto notch (tap) does not function
in CW - to activate APF.
73,
... Joe, W4TV
On 10/25/2010 2:39 PM, Wayne Burdick wrote:
> 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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