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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