The "center of the passband to the nominal pitch value" only occurs at
higher pitches and/or narrower passbands.
Think about the case where you have 1.5 kHz width selected and a pitch
of 500 Hz. You defintely do NOT want the center of the filter and the
pitch to be equal,or you'd have terrible opposite sideband suppression.
The calculations done internally in the K3 to adjust the IF and AF
passbands based on the settings of center frequency, width and pitch are
fairly complex.
"Zero beat" has to do with frequencies, not filter responses, and
changing the filter edge should have no practical effect on whether or
not you are zero beat. I say practical because the calculations done
inside the radio coupled with finite resolution of the various
oscillators may result in a 1 or 2 Hz difference, and someone is bound
to measure this :-)
Finally, the new offsets apply to receive only. They have zero effect on
how the radio is configured on transmit.
73,
Lyle KK7P
...
It appears if you do this, you might also have to adjust the filter
offset to bring the center of the passband back to the nominal pitch
value.
...
I installed the 4.81 beta firmware and I am able to change the
crystal filter
offset as described in the firmware notes... Previous to this release
I would have assumed that the crystal
filter is centered on my chosen CW pitch suggesting a 0 KHz offset. If I
choose one of the 3 offsets am I now listening (and transmitting)
slightly
off zero beat...
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