I was able to narrow down the problem. It is related to SYNC DATA
(CONFIG:SYNC DT) which forces the same crystal filter to be used for both RX
and TX. As long as SYNC DATA is OFF everything works as expected.
If SYNC DATA is ON:
(1) Toggling between SHIFT/WIDTH and LO/HI CUT is inhibited
(2)
SYNC DATA provides a very short turnaround time by disabling operations that
would require switching the synthesizer frequency between receive and transmit.
(This is analogous to CW QRQ mode.) If you have the new synth installed
(KSYN3A), the delays will be much shorter even with SYNC DATA
After a long pause I started to operate in PACTOR again. My K3 behaves
differently today compared to earlier firmware some years ago. Current FW is
MCU 05.14, FPF 01.19, DSP 02.83.
In DATA A mode:
(1) PITCH shows N/A, in contradiction to the user manual. Seems to be fixed
at 1500 Hz. That's fine
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