Initially posted 6/5/19, now solved. The problem was signal
intermittency with an installed KBPF3 when switch to frequencies below
1.700.
With patient help from Keith WE6R at Elecraft and suggestions from 5 other
list members I was able to confirm the problem was on the KBPF3 board.
Further tests to map the relay switching frequencies from 0.5 to 30Mhz
confirmed that while various relay switching were not consistent they were
all operating when energized. This then suggested faulty U1 and U2,
or corrupt control signals. Three TPIC6C595D from Elecraft were ordered.
These shift registers are daisy chained on their control line so I initially
changed out U1 (first experience at working with this sized IC).
Happily this solved the problem. Along the way I performed an EE INIT
on the radio and did a full calibration so now have a more detailed
understanding of the radio.
Warm thanks to Keith WE6R, Bill NR4C, Ben W4SC, Dave W9PA, Mark WB9CIF and
Mike VP8NO.
73, Nigel ZL2DF
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