Mark,
Sorry about your failed effort. There is little in the RX path other
than Q3 and U1 that is not also used in TX.
If you have equipment that can do signal tracing at 222MHz, just trace
the signal path. There should be a significant increase in RF voltage
at the output of Q3 and more at the output of U1. If not, check to be
certain K1 has not been damaged. K1 should be available from Elecraft
since it is used in the XV144 which is still in production.
73,
Don W3FPR
On 9/25/2020 1:21 PM, k2qo wrote:
Don and gang,
I replaced Q3, U1 and the ADEX mixer. Results? Transmit works FB as before
and the RX still has no sensitivity. No change at all. I ran through the
setup related to the RX section and one thing stands out.
Part VIII: RX Input Alignment
Trimmer cap C1 has no effect on the AC voltage at the phone output
connector. This is the same result I had before replacing the 3 parts.
I think I may be down to signal tracing starting at the N connector. But
without a list of test points and voltages, this may be a nonproductive
PITA.
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