?
Stan, the fact that 6m is working eliminates a lot
of possible problems. I'd pull the HF drive cable to the HF amp/filter assembly
and see if you have HF drive on that line when in TX. If you do have drive, the
problem is in the amp/filter sections. The service manual should tell you what
drive level you should find.
?
If you find no drive on that line, then the problem
is upstream somewhere exclusive to the HF sections of your 690...
?
One thing I found with Kenwoods of?the
450/850/790A vintage is that the wiring/solder connections are prone to
intermittents with flexing of the board when pulling the "harmonica" connectors.
I've also noticed that some of the boards are thick with flux that needs to be
removed...
?
73...Jordan VE6ZT
?
?
----- Original Message -----
Sent: Friday, February 23, 2024 4:22
PM
Subject: Re: [Kenwood-Amateur-Radio]
TS-690S transmits on 6m but not on HF
Thanks for all of the helpful replies!
Jordan, I have
some RF sniffer probes and a spectrum analyzer, so I will probe around and see
what I find.
All of the coax cables and other connectors seem to be plugged
into the right spots, but I'll double-check everything again.
Bob, I
would appreciate a photo or two of your RF board.
73,
Stan N6BYU
