It's almost as if the T/R relay is dirty, but it doesn't have one.
Hi Geoff,
Some of the very early 509's DID have a T/R relay, and that was my first
thought when I read your description of the problem.
If you have the solid state version in your rig, I'd suggest checking the
voltages on the board with the T/R diodes to make sure they're turning
on/off properly. You'll have to catch it in the 'bad' state to see if the
voltages are off. A weak transistor not pulling all the way up or down
would be enough to put the T/R diodes in the wrong state. A leaky cap could
give you the same problem.
Keep us posted on your troubleshooting, and maybe something you find will
click with someone.
73,
ed - k9ew
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