Ian White wrote
I see your point... but what do you actually tune for, when you do
it manually?

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Frequency is selected by the receiver, not the transmitter.

The transmitter is OFF when I do it manually and I tune for maximum
noise in the receiver. How do YOU do it? smiley

If I can't do it when the transmitter is ON then neither can an
automatic ATU. It would have to be more clever than I am.
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Regards, Reg, G4FGQ