Reg, G4FGQ wrote:
"It may be possible but where is it?"

In the shortwave broadcast plant I worked in 50 years ago we had a 3.5
KW AM Raytheon "Autotune" transmitter we used to talk back to our
program relay transmitting station in another country. We called it our
"order-wire " transmitter. It or its twin were sometimes used for
broadcasting but it was low in power for that job.

This autotune transmitter had a rotary telephone dial on its panel for
programming its mode, operating drequency, etc. You could instruct it to
listen to instructions, then dial in A-3 for AM, followed by the
frequency you wanted it to operate on, such as 15,925, hit the go
button, then stand back and watch the knobs spin as it tuned itself up
completely. including putting the desired power into a dummy load. A
ready lamp informed you it was good to go on the air at the push of a
button. It worked like a charm.

Collins made autotune transmitters which are now military relics of
WW-2. I never toyed with one of those.

Best regards, Richard Harrison, KB5WZI