Re: VHF or UHF?
"Supersonic" in those days meant pitched above the range of hearing
A heterodyne was (and is) a beat note created by mixing two signals together.
So a superhet beats a local oscillator with a signal to create a signal on a new frequency above the audible frequency range.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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