On Sun, 04 Aug 2019 12:45:09 +0100, Daniel James 
declaimed the following:

>anyone would deliberately emulate 1960s (1950s?) TV technology when

Remotes of that period had just two buttons... Power and Volume. And volume
tended to be "mute, low, medium, high" IN SEQUENCE.

And the remote functioned by sending an ultrasonic whistle chirp (each
button compressed a bellows against a spring loaded valve -- when the
pressure was high enough, the valve would open and the air would pass
through a tuned frequency whistle port; different frequency for power vs
volume).


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/

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