NY wrote:
> I never knew that early ultrasonic remotes were mechanical whistles
> operated by the buttons.

Another US strategy was 'banging' an aluminum rod which emitted the US tone.

I don't know, but that might've been how mine worked.  I never
disassembled it, but the clunk seemed/ felt/ sounded/ more like a hammer
blow than an 'accordion'.

--
Mike Easter

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