27 Aug
2002
27 Aug
'02
1:13 p.m.
On Wed, 28 Aug 2002, Tony Duell wrote:
Some US company (I forget who) made an ultrasonic
remote controlled valve TV
where the remote was essentially tuned metal bars that were mechanically
hit when the button was pressed. No electronics in the handset at all.
The receiver in the TV detected one of 4 (or so) different frequencies
corresponding to the 4 buttons on the remote, and then operated a relay
to trigger the appropriate function (I think channel selection was done
using an electromechanical stepping swtich, etc).
-tony
I think that was Zenith, My uncle used to have one. It would turn on if you
jingled your keys...
Peter Wallace