05 Mar 08 08:42, TOM WALKER wrote to ROY WITT:


 RW>> Back in the fifties, I had a friend with a 1953 Mercury that had
 RW>> dual glass pak exhaust on it. He could open a certain garage door by
 RW>> driving by and revving the engine to create the right frequency to
 RW>> open it. Back then, the frequency was a certain tone, rather than an
 RW>> RF signal. As were the early remote controls on TV sets of the day.

 TW> Some of the Early TV remotes were Ultrasonic Sound also. The
 TW> Origional Zenith is one that comes to mind.

That was my first remote TV...if you held the remote to your ear when you
clicked a button, you could hear it ping and vibrate. Of course, that was
the hammer or whatever they used to generate the ultrasound, you never
heard the tones.

                R\%/itt



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