In a message dated 9/20/2005 5:01:28 PM Central Standard Time,
gprtech@frontiernet.net writes:
> Not this stuff again. Car remotes work by RF (radio). A cell phone won't
> transmit this. Nobody who posts this stuff has ever actually tried it.
> It was obviously made up by someone who didn't know how that the things
> work.
Or maybe they do but are just being mischievous.
>
> The only remotes that ever used ultrasonics were TV remotes, and I'd be
> surprised if a cell phone would send that either.
Which were prone to false triggering by naturally occurring noises. There is
a reason they went to infrared.
Dave
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