Post by Tim Wright Post by Charles Bishop
Car Talk is in repeats, of course, and "today" (30 July, 2017) they
had the question about extending the range of a car remote, by
pointing it, not in the direction of the vehicle, but back at the
chin of the person holding it. They then extended this to a tv
Did we (FCVO) ever figure out if this was possible? I suppose, given
a large enough car parking lot I could find out what the range was,
with and without a chin, but I'll ask here first.
I don't know about car remotes, but I doubt it would work with a TV
remote since most of them are IR and thus line of sight.
I have a GDO on the roll up door on my shop building. When I try to
open it from my driveway, just in front of my garage door, it won't
open. However, if I tuck the remote under my chin, like described
above, it will open from there. So that part does work.
I don't know how to aim a car remote control; none of those I've seen
have any obvious aerial or direction-indicator. They seem to operate at
radio wavelengths, and I have noticed that putting a radio receiver
close to my body can affect reception - not always for the better - so I
suppose body proximity might make a car remote control work better (or
worse). I'm not sure that I want to use my body or any part of it as a
radio amplifier though.
I have heard of malefactors using radio amplification equipment to
operate 'keyless' car systems from a much greater distance than
normal; they detect the code emitted by the owner's device, by using a
sensitive receiver at a distance, then transmit the unlock signal also
from a safe distance so that they can just walk up to the car, get in,
and drive off.
TV remote controls all seem to be infra-red line-of-sight devices, so
pointing one of those at your chin will only work if your chin reflects
enough IR back to the TV.