"Sjouke Burry" wrote in message
...
mm wrote:
Today on the news I heard that a big bunch of electronic garage door
openers weren't working in Churchville Maryland because the govt. at
the Aberdeen Proving Grounds was doing something with a satellite or
something. Tomorrow their going to do the same thing around Aberdeen.

People are paying techs to change the freqs, but some may have paid
for other repairs by mistake, one would assume. Someone in charge admits
he didn't get the word out well enough.

1) Don't they assign frequency ranges to things so that this sort of
thing doesn't happen?

2) How could the use of a frequency mess up the garage door openers?
Even if the govt. signal was stronger, why wouldn't the opener still
work? If the govt. signal was picked up by the opener, how come the
doors didn't open or shut. (Apparently they didn't since they would
surely have mentioned that.) If you are inclined to email me
for some reason, remove NOPSAM :-)
I have used these openers for datatransmission, and the type I used
had 8 tri_state codeswitches.
If the code does not fit, nothing happens, when some outside transmitter
intervenes.
The codestring contained about 42 bytes in total, and it is difficult to
trigger that with some random signal.
In case of interference, you just have to get closer to your receiver,
for it to work.

Or get a signal amplifier, although I'm sure that is not legal.

Mike