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From: JKOSS00@RICEVM1.BITNET (Jordan Kossack)
Newsgroups: sci.electronics
Subject: car alarm xmtrs
Message-ID: <1798JKOSS00@RICEVM1>
Date: 23 Jan 91 07:14:56 GMT
Organization: Rice University - W5YG
Lines: 24

I'm looking for information on car alarm transmitters - not
Lo-Jack, rather those little key-chain transmitters that turn
the alarm on/off remotely.  I seem to recall folk saying (on
rec.radio.shortwave - about a year ago) that they operated at
310 MHz or thereabouts.

Specifically, I would like to know actual frequencies, the
modulation method, protocols, etc.  Anyone with information
is welcome to send e-mail or post if you think it is of
general interest.  I'm just curious and not related to any
international car theft ring.   :-0

However, I have wondered if the number of individual codes
was low enough that one could deactivate all the car alarms
in the area (within a couple of seconds) by transmitting all
of the codes.  Those alarms get really annoying when they
all go off at once during a thunderstorm . . .    ;-)

-
          jkoss00@ricevm1.rice.edu | Jordan Kossack | n5qvi
     -----------------------------------------------------------
        Congress has a distinguished tradition of completely
       misunderstanding the Constitution and not having a clue
     about what it's like.    -- Earl Ryan  [ Nightline, 4 Dec ]