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From: wrt@willie.cray.com (William Taylor (1446))
Newsgroups: sci.electronics
Subject: Re: car alarm xmtrs
Message-ID: <100138.8482@timbuk.cray.com>
Date: 23 Jan 91 16:29:17 GMT
References: <1798JKOSS00@RICEVM1>
Reply-To: wrt@steve.cray.com
Organization: Cray Research, Inc.
Lines: 24

In the back of Popular Electronics and Modern Electronics, a company
	called 'Visitect, Inc.' sells transmitters and receivers.  I
	just received my order from them but have not yet installed it
	in my car.  They have 2 models:
		1) $25, 1 button transmitter and receiver (TTL),
			300MHz, 5 volts dc (xmitter and receiver),
			range 60 feet,
			no definable codes.
		2) $50, 2 button transmitter and receiver (CMOS),
			318MHz, 12 volt (xmitter) and 10-24 volts dc receiver,
			range 300 feet,
			59049 definable codes (set by soldering 10 pins to
				1 of 3 positions on both xmitter and receiver).
	Looking at the parts I purchased, so far things look in order and
		I'm now building the circuits to connect to the lock/unlock
		for my car (already has power door locks) [2 extra chips I think].
		The transmitter fits on my keychain and the receiver is a few
		inches of board.

I'm not sure if this answers your questions, but it may help.
-- 
William Taylor
Cray Research, Inc.
wrt@steve.cray.com