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From: jwatts@hpihoah.cup.hp.com (Jon Watts)
Newsgroups: sci.electronics
Subject: Garage door openers (was 12 V car -> 3 V cd)
Message-ID: <5910003@hpihoah.cup.hp.com>
Date: 4 Jan 91 02:39:50 GMT
Organization: Hewlett Packard, Cupertino
Lines: 28

From: al@qiclab.uucp (Al Peterman)
>I can't vouch for 7803's but I am using 7809's to run my garage door
>openers in both cars.  Never a problem.  
>
>BTW - It's really neat having a working button on the dash to raise the
>door.  Ther's also the security angle that if you get power from a
>source that turns on with the accessories, someone can't raise the
>door by breaking into your car when it's parked in the driveway.  Also
>no need to think about opener batteries...
>

I have a couple of questions aboiut this since I've wanted to do something
similar myself.

Where did you mount the transmitter so that it can radiate effectively?  Most
of them are kind of wimpy and if you mount them in a typical out of the way
place the car body would block off the signal pretty effectively.  I thought of
extending the antenna but it seems to be just a trace on the PC board and not
easy to tap.  Or did you find this is not a problem?

Has anyone else tried this?

>
>-- 
>Alan L. Peterman                                   (503)-684-1984 hm
>                       cse.ogi.edu!qiclab!al

Jon Watts	785-8181	jwatts@mothra.rose.hp.com