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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: sci.electronics
Subject: Thanks for help with RF remote control
Message-ID: <740@neoucom.UUCP>
Date: Sun, 25-Oct-87 21:52:47 EST
Article-I.D.: neoucom.740
Posted: Sun Oct 25 21:52:47 1987
Date-Received: Sat, 31-Oct-87 05:39:34 EST
Organization: Northeastern Ohio Universities College of Medicine
Lines: 18
Keywords: Genie remote control

I just wanted to say thanks to the number of people that offered
assistance with the Genie AT 390 remote control unit I asked about.
My question was, "what frequency is it?"   It turned out, quite
logically, that it is 390 MHz.  The remote uses a a pseudo-ramdom
square wave modulation that gives its output about a 5 MHz
bandwidth!!  This wide band modulation made it impractical to
measure the carrier fequency accurately on a digital counter.  I
solved the problem by borrowing a spectrum analyzer from our
microwave systems engineer and using a plastic screwdriver to
adjust the remote's trimmer cap for a spectrum centered on 390 MHz.
Now my remote activates the receiver from about 1/2 block away,
rather than a few feet!

Thanks to all who offered help whom I couldn't reply to via email.

Bill Mayhew
NEOUCOM
(wtm@neoucom.UUCP)