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Re: [Discuss-gnuradio] Car alarms and garage door openers

From: Rick Parrish
Subject: Re: [Discuss-gnuradio] Car alarms and garage door openers
Date: Tue, 06 Jun 2006 20:01:34 -0500
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040616

Michael Milner wrote:

I just took a look at my car's keyfob with the USRP RFX400 board (it seems
to transmit around 433.923MHz.  It is using FSK modulation, a few tens of
kilohertz deviation.  It demodulates pretty well, but the centre frequency
isn't very stable (Is there any way to automatically detect the centre
frequency within a range?)
Might be one of these ...


The older SAW filter designs would "wiggle" the TX frequency to compensate for any slight mismatch between the TX and RX filters.


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