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 ...
http://pdfserv.maxim-ic.com/en/an/AN3765.pdf
The older SAW filter designs would "wiggle" the TX frequency to
compensate for any slight mismatch between the TX and RX filters.
-rick
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