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

[TJ Dreier]

Those of you experimenting with key fobs and USRP might want to take
some caution.  If you repeatedly press the keys while out of range of
your car, the rolling codes will lose synchronization and you won't be
able to open your car.

Here's a source that explains this, and says 256 is the typical limit:

http://auto.howstuffworks.com/remote-entry2.htm

TJ Dreier