There’s a Chicago Tribune article reporting that in Colorado the Air Force is jamming garage doors. In a joint U.S.-Canadian operation, they were testing communications on a frequency that would be used by first responders in the event of a threat to homeland security. The 21st Space Command based in Cheyenne Mountain is conducting the tests.
From the article:
“But the frequency also controls an estimated 50 million garage door openers, and hundreds of residents in the area found that theirs had suddenly stopped working… Technically, the Air Force has the right to the frequency, which it began using nearly three years ago at some bases. Signals have previously interfered with garage doors near bases in Florida, Maryland, and Pennsylvania.”
I’ve always believed that eventually, somebody (maybe TV sitcom Home Improvement’s Tim Allen) would put a garage door opener in orbit, and have it cycle through every code. It’s the ultimate geek prank. In this case, the stronger Air Force transmitter signal is “swamping” the garage door receivers so that they can’t hear the weaker signal from the remotes, just like local radio stations drown out distant ones, but when they go off-air you can hear the distant stations.