I know someone who lives in Bremerton, WA. Every so often lots of garage door openers and car keyless entry systems and key fobs intermittently stop working for a few hours and this can go on for weeks.
It correlates with aircraft carriers coming to the Bremerton naval shipyard for repair work.
The 315 MHz band for unlicensed low power civilian devices overlaps with several military bands, and the military users have priority (i.e., if they interfere with civilians it is the civilians' problem, and if civilians interfere with the military it is the civilians's problem).
In particular a band used for air-to-ground aircraft communications includes the 315 MHz band. Apparently when a carrier is at the shipyard for repairs they take advantage of that opportunity to test and tune up the radio systems.
They also have radar that uses frequencies in the 315 MHz band. There was an incident in the news in 1999 when the USS Carl Vinson visited Hobart, Australia and disabled nearly every garage door opener within about 10 km of the port while is was pulling in and docking. It was fine once docked because they don't need the radar when not underway.
It correlates with aircraft carriers coming to the Bremerton naval shipyard for repair work.
The 315 MHz band for unlicensed low power civilian devices overlaps with several military bands, and the military users have priority (i.e., if they interfere with civilians it is the civilians' problem, and if civilians interfere with the military it is the civilians's problem).
In particular a band used for air-to-ground aircraft communications includes the 315 MHz band. Apparently when a carrier is at the shipyard for repairs they take advantage of that opportunity to test and tune up the radio systems.
They also have radar that uses frequencies in the 315 MHz band. There was an incident in the news in 1999 when the USS Carl Vinson visited Hobart, Australia and disabled nearly every garage door opener within about 10 km of the port while is was pulling in and docking. It was fine once docked because they don't need the radar when not underway.