Mysterious frequencies jam signals in San Mateo neighborhood, frustrating residents

Martin Chan and other neighbors have experienced off radio frequencies that have jammed signals.
Martin Chan and other neighbors have experienced off radio frequencies that have jammed signals. Photo credit Tim Ryan/KCBS Radio

It’s a real 'Who done it?' in a San Mateo neighborhood, where for about a month scores of residents have reported a strange radio frequency jamming their garage door openers, car fobs and Wi-Fi signals.

"I came back from golfing and I couldn’t open my garage door," neighborhood resident Robert Cheung told KCBS Radio. "First thing I do is change all of the batteries on the remotes and the keypad and it still doesn’t work."

Resident Martin Chan explained it’s more than just the garage door opener as Wi-Fi and cell signals and car fobs also seem to be jammed by a powerful radio frequency.

"Like three in the morning I was still working on it," Chan said. "I ended up using my computer as a Wi-Fi hotspot because I needed to make sure that my kids could get online for school the following day."

Martin Chan's radio spectrum analyzer.
Martin Chan's radio spectrum analyzer. Photo credit Tim Ryan/KCBS Radio

From the chatter around the neighborhood, resident Mikki Coffino figured the interference is widespread, within about a quarter mile radius. "We could be looking at more than 200, 250 people or more being affected," she explained.

The interference issue has been reported to San Mateo Police, Congresswoman Jackie Speier, the FCC and many others.

Featured Image Photo Credit: Tim Ryan/KCBS Radio