Yet another reason I'm thankful I no longer live in a "metropolitan" area.
It would be terrible if somebody were to get some cheap Chinese radios and set them to transmit on those encrypted frequencies and just flew them around the repeater sites on drones. No way to take them out. No way to know who's responsible. And the entire region's law enforcement communications infrastructure is disabled for hours at a time.
I would hate for any terrible criminals to engage in such piracy because I'd like to save that trick for SHTF. No need alerting authorities to the strategy and letting them have time to prepare a defense.
I was thinking such a nefarious person could park the drone and only use flight to move it every so often to prevent transmitter hunting. With an hour of flight time in the drone you could move every 10 or 15 minutes and jam for a day or more if conditions are right. Long enough to power up another drone and send it in as a replacement when the first one's battery gets low. Shit, if you're good you might be able to rig the drone to attach to the repeater tower itself. Broadcasting at 1W from only 10 feet away would be like a 100kW transmitter a 1/2-mile away. You'd easily overpower all those 5-50W handheld and mobile units.
Unless you're in an area that demands special frequencies (mountain regions sometimes use 30MHz still,) most of the state will use the same system. For example, most of the state of Ohio uses a system called MARCS, a trunked, multi-agency comms system.
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