Like a police officer’s handheld radio is able to transmit to another unit let’s say 10 miles away, and he’s able to do that with ease. How is this possible? How come handheld radios that we have access to can’t do that? I know this probably sounds dumb to most of ya’ll but
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My local police dept dispatches for 7 towns in the area. They have a network of 8 radio repeaters on towers, which covers the area well, even in places with no cell phone service. The towers are all high in the air on top of the mountains. You only need to be within line of sight of 1 to get through at which point the signal is blasted out of all of the transmitters on the network all at once.
All of the radios transmit on a different frequency than they receive on so the repeaters don’t interfere with the transmissions.
Checkout radioreference.com for more info. You can search your area for all the frequencies / licenses in use in your area.
As others have mentioned police have licenses for the frequencies they operate on, and are able to use more powerful transmitters than your standard UHF radio. They also use VHF frequencies here as the longer wavelength travels further, though not as well through buildings.
Aircraft radios can reach over a hundred miles depending on altitude, it’s all about line of sight and what’s in-between (clouds mountains buildings etc)
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