PMR Radio is a Service introduced in 1999 that allows us to enjoy a free radio service using small compact handheld radio's. It is available to small businesses and private users alike on a set of harmonised european channels. Unlike 4w CB power these handhelds are restricted to 500mw (1/2 W) ERP With a fixed aerial and cannot be used in conjunction with a Base aerial. It is intended for short range only. No licence is required.
When these frequencies are used in combination with a number of CTCSS or DCS tone codes, they can provide many channel combinations. Basically there are 38 sub channels on each of the 8 frequencies making a total of 304 channels.
Distance wise they can go from a few hundred yards in heavily built up areas to around 10 miles depending on the radio/terrain and in favorable conditions ie, high up with no obstructions. The Best Long Range known record is 535.8Km (333m) From Blyth (UK) to Almere (NL)