Professional Mobile Radio
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Professional Mobile Radio (also known as Private Mobile Radio (PMR) in the UK and Land Mobile Radio (LMR) in North America) are field radio communications systems which use portable, mobile, base station, and dispatch console radios and are based on such standards as TETRA and APCO 25 which are designed for dedicated use by specific organizations. Typical examples are the radio systems used by police forces and fire brigades. Key features of professional mobile radio systems include
- point to multi-point communications (as opposed to cell phones which are point to point communications)
- push to talk, release to listen - a single button press opens communication on a radio frequency channel
- large coverage areas
- closed user groups
- use of VHF or UHF fequency bands
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