Abstract
For building Private Mobile Radio (PMR), analogous and digital trunked mobile radio systems are used today. Due to many advantages, trunked systems of digital mobile radio are gradually pushing out analogous trunked systems. Digital trunked systems are produced and built in the field, according to specific standards. The most famous and spread standards of the world are "EDACS", "TETRA", "APCO 25", "TETRAPOL" and "IDEN". A short description and characteristics of the above mentioned standards are given in the paper, as well as their comparative analysis.
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