Written by one of the key developers PMR, this important reference provides comprehensive coverage of digital PMR system, including standard Apco 25, TETRA and ASTRO DIIS and proprietary systems, EDACS, iDEN, Mobitex II and TETRAPOL. You are provided with a comparison of the properties of conventional analogue and digital PMR new system to help support the decision to introduce new communications radio system. It also discusses alternatives for PMR, such as public cellular systems, and concludes with a look at the future of PMR through the year 2010.