This edition aims to help readers understand and apply the changes brought on by integrated circuits, microprocessors, computers, digital technology and satellites. It integrates new technologies with basic information on many different land mobile radio systems, and gives solutions to prevent intermittent system failures. This work brings readers up to date with technologies such as computers, digitized voice, second generation trunking, second generation cellular, automatic vehicle location (including GPS), and satellites - and demonstrates how the technologies are used in land mobile radio systems.