Motorola PR400 manual Introduction, Conventional Radio Systems, Trunked Radio Systems

INTRODUCTION

Your PR400™ radio can operate on both LTR® trunked and conventional radio systems. This radio combines the very latest in two-way technology while delivering outstanding functionality at the touch of a button.

CONVENTIONAL RADIO SYSTEMS

Conventional typically refers to radio-to-radio communications through a single channel. Conventional systems also allow radio users to extend communication coverage by relaying their messages through a repeater. To ensure coordinated use by multiple users, each radio user must monitor the channel or repeater before transmitting to verify that the system is not currently busy.

TRUNKED RADIO SYSTEMS

A trunked radio system allows a large number of users to share a relatively small number of frequencies or repeaters without interfering with each other. The airtime of all the repeaters in a trunked system is pooled, which maximizes the amount of airtime available to

any one radio and minimizes channel/ talkgroup congestion.

Some of the benefits of trunked two-way radio systems are:

•No channel/talkgroup monitoring required prior to transmission

•Improved system access

•Automatic channel/talkgroup selection

•Increased privacy among members of the same group

LTR Trunked Systems

LTR (Logic Trunked Radio) is a transmission- based trunking protocol developed by the E. F. Johnson Company for primarily single-site trunking applications. In transmission trunking, a repeater is used for only the duration of a single transmission. Once a transmission is completed, that repeater becomes available to other users. This means that a conversation comprised of many transmissions may occur over several different channels/talkgroups within the LTR system. This method of trunking provides system efficiency by making repeaters available to all users after every transmission.

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INTRODUCTION

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