Motorola P Series Verkaufshandbuch - Seite 33

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Detailed Features/Benefits Description

3.4.7

Repeater Talkaround

You may have customers who need to extend their communications coverage. This may be

necessary to communicate over distances beyond the "back-to-back" range of the P Series radios,

or to eliminate a communications "blind spot" created by a hill or large building. The communication

requirements of such a customer can be fulÞlled by employing a repeater.

To better understand the requirement for Repeater Talkaround, consider the following typical

customer scenario :

Consider a dockyard where Worker A needs to communicate with Worker B. A repeater is

necessary to overcome the blind spot created by a large warehouse. This situation is described

below in Figure 2-1.

When Worker A presses the PTT, the radio transmits on frequency F1. The repeater receives

Worker A's communication on frequency F1 and re-transmits it on frequency F2. The radio being

used by Worker B receives the call on frequency F2. Similarly, when Worker B replies on F1, the

repeater re-transmits on F2 for Worker A to receive.

In summary, all radios using the repeater transmit on frequency F1 and receive on frequency F2.

This mode of communication is often called "semi-duplex".

Worker A

However, if the repeater is taken ofßine for maintenance or a group of workers moves outside the

repeater coverage area, communications can no longer continue using different transmit and receive

frequencies (ie. if Worker A transmits on F1, the call will be missed because Worker B is listening on

F2). Repeater Talkaround provides a simple solution to this problem.

Figure 2-1 Repeater Operation

Worker B

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