Browse Prior Art Database

A SCANNING REPEATER SYSTEM FOR SPECIAL RESPONSE TEAMS

IP.com Disclosure Number: IPCOM000006994D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-15
Document File: 3 page(s) / 143K

Publishing Venue

Motorola

Related People

John McCoy: AUTHOR [+3]

Abstract

A conventional repeater operates on a single, fixed frequency pair. A number of advantages can be gained in special situations by the use ofa transport- able repeater which scans several frequencies and assigns its transmit frequency based on the active receive hequency Such a repeater is described herein, together with a number ofpractical applications.

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MOTOROLA INC. Technical Developments Volume 20 October 1993

A SCANNING REPEATER SYSTEM FOR SPECIAL RESPONSE TEAMS

by John McCoy, Bill Parken and Scott Chuprun

INTRODUCTION

  A conventional repeater operates on a single, fixed frequency pair. A number of advantages can be gained in special situations by the use ofa transport- able repeater which scans several frequencies and assigns its transmit frequency based on the active receive hequency Such a repeater is described herein, together with a number ofpractical applications.

  A repeater station could be designed with a receiver similar to that in a mobile, which scanned among several receive frequencies. A repeater of this nature would require the further enhancement of the transmitter frequency being changed to follow the receive, such that when the repeater stopped scanning and received a signal, it was transmitted on the corresponding transmit frequency ofthat pair.

  Thus the repeater, when idle, would scan the several receive frequencies. Once a signal was detected, the repeater would remain fixed on that frequency pair, acting as conventional repeater, as long as the signal was present. Once the signal ended, the repeater would return to the idle, scanning state.

1. A SCANNING REPEATER

  In a traditional radio system, a repeater station operates on a fixed receive and transmit frequency pair. Ditferent sets of users would each have a seperate repeater, operating on seperate hequency pairs. A mobile radio, on the other hand, commonly has a number of frequency pairs, and scans among them, stopping and outputting audio on whichever might have a signal present.

2. APPLICATION: INTER-AGENCY COMMUNICATION

  A common problem faced by emergency per- sonnel responding to a call is inability to communi- cate between different agencies, such as police and fire departments. A transportable scanning repeater, might be contigured with two 6equencies pairs: police receive and fire transmit for one, and fire receive and police transmit for the other. Being transportable the repeater could be brought to the site of the emer- gency and rapidly set up. The repeater would then retransmit all the police traffic on the tire depart- ment frequency, and vice versa, allowing each personel to intercommunicate and coordinate activ- ity (as shown in Figure 1).

3. APPLICATION: TEMPORARY REPEATER SYSTEM FOR SEVERAL USERS

  On occasion, it is necessary to establish a tem- porary communications system for several discrete groups of users. Transportable scanning repeaters, with a suitable interconnect system, can simplify this task.

A repeater as described above, could be equipped

Figure 1: Cross agency application

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INC. Technical Developments Volume 20 October 1993

with an interface circuit to one or mo...