Instruction manual

RM-702 TWO-CHANNEL REMOTE STATION

1-1

OPERATION

INTRODUCTION

Congratulations on choosing this Clear-Com product. Clear-Com was

established in 1968 and remains the market leader in providing intercoms for

entertainment, educational, broadcast, and industrial applications. The

ruggedness and high build-quality of Clear-Com products defines the industry

standard. In fact, many of our original beltpacks and main stations are still in

daily use around the world.

THE CLEAR-COM CONCEPT

Clear-Com is a closed-circuit intercom system that consistently provides

high-clarity communication in high-noise and low-noise environments. A basic

system consists of a single- or multi-channel power supply or main station

connected to various single- or multi-channel remote stations, such as beltpacks

and loudspeaker stations.

Clear-Com manufactures a wide variety of both portable and fixed-installation

units. All are compatible with each other. Clear-Com intercom systems can also

interface with other communication systems and devices.

Clear-Com stations are interconnected with two-conductor, shielded

microphone cable, using 3-pin XLR connectors. One wire carries the DC power

from a main station or power supply to all remote stations, and the other wire

carries two-way (duplex) audio information. The shield acts as a common

ground. One termination (per channel) is needed throughout the intercom

network, and is usually located in the main station or power supply.

Clear-Com is a distributed amplifier system; each main and remote station

houses its own mic preamplifier, headset or speaker power amplifier, and

signaling circuitry. Low-impedance mic input lines and specially designed

circuitry make Clear-Com channels virtually immune to RFI and dimmer noise.

Clear-Com main stations, power supplies and certain remote stations have

auxiliary program inputs with local volume control, allowing an external audio

source to be fed to the intercom system.

Visual signal circuitry (call lights), a standard feature on most main and remote

stations, allows the user to attract the attention of operators who have removed

their headsets.

Depending on the type of main and remote stations selected (and assuming that

enough DC power is available) remote stations can be distributed along a mile of

wire. Remote stations bridge the intercom line at a very high impedance and

place a minimum load on the line. The audio level always remains constant, and

does not fluctuate as stations leave and join the network.