Clear-Com RM-702 - Manual (Page 7)

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OPERATION
INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercom
s 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