Clear-Com SB-704 - Manual (Page 7)

S B - 7 0 4 M A I N S T A T I O N 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.
We recommend that you read through this manual completely to better
understand the functions of the SB-704. If you encounter a situation or have a
question that this manual does not address, contact your dealer or call
Clear-Com directly. Our applications support and service people are standing
by to assist you. (Refer to Chapter 5,“Warranty” for contact information.)
Thank you for selecting Clear-Com for your communications needs.
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 is a distributed amplifier system; each main and remote station
houses its own mic preamplifier, headset or speaker power amplifier, and
signaling circuitry. 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.
Low-impedance mic input lines and specially designed circuitry make
Clear-Com channels virtually immune to RFI and dimmer noise.
Clear-Com stations are interconnected with two-conductor, shielded
microphone cable. Portable stations are connected with two conductor cables
with 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 2-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.