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Wireless Intercom System
Introduction
The 3M Wireless Intercom System is designed for
high reliability, compactness, and ease of service. It
is designed to provide two-way, radio-frequency audio
communication in quick service drive-through
restaurants and convenience stores.
The system can be programmed to operate on any one
of 16 different channels to provide high-quality audio
performance and reduce the possibility of interference
between neighboring wireless systems.
System Components
The number of components in a system varies
depending on the system configuration. However, the
base station, headset, and battery charger are common
to all system configurations.
Base Station
The wall-mounted base station contains logic and
analog circuits and related system controls, a receiver
to receive signals transmitted from the headsets, and a
transmitter to transmit signals to the headsets.
Headset
The headset is a wireless, battery-powered, two-way
radio used by the operator to communicate with menu
sign customers and with other store personnel who are
wearing headsets. The microphone and earpiece
enable the operator to transmit and receive spoken
communication and alert tones.
Some models of the headset assembly have
field-replaceable components. These components are
detailed in Section 3 of this manual (Replacement
Parts and Service).
Battery Charger
The battery charger charges headset batteries in
approximately 1.5 to 3 hours. The charger is
available in 3-slot and 6-slot versions.
The battery charger has no field-replaceable
components other than the power supply.
Speaker and Microphone Assemblies
Standard (Non- -Duplex) Systems
The 5-Inch Speaker and Mic Assembly is
recommended for use in standard communication
systems. It consists of a 5-inch, weather-resistant,
E 3M 2003
March
Theory of Operation and Diagrams
eight-ohm cone speaker plus a special
weather-resistant dynamic microphone. It also
includes a mounting bracket for easy mounting in
menu signs, speaker posts and other applications.
Using this separate speaker and microphone ensures
maximum sound quality.
Duplex Systems
The 3.5-Inch Duplex Microphone and 5-Inch Duplex
Speaker Assembly are recommended for use in duplex
communication systems. The microphone is mounted
on a foam housing, which can be cut to the required
size. The speaker is mounted in a metal housing.
Interconnect Module
This optional module provides a convenient
connection point for equipment such as speakers,
microphones, vehicle detectors, and auxiliary
intercoms.
Cross-Lane Module
This module is a required component for dual-lane
duplex cross-lane communication systems. It enables
a single headset to operate two base stations.
Vehicle Alert System
The Wireless Intercom System is compatible with all
3M vehicle detectors and those of most other
manufacturers.
System Configurations
The system can be configured in one of five ways
depending on the number of menu signs at the facility
and the type of communication desired.
Single-Lane Standard Communication System
This system provides standard communication
(talk/listen) for facilities that have one menu sign. It
consists of one base station and one or more headsets
and battery chargers.
Dual-Lane Standard Communication System
This system provides standard communication
(talk/listen) for facilities that have two menu signs. It
consists of two independent systems - - one dedicated
to menu sign 1 and the other dedicated to menu sign
2. The headsets are programmed to work with one
system or the other and are labeled accordingly (1 or
2).
1-1