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Chapter 1 - Intercoms—An Overview 3
intercom system at some point. They can range from as simple as a single pair of units
talking to one another, to a system in which 24 or more different portable units are
dynamically switched between conversations.
Figure 1.3
Wireless Intercom Examples
Wireless systems will vary tremendously worldwide, due to varying governmental radio
regulations. What is common in America may be illegal in Japan, and may be unsuitable,
for other reasons, in Germany. These units may be referred to by any of the types
mentioned above, but, again, the unifying feature is the freedom from a wire.
Accessories
The fourth and final category is “accessories”. We are giving accessories its own separate
category because of its importance. This book is addressing intercom systems. In all
likelihood, many of the systems you encounter will be an amalgam of the three types
mentioned above. Without “accessories” you cannot have a system, just a bunch of
equipment.
To connect a TW system to a matrix system, a converter is required to change the
combined talk and listen signal from the TW to separate talk and listen signals for the
matrix – a hybrid provides this conversion.
Mirror Image Pair
Telex TR-500
TR-300
TR-300 TR-300
TR-300
BTR-300
Base Station with
4 Remotes
ExtIntercomAuxAudio
1
3
4
2
PortableStation Connect
BTR-300
Talk
HeadsetControls
HeadsetControls
Volume
Power
Headset
PortableTransmit On
Gain
O/M
PushTwice to Latch
RadioCom
Transmit to
Base
Transmit to
Beltpacks