Telex FMR-70 - INTRODUCTION; WHAT IS A WIRELESS MICROPHONE?; WHAT FREQUENCY BAND DOES THE TELEX SYSTEM OPERATE IN?

INTRODUCTION
WHAT IS A WIRELESS MICROPHONE?
MICROPHONE _
This is an electro-acoustic transducer which
responds to sound waves and delivers essential¬
ly equivalent electrical waves. These electrical
waves are sent to the belt transmitter or hand¬
held unit.
TRANSMITTER _
The transmitter generates and amplifies an RF
(Radio Frequency) carrier signal, modulates
this carrier with the microphone signal, and
radiates the modulated RF carrier.
RECEIVER
The FM VHF receiver is tuned to the frequency
of the transmitter. The receiver picks up the
radiated RF signal from the transmitter through
the antenna and converts the RF signal into
audio voltages for use with PA, Line, Network,
etc. The receiver frequency must be matched to
the transmitter frequency.
Figure 1
Block Diagram of Typical Wireless Microphone System
WHAT FREQUENCY BAND DOES THE TELEX SYSTEM OPERATE IN?
The Telex systems feature single channel, crys¬
tal controlled transmitters and receivers operat¬
ing in the VHF Band between 150-216 MHz.
The FMR-70 operates on specific standard fre¬
quencies within the range of 150 to 216 MHz,
and is specifically designed to complement the
Telex Model WT-55 transmitter or the HT-200
series handheld transmitter.
The FMR-70 is also fuUy compatible with all
Telex Wireless Transmitters manufactured to
date. The system operates on a fixed frequency
which can be computer selected to provide "in¬
terference-free" operation. Over a dozen sys¬
tems can be operated in a single location
simultaneously.
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