User's Manual

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Telex Model BTR-700 Base Station

Owners/Users Manual (Preliminary Information)

General Description

The Telex Model BTR-700 is a part of the RadioCom ™ wireless intercom

series providing all of the Base Station functions.

The BTR-700 Base Station is a four channel receive and a one channel

transmit unit operating within the 518-608 and 614-746 MHz range (TV

Channels 22 to 59). Each base transmitter operates on selected frequencies

in the lower half of the frequency range and the receivers operate on selected

frequencies in the upper half of the frequency range.

The transmit frequency is used to transmit voice and signals to all four

of the TR-700 portable (beltworn) units.

Each of the base station receive frequencies are used to receive

transmissions from each portable unit. Full Duplex (telephone type)

operation is used and any portable can talk to any other portable or, any or

all of the base receivers can be deselected allowing the mobiles to monitor

only. Independent receive channels can be enabled or disabled by front panel

pushbuttons. The presence or absence of a portable transmit is displayed on

the LCD Display.

Two independent 2 wire or 4 wire intercom units can be connected to the

base station. Each intercom has independent input and output level

adjustments.

An Auxiliary connector is provided for general audio use and also has input

and output level controls.

A local headset connector is provided with volume, microphone gain control

and a talk/mute switch.

A front panel readout on the base station indicates the frequency or channel

that is in current use. A separate menu is used to select one of several

pre-programmed frequency sets or each base can be programmed to special

frequencies by the user.

Summary of content (5 pages)

PAGE 1
Telex Model BTR-700 Base Station Owners/Users Manual (Preliminary Information) General Description The Telex Model BTR-700 is a part of the RadioCom ™ wireless intercom series providing all of the Base Station functions. The BTR-700 Base Station is a four channel receive and a one channel transmit unit operating within the 518-608 and 614-746 MHz range (TV Channels 22 to 59).
PAGE 2
BTR-700 Users Manual Page 2 The BTR-700 has a built-in 100 to 240 VAC 50/60 Hz power supply. Power is controlled by the ON/OFF front panel switch. Half (1/2) Wave antennas are supplied with the base station. These antennas are ground independent. Transmit (RF) power is switchable on the rear panel from 50mW (maximum) to 5 mW (minimum). The transmit power can also be turned off for use where several bases are required that only use one transmit frequency.
PAGE 3
BTR-700 Users Manual Page 3 Frequency Stability……………………0.005% Modulation Limiter……………………..Peak-Responding Compressor Audio Frequency Response………..200 Hz to 10 KHz Nominal. Microphone Input Level……………..7.75 mV for 40 KHz Deviation. Receiver: Frequency Range……………………. 614 to746 MHz. (within 3 TV Channels, 18 MHz Blocks) RF Channels, four, frequency agile, 25 KHz steps. Sensitivity………………………. 0.8 uV for 12 dB SINAD Squelch (internal)……………………Open at 20 dB SINAD. Modulation Acceptance………………40 KHz Nominal.
PAGE 4
BTR-700 Users Manual Page 4 FCC LICENSING The Telex BTR-700 Transmitter/Receiver is Type Accepted Under Federal Communications Commission Part 74. Licensing of Telex equipment is the User’s responsibility and licensibility depends on the user’s classification, user’s application, and frequency selected. Telex strongly urges the user to contact the appropriate telecommunications authority for any desired clarification.
PAGE 5
BTR-700 Users Manual Page 5 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ Mandatory Safety Instructions to Base Station Installers and Users 1. Use only manufacturer or dealer supplied antenna. Antenna minimum safe distance, as calculated from FCC requirements, is 4.8cm. However, the FCC default for the minimum safe distance is 20cm. Antenna gain: zero dBd referenced to a dipole. 2.