Electrical Design; Trunking Capability - Motorola MTR2000 T5544 Instruction / Field Service Manual

Description

Electrical Design

Trunking Capability

2
Transmitter Circuitry
The station transmitter circuitry is designed for continuous duty operation and may be oper-
ated at full rated power. Output power is continually monitored by an internal directional cou-
pler. The forward power voltage from the coupler feeds a power control loop which
continually adjusts and maintains the desired output power. All adjustments are electronic,
including deviation and output power.
Receiver Circuitry
The station receiver circuitry features multiple bandwidth (12.5kHz, 20kHz, 25kHz, and
30kHz) capability. Injection signals for the first and second mixers are generated by frequen-
cy synthesizer circuitry electronically controlled by the Station Control Module. All receive
signals (analog) are detected and digitized before being sent to the Station Control Module,
providing improved, consistent audio quality throughout the coverage area.
Station Control Module
The Station Control Module is microprocessor-based and features extensive use of ASIC and
digital signal processing technology. The module serves as the main controller for the station,
providing signal processing and operational control for the station modules.
Wireline Circuitry
The station wireline circuitry options provide a wide variety of telephone interfaces and con-
trol mechanisms such as Tone Control. Telephone line connections are easily made to the
wireline circuitry via connectors on the rear of the station.
When equipped for trunking capability, the station can operate in Motorola's Smartnet™ or
the most advanced wide-area trunking system – SmartZone. The station can operate as a re-
mote voice channel or control channel repeater. The station interfaces to a Trunking Central
Controller (TCC) which provides the call processing and channel assignment tasks.
68P81096E36-H
06/28/05