Motorola MTR3000 Basic Service Manual

1-10 MTR3000 Base Station/Repeater: Theory of Operation
- Customer Programming Software (CPS)
- Tuner application
- Repeater Diagnostic and Control (RDAC) software
- Online Help
- Provides an Ethernet port for IP site connectivity and remote RDAC
- Provides GPIO connectivity for third party controller interfaces
- Provides for analog base station/repeater audio connectivity
- Data and Control to the Receiver via the SPI and SSI respectively
- Data and Control to the Exciter via the SPI and SSI respectively
- Control of the PA’s set power via the SPI
- Generates the internal station reference
- Provides control of the front panel status indicators.
• The PA Module amplifies the low level modulated RF signal from the Exciter module. It then
delivers the amplified signal to the transmitter antenna port at a power level within the rated
power band of the base station/repeater, for transmission to the subscriber radios. In addition
to its primary task of amplification, the PA provides the following hardware functions for the
base station/repeater.
- Harmonic attenuation
- Inter-modulation attenuation (IMA) suppression
- VSWR detection
- RF power control (primary means)
- Self contained cooling fan and control circuit
- Meters for diagnostics
- Power rollback for temperature, VSWR, and voltage
- Self-Contained calibration (no field alignment is needed for the PA Module).
• The PS Module provides DC power to the Receiver, Exciter, SCM and PA Module via one or
more of the three DC output taps; 28.6 VDC, 14.2 VDC, and 5.1 VDC. It can also be used to
provide auxiliary power (14 VDC) to a number of third party controllers. Additionally, it can
operate in three different input modes:
- AC Input Only
- DC Input Only
- AC with Battery Revert.
In addition to providing power to the noted FRU and controllers, the PS also provides the
following:
- AC Failure detect signaling to the SCM
- Output over-current protection for all three outputs
- Self contained cooling fan and control circuit (thermal shut down if the environmental
temperatures exceed the cooling capacity provided by the fan).
• Further details can be found in the individual “Theory of Operation” sections of the respective
FRU chapters.

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English