Motorola MTR3000 Basic Service Manual

Chapter 12 MTR3000 Performance Check or Testing
12.1 General
The MTR3000 Base Station/Repeater (BR) meets published specifications through the
manufacturing process by utilizing high-accuracy laboratory-quality test equipment. The
recommended field service equipment approaches the accuracy of the manufacturing equipment
with few exceptions. This accuracy must be maintained in compliance with the equipment
manufacturer’s recommended calibration schedule.
12.2 Verifying Transmitter Circuitry
12.2.1 Introduction
While most module faults can be detected by running the base station/repeater diagnostics, the
following procedure provides a more traditional method of troubleshooting the transmitter circuitry.
This procedure allows the service technician to make minor adjustments and verify proper operation
of the base station/repeater transmit circuitry, including:
• Exciter Module
• Power Amplifier Module
• Power Supply Module
• Transmitter-related circuitry in the SCM
In general, the transmitter circuitry is exercised by injecting and measuring signals using a Aeroflex
3900 Series Communications System Analyzer (or equivalent). Incorrect measurement values
indicate a faulty module(s); measurement values within the acceptable range verify proper operation
of the above listed modules and circuitry.
12.2.2 Test Equipment
The following test equipment is required to perform the procedure:
• Aeroflex 3900 Series Communications System Analyzer (or equivalent)
• Microphone (GMMN4063)
• In-Line Wattmeter (Motorola Model S-1350 or equivalent)
• Dummy Load (50 Ω, base station/repeater wattage or higher)
Note
Although these radios function in digital and analog modes, all testing is done in analog
mode.
The base station/repeater needs to be taken out of service in
order to carry out performance testing procedures. Unless the
base station/repeater is already out of service, it is
recommended to perform the procedures during off-peak
hours in order to minimize disruption of service to the system
subscribers.

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English