MTR3000 Performance Check or Testing: Verifying Receiver Circuitry 12-5
12.3 Verifying Receiver Circuitry
12.3.1 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 Receiver circuitry.
This procedure allows the service technician to make minor adjustments and verify proper operation
of the base station/repeater receive circuitry, including:
• Receiver Module
• Station Control Module
In general, the Receiver circuitry is exercised by injecting and measuring signals using a Motorola
R2001 or R2600 Communications 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.
12.3.2 Required Test Equipment
The following test equipment is required to perform the procedure:
• Aeroflex 3900 Series Communications System Analyzer (or equivalent)
• Male N-type to Male N-type coaxial cable
• RJ-45 to BNC (6 feet) cable; part no. 3083191X02
• Service Speaker; part no. HSN1006
• Service Speaker adaptor cable; part no. 0185180U01
• Dummy Load (50 Ω, base station/repeater wattage or higher) required for base station/
repeaters only
Performing this procedure requires that the base station/
repeater be taken out of service. It is recommended that,
unless the base station/repeater is already out of service, this
procedure be performed during off-peak hours so as to
minimize the disruption of service to the system subscribers.
If the base station/repeater operates as a base station/
repeater, the transmit output from the base station/repeater
must be connected to a dummy load to prevent over-the-air
broadcast during Receiver testing.
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