Receiver Verification - Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual

Receiver Verification
Receiver Verification
The receiver verification procedure sends a known test signal to the Base Radio to verify the receive
path. This verification procedure is recommended after replacing a Base Radio.
Equipment Setup for Receiver Verification
To set up the equipment, use the following procedure.
Procedure 6-8 How to set up the Equipment for Receiver Verification
Connect one end of the Service cable to the service computer.
1
Connect the other end of the Service cable to the Service Access port located on the front panel
2
of the BR.
Disconnect the existing cables from the Base Radio TX and RX connectors (or the connector
3
corresponding to the receiver under test).
Connect a test cable to the TX and RX connectors.
4
Connect the other end of the test cable to the RF output on a TETRA Signal Generator.
5
Connect Frequency Standard 10 MHz OUTPUT to a 10 dB attenuator.
6
Connect other end of the attenuator to the 10 MHz REFERENCE OSCILLATOR IN/OUT
7
connector on the TETRA Signal Generator.
Connect the Trigger Output connector on the Service Port Cable to the External Trigger Input
8
on the TETRA Signal Generator.
Set the TETRA Signal Generator to EXT REF mode.
9
Set TETRA Signal Generator to ON.
10
Set the TETRA Signal Generator to the receive frequency of the Base Radio under test. (All
11
receivers within a single Base Radio have the same receive frequency.)
Configure the generator for a TCH 7.2 Tetra channel.
12
Set the TETRA Signal Generator to generate the test signal at an output level of -110 dBm.
13
6-26
The following procedure requires the Base Radio to be out of service. Unless the Base Radio
is currently out of service, Motorola recommends performing this procedure during off-peak
hours. This minimizes or eliminates disruption of service to system users.
In order to avoid the risk of causing a high bit error rate to occur, do not use 385.572MHz
and 419.175MHz as receiving frequencies in the Base Radios of the MTS.
Chapter 6: Configuration and Testing
6802800U74-N September 2009