Service Manual

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6802800U74-AN
Chapter 6: Configuration and Testing
6.5.4.3.1
Setting Up the Equipment for Receiver Verification
IMPORTANT: BR-Arch-1 Base Radios: To avoid the risk of causing a high bit error rate to
occur, do not use 385.572 MHz and 419.175 MHz as receiving frequencies in the Base Radios
of the MTS.
Procedure:
1 Connect one end of the Service cable to the service computer.
2 Connect the other end of the Service cable to the BR Service Access port on the front panel of
the BR.
3 Disconnect the existing cables from the Base Radio TX and RX connectors (or the connector
corresponding to the receiver under test).
4 Connect a test cable to the TX and RX connectors.
5 Connect the other end of the test cable to the RF output on a TETRA Signal Generator.
6 Connect 10MHz REF output from signal generator to "ext ref in" on the Service Port Cable.
7 Connect the Trigger Output connector on the Service Port Cable to the External Trigger Input on
the TETRA Signal Generator.
8 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 receivers within a single Base Radio have the same receive frequency.
11 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.
6.5.4.3.2
Verifying the Receiver
This procedure provides commands and responses to verify proper operation of the Base Radio
receiver path and is recommended after replacing a Base Radio. The Bit Error Rate (BER)
measurement meets specifications at less than 0.01% (1.0e-02%) to pass the process.
Prerequisites: Take the Base Radio out of service. Unless the Base Radio is currently out of service,
Motorola Solutions recommends performing this procedure during off-peak hours. This minimizes or
eliminates disruption of service to system users.
Procedure:
1 Switch the MTS on.
2 Enter the BR Test Application mode and login with dev credentials. See Logging on to the Test
Application on page 225.
NOTICE:
If the prompt does not show, wait for the BR to reboot automatically in less than 30 s.
Contact your local Motorola Solutions representative or Technical Support to obtain the
password.
3 At the prompt, type: freq -orxch1 and record the result.
4 Optional: If you need to change the TX or RX frequencies, enter the following commands:
freq -otx_all -f<X>
freq -orx_all -f<X>