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MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
3 If the base radio is not already in Service Mode, place in Service Mode, as follows:
a Click Change to Service Mode.
b At the confirmation screen, click OK.
The base radio halts activity in the current mode and switches operation to the requested
mode.
c Re-open the Test And Measurement Screen, as described in
4 Connect the service monitor to the base radio:
a Remove the N-Type connector from the Transmitter Antenna Port.
b Connect an N-to-N cable from the Transmitter Antenna Port to the T/R port of the service
monitor
c Make the following settings on the service analyzer:
•
Click Receiver (TX Test).
•
Enter the frequency to match that of the base radio TX channel selected.
•
Click INPUT PORT and set to T/R.
•
Click ATTEN and set to 20 dB.
•
Click DEMOD and set to P25.
•
Click IF BW and set to 12.5 kHz
•
Click RF GEN to turn OFF the Signal Generator Output.
d Click Options. Enable and make the following selections in the Spectrum Analyzer, EVM
Data, Power Meter, and Modulation Plot, as follows:
•
Expand the Power Meter and set to AR (Autorange). If necessary, change to 0. Press
R
. Verify that Cable Loss is 0. If cable loss is anticipated, expand the Power Meter
ETURN
and enter the cable loss factor.
•
Set the RF Error Meters to AR (Autorange).
•
Set the Modulation Meter to AR (Autorange).
5 Set up the test in CSS by selecting V.52 in the Pattern Type field.
6 Click Start Pattern Transmission.
The service monitor displays:
•
The test pattern on the modulation scope.
•
The amount of deviation of the carrier.
•
The modulation fidelity as a percentage.
•
The transmitters carrier frequency error.
194
step
2.
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Table of Contents
Troubleshooting
