5.9.5.7.1 How To Verify UHF Duplexer Isolation
5.9.5.7.1 How To Verify UHF Duplexer Isolation
Procedure Steps
1
Connect test equipment as shown in
2
Observe and note the level in dBm as shown on the service monitor.
3
Connect the test equipment to the duplexer as shown in
.
4
Observe and note the level in dBm as shown on the service monitor. (If no number is displayed, consider
isolation to be greater than 105 dB, which exceeds the specification.)
5
Subtract the absolute number noted in step 4 from the number noted in step 2. The difference should be
higher than 100 dB to meet specification for Isolation.
6
Repeat steps 1 through 5 for Low-Pass/High-Notch cavities with the following exceptions:
a. Set service monitor tor Rx or Tx frequency, whichever is
HIGHER
b. Connect service monitor to Low Pass duplexer input (cavity #1)
c. Connect terminator to cavity #6.
5.9.5.8 UHF Duplexer Post Tuning Checks
Procedure Steps
1
Make sure all notch adjustment lock nuts (6) are tight.
2
Make sure all pass adjustment lock nuts (6) are tight.
5.10 Testing the GTR 8000 Base Radio/GPW 8000
Receiver Performance with a Service Monitor for
Integrated Voice and Data
The service monitor is a tool used to test and measure the transmitter and receiver characteristics of the base radio.
The Service Monitor may be connected to a base radio to perform tests and measurements designed to determine
whether the equipment is operating within specifications.
The sections that follow contain procedures that are performed when you first set up your system and can also be
scheduled on a regular basis as part of the maintenance policies of your organization. Topics covered include:
•
5.10.1 Deviation Standards (Digital Operation), page 5-34
•
5.10.2 Monitoring the Power Supply Module, page 5-35
6871022P86-A - November 2012
5-33
Summary of Contents for GTR 8000
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