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Performing Tests
TX Test Port Coupling Measurements
Chapter 4
O:\Manuals\E6385A_Amps\Book\perftst.fm
88
TX Test Port Coupling Measurements
This utility measures the loss associated with testing from a Base Station TX Test Port.
This provides to the Test Software a coupling factor to use with measurements from that
Base Station TX Test Port. Repeat this measurement for each test port to be used at the
cell site.
At the start of the test, you must full or partial calibration.
•In Full calibration, the Test Software first measures the level at the Base Station TX
Antenna Port, then the level at the Base Station TX Test Port. It uses the difference
between these levels to determine the loss through the TX Test Port.
If you have connected and configured a PC for automated control of the Base Station,
the Test Software will send commands to the MSC during the test. If you wish to use
manual Base Station control, you must disable call processing and turn off any
transmitters prior to connecting the Test Set to the Base Station TX Antenna Port.
NOTE During full calibration, the Test Software will prompt you to connect the Test Set RF
IN/OUT port to the Base Station TX Antenna Port using the TX Antenna Port cable.
After you have done so, the Test Software will prompt you to connect the Test Set
ANT IN port to the Base Station TX Test Port using the TX Test Port cable.
For accurate TX Test port calibration, you must use the correct cables when
prompted.
•In Partial calibration, the Test Software will use a Reference Power Level (that you
must enter) to determine the coupling factor. This is the level out of the Antenna
Interface Frame that feeds the foam jumper to the transmit antenna. The Test
Software then measures the level at the Base Station TX Test Port is measured and
uses the difference in these levels is used to determine the loss through the TX Test
Port.
Unless you are certain that the Reference Power Level that you enter is correct (± 0.5
dB), you should use the full calibration for the most accurate results.
Parameters and Specifications Used
The following parameters and specifications are used when running this test. See
Chapter 5, “Reference,” on page 95 for descriptions of the parameters and specifications.
Parameters:
• 21. TX Antenna Port Cable Loss
• 30. TX Test Port Cable Loss
Specifications (Pass/Fail Limits):
• None used for this test.