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Performing Tests
TX Test Port Calibration Test
Chapter 4
77
Performing Tests
TX Test Port Calibration Test
This utility measures the loss associated with testing from the Base Station TX Test
Port. This provides to the Test Software a coupling factor to use with measurements
from the TX Test Port.
At the start of the test, the Test Software will prompt you to choose either full or
specified calibration.
• Full calibration will first measure the level at the Base Station TX Antenna Port,
then measure the level at the Base Station TX Test Port. The difference in these
levels is used to determine the loss through the TX Test Port.
If automated control of the Base Station is enabled, the Test Software will send
commands to the MSC during the test (see “Base Station Configuration” on page 41).
If manual Base Station control is used, 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 proceeding, it 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.
• Specified calibration will use the Specified Output Power level from the Base Station
Configuration Menu screen to determine the coupling factor. If the correct output
level is specified, the level at the Base Station TX Test Port will be measured and the
difference in these levels used to determine the loss through the TX Test Port.
Unless you are certain that the Specified Output Power level is correct (± 0.5 dB), you
should use the full calibration for the most accurate results.
Parameters and Specifications Used
The following specifications and parameters are used when running this test. See
Chapter 5, “Reference,” for descriptions of the specifications and parameters.
Parameters:
• 19. TX Antenna Port Cable Loss
• 21. TX Test Port Cable Loss
Specifications (Pass/Fail Limits):
• None used for this test.