RFI APM1317 User Manual page 131

APMxxxx Series User's Manual
OPTION 3 (if Option1 or 2 is not available)
Connect the service monitor to the "Combiner" port of the APM hybrid coupler and the 50Ω termination to the
1.
"Antenna" port of the coupler.
2. Set the generator to the correct modulation type for the channel being measured and adjust its output level for 0
dBm.
3. Enter 40.0 dB into both the Forward Coupling and Reverse Coupling fields on the GUI.
4. Enter 0 dB into the Antenna Feeder field.
Enter the signal level (generator setting minus cable loss) into the BTx Power field. For this example, that is 0dBm –
5.
0.6 dB = -0.6 dBm. This is the level present at the "Combiner" port of the hybrid coupler.
Note: Do not press the "CAPTURE" button to the right of the BTx Power level field.
6. The GUI should appear as follows:
Click the "Apply" button toward the upper right of the screen.
7.
Look at the "Reported Pwr - Fwd" field for the channel being used for calibration.
8.
"BTx Pwr" field. Click the "Apply" button each time a change is made to "Forward Coupling" value.
9.
10. At this point, disregard the reading in the "Reported Pwr - Rev" field.
11. Once the "Reported Pwr - Fwd" and "BTx Power" fields match, click the "Refresh" button a few times to confirm a
stable reading and then click the "Apply" button and make no further changes to the "Forward Coupling" value.
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