RFI APM1317 User Manual page 125

APMxxxx Series User's Manual
BTx Pwr:
This is the Base Tx Output Power that will be used to calculate Combiner Insertion Loss. It should indicate the Power Level
expected at the input of the Combiner.
You can either manually enter a value (if known) or use the Capture button to copy the current Reported Pwr value to this field.
Capture BTx Pwr:
Copies the Reported Pwr value to the BTx Pwr field.
Refresh:
Click this button to update the Reported Pwr status information with the most recent measurements.
Discard Changes:
Click this button to restore the values to those present when the page was last re-displayed.
Note that if invalid values are being displayed after an Apply attempt, these values may not match the current saved settings. In
this case, just click on the relevant "Calibration/Tx Port" menu item to re-display the current settings.
Apply:
This will attempt save and activate the values entered. If any out of range values are present, nothing will be saved and the
problem settings will be highlighted with a red background. If successfully saved, the Reported Pwr values are adjusted to
current values.
Note: Whenever programming changes are applied, the alarm status for affected channels is re-initialized.
RECOMMENDED CALIBRATION PROCEDURE
Calibration of the APM allows system parameters such as coupling
values, interconnecting cable losses and system feeder losses to
be programmed into the APM for optimum measurement accuracy.
Motorola has approved three methods of APM calibration;
•
Option 1 (preferred method) – utilizes high accuracy digital power meter as a reference.
•
Option 2 (alternate to Option 1) - also utilizes high accuracy digital power measurement.
•
Option 3 – utilizes a Service Monitor for APM calibration.
The first two options require an accurate power measurement device capable of measuring digital signals. The third
option requires a Service Monitor capable of generating a 0dBm RF output signal utilizing the modulation scheme of the
system being optimized. Test equipment requirements for each option are;
OPTION EQUIPMENT TYPE
1, 2 Digital Power Meter
50Ω Termination
1, 2, 3
3 Service Monitor
RF Cable for Svc
3
Monitor
TEST EQUIPMENT REQUIREMENTS
VENDOR AND MODEL #
(or equivalent)
R&S NRT-Z14
-
-
-
Asia Pacific | EMEA | Americas
COMMENTS
Capable of handling base station TX power
Capable of generating system modulation @ 0 dBm
With known insertion loss
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