10/6/10 888-2629-200 5-17
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
i. Re-adjust the transmitter power output as required to reach licensed nominal
power. Be sure it is stable.
j. Disconnect the power meter probe form the Forward coupler port then reconnect
forward sample cable.
NOTE:
The detector voltage values are provided on the Sys Pwr Calibrate screen shown
in
Figure 5-8. They are in the column to the right labeleled Detector. The Sys
Fwd (kW) detector voltage level should be between 3.0 and 3.4V at full rated
power. Operating in this range insures measurement accuracy (in detector’s linear
region). If the detected levels are too high, attenuation will need to be added at
the coupler port to reduce the detected voltage level.
k. To access the Calibration screen press SYSTEM>SERVICE>SYSTEM
SETUP>CALIBRATE shown in Figure 5-8 on page 5-17.
Figure 5-8
System Power Meter Calibration Screen
l. Click on the corresponding window for System Fwd power, opening a numeric
entry box.
m. Enter the value (in kW) measured in step d. above.
n. Click on DONE to store the changes, or CANCEL to ignore all changes made
o. Press the Auto Power Power Control button to enable ALC.
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