10/6/10 888-2629-200 5-19
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
To determine the Nominal Output factor:
Foldback Power = Nominal Power Output x 0.0278
System Foldback Power = Nominal Power Output x Reflected Power Factor factor
• The system fault threshold level (based on System reflected power level) can
be set by the user. Setting the fault threshold level is done by entering a trip
voltage level in the Sys Reflected window on the Threshold Setting screen.
The voltage entered here should correspond to the detected voltage level that
is indicated when calibrating the system reflected power as described in
5.8.2.1 Calibrate Reflected Total Power
• The cabinet fault threshold is set to a VSWR = 1.9:1 at the factory and is not
adjustable by the user. A 1.9:1 VSWR corresponds to 9.63% reflected
power.
NOTE:
The cabinet fault threshold is set to 1.9:1 at the factory. Contact Harris service if
these values need to be changed.
5.8.2.1 Calibrate Reflected Total Power
NOTE:
Before attempting reflected calibration Forward calibration must be verified.
a. Turn on and adjust Maxiva Series transmitter to 100% rated average peak power
according to the bar graph.
b. Press SYSTEM>SERVICE>SYSTEM SETUP>CALIBRATE to view the GUI
screen shown in
Figure 5-8 on page 5-17.
c. Press Disable VSWR.
d. Remove the sample cable from the external Forward directional coupler (see
Figure 5-7, above).
e. Remove the sample cable from the external Reflected directional coupler. If there
is an attenuator on the reflected coupler port, keep it with the reflected sample
cable. Attach the reflected cable and a 10 dB pad to the external forward
directional coupler. If there is a pad already in place on the forward directional
coupler port, keep it with the forward sample cable.
2
1
1
⎟
⎠
⎞
⎜
⎝
⎛
+
−
VSWR
VSWR
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