5-20 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
NOTE:
The detector level should be approximately 2V when the reflected cable is
attached to the forward port with a 10 dB pad. If the reflected detector voltage is
too high when attached to the forward port with a 10 dB pad then additional pads
must be added to get the voltage in the 2V range. These newly added pads will
stay with the reflected cable when it is moved back to the reflected port later in
the procedure. The 10 dB pad will be removed when the reflected cable is placed
back on the reflected port
f. Click on the corresponding window for Sys Refld power, opening a numeric
entry box.
g. Enter the value that is 10% of licensed nominal output power.
h. Click on DONE to store the changes, or CANCEL to ignore all changes made.
Record the reflected detector voltage for later use in setting thresholds.
NOTE:
At this time the VSWR protection could be verified by pressing the Enable
VSWR button CALIBRATE screen. The transmitter should fault off.
i. Remove the 10 dB pad and return the reflected cable to the reflected port on the
coupler. Reconnect the forward cable to the forward coupler port.
j. Turn on the transmitter and adjust Maxiva ULX Series transmitter to licensed
nominal output power
5.8.2.2 Calibrate Reflected Cabinet Power
a. Repeat the entire above procedure using the internal (cabinet) Incident and
Reflected coupler samples (see Figure 5-9 on page 5-18) to calibrate the reflected
power at the cabinet output.
NOTE:
The detector level should be approximately 2V when the reflected cable is
attached to the forward port with a 10 dB pad. If there are pads on the forward
port to start with they should not be included with the added 10dB pad.
NOTE:
Enter the 10% of forward cabinet power value in the window for Cab Refld
(W). The reflected power trip point (1.9:1 VSWR) is set at the factory and not
adjustable in the field.
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