Harris Maxiva ULX - Calibrate Forward Cabinet Power:; Reflected Power Calibrate

5-18 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
5.8.1.2 Calibrate Forward Cabinet Power:
a. Repeat the entire above procedure using the internal transmitter Incident (for-
ward) sample (shown in Figure 5-9), entering the data in the corresponding PA
cabinet window shown in Figure 5-10 on page 5-22.
NOTE:
Be sure to enter the incident (forward) coupler’s offset into the power meter. Dif-
ferent couplers will have different coupling values.
Figure 5-9 Cabinet Coupler
5.8.2 Reflected Power Calibrate
This procedure establishes the values used to calculate the VSWR protection thresholds
for Foldback and Fault events. These values are based on the "Nominal Power Output"
value entered into the System Setup screen in Figure 3-22 on page 3-26.
• The foldback power level (based on system power) is calculated using a
VSWR = 1.4:1. The VSWR foldback level can be related to reflected power
using the following formula to calculate the reflected power factor:
Forward
Coupler
Coupler
Reflected