Axcera CHV400BTD, Technical Manual, Page: 71 / 87

Innovator CHV400BTD ATSC Transmitter System Set Up Procedure
Technical Manual, Rev. 0 67
ALC Board Set-Up, Forward and Reflected Power Calibration for CHV200B
Systems
NOTE:
If your system is a CHV400B or higher power with one or more external
amplifier trays, refer to the next section for the forward and reflected power
calibration procedures.
Refer to Figure 16. Locate (A5) the ALC Board (1308570), in the preset the
Overdrive Threshold pot R38 full CW and set R62, Manual Adjust, and R75, ALC
Adjust, full CCW.
Switch S1 to Manual Gain, and increase the output power to 100% using R62.
Calibrate the system output power for 100% using R23, the Forward Calibration pot,
on the Output Detector Board. Refer to Figure 17.
Figure 17: (A7) Output Metering Detector Board (1313747)
R23
FORWARD
CAL ADJ
R7
REFLECTED
CAL ADJ