User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD ATSC System Set-up
Transmitter/Regenerative Translator Procedure
Instruction Manual, Rev. 2 124
Forward and Reflected Power Calibration of a Higher Power System
NOTE: If your system is a CU0TD/RD-1 thru CU0TD/RD-5, refer to the previous section
for the forward and reflected power calibration procedures.
Forward Power Calibration
1. Connect a calibrated coupler and average reading power meter to the output of
the DTV mask filter.
2. On the ALC Board (1315006), mounted in the Driver Drawer, set the Switch S1,
Auto/Manual ALC, to the Manual position - refer to Figure 64.
3. Adjust the Manual adjustment Pot (R62) for the desired output power level as
indicated on the average reading power meter.
4. In the Amplifier Drawer, on the Amplifier Control Board (1309822), adjust the
Forward Calibration Adjustment potentiometer (R8), for a reading of 100% on
the External Amplifier Forward Power screen, which can be viewed on the CX
drawer LCD.
5. On the ALC Board (1315006), mounted in the Driver Drawer, set the Switch S1,
Auto/Manual ALC, to the Auto position.
6. Adjust the ALC adjustment Pot (R75) for a reading of 100% on the External
Amplifier Forward Power screen, which can be viewed on the CX drawer LCD.
This completes the reflected power calibration adjustment.
Reflected Power Calibration
1. On the ALC Board (1315006), mounted in the Driver Drawer, adjust the ALC
adjustment potentiometer (R75) for a reading of 10% on the External Amplifier
Forward Power screen, which can be viewed on the CX drawer LCD.
2. Disconnect the load or the antenna connected to the system.
3. In the Amplifier Drawer, on the Amplifier Control Board (1309822), adjust the
Reflected Calibration Adjustment potentiometer (R26) for a reading of 10% on
the External Amplifier Reflected Forward Power screen, which can be viewed on
the CX drawer LCD.
4. Reconnect the load or the antenna to the system.
5. Adjust the ALC adjustment potentiometer (R75) for a reading of 100% on the
External Amplifier Forward Power screen, which can be viewed on the CX drawer
LCD. This completes the reflected power calibration adjustment.
R8 FWD CAL ADJ
R26 REFL CAL ADJ