User's Manual

Innovator CU0TD-1/CU0RD-1 – CU4TD/CU4RD Appendix A: System &
ATSC Transmitter/Regenerative Translator Drawers Drawings and Parts List
Instruction Manual, Rev. 0 A-4
reading of 100% on the External Amplifier Forward Power screen of the LCD display
mounted on the Driver Drawer.
Figure 18: (A5) Amplifier Control Board (1309822)
On the ALC Board (1308570), mounted in the Driver Drawer, set the Switch S1,
Auto/Manual ALC, to the Auto position. Adjust the ALC adjustment Pot, R75, for a reading
of 100% on the External Amplifier Forward Power screen of the LCD display mounted on
the Driver Drawer. This completes the forward power set up and calibration adjustments.
On the ALC Board (1308570), mounted in the Driver Drawer, adjust the ALC adjustment
Pot, R75, for a reading of 10% on the External Amplifier Forward Power screen of the LCD
display mounted on the Driver Drawer. Disconnect the load or the antenna connected to
the system. In the Amplifier Drawer, on the Amplifier Control Board (1309822), adjust
the Reflected Calibration Adjustment pot, R26, for a reading of 10% on the External
Amplifier Reflected Forward Power screen of the LCD display mounted on the Driver
Drawer. Reconnect the load or the antenna to the system. Adjust the ALC adjustment
Pot, R75, for a reading of 100% on the External Amplifier Forward Power screen of the
LCD display mounted on the Driver Drawer. This completes the reflected power
calibration adjustment.
6 MHz
-35 dB
-110 dB
3 MHz
6 MHz
Figure 19: Typical 6 MHz Digital Spectrum
R8 FWD CAL ADJ R26 REFL CAL ADJ