User's Manual

Innovator CHV400BTD ATSC Transmitter System Set Up Procedure
Technical Manual, Rev. 0 66
Figure 15: (A3) IF Pre-Corrector Board (1308796)
Set Up of the IF Precorrector Board in the System
Refer to Figure 15. Check that the Auto/Man switch S1 on the IF Pre-Corrector
Board is in the Automatic ALC position. This is the normal operating position for the
switch. The voltage at TP1 on the IF Pre-Corrector Board should be 1.0 VDC with
100% output power.
Refer to Figure 16. Check that the Auto/Man switch S1 on the ALC Board is in the
Automatic ALC position. (NOTE: The silkscreen is incorrect on Rev. A, B & C boards.
Auto position is with the bat to the left, toward J4.) Adjust R75 the ALC pot on the
ALC Board as needed to attain 100% output power. Switch to Manual Gain (Manual
ALC) and adjust the Manual Gain pot R62 for 100% output power. Switch the ALC
Board back to Automatic ALC.
Figure 16: (A5) ALC Board (1308570)
S1
AUTO/MAN
S1
AUTO/MAN
TP1
1.0VDC
J4
R75
ALC ADJ
R62
MAN ADJ
R38
OVERDRIVE
THRESHOLD