Andrew 9.3-Meter ESA manual Subreflector Offset Tilt Adjustment Step

Subreflector

Offset Tilt

Adjustment

Step 1

Step 2

Step 3

Step 4

Step 5

Refer to Table 4 and Figure 43. Adjust top subreflector jam nuts (two) the distance indi- cated according to the offset pointing angle in Table 4. Make the desired adjustment using the floating ring and subreflector jam nuts.

Note: Before making any adjustment, mark the starting position of the jam nuts in rela- tion to the floating ring with a pencil, then mark the floating ring to indicate the proper distance of the turn.

	Table 4
Offset Operating Angle	Top Stud Nut Adjustment
10° - 20°	1-3/4 turns
30°	1-5/8 turns
40°	1-1/2 turns
50°	1 turn
60°	7/8 turn

Table 4 shows the distance the subreflector must be lowered. Use only the top adjust- ment stud to obtain the proper offset tilt.

Once the offset tilt adjustment is completed, do not disturb adjustments.

Match mark the subreflector subassembly and the floating ring. Remove 3/4” (19 mm) jam nuts and washers and lower the subreflector subassembly. Place subreflector subassem- bly in safe location to secure it from damage during reflector/backstructure installation.

Remove theodolite and theodolite mounting assembly from feed support tube.

Figure 43

46 Installation Procedures