Andrew 3.7-Meter Earth Station Antenna manual Subreflector Adjustment Step

Subreflector Adjustment

Step 1

Step 2

Step 3

Step 4

Step 5

After the subreflector assembly has been attached to the reflector, the subreflector must be adjusted to ensure correct alignment. The following steps provide the procedure for adjusting the subreflector.

Position the supplied setting bar (P/N 203896 Ku-band, P/N 203896-3 C-band) ) on the outer edge of the subreflector as well as on the outer edge of the front ring (P/N 202790) at the twelve o’clock (top) position.

Sweep the bar across the corresponding subreflector edge, and note the relative posi- tion.

Repeat this procedure at the six o’clock (bottom) position.

Use the noted position to indicate the required directional movement of the top portion of the subreflector aperture, which is relative to the aperture bottom using the subreflec- tor stud-adjustment hardware (3 places) as shown in Figure 3-55.

Figure 3-55: Subreflector Alignment

Repeat Steps 1-4 at the three o’clock and the nine o’clock positions to indicate the prop- er aperture side adjustment.

68 Installation Procedures