ViaSat Series 8345, Installation Manual

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Chapter 2 - Installation
12. Attach assembled feed housing to support spars and loosely bolt in place using
1/4-20 x 1 1/4-inch bolt, washer, and nut, in eight places. See Figure 2-20. Make
sure that the feed rotates freely. Tighten all fasteners to finger tight. Then
tighten the nut on the screw an additional 2/3 turn, but no more than 1
additional turn.
13. Position orthomode transducer (OMT) against feed housing assembly, aligning
holes in orthomode transducer with four inside holes of feed horn. Bolt
orthomode transducer to feed horn using 6-32 x 5/8-pan head screw, in four
places. (See Figure 2-20.)
14. Install LNAs/LNBs (as applicable) to orthomode transducer using M4-x .7 pitch
x 14 mm (metric) bolt, washer, and nut. (See Figure 2-20.)
15. Attach coaxial cable to each LNA or LNB and secure with cable tie as shown in
Figure 2-20.
16. Make loop (approximately 5-inch radius) in both cables and braided shield.
Route coaxial cables and braided shield down along groove in support spar and
secure cables to support spar using cable ties equally spaced. Coaxial cables and
braided shield should be draped over outside edge of reflector and routed down
along the panel brace.
Figure 2-20. Installation of Feed Housing, OMT and LNAs/LNBs
42S199F
2-41