© 2020 Kymeta Corporation. All rights reserved.
14
10 April 2020
700-00064 revA Kymeta™ u7 terminal user manual — TRM-U7H and TRM-U7X configurations
9.1
Replace the BUC
1.
Unplug the TX cable and the BUC control cable from the BUC.
2.
Loosen the BUC support plate/ODU support plate screws.
3.
Loosen the diplexer/antenna screws.
4.
Detach the diplexer from the antenna WR-75 flange. Ensure you don't lose the O-ring between the diplexer and
the WR-75 flange.
5.
Detach the BUC from the diplexer.
6.
Detach the BUC from the BUC support plate.
7.
Attach the replacement BUC to the BUC support plate. Check the illustration below to determine the orientation
of the BUC support plate. Mount the plate toward the side of the BUC that has the
Power
and
RF In
ports.
Tighten fasteners in a cross pattern.
Tools:
Torque screwdriver with 0.2 N-m (2 in.-lb.) minimum rating
Hardware:
(1) BUC, (1) BUC support plate, (4) BHCS, M4 x 10
Torque:
1.47 N-m (13 in.-lb.)
8.
Attach the BUC to the diplexer.
9.
Loosely bolt the diplexer to the antenna WR-75 flange with four socket head cap screws. Ensure the O-ring is in
place, correctly aligned, and not pinched when installing the diplexer. Poor O-ring installation can degrade RF
performance.
Hardware:
(1) diplexer, (4) 6-32 × 1/2” socket head cap screw
Tools:
Torque screwdriver with a 1.47 N-m (13 in.-lb.) minimum rating, 7/64" bit with ball head and 3 in.
(minimum) extension
10. Loosely
attach the BUC to the support plate. Apply a small amount of Loctite (included in conversion kit) onto the
threads of the (4) 6-32 x 1/2" socket head cap screws.
Hardware:
(1) BUC support plate with the attached BUC, (4) BHCS, M4 × 12
Tools:
Torque screwdriver with 0.2 N-m (2 in.-lb.) minimum rating, metric hex bit with 2.5 mm ball head and 3 in.
(minimum) extension
Torque:
1.47 N-m (13 in.-lb.)
11.
Tighten the diplexer/antenna screws.
12.
Tighten the BUC support plate/ODU support plate screws.
13.
Tighten the ODU support plate/antenna screws.
14.
Reattach the TX cable and the BUC control cable to the BUC.
