Removal and replacement of ADU modules
98-133966-G1
Chapter 8: Service & maintenance
8-89
8888
Service & maintenance
8.5.16
Replacing the Ortho Mode Transducer
(OMT)
The OMT interfaces a low-loss waveguide from the dual-polarized feed-
horn to the BUC/LNB.
The purpose of the OMT is to separate the TX and RX signals and provide
isolation between BUC and LNB. DC power, 10 MHz external reference
signal and a 22 kHz control signal is delivered via the IF cable. The OMT
uses the independency of the signals to split and provide isolation. The
OMT also detects the output power and temperature of the BUC.
8.5.16.1
Removing the OMT
1. Follow the instructions in
Removing the Polarisation Unit
2. Follow the instruction in
remove both Co-pol LNB (to the left) and X-pol LNB (to the right).
Figure 8-121: Ortho Mode Transducer (OMT)
Tools needed:
• 4 x 150 mm Allen key
(located inside the service
door of the ADU)
• Torx20 screw driver
SAILOR900TM.book Page 89 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
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