Maintenance and Troubleshooting
6009-33 Broadband At Sea
7-11
7.4.
Troubleshooting
7.4.1.
RF Flow: Cross-Pol/Co-Pol switching and Quad Band LNBs
Your antenna system has hardware components installed onto it to allow the operator a choice of providing
either Co-Pol or Cross-Pol receive IF signal (in any of four frequency bands) to your satellite modem via the
Tracking Band selection (refer to Chapter 5 for detailed setup information on this parameter or Chapter to for
detailed operation information).
A Quad frequency band LNB is installed on the receive port of the feed assembly (OMT). Its’ IF output is
routed via coax to a 75 ohm coax switch assembly to provide Cross-Pol Receive IF to below decks when
selected. A second Quad frequency band LNB, installed onto the receive port of a WR-75 diplexer, located
within the TX waveguide path between the BUC and the TX port of the feed assembly. The IF output of this
LNB provides Co-Pol Receive IF to below decks when selected.
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