Overview
24 Block Up Converter Systems 6700/6900 series User Guide
Systems using a combined RF waveguide/coaxial
switch (C-Band only)
In the receive path, a receive RF waveguide switch directs the
received RF from the receive port of the antenna feed to one of
the LNBs.
In the transmit path, an RF coaxial switch directs the
transmitted RF from the on-line BUC to the transmit port of
the antenna feed. The RF from the off-line BUC is directed to
an appropriately-rated termination. The combined RF
waveguide/coaxial switch is controlled by a single cable,
which is connected to the LNB Switch Control connector
on the redundancy controller. The BUC Switch Control
connector is not used. The redundancy controller
automatically detects the presence of a combined switch and
configures its monitoring accordingly.
The combined RF waveguide/coaxial switch combines
waveguide and coaxial switching in a single assembly. The
switch is an electrically operated, 4-port WR229 waveguide
transfer switch, which is mechanically integrated with a 4-port
coaxial transfer switch for transmit RF.
The LNBs are directly coupled to ports 1 and 3 of the
combined RF waveguide/coaxial switch. The switch is
coupled via port 2 to the WR229 receive port of the antenna.
A blanking plate normally protects port 4 from the weather.
Coaxial cable connects the BUCs to ports 1 and 3 of the
N-type switch. The transmit antenna feed connects to port 2 of
the switch. A load or power attenuator connects to port 4.
The redundancy controller verifies RF waveguide switching
by monitoring the tell-back contacts to the combined RF
waveguide/coaxial switch. If the tell-back contacts indicate an
abnormal condition, the LNB Switch LEDs on the control
panel of the redundancy controller illuminate red.
NOTE
In the combined RF waveguide/coaxial switch
installation, the BUC Switch LEDs on the
control panel of the redundancy controller will
not illuminate.
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