Terrasat Rx 1+1, Руководство по эксплуатации

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Installing the Rx 1+1 System
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3-19
The caution symbol (shown at left) that is printed on the chassis indicates that VDC
may be present. In general, low-power units with positive or floating supply allow DC
power via coaxial cable. However, AC-powered units cannot be supplied via coaxial
cable.
Rx Input J4 and J5 Connectors
– The Rx input connectors are Type-N socket
connectors used to connect the IF at L-band from the LNBs to the Rx 1+1 interface
module. 50
Ω cables are supplied with the Rx 1+1 system. The Rx 1+1 interface
module uses these connectors to supply the LNBs with the 10 MHz reference signal
and VDC.
Rx Output J6 Connectors –
The Rx output connector is an Type-N socket connector
used to connect the IF at L-band to the modem. 50 Ω cables should be used to connect
to J6. The modem supplies the 10 MHz reference signal for the LNBs through this
connector.
Waveguide Switch Control Indicator J7
– This connectors sends commands to
physically move the waveguide switch from the A: side to the B side (and vice versa).
The indicator then returns a response to the interface module to indicate the position of
the switch.
DC-powered Rx 1+1 systems include a Y-cable that enables you to share the power
supply with the Tx 1+1 system. Pin assignments are listed in
Table 3.6 .
Waveguide Connections
The waveguide is a two-position, four-port switch of a type known as a “baseball
switch” because of the resemblance between a cross-section of the switch and the
stitching pattern on baseballs. These ports are connected to the LNBs, the antenna
Table 3.6
Pin Assignments for the Y-cable Connector
Y-cable J1 Y-cable J2 Y-cable J3
Pin Function Pin Function Pin Function
A VDC - A VDC -
B VDC - B VDC -
C VDC - C N/C A VDC -
D VDC + D N/C B VDC +
E VDC + E VDC +
F VDC + F VDC +