Terrasat Rx 1+1, Operation Manual

Page: 43 / 174

Installing the Rx 1+1 System
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3-7
antenna. The second rod should be placed towards the equipment enclosure. A #2
gauge wire should connect the rods and antenna mount. A ground rod should be placed
at the equipment enclosure as well. If it is virtually impossible to install the ground
rods, then radials are needed. This can be accomplished by laying 10 or more lengths
of 1½ in. (3.81 cm) copper strap, at least 50 ft (15.24 m) long, in a radial fashion
around the antenna base. The straps should be buried, if possible. The hub must be
interconnected to the utility ground.
The ground configuration can vary from one location to another. It is best to measure
the soil conductivity and design a 5
Ω or less ground system. To protect the system
from a direct strike, a lightning rod placed 2 ft (61 cm) higher than the highest point of
the dish should be interconnected to the Ufer ground with #2 gauge copper wire.
Cable and Waveguide Connections
When installing the cable and waveguide assemblies, ensure that all connections are
weather tight. If a Tx reject filter is being used, attach it to the input waveguide switch.
Use proper gasketing methods to prevent the entry of water.
The Rx 1+1 system uses a four-port rectangular waveguide switch. In the Rx path, the
received RF signal is directed from the antenna port to one of the two LNBs. Any RF
from the offline LNB is directed to a termination. The switch can either be controlled
and tested by using the
Rx Configuration Tab of the embedded Web pages or the
switch can be controlled manually.
When installing the waveguide switch, ensure that the switch positions are set
correctly. The are two possible switch position combinations: 1:2 and 3:4 or 1:4 and
3:2. For Position A on most Terrasat Rx 1+1 systems, Port 1 is coupled to the A: side
LNB, Port 2 connects to the antenna, Port 3 is coupled to the B: side LNB, and Port 4
is coupled to a termination. This is illustrated in
Figure F.3 on page F-4 .
Note:
For some Rx 1+1 systems, the ports have different couplings. In Position A of these
units, Port 1 is coupled to a termination, Port 2 is coupled with the B: side LNB, Port 3
is connected to the antenna, and Port 4 is coupled to the A: side LNB. This is
illustrated in
Figure F.3 on page F-4 .
WARNING
Ensure that all power is disconnected prior
to making any connections.