Norsat O3b 20W BUC - Manual (Page 12)

The BUC has body and cover heat sinks with fins as well as a fan for air cooling. Therefore, to
achieve an optimal function of the BUC, it should be mounted upside down so that fins of the body
heat sink and the air opening of the fan are open to fresh air as shown in Fig. 7. Ensure that there
are no objects that obstruct the flow of fresh air into the fins of the body heat sink and the air
opening of the fan.
Figure 7. Air cooling fins and fan of Ka 20W BUC
4.3 CABLE INSTALLATION
The connections of 7020STC-O3b A or B must be done using a waveguide (output) and coaxial
cables (input). The length of cables must be adjusted depending on the installation. An
inappropriate choice of the interface waveguide or cable may result in either a reduction of output
power at the external unit or an excessive distortion of the signal.
Some guidelines to install the interface cables between the internal units (Power supply and
Modem) and the external unit (BUC) are as follows:
a) Make a plan with the minimal route to be followed by the cables. It is recommended that 2m
of additional cable is added for ease of maintenance.
b) Secure the cables at each end of the connection.
c) Ensure that the external connectors are waterproof as well as resistant to other agents.
4.4 WATERTIGHT SEALING UP OF CABLES AND CONNECTORS
a) The application of moisture-resistant tape over the connectors is always recommended in
outdoor installations to ensure appropriate waterproofing. The application procedure of this
tape is the following: Ensure that all the connectors are correctly tightened. Cut a piece of
moisture-resistant tape with the desired size and remove the protector plastic of the tape.
© 2014 Norsat International Inc. Page 12 of 25