Ku-Band BUC systems
Page 4 of 18 12-50176-EN Issue 2, December 2010
General guidelines for installing single-BUC systems
TRF and LNB
A TRF may already be integrated as part of the antenna feed. In this case, the LNB is
mounted directly to the Rx port of the antenna feed; please check the manufacturer’s
specifications. If the antenna feed does not have an integrated TRF, a TRF must be
installed on the Rx port of the antenna feed, and then the LNB is mounted onto the TRF.
The LNB obtains the required +15 to +24 V DC power and, in certain cases the 10 MHz
reference signal, from a compatible L-Band modem. The modem is connected to the Rx
output connector of the LNB.
BUC
BUCs are supplied with W/G outputs and an optional pole or universal boom mounting
kit suitable for the Codan range of L/M/RBUCs. Contact your antenna manufacturer if
you have specific installation requirements.
It is recommended that BUCs are installed as close as possible to the antenna feed to
minimise losses.
BUCs with W/G output are usually connected to the antenna feed with flexible W/G.
Care should be taken to minimise stress on the flanges due to bends or twists. However,
if the W/G output of the BUC is attached to a rigid connection, ensure that there are no
undue stresses on the W/G section when the flange hardware is tightened. Tighten the
BUC mounting screws last.
IF cables
Use an IF coaxial cable to connect the modem Tx output to the BUC IF input. It is
recommended that you use the same type of cable to connect the modem Rx input to the
LNB.
CAUTION
Heavier BUCs may need to be mounted further down the boom to
minimise the mechanical leverage load on the antenna.
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