Terrasat IBUC 3, Operation Manual

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7-14
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IBUC
3
, IBUC
3 G
Operations Manual: Transmit Redundant Systems
Engineered to Endure
Tx Redundancy/PSUI Grounding Recommendations
Grounding and lightning protection is recommended as follows.
• Cable Shielding
The shield currents can be eliminated with proper techniques. A grounding strap at
the end of the coaxial and data cables should be connected to the ground lug at the
antenna base with a #4 gauge copper wire. This provides a path of least resistance
prior to entering the electronic equipment.
• AC
The best way to protect the equipment is to have two protectors. The first is the
power mains protector that is mounted directly across the mains in the breaker box.
The second should be mounted or grounded directly at the base or hub of the
antenna or at the 19-in. rack.
• Data and Control Lines
The I/O lines can deliver surge current to the equipment and should be protected as
well.
• Electrical Grounding
Grounding the IBUC
3
, IBUC
3 G
and PSUI units is recommended to prevent
possible damage from lightning and/or other induced electrical surges. Terrasat
recommends that 3/0 or 4/0 AWG (American Wire Gauge) stranded copper wire
be used to bond the IBUC and the PSUI to the earth ground (grounding rod), using
the most direct (or shortest) route.
System Alignment and Operation
General
The following sections outline the procedure for setup and alignment of the earth
station. Prior to ODU alignment, the antenna should be set to the desired azimuth and
elevation settings per manufacturer's instructions.
!
CAUTION
The Transmit Redundant System must not transmit until alignment and
any necessary adjustments are complete.