IBUC Operation Manual
Terrasat Communications, Inc.
Rev. A
7-21
Tx/Rx 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 inch 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 of the IBUC and PSU units is recommended to prevent
possible damage from lightning and/or other induced electrical surges. It is
recommended that 3/0 or 4/0 AWG (American Wire Gauge) stranded copper wire be
used to bond the IBUC and the PSU to the earth ground (grounding rod), using the most
direct (shortest) route.
SYSTEM ALIGNMENT and OPERATION
General
The sections below outline the procedure for setup and alignment of the earth station.
Prior to the ODU alignment, the antenna should be set to the desired azimuth and
elevation settings per manufacturer's instructions.
CAUTION: THE Tx Redundant System MUST NOT TRANSMIT UNTIL ALIGNMENT AND ANY
NECESSARY ADJUSTMENTS ARE COMPLETE.
Test Equipment
The following equipment or equivalent is recommended for installation and system
alignment:
Table 7-9 Recommended Test Equipment
Equipment Type
Spectrum Analyzer HP8563E
Digital Voltmeter Fluke 8050
Adapter Waveguide to coax C or Ku-band
RF cables With calibrated insertion loss up to 15GHz
40 dB attenuator High Power to match HPA output.
Assortment of cables, connectors and
adapters (calibrated up to 15 GHz)
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