IBUC Operation Manual
Terrasat Communications Inc.
Rev. A
4-14
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 IBUC 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 4-9 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)
Ensure that the IBUC TX output power is disabled to prevent accidental transmission
interference with adjacent satellites or transponders before attempting to align or
performing any other operation involving the ODU. Before attempting any system
change, carefully evaluate the possible effects of the transmitted signal.
Setting the TX and RX Frequencies
All transmit and receive frequencies are set in the modem.
For a direct connection to an L-band modem follow the manufacturer’s instructions on
setting the transmit and receive frequencies.
Receive L-band Output Measurements
To check the Receiver, perform the following:
- Ensure that 15-24VDC (LNB Bias) is present at the modem or IFU RX input.
- Use a spectrum analyzer to ensure that the10MHz signal is present at the modem or
IFU RX input.
Warning; DC power will be present on the cable so the use of a DC block is
recommended.
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