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Service and Maintenance
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7-27
Engineered to Endure
the DC cable that is connected to the IBUC J3 (DC Input) connector. If it is not,
check the PSUI outputs and cables.
4. If the L-band, 10 MHz, and DC voltage (for DC-powered IBUCs) signals are
good, proceed to the
Tx Redundancy Output Verification
5. Disconnect the spectrum analyzer from the coaxial cable.
Tx Redundancy Output Verification
This check assumes that the L-band, 10 MHz, and DC inputs (for DC-powered
IBUCs) are at the correct levels.
1. Tx Output level is monitored and displayed in any of the IBUC M&C interfaces.
Alternately, you may connect a waveguide-to-coaxial adapter and a 40 dB high-
power attenuator to the Tx waveguide output.
2. Measure the Tx RF output with the spectrum analyzer connected at the waveguide
output. Ensure that the cable loss of the cable being used for the measurement has
been taken into account.
3. The RF power should be between rated power and rated power –25 dB. If it is not,
the IBUC is defective and should be returned to the factory for repair. The Terrasat
Repair Policy on
has information about returning a defective unit to the
factory.
4. If the IBUC Tx RF output measures good, check the waveguide, feedhorn and
antenna for proper operation.
Common Problems
The following common problems or occurrences have been noted during normal
troubleshooting:
• Supply voltage at IBUC is low or missing
• 10 MHz reference at the IBUC is at the wrong level or missing
• 10 MHz phase noise does not meet the minimum requirements
• Antenna is misaligned
• Bad OMT and/or antenna
• Damaged cables
• Antenna on the wrong satellite
• Tx L-band input level is misadjusted or turned off
• Water in the IBUC due to no gasket in the waveguide or a hole in the feed window.
• Water in the coaxial connectors
• Incorrect frequency settings
Summary of Contents for IBUC 3
Page 8: ...vi Engineered to Endure ...
Page 12: ...viii Engineered to Endure ...
Page 14: ...x Engineered to Endure ...
Page 33: ...System Components 2 11 Engineered to Endure Figure 2 3 DC powered IBUC3 Block Diagram ...
Page 37: ...System Components 2 15 Engineered to Endure Figure 2 4 DC Low Power IBUC System Configuration ...
Page 40: ...2 18 IBUC 3 IBUC 3G Operations Manual Functional Description Engineered to Endure ...
Page 60: ...3 20 IBUC 3 IBUC 3G Operations Manual Installation Engineered to Endure ...
Page 90: ...6 8 IBUC 3 IBUC 3G Operations Manual Troubleshooting Engineered to Endure ...
Page 132: ...B 8 IBUC 3 IBUC 3G Operations Manual Using HyperTerminal Engineered to Endure ...
Page 157: ...Menu Options D 3 Engineered to Endure Figure D 3 Hand held Terminal Menu Tree ...
Page 162: ...D 8 IBUC 3 IBUC 3G Operations Manual Hand Held Terminal Menu Tree Engineered to Endure ...
Page 227: ...Data Sheets G 7 Engineered to Endure ...
Page 235: ...I n d e x 3 Engineered to Endure ...
Page 236: ...I n d e x 4 ...