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Maintenance
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6-3
Engineered to Endure
3. For DC-powered IBUCs, if the L-band and 10 MHz signals are good check that
the DC voltage level is within range. The DC voltage may be on the L
-
band IFL or
from a separate power supply for 16 watts Ku
-
band, 25 watts C
-
band, or 20 watts
X
-
band and lower power units. For higher power units, the DC voltage will be on
the DC cable that is connected to the IBUC DC Input (J3 connector). If it is not,
check the PSUI or modem power supply outputs and cables.
4. For DC-powered IBUCs, if the L-band, 10 MHz and DC voltage signals are within
range, continue with the IBUC Tx Output verification procedure that follows.
5. Disconnect the spectrum analyzer from the coaxial cable.
IBUC
3
Transmit 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 the IBUC M&C. Alternatively, you
can connect a waveguide-to-coaxial adapter and a 40 dB high-power attenuator to
the IBUC 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. RF power should be between rated power and no lower than 25 dB below rated
power. If it is not, the IBUC is defective and should be returned to the factory for
repair. Instructions for returning a unit for repair are on
4. If the IBUC Tx RF output measures within specification, ensure that the
waveguide, feedhorn, and antenna are properly aligned.
Common Problems
The following problems or occurrences have been noted during normal
troubleshooting.
Tx Output is Disabled
When the Tx Output is set to Disabled, the Tx Output level shown on the Sensor Tab
-
99.00 dBm. This is not an actual reading.
However, when conditions cause the automatic shut-off of the Tx Output signal, the
Tx Output is muted and the Tx Output level on the Sensor Tab shown on
reads
-
96.00 dBm.
Incorrect Frequency Settings
If the Satellite Network Operations Center (NOC) does not recognize your signal, see
for additional information.
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 ...