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Maintenance
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6-3
Engineered to Endure
Power Supply Checks
Before beginning RF troubleshooting of DC-powered IBUCs, first verify that the
proper voltages are being supplied to the IBUC. Input DC voltage and IBUC current
consumption data are available from the IBUC M&C. Verify that the values are within
limits. If an M&C interface is not available, use a multimeter to verify that the
appropriate voltages (24 VDC or floating 48 VDC) are present at the IBUC. Check the
part number label on the IBUC to determine the required voltage. The IBUC DC
supply can be through either the J1 or J3 connector.
Transmit Power Setting
There have been several cases reported to Terrasat Technical Support where the
transmit power has been turned up to or near saturation while transmitting a digital
carrier. This most likely will result in spectral distortion, re-growth, and
intermodulation products for multi-carrier operation. To reduce saturation, reduce the
input level or increase the attenuation.
Note:
When transmitting digital carriers, it is customary to operate the power amplifier
system with an output back off (OBO) sufficient to meet the spectral density mask
requirements and interference requirements of multi-carrier operation.
Transmit Intermediate Frequency Input Level Verification
If low or no Tx output power is detected, begin troubleshooting by checking the input
to the IBUC.
1. Check the Tx Input Level displayed in M&C or disconnect the cable at the IBUC
J1 connector (Tx L-band) and use a spectrum analyzer to measure the power level
of the L-band signal at the output of the coaxial cable that connects to the IBUC at
J1 (Tx L-band). The L-band signal level should be within the range of -20 dBm
through
-
55 dBm. If it is not, check the cable and modem output.
2. If the L-band signal is within range, check that the 10 MHz reference signal is
within the range of +5 dBm through
-
12 dBm and is distortion free. If it is not,
check the cable and modem output.
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
!
WARNING
DC power might be present on the cable. Terrasat recommends the use
of a DC block.
Содержание IBUC 2
Страница 6: ...iv Engineered to Endure Appendix F Glossary Glossary of Terms F 1 ...
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Страница 46: ...System Components 2 26 Engineered to Endure Figure 2 10 DC Power IBUC System Configuration ...
Страница 57: ...General Requirements 3 9 Engineered to Endure Figure 3 2 IBUC 2 Field Installation ...
Страница 72: ...3 24 Cyber Hardened IBUC 2 IBUC 2e IBUC 2G IBUC R IBUC G Operations Manual Installation Engineered to Endure ...
Страница 102: ...6 10 Cyber Hardened IBUC 2 IBUC 2e IBUC 2G IBUC R IBUC G Operations Manual Troubleshooting Engineered to Endure ...
Страница 106: ...A 4 Cyber Hardened IBUC 2 IBUC 2e IBUC 2G IBUC R IBUC G Operations Manual Part Numbering Schema Engineered to Endure ...
Страница 128: ...B 22 Cyber Hardened IBUC 2 IBUC 2e IBUC 2G IBUC R IBUC G Operations Manual Embedded Web Pages Engineered to Endure ...
Страница 179: ...Reference Drawings D 3 Engineered to Endure Figure D 2 Fabrication Drawing FBD 21984 XXXX Rev B page 1 of 2 ...
Страница 181: ...Reference Drawings D 5 Engineered to Endure Figure D 4 Fabrication Drawing FBD 20606 XXXX Rev A ...
Страница 196: ...I n d e x 4 ...