XSAT7080 X-Band Transceiver
Revision 0
Maintenance and Troubleshooting MN/XSAT7080.IOM
7–3
7.3.2 RF C
ONVERTER
M
ODULE
Synthesizer and IFLO Lock Detect Fault:
During normal operation, neither the Upconverter nor the Downconverter synthesizer or
IFLO should experience a Lock Detect fault.
•
If one or more of these functions is faulted the transceiver will not function
properly.
•
If a fault condition exists and an EXT REF is being used, check the connection to
the transceiver and make sure it is secure.
•
It may be necessary to remove the EXT REF if it is faulty.
•
If the fault still exists, contact Comtech EF Data Customer Support .
7.3.3 R
EFERENCE
O
SCILLATOR
M
ODULE
Reference Lock Detect:
A fault ("FT") indicates that the reference oscillator is not locked. Check all connections
to the converter module to make sure they are secure. If the fault still exists, contact
Comtech EF Data Customer Support.
7.3.4 LNA
C
URRENT
F
AULT
LNA Current Fault:
This can indicate either a problem in the XSAT LNA current source circuitry or a
problem with the LNA.
•
First, insure that the LNA is connected and that no shorts exist. Use the RMS?
Command to query the measured LNA current.
•
If the LNA and cable are OK, proceed to disconnect the LNA and measure from
the center conductor of the cable to the shield of the cable using a DVM. A
voltage of 12Vdc shall be measured if the LNA Current Source is Enable (i.e.
LCS=1).
•
Contact Comtech EF Data Customer Support for further troubleshooting
.
