Maintenance Procedures; Spare Amplifiers - Comtech EF Data XTRT-400C-BUC Operation And Installation Manual

Maintenance Procedures

Spare Amplifiers

To insure the working integrity and future availability of spare
amplifiers, Xicom Technology recommends that approximately six
months after delivery amplifiers are operated for a period of 30
minutes to one hour.
Use this procedure to test operate the spare amplifiers.
1 Inspect the test data provided with the amplifier and record the
2. Attach a suitable waveguide load to the amplifier RF output port.
3. Connect the appropriate line voltage to the amplifier power input
4. When the filament-time-delay is complete, turn on the high
5. Within 30 seconds after applying high voltage observe and record
6. Compare the reference helix current obtained from the amplifier
The above values provide general guidance for determining the
condition of a spare amplifier. A specific unit may exceed these
limits and still be operating satisfactorily. In particular, Ka-band and
Q-band amplifiers with inherently very low values of helix current
may show greater values at turn-on and in the first few minutes of
operation. If these limits are exceeded, or if any alarms or faults are
encountered when the high voltage is applied, Xicom Technology
Customer Service should be contacted for assistance. Contact
information is located in the chapter titled Overview.
MNC-0600-001
EAR EXPORT CONTROLLED: The information contained in this Manual refers or relates to a product that is subject
to the U.S. Export Administration Regulations (EAR). Transfer of data herein by any means to a Foreign Person,
whether in the U.S. or abroad, may require an export license from the U.S. Department of Commerce.
maximum value of helix current shown on the Small Signal Gain
versus Frequency plot. The dashed line represents the helix
current.
connector and turn on the AC power.
voltage.
the value of helix current shown on the front panel or remote
display. Continue to observe the helix current, recording the value
shown after 5, 15, and 30 minutes of operation.
test data with the observed values. The helix current immediately
after high voltage turn-on should be not greater than 2 times the
reference value. After 5 minutes of operation, the helix current
should not exceed 1.5 times the reference value. After 15 minutes
of operation the helix current should be stable and not exceed 1.3
times the reference value. After 30 minutes of operation the helix
current should not differ from the 15-minute value by more than
0.2 mA.
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Preventive Maintenance
Revision C