TECHNICAL NOTE – OPERATION OF MT4400 TWTA
08/10/2004
TN4400-3
MCL, INC.
34 of 36
12. If the system reaches maximum gain before reaching rated output power, slowly increase
the exciter output until the system reaches rated output power.
Under no circumstances should the TWTA be driven to an output of
greater than the system’s rated output. This will result in degradation or
permanent damage to the TWT.
13. Once the exciter output has been set so that the system reaches full rated output with the
MT4400 gain control set to maximum gain, the exciter output should be locked in place
by mechanical means or by way of a tamper proof seal. The MT4400 gain control should
then be used in the future to make adjustments to the system output power.
14. Allow the system to thoroughly stabilize for no less than 5 hours.
15. If it is desired to have the system recycle into Transmit after transient tube faults, or if the
system is to be left in unattended operations, see the “Tube Fault Counter Operation,”
paragraph of this document.
This completes the procedure necessary to bring the MT4400 TWT amplifier system into full
and complete system operation. The MT4400 TWTA transmitter system is now fully
operational and will stay functional until either operator shutdown or a fault condition is
detected.
If problems occur during the execution of this procedure, refer to TN4400-6 – Technical Note,
Troubleshooting & Customer Service Guide for MT4400.
CAUTION
