TECHNICAL NOTE – OPERATION OF MT4000 TWTA
10/24/03
TN4000-3
MCL, INC.
46 of 46
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 operation, see the Tube Fault Counter Operation
paragraph of this document.
This completes the procedure necessary to bring the MT4000 TWT amplifier system into full and
complete system operation. The MT4000 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 TN4000-6 Technical Note,
Troubleshooting & Customer Service Guide for MT4000.
6.0
SHUT DOWN PROCEDURE
To discontinue operation of a MT4000 TWT amplifier system, the following procedure is
recommended for system shutdown:
1.
Remove the input RF drive to the amplifier system.
2.
Depress Standby switch until illuminated.
3.
Place the HPA into Filament Off.
NOTE
If the HPA is connected to an M&C system and you wish to keep
The HPA on the bus, do not perform the following steps.
4.
Let HPA remain on (to cool down) until the tube temperature is below 35
°
C.
5.
Turn off the Main AC Power switch.
Under extreme emergencies, the operator may totally remove AC input power from the system by
simply switching the Main AC Power circuit breaker to the Off position. This shutdown
procedure is only for emergencies and should not be used under normal circumstances. If
problems occur during the shutdown procedure, refer to TN4000-6 Technical Note,
Troubleshooting & Customer Service Guide for MT4000.
