MNC-0400-048
7 of 14
Revision B
Operation, TWTA ODU Amplifier
Turn Power On
Turn ON the Power Switch on the amplifier. When filament time delay
is complete the amplifier is ready to transmit.
Turn Power Off
When the amplifier is going to be OFF for an extended period of time,
select Standby, and then push the Power Button on the front panel to
turn OFF the power. This will extend the life of the TWT. For short
periods of time, an hour or less, it is best to turn the HV OFF by
commanding Standby via the serial interface.
Operating Modes
There are five amplifier operating modes:
•
Standby
•
Transmit
•
Fault
•
Heater Standby
•
Filament Time Delay
Standby Mode
In this mode the XTD is ready for high voltage to be applied to
begin transmitting.
Transmit Mode
When transmit is enabled RF input signals are amplified and
passed to the RF output. If transmit ON is selected before the
Filament Time Delay cycle is complete, High Voltage will remain
OFF until FTD is complete.
Fault Mode
The Fault Mode exists when a condition detrimental to the XTD or a
safety issue is detected by the fault detection circuitry. Table 1 lists
the alarms and faults.
When a fault occurs in the XTD, the HV shuts off, and the Status LED
will turn red.
The date, time, and type of fault is recorded in the Fault History Log.
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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.
