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The specifications listed below represent the minimum performance characteristics at the
time of delivery.
SPECIFICATIONS
Frequency Response:
7.0 GHz – 18.0 GHz
Power Output:
250 Watts
AC Source:
100-240VAC, 50/60 Hz, Single Phase [refer to label information
provided on the amplifier]
Power Gain:
55 dB
Input Impedance:
Nominal 50 Ohms unbalanced
Output Impedance:
Nominal 50 Ohms unbalanced
Input Signal Levels:
< 0 dBm ( 1.0 mW ) See data sheet for specific input drive levels
Duty Cycle:
CW
Spurious:
-50dBc
4.4 Functional Description
The required voltages and currents to operate the TWT are provided by the Helix, Collector and
Filament supplies. The Helix supply provides the negative high voltage potential between TWT
Cathode and ground. The Collector supply provides the high voltage potential between the TWT
Cathode and Collector. The Filament supply provides the Heater voltage and floats at high voltage
Cathode potential. In some tubes a Grid element is used to switch the TWT beam ON and OFF.
The primary control circuitry and the service power supplies (+5V, +/- 12V, + 24V) are energized
when the main circuit breaker is turned ON. Upon pressing the AMP ON switch, the Filament and the
Collector supplies are energized and a three minute warm up time is initiated. At the completion of
the three minute time out the Helix supply is enabled and the Amplifier then goes to STBY mode if
no faults were detected. Upon pressing the OPERATE switch the TWT is then turned ON.
