Advanced Amplifiers AA-28G-2KW-PT User Manual - Page 12

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Please refer to the document "10000 Series Communication Protocol" for details regarding command

encoding, status and analog readings data format as well as command syntax description.

VSWR - For pulsed amplifiers, VSWR will display either a value close to 0, if the reflected

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power is within acceptable levels, or a value above 8000, if the reflected power is excessive. In

the former case, the TWTA will fault.

Heater I, Heater V - TWT filament current and voltage. The faults are ignored during WARM

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UP.

Grid V - Indicates the voltage at the TWT grid. When the TWTA is in Warmup or Standby the

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grid voltage will be virtually identical to bias voltage, reflecting the bias voltage that is applied

to the grid. The operator should not misinterpret the Grid display as a direct representation of

bias voltage.

When in Operate with pulses applied the Grid will display a lower (absolute) value due to the

positive drive pulses interspersed with the negative bias voltage. The amount of reduction is

directly proportional to the duty cycle of the pulses applied.

Bias V - Direct measurement of Bias Voltage. Not present in all units (depends on RFC

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version).

Drive V - Monitors positive drive voltage with maximum and minimum limits. TWTA will not

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fault until placed in Operate.

Collector V - Indicates collector voltage. Collector voltage is present only when the TWTA is

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in Operate.

Collector I - Indicates collector current with maximum limits only. Collector current is present

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only when the TWTA is in Operate with pulses applied (pulsed TWTA's). CW TWTAs will

produce Collector current whenever the TWTA is in operate.

Body V - Indicates body voltage with maximum and minimum limits. Body voltage is present

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only when the TWTA is in Operate. Also known as Cathode or Helix voltage.

Cathode I - Indicates cathode current with maximum limits only. Cathode current is present

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only when the TWTA is in Operate and CW or pulses are applied (pulsed TWTA's).

Helix I - Helix current is present only when the TWTA is in Operate and CW or pulses are

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applied (pulsed TWTA's).

Remote Operation

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