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TWT efficiency and RF off power consumption

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satellite

satellite

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twt efficiency

Dear friends,

in estimating the power consumption of an RF system including a TWT
I am using a graph showing efficiency wrt OBO (Output back off), and I know tube saturated power.
Nevertheless when no RF is fed in the TWT i don't know what is the
consumption of the TWT. Is there any mean to evaluate it from OBO-efficiency curve!
Any suggestion? Any useful material on the subject?

Many thanks,

Satellite
 

twta efficiency vs output back off

TWT operates in A class. Power consumption does not change with input RF power.
 

twta obo efficiency

Life is not so easy!

TWTs have a consumption that is increasing with output power or backoff.
At zero input RF consumption is 1/3 or 1/4 wrt saturated power consumption.

More like class AB amplifiers!
 

    satellite

    satellite

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reasons why twta output saturates

Power consumption = input power - power recovered by the collector
or
power consumption = power disspated in the collector+filament power +power disspated in the slow-wave structure+RF loss in the structure.
 

Hi satellite,

in which band are you working? Do you have only one carrier or multicarriers? It should reduce your efficiency..

Let me know.

Regards,

Lupin
 

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