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?
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.