Wave guides are pressurised above normal atmospheric pressure for:

1.	Wave guides are pressurised above normal atmospheric pressure for:
A.	Increasing their power handling capacity
B.	Improving the conductivity of their walls
C.	Preventing higher order modes from propagating
D.	Varying the wave impedence
Answer» D. Varying the wave impedence

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Wave guides are pressurised above normal atmospheric pressure for:

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