The primary purpose of the helix in a traveling-wave tube is to – McqOptions

MCQOPTIONS

1.	The primary purpose of the helix in a traveling-wave tube is to
A.	prevent the electron beam from spreading in the long tube
B.	reduce the axial velocity of the rf field
C.	ensure broadband operationreduce the noise figure
D.	none ofthe above.
Answer» C. ensure broadband operationreduce the noise figure

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