The modes in a reflex klystron:

1.	The modes in a reflex klystron:
A.	Give the same frequency but different transit times
B.	Result from excessive transit time across the resonator gap
C.	Are caused by spurious frequency modulation
D.	Are just for theoretical considerations
Answer» B. Result from excessive transit time across the resonator gap

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The modes in a reflex klystron:

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