A Ruby Maser is preferred to Ammonia Maser for microwave amplification

1.	A Ruby Maser is preferred to Ammonia Maser for microwave amplification because it has:
A.	much greater bandwidth
B.	lower noise figure
C.	better frequency stability
D.	no need for a circulator
Answer» D. no need for a circulator

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A Ruby Maser is preferred to Ammonia Maser for microwave amplification because it has:

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