Question Pool -- Category E7F

What is a crystal-controlled marker generator?
A.
A low-stability oscillator that "sweeps" through a ban of frequencies
B.
An oscillator often used in aircraft to determine the craft's location relative to the inner and outer markers at airports
C.
A high-stability oscillator whose output frequency and amplitude can be varied over a wide range
D.
A high-stability oscillator that generates a series of reference signals at known frequency intervals

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