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The VOR reference signal is:
A
Amplitude modulated at 30 Hz, rotating in phase
B
A 30 Hz FM signal that is omnidirectional
C
A 9960 Hz sub-carrier FM modulated at 30 Hz, transmitted omnidirectionally
D
A 30 Hz signal rotating directionally
C
A 9960 Hz sub-carrier FM modulated at 30 Hz, transmitted omnidirectionally✓ Correct Answer
Explanation
The VOR reference signal is a 9960 Hz sub-carrier frequency-modulated at 30 Hz, transmitted omnidirectionally. The variable signal is a 30 Hz AM signal whose phase varies with azimuth.
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