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What is the frequency of rotation of the directional beam in a VOR?

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What is the frequency of rotation of the directional beam in a VOR?

(a) 20rps

(b) 15rps

(c) 30rps

(d) 50rps

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Asked question is from Point Source Radio Systems topic in division Terrestrial Radio Navigation System of Avionics

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Correct choice is (c) 30rps

The explanation: The VOR sends out two signals. One is a highly directional signal that rotates at a frequency of 30 rps and an omnidirectional signal. The omnidirectional signal is pulsed every time the directional signal coincides with north.

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