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There are two types of VOR (VHF Omnidirectional Range) navigation beacons; the conventional VOR (CVOR) and the Doppler VOR (DVOR).

What are the differences between them? Specifically I would like to know:

  • Do they generate the same navigation signal?
  • Can they be used by the same receiver, or do VOR receivers need to be specially adapted to DVORs?
  • Is one more accurate than the other?
  • Is one more susceptible to interference than the other?
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  • Do they generate the same navigation signal?

The DVOR reverses the useage of the two 30Hz signals. However, by also reversing the direction of it's rotating variable signal it produces exactly the same result in the receiver. The receiver has no "knowledge" that it's a DVOR as opposed to CVOR it's receiving and operates as normal.

  • Can they be used by the same receiver, or do VOR receivers need to be specially adapted to DVORs?

Affirm, same receiver.

  • Is one more accurate than the other?

DVOR is more accurate, and more expensive.

CVOR is required to be ±4°, however DVOR is required to be ±1°, per Convention on International Civil Aviation Annex 10, Volume 1.

  • Is one more susceptible to interference than the other?

The DVOR is more practical in crowded areas or where there are tall buildings. However, it's a big structure - around 100ft in diameter.


Sources: Radar Engineering p.295, liquisearch.com, and trevord.com/navaids

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