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Which of the following is a VOR/DME frequency that the pilot will tune?
  • A
    108.10 MHz.
  • B
    108.20 MHz.
  • C
    118.80 MHz.
  • D

    112.825 MHz.

VHF Omni-directional Range (VOR) provides bearing information typically aligned with magnetic north at the VOR station's location. When a VOR frequency is combined with a co-located Distance Measuring Equipment (DME), it allows for an immediate determination of both range and bearing, referred to as a Rho-Theta fix. VOR operates within the frequency range of 108 to 117.95 MHz. For the band 108-112 MHz (band shared with ILS) available frequencies are 108.0, 108.05, 108.20, 108.25, 108.40, 108.45 ….. 111.85 MHz (even decimals and even decimals plus 0.05 MHz).

Distance Measuring Equipment (DME) is a secondary radar system that allows an aircraft to determine its distance from a ground station. A pilot can obtain precise magnetic bearings from a VHF Omni-range (VOR) beacon and precise slant ranges from a DME. DME, with emission code P0N, operates within the UHF band, spanning from 960 to 1215 MHz with 1 MHz intervals, resulting in 252 available spot frequencies or channels. There is consistently a +/- 63 MHz frequency difference between the interrogation and transponding frequencies. Civil aircraft typically utilize cost-effective VOR/DME equipment and choose the appropriate paired VHF frequency to obtain range information from either a DME or military TACAN facility.

In summary, in order to receive distance and bearing information from a VOR/DME station, the VHF frequency of the VOR should be used. This frequency will be between 108 to 117.95 MHz and for the frequencies between 108-112 MHz the digit after the decimal should be even or even plus 0.05.

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