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Subelement K
Aircraft
Section 68
Distance Measuring Equipment
What is the frequency range of the Distance Measuring Equipment (DME) used to indicate an aircraft’s slant range distance to a selected ground-based navigation station?
  • 108.00 MHz to 117.95 MHz.
  • 108.10 MHz to 111.95 MHz.
  • Correct Answer
    962 MHz to 1213 MHz.
  • 329.15 MHz to 335.00 MHz.

What is the frequency range of the Distance Measuring Equipment (DME) used to indicate an aircraft’s slant range distance to a selected ground-based navigation station?

962 MHz to 1213 MHz.

The device sends a radio waves (150 pps) in the frequency (UHF L-band) above 960 MHz and below 1,215 MHz, measuring the time it takes to return. Using the constant of wave travel time/distance, the distance from the airplane to the ground transponder.

The path cannot have obstructions, such as mountains, etc. The DME is a system of on-board and ground DME stations that use radio waves as navigation beacons. There are limits to how many signals a DME can process, so it is possible for it to be overloaded.


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

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The Distance Measuring Equipment (DME) measures the distance from the aircraft to the DME ground station. This is referred to as:
  • DME bearing.
  • Correct Answer
    The slant range.
  • Glide Slope angle of approach.
  • Localizer course width.

The Distance Measuring Equipment (DME) measures the distance from the aircraft to the DME ground station. This is referred to as:

The slant range.

Back to trigonometry and angles, the device sends a radio waves (150 pps) in the frequency (UHF L-band) above 960 MHz and below 1,215 MHz, measuring the time it takes to return. Using the constant of wave travel time/distance, the distance from the airplane to the ground transponder.

The path cannot have obstructions, such as mountains, etc. The DME is a system of on-board and ground DME stations that use radio waves as navigation beacons. There are limits to how many signals a DME can process, so it is possible for it to be overloaded.


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

Last edited by markadlerdallas. Register to edit

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The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:
  • Someone to answer the call.
  • The VOR to make a mechanical hook-up.
  • Correct Answer
    Operation at close range.
  • Clear other traffic for a reply.

The Distance Measuring Equipment (DME) ground station has a built-in delay between reception of an interrogation and transmission of the reply to allow:

Operation at close range.

The measurement is made at a slanted angle, so if it is too close with the ground stations close, the angle is small. For some angles, the system adjusts, but delay between get/respond operation helps with the calculation, to measure the difference.


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

Last edited by markadlerdallas. Register to edit

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What is the main underlying operating principle of an aircraft’s Distance Measuring Equipment (DME)?
  • Correct Answer
    A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere.
  • The difference between the peak values of two DC voltages may be used to determine an aircraft’s distance to another aircraft.
  • A measurable frequency compression of an AC signal may be used to determine an aircraft’s altitude above the earth.
  • A phase inversion between two AC voltages may be used to determine an aircraft’s distance to the exit ramp of an airport’s runway.

What is the main underlying operating principle of an aircraft’s Distance Measuring Equipment (DME)?

A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere.

This is how the distance is calculated using the constant of wave travel time/distance, the distance from the airplane to the ground transponder.


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

Last edited by markadlerdallas. Register to edit

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What radio navigation aid determines the distance from an aircraft to a selected VORTAC station by measuring the length of time the radio signal takes to travel to and from the station?
  • RADAR.
  • Loran C.
  • Distance Marking (DM).
  • Correct Answer
    Distance Measuring Equipment (DME).

What radio navigation aid determines the distance from an aircraft to a selected VORTAC station by measuring the length of time the radio signal takes to travel to and from the station?

Distance Measuring Equipment (DME).

The VORTAC system consists of the VOR and TACAN.

The Very High Frequency Omnidirectional Range (VOR) is a ground-based electronic system that provides azimuth information for high and low altitude routes and airport approaches.

See FAA site for the article Ground-Based Navigation - Very High Frequency Omni-Directional Range (VOR)

The TACAN is the TACtical Air Navigation system, works in the in the frequency (UHF L-band) above 960 MHz and below 1,215 MHz. In fact, TACAN, an accurate military system, uses DME, which also uses the same frequency range.


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

Last edited by markadlerdallas. Register to edit

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The majority of airborne Distance Measuring Equipment systems automatically tune their transmitter and receiver frequencies to the paired __ / __ channel.
  • VOR/marker beacon.
  • Correct Answer
    VOR/LOC.
  • Marker beacon/glideslope.
  • LOC/glideslope.

The majority of airborne Distance Measuring Equipment systems automatically tune their transmitter and receiver frequencies to the paired __ / __ channel.

VOR/LOC.

The VOR stands for VHF Omnidirectional Range

LOC is the LOCalizer system.

Together VOR/LOC refer to the VHF Omnidirectional Radio Range Localizer.

For more information, please see Flight Literacy site for the article on Traditional Navigation Systems – Distance Measuring Equipment (DME)


Please see Wikipedia's article on Distance measuring equipment

See Sky Brary site for the article on Distance Measuring Equipment (DME)

For good illustration, please see the AOPA site, for the article on HOW IT WORKS: DISTANCE MEASURING EQUIPMENT

For concise but in-depth info, please see CFnotebook site for the article Distance Measuring Equipment

For complete reference, please see the FAA page for Section 1. Navigation Aids

Last edited by markadlerdallas. Register to edit

Tags: none

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