Questions tagged [dme]

DME (Distance Measuring Equipment) is, as the name suggests, a system for measuring the slant distance between a suitably-equipped aircraft and a ground-based transponder station; DME stations are often colocated with VOR or ILS installations.

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8
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2answers
633 views

Are there two navaids on the same frequency close enough to be confused?

Several RTCA DO standards require, checks for bad navaid tuning including, "In lieu of using ground-based navigation aid designated operational coverage (DOC), the system should provide, checks ...
11
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1answer
2k views

How can the A320 receive 3 DME signals if it has only 2 DME receivers?

How can the A320 receive simultaneously 3 DME signals (VOR1 + VOR2 + ILS) if it has only 2 DME receivers (and antennas)? Does it multiplex them in some way? If yes, does it mean if one DME receiver ...
1
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1answer
86 views

How does a VOR or a VORDME affect the coding decision between CF or IF-TF respectively?

I was reading of the following case in ARINC 424-17 spec. Unfortunately the image is copyrighted and I can't paste it here, so here is a low(er) quality image of mine replicating the situation: The ...
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1answer
81 views

How is DME station ident coded in ARINC 429?

I understand that labels 242,244, 246, 247 are set for DME Station Id or DME Station Ident. they are marked as discrete. How should I convert the station code from alphabet to these 'discretes'? The ...
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3answers
234 views

What button do I push on the instrument panel to activate DME in VOR navigation? [closed]

For some strange reason I cannot seem to find any information about what button to push on the instrument panel to active the DME. There is plenty of information about how DME works with ...
2
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2answers
208 views

What does it mean to "lock on" to a DME ground station?

I was just reading about the working of the DME the other day and then I read a para which said: The aircraft interrogator "locks on" to the DME ground station once it recognizes a particular ...
4
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2answers
1k views

Why don't aircraft have DME that can automatically convert the slant range to ground range?

Knowing that $a^2 = b^2 + c^2$ where $a = \text{slant range},\ b= \text{ground range},\ c = \text{height}$. Why can't the DME equipment which calculates the slant range then just convert it to the ...
7
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1answer
609 views

How does an airborne DME unit differentiate itself?

The FAA's IFR handbook glosses over a keypoint: The aircraft DME transmits interrogating radio frequency (RF) pulses, which are received by the DME antenna at the ground facility. The signal ...
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3answers
1k views

How can I know DME distance? [closed]

When I fly 12000ft, how can I know a distance from DME station? Is there any formula to know or measure distance from DEM?
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1answer
1k views

What is the available range for DME, and why do we need EFC?

How far from the station can a DME signal be picked up, and why do we need EFC?
8
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1answer
1k views

How can I triangulate a position using two DMEs?

What is the formula for determining an aircraft's position (latitude, longitude) using barometric altitude and the ranges to two DMEs?
0
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1answer
325 views

Do UAVs use ground-based navaids?

When I Googled it seems it is not common to use Vortac like systems from UAVs as a backup to GNSS outages, like in manned aircraft. And also I haven't seen any equipment designed for just UAV ...
4
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1answer
868 views

Are there benefits in training instrument students how to fly a DME arc?

With more instrument approach procedures being designed for RNAV/GPS equipped aircraft, and considering the high level of radar coverage currently available, is there a need to spend much valuable ...