Avionics News April 2023 - 56

series
B Y
T H O M A S
I N M A N
Distance measuring
equipment
P
rior to the formation of the National Center for
Aircraft Technician Training, teachers would
group systems together based on similarities
in technology. The NCATT endorsement structure groups
systems together from a user standpoint. For this reason,
this Theory & Practice article will change direction this
month to discuss distance measuring equipment, or DME.
Unlike VOR and ADF (see last month's Theory &
Practice), which passively receive signals from a ground
station, DME actively interrogates a ground station called a
transponder. The DME transponder will answer the DME,
which will make time measurements to calculate distance,
speed and an estimated time en route. When used with a
VOR, the pilot can receive bearing or radial information
along with distance information. DME can also be used with
precision systems designed to allow pilots to locate a runway.
DME grew from the military tactical navigation system
known as TACAN. In fact, some VOR stations and
TACAN stations share a location (co-location). These
stations are known as VORTACS. VOR stations co-located
with DME transponders are known as VORDME stations.
From the perspective of the aircraft, use of a VORTAC or
VORDME is identical.
DME is an active radar type system using frequencies
from 978 megahertz to 1.213 gigahertz. Technicians
should note, TACAN has more frequencies available. The
system is duplex, which means it uses two frequencies
- one for transmit and another for receive. These two
frequencies will be separated by 63 MHz. For example, if
the DME is transmitting on 1.041 GHz, it will be receiving
on 978 MHz. There are 100 frequency pairs available.
The DME pairs are assigned to VHF navigation
Varying around mS
X mode µS
Y mode µS
X mode µS
Y mode µS
FIGURE 1: DME uses pairs of Gaussian shaped pulses
56 avionics news * april 2023

Avionics News April 2023

Table of Contents for the Digital Edition of Avionics News April 2023

Avionics News April 2023 - Intro
Avionics News April 2023 - Cover1
Avionics News April 2023 - Cover2
Avionics News April 2023 - 1
Avionics News April 2023 - 2
Avionics News April 2023 - 3
Avionics News April 2023 - 4
Avionics News April 2023 - 5
Avionics News April 2023 - 6
Avionics News April 2023 - 7
Avionics News April 2023 - 8
Avionics News April 2023 - 9
Avionics News April 2023 - 10
Avionics News April 2023 - 11
Avionics News April 2023 - 12
Avionics News April 2023 - 13
Avionics News April 2023 - 14
Avionics News April 2023 - 15
Avionics News April 2023 - 16
Avionics News April 2023 - 17
Avionics News April 2023 - 18
Avionics News April 2023 - 19
Avionics News April 2023 - 20
Avionics News April 2023 - 21
Avionics News April 2023 - 22
Avionics News April 2023 - 23
Avionics News April 2023 - 24
Avionics News April 2023 - 25
Avionics News April 2023 - 26
Avionics News April 2023 - 27
Avionics News April 2023 - 28
Avionics News April 2023 - 29
Avionics News April 2023 - 30
Avionics News April 2023 - 31
Avionics News April 2023 - 32
Avionics News April 2023 - 33
Avionics News April 2023 - 34
Avionics News April 2023 - 35
Avionics News April 2023 - 36
Avionics News April 2023 - 37
Avionics News April 2023 - 38
Avionics News April 2023 - 39
Avionics News April 2023 - 40
Avionics News April 2023 - 41
Avionics News April 2023 - 42
Avionics News April 2023 - 43
Avionics News April 2023 - 44
Avionics News April 2023 - 45
Avionics News April 2023 - 46
Avionics News April 2023 - 47
Avionics News April 2023 - 48
Avionics News April 2023 - 49
Avionics News April 2023 - 50
Avionics News April 2023 - 51
Avionics News April 2023 - 52
Avionics News April 2023 - 53
Avionics News April 2023 - 54
Avionics News April 2023 - 55
Avionics News April 2023 - 56
Avionics News April 2023 - 57
Avionics News April 2023 - 58
Avionics News April 2023 - 59
Avionics News April 2023 - 60
Avionics News April 2023 - 61
Avionics News April 2023 - 62
Avionics News April 2023 - 63
Avionics News April 2023 - 64
Avionics News April 2023 - 65
Avionics News April 2023 - 66
Avionics News April 2023 - 67
Avionics News April 2023 - 68
Avionics News April 2023 - 69
Avionics News April 2023 - 70
Avionics News April 2023 - 71
Avionics News April 2023 - 72
Avionics News April 2023 - Cover3
Avionics News April 2023 - Cover4
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