Avionics News July 2023 - 48

series
BY THOMAS INMAN
Glideslope
T
his month's Theory & Practice column
examines the final component of an
instrument landing system. So far in
previous months, we have addressed localizer that
gives pilots lateral guidance along with the marker
beacon, which marks specific locations along the
path toward the end of the runway. Some systems
include distance measuring equipment in place of the
marker beacon, and a few use an automatic direction
finder transmitter known as an outer compass locater
Inner marker
Middle Marker
FIGURE 1:
Aircraft above the glidepath
and to the right of the runway
Outer Marker
3000 to 6000 ft
Radio shack
200 ft
Aircraft above
the glide path
and to the left
of the runway
90 Hz (yellow) 150 Hz (blue)
Glideslope modulation
frequency
4-7 miles
Aircraft below
the glide path
and to the left
of the runway
Minimum vectoring
altitude
Aircraft centered on both
the glidepath and the runway
This illustration
of an instrument
landing system
shows marker
beacons and
localizer, but
features glideslope.
placed at the outer marker. This month, we cover the
glideslope system.
The glideslope system provides vertical guidance
to the runway. The glideslope operational theory is
much like that of the localizer. A directional antenna
array broadcasts UHF radio signals from the approach
end of a runway. One signal is modulated with 90
hertz, and the other is modulated with 150 Hz. These
signals overlap, creating a glidepath, at an angle of
2.5 to 3 degrees rising from the touchdown zone of
48 avionics news * july 2023

Avionics News July 2023

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

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