Rohde & Schwarz SMAB-B92 - VHF Omni Directional Radio Range (VOR)

Avionic Standards
R&S
®
SMA100B
111User Manual 1178.3834.02 ─ 05
5.2.1 VHF Omni Directional Radio Range (VOR)
Very high frequency (VHF) omnidirectional radio range (VOR) is used for radio naviga-
tion and helps aircraft to determine their position and stay on course.
A VOR system consists of a ground transmission station and a VOR receiver on the
board of the aircraft.
The transmitter stations operate at VHF frequencies of 108 MHz to 118 MHz (see
Table 5-1), with the code identification (COM/ID) transmitting on a modulation tone of
1.020 kHz. It emits two types of signals:
●
An omnidirectional reference signal (REF) that can consist of two parts:
– 30 Hz frequency modulated (FM) sine wave on subcarrier 9.96 kHz from ampli-
tude modulation (AM) carrier
– 1020 Hz AM modulated sine wave morse code
●
A directional positioning signal, variable (VAR): 30 Hz AM modulated sine waves
with variable phase shift
The position of the aircraft is determined by measuring azimuth as the difference in
phase of those two signals. The magnetic north is defined as the reference point, for
which both signals are exactly in phase.
VOR ICAO Frequencies
The individual values in Table 5-1 cells are:
●
Chan. = ICAO channel number
●
VOR Freq. = VOR Interrogation frequency (MHz)
Table 5-1: VOR ICAO standard frequencies (MHz) and channels
Chan. VOR Freq. Chan. VOR Freq. Chan. VOR Freq. Chan. VOR Freq. Chan. VOR Freq. Chan. VOR Freq.
17X
17Y
108.00
108.05
45X
45Y
110.80
110.85
75X
75Y
112.80
112.85
89X
89Y
114.20
114.25
103X
103Y
115.60
115.65
117X
117Y
117.00
117.05
19X
19Y
108.20
108.25
47X
47Y
111.00
111.05
76X
76Y
112.90
112.95
90X
90Y
114.30
114.35
104X
104Y
115.70
115.75
118X
118Y
117.10
117.15
21X
21Y
108.40
108.45
49X
49Y
111.20
111.25
77X
77Y
113.00
113.05
91X
91Y
114.40
114.45
105X
105Y
115.80
115.85
119X
119Y
117.20
117.25
23X
23Y
108.60
108.65
51X
51Y
111.40
111.45
78X
78Y
113.10
113.15
92X
92Y
114.50
114.55
106X
106Y
115.90
115.95
120X
120Y
117.30
117.35
25X
25Y
108.80
108.85
53X
53Y
111.60
111.65
79X
79Y
113.20
113.25
93X
93Y
114.60
114.65
107X
107Y
116.00
116.05
121X
121Y
117.40
117.45
27X
27Y
109.00
109.05
55X
55Y
111.80
111.85
80X
80Y
113.30
113.35
94X
94Y
114.70
114.75
108X
108Y
116.10
116.15
122X
122Y
117.50
117.55
29X
29Y
109.20
109.25
57X
57Y
112.00
112.05
81X
81Y
113.40
113.45
95X
95Y
114.80
114.85
109X
109Y
116.20
116.25
123X
123Y
117.60
117.65
31X
31Y
109.40
109.45
58X
58Y
112.10
112.15
82X
82Y
113.50
113.55
96X
96Y
114.90
114.95
110X
110Y
116.30
116.35
124X
124Y
117.70
117.75
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