R&S SMA100B - Required Options; VHF Omni Directional Radio Range (VOR)

Avionic standards
R&S
®
SMA100B
128User Manual 1178.3834.02 ─ 09
6.2.1 Required options
The basic equipment layout for generating avionics standards signals includes the
options:
●
Base unit
●
Baseband real-time extension (R&S SMAB-K520)
●
Digital standard ILS (R&S SMAB-K151)
●
Digital standard VOR (R&S SMAB-K152)
●
Digital standard DME (R&S SMAB-K153)
For more information, see data sheet.
6.2.2 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 6-1), 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 the table below are:
●
Chan. = ICAO channel number
●
VOR Freq. = VOR Interrogation frequency (MHz)
Table 6-1: 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
About the Avionics options