Selex Sistemi Integrati Inc. VOR2 User Manual
Model 1150A DVOR
2-2
Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
Figure 2-1 RF Spectrum of a Doppler VOR
The deviation frequency is determined by the formula:
x
x
=
f
d
Where:
f
d
equals the deviation frequency in hertz.
W equals the angular velocity of the signal (30 Hz).
X equals the diameter of the ring in wavelengths.
Y equals 3.14.
30
f
=
r
d
d
In the aircraft receiver, a 30 Hz signal is extracted from the 9960 Hz FM subcarrier. The phase of this second 30 Hz
signal varies linearly with the change of the azimuth bearing of the receiving point; for each degree of azimuth
change, the phase of the 30 Hz variable phase signal changes by one degree.
signal varies linearly with the change of the azimuth bearing of the receiving point; for each degree of azimuth
change, the phase of the 30 Hz variable phase signal changes by one degree.