User's Manual

Model 1150A DVOR
2-2 Rev. - November, 2008
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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:
 xx=
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.