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Numeric Measurement Modes
R&S
®
EVSG1000
103
User Manual 1178.6227.02 ─ 06
FM Modulation Depth
The FM deviation Devia
FM30
(typically 480
Hz) is calculated by estimating the magni-
tude of the FM demodulated 30
Hz reference signal.
Azimuth (Phase Difference at 30 Hz)
The phases of both the 30
Hz FM and 30
Hz AM signal are estimated at exactly the
same time instant. The azimuth (Phase FM-AM) is calculated as the phase difference
between the two.
AF Frequencies
In the VOR demodulator the AF frequencies are calculated:
●
Freq
AM30
: 30
Hz Rotational-signal (AM)
●
Freq
FM30
: 30
Hz Reference-signal (FM)
●
Freq
ID
: voice / identification; From 300
Hz to 4
kHz, typically 1020
Hz
●
Freq
9960
: The carrier frequency of the FM carrier, typically 9960
Hz; Calculated as
mean value of the FM demodulator output
4.3.1.3
Phase Notation in VOR Measurements
In VOR measurements, the phase can be provided using two different notations, indi-
cated in the following illustration:
Figure 4-20: Phase notation in VOR measurements
Phase is always counted counter-clockwise, starting at the reference.
The reference depends on the selected notation:
●
FROM
: North direction at the VOR beacon
VOR Mode (Option R&S
EVSG-K2)