Keysight EXG and MXG X-Series Signal Generators User’s Guide 347
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using VOR [VHF Omnidirectional Range] Softkeys
To set the VOR bearing angle between the VAR signal and the
REF signal
1. Press Aux Fctn > Avionics > VOR
2. Press Bearing
3. Press Angle
(Default <value> is 0.00 deg.)
4. Select a <value> from 0 to 360 deg and press Enter.
By demodulating the transmitted VOR signal, an aircraft receiver can compare
the phases of the two 30 Hz signals (REF Freq vs VAR Freq) to determine the
compass bearing to a VOR station. By tuning to two or more VOR stations and
recording each bearing angle, pilots can determine their exact location on an
air chart by triangulation.
A VOR Bearing Angle is the phase difference between the 30 Hz reference
signal (REF Freq) and the 30 Hz variable phase signal (VAR Freq).
The 30 Hz reference signal (REF Freq) is transmitted from the ground-based
stationary VOR transmitter while the 30 Hz variable phase signal (VAR Freq) is
transmitted from the VOR signal that is rotating at 30 Hz clockwise.
Figure 14-5 VOR Transmitter Antenna Pattern
110.60 112.90 114.50 116.10 117.70
110.65 112.95 114.55 116.15 117.75
110.80 113.00 114.60 116.20 117.80
110.85 113.05 114.65 116.25 117.85
111.00 113.10 114.70 116.30 117.90
111.05 113.15 114.75 116.35 117.95
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