Keysight EXG and MXG X-Series Signal Generators User’s Guide 349
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using VOR [VHF Omnidirectional Range] Softkeys
To set the amount of FM deviation that the 30 Hz reference signal
(REF Freq) applies on the sub-carrier
1. Press Aux Fctn > Avionics > VOR
2. Press REF/VAR
3. Press REF Deviation
(Default <value> is 480 Hz.)
4. Select a <value> in Hz | kHz | MHz | GHz from 0 Hz to 1 kHz.
Enter a value in Hz to set the amount of FM Deviation that the 30 Hz reference
signal (REF Freq) applies on the sub-carrier.
The 30 Hz reference signal (REF Freq) is placed on a sub-carrier of 9960 Hz
(SubCarrier Freq) using frequency modulation with a peak deviation set to
480 Hz (REF Deviation). This frequency modulated sub-carrier is then
amplitude modulated onto one of the VOR carriers (108.00 to 117.95 MHz).
This makes the reference signal essentially an FM/AM multiplex signal.
To set the AM depth of the variable phase signal (VAR Freq)
1. Press Aux Fctn > Avionics > VOR
2. Press REF/VAR
3. Press VAR Depth
(Default <value> is 30%.)
4. Select a <value> from 0 to 49.9% and press Enter.
Enter a value in percentage to set the AM depth of the variable phase signal
(VAR Freq).
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