VHF Omnidirectional Ranging

(N5171B / N5172B / N5181B / N5182B / N5182N with Option 302)

VHF Omnidirectional Ranging (VOR) is a system used to guide aircraft from one location to another. VOR stations are located such that they can provide complete coverage for air traffic. Each station radiates a carrier in the 108 MHz to 118 MHz band, which is modulated in a way that provides aircraft bearing information relative to the transmitter location. There are two parts to the modulation: a 30 Hz reference signal and a 30 Hz variable phase signal.

Required Test Equipment

Test Equipment

Recommended Model

Alternate Model

Spectrum Analyzer

N9030B Opt 5xx1, N9063EM0E Analog Demodulation Measurement Application

N9030A Opt 5xx1, N9063EM0D Analog Demodulation Measurement Application2
  1. Select any option of PXA spectrum analyzer (503, 508, 513, 526, 543, 544, 550) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test. The N9030A/B Option 550 frequency range is adequate for all DUT frequency configurations.
  2. To use the PXA N9030A with N9063EM0D analog demodulation measurement application functionality above 3.5 GHz, the N9030A must be upgraded with either Option MTU or TES. For more information, see the main Required Equipment table.

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following test setup, cables are designated as solid lines and direct connections are designated as dashed lines.
  1. Connect all test equipment as shown.
  2. Connect GPIB cables to all GPIB-controlled test equipment.
  3. While performing this test, follow all instructions on the controller display.

 

Test Setup

In Case of Difficulty

If this performance test fails, perform the following steps in order:

  1. Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the performance test.

  2. Refer to the troubleshooting section of the service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or search for your signal generator model number on the Keysight website.

  3. If necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.