If more fly right than fly left is received, the course indicator will fly right. When the fly left and fly right signals are balanced, the course indicator will indicate on course, the needle will be in the center. The pilot intercepts the course and turns towards the runway heading. The course is the runway course and can’t be adjusted by the pilot, turning the OBS has no effect. ![]() The signal does not contain any relative bearing information, The antenna array is located about 1000 feet past the departure end of a runway it is used to transmit two tones, one to indicate to fly left and the other to indicate to fly right. They then turn the heading to that course and follow the fly left – fly right needle indications to navigate to the VOR location.Ī localizer works differently. To fly directly from any position to the VOR location, one tunes the VOR, identifies the Morse code to verify they tuned the correct frequency, turns the OBS until the needle centers on the indicator and the To/From flag reads To. In this way the pilot is able to select any course to or from the VOR and use it for navigation. It then outputs the comparison to the left-right course indicator and to the To/From flag. It takes the pilot selected radial from the Omni Bearing Selector (OBS) and compares it with the other two signals. The receiver decodes both of the directional signals and sends them to a box called a VOR converter. The audio is sometimes used for communication or weather information, but most often, it is used to identify the VOR identifier via Morse Code. The VOR also can transmit audio that the pilot can listen to. In other words, one signal contains a reference and the other contains the bearing information. In the case of a VOR signal, it consists of two signals, one a reference signal and the other a variable signal that is phase shifted based on the relative radial. The two systems use different methods of modulating the signal.
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