VOR, ( VHF omnidirectional radio range)

Posted: Aug 19, 2010 |Comments: 0 | Views: 137 |

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VOR is a type of radio navigation system for aircraft. A VOR ground station broadcasts a VHF radio composite signal including the station's identifier, voice (if equipped), and navigation signal. The identifier is morse code. The voice signal is usually station name, in-flight recorded advisories, or live flight service broadcasts. The navigation signal allows the airborne receiving equipment to determine a magnetic bearing from the station to the aircraft.
VOR stations in areas of magnetic compass unreliability are oriented with respect to True North. This line of position is called the "radial" from the VOR. The "intersection" of two radials from different VOR stations on a chart provides an approximate position of the aircraft
The VOR's major advantage is that the radio signals provide navigation using equipment already on board for communications, and usage information is delivered on inexpensive printed charts
VORs are assigned radio channels between 108.0 MHz (megahertz) and 117.95 MHz (with 50 kHz spacing); this is in the VHF (very high frequency) range.
Before using a VOR indicator for the first time, it can be tested and calibrated at an airport with a VOR test facility, or VOT. A VOT differs from a VOR in that it replaces the variable directional signal with another omnidirectional signal, in a sense transmitting a 360° radial in all directions.

There are many methods available to determine what heading to fly to intercept a radial from the station or a course to the station. The most common method involves the acronym T-I-T-P-I-T. The acronym stands for Tune - Identify - Twist - Parallel - Intercept - Track. Each of these steps are quite important to ensure the airplane is headed where it is being directed

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