![]() You will need a so called splitter for two receivers to work on one antenna. It is the 3rd harmonic frequency and is easily received by this antenna. These ILS signals are transmitted at a frequency three times higher than the VOR frequency and the VOR antenna can pick them up too. The same antenna can be used by the localizer receiver for the ILS (Instrument Landing System). COM signals are radiated vertically thus in all directions (omni-directional) hence the vertical positioned antennas on the back and belly of the aircraft. Some aircraft have a so called dipole layed out horizontally in the (composite, only (not carbon)) fuselage. To learn more about the range of a VOR read our article about aircraft antennas. There is also a "cone of silence" directly above the VOR, this is due to mechanical and radio technical reasons: the signal is transmitted in a horizontal plane and not vertical. This varies with altitude and VOR transmitting power of course. you cannot 'see' it) there will be no reception either, usually. This means that if the VOR is located on the other side of the horizon (ie. The reception range of a VOR is line of sight (like all other VHF and higher frequencies). The radio signals transmitted by the VOR (range 108 - 117.95 MHz) are picked up by a horizontal oriented antenna and this antenna is usually located on the vertical fin on the aircraft. VOR stations can also be used to transmit other data like meteorological or even ATC calls to aircraft with COM failures. Its either out of order or being serviced, but check your NOTAMs to verify VOR availability. If its not transmitting or sends the word 'test', don't use it. ![]() Why Morse? Its easier to pickup than spoken word and positively identifies the VOR even if reception is not perfect. The VOR also sends its own identification in Morse code (pull the squelch and turn up the volume). The VOR is oriented in such a way that the 0 radial is pointing to the magnetic north pole. They are numbered from 0 to 359, one for every degree and called FROM the VOR. We start with things every pilot should know about using and operating the VOR.Ī VOR station sends out radio signals (beams) like the spoke of a wheel in the VHF frequency band. There is enough information on that subject to be found in aviation books and on the Internet. On this page we discuss how easily such a device is operated and not how it works in-depth technically. It thus provides course guidance, automatic wind correction and magnetic headings to fly on. The objective is to show the pilot on which spoke, of the wheel, he/she is flying and in which direction. Basically the system consists of two parts: the transmitting station on the ground and the receiver in the aircraft with indicator, either mechanical or on a multi function EFIS display. It is a radio transmitter capable of sending signals resembling the spokes of a bike wheel. VOR stands for Very High Frequency Omnidirectional Range.
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