NDBs and VORs are both radio beacons, but function very differently.
The VOR is a beacon that projects 360 separate radio beams, one in every compass degree. Each beam is called a radial. The bearing indicator in the cockpit can differentiate between the radials and tell you which one you are currently on. For example, let's say that you started over the VOR and flew directly north. If you had the bearing indicator in the cockpit tuned to receive the 360 degree radial, then the dial would remain in the center of the instrument. However, if you then changed and began to fly at a heading of 005 degrees, the needle in the instrument would move to the left because the 360 degree radial would be to your left (imagine the radials as painted lines on the ground radiating from the VOR in every direction). Often planes navigate from VOR to VOR, but there are also thousands of imaginary navigational fixes that planes may use as waypoints in their flight plan. Each of these imaginary points is the meeting point between certain VOR radials. For example, the waypoint "CYPER" in New York does not have a VOR or NDB, but it is defined as the meeting point between the 222 degree radial of the Albany VOR and the 127 degree radial of the Rockdale VOR. Therefore, if a pilot has both of the VHF receivers tuned to those VORs and one of his bearing indicators tuned to the right radials, when the needles are centered he or she knows that they are at the CYPER waypoint. In addition, most VORs are equipped with distance measuring equipment. That means that if you have the right system in your plane, the VOR can tell you how far you are from it. VORs also have substantially more range that NDBs.
NDBs และ VORs มีเบคอนทั้งวิทยุ แต่ฟังก์ชันแตกต่างกันมาก The VOR is a beacon that projects 360 separate radio beams, one in every compass degree. Each beam is called a radial. The bearing indicator in the cockpit can differentiate between the radials and tell you which one you are currently on. For example, let's say that you started over the VOR and flew directly north. If you had the bearing indicator in the cockpit tuned to receive the 360 degree radial, then the dial would remain in the center of the instrument. However, if you then changed and began to fly at a heading of 005 degrees, the needle in the instrument would move to the left because the 360 degree radial would be to your left (imagine the radials as painted lines on the ground radiating from the VOR in every direction). Often planes navigate from VOR to VOR, but there are also thousands of imaginary navigational fixes that planes may use as waypoints in their flight plan. Each of these imaginary points is the meeting point between certain VOR radials. For example, the waypoint "CYPER" in New York does not have a VOR or NDB, but it is defined as the meeting point between the 222 degree radial of the Albany VOR and the 127 degree radial of the Rockdale VOR. Therefore, if a pilot has both of the VHF receivers tuned to those VORs and one of his bearing indicators tuned to the right radials, when the needles are centered he or she knows that they are at the CYPER waypoint. In addition, most VORs are equipped with distance measuring equipment. That means that if you have the right system in your plane, the VOR can tell you how far you are from it. VORs also have substantially more range that NDBs.
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