This means that your position is 20/60 or 1/3 of the way around. You receive the all-directional signal and 20 seconds later you receive the rotating signal. For instance, assume it took a minute instead of 1/30 of a second for the rotating signal to make one revolution. The receiver electronically measures the time difference, and it is indicated in degrees as your magnetic bearing in relation to the station (Figure 1). Some time later it picks up the maximum point of the positive rotating signal. Your omni receiver picks up the all-directional signal. These rotating beams and the reference signal result in radial measurements. The all-directional or reference signal is timed to transmit at the same instant the rotating beam passes magnetic north. The rotating signal has a positive and a negative side. The all-directional signal contracts and expands 30 times a second, and the rotating signal rotates clockwise at 30 revolutions per second. One is all-directional (or omnidirectional) and the other is a rotating signal. The VOR frequency band is from 108.00 to 117.95 MHz and uses the principle of electronically measuring an angle. The most useful of the enroute radio navigation aids, other than GPS, is the VHF omnirange, or VOR as it is sometimes called. This introduction comes from The Student Pilot’s Flight Manual, by William Kershner. ![]() We’re devoting this week’s posts to the VOR, a radio navigation system used worldwide by private and commercial pilots.
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