. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. OCEAN ELECTRONIC NAVIGATIONAL AIDS 31. Figure 2-10.—A typical marker radiobeacou uu a lighted buoy. The method of radio direction finding is based on the directive properties of the so-called coil antenna when used for the reception of radio signals. The radio direction finder includes a coil antenna, and operates on the prin- ciple that the amount of electromotive force induced in the vertical loop of wire by an arriving electromagnetic wave de
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. OCEAN ELECTRONIC NAVIGATIONAL AIDS 31. Figure 2-10.—A typical marker radiobeacou uu a lighted buoy. The method of radio direction finding is based on the directive properties of the so-called coil antenna when used for the reception of radio signals. The radio direction finder includes a coil antenna, and operates on the prin- ciple that the amount of electromotive force induced in the vertical loop of wire by an arriving electromagnetic wave depends on the angle between the plane of the loop and the wave front. When the plane of the coil is parallel to the direction of the sending station, the intensity of the signal will be a maximum. As the coil is rotated, the intensity of the signal diminishes until a minimum is reached when the plane of the coil comes to a position at right angles to the line of direction of the signal. The directional characteristic of a coil antenna is illustrated by the diagram in figure 2-12 where the distance from the center of the coil to any point in the circumference of the circles is proportional to the strength of the signal from a direction passing through that Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Coast Guard. Washington, U. S. Govt. Print. Off.
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