. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 267—The Radio Goniometer. 256 PRACTICAL WIRELESS Fig. 268—^The Tuned Receiver for the DirectionFinder. 206. The Direction Finder Aerials.—A distinctive feature of the directionfinder equipment is the use of two closed circuit looped aerials having the formof an isosceles triangle as shown in Fig. 271. These aerials bisect each othter at right angles and also hold an angleof 45° with the bow and stern lineof the vessel. It is important that the aerials heplaced in a somewhat clear space
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 267—The Radio Goniometer. 256 PRACTICAL WIRELESS Fig. 268—^The Tuned Receiver for the DirectionFinder. 206. The Direction Finder Aerials.—A distinctive feature of the directionfinder equipment is the use of two closed circuit looped aerials having the formof an isosceles triangle as shown in Fig. 271. These aerials bisect each othter at right angles and also hold an angleof 45° with the bow and stern lineof the vessel. It is important that the aerials heplaced in a somewhat clear space on thedeck and that the two loops have identicaldimensions. The wires should be heldtaut and firmly in place. The current col-lected by the aerials, from the advancingelectromagnetic waves, is made to flowthrough a specially designed set of excita-tion coils, setting up a magnetic held whichacts upon a third coil known as the ex-ploring coil. The latter coil carries apointer which moves over a 360° scale andgives the sense of direction of any trans-mitting station. This portion of the ap-paratus is known as the goniometer, thewindings for which
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
