Transcription of Direction Finding Antennas
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Direction Finding Antennas
Chapter 14. Direction Finding Antennas he use of radio for Direction - Finding purposes (RDF) is almost as old as its application for com- T munications. Radio amateurs have learned RDF techniques and found much satisfaction by par- ticipating in hidden transmitter hunts. Other hams have discovered RDF through an interest in boating or aviation where radio Direction Finding is used for navigation and emergency location systems. In many countries of the world, the hunting of hidden amateur transmitters takes on the atmo- sphere of a sport, as participants wearing jogging togs or track suits dash toward the area where they believe the transmitter is located. The sport is variously known as fox hunting, bunny hunting, ARDF. (Amateur Radio Direction Finding ) or simply transmitter hunting. In North America, most hunting of hidden transmitters is conducted from automobiles, although hunts on foot are gaining popularity.
Direction Finding Antennas 14-3 Fig 3—Small loop consisting of several turns of wire. The total conductor length is very much less than a wavelength. Maximum response is in the plane of the loop. Fig 2—Shielded loop for direction finding. The ends of the shielding turn are not connected, to prevent shielding the loop from magnetic fields.
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