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.
rather than at the bottom, will not alter the polarization and will only degrade performance. To obtain horizontal polarization from a small loop, it must be oriented in a horizontal plane, parallel to the earth. In this position the loop response is essentially omnidirectional. The earliest loop antennas were of the “frame antenna” variety.
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