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Creation DataMatrix in Software Copyright 2001 - the McGraw-Hill Companies

Copyright 2001 - the McGraw-Hill Companies
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440 Antennas for radio direction finding (RDF)
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23-1 Radio direction finding (RDF) receiver using a loopstick antenna
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23-2A Pattern of loopstick antenna: not oriented towards signal
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Antennas for radio direction finding (RDF) 441
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23-2B Pattern of loopstick antenna: oriented towards signal
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purpose Fortunately, the minima are very sharp You can get a good fix on the direction of the signal by pointing the minima toward the station This point is found by rotating the antenna until the audio goes to zip or the S meter dips to a minimum (Fig 23-2B) The loopstick is a really neat way to do RDF except for one little problem: The darn thing is bidirectional There are two minima because, after all, the pattern is a figure 8 You will get exactly the same response from placing either minima in the direction of the station As a result, the unassisted loopstick can only show you a line along which the radio station is located, but can t tell you which direction it is Sometimes this doesn t matter If you know the station is in a certain city, and that you are generally south of the city, and can distinguish the general direction from other clues, then the line of minima of the loopstick will refine that information A compass helps, of course Shortly we will take a look at an impromptu radio direction finder using a portable radio The solution to the ambiguity problem is to add a sense antenna to the loopstick (Fig 23-3) The sense antenna is an omnidirectional vertical whip, and its signal is combined with that of the loopstick in an RC phasing circuit When the two patterns are combined, the resultant pattern will resemble Fig 23-4 This pattern is called a cardioid because of the heart shape it exhibits This pattern has only one null, so it resolves the ambiguity of the loopstick used alone
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442 Antennas for radio direction finding (RDF)
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23-3 Addition of sense antenna overcomes directional ambiguity of the loopstick
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23-4 Cardioid pattern of sense-plus-loopstick antennas
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Field improvisation 443
Field improvisation
Let s suppose you are out in the woods trekking around the habitat of lions, tigers, and bears (plus a rattlesnake or two for good measure) Normally you find your way with a compass, a Geological Survey 75-min topological map, and a Global Positioning System (GPS) receiver Those little GPS marvels can give you real good latitude and longitude indication But what happens if it breaks or a bear eats it The answer to your direction finding problem might be the little portable AM BCB radio (Fig 235) that you brought along for company Open the back of the radio and find the loopstick antenna You will need to know which axis it lies along In the radio shown in Fig 23-5 the loopstick is along the top of the radio, from left to right In other radios it is vertical, from top to bottom Once you know the direction, you can tune in a known AM station and orient the radio until you find a null Your compass can give you the bearing If you know the approximate location of the station, then you can reverse the compass direction from it and mark the line on the topo map Of course, it s still a bidirectional indication, so all you know is the line along which you are lost But then you tune into a different station in a different city (or at least wide enough from the line to the other station to make a difference) and take another reading Your approximate location is where the two lines cross Take a third, fourth, and fifth reading and you will home in pretty tight If you were smart enough to plan ahead, you will have selected candidate stations in advance and located their latitude and longitude Alternatively, you would have bought the topo map that covers their location as well as where you want to hike, and from those maps you can find the latitudes and longitudes of the distant stations
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