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Radio direction finding can be very useful for locating RF noise sources, illegal stations, and other RF sources It can also be used to locate yourself if you can get bearings on at least two stations The lines of bearing will cross at a location approximately where you are standing try it, you ll like it
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Impedance matching in antenna systems
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ONE OF THE FIRST THINGS THAT YOU LEARN IN RADIO COMMUNICATIONS AND
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broadcasting is that antenna impedance must be matched to the transmission line impedance, and that the transmission line impedance must be matched to the output impedance of the transmitter The reason for this requirement is that maximum power transfer, between a source and a load, always occurs when the system impedances are matched In other words, more power is transmitted from the system when the load impedance (the antenna), the transmission line impedance, and the transmitter output impedance are all matched to each other Of course, the trivial case is where all three sections of our system have the same impedance For example, we could have an antenna with a simple 75- resistive feedpoint impedance (typical of a half-wave dipole in free space), and a transmitter with an output impedance that will match 75 In that case, we need only connect a standard-impedance 75- length of coaxial cable between the transmitter and the antenna Job done! Or so it seems But there are other cases where the job is not so simple In the case of our standard antenna, for example, the feedpoint impedance is rarely what the books say it should be That ubiquitous dipole, for example, is nominally rated at 73 , but even the simplest antenna books tell us that value is an approximation of the theoretical free-space impedance At locations closer to the earth s surface, the impedance could vary over the approximate range of 30 to 130 and it might have a substantial reactive component But there is a way out of this situation We can construct an impedance-matching system that will marry the source impedance to the load impedance This chapter examines several matching systems that might prove useful in a number of antenna situations
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458 Impedance-matching in antenna systems
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Antenna impedance can contain both reactive and resistive components In most practical applications, we are searching for a purely resistive impedance (Z = R), but that ideal is rarely achieved A dipole antenna, for example, has a theoretical freespace impedance of 73 at resonance As the frequency applied to the dipole is varied away from resonance, however, a reactive component appears When the frequency is greater than resonance, then the antenna tends to look like an inductive reactance, so the impedance is Z = R + jX Similarly, when the frequency is less than the resonance frequency, the antenna looks like a capacitive reactance, so the impedance is Z = R jX Also, at distances closer to the earth s surface the resistive component may not be exactly 73 , but may vary from about 30 to 130 Clearly, whatever impedance coaxial cable is selected to feed the dipole, it stands a good chance of being wrong The method used for matching a complex load impedance (such as an antenna) to a resistive source (the most frequently encountered situation in practical radio work) is to interpose a matching network between the load and the source (Fig 24-1) The matching network must have an impedance that is the complex conjugate of the complex load impedance For example, if the load impedance is R + jX, then the matching network must have an impedance of R jX; similarly, if the load is R jX then the matching network must be R + jX The sections to follow look at some of the more popular networks that accomplish this job
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