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6-5 Vertical extent of dipole antenna at (A) 1 8 wavelength, (B) 1 4 wavelength, and (C) 1 2 wavelength above ground
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The dipole radiation pattern 149 installed at 1/8 wavelength above the surface For this antenna, most of the RF energy is radiated almost straight up (not very useful) This type of antenna is basically limited to ground wave and very short skip (when available) The second case (Fig 6-5B) shows the pattern when the antenna is a quarter wavelength above the earth s surface Here the pattern is flattened, but it still shows considerable energy in the vertical direction (where it is useless) Finally, you can see the pattern obtained when the antenna is installed a half-wavelength above the surface In this case, the pattern is best for long-distance work because energy is redirected away from straight-up into lobes at relatively shallow angles
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Tuning the dipole antenna
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There are two issues to address when tuning an antenna (any antenna, not just the dipole): resonance and impedance matching Although frequently treated in the literature as the same issue, they are not This section deals mostly with the process of tuning the antenna to resonance Although not all forms of antenna are resonant, the dipole is an example of a resonant antenna There is a lot of misinformation abroad concerning the tuning of antennas Perhaps much of what is believed comes from the fact that VSWR is used as the indicator of both impedance matching and resonance Quite a few people honestly, but erroneously, believe that the VSWR can be tuned out by adjusting the length of the feedline That myth probably derives from the fact that voltage or current sensing instruments are used for VSWR measurement, and these are affected by transmission line length But that fact is caused by a weakness in the instruments, not by radio physics There is only one proper way to tune a dipole antenna: adjust the length of the antenna elements, not the transmission line It was in order to make these adjustments that we purposely did not initially tell you to solder the electrical connections at the center insulator Resonance The indicator of resonance is the minimum point in the VSWR curve Figure 6-6 shows a graph of VSWR vs frequency for several different cases Curve A represents a disaster: a high VSWR all across the band The actual value of VSWR can be anything from about 35:1 to 10:1, or thereabouts, but the cause is nonetheless the same: the antenna is either open or shorted; or it is so far off resonance as to appear to be open or shorted to the VSWR meter Curves B and C represent antennas that are resonant within the band of interest Curve B represents a broadbanded antenna that is relatively flat all across the band and does not exhibit excessive VSWR until the frequency is outside of the band Curve C is also resonant within the band, but this antenna has a much higher Q than curve B In the naive sense, the broadbanded antenna is best, but that statement is true only if the broadness is not purchased at the expense of efficiency Losses tend to broaden the antenna, but also reduce its effectiveness So, if broad bandedness is purchased at the risk of increased loss, then it is less than desirable Curves D and E are resonant outside the band of interest The curve marked D is resonant at a frequency on the low side of the band, so the dipole is too long In this case, you need to shorten the antenna a bit to raise the resonant point inside
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