.net barcode reader component download 8-1A Trap dipole for multiband operation (Courtesy of Hands-On Electronics and in Software

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A 10-meter segment A B 15-meter/40-meter segment
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8-1B Multiband dipole consists of several dipoles fed from a common feedline
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tenna (A-A, B-B, or C-C) is a half-wavelength Therefore, the overall length is found approximately from the standard dipole expressions: Overall length (A + A, B + B, or C + C): Lft = or, for each element alone (A, B, or C): Lft = 234 FMHz [82] 468 FMHz [81]
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As always, close to the earth s surface, these equations are approximations, and are not to be taken too literally Some experimentation will probably be necessary to optimize resonance on each band Also, be aware that the drooping dipoles (B and C in this case) may act more like an inverted-vee antenna (see Chap 7) than a straight dipole, so the equation length will be just a few percent too short In any event, a little spritzing with this antenna will yield results Some amateurs build the multiple dipole from four- or five-wire TV rotator lead That type of wire is used to control antenna rotators, and has either four or five parallel wires in a flat arrangement similar to lamp cord Cut each wire to the length required for a band, and strip off any unused portions Another possibility is the link-tuned dipole shown in Fig 8-1C In this situation, a single conductor is used for each half of the dipole, or actually inverted vee The conductors are broken into segments A, B, and C (or more, if desired) Each segment is separated from the two adjacent sections by inline insulators (standard end insulators are suitable) Segment A is a quarter-wavelength on the highest frequency band of operation, A + B is a quarter-wavelength on the next highest band of operation, and A + B + C is a quarter-wavelength on the lowest frequency band of operation The antenna is tuned to a specific band by either connecting, or disconnecting, a similar wire (see inset) jumper across the insulator that breaks the connection between the segments Either a switch or an alligator clip jumper will short out the insulator to effectively lengthen the antenna for a lower band Some amateurs use single-pole 110-Vac power line switches to jumper the insulator Although I have not tried this method, it should work
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8-1C Multiband inverted vee uses shorting links to change bands
A big disadvantage to this type of multiband antenna is that you must go out into the yard and manually switch the links to change bands, which probably explains why other antennas are a lot more popular, especially in northern latitudes
Tuned feeder antennas
Figure 8-2A shows the tuned feeder type of antenna This antenna can be used from 80 through 10 m, but it requires a special tuner and a length of parallel transmission line There are two ways to get parallel transmission line: make it or buy it Using no 14 or 12 wire, and specially made insulators (also called spreaders), you can make 300-, 450-, or 600- parallel transmission line But that's a pain in the ptusch because you can also buy parallel line rather cheaply I paid $16 for 100 ft of 450- line recently One form of parallel line is ordinary TV-type twin lead, which has an impedance of 300 This line will take up to about 250 W, although some people use it at higher powers (not recommended!) The antenna of Fig 8-2A uses 450- parallel line You can buy insulated 450- twin lead (see Fig 8-2B) that can be handled as easily as TV twin lead and a lot more easily than open (uninsulated) parallel line
The G5RV multiband dipole
Figure 8-3 shows the popular G5RV antenna Although not without some problems, this antenna is very popular It can be used either as a horizontal dipole, a sloper, or an inverted-vee antenna (which is how I used it) The dipole elements are each 51 ft long The feedline can be either 300- or 450- twin lead For 300- cases, use 29 ft of line, and for 450- line, use 34 ft One end of the parallel transmission line is connected to the antenna, and the other end is connected to a length of 50- coaxial
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