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10-1 Installing dipole in attic
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In a word: no But that is not the problem being solved; getting on the air at all is the present problem You will find that the pattern of the constrained dipole is distorted compared with that of the regular dipole In addition, the feedpoint impedance is not going to be 73 (except if by fluke), so you will be required to use an antenna tuner of some kind You are well advised to read the chapter on antenna instruments and measurements so that you can be prepared to figure out any feed problems that crop up as well they might The wire used in the constrained dipole (or other forms of attic antenna) should be mounted on TV-type screw-in standoff insulators Almost any outlet that sells TV antennas, or installation parts, will have them These standoff insulators are also available in many hardware stores, and department stores that sell TV antennas or Harry and Harriet Homeowner supplies, in addition to electronics parts suppliers Do not simply tape the wire to the wooden underside of your roof The reason is simple: in a poorly tuned antenna, voltages can get high enough at the ends to produce corona effects; arcing could be a fire hazard Also, use insulated wire to avoid accidental contact in the event that someone is in the attic when you are operating Be aware that the insulation might affect the propagation velocity of signals in the wire, so it will slightly alter the required length
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234 Hidden and limited-space antennas Another alternative for the attic antenna, and one that avoids some of the problems of corona effects, is the nonresonant loop shown in Fig 10-2 Although specified as a top view, the loop can be installed in the configuration that best uses the space In fact, the best performance will be bidirectional when the loop is installed vertically In this case, a large loop (as large as can be accommodated in the space available) is installed in the attic Again, use standoff insulators and insulated wire for the installation The giant loop is fed with parallel line, and is tuned with a balanced antenna tuning unit As was true with the constrained dipole, the performance is not to be equated with the performance of more regular antennas; but, with the prospect of not being on the air at all ! Once again we have a compromise antenna for a compromising situation Another ploy is the old flagpole trick shown in Fig 10-3 Some developments allow homeowners to vent their patriotism by installing flagpoles and flagpoles can be disguised antennas In the most obvious case, you can install a brass or aluminum flagpole and feed it directly from an antenna tuning unit For single-band operation, especially on the higher frequencies, you can delta-feed the flagpole unobtrusively, and call your flagpole a vertical antenna But that is not always the best solution Figure 10-3 shows two methods for creating a flagpole antenna, and both depend on using white PVC plumbing pipe as the pole The heavier grades of PVC pipe
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Hidden antennas 235 are self-supporting to heights of 16 to 20 ft, although lighter grades are not selfsupporting at all (hence are not usable) Figure 10-3A shows the use of a PVC flagpole in which a no 12 (or no 14) wire is hidden inside This wire is the antenna radiator For some frequencies, the wire will be resonant, and for others, it will surely be nonresonant Because of this problem an antenna tuning unit is used either at the base of the antenna or inside at the transmitter
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