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Example text

Bruce R. 42 Chapter 20 A TREE-MOUNTED HF GROUNDPLANE ANTENNA A tree-mounted, vertically polarized antenna may sound silly. But is it, really? Perhaps engineering references do not recommend it, but such an antenna does not cost much, is inconspicuous, and it works. This idea was described by Chuck Hutchinson, K8CH, in QST for September 1984. 48. A piece of RG-58 cable runs to the feedpoint of the antenna, and is attached to a porcelain insulator. Two radial wires are soldered to the coax-line braid at this point.

Once the trap is adjusted it can be installed in the antenna, and no further adjustment will be required. It is easy, however, to be misled after the system is assembled: Attempts to check the trap with a dip meter will suggest that the trap has moved much lower in frequency (approximately 5 MHz lower in a 20/15m vertical). This is because the trap is part of the overall antenna, and the resultant resonance is that of the total antenna. Measure the trap separate from the rest of the antenna. Multiband operation is quite practical by using the appropriate number of traps and tubing sections.

Or perhaps you might use lag screws to mount the boom temporarily to a suitable tree on Field Day! 5-foot level and tied there using insulators and rope. The lowest points of the loops are located about 25 feet above ground for a 70-foot tower. 38 gives dimensions for the driven element and reflector for both the CW and the Phone portions of the 40-meter band. Guy Wires Anyone who has worked with quads knows they are definitely three-dimensional objects! You should plan your installation carefully, particularly if the supporting tower has guy wires, as most do.

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