Antennas & Projects

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It’s important to have the lowest possible losses in the immediate area for both types of verticals. In addition to a ground radial system, 6×6-ft aluminum ground screen is used at the base of the antenna. The screen makes a good tie point for the radials and conducts ground currents efficiently. Seventeen wire radials, each about 33 ft long, are spaced evenly around the antenna. More radials would probably work better. Each radial is bolted to the screen using corrosion-resistant #10-24 hardware.

Antennas & Projects 20. 47 tor, C1, is not used on the higher frequency band, and so it is shorted out to operate there. 9. With the series capacitor shorted, trim the wire length for best SWR at your 40-m frequency of interest. Unshort the capacitor and adjust it for best SWR at your frequency of interest on 80 m. You can further adjust SWR by changing transformer taps. 55, a single capacitance value yields a 2:1 SWR bandwidth of approximately 225 kHz on 80 m. Different capacitance values can be used to cover other parts of the 80-m band.

Alternatively, a protective sleeve of heat-shrink tubing can be applied to the coil after completion. The coil form for the trap should be of high dielectric quality and be rugged enough to sustain stress during periods of wind. 38 Chapter 20 Tips On Installing And Connecting To Ground Rods Driving a ground rod 8 feet into the ground with a sledgehammer batters the rod end into an ugly flare. Some types of ground clamps can’t open far enough to slip over the enlarged rod. Of course, you can file, grind or saw off the flared end, but doing all of these things at ground level can be difficult.

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