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Cecil, W5DXP wrote:
"I`m just reporting conditions at my QTH." Every installation is unique, but horizontal power lines are often long in terms of h-f waves. At a distance, one receives radiation from the wires which tends to make a zero sum. This happens even though the h-f is likely common-mode on the wires. Every power pole is supposed to be grounded. Radiation induced and other spurious currents in the power lines drains to the earth through this multitude of earth connections. Though the phase of these currents to earth varies in the various ground wires, you are often closer to one than the others. Radiation phase from that particular ground wire is usually not a jumble at a given frequency due to limited height of the pole. Your proximity to one pole often derives from being served with electricity from that pole. As horizontally polarized signals don`t propagate via ground wave and suffer extreme attenuation due to cross-polarization when sweeping vertical wires, inducing little energy in them, and due to vertically polarized radiation from vertical wires on power poles, vertically polarized radiation is all you get from the poles. For an Idea of r-f currents in the ground wire on a power pole, explore close to the pole the signals it radiates with a transistor battery operated portable radio. They can be intense. Best regards, Richard Harrison, KB5WZI |
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