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Tom Donaly, KA6RUH wrote:
"---forget what Richard just posted." Suits me. You recall the old story about leading a horse to water. Tom rejects measurements of r-f currents at both ends of a loading coil at work. The currents were clearly differing. Tom must be stuck with battereis and the rise and fall these produce in the current of an inductor. A loading coil is usually in the antenna field in our examples. The loading coil is subject to an incident wave and to a reflected wave. These waves combine in a continuously varying phase relation along the coil to make current, impedance, and voltage all functions of their positions along the coil. Every spot along the coil is different when both waves are sensed together. That`s the way SWR works, and we`re discussing standing-wave antennas. I have a 1982 ARRL Antenna Book. On page 13-3 there is a Fig. 6, "Improved Current Distribution Resulting From Center Loading". The loading coil clearly shows less current at its top than at its bottom. Best regards, Richard Harrison, KB5WZI |
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