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Larry D. wrote:
"The reason I wanted to try 5/8 wave is because I have had the Solarcon A 99 1/2 wave ground plane for 10 meters up for about 5 years and it is an excellent antenna for DX." OK. A comparison of unattenuated field strengths at one mile from various verticals is given on page 20 of the "Vertical Antenna Handbook" by Capt. Paul H. Lee, USNR, K6TS: 1/4-wave, 196 mv/m 1/2-wave, 236 mv/m 5/8-wave, 276 mv/m Power varies as the square of the voltage. One can see the difference in the field strength is hardly worth the effort for an amateur to try to increase the length of his antenna. It`s about a 3 dB gain from 1/4-wave to 5/8 wave. A 5/8-wave at 10 meters is 1/2-wave at 12.5-meters (24 MHz). A 1/2-wave at 10-meters is 0.4 wavelength at 12.5-meters (24 MHz). One could resonate it with a series capacitance at the antenna. Best regards, Richard Harrison, KB5WZI |
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