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Dan Richardson wrote in message . ..
On Mon, 17 May 2004 10:42:49 -0500, (Richard Harrison) wrote: [snip] 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. [snip] The 3 dB gain figure is valid when mounted on theoretical perfect ground. For a ground-plane elevated above real ground you'll find the gain to be rarely greater than 1 dB. Modeling 1/4 & 5/8-wave ground planes at 30 feet above ground (@ 24 MHz) as was described earlier NEC reports the following maximum gain: 1/4-wave 2.35 dB 5/8-wave 3.06 dB Then howcum my 5/8 wave mag mount 2m mobile antenna very significantly outperforms the 1/4 wave mag mount antenna I used to use? Same ground condx, same power, same feeder length, same vehicle, etc. I suspect it's in the differences in the TO angles. 73 Danny, K6MHE Brian w3rv |
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