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#4
June 28th 07, 12:44 PM
posted to rec.radio.amateur.antenna
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Suggestions please - portable antenna for camper van
wrote:
By using a vertical wire of a suitable magic length (7.2, 8.8 or 11.8m) supported by the fishing pole, I can get the LDG tuner to provide a good match on all Amateur bands from 80m upto 6m as the impedance presented to the tuner is just within it's (slightly limited) matching range. When a vertical monopole length is much longer than 5/8WL, the take-off-angle increases and much of the radiated RF is lost into space on the higher frequencies. For instance, on 6m using the 7.2m monopole, the take-off-angle is ~56 degrees. 7.2m is ~5/8WL on 12m, not good for 6m-10m. 8.8m is ~5/8WL on 15m, not good for 6m-12m. 11.8m is ~5/8WL on 17m, not good for 6m-15m. -- 73, Cecil http://www.w5dxp.com |
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