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Wimpie wrote in news:1188313351.276557.292100@
22g2000hsm.googlegroups.com: clipped... a nice description of an end fed vertical half wave with matching network. Wimpie, I think the OP had using the stationmaster radiator element unchanged on lower HF bands. You could view this as a 5.5m long radiator sitting on say, a 4m metallic support mast, fed at the junction of the two. Typically the configuration involves no radials at the base of the 5.5m radiator, and an shabby connection to earth at the base of the supporting mast. If at 80m you were to assume the earth resistance was as good as 30 ohms, the earth loss alone would account for 60% of the power reaching the feedpoint when the antenna is modelled without provision for current on the outer of the feedline. So, the StationMaster as described in the article is typically a ground mounted ~1/8wl vertical with an inadequate ground system, elevated feed, high sensitivity to noise, highly susceptible to RF in the shack unless the feedline is decoupled adequately. It is a little better on 40m, but all of the issues remain. A lot of the guys wanting to do such a thing are our new six hour hams, and they would be principally interested in 80 and 40m. Owen |
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