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Hi Richard thx for the reply but in thinking it over it would seem an
unlikely possibility that I could accurately model the 5-BTV with it's traps. Did I miss something there? -- Charlie Ham Radio - AD5TH www.ad5th.com Live Blues Music www.492acousticblues.com "Richard Harrison" wrote in message ... Charlie wrote: "Using a Hustler 5-BTV ground mounted with 72 radials. I have heard about antenna modeling but is there a way to do a real world take off angle measurement?" Make a small physical model. Then use a field strength meter without a helicopter. Best regards, Richard Harrison, KB5WZI |
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Charlie wrote: Hi Richard thx for the reply but in thinking it over it would seem an unlikely possibility that I could accurately model the 5-BTV with it's traps. Did I miss something there? Hi Charlie, A 5-BTV with 72 radials will have about the same take off angle as a full size vertical with 72 radials on a given band. This is assuming the 5-BTV is operated as a 1/4 wave, current fed vertical on all bands. If it is used as something else, say a 1/2 wave voltage fed vertical on a given band, then the TOA should be about the same as a full size 1/2 wave vertical. As you can tell by other posts, actually measuring the TOA will be difficult. If you could model full size versions of the 5-BTV on the bands of interest on a program such as Eznec, you could find out your TOA. As Reg asked, when you do find it out, what are you gonna do then? Gary N4AST |
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