Ho i guess you are talking about a spider pole not a beam? Look what is done in your country with poles:
http://www.comrod.com/getfile.php/Utvikling/AT101D_S%2023042009.pdf If the hat wires are to long, you end up with a kind of windom with "glassfever feedsystem. Best you modell it....before errecting.;-) 55/Lup DJ7SW Am 20.04.2011 17:11, schrieb Stein Roar Brobakken: > Hi > > We are going to install a 18m spiderbeam @ LA9TJA for use for 160m > > We been studying different top loading configurations, but we can't have the > wires stringed from the top because it will break the spiderbeam ;) > > So our plan was to take this 18m and have it high in a tree.. maybe have > totally 24 m or more vertical part feed via a loading coil or similar > network in the bottom 2 m above ground. > > 2nd plan was to have 2-3 wires out of the spiderbeam on level from 6 to 10 m > from bottom of the spiderbeam.. > There is then left about 12m to 8m of the vertical wire from this loading > wires VS the vertical remaining part of vertical wire.. > > After I my readings about vertical top loading the loading wires cannot be > longer then the vertical part ? > > In my opion is that the loading wires can't be placed too far down to the > vertical element, as I remember they have to be high as possible to "act" as > capacitive loading on the element... > Some guy wrote that the loading wires can be 1/8 wl maximum from the "end " > of the vertical element... but since we use this spiderbeam and it is not a > fully 1/4 wavelength on 160m... > Is it ok that we are mouting the loading wires 8m from the end of the > vertical part ( 10m from bottom of the spiderbeam) and 2-3 x 11 meter of > loading wires ? or should this loading wires be 7 m.. so they aren't longer > than the remaining vertical element ? > > I think we should shorten them so they are shorter then vertical element and > maybe have 3-4 of them... so we can have max vertical radiation.. > > > 73 LA6FJA Rag > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
