[TowerTalk] Dipole fed with balanced line?

[caraj at cox.net]

John:
I have a set up similar to your dimensions with the middle half of the ant passing over the roof.
I use Radio Works classic North Carolinia 80 M - 10M Windom Ant about 133' long, 67% offset. There are 2 baluns in it which can help the RFI problem (If caused by the antenna).
The shack is 12 feet directly below the stub feed point, 30 feet below the top balun feed of the 133 length. The ant top is 50' above ground. With 600 watts PEP there is no RFI in a shack full of transceivers, lots of quality test equipment
and many antennas. The house has 4 laptops, 2 high speed servers fancy hi fi and wireless TV/Web. No RFI from this antenna.
It routinely gets 59+ in N., S. America and Europe. The first time I joined a national net I was requested to do a call for NCS to find more stations. For the far east on 20M I go to the beam. The home is at the lower part of hills where the brook flows.
On your property I would turn the short leg of the above 7 feet down at your tree or compromise to the keep the center as high as possible. My ant is turned down 10 feet at each end but the feed point is sitting pretty at 50 feet. The ant is fed through a tuner which is switched out since the SWR varies from roughly 1.1 to 2.5 on band extremes.
Talk to me directly if you 4Mhz. is critical to you.
Good luck,
John, K2SFS, caraj at cox.net
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---- Jim Miller Waco Texas WB5OXQ <wb5oxq_1 at grandecom.net> wrote:
> I must move my 40 and 75 dipoles due to rfi in the house that I cannot resolve. I am thinking about 1 dipole fed with ladder line or window line. I have 2 possable support points.
> 1 pair is 126' from end to end and 50' high at one end and 30' at the other. Second pair 139' apart but 25' at one end and 30' at the other. The longer but lower is farther from the house by about 10' and runs over level yard with no obstructions. What is up with the 130' dipole fed with balanced line? Is this better for a multiband antenna than using 1/2 wave at the lowest desired freq? I have a MT-3000A Dentron tuner which is supposed to work with ballanced line. The maximum power I run is 800 watts rms not pep.
> Suggestions please. I have never used a dipole fed with balanced line. Will the window line take 800 watts or should I get the open wire feeder? I really only need this antenna to work on 75 and 40. I use my triband beam for 20+. How do you bring this line into the shack? Obviously it cannot touch anything metal along its run. Is the length of the feeder critical?
> Should the wire be long as possable or 1/2 wave at the lowest desired frequency? (3.9mhz)
> wb5oxq
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