Just remember that the folded dipole has about 300 ohms impedance at
resonance and needs to be fed with ladder line or a 6:1 balun.
At 02:16 AM 3/4/2007, Jeff Stevens wrote:
>On Sat, 2007-03-03 at 18:49 -0500, Dan Zimmerman N3OX wrote:
> > >A few folks recommended off-list to use insulated wire for the dipole.
> > >I'm considering using the copper-weld style copper plated steel wire
> > >for strength / conductivity. Is there anything similar that is
> > >insulated? I would have to insure the insulation is UV stable as well.
> > If you take W5DXP's suggestion to make a folded dipole out of ladder line,
> > you can purchase copper clad steel ladder line... then you've got good
> > insulation, the strength of copperweld, and an antenna that is
> naturally at
> > DC ground potential.
>Yes, thank you guys for this info. I wasn't even aware copper clad
>steel ladder line was an option. I've been looking a ladder line based
>dipoles today and I think this is the way I'll go. It took me a few
>minutes to figure out what you meant by an antenna that is naturally at
>ground potential. I see that with a good ground on one of the antenna
>leads a folded dipole has a low resistance path to ground throughout the
>entire antenna. Having never made a folded dipole, except for use on
>the commercial FM band (and I didn't even know that it was called a
>folded dipole at the time), my initial reaction was to shy away from
>this option. Looks like a winner in my situation.
>Along with a lightning arrestor to shunt possible surges on the center
>conductor of my transmission line and a solid earth ground on the shield
>I've come up with a paper sketch of my plans.
>The greater bandwidth of the folded dipole is a bonus too!
>73 - Jeff
>TowerTalk mailing list
Jim Rhodes K0XU
Experience is the thing you have left when everything else is gone.
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