Re: [TowerTalk] new Steppir antenna

[VR2BrettGraham <vr2bg@harts.org.hk>]

N6RK replied to W6RMK:

> I wanted to modify a 2 element SteppIR Yagi (the regular one)
> for 30 meters (as a dipole).  Since I would be running only 100 watts, the
> voltage was "only" a coupla thousand volts.  The scheme might
> have been workable (not easy but workable) if it weren't for
> the 25 pF of shunt capacitance.  With a couple of thousand
> volts across this "capacitor", the "dielectric" would probably
> be toast.

Put some end loading on the SteppIR, using something like those
rods that Cushcraft has on the base of the R5 & R7.  Replace the
plastic end bit on the end of the BeCu strip with a spring that is
electrically connected to the strip, so when cranked out to below
14 Mc, the spring can push up against something connected to
the rods & bingo, rotary dipole reasonant somewhere around 8
Mc when I modelled it.  Some light Kevlar line to truss the element
would probably be necessary.

Hows that sound?

73, VR2BrettGraham

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