Re: [Paddlewise] telescoping whip..VHF

James Lofton wrote:

> MarcJensen wrote:
> >
> >
> > I have access to NiTi super elastic wire ...

> >If you want to play with it, try cutting it 17.5 inches long. ...

You want it resonant around 160 MHz, so a quarter wave is 18.5 inches. Velocity
factor is about .80 for small diameter wire, so .80 x 18.5 = about 15".

If you connect one piece to the center condutor of your cable, and two pieces
to the shield, pointed down at about a 45 degree angle, you'll have a very
effective ground plane antenna as described in the original Motorola patent.
Like so:

             |
             |
             |
             o
             o
            / \
          /     \
        /         \


--
Michael Edelman     http://www.mich.com/~mje
Telescope guide:    http://www.mich.com/~mje/scope.html
Folding Kayaks:     http://www.mich.com/~mje/kayak.html
Airguns:            http://www.mich.com/~mje/airguns.html


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