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Re: Feeding 1.2 meter offset dish for AO-40



Pieter,

Using your tape, how do you get to 50 ohm input impedence?  The wire a
tube users add a flat piece of copper parallel to the ground plane near
the feed. Can you and do you do the same with your tape helix?

Thanks,

Joel Kandel, KI4T

Pieter Ibelings wrote:

> Guys,
>
> Based on the radiation requirements and helix calculations by Howard
> G6LVB, I have designed a copper tape helix for the 1.2 meter dish. I
> decided to use 4.5 turns initially. The focal point is placed about
> 0.7 inches from the ground plane. I am going to give the antenna a
> try in a couple of minutes on AO-40. Here are some of the pictures.
>
> http://www.ozoni.com/n4ip/offset.html
>
> Pieter
>
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