[Lowfer] Antenna Design (off topic)

[Les Rayburn]

At 22:40 5/1/02 +0000, you wrote:
>HI Les,
>
>If you can tell me more about what you are starting with, I can design a
>proper yagi
>for this frequency.  I will need to know if maximum gain or directional
>discrimination
>is your objective. For example if you have a  station that will QRM you at
>90 degrees
>off heading, a yagi with a null at 90 degrees can be developed. There is a
>very good chance
>that the elements are way too widely spaced and will have to be moved.
>Either more elements
>can be added or the boom may be shortened. If you desire a direct 50 ohm
>feed, then I
>can design something with that in mind too, but often at a slight overall
>performance reduction.
>I need to know boomlength, boom diameter, element diameter, element to boom
>details.
>
>73, Jim Shaffer, WB9UWA.


Jim,

I had first thought about modifying the five element FM beam that
Radio Shack sells, but I think now that perhaps I'd be better off
homebrewing a three element beam.

I need a compromise between F/B ratio and forward gain.

50 Ohm feed would be good, but I think I can manage a
gamma match of some kind. Ideas?

Any help at all appreciated.

73,



Les Rayburn, N1LF
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