Re: NEC-LIST:Band width of Yagi

At 02:55 PM 6/16/02 +0200, Gilbert Mouget wrote:
> > HI All,
> > This is probably an old question but what is the bandwidth of a
> > YAGI. As far I know it is very small . Is there away of broadening the
> > bandwidth ? How much can one get ? For low Gain YaGI's (3 or 4 elements) Is
> > the bandwidth wider ?
>
>
> Bonjour,
>
>Here are ways to increase the bandwidth of a Yagi :
>
>1 - Increase elements diameter.
>2 - Increase the length difference between elements : longer reflector,
>shorter directors.
>3 - Use a log-yagi.
>
>How much bandwidth you can get depends, for practical reason, of your
>operating frequency. Obviously it is easier to increase the bandwidth
>at UHF than at HF.
>
>For a very large bandwidth you may need to use a log-periodic instead
>of a yagi.
>

There is another way, developed by Jim Breakall, WA3FET, and Nathan Miller,
NW3Z, called the OWA yagi. It gives a remarkable improvement in the SWR,
gain and F/B ratio bandwidths, and also permits a direct 50-ohm dipole
feed. See http://www.naic.edu/~angel/kp4ao/ham/owa.html

73, Pete N4ZR

Check out the World HF
Contest Station Database at
www.pvrc.org

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