harrogate
July 2nd 03, 09:08 AM
"Pellucid" > wrote in message
...
> Yes, though not very directional (about 2.5dB's of directional gain)
> .
> Diphthong > wrote in message
> om...
> >
> > Are four stack folded dipoles close to a mast
> > really directional enough to be used in sectors?
> >
> > The signal strengths were pretty much indentical in most
> > directions around the sites
> >
Beg to differ. A single sided four-stack projects a response somewhat like a
flat-backed cardiod and will have an overall gain of about 9dB. The
effective coverage is almost +/- 90deg of the pointed direction.
If they want directionality the only option is either a yagi with 3 or more
elements, or a corner refelector.
Generally speaking you need to be some distance from the antenna before you
can see the effects of the directionality.
--
Woody
...
> Yes, though not very directional (about 2.5dB's of directional gain)
> .
> Diphthong > wrote in message
> om...
> >
> > Are four stack folded dipoles close to a mast
> > really directional enough to be used in sectors?
> >
> > The signal strengths were pretty much indentical in most
> > directions around the sites
> >
Beg to differ. A single sided four-stack projects a response somewhat like a
flat-backed cardiod and will have an overall gain of about 9dB. The
effective coverage is almost +/- 90deg of the pointed direction.
If they want directionality the only option is either a yagi with 3 or more
elements, or a corner refelector.
Generally speaking you need to be some distance from the antenna before you
can see the effects of the directionality.
--
Woody