[MLB-WIRELESS] Helical Antennas & Interferance & Corkscrews

[rik]

why not set it at a 45degs polirization?
get the best noise of both worlds just half as much!



----- Original Message ----- 
From: <bchild at wireless.org.au>
To: <melbwireless at wireless.org.au>
Sent: Tuesday, July 01, 2003 10:48 AM
Subject: Re: [MLB-WIRELESS] Helical Antennas & Interferance & Corkscrews


> Have had a similar experience with circular polarisation antennas, where
> they tend to do a little better, you most likely would find that other
> things on vertical & horizontal polarisations would cop more interference
> from the circular then the other way round.
>
> Tony might be able to answer that 1 better, personally I think it's
> because the circular antenna is expecting a circular directed wave.  Not
> sure bout the actualy works of it all.
>
> is basically the same as if u tilt ur antennas they work better being out
> of phase or to the norm then when they are set in the normal way.
>
> > Can anyone enlighten me as to their experiences with Helical antennas
> > and their performance with regards to interferance.
> > http://www.wireless.org.au/~jhecker/helix/
> >
> > As I understand it, they have a circular polarisation like a corkscrew
> > effect.  Does this allow it to pickup more interference as I'm guessing
> > it would pickup horizontal and vertical....and everything in between?
> >
> > I'm trying to establish whether these would be a better option for inner
> > city links where there is a high 2.4Ghz noise floor.  Particularly
> > around a certain very tall structure I mentioned yesterday. *cough*
>
> Regards Glen
> (Node AAD)
>
>
>
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