[MLB-WIRELESS] Colorbond/roof insulation interference.

[Matt]

On the roofspace/colourbond topic....

if your willing (or able or allowed) to remove a sheet or two or colourbond 
then you could try replacing it with one of the fibreglass/plasticky type 
of roofing materials. Similar to the skylight option. As long as you do it 
away from any flashing or caps in the same position that the bit you 
removed was in then you should be fine (I've done this for a skylight on a 
pergola, so don't shoot me if I'm missing something). Sheets of this stuff 
come in standard sizes and its probably easier to do with the older style 
corrigated roofs.

At the least you might be able to find something thats less rf 
resistant(??) than metal. You'd have to experiment (I like the one with 
putting bits of plastic into the microwave) to get the best material and 
with any luck the best stuff wouldn't be bright pink.

Matt

At 11:44 PM 2/17/2003 +1100, Ben Anderson wrote:

>Interesting...
>
>Anyone know if you can take the attenuation of the colorbond into account in
>EIRP calculations?
>
>Cheers,
>Ben.
>
>
> > John said :
> >
> > >2.4GHz radio waves (as used in WLANs) will not propagate though metal.
> > >A colorbond roof will block any signal from an antenna in the roof space.
> > >(Possibly you will get a weak signal though the ceiling, but any decent
> > >singal will be a fluke.)
> >
> > Thanks. I didn't think it would work. In the interests of science I might
> > have a go and see what I get. :)
> >
> > >Typically an omni will have a null on it's axis, so an antenna directly
> > >below it will be in a favourable position.
> >
> >
> > So something like the below would work fine? Or would the omni need to be
> > clear of the galaxy overlap area?
> > (warning crappy ascii art ahead, not sure if it will work)
> >
> >
> > ()
> > ||
> > ||  <------ 6db omni
> > ||
> > ||    /
> > ||   /
> > ||  /    <---- overlap area!
> > || /
> > ||/
> > ()----------\
> > ()----------/     <--- ex galaxy
> > |\
> > | \
> > |  \
> > |   \
> > |    \
> > |
> > |
> > |
> > |
> > |
> > |     <---- Mast
> > |
> > |
> > |
> > ------------ <- roof
> >
> >
> >
> > Lucas
> >
> >
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> >
> >
>
>
>
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