[time-nuts] GPS antenna??

[gary]

If I'm following this correctly, we call that steel reinforced concrete 
in the US.

Some high end buildings use ICF made out of Neopor 2300, which is the 
best (or worst) of both worlds. The 2300 variant is infused with 
graphite, so it makes a Faraday shield, albeit not very low resistance, 
and then there is rebar in the design as well. [Best for strength and 
insulation; terrible for RF penetration.]

On 4/8/2013 10:25 PM, David J Taylor wrote:
> Hi David yes its ferro-concrete which makes quite a good screen (a lot
> worse
> than domestic brick) but the windows are not coated I think. (BT Labs at
> Martlesham)
> []
> The windows are SW I think but give a good view of a quadrant of the
> sky. It
> will be interesting to see how long it takes to lock up compared with an
> outside antenna.
>
> Thanks and Best Wishes
> Alan
> G3NYK
> =================================
>
> Alan, I can imagine that a commercial building may provide more
> attenuation - never been to Martlesham Labs myself but have been in
> similar buildings.  One small point - will you need to tell the unit
> that it has moved, or will it recognise that for itself?
>
> Good luck with your meeting!
>
> 73,
> David GM8ARV