Enemy at the Door

David Honig honig at sprynet.com
Thu Nov 8 09:08:06 PST 2001


At 11:45 PM 11/7/01 -0600, Harmon Seaver wrote:
>     Go tell that to the Seattle/Portland/wherever wireless people. Or the
>people in rural MN who are putting them up on silos and running a 10 mile
>radius. Totally depends on your topography. And even with p-p they aren't
>doing parabolics, more like yagi directionals, which could be just another
>TV antenna, cut to the harmonic.
>      Gee, maybe they'll start raiding home with TV antennas.
>

The pages about 'pringle's chip canister yagis' show a piece of plumbing PVC
enclosing the final package, a tube about the size of an arm.  It
doesn't look like a TV antenna, more like the microwave uplinks (Funny that.)
from mobile tv vans, though those are usually helical.  

So the Ghz yagi is readily hidden.

The 802.11 hacks claim a good 15 db with a homemade yagi.  I think the RF
deal is that you can't scale a yagi as far as you can a dish -past some
number of segments the yagi doesn't give you more, but a dish keeps on
giving  
(Areceibo for instance...) if you have the space for it and can take the wind.
















 






  








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