[TriLUG] slight OT: multi-band cell booster
Joseph Mack NA3T
jmack at wm7d.net
Mon Jun 27 13:12:36 EDT 2011
On Mon, 27 Jun 2011, David M. wrote:
> My CEO has a place in Martha's Vineyard which is
> apparently fairly remote. He has both AT&T And Verizon 3G
> type connectivity at his house but the signals are weak.
Here's a cheap solution that may not fit a CEO's
temperament. I expect Chris' is better in that respect.
My FiL's house in ME has a similar problem. For wifi access
to a wap across a bay (1/2 to 1 mile away), I use a standard
piece of foam board insulation (8'*4', like sheet rock
except blue foam) with aluminum foil on one side as a
reflector. To make it pseudo parabolic, I make lengthwise
(8' long) cuts on the foam side almost through to the
aluminum backing and then crack open the cuts. Here's the
board from above
The arms of the parabola are about 1.3' long
I sit my laptop on a table at the "x" and adjust its
location for max signal. I get about 3db gain, enough to
dhcp and keep the link up.
o freq insensitive
o need to position the laptop correctly (at the focus) and
point the parabola at the cell tower. Presumably the CEO
would have to sit in the right place to make phone calls.
o your body blocks the aperture. I sit to the side.
Presumably you could have a squint geometry instead.
to work as a parabola, the dimensions of the surface have to
be large with respect to the wavelength. It would be better
to have turned the board sideways and make the cuts across
the short side making the arms 2.6' long
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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