Wireless over 10+ miles (Mr. Bandel?)

[David Bandel]

On 10/13/06, Shawn Tayler <stayler at xmtservices.net> wrote:
> On Thu, 12 Oct 2006 12:51:30 -0500 "David Bandel" <david.bandel at gmail.com>
> exclaimed:
>
[snip unrelated material]
>
> One thing to remember is that coax cable has loss.  At 2.4Ghz its really
> lousy.  So, unless you want to invest in some very large diameter heliax
> say 1-1/4 or 1-5/8, LDF6 or 7 to get you losses down, I would suggest
> putting your wireless bridge as close to the antenna as possible, in a
> rain resistant shielded box.  Run power and the ethernet up to it, the
> loss is markedly lower for these signal types.  I also recommend proper
> grounding of the tower as well as the shields of the lines as they leave
> the antenna, tower, and enter your building.  A good line surge
> suppressor(s), Polyphaser has a good line, along with another low
> impedance ground run to the suppressor, I mount mine on a 4in by 18in by
> 1/8" copper plate.  I use 02 copper or 3-6 in copper strap to the  single
> point ground ring in the dirt outside.

LMR-400 in the 2.4GHz range looses 6.66db/100 feet.  If he uses the
outdoor box and antenna I recommended, a 1 meter (3 ft) cable is more
than long enough.

The tower must be grounded.  There are two ways to look at the
antenna, and I use bothe depending on the circumstances:
1.  ground everything as above.
2.  isolate everything, but only have 12v from a battery coming onto
the tower, all signal comes and goes via wireless

I use #2 in high lightning areas.  Works great.  Make sure you
disconnect the charger output to the battery from ground so it's
isolated.  Then be _very_ careful or you might get it "bit" working
around the system.

>
> Works fine and lasts a long time.

Years and years.

Ciao,

David A. Bandel
-- 
Focus on the dream, not the competition.
            - Nemesis Air Racing Team motto