Kinds? um... I know coniferous vs. deciduous and a couple different
kinds of deciduous, but that's about it... Maple, crab apple, locust,
that's about it.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
----- Original Message -----
From: "CHUCK PROFITO" <[EMAIL PROTECTED]>
To: "'WISPA General List'" <wireless@wispa.org>
Sent: Friday, June 22, 2007 12:13 PM
Subject: RE: [WISPA] 5 GHz attenuation
No one talks of the type of trees. We've noticed getting through a line of
poplars, adjust antenna size, not much of a problem. But one pine tree, or
a well placed ash, near impossible. Maybe the pine needles attenuate more
because they are thin and in all directions thus absorbing all reflections
?? Anybody else see this.
Chuck Profito
209-988-7388
CV-ACCESS, INC
[EMAIL PROTECTED]
Providing High Speed Broadband
to Rural Central California
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mike Hammett
Sent: Friday, June 22, 2007 9:57 AM
To: WISPA General List
Subject: Re: [WISPA] 5 GHz attenuation
Could you provide some sort of numbers? How much loss does that 1/4 mile of
water-retaining trees have?
The town is basically a square with the tower on the far west side in about
the center. It is 1/2 mile to the extreme corners, so there are a lot of
people 1/4 mile and less.
Someone on another list mentioned water retention as a show-stopper, but my
limited experience had me thinking just about anything less than a 1/2 mile
would work.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
----- Original Message -----
From: "Graham McIntire" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Friday, June 22, 2007 11:25 AM
Subject: Re: [WISPA] 5 GHz attenuation
I have two towers running MT APs at 5.8 with CM9s and 16 dBi horiz
sectors. Using Osbridge 5GXi's as the CPE, I have clients a few miles
out with non-LOS and the occasional treeline without any issues.
I also have one house about 3/4 mile away from my tower that's going
through nearly 1/4 mile of scattered trees. It attenuates pretty
badly during heavy rain until the leaves on the trees dry out, but
stays connected. It's my parents-in-law's house, so they're a little
more forgiving if it happens to drop than a client would be ;)
Half a mile with scattered trees shouldn't be a problem for you, even
with snow/rain attenuation.
Graham McIntire
Verona Networks
On 6/22/07, Mike Hammett <[EMAIL PROTECTED]> wrote:
I have a 5 mile link where I'm not quite sure if the antenna is above the
trees or not as it is on top of a mast. That link is on the better side
of -80 for almost 2 years. Based on that I'd think I'd be okay at a half
mile or less. I figured that with most of the town at better than -60
and a
lot better than -50, I could stand to go through a few meters of tree,
but
that's why I came here to ask. ;-)
Based on the numbers on the site I looked at, 10 db of attenuation is 27'
of
foliage. That'd put 20 db at 55' of foliage.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Friday, June 22, 2007 10:22 AM
Subject: Re: [WISPA] 5 GHz attenuation
> Mike,
>
> Good to go as long as the TV towers allow you to get the CPE antennas
> above the trees.
>
> jack
>
>
> Mike Hammett wrote:
>> Most of my coverage area is open fields, so there isn't much to making
>> a
>> link work.
>>
>> I have an increasing demand to install an AP in a small town (no point
>> within town is further than 1/2 mile away from the tower site). I
>> prefer
>> to use 5 GHz due to the amount of spectrum available. An article I
>> read
>> said 1.5 db per meter of foliage or 20 db per tree in 5 GHz.
>>
>> The grain leg is 100 - 150 feet tall. Many houses have TV towers.
>> Radio
>> Mobile (not counting foliage) says the worst signal I can expect to
>> see
>> is in the 60s with most in the 50s or 40s.
>>
>> Safe to assume that most of the town will be good to go?
>>
>>
>> -----
>> Mike Hammett
>> Intelligent Computing Solutions
>> http://www.ics-il.com
>>
>>
>
> --
> Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
> FCC License # PG-12-25133
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> Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
>
>
>
>
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