It works much like 900Mhz, in other words, you never REALLY know until
you put the link up ;) I know that is not what you wanted to hear but
honestly I have had links, both 2.4 and 5Ghz that I have said no way
on, but they have worked quite well, and I have had others that for no
apparent reason just plain suck (most likely a reflection somewhere is
causing the issue and moving them around helped).
At a 1/2 mile you should be pretty good if you generally can see the
tower, but if you are shooting through a tree more often then not, you
really should consider 2.4 or 900 quite honestly.
One of the biggest things I learned about dealing with trees over the
last 3 years is that they grow (duh! :) What works okay this season can
really suck next season. There is nothing more frustrating than trying
to troubleshoot a connection that has been rock solid for the past year
and a half and now sucks. You finally go to the house thinking you have
a radio problem, crawl up on the roof and realize that you can no longer
see the AP. If you're lucky you can move the CPE to somewhere else on
the roof.
Sam Tetherow
Sandhills Wireless
Mike Hammett wrote:
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.
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>
>
>
>
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