I to can kick in some experience here! I mounted an omni one time on top of
a building on a tripod. I shoved the Omni as high as I could reach to push
it up(hehehehe not to high) on the mast and tightened it down. The omni was
not as tall as the mast and was mounted about 3" off the mast. I checked it
out about a week later and noticed that it always had 900kbps of traffic on
the wireless interface even though there was no ethernet traffic (mrtg
graphs via SNMP) and it really puzzeled me. After stewing over it I decided
it was either a bad radio card or that stinking mast beside the omni - - it
was the mast :-)
Moral of the story = get some distance from whatever is close!
Mac Dearman
Maximum Access, LLC
www.inetsouth.com
www.radioresponse.org
----- Original Message -----
From: "Tom DeReggi" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Thursday, February 16, 2006 8:42 PM
Subject: Re: [WISPA] omni tower separation
I can tell you from experience, mounting it at 6 inches is not a good idea.
We did that once, in a rush job, when the climbers were there and mounting
hardware was not. Definate holes in coverage were identified after the
fact.
The answer of how far from the tower, is also a factor of how big your
tower is, and of what kind.
I recommend 18"-24". As for Rick's suggestion of 36", never tried it, so
don't know, but I see no reason not to take his word for it.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Rick Smith" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Thursday, February 16, 2006 7:47 PM
Subject: Re: [WISPA] omni tower separation
actually, at 900 mhz, 36" is preferred.
On one tower, with trango, using an OD9-11 (11 dbi vert omni), I saw 8-10
db improvements in my customer connections that were NLOS when I moved
the antenna out from 24" to 36"....
Marlon K. Schafer wrote:
I've always been taught that 18" is the minimum.
marlon
----- Original Message -----
*From:* Kurt Fankhauser <mailto:[EMAIL PROTECTED]>
*To:* wireless@wispa.org <mailto:wireless@wispa.org>
*Sent:* Thursday, February 16, 2006 10:12 AM
*Subject:* [WISPA] omni tower separation
Is 6 inches enough separation with a 9db omni from a 25g tower?,
I’ve done it with 12 before and I had no problems, just wondering
what 6 would do.
Kurt Fankhauser
WAVELINC
114 S. Walnut St.
Bucyrus, OH 44820
419-562-6405
www.wavelinc.com <http://www.wavelinc.com>
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