That's an odd way to look at things.
Your total output in 360 deg coverage area has nothing to do with dBi. dBi is merely
the gain of the antenna.
You don't take your radio power, add the gain of all the antennas that point in that
direction, and somehow spread the total out over all the receivers in that area. It
doesn't work that way.
You may have 360 deg coverage, but you have 2 separate systems, and you don't get to
add them together. In your case, you may have 360 deg coverage with 2 radios and 2
sectors, but at no point in your coverage area does either system have more than 12dBi
gain at the base station end.
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Rudolph Worrell
Sent: Sat 11/1/2003 1:02 PM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [smartBridges] Omni antenna coverage
Certainly you do not get to add the gain in one radio. When you put the
sectors together your total output in 360 degree coverage area is 24dbi. This is not
combined in anyway it is simply what you get when you look at how many dbi's you have
to cover the area that is intended.
I have 2 190 degree sectors back to back separated by about 5 ft Horizontally
on a water tower(200ft). One radio on channel 1 and the other on channel 11. This
works great for me and give me a coverage area of up to 15 miles without an amp. I
plan to introduce an amp which will most likely increase the coverage by about 5 miles
or so in open space.
-----Original Message-----
From: Jason Baugher [mailto:[EMAIL PROTECTED] Behalf Of Jason Baugher
Sent: Saturday, November 01, 2003 1:42 PM
To: [EMAIL PROTECTED]
Subject: RE: [smartBridges] Omni antenna coverage
Possibly, but the assumption is that with 2 sectors, each sector is on
a separate radio. Therefore you don't get to add their gains together.
As far as the mechanical downtilt on the omni, yes, you can do that,
but why would you want to, unless you are in the unique position of being on the side
of a mountain with people above and below you on the slope.
-----Original Message-----
From: Rudolph Worrell [mailto:[EMAIL PROTECTED]
Sent: Fri 10/31/2003 4:48 PM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [smartBridges] Omni antenna coverage
Yes! 2 190 degree sector gives you 380 overlapping coverage.
12dbi on one side and 12dbi on the other = 24dBi overall.
You can always tilt an antenna to create a down tilt. With an
omni you would lose coverage on the side you tilt away from.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Jason Baugher
Sent: Friday, October 31, 2003 5:35 PM
To: [EMAIL PROTECTED]
Subject: RE: [smartBridges] Omni antenna coverage
2 180 deg 12dBi sectors combine to make 24dBi in 360
deg?
Mechanical downtilt on an omni?
Maybe my brain is just fried, but something doesn't
add up here.
Jason Baugher
-----Original Message-----
From: Rudolph Worrell [mailto:[EMAIL
PROTECTED]
Sent: Friday, October 31, 2003 4:26 PM
To: [EMAIL PROTECTED]
Subject: RE: [smartBridges] Omni antenna
coverage
I only use Omni's at repeater sites with low
number of clients. I use 190 degree sectors for all serious connections. 12dbi in
180 or 12dbi in 360. Well I chose the 12 dbi in 180 each therefore giving me 24 dbi
coverage for 360 degrees.
On your Omnis you should get them with a 3
degree elec downtilt or use a mechanical downtilt. Electrical is better!
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL
PROTECTED] Behalf Of Rob Cleminson
Sent: Friday, October 31, 2003 5:13 PM
To: [EMAIL PROTECTED]
Subject: RE: [smartBridges] Omni antenna
coverage
I too am running with a 12dbi Omni at about
150â - customers at about 2-4km get a good signal but the closer you get the worse
the signal gets â I am about to swap out and try a 9dbi Omni to see if the RF
pattern improves for the clients that are closer. Failing this I will chuck the
omniâs and use sectored antennaâs
Rob
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL
PROTECTED] On Behalf Of Ian Ellison
Sent: 31 October 2003 14:57
To: [EMAIL PROTECTED]
Subject: Re: [smartBridges] Omni antenna
coverage
I am currently running airPointPro Outdoor
units with Comet GP24-3 Omni's, which is a 12 db antenna. I am servicing customers as
far as 5 miles away with sufficient results. However, the equipment is about 150'
above ground level which im sure helps. Good luck.
Ian
Derek Breiland wrote:
Up to this point I have been running off of
one tower with 3 sectors. I am looking at putting an addtional AP up about 6 miles
from this tower to penetrate into a community of homes that will otherwise be
difficult to cover due to the number of obstructions not to mention their elevation on
the map leaves a little to be desired. It will also enable me to install a less
expensive CPE at the customer site if I can bring the AP closer to the customer making
the service a bit of an easier sell.
I want to utilize an omni antenna in this
area. I have not yet decided what to backhaul with yet but I am considering an APPO
to the new XO2 at the remote. I can use one radio on the XO2 for the backhaul on one
channel and the other radio for the access to the customers. I am not a big fan of
repeaters unless absolutley necessary. It seems that most complaints on this site
have the word "repeater" in the paragraph so I will try and stay away from it.
My question is to anyone currently working
with onmi antennes on an AP. What ranges can I expect for the various dB omni
antennas? 9dB seems small to me, 12dB is maybe the ticket, 15db - way overkill? I do
not want the pattern to get too large to cause problems with my main tower. I am
looking at trying to get out no more than 3 miles for the AP. The AP and omni will be
mounted on a 40'-50' existing tower. Also has anyone had better results with one
manufacturer over the other with the same dB antenna?
Any suggestions are greatly appreciated. I
will be doing more and more of this so I would like to get it right the first time
based on others experiences in already doing it.
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