Title: Message
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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.
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.
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.
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!
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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