Whats the lenghs of the cables? They could be acting as antennas themselves.
Kurt Fankhauser
WAVELINC
P.O. Box 126
Bucyrus, OH 44820
419-562-6405
www.wavelinc.com
-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of os10ru...@gmail.com
Sent: Sunday, May 03, 2009 8:52 PM
To: WISPA General List
Subject: Re: [WISPA] Sector separation/isolation
What kind of cable are you using between the APs and the antennas?
On May 3, 2009, at 8:27 AM, Michael Baird wrote:
Yes, I tried the 10mhz/5mhz channel widths, per recommendation, the
AP's
still saw each other at similar signal strengths (w/antenna). I will
see
if I can check the rest of the stuff, there is no vertical separation
either as another recommended, the antennas themselves are at least 20
foot apart. They are on 3 sides of a water tower, with the water tower
in between. I didn't install the equipment and haven't been up on the
tower, so I can't say firsthand how it has been installed. Can you
give
me a rundown of how it should be installed, so I can know what to look
for. Defective antenna is an idea though, they are Tranzeo 120's, the
sectorization barely works at distance. I can see all 3 AP's at each
sector 7 miles away, can peer with two of them, associate with all
3, I
think this is wrong. I think I should only see one, unless I'm at the
overlap point.
Regards
Michael Baird
The problem of the APs seeing each other could be due to unusually
high signal leakage (defective antenna, coax, enclosure etc resulting
in poor shielding/signal leakage). If that's the case the equipment
should be performing better than it is (less mutual interference) and
for some reason it's not. You'd have to investigate and/or swap out
gear to find the problem.
Or is it that the equipment and install are all good and this is
normal due to the proximity? If it's proximity then physical
separation and/or frequency separation is the only thing that will
help, hence the suggestion of using narrower channels and moving the
antennas from previous posts.
Did you try going to 10 MHz channels?
Can you disconnect the antenna and put dummy loads on the ends of the
coax and see how strong the APs can see each other? If the problem
goes away then it's either a) defective antennas with too much
leakage
or side/rear lobes) or b) antenna proximity.
Greg
On May 3, 2009, at 7:13 AM, Michael Baird wrote:
I think I didn't explain my problem clearly. 10mhz/5mhz channel sep
makes no difference on how each AP see's each other on a site survey
on
the tower. I want to isolate the sectors from each other in a
better
way, they are too hot to each other and too much overlap. I was
looking
for good ways to do it, I have no noise problems to clients, and my
channels on the 3 AP's are 1/6/11, none overlapping, and all with
-100
noise floor's.
Regards
Michael Baird
Right now channel 1 uses channel 1, 2 and 3. Channel 6 uses 4-8.
When
you go to 10MHz channels 1 will use 1 and 2. 6 will use 5, 6
and 7.
Therefore, you are no longer on adjacent channels, there is a gap
of
channels 3 and 4 between.
Also, you will cut down on the amount of other noise you hear
because
you listen to only half as much spectrum.
And, you will have more effective power so noise may be less of a
problem.
I am sure there are some RF savvy folks out there that can
explain it
better.
Michael Baird wrote:
I can try that, can you tell me why that would make a difference
though
with the AP's seeing each other at such signal levels? Will
changing to
10mhz channel width's cause the AP's to see each other at a lower
RSSI?
Regards
Michael Baird
Use 10mhz channels instead of 20mhz.
Kurt Fankhauser
WAVELINC
P.O. Box 126
Bucyrus, OH 44820
419-562-6405
www.wavelinc.com
-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-
boun...@wispa.org] On
Behalf Of Michael Baird
Sent: Saturday, May 02, 2009 6:54 AM
To: WISPA General List
Subject: [WISPA] Sector separation/isolation
We are still experimenting with aligning sector's on our towers.
We are
attempting to use 3 120 degree/13db/6.5 vb/7 degree downtilt,
antennas
to cover 360 degrees. I just inspected the towers myself, and
noticed
they are setup at 30 degrees/150 degrees/290 degrees (so they
aren't
right exactly). So the problem that caused me to inspect the
tower was
the signal level I can see the other AP's at.
AP 30 can see AP 150 at -39 and AP 290 at -42.
AP 150 can see AP 30 at -42 and AP 290 at -70.
AP 290 can see AP 30 at -39 and AP 150 at -65.
So I'm guessing that the reason 150/290 are much higher is
because of
the additional 20 degrees between them. These AP's are on
channels
1/6/11, I'm wondering if I should worry about seeing the other
AP's with
such a hot signal, and if so what are some good ways to isolate
them better.
Regards
Michael Baird
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