To be sure about co-channel interference, shut down 2 of the 3 AP's and
test on the other one. Make sure to shut them all down, then bring up
just the one to test...
Down tilt should affect Tx and Rx about the same.
But you have more loss on the Rx than the Tx.
Are the arrestors polarized? i.e. marked with antenna and transmitter
ends? If so, are they in right?
Bypass the arresters, and see what happens. Or, remove the gas tubes
and see if that changes things.
Have you gone out and eyeballed the setup with some binoculars? Maybe
the installer did something stupid that you might notice?
When I've had massive imbalance Tx/Rx, it has always been either a bad
card or water.
Michael Baird wrote:
Gino, wisp-router.com, would the downtilt affect the AP RSSI level?
Antenna Height
ft
Downtilt Angle
°
Vertical Beamwidth
°
Results
Inner -3dB Radius 0.1 Miles
Sweet spot 0.2 Miles
Outer -3dB Radius 5.24 Miles
I told him 7.8, but I'm sure he didn't get dead on, just the best he
could with his inclinometer.
Regards
Michael Baird
Where are you running the calcs? I use
http://www.wirelessconnections.net/calcs/AntDowntiltCalc.as
With your input, I get main lobe 0.2 miles / -3db @ 7
Gino A. Villarini
g...@aeronetpr.com
Aeronet Wireless Broadband Corp.
tel 787.273.4143 fax 787.273.4145
-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Michael Baird
Sent: Monday, June 15, 2009 1:51 PM
To: WISPA General List
Subject: Re: [WISPA] Radio Seperation
Gino,
145', 15 degree VB, 7.7/7.8 puts my -3d at ~5 miles. If my downtilt was
wrong, I would think it would impact the receive on my CPE's, much more
then on the tower AP's, maybe that's a poor assumption on my part
though.
Regards
Michael Baird
I think your downtilt is too much, whats your area and tower height?
The beamwidth of the maxrad sector?
Gino A. Villarini
g...@aeronetpr.com
Aeronet Wireless Broadband Corp.
tel 787.273.4143 fax 787.273.4145
-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org]
On Behalf Of Michael Baird
Sent: Monday, June 15, 2009 1:29 PM
To: WISPA General List
Subject: Re: [WISPA] Radio Seperation
My sector's are Maxrad adjustable sector's horizontally polarized,
adjusted to 120/13db, at 7.7 - 7.8 downtilt, trying to cover a 5 mile
radius.
Radios, are Ubiquity 400mw radio's, I've turned down to 23/200mw.
CPE's, are Ubiquity PS2, same radio at 400mw, Horizontal antenna at 18
dbi.
RSSI at the CPE is great, RSSI at the AP is poor often different by
16-20 db.
I also mentioned the RFLinx Qwave lightning arrestors, this is the
first tower we've used them on.
Regards
Michael Baird
I don't think that this would be an antenna location issue.
What antennas did you use and where are they pointed?
Also, what output are the radios? If you use 600mw radios on the ap
side and 100 mw radios on the rx side it'll make a difference.
Also, having LOW power at the tx is almost always a good idea,
especially when colocated like this. I usually only run 15 to 17dB
at
the ap's. Most of my sectors are 13dB. Yeah, I have customers at 18
miles with multi meg RELIABLE service this way. There are other
customers at much shorter ranges that don't get reliable service, but
that's caused by other issues :-).
We run most of our cpe at pretty high power these days due to the
need
to blow through the overpowered competition or just over all noise
levels.
Anyway, what gain are the antennas and where are they pointed? How
much downtilt etc.
How far are the customers from the tower?
What polarity are the antennas? All the same, or did you mix it up?
What are the cpe radios? What power, what antennas etc.
If you had a 15 db transmit antenna and a 15 db transmit radio
shooting to a
15 dB panel at 5 miles you should see an rssi of, -83 or so. Legally
you could have 6 more dB at the AP side giving you around -77 at the
cpe 5 miles out.
Hope this helps!
marlon
----- Original Message -----
From: <m...@tc3net.com>
To: <wireless@wispa.org>
Sent: Saturday, June 13, 2009 1:09 PM
Subject: [WISPA] Radio Seperation
We've just installed a 3 sector 2.4 setup, at 145' with maxrad
120's.
I'm noticing the receive sensitivity on the AP's are about 15-20
db's
different then what I see on the CPE's, tried a Tranzeo/Ubiquity
radio.
I'm using Ubiquity AP's, and they work fine on another 3 sector
setup
I have, however this tower is an A-Frame. The tower owner won't
allow
outside climbers so his guy did it, and he put one on each leg at
145'
back to back. If the radios were too close together even on
different
channels, would the RX performance on the AP exhibit this behavior?
Only other change on this tower was RFLinx Quarter-wave arrestors in
line.
If I'm 3-5 miles away I can see on the CPE a RSSI of -65 to -75 for
example, on the AP the reading would be in the -90 to not even below
the noise floor.
Any thoughts would be appreciated as always.
Regards
Michael Baird
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