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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