What's with all the question marks on the spec sheet?
Brian, we see this more and more. Low traffic sites will do many things
well because there just isn't any RF when there aren't many customers. So
tests work very nicely....
Antennas are a HUGE part of what makes your network tick. Cheap ones will
bite ya in the tail every time. ESPECIALLY when there are many others
around.
The rule of thumb is that you should keep your antennas at least 10' apart.
Alvarion did a test a few years back. On the same roof with the same ap's
they used 3 or 4 different sectors. With the high end ones (read $$$$$$)
they could get as close as 6' before the radios started to take a lot of
errors. With the cheap ones they had to have 15 feet! Antennas were the
only things changed. This test was done at a wisp but by the factory techs.
I'll bet Patrick or Brad would remember more specifics.
If you aren't sure if that's the case you should just try moving one of the
sectors as far away as you can get. If that helps, you know you are onto
something.
I've been pulling out my $120 Maxrad sectors and putting in the $400 Maxrad
ones. ALL 4 of the sites that have the cheaper ones do strange things.
Reliability is wayyyyy below my other sites. Swapped the first one out the
other day, we'll see how things go. The worst part of it is that they seem
to affect the systems around them in a bad way too.
As an FYI, I do NOT buy antennas, from anyone, that are hard to weather
seal. There's just no reason for those guys to give us anything that we
have to fight with.
Going through trees etc. will cause all manner of strange things. The only
way to really know if that's your problem vs. the other one is to shut two
sectors down and see if that makes the one sector work better. If not, then
you have an outside source of interference, too much nlos, too many
customers for the system, bad antennas or something. If shutting the others
down works, then you can be pretty sure you need to redesign the tower or
replace a bad antenna or three.
Hope this helps,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: "Brian Rohrbacher" <[EMAIL PROTECTED]>
To: "Conversations over a new WISP Trade Organization" <wireless@wispa.org>
Sent: Sunday, February 12, 2006 10:22 AM
Subject: [WISPA] 120* Sectors
Here is what I use.
http://www.demarctech.com/products/reliawave-antennas/2_4Ghz/DT-AN-24-120H-135.html
I have three mounted back to back on a pole. It all worked fine until I
hit a higher number of subscribers. Maybe it's the interference from too
many subs or maybe it's the fact that a majority of my subs are locked
into 1M air rate, or maybe its because the subs are NLOS, or maybe because
of the F/B or side to side isolation. So what is my problems? High pings
and timeouts. Only when traffic is high. Or maybe my 600k upload is
maxed out and everything is stacking up. One thing I do know is I hooked
up subs I shouldn't have.
I am looking for advice on antennas. Check out the ones I am using ans
point me to 3 sectors that will perform good back to back, NLOS, and maybe
a higher gain to grab a little more signal to get the 1M subs up to 11M.
Thanks all.
--
Brian Rohrbacher
Reliable Internet, LLC
www.reliableinter.net
Cell 269-838-8338
"Caught up in the Air" 1 Thess. 4:17
--
WISPA Wireless List: wireless@wispa.org
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
--
WISPA Wireless List: wireless@wispa.org
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
