Ahhh. I tried one or two of the sl units. Just ordered some more. I like
them so far.
Think of multipath like a bad echo. If you've even stood in a completely
empty BIG room, like a grain elevator, warehouse etc. you know that it can
be hard to carry on a conversation with someone. The sound waves just keep
bouncing around and around and around.
OFDM likes the echos, most anything else doesn't.
thanks,
marlon
----- Original Message -----
From: "Jim Stout" <[EMAIL PROTECTED]>
To: "WISPA General List" <[EMAIL PROTECTED]>
Sent: Friday, April 13, 2007 7:36 AM
Subject: Re: [WISPA] Power Lines in the LOS path
Thanks to all for the feedback!
I moved the radio to the top of the customer's barn and am now "looking"
over the power lines. When I first fired it up, it wouldn't associated,
so I started trying some of the other suggestions. I lowered the maximum
transmit power substantially and it actually started to work. Once it
associated, I was able to see the dB level at the AP so I continued
dropping the CPE power until my receive power at the AP was -70 dBm. I
also reduced the MTU to 500 and the max speed to 5 Mbps. The customer
hasn't used it much but my SNMP queries have all been succesful since 9:00
last night.
Marlon,
The SL2 is one of the newest radios from Tranzeo. It's part of the CPQ
family, but it's a Slim Line (much smaller in size.) Up until this
install, they have gone in easy, and run great! Can you explain the
"multipath" phenomenon?
Thanks, Jim....
Jim Stout
LTO Communications, LLC
15701 Henry Andrews Dr
Pleasant Hill, MO 64080
(816) 305-1076 - Mobile
(816) 497-0033 - Pager
----- Original Message -----
From: "Marlon K. Schafer" <[EMAIL PROTECTED]>
To: "WISPA General List" <[EMAIL PROTECTED]>
Sent: Wednesday, April 11, 2007 8:40 AM
Subject: Re: [WISPA] Power Lines in the LOS path
Yeah, that sounds like multipath. I've seen that a few times.
Your signal level is actually much too high.
Try two things to test my theory.
Turn the antenna backward. That should cut 15 to 20dB of signal off and
get you down into the high 60 to mid 70 rssi range. Much more
reasonable.
Try cross polarizing this cpe. If the tower is vertical, put the cpe
hpol.
Also, what's the radio? (sl2 isn't one I've heard of, cpq or cpe I know
of)
How about the AP? I've got some very strange things happening with SB
ap's and Inscape Data or the new Tranzeo CPQ radios. They will just stop
talking to each other. In fact the cpe won't even see the ap until the
*ap* is rebooted! It's the dangdest thing. It's almost like the cpe is
being put on a mac filter list and the ap completely ignores the cpe. No
cpe mac filter being used though. I've had this happen on different
networks with different towns, different upstreams, different antennas,
different cpe etc.
The old CPE200 units didn't do this. Just the new cpq and inscape data
cpe radios.
laters,
marlon
----- Original Message -----
From: "Jim Stout" <[EMAIL PROTECTED]>
To: "WISPA General List" <[EMAIL PROTECTED]>
Sent: Wednesday, April 11, 2007 4:42 AM
Subject: [WISPA] Power Lines in the LOS path
I hate to ask this question, but I'm at my wit's end with this one.
I recently installed a new customer (2.4 GHz) with a clear LOS to my
tower. The distance is less than a mile and I get -56 dBm of signal
strength. I've run a spectrum analyzer and it's dead silent when the
radio's off.. All sounds great! A real simple install, but the radio
intermittently locks up, fails to associate and most recently, simply
fails to work for more then 10 - 30 seconds at a time following a POR.
I've replaced radio (Tranzeo SL2) and gone to the latest version of
firmware. I even contacted Tranzeo Tech Support and follwed their
recommendations for timing settings. The only difference between this
client and all the others on my tower is that there is a power line in
the LOS path. Has anyone else found this to be a problem? It's almost
like an invisible concrete wall is between the AP and the site.
Thanks, Jim....
Jim Stout
LTO Communications, LLC
15701 Henry Andrews Dr
Pleasant Hill, MO 64080
(816) 305-1076 - Mobile
(816) 497-0033 - Pager
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