So just use OFDM EVERYWHERE!! :-)
On 4/13/07, Marlon K. Schafer <[EMAIL PROTECTED]> wrote:
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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