Whats the lenghs of the cables? They could be acting as antennas themselves.

Kurt Fankhauser
WAVELINC
P.O. Box 126
Bucyrus, OH 44820
419-562-6405
www.wavelinc.com
 
 

-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of os10ru...@gmail.com
Sent: Sunday, May 03, 2009 8:52 PM
To: WISPA General List
Subject: Re: [WISPA] Sector separation/isolation

What kind of cable are you using between the APs and the antennas?

On May 3, 2009, at 8:27 AM, Michael Baird wrote:

> Yes, I tried the 10mhz/5mhz channel widths, per recommendation, the  
> AP's
> still saw each other at similar signal strengths (w/antenna). I will  
> see
> if I can check the rest of the stuff, there is no vertical separation
> either as another recommended, the antennas themselves are at least 20
> foot apart. They are on 3 sides of a water tower, with the water tower
> in between. I didn't install the equipment and haven't been up on the
> tower, so I can't say firsthand how it has been installed. Can you  
> give
> me a rundown of how it should be installed, so I can know what to look
> for. Defective antenna is an idea though, they are Tranzeo 120's, the
> sectorization barely works at distance. I can see all 3 AP's at each
> sector 7 miles away, can peer with two of them, associate with all  
> 3, I
> think this is wrong. I think I should only see one, unless I'm at the
> overlap point.
>
> Regards
> Michael Baird
>> The problem of the APs seeing each other could be due to unusually
>> high signal leakage (defective antenna, coax, enclosure etc resulting
>> in poor shielding/signal leakage). If that's the case the equipment
>> should be performing better than it is (less mutual interference) and
>> for some reason it's not. You'd have to investigate and/or swap out
>> gear to find the problem.
>>
>> Or is it that the equipment and install are all good and this is
>> normal due to the proximity? If it's proximity then physical
>> separation and/or frequency separation is the only thing that will
>> help, hence the suggestion of using narrower channels and moving the
>> antennas from previous posts.
>>
>> Did you try going to 10 MHz channels?
>>
>> Can you disconnect the antenna and put dummy loads on the ends of the
>> coax and see how strong the APs can see each other? If the problem
>> goes away then it's either a) defective antennas with too much  
>> leakage
>> or side/rear lobes) or b) antenna proximity.
>>
>> Greg
>>
>> On May 3, 2009, at 7:13 AM, Michael Baird wrote:
>>
>>
>>> I think I didn't explain my problem clearly. 10mhz/5mhz channel sep
>>> makes no difference on how each AP see's each other on a site survey
>>> on
>>> the tower.  I want to isolate the sectors from each other in a  
>>> better
>>> way, they are too hot to each other and too much overlap. I was
>>> looking
>>> for  good ways to do it, I have no noise problems to clients, and my
>>> channels on the 3 AP's are 1/6/11, none overlapping, and all with  
>>> -100
>>> noise floor's.
>>>
>>> Regards
>>> Michael Baird
>>>
>>>> Right now channel 1 uses channel 1, 2 and 3.  Channel 6 uses 4-8.
>>>> When
>>>> you go to 10MHz channels 1 will use 1 and  2.  6 will use 5, 6  
>>>> and 7.
>>>> Therefore, you are no longer on adjacent channels, there is a gap  
>>>> of
>>>> channels 3 and 4 between.
>>>> Also, you will cut down on the amount of other noise you hear  
>>>> because
>>>> you listen to only half as much spectrum.
>>>> And, you will have more effective power so noise may be less of a
>>>> problem.
>>>>
>>>> I am sure there are some RF savvy folks out there that can  
>>>> explain it
>>>> better.
>>>>
>>>> Michael Baird wrote:
>>>>
>>>>
>>>>> I can try that, can you tell me why that would make a difference
>>>>> though
>>>>> with the AP's seeing each other at such signal levels? Will
>>>>> changing to
>>>>> 10mhz channel width's cause the AP's to see each other at a lower
>>>>> RSSI?
>>>>>
>>>>> Regards
>>>>> Michael Baird
>>>>>
>>>>>
>>>>>
>>>>>> Use 10mhz channels instead of 20mhz.
>>>>>>
>>>>>> Kurt Fankhauser
>>>>>> WAVELINC
>>>>>> P.O. Box 126
>>>>>> Bucyrus, OH 44820
>>>>>> 419-562-6405
>>>>>> www.wavelinc.com
>>>>>>
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: wireless-boun...@wispa.org [mailto:wireless-
>>>>>> boun...@wispa.org] On
>>>>>> Behalf Of Michael Baird
>>>>>> Sent: Saturday, May 02, 2009 6:54 AM
>>>>>> To: WISPA General List
>>>>>> Subject: [WISPA] Sector separation/isolation
>>>>>>
>>>>>> We are still experimenting with aligning sector's on our towers.
>>>>>> We are
>>>>>> attempting to use 3 120 degree/13db/6.5 vb/7 degree downtilt,
>>>>>> antennas
>>>>>> to cover 360 degrees. I just inspected the towers myself, and
>>>>>> noticed
>>>>>> they are setup at 30 degrees/150 degrees/290 degrees (so they
>>>>>> aren't
>>>>>> right exactly). So the problem that caused me to inspect the
>>>>>> tower was
>>>>>> the signal level I can see the other AP's at.
>>>>>>
>>>>>> AP 30 can see AP 150 at -39 and AP 290 at -42.
>>>>>> AP 150 can see AP 30 at -42 and AP 290 at -70.
>>>>>> AP 290 can see AP 30 at -39 and AP 150 at -65.
>>>>>>
>>>>>> So I'm guessing that the reason 150/290 are much higher is
>>>>>> because of
>>>>>> the additional 20 degrees between them. These AP's are on  
>>>>>> channels
>>>>>> 1/6/11, I'm wondering if I should worry about seeing the other
>>>>>> AP's with
>>>>>> such a hot signal, and if so what are some good ways to isolate
>>>>>> them better.
>>>>>>
>>>>>> Regards
>>>>>> Michael Baird
>>>>>>
>>>>>>
>>>>>>
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