Travis,

I will try that too, but do you think that would cause poor RSL at the 
AP? I would think the downtilt would cause more issues with the CPE's RSL.

Regards
Michael Baird
> Hi,
>
> I have to agree with Gino here... even at 7 degree downtilt, you are 
> cutting it very close. You may want to try 5 degrees on just one 
> sector and see if that helps.
>
> Travis
>
>
> Michael Baird wrote:
>> Gino, wisp-router.com, would the downtilt affect the AP RSSI level?
>>
>> Antenna Height       
>>      ft       
>> Downtilt Angle       
>>      °        
>> Vertical Beamwidth   
>>      °       
>> Results
>> Inner -3dB Radius    0.1     Miles
>> Sweet spot   0.2     Miles
>> Outer -3dB Radius    5.24    Miles
>>
>>
>> I told him 7.8, but I'm sure he didn't get dead on, just the best he 
>> could with his inclinometer.
>>
>> Regards
>> Michael Baird
>>   
>>> Where are you running the calcs? I use
>>> http://www.wirelessconnections.net/calcs/AntDowntiltCalc.as 
>>>
>>> With your input, I get main lobe 0.2 miles / -3db @ 7
>>>
>>> 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 1:51 PM
>>> To: WISPA General List
>>> Subject: Re: [WISPA] Radio Seperation
>>>
>>> Gino,
>>>
>>> 145', 15 degree VB, 7.7/7.8 puts my -3d at ~5 miles. If my downtilt was
>>> wrong, I would think it would impact the receive on my CPE's, much more
>>> then on the tower AP's, maybe that's a poor assumption on my part
>>> though.
>>>
>>> Regards
>>> Michael Baird
>>>   
>>>     
>>>> 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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