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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