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 >>>>>> >>>>>> >>>>>> -------------------------------------------------------------------- >>>>>> - >>>>>> ----------- >>>>>> WISPA Wants You! 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