There is the rub of course. In Atlanta, we see on average about -65 for noise in 2400, while there is no noise in 3650. SNR is important, but for the purposes of helping other WISPs understand how 3650 does through foliage I thought it better to limit the discussion to signal as noise varies by market.
We have done longer links NLOS with 3650, but I would say .5 miles is the average we can get away with. -Matt On Dec 2, 2008, at 12:18 PM, John Scrivner wrote: > Matt, > Would you not agree that you probably have at least 9 db better noise > figures than 2.4 at the same distance where you are seeing 9 db less > signal? > That is what I was trying to illustrate in my post. Even though the > signal > drops a little more in the 3650 coverage area than 2.4 we see roughly > equivalent coverage areas due to lower noise floor and hence better > SNR at > the edge of the coverage area. > > Matt, I seem to remember a post from you recently where you were > touting a > link through 4 miles of tress with 3650. Was I not reading that > correctly? > Scriv > > > On Tue, Dec 2, 2008 at 11:03 AM, Matt Liotta <[EMAIL PROTECTED]> wrote: > >> We see on average 9dB less signal with 3650 than 2400 NLOS with all >> things being equal. >> >> -Matt >> >> On Dec 2, 2008, at 11:42 AM, John Scrivner wrote: >> >>> Our coverage looks like 2.4 GHz coverage in the same environment >>> with the >>> exception of much lower noise floor which helps extend link budgets >>> slightly >>> and help increase reliability at the edge of the coverage area. >>> Scriv >>> >>> >>> On Tue, Dec 2, 2008 at 10:28 AM, Mike Hammett <[EMAIL PROTECTED] >>>> wrote: >>> >>>> So according to the document from Hawaii, 3.6 GHz should have lower >>>> atmospheric attenuation (I'm assuming this is similar or the same >>>> to free >>>> space loss) than 2.4 GHz. I'm not at sea level, but I am by no >>>> means at >>>> 9150 meters! >>>> >>>> Because water is the molecule at play here, that would also show a >>>> difference in foliage penetration. Not trying to go through a >>>> forest or >>>> anything, but wondering how it would handle a tree or two. >>>> >>>> >>>> ----- >>>> Mike Hammett >>>> Intelligent Computing Solutions >>>> http://www.ics-il.com >>>> >>>> >>>> >>>> -------------------------------------------------- >>>> From: "Patrick Shoemaker" <[EMAIL PROTECTED]> >>>> Sent: Tuesday, December 02, 2008 10:10 AM >>>> To: "WISPA General List" <wireless@wispa.org> >>>> Subject: Re: [WISPA] 3650 Foliage >>>> >>>>> >>>> >> http://www.phys.hawaii.edu/~anita/web/paperwork/currently%20organizing/Military%20EW%20%20Handbook%20Excerpt/rf_absor.pdf >> >> <http://www.phys.hawaii.edu/%7Eanita/web/paperwork/currently%20organizing/Military%20EW%20%20Handbook%20Excerpt/rf_absor.pdf >> >> > >>>> < >> http://www.phys.hawaii.edu/%7Eanita/web/paperwork/currently%20organizing/Military%20EW%20%20Handbook%20Excerpt/rf_absor.pdf >>>>> >>>>> >>>>> http://www.rfcafe.com/references/electrical/atm-absorption.htm >>>>> >>>>> >>>>> Patrick Shoemaker >>>>> Vector Data Systems LLC >>>>> [EMAIL PROTECTED] >>>>> office: (301) 358-1690 x36 >>>>> http://www.vectordatasystems.com >>>>> >>>>> >>>>> Mike Hammett wrote: >>>>>> Well right. >>>>>> >>>>>> I could only assume that 3650 is better than 5.x GHz, but >>>>>> sometimes you >>>>>> match something's... I think natural frequency is the term I'm >>>>>> looking >>>>>> for. >>>>>> Like how 70 - 80 GHz gear goes farther than 60 GHz, because 60 >>>>>> GHz is >>>> the >>>>>> natural frequency of oxygen. >>>>>> >>>>>> >>>>>> ----- >>>>>> Mike Hammett >>>>>> Intelligent Computing Solutions >>>>>> http://www.ics-il.com >>>>>> >>>>>> >>>>>> >>>>>> -------------------------------------------------- >>>>>> From: "Charles Wu (CTI)" <[EMAIL PROTECTED]> >>>>>> Sent: Tuesday, December 02, 2008 9:53 AM >>>>>> To: "WISPA General List" <wireless@wispa.org> >>>>>> Subject: Re: [WISPA] 3650 Foliage >>>>>> >>>>>>>> Have we gotten any reports how 3650 works with foliage? >>>>>>> It doesn't >>>>>>> >>>>>>>> Would MIMO have any affect on foliage penetration ability? >>>>>>> Sure, it might help, but 700 would help more >>>>>>> >>>>>>> -Charles >>>>>>> >>>>>>> This message is intended only for the use of the individual or >>>>>>> entity >>>> to >>>>>>> which it is addressed and may contain information that is >>>>>>> privileged, >>>>>>> confidential and exempt from disclosure under applicable law. If >>>>>>> the >>>>>>> reader of this message is not the intended recipient, or the >>>>>>> employee >>>> or >>>>>>> agent responsible for delivery of the message to the intended >>>> recipient, >>>>>>> you are hereby notified that any dissemination, distribution or >>>>>>> copying >>>>>>> of >>>>>>> this communication is strictly prohibited. If you have received >>>>>>> this >>>>>>> communication in error, please notify us immediately by >>>>>>> telephone at >>>>>>> 630-344-1586. >>>>>>> >>>>>>> >>>>>>> >>>> >> -------------------------------------------------------------------------------- >>>>>>> WISPA Wants You! 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