It will link in 1X mode at 3dB S/N and 2X at 10dB S/N. you need to maintain those levels so you need to add enough gain to deal with trees in the spring which tend to have the highest loss of the year.
with that said, 900 MHz is a bad bet IMO. If you plan to roll out 900, you need to look at it one of two ways: 1. the noise is as bad as it's going to get (i.e. smart meters or other FHSS 900MHz system are rolled out) and you engineer around it. 2. you plan for a future noise floor of -60dB and engineer around that. - Jerry From: [email protected] [mailto:[email protected]] On Behalf Of chris cooper Sent: Thursday, September 16, 2010 12:43 PM To: 'WISPA General List' Subject: Re: [WISPA] Trees under half mile Ive never deployed Canopy 900. Vendor materials say it will work at a 3 db C/I. Can you keep a solid connection w/ decent throughput at that ratio? Chris -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jason Hensley Sent: Thursday, September 16, 2010 3:05 PM To: [email protected]; 'WISPA General List' Subject: Re: [WISPA] Trees under half mile At my house, I live in a hole with about ¾ mile of solid oak trees between me and the tower. 2.4Ghz in the late spring (meaning good, saturated leaves) I can run 4meg. When it rains, service will be spotty and sometimes drop. I would never install a customer in those conditions. We do have a few customers through trees, but with our noise floor here, we don't do much more than just a few trees at a pretty close proximity to our AP's. I wouldn't even think about 5Ghz through trees at all. 3650 - haven't done anything through trees yet so I don't know. 900Mhz worked great for us for awhile but noise floor went too high and couldn't work around it so we pulled all our 900 equipment. From: [email protected] [mailto:[email protected]] On Behalf Of Nick White Sent: Thursday, September 16, 2010 10:50 AM To: [email protected] Subject: Re: [WISPA] Trees under half mile So what kinds of distances are people currently going through trees, and what kinds of signals, CCQ, throughput, etc. are you seeing? I guess I'm looking for success stories. I need to sell this to the partners. I know it can be done, and I'm fairly confident it will work in this situation, but they aren't. I've found a few instances online of people going 1 mile with 5.8 through some trees and still pulling off a -65 and 20Mbps of throughput - this was PTP. I know 3.65Ghz is supposed to be somewhere between 2.4 and 5.8 in terms of tree penetration, but I'm thinking this might be a good place to use 3.65, simply because of the lack of noise. I have never worked with 900Mhz as of yet. This was our initial alternative, but there is the added cost of deployment - $160 for a LocoM900 vs $80 for a NanobridgeM2. Literally doubles our ROI. On 9/13/2010 3:58 PM, Glenn Kelley wrote: 3.65 is limited in that you can only go as high as 99 feet I believe - someone will correct me if I am wrong. If you are using airmax - 2.4 should help 5ghz you may have some issues w/ trees however My suggestion is a mix - I noticed that you have not mentioned 900mhz 900 and trees especially at that distance - sub 1 mile is awesome - but doubt you will see the 10mbps speeds you wish. 5ghz is your best choice - if you can use it. setting up both 2.4 and 5ghz sectors may help - double the cost - but in the end - would allow you the most flexibility On Sep 13, 2010, at 6:20 PM, Nick White wrote: om this tower, no one in town would be more than .75 miles away. I'm thinking 10Mhz channels - 1, 6, 11. If we do this, I will likely use the UBNT shields that I've seen for sale with three 120deg sectors. _____________________________________________________________________________________ Glenn Kelley | Principle | HostMedic |www.HostMedic.com<http://www.HostMedic.com> Email: [email protected]<mailto:[email protected]> Pplease don't print this e-mail unless you really need to. -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected]<mailto:[email protected]> Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3137 - Release Date: 09/15/10 14:34:00
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