John, Interesting data. However, any data on how those links performed on rainy days?
The deal with Foliage is that wet foliage causes a lot more loss than dry foliage or wet air. I can give an example of 5.8Ghz that might have 1db of loss in a rain storm, but in a heavy rain 900Mhz might have had 15 db more of loss through foliage than when its dry. (obviously I do not have an apples to apples comparision since we use 900 where we have foliage and 5.8 where we do not.) So Sure 3650 does OK when its dry, but in rain? Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "John Rock" <[EMAIL PROTECTED]> To: "'WISPA General List'" <wireless@wispa.org> Sent: Tuesday, December 02, 2008 12:21 PM Subject: Re: [WISPA] 3650 Foliage We have many 3.65GHz WiMAX Base Stations deployed and propagation has been real positive even through some foliage. Picture1 - http://www.wirelessconnections.net/index.php?option=com_shared_private_space &task=showfile&fileid=117 Picture2 - http://www.wirelessconnections.net/index.php?option=com_shared_private_space &task=showfile&fileid=118 Picture3 - http://www.wirelessconnections.net/index.php?option=com_shared_private_space &task=showfile&fileid=119 The above pictures are from a shot we had in Texas to a 3.65 Base Station, I have more tree pictures. The customer had an older original Alvarion VL CPE at 5.8GHz. They installed the VL on a 40 ft guyed mast pole, to get good SNR. At 3.65 GHz from street level(12ft AGL) beside the house we had -75 dBm and downlink/uplink at 64QAM/16QAM respectively we pulled 6Mb/3Mb and perfect Voice calls from the truck. The WISP is thrilled with their coverage in the small town even through foliage. As you can see we shot between two pine trees and "through" the other trees. At this site we were almost 1.1 Miles away. I would classify the foliage as "light". The key to everything is defining the word foliage. How dense is the foliage? How tall? How much power at the Base Station and CPE? Diversity? How far away are you from the Base Station? MIMO or second/fourth order diversity at 3.65Ghz is not being done at the CPE level yet and only on select type of Base Stations. At the Base Stations with Second or Fourth order diversity we see greatly improved uplink capabilities and a lot better connectivity in NLOS environments because of the improved Uplinks. Passing reliable data at -85 to -92dBm is obtainable, although I highly recommend only installing clients with "good" signal strength. Most systems require -74 to -78dBm or better to achieve reliable full burst rates(64QAM3/4)...When CPE become available with MIMO we can expect even better sensitivity in the Downlink also. It becomes a question on how long it takes the vendors to implement 802.16e flavored in 3.65GHz., Mid/Late 2009 is my bet. We can build an RF system at any frequency that can get through foliage, it comes down to how much do you want to spend to get that type of coverage within your areas terrain. Thinking 3.65GHz can cover through foliage at long range is a myth. And I understand that most operators want to cover 50 miles NLOS from a single tower site at 75' AGL... 700 MHZ can work better if you own that spectrum for use? 3.65GHz is open to about anyone. Thanks, John Rock Director of Operations - Senior Engineer Wireless Connections 166 Milan Ave., Norwalk, Oh. 44857 ACCessing the Future Today!! ofc. 419.660.6100 cell 419-706-7356 fax 419-668-4077 http://www.wirelessconnections.net This transmission and any files attached to it, may contain confidential and/or privileged information and intended only for the named recipient. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, retransmission, dissemination, disclosure, copying or any use of the information or files contained is strictly prohibited. If you have received this transmission in error, please notify the sender by reply transmission and delete this electronic mail. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hammett Sent: Tuesday, December 02, 2008 10:09 AM To: WISPA General List Subject: [WISPA] 3650 Foliage Have we gotten any reports how 3650 works with foliage? Would MIMO have any affect on foliage penetration ability? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ---------------------------------------------------------------------------- ---- WISPA Wants You! 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