No one talks of the type of trees. We've noticed getting through a line of poplars, adjust antenna size, not much of a problem. But one pine tree, or a well placed ash, near impossible. Maybe the pine needles attenuate more because they are thin and in all directions thus absorbing all reflections ?? Anybody else see this.
Chuck Profito 209-988-7388 CV-ACCESS, INC [EMAIL PROTECTED] Providing High Speed Broadband to Rural Central California -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hammett Sent: Friday, June 22, 2007 9:57 AM To: WISPA General List Subject: Re: [WISPA] 5 GHz attenuation Could you provide some sort of numbers? How much loss does that 1/4 mile of water-retaining trees have? The town is basically a square with the tower on the far west side in about the center. It is 1/2 mile to the extreme corners, so there are a lot of people 1/4 mile and less. Someone on another list mentioned water retention as a show-stopper, but my limited experience had me thinking just about anything less than a 1/2 mile would work. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ----- Original Message ----- From: "Graham McIntire" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Friday, June 22, 2007 11:25 AM Subject: Re: [WISPA] 5 GHz attenuation >I have two towers running MT APs at 5.8 with CM9s and 16 dBi horiz > sectors. Using Osbridge 5GXi's as the CPE, I have clients a few miles > out with non-LOS and the occasional treeline without any issues. > > I also have one house about 3/4 mile away from my tower that's going > through nearly 1/4 mile of scattered trees. It attenuates pretty > badly during heavy rain until the leaves on the trees dry out, but > stays connected. It's my parents-in-law's house, so they're a little > more forgiving if it happens to drop than a client would be ;) > > Half a mile with scattered trees shouldn't be a problem for you, even > with snow/rain attenuation. > > Graham McIntire > Verona Networks > > > On 6/22/07, Mike Hammett <[EMAIL PROTECTED]> wrote: >> I have a 5 mile link where I'm not quite sure if the antenna is above the >> trees or not as it is on top of a mast. That link is on the better side >> of -80 for almost 2 years. Based on that I'd think I'd be okay at a half >> mile or less. I figured that with most of the town at better than -60 >> and a >> lot better than -50, I could stand to go through a few meters of tree, >> but >> that's why I came here to ask. ;-) >> >> Based on the numbers on the site I looked at, 10 db of attenuation is 27' >> of >> foliage. That'd put 20 db at 55' of foliage. >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> ----- Original Message ----- >> From: "Jack Unger" <[EMAIL PROTECTED]> >> To: "WISPA General List" <wireless@wispa.org> >> Sent: Friday, June 22, 2007 10:22 AM >> Subject: Re: [WISPA] 5 GHz attenuation >> >> >> > Mike, >> > >> > Good to go as long as the TV towers allow you to get the CPE antennas >> > above the trees. >> > >> > jack >> > >> > >> > Mike Hammett wrote: >> >> Most of my coverage area is open fields, so there isn't much to making >> >> a >> >> link work. >> >> >> >> I have an increasing demand to install an AP in a small town (no point >> >> within town is further than 1/2 mile away from the tower site). I >> >> prefer >> >> to use 5 GHz due to the amount of spectrum available. An article I >> >> read >> >> said 1.5 db per meter of foliage or 20 db per tree in 5 GHz. >> >> >> >> The grain leg is 100 - 150 feet tall. Many houses have TV towers. >> >> Radio >> >> Mobile (not counting foliage) says the worst signal I can expect to >> >> see >> >> is in the 60s with most in the 50s or 40s. >> >> >> >> Safe to assume that most of the town will be good to go? >> >> >> >> >> >> ----- >> >> Mike Hammett >> >> Intelligent Computing Solutions >> >> http://www.ics-il.com >> >> >> >> >> > >> > -- >> > Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc. >> > FCC License # PG-12-25133 >> > Serving the Broadband Wireless Industry Since 1993 >> > Author of the WISP Handbook - "Deploying License-Free Wireless WANs" >> > True Vendor-Neutral Wireless Consulting-Training-Troubleshooting >> > FCC Part 15 Certification for Manufacturers and Service Providers >> > Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com >> > >> > >> > >> > >> > -- >> > WISPA Wireless List: wireless@wispa.org >> > >> > Subscribe/Unsubscribe: >> > http://lists.wispa.org/mailman/listinfo/wireless >> > >> > Archives: http://lists.wispa.org/pipermail/wireless/ >> > >> >> -- >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > -- > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
