And think like the ham radio operators do in condo environments - conceal gear in everyday objects which pass condo association muster like flower pots, flag poles, bird feeders, fake bathroom roof vents etc.
Greg On May 28, 2010, at 11:03 AM, Tom DeReggi wrote: > Plenty of free advice on this list, no problem there. > > Two general rules are RF does not go through dirt (aka hill), period. > And High frequencies like 5.x Ghz does not penetrate hard surfaces like > brick and cement, and does not really penetrate anything well, so does not > penetrate wood either unless very high power. > > If you need to make a Non-Line-of-Sight shot and shoot through a structure > you are going to have to use 900Mhz. > > However, there are alternatives, such as reflection. OFDM's core benefit was > to better accept multi-path reflections to enable a combined signal without > interference. > It accomplishes this by having a larger time window to allow for all > reflected signals of the same data to arrive. > > If there are other tall building to the side of the building blocking you, > with enough gap between them, you may be able to bounce the siganl off of > one of them to reach the desired building. > > However, the first thing I'd question is why you'd try this in the first > place. Wouldn't it be better to just mount on top of the taller building? > That would be a "relay" site. > The tall building would have two radios, each with a panel antenna, one > looking down to the shorter buildings in the valley, and one looking to the > remote building that will have the gateway to the alternate Internet > provider backbone. There is no replacement for gaining a good hassle-free > Line-of-Sight connection, if there is a way to accomplish it. Radios are > inexpesnive, support afterwords may not be. Where I can understand > compromises that may need to be had along the distribution between all the > buildings, but its generally not good practice to compromise on a head end > critical link that feeds all the others. > > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Shaddi Hasan" <[email protected]> > To: "WISPA General List" <[email protected]> > Sent: Friday, May 28, 2010 10:48 AM > Subject: [WISPA] Short-range NLOS question > > >> Hello WISPA, >> >> I'm a lurker on this list that is interested in the WISP industry but >> still >> learning every day (a lot from you all!), so please forgive my ignorance. >> :) >> >> I run a small community wireless network in a low-income apartment >> complex; >> we're currently using Open-Mesh >> OM1P<http://www.streakwave.com/Itemdesc.asp?ic=OM1P&eq=&Tp=%20>'s >> with 7dBi omnis to provide coverage to a couple hundred families in about >> 25 >> buildings. For reasons that aren't relevant to this discussion and can't >> be >> changed, we may only place our mesh AP's inside resident's apartments >> (this >> is an all-volunteer operation, run on a shoestring with a small grant). We >> can place AP's outside on people's windows, but we have to be discreet. >> >> There's one section of the complex that we haven't been able to get >> coverage >> to. It's in a bit of a depression, so the tops of the buildings in the >> hollow are about even with the first floor of the ones higher up. We have >> a >> gateway for our mesh there, a CLEAR WiMax connection, that never stays up >> (we have another one on top of the hill that does stay up, but would that >> there were another WISP in our area...), so we are thinking about building >> a >> P2P link between that section of the complex and our gateways elsewhere, a >> few hundred feet away but blocked by part of this hill and several >> buildings. >> >> Because we're on such a tight budget, I wanted to solicit yall's advice >> before we made a purchase. We were thinking about using a a couple 5Ghz >> Ubiquiti NS's, but I'm not sure how well that will work given the lack of >> LOS. We were also thinking about looking for some inexpensive 900Mhz >> devices, but I'm not sure if that's overkill for what we're trying to do. >> We're not trying to get free consulting from you all, but if anyone has >> any >> pointers that might help us make a better decision or fix this problem >> they'd be greatly appreciated. >> >> Thanks! >> Shaddi >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: [email protected] >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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