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Wireless network
Internet connections in my area are either t1 or wireless and are very
expensive. Our place is on the edge of town, covers acres (A little less than five) and has three buildings (Metal roofs cinder block external walls). Can someone recommend complete (Cables seem to get cut here a lot.) solution that stays legal (Boise Idaho) and will cover our needs? While I am not stupid this is not my field of expertise so a list of equipment would be appreciated. That is if this is even possible. I am looking for something that will cover to the buildings. Once at the building's I can then take the signal back to a wired network. You can see the place I am talking about to get a better picture. (next to an airport.) http://terraserver.microsoft.com/addressimage.aspx?t=1&s=10&Lon=-116.25518820&Lat=43.57528526&Alon=-116.25518820&Alat=43.57528526&w=1&opt=0&ref=A|5920 %20W%20Victory%20Rd,%20Boise,%20ID%2083709 I have looked at http://www.technolab-inc.com/cgi-loc.../ppalstore.cgi to cover the area. From what I have read I understand I can not output more than 1 WATT at the antenna. If I go with an netgear WGT624 amp and antenna I think I can put out around 38 DBi |
#2
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In article ,
Lonnie wrote: Internet connections in my area are either t1 or wireless and are very expensive. Our place is on the edge of town, covers acres (A little less than five) and has three buildings (Metal roofs cinder block external walls). Can someone recommend complete (Cables seem to get cut here a lot.) solution that stays legal (Boise Idaho) and will cover our needs? While I am not stupid this is not my field of expertise so a list of equipment would be appreciated. That is if this is even possible. I am looking for something that will cover to the buildings. Once at the building's I can then take the signal back to a wired network. You can see the place I am talking about to get a better picture. (next to an airport.) http://terraserver.microsoft.com/addressimage.aspx?t=1&s=10&Lon=-116.25518820&Lat=43.57528526&Alon=-116.25518820&Alat=43.57528526&w=1&opt=0&ref=A|5920 %20W%20Victory%20Rd,%20Boise,%20ID%2083709 I have looked at http://www.technolab-inc.com/cgi-loc.../ppalstore.cgi to cover the area. From what I have read I understand I can not output more than 1 WATT at the antenna. I believe that the standard is 1 watt PEP into an omnidirectional antenna having 6 dBi of gain... hence, an EIRP of 36 dBm. If your setup is for point-to-multipoint access (e.g a single access point and a bunch of roving stations) you're limited to this 36 dBm EIRP, and if you use a higher-power transmitter you must reduce your antenna gain accordingly. You can achieve higher EIRP for those links which are "exclusively for fixed, point-to-point operations", by using higher-gain directional antennas. For every 3 dB of antenna gain above the 6 dBi, you must decrease your transmitter power by 1 dB. This combination can enable you to get EIRP of up to about 50 dBm, by using (e.g.) 23 dBm of transmitter power and a 27 dBi gain antenna. If I go with an netgear WGT624 amp and antenna I think I can put out around 38 DBi My guess is that you're going to have serious trouble if you try to cover that much area with a single high-powered access point. You probably could not boost the access point's power or gain high to cover the outbuildings, without exceeding the 36 dBm EIRP limit. And, even if you could, the little 15 dBm transmitters in most 802.11b cards probably couldn't get a strong enough signal back to the access point. What you probably could do, though, is to install an access point at your central building which is intended to create point-to-point links with the outbuildings. You'd install one or more directional gain antennas at the central building (e.g. Yagis or parabolic dishes, aimed at the outbuildings), and install similar gain antennas on the outbuildings. You'd install an 802.11b bridge (or something acting as one) in each outbuilding... the outbuildings could use wired Ethernet inside, or could each have an 802.11b access point running on a different channel. I've spoken with a guy who has wide-area 802.11b networks of this sort running here in the San Francisco Bay area. By using parabolic dish antennas on both ends of the links, he can maintain full-speed 802.11b links over distances of several miles, using only ordinary 802.11b access points and PCMCIA cards (typically 15-16 dBm output) - no amps are necessary. This is the best way, I think, to do the job - it doesn't require the use of excessive power. Now, it's possible that you could perhaps use 802.11b at higher power levels under the terms of Part 97 (amateur radio) if you and the other users are licensed. However, doing so legally looks tricky to me... you have to avoid _any_ commercial use of the link, and cannot use encryption (no WEP, no SSL). www.maxrad.com is one source for highly-directional 2.4 GHz antennas. There are plenty of others. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
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Thank you both Dave and Alex.
RE Dave's post. I think you are right. 1 watt at the base of the antenna is what you are allowed. So you think that the total dbm I can run is 36 for omni? Is there a height limit to that? Re Omni verses directional. I would not mind doing directional. I just did not know how to add different directions. Can you do several antenna easily? In either case, omni or direct I always planned on running the signal through wire (well both wire and wireless off another router.) once I got to the building. My big problem is I can not find a site that will tell me in plain language what parts I need to get this stuff to an antenna. I can do all the network stuff but this signal stuff is just kicking my butt. I know want to setup the most complicated/powerfull omni I can at a reasonable price just so I understand the distances it will travel. Re Alex's post While not a amateur radio person at heart I am a experimenter. I have looked at serveral sites that show how to turn a pringle can http://www.turnpoint.net/wireless/has.html into an antenna to an old primestar dish http://www.wwc.edu/~frohro/Airport/P...Primestar.html .. Once I know more info I fully intend to play with all this and more. I am just having problems finding all the parts. Well best parts best info. All that stuff. I figure poeple like you and Dave may know where to find sites that will put all this info in laymans terms. Once again. Thank you all. |
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