I wish they were overkill! Because of the foliage absorption even the high gain antennas mentioned did not create a reliable link until some foliage was trimmed in the 800 meter case and a RF bright spot was found for the 400 meter link. The trees are 30 to 100 foot tall fir, pine, and oaks with trunk diameters of 10 to 50 inches. Since the terrain is mountainous and sparsely populated, use of highly directional antennas with a mountain behind each one seems like it would reduce RF pollution compared to a broader beam width or omni. As an analogy, there is an omni-radiating sodium vapor yard light a half mile away. It is an irritating source of light pollution. If it was a focused beam (and wasn't shining at me) I probably wouldn't know it was there.
My wallet and I are the last ones to want overkill. If there is a better way I would love to learn it. Regards, Loren Zemenick -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Patrick Leary Sent: Tuesday, July 01, 2003 5:17 PM To: 'Loren Zemenick'; [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: RE: [BAWUG] A few little trees - wheres my saw gone Your antennas are horrendous overkill for the application. Those are the sort of antennas you use to go 15 or many more miles, NOT 400 meters. What you are doing is tossing noise out many miles beyond and it is considered very poor RF design practices. This is not a slam, it is just something to learn and the person that sold you the antenna should have known better. You should replace the antennas with a small 8dBi at most. Regards, Patrick Leary -----Original Message----- From: Loren Zemenick [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 01, 2003 8:09 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: RE: [BAWUG] A few little trees - wheres my saw gone I have two links that penetrate trees, one about 400 meters and the other about 800. The 400 meter link uses a pair of 18 dbi antennas. The 800 meter link uses a 17 dbi and a 24 dbi. All links use Linksys WAP11's. The key issues is the density of your folage. I would try it knowing if you can get a single ping returned with the omni, a directional will give you a healthy fade margin. Loren Zemenick -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Richard Fennell Sent: Tuesday, July 01, 2003 4:47 PM To: [EMAIL PROTECTED] Subject: [BAWUG] A few little trees - wheres my saw gone ok chaps, im goin to ask a question that youve probably all heard before and are fed up with answering. I currently have a high gain antenna on the top of my employers building. about 15dB hyperlink directional grid. I have just moved to a house about 400 meters away (maybe less). On the side of the house there is this great big 10 foot pole where the previous owner used it for a TV antenna (Cable rocks tbh). So i have come up with the idea of putting an omni directional at the top of this pole and seeing if i can link. Problem is the good ole LOS, i cant see my house because of trees and houses and stuff from my employers roof. Is it not even worth bothering to attempt to link the two or is there a chance that signal may either bounce or penertrate. Also i might have LOS i just havent got a ladder long enough or the the guts to go up and have a look, looks about 20-25 feet. Thanks Richy --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.495 / Virus Database: 294 - Release Date: 30/06/2003 -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless This mail passed through mail.alvarion.com **************************************************************************** ******** This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. **************************************************************************** ******** -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
