Somebody didn't have their morning coffee I see... -- Jeff King, [EMAIL PROTECTED] on 01/07/2004
On Wed, 7 Jan 2004 03:56:11 -0800, Jim Thompson wrote: > >in theory, the path-loss coefficient in LOS is 2.0. > >In practice, its never that low (except under constrained examples). > I gave a general equation (that is simple to use) yesterday. You >followed up with something that doesn't even apply except in the >most unique of circumstance. > >jim > >[EMAIL PROTECTED] writes: >>Jim >> >>As I said this is a rule of thumb and mainly for outdoor LOS >>setups. This is what most wisp uses, as do we, for a general idea >>for judging distances and in the field it works well. >> >>Sincerely, Tony Morella Demarc Technology Group, A Wireless >>Solution Provider Office: 908-996-7995 Fax: 908-847-0202 >>http://www.demarctech.com >> >> >>-----Original Message----- From: [EMAIL PROTECTED] >>[mailto:[EMAIL PROTECTED] On Behalf Of Jim Thompson >>Sent: Wednesday, January 07, 2004 5:47 AM To: >>[EMAIL PROTECTED] Cc: 'Ivan Bojer'; 'BayArea Wireless >>UserGroup' Subject: RE: [BAWUG] Antenna db gain and range >> >> >>This is only (ever) true if your path-loss coefficient is '2.0', >>which it almost never is. In fact, in "metro-urban" environments, >>it can be 4.0, or higher, and indoor office environments typically >>range between 3.0 adn 3.5 (but can go higher). >> >>If your path-loss coefficient is 4.0, then your 6dBm of additional >>ERIP will only get you 1.5dB more in range, or about 1.4X the range >>of the solution that is down 6dBm in EIRP. >> >>Jim >> >>[EMAIL PROTECTED] writes: >>>A simple rule of thumb is every 3dBm doubles your power and every >>>6dBm doubles your distance. >>> >>>Sincerely, Tony Morella Demarc Technology Group, A Wireless >>>Solution Provider Office: 908-996-7995 Fax: 908-847-0202 >>>http://www.demarctech.com >>> >>> >>>-----Original Message----- From: [EMAIL PROTECTED] >>>[mailto:[EMAIL PROTECTED] On Behalf Of Ivan Bojer >>>Sent: Monday, January 05, 2004 3:37 PM To: BayArea Wireless >>>UserGroup Subject: [BAWUG] Antenna db gain and range >>> >>>I know this question is very vague, but still I wonder if there is >>>an answer to it. >>> >>>Is there a theoretical formula that links antenna dB gain with >>>increase in maximum range of the wireless signal. I understand >>>that in theory RF signal range is infinity, but I can not figure >>>out if there is a correlation between antenna dB gain and signal >>>range at >>certain frequency. Following the common logic it is obvious that >>range will increase as antenna has better dB gain, but how much? >>> >>>A formula for electric field goes something like: E=9500 >>>*power/distance (I might be wrong about this), but this does not >>>take in account the frequency of our signal. >>> >>>P.S. I am not concerned with terrain configuration, weather >>>condition, and other factors at this time. >>> >>>-- general wireless list, a bawug thing <http://www.bawug.org/> >>>[un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless >>> >>>--- Incoming mail is certified Virus Free. Checked by AVG anti- >>>virus system (http://www.grisoft.com). Version: 6.0.558 / Virus >>>Database: 350 - Release Date: 1/2/2004 >>> >>> >>>-- general wireless list, a bawug thing <http://www.bawug.org/> >>>[un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless >>> >> >>-- "Speed, it seems to me, provides the one genuinely modern >>pleasure." -- Aldous Huxley (1894 - 1963) >> >>-- general wireless list, a bawug thing <http://www.bawug.org/> >>[un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless >> >>--- Incoming mail is certified Virus Free. Checked by AVG anti- >>virus system (http://www.grisoft.com). Version: 6.0.558 / Virus >>Database: 350 - Release Date: 1/2/2004 >> >> >> -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
