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
