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 > > > -- "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
