On Wed, Jan 07, 2004 at 09:48:19PM -0400, Brian Lloyd wrote: > Rob Genovesi wrote: > >There is a calculation for "free-space path loss" that calculates signal > >fade over distance : > > > > Loss = 96.6 + 10log(d-squared) + 10log(f-squared) dB > > > > d = distance in miles > > f = frequency in gigahertz > > > >So if you know your EIRP (transmit power + antenna gain) you can > >estimate the signal strength at "d" distance. > > This formula is incomplete because it ignores receiver sensitivity and > noise figure but I suspect it is "tuned" for a particular transceiver > where the receiver noise figure is known.
It ignores a number of other factors such as weather, refraction, diffraction, etc. It is typically used for as a rough estimate if the path is in the ballpark. Tim -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
