Hello Group,
I came across an equation for radiated signal path-loss (attenuation). I’d like to check my understanding of its meaning. The equation is Attenuation = 37 + 20 log (F MHz) + 20 log (D miles). So for instance, If I wanted to know the distance for a radiated signal (2450 MHz) to be attenuated by 100db, the calculation would be [100 – 37 – 20 log (2450)] / 20 = log (D miles) and the answer in miles would be 0.5765 miles… or 3044 feet. My assumption is that this equation gives an answer for line-of-sight (1/R^2) type of loss. I’d like to estimate loss for a cluttered environment that approximates 1/R^3 or 1/R^4. My question is, how could this equation be modified for that purpose, or is there some other standard equation to estimate loss at a given frequency in varying environments, either in meters or feet etc. I have tried a few ideas, but numeracy fails me on this occasion. Thanks in Advance. George Stults WatchGuard Technologies Inc.
