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Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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This might be what you are looking for. http://en.wikipedia.org/wiki/Friis_transmission_equation You can solve for Pr for the receive power or Pt for the transmit power and R is the distance. This … equation has antenna gain and frequency factored in so I'm not sure if there is a more simplified version with just power and distance. Hope this helps you get started at least! …
answered May 13 '14 by josh13564