"D. Stussy" wrote:
Arthur Harris wrote:

Path Loss (in dB) = 36.6 + 20 Log F + 20 Log D

Where F is frequency in MHz and D is Distance in miles. This equation
assumes isotropic antennas at each end.

Are you certain that the distance should be measured in miles and not
kilometers?

Yes, it's miles. If using kilometers, use 32.45 instead of 36.6 in the equation.

There are several path loss calculators on the web, such as:

http://www.decibelproducts.com/Calcu...qfreespace.htm

Art Harris N2AH