Recommendation ITU-R P.528 contains a method for calculating path loss in the frequency range from 125 to 15500 MHz for ground-air, ground-satellite, air-air, air-satellite, and satellite-satellite links. It provides an interpolation method from a set of curves.
This version corresponds to the superseded Recommendation ITU-R P.528-3 (02/2012), and it is based on interpolation from the tabular data. It superseded by the new step-by-step method available in Recommendation ITU-R P.528-5.