# Free-space path loss
# Scope: Far-field free-space path loss; no multipath or obstruction.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

distance = 100 m
frequency = 2400000000 Hz
lightSpeed = 299792458 m/s

wavelength := lightSpeed/frequency [m]
lossDb := 20*log10(4*pi*distance/wavelength)

check far field distance screen: distance/wavelength >= 10

scenario alternative: distance = 80 m