Fresnel Zone Calculation
Given the location of the transmitter and receiver, we calculate the first fresnel zone boundaries between the two. Having the fresnel zone overlayed on the terrain map we can see the possible multipath obstructions. However we do not take into account any buildings, forest etc...
As usual all results: AS IS, no responsibility assumed.
The Terrain Profile
Notes:
Given the TX/RX latitude and longitude, the Great Circle distance will be calculated and the terrain profile between the points. The earth curvature, with refraction calculation will be used to define the effective profile between the link ends
A single point obstruction can be defined at a distance from the TX and with the specified height.
The 1st fresnel zone is drawn with the zone variance (% of wavelength). Normally 60%.
The refraction number defines (by default 1.33) how much the RF is refracted by the atmosphere, however refraction is highly variable with frequency, season, terrain type, hence the extreme range reliability is also very changeable. Use 1.0 for true 100% reception reliability.