Using FSC to calculate EME paths
An EME path depends not only on the round trip distance, but
reflection from the Moon depends on its distance (at the time) and
- The round trip distance can be accounted for by adding 6dB Extra
Path Loss to the one way distance.
- The area subtended by the fully illuminated moon is proportional
to the distance squared. This can be accounted for by raising the
distance exponent in FSC to 4 and adding 10log(16/3400000^2) or
−118.59dB Extra Path Loss.
- Surface reflectivity is about 6.5% and can be accounted for by
adding 11.87dB Extra Path Loss.
So, enter the actual one way path distance, a distance exponent of 4
and an Extra Path Loss of −100.7dB.
The above example shows the moon at perigee, 407,000km.
Owen Duffy 1995, 2021. All rights reserved. Disclaimer.