

EME

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
surface reflectivity.
 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.
© Copyright:
Owen Duffy 1995, 2019. All rights reserved. Disclaimer.