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INTRODUCTION
In designing systems for space communication it is essential to know the transmitter power that will be required and the antenna sizes, both in space and on the ground, that will allow adequate effective communication with acceptable signal to noise ratio or bit error rate.
Fortunately, communication in space is usually line of sight with no intervening absorption and little scattering media involved. It is therefore easy to calculate and predict the actual communication parameters quite accurately.
You may find the full explanation at
https://www.spaceacademy.net.au/spacelink/spcomcalc.htm