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Doing a scaling process from the performance of the telecommunications ("telecom") system of NASA's Cassini spacecraft at Saturn, I estimate the system you describe could support a data rate of a bit under 7 kbps, if the signal is received at a NASA DSN station's 34-m (diameter) antenna. If a 70-m antenna were used instead, that rate would jump to ...


1

Your question seems to answer itself in some respects: '...a power transmission of 13.1dBW (20 watts)...' But an antenna doesn't really draw power, it gets fed power (energy) from a source and radiates it into space. I think the question you really are asking is: "How much power will my amplifier need to power my 20 $W_{RF}$ communications system?" ...


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