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How weak is the radio signal transmitted from Galileo when it reaches the DSN antennas on Earth?

April 26, 2017ANTENNAS DSN earth Galileo radio reaches signal weak

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How weak is the radio signal transmitted from Galileo when it reaches the DSN antennas on Earth?

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Galileo outputs around 20 watts of power, slightly less than the power of a refrigerator lightbulb. By the time it reaches the DSN antennas on Earth, a 70 Meter antenna is able to scoop up only about one part in 10 to the 20th watt, in other words .00000000000000000001 watt. But it’s enough to do great science.