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A comment on Possible Radio Emission from Exoplanet Detected. Parent comment

Re:Possible Radio Emission from Exoplanet Detected by xenophonf on Friday December 18, 2020 @09:54AM (#25467624)
Not only could we send those kinds of signals, we already have done it using the Arecibo Telescope (RIP), which h̶a̶s̶ had EIRPs ranging from 200 megawatts to 22,000,000 megawatts depending on the transmission frequency. In 1974, we beamed a short message to the Messier 13 globular cluster with a transmission power of just under half a megawatt.

https://en.wikipedia.org/wiki/Arecibo_message

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Re:Possible Radio Emission from Exoplanet Detected by formerly_proven on Friday December 18, 2020 @11:01AM (#25468329)
Converting the output of a narrow-beam transmitter to EIRP for comparison with radiation sources in the universe makes the assumption that the user of the transmitter knows where to point it.
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