B Feasibility of Sending a Radio Signal Detectable from a Neighboring Star

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Sending a detectable radio signal to a neighboring star system like Alpha Centauri poses significant challenges regarding transmitter size and energy requirements. A large transmitting antenna or array would be necessary to ensure the signal stands out from background noise, while substantial transmission power would be needed for detection by modern radio telescopes. Current and near-future technology must be evaluated for its ability to generate and sustain such power. The discussion also raises questions about the likelihood of receiving signals from intelligent life, emphasizing the importance of directional broadcasting and the size of receiving equipment. Overall, the feasibility of interstellar radio communication remains a complex issue influenced by technological and practical limitations.
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TL;DR Summary
Can we send a signal to nearby stars?
I have been wondering what it would take to send a radio signal that could be detected from a neighboring star system (for example, Alpha Centauri, ~4.3 light-years away).
  1. Transmitter size: How large would a transmitting antenna or array need to be for such a signal to be detectable above background noise?
  2. Energy requirements: How much transmission power would be required for detection using a large, modern radio telescope at the receiving end?
  3. Feasibility: Could this power realistically be generated and sustained with current or near-future technology?

I am only thinking about conventional radio communication and would like to know if there are existing calculations or real-world examples (such as planetary radar or deep-space communication) that provide a useful comparison.

The reason for the question is actually the other way around; Can we reasonably expect to receive radio signals from intelligent life on other stars (if it exists at all)?
 
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Is the broadcast and/or reception directional and targeted to/from the Earth?
 
Also, how large is the receiver?
 
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What research have you done on this question? What have you found out so far? With 75 posts, you should know by now that this is not a Q&A forum. You need to show some work on your own.
 
Trysse said:
The reason for the question is actually the other way around; Can we reasonably expect to receive radio signals from intelligent life on other stars (if it exists at all)?
Have you read the similar thread.
 
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More than anything else, it depends on whether they are listening. We've been sending signals of some sort for almost a century. Have you heard about SETI? Go look up what they have to say about this.
 
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