Dunno, take say 1 gram of matter and convert it to energy. Then assume something 100x better than the JWST, add in a few more decades of signal processing, enc

Dunno, take say 1 gram of matter and convert it to energy. Then assume something 100x better than the JWST, add in a few more decades of signal processing, encoding, etc. Add in the possibility of receiving from more than a single solar system. After all some random ham in 2005 set a record of 13M miles per watt. That's in 2005, with an standard radio (elecraft k1) and not any exotic receivers like say something 100-1000x better than the JWST that's I'd expect earth to have over the next few decades, let alone some other civilization that's sending sensors to likely millions of solar systems if they found us. That's only 400kw for a light year, not that much assuming you are slinging sensors into other solar systems.