Now, hold on just a minute. A specific radio broadcast with the right fequency, and decoding can be reach very far, but there is no guarantee, to be intercepted or reach anything, not to mention if we wanna make sure? We must "ring the phone" a long long time.
But if we must just blindly want to reveal ourselves, we must send out an awfully strong pulse. Like a nuclear blast with some pattern. to make oblivious it's artificial. And this is something we can also seek right?
After all, they are the stronger non intentional radiation sources. whom can possibly reach other star systems. The question is? how strong they are in radio wavelength? I did not find anything specifically related to these. But in theory? A strong EMP pulse? And don't forget nuclear power is an important step in scientific progress a Tech civilization capable to at least intercept a message or detect something like these? It's safe to say, have it!
And we don't even talked about the other byproducts of an explosion like these right? gamma beta, what the particle detectors can usually see? It is possible to detect these things from another solar system, and tell they are not natural events?
And i think we reached the core of the problem right?
Unintentional messages which send out quickly losing power.
intentional messages?
Small cone of angle, short pulses, instead long repeated "phone ringing" To make sure someone can get our messages. Even if there is someone, no guarantee the can intercept it right? Hell! Sometimes we need to ring the others for long long time, even if we know he have a phone. and the distances these messages gone? the first is aimed to 25K LY away. What's the point to send something this far? We can't get any results within historically acceptable time frame. A few decades or 100 years, ok... But anything longer than that?
Not to mention its speeds the latest's just way too fast. the bigger the compression the more chance we have for data loss. Think about it! how small the bandwidth of the space probes? And not by accident, or laziness.
Not to mention that due to the earth's rotation any given "receiver" many light years away would only be getting intermittent signal reception of radically variable strength as the transmitter is in continuous motion that is effectively emitting a spiral pattern signal.
