I see it used a lot in old movies, people communicating over great distances with dots and dashes
If the signal is bounced off the ionosphere how does the person receiving the message know which message is theirs?
I’m assuming many messages were sent during the war … with all those messages bouncing around how did we zero on the one specifically for the receiver ?
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Much like telecommunications today, many were routed through wired connections. Just they had to use switchboards to connect endpoints. Radio communications were (and still are) tuned to specific frequencies. In this case, it wasn’t directed at a specific receiver, as anyone else tuned into that frequency could hear it too. If the communication was sensitive, it could be encrypted with a cipher shared by both sender and receiver. The enigma machine was used for this by WW2 Germany and famously broken by the Allies who could listen in to otherwise secure German communications.
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