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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First, I assume you are talking about using telegraphs? If so, they were literally connected via lines (wires, like for landline telephones). One person sent a message over the line and anyone on that line could hear it. They would then transcribe it and deliver the message to the intended person. It’s like “snail” mail, but via electrical lines.
When they were concerned about people intercepting them, they would send them via a code.
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