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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Typically, a unit would transmit on specific times (like the 40th minute of every hour). Also, there usually would be a method of encryption, so if you receive a transmission and can’t decrypt it using the key/legend you have, it probably isn’t meant for you.
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