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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Sometimes, the sender and receiver have agreed in advance on a time and radio channel to be on. The sender will transmit, and the receiver will listen at that time and channel. Other times, someone who is transmitting is expecting multiple people to receive it. This is especially the case in emergencies: you want as many people to hear it as possible.
But most importantly, in most cases anyone sending and receiving via radio has call signs or other ways of identifying themselves. Someone may say “XYZZY, this is WXYZ, are you there?” and everyone knows who the message is for and from, even if they don’t know exactly who XYZZY and WXYZ are.
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