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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It was a directly connected key and buzzer on the far end. Usually, only telegraph offices had the tools to listen to the electric signals on the wire. The message would be either kept by the receiving office if the person was in that town or sent on to the next office down the line. Eventually, it got to the intended recipient. The current was supplied by batteries at each office.
[the electric telegraph](https://www.history.com/topics/inventions/telegraph#the-electric-telegraph)
Modern radio communications can use an ics 213 form which has a recipient field. Anyone with a properly tuned radio can hear the message and copy it down. The message will then be copied down and delivered to the recipient.
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