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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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 ?
by the use of call signs. you would be assigned one, and told the other call signs you’d need to speak to, and everytime you transmit, you’d ID yourself and call for a specific answering callsign (“ground control to major tom. Ground control to major tom….”). Standard practice is to annouce who you are when you speak, so people can keep track of who says what (“This is major tom to ground control, I’m stepping though the door…”)
to prevent impersonation, thier might be additional elements such as pre-arranged code phrases (ie the classic spy, “the winds blow strongest in june” type stuff), or just straight up encryption, where whats sent over the air is just a random set of letters (“ehtaasdfadfitgnvhesuhfjdsgkndsgohs”), and only with a decryption machine like an Engima or its allied equivalent, and the appropriate key settings, could you decipher that into a message.
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