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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The transmitter would send at a specific frequence and the reviecer would be set up to recieve at that same frequency. This is similar to how an old radio can recieve multiple different radio stations, but only one at a time.
If multiple people use the same frequency at the same time, they would need procedures for not talking over eachother. Walky talkies have this same problem, that is why they say over when it is time for the next person to seak.
Other than using the same frequency, radio signals are boradcast to everyone. This is the reason codes were used, as the enemy would need to break the code th actually know what was being sent.
A more amusing example is jamming: sending noise so that the opponents cannot hear eachother. In ww1 both the british and germans were jamming using their own anthem, in an attempt to demoralise the other. That is until they realised that their anthems were both set to the same tune.
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