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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In a standard electrical telegraph system, the machines used by the sender and receiver were directly linked by a wire that could carry electrical current. This meant that the system was very much not portable/flexible. In early days, these wires led into fixed telegraph offices, with the “last mile” of getting the message to/from the people actually communicating was still done with paper and couriers. Depending on the number of wires connecting two places, it also had terrible bandwidth (i.e. no ability to send/receive more than a message or two at once), which is why telegraphs were so short and expensive.
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