Reply to post: Morse Code and ELF

What happens when a Royal Navy warship sees a NATO task force headed straight for it? A crash course in Morse


Morse Code and ELF

The discussion of Morse code reminded me of my first real tech job after I got my BSEE and while I was working on my MS in Computer Science. I was working on a project to understand the propagation of Extreme Low Frequency (ELF) radio waves which were in the range of 15-30 KHz. Since ELF signals propagated around the world and penetrated water a few feet, they were used to communicate with slightly submerged submarines trailing a mile-long antenna. Due the low carrier frequency the signal bandwidth was very small and was used for low-speed Morse communications. Several of my colleagues on the project knew Morse and could transcribe it, but since it was all encoded strings of numbers, I never bothered to learn it.

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