[Milsurplus] VLF/ELF submarine comms

[Ralph Cameron]

What about TACAMO?  Didn't they use extremely long wave propagation to contact submerged subs? Didn't they use a very narrow FSK mode of transmission? If so, did what did they decode it with? 

I realize the message were very short due to the slow data rate but it was a form of RTTY. 

I understand the Russians used a very low shift FSK mode at fairly high speed which was not too apparaent to the ear. encrypted, it was difficult to decipher. 

Ralph
VE3BBM
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