[Arran]

I found out what it actually was, with very little research. Apparently the idea was that they would have the transmitter, and receiver, switch frequencies using a punched out paper roll like a player piano. Nothing was ever built, not even a prototype, just some drawings, and a pair of patents for the device. From what I read frequency hopping only works well at higher frequencies, but higher frequencies do not transmit well under salt water, I don't know if this is true but for whatever reason the U.S Navy rejected the idea believing that it was impractical.
Regards
Arran