Comments by "Sar Jim" (@sarjim4381) on "How Germany lost the radar race in WW2" video.

  1. The Germans developed a high speed single and double sideband submarine radio system called Kurier in August, 1944. It replaced the conventional code signals with high speed bursts of 10 words in less than a second, then switched to another frequency and sideband for another burst, and so on until the message was complete. We have examples of the transmitters but no receivers have survived It is presumed that the last character of each transmission was a data burst telling the receiver what frequency and sideband to switch to for the next message part. All German reports were this was a highly effective system, and none of the Allies ever reported being able to successfully D/F a Kurier signal. The RN and USN weren't even aware of the system until war's end. If the Germans had developed this system two years earlier it would have crippled British efforts to locate German submarines by D/F.
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