[GreenKeys] Sheldon and Greg,

[Don Mehl]

    In WW II we could send a "break" signal which enabled the receiving station to stop the transmiting station.  That was to stop a message that accidentally was being sent in the clear.  If you received garble you could also stop transmission and ask for a repeat. Some messages were very long and HF paths over long distances not always reliable. It made for long nights in the windowless frooms.
    - I am out of hard cover SIGTOT books but can furnish a soft cover for $20.  I have a hard cover "TOP SECRET COMMUNICATIONS OF WORLD WAR II" that is available for $55, all including  shipping.  It covers SIGTOT and SIGSALY the voice scrambling system and some others.
Don W5BB


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