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- … that a National Traffic System radiogram uses "X" in place of a period and "QUERY" for a question mark?
- … that at the top end of antenna rotators, some large stations use surplus aircraft propeller-pitch motors?
- … that Hellschreiber, whose name means "Hell's writer", was invented by Rudolf Hell and used by the German army in World War II?
- … that the 6-meter band earned the nickname "the magic band" because, with little warning, it can open to stations a thousand miles away?
- … that to keep out spam, Winlink won't deliver mail from an internet address unless the user has written to it or added it to an accept list?
- … that Collins Radio founder Arthur Collins, licensed at 14, relayed a 1925 Navy Greenland expedition's messages when the Navy's own station could not reliably hear it?
