Template:Did you know/9
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- … that Morse code is about 15 dB more effective than voice for the same power?
- … that the first known printed use of "Elmer" for a ham radio mentor is commonly said to be a 1971 QST column?
- … that in the phonetic alphabet, 9 is spoken as "niner" to separate it from "five" and from the German "nein"?
- … that Jamboree on the Air grew from a 1957 idea by British amateur Leslie Mitchell, G3BHK, and was first officially held in 1958?
- … that Swan Electronics began with ten single-band transceivers built in a garage in Benson, Arizona, nine for 20 meters and one for 40?
- … that the Numerical Electromagnetics Code, whose NEC-2 version sits underneath most amateur antenna-modeling programs, was developed at Lawrence Livermore National Laboratory for the US Navy?