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- … that DCS squelch codes are written as octal numbers, so the digits 8 and 9 never appear?
- … that RTTY's "mark" and "space" come from wire telegraphy, where current flowing in the line marked the paper tape?
- … that a 40-meter dipole often works on the 15-meter band too, because 21 MHz is three times 7 MHz?
- … that the geostationary satellite QO-100 relays signals sent near 2.4 GHz but is not visible from North America? See UHF.
- … that the Hallicrafters HT-4 transmitter was adapted as the BC-610, the heart of the US Army's truck-mounted SCR-299 radio station?
- … that screwdriver antennas, a type of HF mobile antenna, are named for the cordless-screwdriver motor used in early designs?
