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- … that early SSTV pictures, a few seconds each, were viewed on long-persistence radar-style display tubes?
- … that some countries, mostly in Europe, have a 4-meter amateur band near 70 MHz that is not available in the US? See VHF.
- … that the ham sign-offs 73 and 88 survive from the numbered codes of 19th-century landline telegraphers? See Ham radio slang.
- … that Mosley Electronics began in the early 1940s with adapters for vacuum-tube sockets made in Carl Mosley's St. Louis basement?
- … that D-STAR's 128-kilobit-per-second DD mode is used only on the 23-centimeter band, because its signal is too wide for the lower bands?
- … that the PL-259 plug and SO-239 socket are together called the UHF connector despite being poor above a few hundred megahertz? See Coaxial cable.
