Template:Did you know/19
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- … that MFJ Enterprises began in 1972 with a CW filter kit made in a room of a Starkville hotel?
- … that a variable capacitor with a 10-to-1 capacitance range tunes a circuit over only about 3.2 to 1 in frequency? See Resonance and Q.
- … that the Maidenhead Locator System of grid squares is named after the town west of London where European VHF managers agreed on it in 1980?
- … that a US ham visiting Canada adds the local prefix after the call sign, as in W0ABC/VE3, though most countries put it before? See Call signs.
- … that on a contest weekend the 17-meter band is a refuge for ordinary conversations, because by worldwide convention contests are not held on the WARC bands?
- … that trans-equatorial propagation links the southern US with Argentina because in the Americas the geomagnetic equator lies south of the geographic one?