1906: Radio Call Signals Mar 4, 2020

The International Telecommunications Union (ITU) lays out the conventions for radio, television, Internet and so on. Included in that are the radio call signs, and though these do vary from country to country, each is granted a set of prefixes for stations and amateurs to use as call signs. America was given AAA–ALZ, K, N, W but stations only use K or W. A rule of thumb is that east of the Mississippi river W is used, and west of it K is used, but this is not always the case, as with KDKA based in Pittsburg, which is in the East.
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