Quote:
Originally Posted by KentTeffeteller
... FCC (Federal Communications Commission) rules state that station ID must be given at the top of the hour (a few minutes cushion is allowable)...
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The rules also allow a longer delay if the ID announcement would interrupt a performance such as a symphony.
Wikipedia has a good article on call signs:
https://en.wikipedia.org/wiki/Call_s..._North_America
The W... calls were grandfathered in, as stated, chosen originally for some meaning (e.g., WGN - World's Greatest Newspaper [Chicago Tribune]). The K signs originated with international assignment of K... to the US maritime service, but the FCC also started use for terrestrial stations. KDKA is probably the most famous station that is far east of the Mississippi, but most K... stations are to the west.