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A standard channel letter is a three-dimensional graphic sign element. Its channel is fabricated from sheet metal, most often aluminum since it will not rust. A flat sheet of aluminum is typically cut on a table by a computer-controlled router, laser, or water jet, based on a vector-based art file (.cdr, .eps, .ai, .scv, .sci, or .fs).
(The single-community restriction remains in force for three-letter calls). In 1987, the requirement was further relaxed, now allowing common four-letter base call signs to be issued to stations with different owners, although permission had to first be obtained from the current call letter holder. [3]
As of January 2025, there are a total of 101 AM, FM and TV stations in the United States that are assigned three-letter call signs. This is divided between only 67 different three-letter calls, because in many cases the same call sign is used by more than one station, although a given call sign is never assigned to more than one AM, FM or TV ...
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Examples of pre-1920 stations include 8XK in Pittsburgh, Pennsylvania, which became KDKA in November 1920, and Charles Herrold's series of identifiers from 1909 in San Jose, California: first "This is the Herrold Station" or "San Jose calling", [3] then the call signs FN, SJN, 6XF, and 6XE, then, with the advent of modern call signs, KQW in ...