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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).
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(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]
WYTS was first licensed, as WMAN, to the Broad Street Baptist Church in downtown Columbus on October 5, 1922. [3] The original call letters were randomly assigned from a sequential roster of available call signs. Studios and transmitter were located within the church, and its initial schedule was only a few hours of church services each Sunday.
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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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