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Call sign information for U.S. stations are set out in chapter I of the FCC rules, Title 47 (Telecommunication) of the Code of Federal Regulations (C.F.R.): 47 CFR 2.302: General overview of call sign assignments, including a detailed summary of standards and practices for various license classes.
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 station. These 67 different three-letter call signs are currently grouped as follows: 25 assigned only to an AM station
Following is a list of FCC-licensed community radio stations in the United States, including both full-power and low-power non-commercial educational services. The list is divided into two sections: The list is divided into two sections:
The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a prefix assigned by the International Telecommunication Union (ITU). For example, the United States has been assigned the following prefixes: AAA–ALZ, K, N, W. For a complete list, see international call sign allocations.
QRZ.com is an amateur radio website listing almost every callsign in the world. In 1992, QRZ founder Fred L. Lloyd accessed data from the FCC database to create a CD-ROM with all call signs issued in the United States. [1] A copy of the CD-ROM is carried on board the International Space Station and one was also aboard the Russian Mir space station.
Review of the 88 Expanded Band authorizations made by the Federal Communications Commission on March 17, 1997. [5] In the table below: For the "Original Standard Band Assignment" entries, the FCC's March 17, 1997 notification listed station's call signs and frequencies as of June 30, 1993, dating to when the stations initially notified the commission that they were interested in participating.
Call signs almost always have one of the following forms: PNS, 1×1 call sign usually for a special event, the prefix is always a single letter character, as is the suffix. Can only be assigned in the B, F, G, I, K, M, N, R, or W prefix range. (See discussion on the D9K call sign issued by Korea above – 'when 2 characters are needed'.)
In the United States they are also used in the callsigns of low-powered FM translators relaying AM or FM station signals. For example, the "237" in the callsign for translator K237FR in Tumwater, Washington indicates that the station is transmitting on channel 237, which corresponds to 95.3 MHz.