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FM: The FM radio band was established on January 1, 1941, and from the beginning educational stations received standard unique four-letter call signs. Commercial stations within the original FM band were assigned transmitting frequencies that spanned from 43.1 MHz to 49.9 MHz, and the FCC initially issued these stations standardized call signs ...
In Mexico, AM radio stations use XE call signs (such as XEW-AM), while the majority of FM radio and television stations use XH.Broadcast callsigns are normally four or five letters in length, plus the -FM or -TV suffix where applicable, though several older stations have only three letters.
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.
Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).
A call sign composed of a letter, two digits, and one-letter is always a 2×1 call sign, meaning it has a letter-digit prefix and a single-letter suffix. for all letter-digit-digit-letter callsigns, if the first character is other than B, F, G, I, K, M, N, R, or W then it is a 2×1 call sign; PNSS, 1×2 call sign prefix always a letter, suffix ...
Initially most broadcasting stations were assigned three-letter calls; however, a switch was made in April 1922 to primarily four-letter calls, after the number of stations had increased into the hundreds. For a few years thereafter a small number of new three-letter calls continued to be issued.
Unused suffixes can be used for other call signs that do not fall into the standard call sign matrix, for example the unused 33A call sign is used to refer to the Company Sergeant Major. The letter part of the call sign is not the company's letter (B vs F in the above example).
Similarly, WEZU, the international radio call sign of the ship SS Lash Atlantico, was assigned in 1997 to a broadcast station. [4] Additional call signs would be reassigned to coastal stations or moved from marine radio to terrestrial broadcast radio when ships were sold for registration to foreign nations, as the new owners would obtain new ...