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Wireless experimenters were in most states by 1897, and the first list of call signs and licensees is from 1911. In 1912 the first system of a designated range for each state was issued by the PMG Department based on an XAA–XZZ block of letters. When all the three letter call signs were issued, provision was made to expand to four (e.g. XAAA).
In 2023 the regulator (ACMA) took over responsibility for amateur radio examinations, using a network of accredited volunteer assessors. ACMA issues call signs to successful candidates. The Australian Maritime College (AMC) now has no involvement with amateur radio examination or call sign allocation.
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.
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 ...
(See discussion on the D9K call sign issued by Korea above – 'when 2 characters are needed'.) PPNS, 2×1 call sign prefix can be letter-letter, letter-digit, or digit-letter. 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.
Broadcast call signs are call signs assigned as unique identifiers to radio stations and television stations. While broadcast radio stations will often brand themselves with plain-text names, identities such as " cool FM ", " rock 105" or "the ABC network" are not globally unique.
Under the ACMA deed 2009–2019, the testing utilised a system of accredited testers, and issued the authorisations for the ACMA to issue licences. [ 14 ] Between mid-1990 and Feb 2019, the WIA delivered amateur radio examinations, issued certificates and related callsign management services.
Pages in category "Amateur radio call signs" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. ...