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R and S brevity codes, published by the British Post Office in 1908 for coastal wireless stations and ships, superseded in 1912 by Q codes [1] X code, used by European military services as a wireless telegraphy code in the 1930s and 1940s; Z code, also used in the early days of radiotelegraph communication.
The QSA code and QRK code are interrelated and complementary signal reporting codes for use in wireless telegraphy . They replaced the earlier QSJ code. They replaced the earlier QSJ code. Currently, the QSA and QRK codes are officially defined in the ITU Radio Regulations 1990, Appendix 13: Miscellaneous Abbreviations and Signals to Be Used in ...
Phrase Word Brevity Code Phrase word English meaning APCO Ten-code Use Caution Caution: dangerous condition is suspected to exist. 10-0 Unreadable Radio signal is too weak to receive. 10-1 Out of Service Unit, vehicle or person is not working 10-7 In Service Unit, vehicle or person is working but not necessarily "available" or "on radio." 10-8
The following chart lists frequencies on the broadcast company band, and which classes broadcast on these frequencies; Class A and Class B, 10,000 watt and higher (full-time) stations in North America which broadcast on clear-channel station frequencies are also shown.
Information in this chart supersedes that in File:United States Frequency Allocations Chart 2011 - The Radio Spectrum.pdf. Archived at archive.org on 2016-10-30. Licensing
In Indonesia, radio stations are assigned call signs beginning with PM for AM and FM stations or YB-YH for amateur radio stations. Calls beginning with PM are then followed by a number indicating the province where the station is in, the letters B, C, D and F (B for AM stations, C for some stations in Kalimantan , D for some stations in Sumatra ...
Note: Information in the chart has been superseded by the information in File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf, which was downloaded from the US Department of Commerce web site and archived at archive.org.
Conventional radio and television stations almost exclusively use "C" call signs; with the exception of a few commercial radio stations in St. John's, Newfoundland and Labrador which existed prior to the admission of Newfoundland as a province in 1949, the "V" calls are restricted to specialized uses such as amateur radio.