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The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's readability, strength, and tone. [1] [2] The code was developed in 1934 ...
Amateur First Grade required an essay-type examination and five (later ten) words per minute code examination before a Radio Inspector at one of the Department's field offices. This class of license was renamed Amateur Class in 1927 and then Amateur First Class in 1932. Amateur Radio licensing in the United States began in mid-December 1912.
Automatic Packet Reporting System (APRS) is an amateur radio-based system for real time digital communications of information of immediate value in the local area. [1] Data can include object Global Positioning System (GPS) coordinates Non-directional beacon , weather station telemetry, text messages, announcements, queries, and other telemetry .
Worldwide. The Military Auxiliary Radio System ( MARS) is a United States Department of Defense sponsored program, established as a separately managed and operated program by the United States Army and the United States Air Force. The United States Navy-Marine Corps program closed in 2015. The program is a civilian auxiliary consisting ...
The COMMCOM has a staff of approximately 100 people that execute contingency communications, conduct communications training aboard Coast Guard cutters, and operate the following stations: COMMCOM Chesapeake, Virginia: call sign NMN (directly) RCF Miami, Florida: call sign NMA (remotely) RCF Boston, Massachusetts: call sign NMF (remotely) RCF ...
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. [1] The term "amateur" is used to specify "a duly authorized person interested in radioelectric ...
Call signs in the United States. Call signs in the United States are identifiers assigned to radio and television stations, which are issued by the Federal Communications Commission (FCC) and, in the case of most government stations, the National Telecommunications and Information Administration (NTIA). They consist of from 3 to 9 letters and ...
An amateur radio station may be operated under the call sign of the owner of the station (if they are near the controls), or the call sign of the person operating the station as a guest. In some countries, special call signs might be made available for clubs, and are frequently used at a club station established for use of the club's members.