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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.
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 ...
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.
United States National Radio Quiet Zone. Coordinates: 38.375°N 79.5°W. The NRQZ includes portions of West Virginia, Virginia, and a small part of Maryland. The National Radio Quiet Zone ( NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are restricted by law to facilitate ...
APRS beacon transmitter with GPS receiver. 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 ...
The Maidenhead Locator System (a.k.a. QTH Locator and IARU Locator) is a geocode system used by amateur radio operators to succinctly describe their geographic coordinates, which replaced the deprecated QRA locator, which was limited to European contacts. [ 1] Its purpose is to be concise, accurate, and robust in the face of interference and ...
Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode. Hellschreiber, also referred to as either Feld-Hell, or Hell a facsimile-based teleprinter. Discrete multi-tone modulation modes such as Multi Tone 63 (MT63) Multiple frequency-shift keying (MFSK) modes such as. FSK441, JT6M, JT65, and FT8.