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Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...
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 ...
Open Location Code. The Open Location Code ( OLC) is a geocode based in a system of regular grids for identifying an area anywhere on the Earth. [1] It was developed at Google's Zürich engineering office, [2] and released late October 2014. [3] Location codes created by the OLC system are referred to as " plus codes ".
Area codes 214, 469, 972, and 945 are telephone area codes in the North American Numbering Plan (NANP) for Dallas, Texas and most of the eastern portion of the Dallas–Fort Worth metroplex. The area codes are assigned in an overlay complex to a single numbering plan area that was the core of one of the original area codes of 1947, area code 214.
Seattle, Shoreline, Lake Forest Park, Mercer Island, Bainbridge Island, Vashon Island. Original statewide area code until 1957, when area code 509 was created for Eastern Washington. Further splits in 1995 to create area code 360 for most of Western Washington, and 1997 to form area codes 253 and 425. 564 will be added to the 206 area in 2025. 509.
The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.
The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667. The state of Maryland is served by the following area codes: Area codes. Numbering plan area. 227.
The U.S. state of Alabama is served by six area codes. When the North American Numbering Plan was first defined in 1947, Alabama was a single numbering plan area (NPA), with area code 205. This configuration existed until 1995 when area code 334 was added for the southeastern part of the state. In 1998, area code 256 was assigned for northern ...
Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas. The date of establishment of each area code is indicated in parentheses: 210: San Antonio area; overlays with 726 (November 1, 1992) 214: Dallas area, overlays with 469, 972, and 945 (October 1947)
Minnesota was divided into a south-eastern area including the Twin-Cities with area code 612 and the rest of the state in the south-west, north, and north-east with area code 218. In 1954, the southern half of 612 was designated a separate numbering plan area with area code 507 as the third area code for the state. See also