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Wire Signal
A wire signal is a brevity code used by telegraphers to save time and cost when sending long messages. The most well-known of these was the 92 Code adopted by Western Union in 1859. The reason for this adoption was to reduce bandwidth usage over the telegraph lines and speed transmissions by utilizing a numerical code system for various frequently used phrases. 92 Code Several of the codes are taken from ''The Telegraph Instructor'' by G.M. Dodge. Dodge notes: :Other numerical signals are used by different railroads for different purposes, for instance, the signal “47” upon some railroads means “display signals”; while the signal “48” means “signals are displayed”. The numerals “9” and “12” are frequently used for “correct”. Other numerals are used for the different officials’ messages, agents’ messages, etc. Codes that are not listed in the 1901 edition of Dodge are marked with an asterisk (*). In the above list, the numbers 19 and 31 refer t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brevity Code
Brevity codes are used in amateur radio, maritime, aviation and military communications. The codes are designed to convey complex information with a few words or codes. Some terms are classified to the public. List of brevity codes * ACP-131 Allied military brevity codes * ARRL Numbered Radiogram * Commercial codes such as the '' Acme Commodity and Phrase Code'', the ''ABC Telegraphic Code'', ''Bentley's Complete Phrase Code'', and ''Unicode'' * Fox (code word) * Multiservice tactical brevity code used by various military forces. The codes' procedure words, a type of voice procedure, are designed to convey complex information with a few words, when brevity is required but security is not * Ten-code, North American police brevity codes, including such notable ones as 10-4 * Phillips Code * NOTAM Code * Wire signal, Morse Code abbreviation, also known as 92 Code. Appears in informal language-independent HAM conversations * World War II Allied names for Japanese aircraft See als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Union
The Western Union Company is an American multinational financial services company, headquartered in Denver, Colorado. Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, the company changed its name to the Western Union Telegraph Company in 1856 after merging with several other telegraph companies. The company dominated the American telegraphy industry from the 1860s to the 1980s, pioneering technology such as telex and developing a range of telegraph-related services (including wire money transfer) in addition to its core business of transmitting and delivering telegram messages. After experiencing financial difficulties, Western Union began to move its business away from communications in the 1980s and increasingly focused on its money transfer services. The company ceased its communications operations completely in 2006, at which time The New York Times described it as "the world's largest money-transfer business" and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandwidth (signal Processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in hertz, and depending on context, may specifically refer to ''passband bandwidth'' or ''baseband bandwidth''. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency. Bandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy and is one of the determinants of the capacity of a given communication channel. A key characteristic of bandwidth is that any band of a given width can carry the same amount of information, regardless of where that band is located in the frequency spectrum. For example, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Telegraph
Electrical telegraphs were point-to-point text messaging systems, primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called ''telegraphs'', that were devised to communicate text messages quicker than physical transportation. Electrical telegraphy can be considered to be the first example of electrical engineering. Text telegraphy consisted of two or more geographically separated stations, called telegraph offices. The offices were connected by wires, usually supported overhead on utility poles. Many different electrical telegraph systems were invented, but the ones that became widespread fit into two broad categories. The first category consists of needle telegraphs in which a needle pointer is made to move electromagnetically with an electric current sent down the telegraph line. Early systems used multiple needles requiring multiple wires. The first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Train Order Operation
A train order is "an order issued by or through a proper railway official to govern the movement of trains". Train order operation is the system by which trains are safely moved by train orders. It is distinguished from other forms of train operation in which the authority to move trains is given by fixed signals or Cab signalling. Train order operation, or more accurately timetable and train order operation, was the standard operational system used by the railroads of North America before the days of centralized traffic control, direct traffic control, and the use of track warrants conveyed by radio. The system used a set of rules when direct communication between train dispatchers and trains was limited or non-existent. Trains would follow a predetermined operating plan, known as the timetable, unless superseded by train orders conveyed to the train from the dispatcher, through local intermediaries. Train order operation was a system that required minimum human overhead in an e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
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. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;" (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and '' amateur-satellite service'') is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign, which mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
-30-
-30- has been traditionally used by journalists in North America to indicate the end of a story or article that is submitted for editing and typesetting. It is commonly employed when writing on deadline and sending bits of the story at a time, via telegraphy, teletype, electronic transmission, or paper copy, as a necessary way to indicate the end of the article. It is also found at the end of press releases. There are many theories as to how the usage came into being, and why it is found in North America but not in other Anglophone nations. One theory is that the journalistic employment of -30- originated from the number's use during the American Civil War era in the 92 Code of telegraphic shorthand, where it signified the end of a transmission and that it found further favor when it was included in the Phillips Code of abbreviations and short markings for common use that was developed by the Associated Press wire service. Telegraph operators familiar with numeric wire signals su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Young Ladies Radio League
The Young Ladies Radio League (YLRL) is an international non-profit organization of women amateur radio enthusiasts. It was founded in 1939 and is affiliated with the American Radio Relay League. The term "Young Lady" derives from a Morse code abbreviation, YL, that is used to refer to female amateur radio operators, regardless of age. (As male operators of any age are addressed as OM or "old man", the non-licensed spouse of an OM is often called an XYL.) The Young Ladies' Radio League welcomes all licensed amateur radio women as members. The YLRL is organized into 10 districts in the United States (that correspond to the 10 amateur radio call sign districts), a district for Canada, and a "DX" district that covers the rest of the world. The YLRL holds a tri-annual convention at various locations. Services The YLRL provides many services for its members including publishing a bimonthly newsletter, ''YL Harmonics''. It also provides an audio tape version of ''YL Harmonics'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland, Tuscarawas Valley And Wheeling Railway
Cleveland, Tuscarawas Valley and Wheeling Railway operated in eastern Ohio and West Virginia from 1875 to 1882. The Lakeshore and Tuscarawas Valley Railway Company organized by filing with the Ohio Secretary of State on July 2, 1870 to build a road from near Berea to Mill Township, Tuscarawas County, Ohio where it would interchange with the Pittsburgh, Cincinnati and St. Louis Railway, with a branch to Elyria. The road was completed in August 1873 from Elyria through Grafton, Massillon, and New Philadelphia to Uhrichsville. On October 30, 1872, the company purchased the Elyria and Black River Railroad forming a line from Uhrichsville to Lorain on Lake Erie. The Lakeshore and Tuscarawas Valley Railway Company filed a certificate March 3, 1873 to extend a line from Uhrichsville into Washington Township, Harrison County. Foreclosure was filed on the railroad July, 1874, for $2,180,000 debt, and it sold for one million dollars January 26, 1875, to a company that incorporated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland, Ohio
Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U.S. maritime border with Canada, northeast of Cincinnati, northeast of Columbus, and approximately west of Pennsylvania. The largest city on Lake Erie and one of the major cities of the Great Lakes region, Cleveland ranks as the 54th-largest city in the U.S. with a 2020 population of 372,624. The city anchors both the Greater Cleveland metropolitan statistical area (MSA) and the larger Cleveland–Akron–Canton combined statistical area (CSA). The CSA is the most populous in Ohio and the 17th largest in the country, with a population of 3.63 million in 2020, while the MSA ranks as 34th largest at 2.09 million. Cleveland was founded in 1796 near the mouth of the Cuyahoga River by General Moses Cleaveland, after whom the city was named ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morse Code Abbreviations
Morse code abbreviations are used to speed up Morse communications by foreshortening textual words and phrases. Morse abbreviations are short forms, representing normal textual words and phrases formed from some (fewer) characters taken from the word or phrase being abbreviated. Many are typical English abbreviations, or short acronyms for often-used phrases. Distinct from prosigns and commercial codes Morse code abbreviations are not the same as prosigns. Morse abbreviations are composed of (normal) textual alpha-numeric character symbols with normal Morse code inter-character spacing; the character symbols in abbreviations, unlike the delineated character groups representing Morse code prosigns, are not "run together" or concatenated in the way most prosigns are formed. Although a few abbreviations (such as for "dollar") are carried over from former commercial telegraph codes, almost all Morse abbreviations are ''not'' commercial codes. From 1845 until well into the second h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phillips Code
The Phillips Code is a brevity code (shorthand) created in 1879 by Walter P. Phillips (then of the Associated Press) for the rapid transmission of press reports by telegraph. It defined hundreds of abbreviations and initialisms for commonly used words that news authors and copy desk staff would commonly use. There were subcodes for commodities and stocks called the Market Code, a Baseball Supplement, and single-letter codes for Option Months. The last official edition was published in 1925, but there was also a Market supplement last published in 1909 that was separate. The code consists of a dictionary of common words or phrases and their associated abbreviations. Extremely common terms are represented by a single letter (C: See; Y: Year); those less frequently used gain successively longer abbreviations (Ab: About; Abb: Abbreviate; Abty: Ability; Acmpd: Accompanied). Later, The Evans Basic English Code expanded the 1,760 abbreviations in the Phillips Code to 3,848 abbreviat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
