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CQ (call)
CQ is a code used by wireless operators, particularly those communicating in Morse code, (), but also by voice operators, to make a general call (called a ''CQ call''). Transmitting the letters ''CQ'' on a particular radio frequency is an invitation for any operators listening on that frequency to respond. It is still widely used in amateur radio. History and usage The CQ call was originally used by landline telegraphy operators in the United Kingdom. French was, and still is, the official language for international postal services, and the word sécurité was used to mean "safety" or "pay attention". It is still used in this sense in international telecommunications. The letters CQ, when pronounced in French, resemble the first two syllables of ', and were therefore used as shorthand for the word. It sounds also like the French "c'est qui?", which means "who's there?". In English-speaking countries, the origin of the abbreviation was popularly changed to the phrase "seek you" o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CQ De DG2RBH
CQ may refer to: Arts and entertainment * ''CQ'' (film), a 2001 film * '' La CQ'', a Cartoon Network sitcom * Cinémathèque québécoise, a Montreal film museum People * CQ (playwright) or C. Quintana, a Cuban-American playwright, poet, and writer Places * Central Queensland (geographical division of Queensland) * Chongqing, China (Guobiao abbreviation CQ) * Northern Mariana Islands (FIPS Pub 10-4 or obsolete NATO digram CQ) Publications * ''CQ Amateur Radio'' * '' CQ ham radio'' * CQ Press, a US publisher in government and politics *''The China Quarterly'', a journal published by Cambridge University Press * Congressional Quarterly, a US publishing company Science and technology * Conjunctive query, in relational databases and database theory * CQ (call), in radio communications, a general call, to anyone who receives it * Norinco CQ, a variant of the AR-15 rifle * ''Cissus quadrangularis'', medicinal plant from the grape family * Adobe Experience Manager, formerly CQ, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Call Sign
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique identifier for a transmitter station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity. The use of call signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one telegraph line linking all railroad stations, there needed to be a way to address each one when sending a telegram. In order to save time, two-letter identifiers were adopted for this purpose. This pattern continued in radiotelegraph operation; radio companies initially assigned two-letter identifiers to coastal stations and stations onboard ships at sea. These were not globally unique, so a one-letter company identifier (for instance, 'M' and two letters as a Marconi station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Postal Union
The Universal Postal Union (UPU, french: link=no, Union postale universelle), established by the Treaty of Bern of 1874, is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations, in addition to the worldwide postal system. The UPU contains four bodies consisting of the Congress, the Council of Administration (CA), the Postal Operations Council (POC) and the International Bureau (IB). It also oversees the Telematics and Express Mail Service (EMS) cooperatives. Each member agrees to the same terms for conducting international postal duties. The UPU's headquarters are located in Bern, Switzerland. History Bilateral treaties Before the establishment of the UPU, every pair of countries that exchanged mail had to negotiate a postal treaty with each other. In the absence of a treaty providing for direct delivery of letters, mail had to be forwarded through an intermediate country. Postal arrangements were complex and overlapping. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Q Code
The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially amateur radio. To distinguish the use of a Q-code transmitted as a question from the same Q-code transmitted as a statement, operators either prefixed it with the military network question marker "" (dit dit dah dit dah) or suffixed it with the standard Morse question mark (dit dit dah dah dit dit). Although Q-codes were created when radio used Morse code exclusively, they continued to be employed after the introduction of voice transmissions. To avoid confusion, transmitter call signs are restricted; no country is ever issued an ITU prefix starting with "Q". Codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services. "Q" has no official meaning, but it is sometimes assign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CQ Ham Radio
''CQ ham radio'' is a monthly amateur radio enthusiast magazine published in Japan. The magazine is published in Japanese and draws its subscription base primarily from Japan. The name of the magazine is derived from the international amateur radio call CQ, used to indicate that the station making the call is available for communications with any other station. ''CQ ham radio'' is not associated with the similarly named United States magazine ''CQ Amateur Radio ''CQ Amateur Radio'' (also known simply as ''CQ'' or ''CQ magazine'', and formerly as ''CQ: The Radio Amateur's Journal'') is a magazine for amateur radio enthusiasts first published in 1945. The English language edition is read worldwide; Spani ...''. References External links Official website 1946 establishments in Japan Amateur radio magazines Magazines published in Japan Monthly magazines published in Japan Magazines established in 1946 {{Japan-mag-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CQ Amateur Radio
''CQ Amateur Radio'' (also known simply as ''CQ'' or ''CQ magazine'', and formerly as ''CQ: The Radio Amateur's Journal'') is a magazine for amateur radio enthusiasts first published in 1945. The English language edition is read worldwide; Spanish language edition is published in Spain with some translation Translation is the communication of the Meaning (linguistic), meaning of a #Source and target languages, source-language text by means of an Dynamic and formal equivalence, equivalent #Source and target languages, target-language text. The ...s of articles from the English language edition and some original European content. The magazine was also published in France with partial translation of the original edition between 1995 and 2000 (ISSN 1267-2750). Published by CQ Communications, the title is based on the CQ (call), CQ call. Contests and awards ''CQ Amateur Radio'' organizes, adjudicates, and publishes the results of several annual Contesting, radio competit ... [...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] |
Slim Gaillard
Bulee "Slim" Gaillard (January 9, 1911 – February 26, 1991), also known as McVouty, was an American jazz singer and songwriter who played piano, guitar, vibraphone, and tenor saxophone. Gaillard was noted for his comedic vocalese singing and word play in his own constructed language called "Vout-o-Reenee", for which he wrote a dictionary. In addition to English, he spoke five languages (Spanish, German, Greek, Arabic, and Armenian) with varying degrees of fluency. He rose to prominence in the late 1930s with hits such as " Flat Foot Floogie (with a Floy Floy)" and "Cement Mixer (Put-Ti-Put-Ti)" after forming Slim and Slam with Leroy Eliot "Slam" Stewart. During World War II, Gaillard served as a bomber pilot in the Pacific. In 1944, he resumed his music career and performed with such notable jazz musicians as Charlie Parker, Dizzy Gillespie, and Dodo Marmarosa. In the 1960s and 1970s, he acted in films—sometimes as himself—and also appeared in bit parts in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency Modulation
Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and Run-length limited#FM: .280.2C1.29 RLL, computing. In Analog signal, analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the instantaneous frequency deviation, i.e. the difference between the frequency of the carrier and its center frequency, has a functional relation to the modulating signal amplitude. Digital data can be encoded and transmitted with a type of frequency modulation known as frequency-shift keying (FSK), in which the instantaneous frequency of the carrier is shifted among a set of frequencies. The frequencies may represent digits, such as '0' and '1'. FSK is widely used in computer modems, such as fax modems, telephone caller ID systems, garage door openers, and other low-frequency transmissions. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spurious Emission
In radio communication, a spurious emission is any component of a radiated radio frequency signal the complete suppression of which would not impair the integrity of the modulation type or the information being transmitted. A radiated signal outside of a transmitter's assigned channel is an example of a spurious emission. Spurious emissions can include harmonic emissions, intermodulation products and frequency conversion products. See also *Interference (communication) *Radio spectrum pollution Radio spectrum pollution is the straying of waves in the radio and electromagnetic spectrums outside their allocations that cause problems for some activities. It is of particular concern to radio astronomers. Radio spectrum pollution is mitiga ... References Radio technology {{radio-comm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless Telegraphy
Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term ''wireless telegraphy'' was also used for other experimental technologies for transmitting telegraph signals without wires. In radiotelegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code. In a manual system, the sending operator taps on a switch called a telegraph key which turns the transmitter on and off, producing the pulses of radio waves. At the receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code. Radiotelegraphy was the first means of radio communication. The first practical radio transmitters and receivers invented in 1894–1895 by Guglielmo Marconi used radiotelegraphy. It continued to be the only type of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-sideband Modulation
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently. Amplitude modulation produces an output signal the bandwidth of which is twice the maximum frequency of the original baseband signal. Single-sideband modulation avoids this bandwidth increase, and the power wasted on a carrier, at the cost of increased device complexity and more difficult tuning at the receiver. Basic concept Radio transmitters work by mixing a radio frequency (RF) signal of a specific frequency, the carrier wave, with the audio signal to be broadcast. In AM transmitters this mixing usually takes place in the final RF amplifier (high level modulation). It is less common and much less efficient to do the mixing at low power and then amplify it in a linear ampl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
