XEWV-FM is a radio station in Mexicali, Baja California, broadcasting on 106.7 MHz. XEWV-FM received its concession in June 1965 for operation on 89.6 MHz, at the time, Mexico had licensed several radio stations on even decimal FM frequencies, which were never used in the United States. By 1970, all of the even decimal stations had been relocated to odd-numbered frequencies or had disappeared, in 1974, Cadena Baja California bought XEWV-AM-FM. After 27 years of regional Mexican music as Fiesta Mexicana, on September 9,2011, XEWV-FM flipped to the More FM format, which debuted in Tijuana on sister station XHMORE-FM in 1994
In broadcasting and radio communications, a call sign is a unique designation for a transmitter station. In North America, they are used for all FCC licensed transmitters, a call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a stations identity. The use of signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one line linking all railroad stations. In order to time, two-letter identifiers were adopted for this purpose. This pattern continued in operation, radio companies initially assigned two-letter identifiers to coastal stations and stations aboard ships at sea. These were not globally unique, so a company identifier was added. Merchant and naval vessels are assigned call signs by their national licensing authorities, in the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters.
United States merchant vessels are given call signs beginning with the letters W or K while US naval ships are assigned callsigns beginning with N, leisure craft with VHF radios may not be assigned call signs, in which case the name of the vessel is used instead. Ships in the US wishing to have a radio licence anyway are under F. C. C, class SA, Ship recreational or voluntarily equipped. Those calls follow the land mobile format of the initial letter K or W followed by 1 or 2 letters followed by 3 or 4 numbers. U. S. Coast Guard small boats have a number that is shown on both bows in which the first two digits indicate the length of the boat in feet. For example, Coast Guard 47021 refers to the 21st in the series of 47 foot motor lifeboats, the call sign might be abbreviated to the final two or three numbers during operations, for example, Coast Guard zero two one. Call signs in aviation are derived from several different policies, depending upon the type of flight operation, in most countries, unscheduled general aviation flights identify themselves using the call sign corresponding to the aircrafts registration number.
In this case, the sign is spoken using the International Civil Aviation Organization phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix, for example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa. However, in the United States a pilot of an aircraft would normally omit saying November, at times, general aviation pilots might omit additional preceding numbers and use only the last three numbers and letters. This is especially true at uncontrolled fields when reporting traffic pattern positions, for example, Skyhawk eight-Charlie-Papa, left base
FM broadcasting is a method of radio broadcasting using frequency modulation technology. Invented in 1933 by American engineer Edwin Armstrong, it is used worldwide to provide high-fidelity sound over broadcast radio, FM broadcasting is capable of better sound quality than AM broadcasting, the chief competing radio broadcasting technology, so it is used for most music broadcasts. FM radio stations use the VHF frequencies, the term FM band describes the frequency band in a given country which is dedicated to FM broadcasting. Throughout the world, the FM broadcast band falls within the VHF part of the radio spectrum. Usually 87.5 to 108.0 MHz is used, or some portion thereof, with few exceptions, In the former Soviet republics, and some former Eastern Bloc countries, assigned frequencies are at intervals of 30 kHz. This band, sometimes referred to as the OIRT band, is slowly being phased out in many countries, in those countries the 87. 5–108.0 MHz band is referred to as the CCIR band. In Japan, the band 76–95 MHz is used, the frequency of an FM broadcast station is usually an exact multiple of 100 kHz.
In most of South Korea, the Americas, the Philippines, in some parts of Europe and Africa, only even multiples are used. In the UK odd or even are used, in Italy, multiples of 50 kHz are used. There are other unusual and obsolete FM broadcasting standards in countries, including 1,10,30,74,500. Random noise has a triangular spectral distribution in an FM system and this can be offset, to a limited extent, by boosting the high frequencies before transmission and reducing them by a corresponding amount in the receiver. Reducing the high frequencies in the receiver reduces the high-frequency noise. These processes of boosting and reducing certain frequencies are known as pre-emphasis and de-emphasis, the amount of pre-emphasis and de-emphasis used is defined by the time constant of a simple RC filter circuit. In most of the world a 50 µs time constant is used, in the Americas and South Korea,75 µs is used. This applies to both mono and stereo transmissions, for stereo, pre-emphasis is applied to the left and right channels before multiplexing.
They cannot be pre-emphasized as much because it would cause excessive deviation of the FM carrier, systems more modern than FM broadcasting tend to use either programme-dependent variable pre-emphasis, e. g. dbx in the BTSC TV sound system, or none at all. Long before FM stereo transmission was considered, FM multiplexing of other types of audio level information was experimented with. Edwin Armstrong who invented FM was the first to experiment with multiplexing and these original FM multiplex subcarriers were amplitude modulated
XED-AM is a radio station in Mexicali, Baja California, part of the Yuma, Arizona and El Centro, California radio markets. It is owned by Radiorama and is known as La Gran D, prior to the sign-on of XED, the callsign belonged to perhaps the first radio station in Mexico to be considered a border blaster. XED-AM was originally located at Reynosa and was under the sales management of the International Broadcasting Company. Located across the Rio Grande from McAllen, Texas, USA, the current XED received its concession in May 1947. Wolfman Jacks old station howling once again, – Dallas Times Herald, January 2,1983. – primarily about XERF but it includes information on the border-blasters. Border Radio, by Fowler and Crawford, Bill,1987 ISBN 0-87719-066-6 Mass Media Moments in the United Kingdom, the USSR and the USA, by Gilder, Eric. – Lucian Blaga University of Sibiu Press, Romania,2003 ISBN 973-651-596-6 Query the FCCs AM station database for XED Radio-Locator Information on XED
XEMMM-AM is a radio station in Mexicali, Baja California, broadcasting on 940 kHz. XEWV-AM received its concession in March 1955, in 1974, Cadena Baja California bought XEWV-AM-FM. The callsign was changed to XEMMM-AM in 2003 after the Tijuana station that held those calls became XESPN-AM, not long after, CBC sold XEMMM to Organización Editorial Mexicana, which had bought 820 AM at the same time
Tijuana is the largest city in Baja California and on the Baja California Peninsula and center of the Tijuana metropolitan area, part of the international San Diego–Tijuana metropolitan area. As an industrial and financial center of Mexico, Tijuana exerts an influence on economics, culture, art. As the city has become a center in the country, so has the surrounding metropolitan area. Currently one of the fastest growing areas in Mexico, Tijuana maintains global city status. As of 2015, the city of Tijuana had a population of 1,696,923, Tijuana is located on the Gold Coast of Baja California, and is the municipal seat and cultural and commercial center of Tijuana Municipality. Tijuana covers 70% of the municipality but contains over 80% of its population, a dominant manufacturing center of the North American continent, the city maintains facilities of many multinational conglomerate companies. In the early 21st century, Tijuana became the medical-device manufacturing capital of North America, Tijuana is a growing cultural center and has been recognized as an important new cultural mecca.
The city is the most visited city in the globe. More than fifty million people cross the border between two cities every year. This metropolitan crossing makes the San Ysidro Port of Entry the busiest land-border crossing in the world and it is estimated that the two border crossing stations between the cities proper of San Diego and Tijuana account for 300,000 daily border crossings alone. Tijuana is the 40th largest city in the Americas and is the westernmost city in Mexico, Tijuana traces its modern history to the arrival of Spanish explorers in the 16th century who were mapping the coast of the Californias. As the American conquest of northern Mexico ended with the Treaty of Guadalupe Hidalgo, Tijuanas new international position on the border gave rise to a new economic, the city was founded in July 11,1889 as urban development began. Often known by its initials, T. J. and nicknamed Gateway to Mexico, Tijuana derives from the Kumeyaay word Tiwan, meaning by-the-sea. Common in regional folklore, a myth exists purporting that the name is a conjunction of Tia Juana, Tia Juana would provide food and a resting place to travelers on their journeys.
The story has become a myth with residents of the city and has particular resonance among those who like to imagine the city as a place of hospitality. In Spanish, the name is pronounced /tiˈxwana/ – with three syllables, and a fricative as represented by the sound written as j. In California, and particularly in Southern California, it is referred to as T. J. Baja Californians have adopted this pronunciation as Tiyei, in Spanish the demonym for someone from Tijuana is Tijuanense, while in English the demonym is Tijuanan
XHMIX-FM is a commercial radio station located in La Rumorosa, Baja California, broadcasting to the Imperial Valley, California area of the United States on 98.3 FM. XHMIX airs a Contemporary hit radio format branded as Power 98 Jams. The 98.3 frequency in Rumorosa was put out for bid in 1992 as XHRBN-FM, francisco Javier Fimbres Durazo, who already ran XEKT1390 AM in Tecate, won the concession and built the station, quickly changing the callsign to XHFJ-FM for his initials. During this time, Fimbres operated his stations in association with Cadena Baja California, in 2003, XHFJ became XHMIX-FM to go with the stations name at the time, Mix 98. The station known as Zona 98 with a rock format. The current concessionaire, controlled 60% by Fimbres Durazo, was created in 2007, official Website Power98 XHMIX-FM on Facebook Power98 XHMIX-FM on Twitter
Frequency is the number of occurrences of a repeating event per unit time. It is referred to as frequency, which emphasizes the contrast to spatial frequency. The period is the duration of time of one cycle in a repeating event, for example, if a newborn babys heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as vibrations, audio signals, radio waves. For cyclical processes, such as rotation, oscillations, or waves, in physics and engineering disciplines, such as optics and radio, frequency is usually denoted by a Latin letter f or by the Greek letter ν or ν. For a simple motion, the relation between the frequency and the period T is given by f =1 T. The SI unit of frequency is the hertz, named after the German physicist Heinrich Hertz, a previous name for this unit was cycles per second. The SI unit for period is the second, a traditional unit of measure used with rotating mechanical devices is revolutions per minute, abbreviated r/min or rpm.
As a matter of convenience and slower waves, such as ocean surface waves and fast waves, like audio and radio, are usually described by their frequency instead of period. Spatial frequency is analogous to temporal frequency, but the axis is replaced by one or more spatial displacement axes. Y = sin = sin d θ d x = k Wavenumber, in the case of more than one spatial dimension, wavenumber is a vector quantity. For periodic waves in nondispersive media, frequency has a relationship to the wavelength. Even in dispersive media, the frequency f of a wave is equal to the phase velocity v of the wave divided by the wavelength λ of the wave. In the special case of electromagnetic waves moving through a vacuum, v = c, where c is the speed of light in a vacuum, and this expression becomes, f = c λ. When waves from a monochrome source travel from one medium to another, their remains the same—only their wavelength. For example, if 71 events occur within 15 seconds the frequency is, the latter method introduces a random error into the count of between zero and one count, so on average half a count.
This is called gating error and causes an error in the calculated frequency of Δf = 1/, or a fractional error of Δf / f = 1/ where Tm is the timing interval. This error decreases with frequency, so it is a problem at low frequencies where the number of counts N is small, an older method of measuring the frequency of rotating or vibrating objects is to use a stroboscope