1.
KMVQ-FM
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KMVQ-FM, under the brand as 99-7 Now, is an FM radio station in San Francisco, California in the United States. The station, owned by CBS Radio, broadcasts a Top 40 format, the station transmits its signal from the San Bruno Mountains, while studios are located in downtown San Francisco. KMVQ broadcasts in the HD Radio format, the 99.7 FM frequency was originally owned by NBC, with sister station KNBR. The station signed on the air on October 12,1949 as KNBC-FM, at various times, it aired a middle of the road format as KNBR-FM and an all-news format as KNAI-FM. Years later, this approach would be labeled as Hot adult contemporary, over time, the station migrated to more of a Top 40 format as The Hit Music Station. By 1986, the station migrated back to a contemporary direction. During much of time, KYUUs morning host was Don Bleu. In 1988, NBC decided to all its owned-and-operated radio stations. KYUU was among the last to be sold when Emmis Communications bought the radio station, Emmis made many changes, and due to heavy competition, in October 1988, decided to relaunch the station with a straightforward CHR approach as X-100 and the KXXX call letters. X-100 fared poorly compared to the legacy of KYUU, which led Emmis to sell the station to real estate developer Peter Bedford under his Coast Broadcasting division, X-100 flipped to oldies as KFRC-FM on March 18,1991. The following month, Bedford would buy 610 AM from RKO General, in January 1993, Alliance Broadcasting, a company run by former KYUU general manager John Hayes, would buy KFRC. On August 12,1993,99.7 FM began simulcasting on 610 AM and this was not KFRCs first attempt at FM broadcasting. For many years, KFRC owned an FM counterpart at 106.1 FM, in 1977, KFRCs owners sold off the money-losing FM station at 106.1. Over the next few years, as the FM band eclipsed AM in popularity and this was finally remedied in 1991 under different ownership with the purchase of KXXX. As KFRC,99.7 FM simulcast the format of its well-known sister AM station. The oldies format proved successful in the Bay Area market. In September 1995, Alliance would be out by Infinity Broadcasting. In 2005, Infinity Broadcasting traded 610 AM to Christian radio broadcaster Family Stations, on April 29,2005, Family Stations began simulcasting the signal of their FM station on 610 AM, and the oldies format and KFRC call letters remained at 99.7 FM
2.
San Francisco
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San Francisco, officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations, the California Gold Rush of 1849 brought rapid growth, making it the largest city on the West Coast at the time. San Francisco became a consolidated city-county in 1856, after three-quarters of the city was destroyed by the 1906 earthquake and fire, San Francisco was quickly rebuilt, hosting the Panama-Pacific International Exposition nine years later. In World War II, San Francisco was a port of embarkation for service members shipping out to the Pacific Theater. Politically, the city votes strongly along liberal Democratic Party lines, San Francisco is also the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co. Dolby, Airbnb, Weebly, Pacific Gas and Electric Company, Yelp, Pinterest, Twitter, Uber, Lyft, Mozilla, Wikimedia Foundation, as of 2016, San Francisco is ranked high on world liveability rankings. The earliest archaeological evidence of habitation of the territory of the city of San Francisco dates to 3000 BC. Upon independence from Spain in 1821, the became part of Mexico. Under Mexican rule, the system gradually ended, and its lands became privatized. In 1835, Englishman William Richardson erected the first independent homestead, together with Alcalde Francisco de Haro, he laid out a street plan for the expanded settlement, and the town, named Yerba Buena, began to attract American settlers. Commodore John D. Sloat claimed California for the United States on July 7,1846, during the Mexican–American War, montgomery arrived to claim Yerba Buena two days later. Yerba Buena was renamed San Francisco on January 30 of the next year, despite its attractive location as a port and naval base, San Francisco was still a small settlement with inhospitable geography. The California Gold Rush brought a flood of treasure seekers, with their sourdough bread in tow, prospectors accumulated in San Francisco over rival Benicia, raising the population from 1,000 in 1848 to 25,000 by December 1849. The promise of fabulous riches was so strong that crews on arriving vessels deserted and rushed off to the gold fields, leaving behind a forest of masts in San Francisco harbor. Some of these approximately 500 abandoned ships were used at times as storeships, saloons and hotels, many were left to rot, by 1851 the harbor was extended out into the bay by wharves while buildings were erected on piles among the ships. By 1870 Yerba Buena Cove had been filled to create new land, buried ships are occasionally exposed when foundations are dug for new buildings. California was quickly granted statehood in 1850 and the U. S. military built Fort Point at the Golden Gate, silver discoveries, including the Comstock Lode in Nevada in 1859, further drove rapid population growth. With hordes of fortune seekers streaming through the city, lawlessness was common, and the Barbary Coast section of town gained notoriety as a haven for criminals, prostitution, entrepreneurs sought to capitalize on the wealth generated by the Gold Rush
3.
California
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California is the most populous state in the United States and the third most extensive by area. Located on the western coast of the U. S, California is bordered by the other U. S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. Los Angeles is Californias most populous city, and the second largest after New York City. The Los Angeles Area and the San Francisco Bay Area are the nations second- and fifth-most populous urban regions, California also has the nations most populous county, Los Angeles County, and its largest county by area, San Bernardino County. The Central Valley, an agricultural area, dominates the states center. What is now California was first settled by various Native American tribes before being explored by a number of European expeditions during the 16th and 17th centuries, the Spanish Empire then claimed it as part of Alta California in their New Spain colony. The area became a part of Mexico in 1821 following its war for independence. The western portion of Alta California then was organized as the State of California, the California Gold Rush starting in 1848 led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom. If it were a country, California would be the 6th largest economy in the world, fifty-eight percent of the states economy is centered on finance, government, real estate services, technology, and professional, scientific and technical business services. Although it accounts for only 1.5 percent of the states economy, the story of Calafia is recorded in a 1510 work The Adventures of Esplandián, written as a sequel to Amadis de Gaula by Spanish adventure writer Garci Rodríguez de Montalvo. The kingdom of Queen Calafia, according to Montalvo, was said to be a land inhabited by griffins and other strange beasts. This conventional wisdom that California was an island, with maps drawn to reflect this belief, shortened forms of the states name include CA, Cal. Calif. and US-CA. Settled by successive waves of arrivals during the last 10,000 years, various estimates of the native population range from 100,000 to 300,000. The Indigenous peoples of California included more than 70 distinct groups of Native Americans, ranging from large, settled populations living on the coast to groups in the interior. California groups also were diverse in their organization with bands, tribes, villages. Trade, intermarriage and military alliances fostered many social and economic relationships among the diverse groups, the first European effort to explore the coast as far north as the Russian River was a Spanish sailing expedition, led by Portuguese captain Juan Rodríguez Cabrillo, in 1542. Some 37 years later English explorer Francis Drake also explored and claimed a portion of the California coast in 1579. Spanish traders made unintended visits with the Manila galleons on their trips from the Philippines beginning in 1565
4.
Oakland, California
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Oakland /ˈoʊklənd/ is the largest city and the county seat of Alameda County, California, United States. The city was incorporated in 1852, Oaklands territory covers what was once a mosaic of California coastal terrace prairie, oak woodland, and north coastal scrub. Its land served as a resource when its hillside oak and redwood timber were logged to build San Francisco. In the late 1860s, Oakland was selected as the terminal of the Transcontinental Railroad. Following the 1906 San Francisco earthquake, many San Francisco citizens moved to Oakland, enlarging the citys population, increasing its housing stock and it continued to grow in the 20th century with its busy port, shipyards, and a thriving automobile manufacturing industry. Oakland is known for its sustainability practices, including a top-ranking for usage of electricity from renewable resources, in addition, due to a steady influx of immigrants during the 20th century, along with thousands of African-American war-industry workers who relocated from the Deep South during the 1940s. Oakland is the most ethnically diverse city in the country. The earliest known inhabitants were the Huchiun Indians, who lived there for thousands of years, the Huchiun belonged to a linguistic grouping later called the Ohlone. In Oakland, they were concentrated around Lake Merritt and Temescal Creek, in 1772, the area that later became Oakland was claimed, with the rest of California, by Spanish settlers for the King of Spain. In the early 19th century, the Spanish crown granted the East Bay area to Luis María Peralta for his Rancho San Antonio, the grant was confirmed by the successor Mexican republic upon its independence from Spain. Upon his death in 1842, Peralta divided his land among his four sons, Most of Oakland fell within the shares given to Antonio Maria and Vicente. The portion of the parcel that is now Oakland was called encinal—Spanish for oak grove—due to the oak forest that covered the area. In 1851, three men—Horace Carpentier, Edson Adams, and Andrew Moon—began developing what is now downtown Oakland, on May 4,1852, the Town of Oakland incorporated. Two years later, on March 25,1854, Oakland re-incorporated as the City of Oakland, with Horace Carpentier elected the first mayor, the city and its environs quickly grew with the railroads, becoming a major rail terminal in the late 1860s and 1870s. In 1868, the Central Pacific constructed the Oakland Long Wharf at Oakland Point, a number of horsecar and cable car lines were constructed in Oakland during the latter half of the 19th century. The first electric streetcar set out from Oakland to Berkeley in 1891, at the time of incorporation, Oakland consisted of the territory that lay south of todays major intersection of San Pablo Avenue, Broadway, and Fourteenth Street. The city gradually annexed farmlands and settlements to the east and the north, Oaklands rise to industrial prominence, and its subsequent need for a seaport, led to the digging of a shipping and tidal channel in 1902. This resulted in the town of Alameda being made an island
5.
San Jose, California
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San Jose, officially the City of San José, is the economic, cultural, and political center of Silicon Valley and the largest city in Northern California. With an estimated 2015 population of 1,026,908, it is the third most populous city in California and the tenth most populous in United States. Located in the center of the Santa Clara Valley, on the shore of San Francisco Bay. San Jose is the county seat of Santa Clara County, the most affluent county in California. San Jose is the largest city in both the San Francisco Bay Area and the San Jose-San Francisco-Oakland Combined Statistical Area, which contain 7.7 million and 8.7 million people respectively. Before the arrival of the Spanish, the area around San Jose was inhabited by the Ohlone people, San Jose was founded on November 29,1777, as the Pueblo of San José de Guadalupe, the first civilian town founded in Spanish Alta California. When California gained statehood in 1850, San Jose became the states first capital, following World War II, San Jose experienced an economic boom, with a rapid population growth and aggressive annexation of nearby cities and communities carried out in the 1950s and 60s. The rapid growth of the high-technology and electronics industries further accelerated the transition from a center to an urbanized metropolitan area. Results of the 1990 U. S. Census indicated that San Jose had officially surpassed San Francisco as the most populous city in Northern California, by the 1990s, San Jose and the rest of Silicon Valley had become the global center for the high tech and internet industries. San Jose is considered to be a city, notable for its affluence. San Joses location within the high tech industry, as a cultural, political. San Jose is one of the wealthiest major cities in the United States and the world, and has the third highest GDP per capita in the world, according to the Brookings Institute. Major global tech companies including Cisco Systems, eBay, Adobe Systems, PayPal, Brocade, Samsung, Acer, Prior to European settlement, the area was inhabited by several groups of Ohlone Native Americans. The first lasting European presence began with a series of Franciscan missions established from 1769 by Junípero Serra, San Jose came under Mexican rule in 1821 after Mexico broke with the Spanish crown. It then became part of the United States, after it capitulated in 1846, on March 27,1850, San Jose became the second incorporated city in the state, with Josiah Belden its first mayor. San Jose was Californias first state capital, and hosted the first, today the Circle of Palms Plaza in downtown is the historical marker for the first state capital. The city was a station on the Butterfield Overland Mail route, in the period 1900 through 1910, San Jose served as a center for pioneering invention, innovation, and impact in both lighter-than-air and heavier-than-air flight. These activities were led principally by John Montgomery and his peers, the City of San Jose has established Montgomery Park, a Monument at San Felipe and Yerba Buena Roads, and John J. Montgomery Elementary School in his honor
6.
Frequency
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Frequency is the number of occurrences of a repeating event per unit time. It is also 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, acoustics, 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, longer and slower waves, such as ocean surface waves, short 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, then 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
7.
Hertz
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The hertz is the unit of frequency in the International System of Units and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide proof of the existence of electromagnetic waves. Hertz are commonly expressed in SI multiples kilohertz, megahertz, gigahertz, kilo means thousand, mega meaning million, giga meaning billion and tera for trillion. Some of the units most common uses are in the description of waves and musical tones, particularly those used in radio-. It is also used to describe the speeds at which computers, the hertz is equivalent to cycles per second, i. e. 1/second or s −1. In English, hertz is also used as the plural form, as an SI unit, Hz can be prefixed, commonly used multiples are kHz, MHz, GHz and THz. One hertz simply means one cycle per second,100 Hz means one hundred cycles per second, and so on. The unit may be applied to any periodic event—for example, a clock might be said to tick at 1 Hz, the rate of aperiodic or stochastic events occur is expressed in reciprocal second or inverse second in general or, the specific case of radioactive decay, becquerels. Whereas 1 Hz is 1 cycle per second,1 Bq is 1 aperiodic radionuclide event per second, the conversion between a frequency f measured in hertz and an angular velocity ω measured in radians per second is ω =2 π f and f = ω2 π. This SI unit is named after Heinrich Hertz, as with every International System of Units unit named for a person, the first letter of its symbol is upper case. Note that degree Celsius conforms to this rule because the d is lowercase. — Based on The International System of Units, the hertz is named after the German physicist Heinrich Hertz, who made important scientific contributions to the study of electromagnetism. The name was established by the International Electrotechnical Commission in 1930, the term cycles per second was largely replaced by hertz by the 1970s. One hobby magazine, Electronics Illustrated, declared their intention to stick with the traditional kc. Mc. etc. units, sound is a traveling longitudinal wave which is an oscillation of pressure. Humans perceive frequency of waves as pitch. Each musical note corresponds to a frequency which can be measured in hertz. An infants ear is able to perceive frequencies ranging from 20 Hz to 20,000 Hz, the range of ultrasound, infrasound and other physical vibrations such as molecular and atomic vibrations extends from a few femtoHz into the terahertz range and beyond. Electromagnetic radiation is described by its frequency—the number of oscillations of the perpendicular electric and magnetic fields per second—expressed in hertz. Radio frequency radiation is measured in kilohertz, megahertz, or gigahertz
8.
HD Radio
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It was selected by the U. S. It is officially known as NRSC-5, with the latest version being NRSC-5-C, other digital radio systems include FMeXtra, Digital Audio Broadcasting, Digital Radio Mondiale, and Compatible AM-Digital. Although HD Radio broadcastings content is currently subscription-free, listeners must purchase new receivers in order to receive the portion of the signal. As of May 2009, there were stations in the world on the air with HD Radio technology than any other digital radio technology. More than 1,700 stations covering approximately 84% of the United States are broadcasting with this technology, according to iBiquitys website, the HD is simply a brand name and has no meaning. There is no connection with television, although like digital television the HD Radio specification provides enhanced capabilities over the analog format. Thus, there is no deadline by which consumers must buy an HD Radio receiver, in addition, there are many more analog AM/FM radio receivers than there were analog televisions, and many of these are car stereos or portable units that cannot be upgraded. Digital information is transmitted using OFDM with a compression algorithm called HDC. The cost of converting a radio station can run between $100,000 and $200,000, if the primary digital signal is lost the HD Radio receiver will revert to the analog signal, thereby providing seamless operation between the newer and older transmission methods. The extra HD-2 and HD-3 streams are not simulcast on analog, alternatively the HD Radio signal can revert to a more-robust 20 kilobit per second stream, though the sound is reduced to AM-like quality. Datacasting is also possible, with metadata providing song titles or artist information, by using spectral band replication the HDC+SBR codec is able to simulate the recreation of sounds up to 15,000 Hz, thus achieving moderate quality on the bandwidth-tight AM band. The HD Radio AM hybrid mode offers two options which can carry approximately 40 or 60 kbit/s of data, but most AM digital stations default to the more-robust 40 kbit/s mode which features redundancy. HD Radio also provides a digital mode, which lacks an analog signal for fallback. The pure digital mode transmissions will stay within the AM stations channel instead of spilling into the next to the station transmitting HD radio as the hybrid stations do. The AM version of HD Radio technology uses the 20 kHz channel, when operating in pure digital mode, the AM HD Radio signal fits inside a standard 20 kHz channel or an extended 30 kHz channel, at the discretion of the station manager. As AM radio stations are spaced at 9 kHz or 10 kHz intervals, some nighttime listeners have expressed concern this design harms reception of adjacent channels with one formal complaint filed regarding the matter, WYSL owner Bob Savage against WBZ in Boston. The HD Radio also provides several digital modes with up to 300 kbit/s bitrate. Like AM, pure digital FM provides a fallback condition where it reverts to a more robust 25 kbit/s signal, FM stations have the option to subdivide their datastream into sub-channels of varying audio quality
