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145-569: KBUE (105.5 FM , "Que Buena 105.5/94.3 FM") is a commercial radio station licensed to Long Beach, California , that serves the Los Angeles metropolitan area . It is owned by Estrella Media and airs a Regional Mexican radio format . Studios and offices are on Hollywood Boulevard in Los Angeles . KBUE's transmitter is located off East University Avenue in Compton, California . It has an effective radiated power of 3,000 watts , making it

290-705: A Class A station. (Most other major Los Angeles area stations have more powerful Class B signals with their towers high up on Mount Wilson .) To fill in gaps in KBUE's coverage area, "Que Buena" is also simulcasted on co-owned and co-channel 94.3 KBUA in San Fernando and KEBN in Garden Grove . KBUE'S RDS genre is Classical , while the station airs a Regional mexican music format. A Federal Communications Commission construction permit for 105.5 FM in Beverly Hills

435-511: A US Commission on Civil Rights of hearing that of 31,000 homes that had recently sprung up in this neighborhood, not a single one had been sold to an African-American. Phoenix's African-American and Mexican-American communities remained largely sequestered on the south side of town. The color lines were so rigid that no one north of Van Buren Street would rent to the African-American baseball star Willie Mays , in town for spring training in

580-643: A country music station), and KMXN. When it was acquired by Liberman Broadcasting, it switched to KEBN, another call sign representing the "Que Buena" format. (Today, KTBT is a CHR station in Tulsa, Oklahoma . The KIKF calls, incidentally, are now used by a country music station in Cascade, Montana .) On November 18, 1994, the two stations on 94.3 began simulcasting the same country music format and 94.3 in San Fernando became KYKF. This lasted until October 31, 1996, after

725-625: A hot desert climate ( Köppen: BWh ), typical of the Sonoran Desert , and is the largest city in America in this climatic zone. Phoenix has long, extremely hot summers and short, mild winters. The city is within one of the world's sunniest regions, with its sunshine duration comparable to the Sahara region. With 3,872 hours of bright sunshine annually, Phoenix receives the most sunshine of any major city on Earth. Average high temperatures in summer are

870-538: A "cool AC " format (somewhat of a precursor to the Jack FM format), and the call letters changed to KMXN on September 29. That call sign was likely being chosen because the format was similar to previous Orange County station KXMX known as "Mix 95.9" (now KFSH-FM ). Liberman acquired KMXN in 2003, and on January 7, started simulcasting the KBUE/KBUA signal, giving " Que Buena " coverage in nearly all of Orange County. On May 15,

1015-452: A duel; Chenowth killed Favorite and was forced to withdraw from the race. The town grew during the 1870s, and President Ulysses S. Grant issued a land patent for the site of Phoenix on April 10, 1874. By 1875, the town had a telegraph office, 16 saloons, and four dance halls, but the townsite-commissioner form of government needed an overhaul. An election was held in 1875, and three village trustees and other officials were elected. By 1880,

1160-458: A few. "La Que Buena" or "Aqui Suena La Que Buena", as it is commonly referred to, also plays the genre "banda" with primarily the "La Banda el Recodo" as its focus. Other artists who have airplay are El As de la Sierra, El Chapo, Valentín Elizalde, Jenni Rivera , Rogelio Martínez, El Potro de Sinaloa, El Coyote y su Banda, Los Tucanes, Los Rieleros, Los Incomparables, Los Tucanes, Los Razos, Los Originales de San Juan, and many others. There has been

1305-549: A four percent annual population growth rate over a 40-year period from the mid-1960s to the mid-2000s, and was among the nation's ten most populous cities by 1980. Phoenix is also one of the largest plurality-Hispanic cities in the United States, with 42% of its population being Hispanic . The Hohokam people occupied the Phoenix area for 2,000 years. They created roughly 135 miles (217 kilometers) of irrigation canals, making

1450-548: A fungal lung infection. Unlike most desert locations which have drastic fluctuations between day and nighttime temperatures, the urban heat island effect limits Phoenix's diurnal temperature variation . As the city has expanded, average summer low temperatures have been steadily rising. Pavement, sidewalks, and buildings store the Sun's heat and radiate it at night. The daily normal low remains at or above 80 °F (27 °C) for an average of 74 days per summer. On July 19, 2023, at

1595-500: A grid layout pattern that has been the hallmark of Phoenix's urban development ever since. On February 12, 1871, the territorial legislature created Maricopa County by dividing Yavapai County; it was the sixth one formed in the Arizona Territory. The first election for county office was held in 1871 when Tom Barnum was elected the first sheriff. He ran unopposed when the other two candidates (John A. Chenowth and Jim Favorite) fought

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1740-570: A growth rate under 24% in a census decade. However, in 2016, Phoenix once again became the fastest growing city in the United States, adding approximately 88 people per day during the preceding year. The Phoenix Metropolitan Statistical Area (MSA) (officially known as the Phoenix-Mesa-Chandler MSA ), is one of 10 MSAs in Arizona, and was the 11th largest in the United States, with a 2018 U.S. census population estimate of 4,857,962, up from

1885-466: A joint congressional resolution granting statehood to Arizona, due to his disapproval of the state constitution's position on the recall of judges. In 1913, Phoenix's move from a mayor-council system to council-manager made it one of the first cities in the United States with this form of city government. After statehood, Phoenix's growth started to accelerate; eight years later, its population reached 29,053. In 1920, Phoenix would see its first skyscraper,

2030-402: A long drought, and the reservoir which was supposed to be behind the dam was virtually dry. The humorist Will Rogers , who was on hand as a guest speaker joked, "If that was my lake, I'd mow it." Phoenix's population had nearly doubled during the 1920s and by 1930 stood at 48,118. It was also during the 1930s that Phoenix and its surrounding area began to be called "The Valley of the Sun", which

2175-510: A monophonic broadcast, again the most common permitted maximum deviation is ±75 kHz. However, some countries specify a lower value for monophonic broadcasts, such as ±50 kHz. The bandwidth of an FM transmission is given by the Carson bandwidth rule which is the sum of twice the maximum deviation and twice the maximum modulating frequency. For a transmission that includes RDS this would be 2 × 75 kHz + 2 × 60 kHz  = 270 kHz . This

2320-409: A myriad of residential tract developments on both farmland and desert." Retail outlets and office complexes spread out and did not concentrate in the small downtown area. There was low population density and a lack of widespread and significant high-rise development. As a consequence Phoenix became a textbook case of urban sprawl for geographers. Even though it is the fifth most populated city in

2465-686: A planning committee appointed directly by the city council. According to the city-issued village planning handbook, the purpose of the village planning committees is to "work with the city's planning commission to ensure a balance of housing and employment in each village, concentrate development at identified village cores, and to promote the unique character and identity of the villages." There are 15 urban villages: Ahwatukee Foothills , Alhambra , Camelback East , Central City , Deer Valley , Desert View, Encanto , Estrella , Laveen , Maryvale , North Gateway, North Mountain, Paradise Valley, Rio Vista , and South Mountain. The urban village of Paradise Valley

2610-426: A population of nearly 1.6 million, and millions more in nearby suburbs. After the war, many of the men who had undergone their training in Arizona returned with their new families. Learning of this large untapped labor pool enticed many large industries to move their operations to the area. In 1948, high-tech industry, which would become a staple of the state's economy, arrived in Phoenix when Motorola chose Phoenix as

2755-557: A program feed for AM transmitters of AM/FM stations. SCA subcarriers are typically 67 kHz and 92 kHz. Initially the users of SCA services were private analog audio channels which could be used internally or leased, for example Muzak -type services. There were experiments with quadraphonic sound. If a station does not broadcast in stereo, everything from 23 kHz on up can be used for other services. The guard band around 19 kHz (±4 kHz) must still be maintained, so as not to trigger stereo decoders on receivers. If there

2900-588: A recent boom within the "paisa" community with the beginning of "el movimiento alterado ". Artists that fit this criterion are Larry Hernandez, Roberto Tapia, Enigma Norteno, Gerardo Ortiz, Noel Torres, Aldredito Olivas, El Komander, and others. In addition to Mexican regional music, KBUE and its trimulcast partners have Spanish-language radio rights to the Los Angeles Chargers of the National Football League . FM broadcasting Throughout

3045-470: A studio-to-transmitter link system. In April 1935, the AM subcarriers were replaced by FM subcarriers, with much improved results. The first FM subcarrier transmissions emanating from Major Armstrong's experimental station KE2XCC at Alpine, New Jersey occurred in 1948. These transmissions consisted of two-channel audio programs, binaural audio programs and a fax program. The original subcarrier frequency used at KE2XCC

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3190-471: Is 7.22 in (183 mm). The region's trademark dry and sunny weather is interrupted by sporadic Pacific storms in the winter and the arrival of the North American monsoon in the summer. Historically, the monsoon officially started when the average dew point was 55 °F (13 °C) for three days in a row—typically occurring in early July. To increase monsoon awareness and promote safety, however,

3335-525: Is added. VHF radio waves usually do not travel far beyond the visual horizon , so reception distances for FM stations are typically limited to 30–40 miles (50–60 km). They can also be blocked by hills and to a lesser extent by buildings. Individuals with more-sensitive receivers or specialized antenna systems, or who are located in areas with more favorable topography, may be able to receive useful FM broadcast signals at considerably greater distances. The knife edge effect can permit reception where there

3480-616: Is also home to a plethora of native reptile species including the Western diamondback rattlesnake , Sonoran sidewinder , several other types of rattlesnakes, Sonoran coral snake , dozens of species of non-venomous snakes (including the Sonoran gopher snake and the California kingsnake ), the gila monster , desert spiny lizard , several types of whiptail lizards , the chuckwalla , desert horned lizard , western banded gecko , Sonora mud turtle , and

3625-422: Is also known as the necessary bandwidth . Random noise has a triangular spectral distribution in an FM system, with the effect that noise occurs predominantly at the higher audio frequencies within the baseband . 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 audio frequencies in

3770-408: Is amplitude modulated onto a 38 kHz double-sideband suppressed-carrier (DSB-SC) signal, thus occupying 23 kHz to 53 kHz. A 19 kHz ± 2 Hz pilot tone , at exactly half the 38 kHz sub-carrier frequency and with a precise phase relationship to it, as defined by the formula below, is also generated. The pilot is transmitted at 8–10% of overall modulation level and used by

3915-422: Is authorized for "hybrid" mode operation, wherein both the conventional analog FM carrier and digital sideband subcarriers are transmitted. The output power of an FM broadcasting transmitter is one of the parameters that governs how far a transmission will cover. The other important parameters are the height of the transmitting antenna and the antenna gain . Transmitter powers should be carefully chosen so that

4060-581: Is designed to be capable of use alongside ARI despite using identical subcarrier frequencies. In the United States and Canada , digital radio services are deployed within the FM band rather than using Eureka 147 or the Japanese standard ISDB . This in-band on-channel approach, as do all digital radio techniques, makes use of advanced compressed audio . The proprietary iBiquity system, branded as HD Radio ,

4205-418: Is distinct from the nearby Town of Paradise Valley . Although the urban village is part of Phoenix, the town is independent. In addition to the above urban villages, Phoenix has a variety of commonly referred-to regions and districts, such as Downtown , Midtown , Uptown, West Phoenix, North Phoenix , South Phoenix , Biltmore Area , Arcadia , and Sunnyslope . While some of the native flora and fauna of

4350-492: Is home to the only thriving feral population of rosy-faced lovebirds in the U.S. This bird is a popular birdcage pet, native to southwestern Africa. Feral birds were first observed living outdoors in 1987, probably escaped or released pets, and by 2010 the Greater Phoenix population had grown to about 950 birds. These lovebirds prefer older neighborhoods where they nest under untrimmed, dead palm tree fronds. The area

4495-558: Is in the mid-to-low 30s. It rarely drops to 32 °F (0 °C) or below. Snow is rare. In July 2023, it became the first major city in the US to have an average monthly temperature of over 100 °F (38 °C) with an average daily mean temperature for the month at 102.7 °F (39 °C), which is also the hottest month ever recorded in the city. That same month the city had an unprecedented streak of 31 days with 110 °F (43 °C)+ highs that lasted from June 30 to July 30. That year

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4640-527: Is in the south-central portion of Arizona; about halfway between Tucson to the southeast and Flagstaff to the north, in the Southwestern United States . By car, the city is approximately 150 miles (240 kilometers) north of the US–Mexico border at Sonoyta and 180 mi (290 km) north of the border at Nogales . The metropolitan area is known as the "Valley of the Sun" due to its location in

4785-480: Is mainly the preserve of talk radio, news, sports, religious programming, ethnic (minority language) broadcasting and some types of minority interest music. This shift has transformed AM into the "alternative band" that FM once was. (Some AM stations have begun to simulcast on, or switch to, FM signals to attract younger listeners and aid reception problems in buildings, during thunderstorms, and near high-voltage wires. Some of these stations now emphasize their presence on

4930-671: Is no direct line of sight between broadcaster and receiver. The reception can vary considerably depending on the position. One example is the Učka mountain range, which makes constant reception of Italian signals from Veneto and Marche possible in a good portion of Rijeka , Croatia, despite the distance being over 200 km (125 miles). Other radio propagation effects such as tropospheric ducting and Sporadic E can occasionally allow distant stations to be intermittently received over very large distances (hundreds of miles), but cannot be relied on for commercial broadcast purposes. Good reception across

5075-487: Is only suitable for text. A few proprietary systems are used for private communications. A variant of RDS is the North American RBDS or "smart radio" system. In Germany the analog ARI system was used prior to RDS to alert motorists that traffic announcements were broadcast (without disturbing other listeners). Plans to use ARI for other European countries led to the development of RDS as a more powerful system. RDS

5220-412: Is open to anyone who does not carry a prohibition and can put up the appropriate licensing and royalty fees. In 2010 around 450 such licences were issued. Phoenix, Arizona Phoenix ( / ˈ f iː n ɪ k s / FEE -niks ) is the capital and most populous city of the U.S. state of Arizona , with 1,662,607 residents as of 2024. It is the fifth-most populous city in

5365-504: Is performed by a decoder, built into stereo receivers. Again, the decoder can use a switching technique to recover the left and right channels. In addition, for a given RF level at the receiver, the signal-to-noise ratio and multipath distortion for the stereo signal will be worse than for the mono receiver. For this reason many stereo FM receivers include a stereo/mono switch to allow listening in mono when reception conditions are less than ideal, and most car radios are arranged to reduce

5510-554: Is related to the transmitter 's RF power, the antenna gain , and antenna height . Interference from other stations is also a factor in some places. In the U.S, the FCC publishes curves that aid in calculation of this maximum distance as a function of signal strength at the receiving location. Computer modelling is more commonly used for this around the world. Many FM stations, especially those located in severe multipath areas, use extra audio compression /processing to keep essential sound above

5655-588: Is so common, nearly all homes in Phoenix have air conditioning , though poorer residents may not be able to afford to repair or operate them when needed. Maricopa County, which includes Phoenix, was ranked seventh for most ozone pollution in the United States according to the American Lung Association . Vehicle emissions are cited as precursors to ozone formation. Phoenix also has high levels of particulate pollution; although, cities in California lead

5800-626: Is stereo, there will typically be a guard band between the upper limit of the DSBSC stereo signal (53 kHz) and the lower limit of any other subcarrier. Digital data services are also available. A 57 kHz subcarrier ( phase locked to the third harmonic of the stereo pilot tone) is used to carry a low-bandwidth digital Radio Data System signal, providing extra features such as station name, alternative frequency (AF), traffic data for satellite navigation systems and radio text (RT). This narrowband signal runs at only 1,187.5 bits per second , thus

5945-462: Is the presence of Africanized bees which can be extremely dangerous—even lethal—when provoked. The Arizona Upland subdivision of the Sonoran Desert (of which Phoenix is a part) has "the most structurally diverse flora in the United States." One of the most well-known types of succulents, the giant saguaro cactus , is found throughout the city and its neighboring environs. Other native species are

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6090-427: Is used. This applies to both mono and stereo transmissions. For stereo, pre-emphasis is applied to the left and right channels before multiplexing . The use of pre-emphasis becomes a problem because many forms of contemporary music contain more high-frequency energy than the musical styles which prevailed at the birth of FM broadcasting. Pre-emphasizing these high-frequency sounds would cause excessive deviation of

6235-752: The Arizona Veterans Memorial Coliseum opened at the Arizona State Fairgrounds , west of downtown. When Phoenix was awarded an NBA franchise in 1968, which would be called the Phoenix Suns , they played their home games at the Coliseum until 1992, after which they moved to America West Arena . In 1968, President Lyndon B. Johnson approved the Central Arizona Project , assuring future water supplies for Phoenix, Tucson, and

6380-511: The Carnegie Free Library opened seven years later, on February 18, 1908, dedicated by Benjamin Fowler. The National Reclamation Act was signed by President Theodore Roosevelt in 1902, which allowed dams to be built on waterways in the west for reclamation purposes. The first dam constructed under the act, Salt River Dam#1 , began in 1903. It supplied both water and electricity, becoming

6525-775: The First National Bank Plaza , the Valley Center (the tallest building in Arizona), and the Arizona Bank building . On September 25, 1981, Phoenix resident Sandra Day O'Connor broke the gender barrier on the U.S. Supreme Court , when she was sworn in as the first female justice. In 1985, the Palo Verde Nuclear Generating Station , the nation's largest nuclear power plant, began electrical production. Pope John Paul II and Mother Teresa both visited

6670-638: The Heard Building ; it was the tallest building in the state until the completion of the Luhrs Building in 1924. In 1929, Sky Harbor was officially opened, at the time owned by Scenic Airways . The city purchased it in 1935 and continues to operate it today. On March 4, 1930, former U.S. President Calvin Coolidge dedicated a dam on the Gila River named in his honor. However, the state had just been through

6815-580: The Light Programme , Third Programme and Home Service . These three networks used the sub-band 88.0–94.6 MHz. The sub-band 94.6–97.6 MHz was later used for BBC and local commercial services. However, only when commercial broadcasting was introduced to the UK in 1973 did the use of FM pick up in Britain. With the gradual clearance of other users (notably Public Services such as police, fire and ambulance) and

6960-454: The Santa Fe, Prescott and Phoenix Railway in 1895 connected Phoenix to Prescott, Flagstaff, and other communities in the northern part of the territory. The increased access to commerce expedited the city's economic rise. The Phoenix Union High School was established in 1895 with an enrollment of 90. On February 25, 1901, Governor Oakes Murphy dedicated the permanent Capitol building , and

7105-500: The Sonoran Desert can be found within Phoenix city limits, most are found in the suburbs and the undeveloped desert areas that surround the city. Native mammal species include coyote , javelina , bobcat , mountain lion , desert cottontail rabbit , jackrabbit , antelope ground squirrel , mule deer , ringtail , coati , and multiple species of bats, such as the Mexican free-tailed bat and western pipistrelle , that roost in and around

7250-457: The Southwestern United States . Phoenix, the seat of Maricopa County , is the largest city by population and area in Arizona, with an area of 517.9 square miles (1,341 km ), and is also the 11th-largest city by area in the United States. Phoenix was settled in 1867 as an agricultural community near the confluence of the Salt and Gila Rivers and was incorporated as a city in 1881. It became

7395-612: The White Tank Mountains to the west, the Superstition Mountains far to the east, and both South Mountain and the Sierra Estrella to the south/southwest. Camelback Mountain , North Mountain, Sunnyslope Mountain , and Piestewa Peak are within the heart of the valley. The city's outskirts have large fields of irrigated cropland and Native American reservation lands. The Salt River runs westward through Phoenix, but

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7540-543: The desert tortoise . Native amphibian species include the Couch's spadefoot toad , Chiricahua leopard frog , and the Sonoran desert toad . Phoenix and the surrounding areas are also home to a wide variety of native invertebrates including the Arizona bark scorpion , giant desert hairy scorpion , Arizona blond tarantula , Sonoran Desert centipede , tarantula hawk wasp , camel spider , and tailless whip scorpion . Of great concern

7685-669: The organpipe , barrel , fishhook , senita , prickly pear and cholla cacti; ocotillo ; Palo Verde trees and foothill and blue paloverde ; California fan palm ; agaves ; soaptree yucca , Spanish bayonet , desert spoon , and red yucca ; ironwood ; mesquite ; and the creosote bush . Many non-native plants also thrive in Phoenix including, but not limited to, the date palm , Mexican fan palm , pineapple palm , Afghan pine , Canary Island pine , Mexican fencepost cactus , cardon cactus , acacia , eucalyptus , aloe , bougainvillea , oleander , lantana , bottlebrush , olive , citrus , and red bird of paradise . Phoenix has

7830-577: The 1960s, most FM stations simply simulcast their co-owned AM stations, or played easy listening or classical music , often using broadcast automation . Harriscope sold KLFM in 1966 to the McCray Broadcasting Company, headed by W. Mike McCray, Carl C. Loucks, and Robert Switzer. McCray changed the call sign to KNAC and instituted a full-time Middle of the Road (MOR) format, but the station went silent from March through August 1967. That year,

7975-602: The 1960s, with tourism becoming the third largest industry by the end of the decade. In 1965, the Phoenix Corporate Center opened; at the time it was the tallest building in Arizona, topping off at 341 feet. The 1960s saw many other buildings constructed as the city expanded rapidly, including the Rosenzweig Center (1964), today called Phoenix City Square , the landmark Phoenix Financial Center (1964), as well as many of Phoenix's residential high-rises. In 1965

8120-432: The 1960s. In 1964, a reporter from The New Republic wrote of segregation in these terms: "Apartheid is complete. The two cities look at each other across a golf course." The continued rapid population growth led more businesses to the valley to take advantage of the labor pool, and manufacturing, particularly in the electronics sector, continued to grow. The convention and tourism industries saw rapid expansion during

8265-492: The 1970s and 1980s: A commercially unsuccessful noise reduction system used with FM radio in some countries during the late 1970s, Dolby FM was similar to Dolby B but used a modified 25 μs pre-emphasis time constant and a frequency selective companding arrangement to reduce noise. The pre-emphasis change compensates for the excess treble response that otherwise would make listening difficult for those without Dolby decoders. A similar system named High Com FM

8410-514: The 1970s. The station stayed with progressive rock until 1980 when it made a significant adjustment in its rock format. In 1980, the station adopted one of the first full-time commercial alternative rock formats in the country. Up to that point, Pasadena -based KROQ-FM and stations in Phoenix , Seattle , and New York City had attempted such formats. KROQ notwithstanding, most commercial attempts at alternative rock were short-lived. KNAC began using

8555-421: The 2000 census (a total of 124,000 people), while the entire Phoenix metropolitan area grew by 28.9% during the same period. This compares with an overall growth rate nationally during the same time frame of 9.7%. Not since 1940–50, when the city had a population of 107,000, had the city gained less than 124,000 in a decade. Phoenix's recent growth rate of 9.4% from the 2010 census is the first time it has recorded

8700-537: The 2010 census population of 4,192,887. Consisting of both Pinal and Maricopa counties, the MSA accounts for 65.5% of Arizona's population. Phoenix only contributed 13% to the total growth rate of the MSA, down significantly from its 33% share during the prior decade. Phoenix is also part of the Arizona Sun Corridor megaregion (MR), which is the tenth most populous of the 11 MRs, and the eighth largest by area. It had

8845-638: The FCC announced the reassignment of the FM band to 90 channels from 88–106 MHz (which was soon expanded to 100 channels from 88–108 MHz). This shift, which the AM-broadcaster RCA had pushed for, made all the Armstrong-era FM receivers useless and delayed the expansion of FM. In 1961 WEFM (in the Chicago area) and WGFM (in Schenectady, New York ) were reported as the first stereo stations. By

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8990-699: The FCC rules do not allow this mode of stereo operation. In 1969, Louis Dorren invented the Quadraplex system of single station, discrete, compatible four-channel FM broadcasting. There are two additional subcarriers in the Quadraplex system, supplementing the single one used in standard stereo FM. The baseband layout is as follows: The normal stereo signal can be considered as switching between left and right channels at 38 kHz, appropriately band-limited. The quadraphonic signal can be considered as cycling through LF, LR, RF, RR, at 76 kHz. Early efforts to transmit discrete four-channel quadraphonic music required

9135-511: The FCC. The original Dorren Quadraplex System outperformed all the others and was chosen as the national standard for Quadraphonic FM broadcasting in the United States. The first commercial FM station to broadcast quadraphonic program content was WIQB (now called WWWW-FM ) in Ann Arbor / Saline, Michigan under the guidance of Chief Engineer Brian Jeffrey Brown. Various attempts to add analog noise reduction to FM broadcasting were carried out in

9280-451: The FM carrier . Modulation control (limiter) devices are used to prevent this. 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. Pre-emphasis and de-emphasis was used in the earliest days of FM broadcasting. According to a BBC report from 1946, 100 μs was originally considered in

9425-511: The FM band.) The medium wave band (known as the AM band because most stations using it employ amplitude modulation) was overcrowded in western Europe, leading to interference problems and, as a result, many MW frequencies are suitable only for speech broadcasting. Belgium , the Netherlands , Denmark and particularly Germany were among the first countries to adopt FM on a widespread scale. Among

9570-969: The FM radio band from 87.5-108.0 MHz to 76.1-108.0 MHz to enable the migration of AM radio stations in Brazilian capitals and large cities. FM broadcasting began in the late 1930s, when it was initiated by a handful of early pioneer experimental stations, including W1XOJ/W43B/WGTR (shut down in 1953) and W1XTG/ WSRS , both transmitting from Paxton, Massachusetts (now listed as Worcester, Massachusetts ); W1XSL/W1XPW/W65H/WDRC-FM/WFMQ/WHCN , Meriden, Connecticut; and W2XMN , KE2XCC , and WFMN , Alpine, New Jersey (owned by Edwin Armstrong himself, closed down upon Armstrong's death in 1954). Also of note were General Electric stations W2XDA Schenectady and W2XOY New Scotland, New York—two experimental FM transmitters on 48.5 MHz—which signed on in 1939. The two began regular programming, as W2XOY, on November 20, 1940. Over

9715-675: The Gila River Valley, from Florence in the east to the Estrellas in the west. Their crops included corn, beans, and squash for food as well as cotton and tobacco. They banded with the Maricopa for protection against incursions by the Yuma and Apache tribes. The Maricopa are part of the larger Yuma people; however, they migrated east from the lower Colorado and Gila Rivers in the early 1800s, when they began to be enemies with other Yuma tribes, settling among

9860-567: The Hohokam. Other nearby settlements later merged to become the city of Tempe . The history of Phoenix begins with Jack Swilling , a Confederate veteran of the Civil War who prospected in the nearby mining town of Wickenburg in the newly formed Arizona Territory . As he traveled through the Salt River Valley in 1867, he saw a potential for farming to supply Wickenburg with food. He also noted

10005-754: The International Cities Broadcasting Corporation bought KNAC and increased its power to 2,100 watts. Additionally, KNAC relocated to the International Tower in downtown Long Beach. In late 1967, the station began programming progressive rock from 6 p.m. to 6 a.m. The programming proved successful enough to make the rock format full time by 1969 when Harden Broadcasting bought KNAC. Air talent at KNAC during this era included Jim Ladd (later of KLOS ), Jerry Longden (later of KROQ), and Program Director Ron McCoy. Ladd left KNAC to work for KLOS in 1971 while McCoy stayed on through much of

10150-743: The KWIE call letters to 93.5 in Ontario , as a simulcast of KDAY .) Other than the morning show, programming on KRQB is separate from that of the other Que Buena stations. Currently, Que Buena primarily targets the "Mexican American" or "paisa" community of the greater Los Angeles area. "Paisa" is a slang term in Spanish, meaning those who are culturally Mexican or "paisanos", and thus listen to such legendary Mexican artists such as Chalino Sánchez and Saul Viera. Other artists who gained quick popularity because of KBUE were El Narquillo, Adán Sánchez, and Lupillo Rivera , to name

10295-414: The L+R signal so the listener will hear both channels through the single loudspeaker. A stereo receiver will add the difference signal to the sum signal to recover the left channel, and subtract the difference signal from the sum to recover the right channel. The (L+R) signal is limited to 30 Hz to 15 kHz to protect a 19 kHz pilot signal. The (L−R) signal, which is also limited to 15 kHz,

10440-487: The National Weather Service decreed that starting in 2008, June 15 would be the official "first day" of the monsoon, and it would end on September 30. When active, the monsoon raises humidity levels and can cause heavy localized precipitation, flash floods, hail, destructive winds, and dust storms —which can rise to the level of a haboob in some years. As of 2020, Phoenix was the fifth most populous city in

10585-575: The Phoenix Concept 2000 plan which split the city into urban villages, each with its own village core where greater height and density was permitted, further shaping the free-market development culture. The nine original villages have expanded to 15 over the years (see Cityscape below). This officially turned Phoenix into a city of many nodes, which would later be connected by freeways. The Phoenix Symphony Hall opened in 1972; other major structures which saw construction downtown during this decade were

10730-461: The Salt River Valley. It lies at a mean elevation of 1,086 feet (331 m), in the northern reaches of the Sonoran Desert . Other than the mountains in and around the city, Phoenix's topography is generally flat, which allows the city's main streets to run on a precise grid with wide, open-spaced roadways. Scattered, low mountain ranges surround the valley: McDowell Mountains to the northeast,

10875-826: The San Fernando station was sold to Liberman and started simulcasting KBUE. On January 31, 1997, it acquired the KBUA call letters. " Que Buena " now reached most of metropolitan Los Angeles County, though reception remains difficult in some regions, such as the San Gabriel Valley and Malibu . A booster station , KBUA-FM1 in Santa Clarita, California , extends the signal's reach into the Santa Clarita Valley . On June 25, 2000, 94.3 in Garden Grove became "Cool 94.3" in Anaheim, with

11020-629: The US, but 75 μs subsequently adopted. 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, at his experimental 41 MHz station W2XDG located on the 85th floor of the Empire State Building in New York City . These FM multiplex transmissions started in November 1934 and consisted of

11165-463: The United States and the most populous state capital in the country. Phoenix is the most populous city of the Phoenix metropolitan area , also known as the Valley of the Sun, which in turn is part of the Salt River Valley and Arizona Sun Corridor . The metro area is the 10th-largest by population in the United States with approximately 4.95 million people as of 2020 , making it the most populous in

11310-469: The United States , with the census bureau placing its population at 1,608,139, edging out Philadelphia with a population of 1,567,872. In the aftermath of the Great Recession, Phoenix had a population of 1,445,632 according to the 2010 United States census , the sixth largest city and still the most populous state capital in the United States. Prior to the Great Recession, in 2006, Phoenix's population

11455-436: The United States, the large area gives it a low density rate of approximately 2,797 people per square mile. In comparison, Philadelphia , the sixth most populous city with nearly the same population as Phoenix, has a density of over 11,000 people per square mile. Like most of Arizona, Phoenix does not observe daylight saving time . In 1973, Governor Jack Williams argued to the U.S. Congress that energy use would increase in

11600-512: The Valley in 1987. There was an influx of refugees due to low-cost housing in the Sunnyslope area in the 1990s, resulting in 43 different languages being spoken in local schools by 2000. The new 20-story City Hall opened in 1992. Phoenix has maintained a growth streak in recent years, growing by 24.2% before 2007. This made it the second-fastest-growing metropolitan area in the United States, surpassed only by Las Vegas . In 2008, Squaw Peak,

11745-516: The agricultural corridor between them. The following year, Pope Paul VI created the Diocese of Phoenix on December 2, by splitting the Archdiocese of Tucson, with Edward A. McCarthy as the first Bishop. In the 1970s the downtown area experienced a resurgence, with a level of construction activity not seen again until the urban real estate boom of the 2000s. By the end of the decade, Phoenix adopted

11890-570: The air. It was owned by the Harriscope Music Corporation, with Bert Harris serving as president and general manager. The station was initially powered at only 330 watts, keeping its signal restricted to Long Beach and adjacent communities. KLFM's studios were initially located in a trailer adjacent to its transmitter on Signal Hill , moving to Lakewood Center and then to 4406 Greenmeadow Road. KLFM played Top 40 hits in an era where most young people used AM radios to hear their music. In

12035-571: The area. After the departure of the Hohokam, groups of Akimel O'odham (commonly known as Pima), Tohono O'odham , and Maricopa tribes began to use the area, as well as segments of the Yavapai and Apache. The O'odham were offshoots of the Sobaipuri tribe, who in turn were thought to be the descendants of the Hohokam. The Akimel O'odham were the major group in the area. They lived in small villages with well-defined irrigation systems that spread over

12180-454: The assigned frequency. There are other unusual and obsolete FM broadcasting standards in some countries, with non-standard spacings of 1, 10, 30, 74, 500, and 300 kHz. To minimise inter-channel interference, stations operating from the same or nearby transmitter sites tend to keep to at least a 500 kHz frequency separation even when closer frequency spacing is technically permitted. The ITU publishes Protection Ratio graphs, which give

12325-511: The background noise for listeners, often at the expense of overall perceived sound quality. In such instances, however, this technique is often surprisingly effective in increasing the station's useful range. The first radio station to broadcast in FM in Brazil was Rádio Imprensa, which began broadcasting in Rio de Janeiro in 1955, on the 102.1 MHz frequency, founded by businesswoman Anna Khoury. Due to

12470-564: The call letters became KEBN. (The KMXN calls now reside on a country music station in Osage City, Kansas .) On August 1, 2007, Liberman added another "Que Buena" outlet to the lineup, with the acquisition of Rhythmic Contemporary 96.1 KWIE, licensed to San Jacinto, California , from Magic Broadcasting. The call sign was immediately changed to KRQB. The addition of the new station extended Liberman's "Que Buena" brand into Riverside and San Bernardino counties . (The previous owners transferred

12615-401: The capital of Arizona Territory in 1889. Its canal system led to a thriving farming community with the original settlers' crops, such as alfalfa , cotton , citrus , and hay , remaining important parts of the local economy for decades. Cotton, cattle , citrus, climate , and copper were known locally as the "Five C's" anchoring Phoenix's economy. These remained the driving forces of

12760-402: The carrier, with its frequency remaining constant. With FM, frequency deviation from the assigned carrier frequency at any instant is directly proportional to the amplitude of the (audio) input signal, determining the instantaneous frequency of the transmitted signal. Because transmitted FM signals use significantly more bandwidth than AM signals, this form of modulation is commonly used with

12905-599: The city also had a record 55 days of daily highs topping 110 °F (43 °C)+, which also made summer of 2023 the hottest on record there, until it was beaten by the summer of 2024 with the hottest ever June at 97.0 °F (36 °C), the third hottest august August at 98.7 °F (37 °C) and the 2nd hottest July record at 101.1 °F (38 °C) by average daily temperature respectively. That same year in 2024, it also recorded an unprecedented 113 day streak of daily highs topping 100 °F (38 °C)+ that lasted from May 27 to September 16. Because extreme heat

13050-400: The city until after World War II , when high-tech companies began to move into the valley and air conditioning made Phoenix's hot summers more bearable. Phoenix is the cultural center of Arizona. It is in the northeastern reaches of the Sonoran Desert and is known for its hot desert climate . The region's gross domestic product reached over $ 362 billion by 2022. The city averaged

13195-416: The city's second tallest mountain, was renamed Piestewa Peak after Army Specialist Lori Ann Piestewa , an Arizonan and the first Native American woman to die in combat while serving in the U.S. military, as well as being the first American female casualty of the 2003 Iraq War . 2008 also saw Phoenix as one of the cities hardest hit by the subprime mortgage crisis , and by early 2009 the median home price

13340-444: The city. There are many species of native birds, including Costa's hummingbird , Anna's hummingbird , Gambel's quail , Gila woodpecker , mourning dove , white-winged dove , the greater roadrunner , the cactus wren , and many species of raptors, including falcons , hawks , owls , vultures (such as the turkey vulture and black vulture ), and eagles , including the golden and the bald eagle . The greater Phoenix region

13485-431: The country is one of the main advantages over DAB/+ radio . This is still less than the range of AM radio waves, which because of their lower frequencies can travel as ground waves or reflect off the ionosphere , so AM radio stations can be received at hundreds (sometimes thousands) of miles. This is a property of the carrier wave's typical frequency (and power), not its mode of modulation. The range of FM transmission

13630-721: The coverage of the Que Buena format. The station at 94.3 FM in San Fernando first signed on the air as KVFM in 1958, but for a long time it was KGIL-FM, a radio station playing adult standards , along with sister station to KGIL AM 1260 . On August 5, 1989, it became KMGX, "Magic 94.3". ( KMGX is now a classic rock station in Bend, Oregon . The KGIL-FM callsign is now attached to a country music station in Johannesburg, California .) The station at 94.3 FM in Garden Grove signed on in 1961 as KGGK, later to become KTBT, KORJ , KIKF ("KIK-FM",

13775-559: The desert land arable, and paths of these canals were used for the Arizona Canal , Central Arizona Project Canal, and the Hayden-Rhodes Aqueduct . They also carried out extensive trade with the nearby Ancient Puebloans , Mogollon , and Sinagua , as well as with the more distant Mesoamerican civilizations. It is believed periods of drought and severe floods between 1300 and 1450 led to the Hohokam civilization's abandonment of

13920-500: The eroded mounds of dirt that indicated previous canals dug by native peoples who had long since left the area. He formed the Swilling Irrigation and Canal Company that year, dug a large canal that drew in river water, and erected several crop fields in a location that is now within the eastern portion of central Phoenix near its airport. Other settlers soon began to arrive, appreciating the area's fertile soil and lack of frost, and

14065-476: The evening should Arizona observe DST. He went on to say energy use would also rise early in the day "because there would be more lights on in the early morning." Additionally, he said daylight saving time would cause children to go to school in the dark. Since 1979, the city of Phoenix has been divided into urban villages , many of which are based upon historically significant neighborhoods and communities that have since been annexed into Phoenix. Each village has

14210-630: The existing communities of the Akimel O'odham. The Tohono O'odham also lived in the region, but largely to the south and all the way to the Mexican border. The O'odham lived in small settlements as seasonal farmers who took advantage of the rains, rather than the large-scale irrigation of the Akimel. They grew crops such as sweet corn, tapery beans, squash, lentils, sugar cane, and melons, as well as taking advantage of native plants such as saguaro fruits, cholla buds, mesquite tree beans, and mesquite candy (sap from

14355-553: The extension of the FM band to 108.0 MHz between 1980 and 1995, FM expanded rapidly throughout the British Isles and effectively took over from LW and MW as the delivery platform of choice for fixed and portable domestic and vehicle-based receivers. In addition, Ofcom (previously the Radio Authority) in the UK issues on demand Restricted Service Licences on FM and also on AM (MW) for short-term local-coverage broadcasting which

14500-402: The extreme heat experienced in Phoenix and the surrounding areas during its long summers. There was more new construction in Phoenix in 1959 alone than from 1914 to 1946. Like many emerging American cities at the time, Phoenix's spectacular growth did not occur evenly. It largely took place on the city's north side, a region that was nearly all Caucasian. In 1962, one local activist testified at

14645-516: The farmhouse Swilling constructed became a frequently-visited location in the valley. Lord Darrell Duppa was one of the original settlers in Swilling's party, and he suggested the name "Phoenix", as it described a city born from the ruins of a former civilization. The Board of Supervisors in Yavapai County officially recognized the new town on May 4, 1868, and the first post office was established

14790-551: The first multi-purpose dam, and Roosevelt attended the official dedication on May 18, 1911. At the time, it was the largest masonry dam in the world, forming a lake in the mountains east of Phoenix. The dam would be renamed after Teddy Roosevelt in 1917, and the lake would follow suit in 1959. On February 14, 1912, Phoenix became a state capital, as Arizona was admitted to the Union as the 48th state under President William Howard Taft . This occurred just six months after Taft had vetoed

14935-655: The first of its kind on a commercial station in the United States. Several air staff members of the heavy metal station eventually went on to the original satellite-distributed, nationally syndicated " Z Rock " format in September 1986. KNAC played a wide variety of heavy metal and rock-based music from the late-1960s to 1995, the radio station's last year on the air, including classic rock , hard rock , traditional heavy metal , progressive rock / metal , power metal , glam metal , thrash metal , crossover thrash , death metal , groove metal , alternative metal , and grunge . KNAC

15080-453: The following month with Swilling as the postmaster. In October 1870, valley residents met to select a new townsite for the valley's growing population. A new location three miles to the west of the original settlement, containing several allotments of farmland, was chosen, and lots began to officially be sold under the name of Phoenix in December of that year. This established the downtown core in

15225-424: The height of an unprecedent heatwave that caused daily highs to top 110 °F (43 °C) or higher that lasted for 31 days straight, Phoenix set its record for the warmest daily low temperature, at 97 °F (36 °C). The city averages approximately 300 days of sunshine, or over 85% of daylight hours, per year, and receives scant rainfall―the average annual total at Phoenix Sky Harbor International Airport

15370-505: The high import costs of FM radio receivers, transmissions were carried out in circuit closed to businesses and stores, which played ambient music offered by radio. Until 1976, Rádio Imprensa was the only station operating in FM in Brazil. From the second half of the 1970s onwards, FM radio stations began to become popular in Brazil, causing AM radio to gradually lose popularity. In 2021, the Brazilian Ministry of Communications expanded

15515-467: The higher ( VHF or UHF ) frequencies used by TV , the FM broadcast band , and land mobile radio systems . The maximum frequency deviation of the carrier is usually specified and regulated by the licensing authorities in each country. For a stereo broadcast, the maximum permitted carrier deviation is invariably ±75 kHz, although a little higher is permitted in the United States when SCA systems are used. For

15660-421: The hottest of any major city in the United States. On average, there are 111 days annually with a high of at least 100 °F (38 °C), including most days from the end of May through late September. Highs top 110 °F (43 °C) an average of 21 days during the year. On June 26, 1990, the temperature reached an all-time recorded high of 122 °F (50 °C). The annual minimum temperature in Phoenix

15805-496: The import of vehicles, principally from the United States, with radios that can only tune to these frequencies. In some parts of Europe , Greenland , and Africa , only even multiples are used. In the United Kingdom , both odd and even are used. In Italy , multiples of 50 kHz are used. In most countries the maximum permitted frequency error of the unmodulated carrier is specified, which typically should be within 2 kHz of

15950-503: The last time. Three weeks later, on March 6th, the Spanish format launched with " Guadalajara " by Mariachi Sol de México being the first song played. The station would switch to the KBUE calls the same day. The format was " Ranchera -Mexican style" according to program director Fidel Fausto. The new call letters and format did not change the fact that KBUE's signal only covered southern Los Angeles County and northwestern Orange County . Liberman would buy additional radio stations to increase

16095-517: The late 1960s, FM had been adopted for broadcast of stereo "A.O.R.—' Album Oriented Rock ' Format", but it was not until 1978 that listenership to FM stations exceeded that of AM stations in North America. In most of the 70s FM was seen as highbrow radio associated with educational programming and classical music, which changed during the 1980s and 1990s when Top 40 music stations and later even country music stations largely abandoned AM for FM. Today AM

16240-516: The main channel audio program and three subcarriers : a fax program, a synchronizing signal for the fax program and a telegraph order channel. These original FM multiplex subcarriers were amplitude modulated. Two musical programs, consisting of both the Red and Blue Network program feeds of the NBC Radio Network, were simultaneously transmitted using the same system of subcarrier modulation as part of

16385-564: The main channel signal-to-noise ratio. The GE and Zenith systems, so similar that they were considered theoretically identical, were formally approved by the FCC in April 1961 as the standard stereo FM broadcasting method in the United States and later adopted by most other countries. It is important that stereo broadcasts be compatible with mono receivers. For this reason, the left (L) and right (R) channels are algebraically encoded into sum (L+R) and difference (L−R) signals. A mono receiver will use just

16530-519: The mesquite tree). They also hunted local game such as deer, rabbit, and javelina for meat. The Mexican–American War ended in 1848, Mexico ceded its northern zone to the United States, and the region's residents became U.S. citizens. The Phoenix area became part of the New Mexico Territory . In 1863, the mining town of Wickenburg was the first to be established in Maricopa County, to

16675-405: The minimum spacing between frequencies based on their relative strengths. Only broadcast stations with large enough geographic separations between their coverage areas can operate on the same or close frequencies. Frequency modulation or FM is a form of modulation which conveys information by varying the frequency of a carrier wave ; the older amplitude modulation or AM varies the amplitude of

16820-417: The nation in this hazard. PM2.5 particulate matter, which is a component of diesel engine exhaust, and larger PM10 particles, which can come from dust, can both reach concerning levels in Phoenix. In fact, people, pets, and other animals exposed to high concentrations of PM10 dust particles―primarily from dust storms or from disturbed agricultural or construction sites―are at risk of contracting Valley Fever ,

16965-536: The next few years this station operated under the call signs W57A, W87A and WGFM, and moved to 99.5 MHz when the FM band was relocated to the 88–108 MHz portion of the radio spectrum. General Electric sold the station in the 1980s. Today this station is WRVE . Other pioneers included W2XQR/W59NY/WQXQ/WQXR-FM , New York; W47NV/WSM-FM Nashville, Tennessee (signed off in 1951); W1XER/W39B/WMNE , with studios in Boston and later Portland, Maine, but whose transmitter

17110-573: The northwest of Phoenix. Maricopa County had not been incorporated; the land was within Yavapai County , which included the major town of Prescott to the north of Wickenburg. The Army created Fort McDowell on the Verde River in 1865 to forestall Indian uprisings. The fort established a camp on the south side of the Salt River by 1866, which was the first settlement in the valley after the decline of

17255-433: The originating station. The Crosby system was rejected by the FCC because it was incompatible with existing subsidiary communications authorization (SCA) services which used various subcarrier frequencies including 41 and 67 kHz. Many revenue-starved FM stations used SCAs for "storecasting" and other non-broadcast purposes. The Halstead system was rejected due to lack of high frequency stereo separation and reduction in

17400-551: The reasons for this were: Public service broadcasters in Ireland and Australia were far slower at adopting FM radio than those in either North America or continental Europe . Hans Idzerda operated a broadcasting station, PCGG , at The Hague from 1919 to 1924, which employed narrow-band FM transmissions. In the United Kingdom the BBC conducted tests during the 1940s, then began FM broadcasting in 1955, with three national networks:

17545-451: The receiver also reduces the high-frequency noise. These processes of boosting and then reducing certain frequencies are known as pre-emphasis and de-emphasis , respectively. 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

17690-515: The receiver to identify a stereo transmission and to regenerate the 38 kHz sub-carrier with the correct phase. The composite stereo multiplex signal contains the Main Channel (L+R), the pilot tone, and the (L−R) difference signal. This composite signal, along with any other sub-carriers, modulates the FM transmitter. The terms composite , multiplex and even MPX are used interchangeably to describe this signal. The instantaneous deviation of

17835-570: The required area is covered without causing interference to other stations further away. Practical transmitter powers range from a few milliwatts to 80 kW. As transmitter powers increase above a few kilowatts, the operating costs become high and only viable for large stations. The efficiency of larger transmitters is now better than 70% (AC power in to RF power out) for FM-only transmission. This compares to 50% before high efficiency switch-mode power supplies and LDMOS amplifiers were used. Efficiency drops dramatically if any digital HD Radio service

17980-400: The resulting signal is that it alternates between left and right at 38 kHz, with the phase determined by the 19 kHz pilot signal. Most stereo encoders use this switching technique to generate the 38 kHz subcarrier, but practical encoder designs need to incorporate circuitry to deal with the switching harmonics. Converting the multiplex signal back into left and right audio signals

18125-687: The riverbed is often dry or contains little water due to large irrigation diversions. South Mountain separates the community of Ahwatukee from the rest of the city. According to the United States Census Bureau, the city has an area of 517.9 sq mi (1,341 km ), of which 516.7 sq mi (1,338 km ) is land and 1.2 sq mi (3.1 km ), or 0.2%, is water. Maricopa County grew by 711% from 186,000 in 1940 to 1,509,000 by 1980, due in part to air conditioning, cheap housing, and an influx of retirees. The once "modest urban sprawl" now "grew by 'epic' proportions—not only

18270-415: The separation as the signal-to-noise ratio worsens, eventually going to mono while still indicating a stereo signal is received. As with monaural transmission, it is normal practice to apply pre-emphasis to the left and right channels before encoding and to apply de-emphasis at the receiver after decoding. In the U.S. around 2010, using single-sideband modulation for the stereo subcarrier was proposed. It

18415-455: The site of its new research and development center for military electronics. Seeing the same advantages as Motorola, other high-tech companies, such as Intel and McDonnell Douglas , moved into the valley and opened manufacturing operations. By 1950, over 105,000 people resided in the city and thousands more in surrounding communities. The 1950s growth was spurred on by advances in air conditioning, which allowed homes and businesses to offset

18560-442: The slogan "Rock and Rhythm" and programmed a mix of "new wave", techno, punk, and some classic rock from the 1950s and 1960s. The station gathered media attention, but it was dwarfed by KROQ-FM's stellar ratings and Rick Carroll-consulted "Rock of the 80s" Alternative format. In late 1985, KNAC was acquired by Fred Sands, a Los Angeles-based realtor. On January 8, 1986, the station flipped to a " Hard Rock / Heavy Metal music " format,

18705-405: The station played enough "cutting edge" artists of the day and acquired a legend that survived long beyond its demise in spring 1995. The station inspired tribute pages and an Internet radio station. In 1995, Liberman Broadcasting , a Spanish-language broadcasting company, bought KNAC for $ 13 million. On February 15th of that year, after playing " Fade to Black " by Metallica , KNAC signed off for

18850-516: The top 25 U.S. radio markets to transmit in Quadraplex. The test results hopefully would prove to the FCC that the system was compatible with existing two-channel stereo transmission and reception and that it did not interfere with adjacent stations. There were several variations on this system submitted by GE, Zenith, RCA, and Denon for testing and consideration during the National Quadraphonic Radio Committee field trials for

18995-473: The town's population stood at 2,453. By 1881, Phoenix's continued growth made the board of trustees obsolete. The Territorial Legislature passed the Phoenix Charter Bill, incorporating Phoenix and providing a mayor-council government; Governor John C. Fremont signed the bill on February 25, 1881, officially incorporating Phoenix as a city with a population of around 2,500. The railroad's arrival in

19140-423: The transmitter carrier frequency due to the stereo audio and pilot tone (at 10% modulation) is where A and B are the pre-emphasized left and right audio signals and f p {\displaystyle f_{p}} =19 kHz is the frequency of the pilot tone. Slight variations in the peak deviation may occur in the presence of other subcarriers or because of local regulations. Another way to look at

19285-527: The use of two FM stations; one transmitting the front audio channels, the other the rear channels. A breakthrough came in 1970 when KIOI ( K-101 ) in San Francisco successfully transmitted true quadraphonic sound from a single FM station using the Quadraplex system under Special Temporary Authority from the FCC . Following this experiment, a long-term test period was proposed that would permit one FM station in each of

19430-546: The valley in the 1880s was the first of several events that made Phoenix a trade center whose products reached eastern and western markets. In response, the Phoenix Chamber of Commerce was organized on November 4, 1888. The city offices moved into the new City Hall at Washington and Central in 1888. The territorial capital moved from Prescott to Phoenix in 1889, and the territorial offices were also in City Hall. The arrival of

19575-615: 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 of it, with few exceptions: The frequency of an FM broadcast station (more strictly its assigned nominal center frequency) is usually a multiple of 100 kHz. In most of South Korea , the Americas , the Philippines , and the Caribbean , only odd multiples are used. Some other countries follow this plan because of

19720-486: Was $ 150,000, down from its $ 262,000 peak in 2007. Crime rates in Phoenix have fallen in recent years, and once troubled, decaying neighborhoods such as South Mountain , Alhambra , and Maryvale have recovered and stabilized. On June 1, 2023, the State of Arizona announced the decision to halt new housing development in the Phoenix metropolitan area that relies solely on groundwater due to a predicted water shortfall. Phoenix

19865-459: Was 1,512,986, the fifth largest just ahead of Philadelphia. After leading the U.S. in population growth for over a decade, the sub-prime mortgage crisis, followed by the recession, led to a slowing in the growth of Phoenix. There were approximately 77,000 people added to the population of the Phoenix metropolitan area in 2009, which was down significantly from its peak in 2006 of 162,000. Despite this slowing, Phoenix's population grew by 9.4% since

20010-755: Was 27.5 kHz. The IF bandwidth was ±5 kHz, as the only goal at the time was to relay AM radio-quality audio. This transmission system used 75 μs audio pre-emphasis like the main monaural audio and subsequently the multiplexed stereo audio. In the late 1950s, several systems to add stereo to FM radio were considered by the FCC . Included were systems from 14 proponents including Crosby, Halstead, Electrical and Musical Industries, Ltd ( EMI ), Zenith, and General Electric. The individual systems were evaluated for their strengths and weaknesses during field tests in Uniontown, Pennsylvania , using KDKA-FM in Pittsburgh as

20155-635: Was also responsible for helping launch the careers of previously low-key metal and hard rock bands, and is often credited for being the first radio station to promote new bands before their large-scale success, including Metallica , Guns N' Roses , Bon Jovi , Megadeth , Skid Row , Metal Church , Pantera , Alice in Chains , Soundgarden , Stone Temple Pilots , White Zombie , Poison , Testament , Stryper , Lizzy Borden , and Armored Saint . However, revenues were not what management had hoped for. While much of KNAC's core-base of artists were considered mainstream,

20300-668: Was an advertising slogan invented to boost tourism. During World War II, Phoenix's economy shifted to that of a distribution center, transforming into an "embryonic industrial city" with the mass production of military supplies. There were three air force fields in the area: Luke Field , Williams Field , and Falcon Field , as well as two large pilot training camps, Thunderbird Field No. 1 in Glendale and Thunderbird Field No. 2 in Scottsdale. A town that had just over 65,000 residents in 1940 became America's fifth largest city by 2020, with

20445-616: Was atop the highest mountain in the northeast United States, Mount Washington , New Hampshire (shut down in 1948); and W9XAO/W55M/WTMJ-FM Milwaukee, Wisconsin (went off air in 1950). A commercial FM broadcasting band was formally established in the United States as of January 1, 1941, with the first fifteen construction permits announced on October 31, 1940. These stations primarily simulcast their AM sister stations, in addition to broadcasting lush orchestral music for stores and offices, classical music to an upmarket listenership in urban areas, and educational programming. On June 27, 1945

20590-523: Was issued to Saul Levine in May 1957 as KBCA. The construction permit was sold the next year to Long Beach FM Broadcasting Company, which moved the proposed facility to Long Beach. It was sold the next year to Harriscope Music Corporation, owned by Bert Harris, and made its debut January 1, 1961, as KLFM. However, Levine did not get the station built, even though he would go on to own KKGO and other California stations. Finally, on New Year's Day 1961, KLFM signed on

20735-565: Was seen as another service which licensees could use to create additional income. Use of SCAs was particularly popular in the US, but much less so elsewhere. Uses for such subcarriers include radio reading services for the blind , which became common and remain so, private data transmission services (for example sending stock market information to stockbrokers or stolen credit card number denial lists to stores, ) subscription commercial-free background music services for shops, paging ("beeper") services, alternative-language programming, and providing

20880-639: Was tested in Germany between July 1979 and December 1981 by IRT . It was based on the Telefunken High ;Com broadband compander system, but was never introduced commercially in FM broadcasting. Yet another system was the CX -based noise reduction system FMX implemented in some radio broadcasting stations in the United States in the 1980s. FM broadcasting has included subsidiary communications authorization (SCA) services capability since its inception, as it

21025-424: Was theorized to be more spectrum-efficient and to produce a 4 dB s/n improvement at the receiver, and it was claimed that multipath distortion would be reduced as well. A handful of radio stations around the country broadcast stereo in this way, under FCC experimental authority. It may not be compatible with very old receivers, but it is claimed that no difference can be heard with most newer receivers. At present,

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