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117-712: A radio program , radio programme , or radio show is a segment of content intended for broadcast on radio . It may be a one-time production, or part of a periodically recurring series. A single program in a series is called an episode . A Radio Network is a complex system designed for the transmission of data, information, or signals via radio waves. These networks are an integral part of modern telecommunications, enabling communication between various devices and services over varying distances. Radio networks have evolved significantly since their inception, with numerous types and technologies emerging to cater to diverse needs and applications. There are different types of networks: In

234-471: A directional antenna transmits radio waves in a beam in a particular direction, or receives waves from only one direction. Radio waves travel at the speed of light in vacuum and at slightly lower velocity in air. The other types of electromagnetic waves besides radio waves, infrared , visible light , ultraviolet , X-rays and gamma rays , can also carry information and be used for communication. The wide use of radio waves for telecommunication

351-418: A microphone , a video signal representing moving images from a video camera , or a digital signal consisting of a sequence of bits representing binary data from a computer. The modulation signal is applied to a radio transmitter . In the transmitter, an electronic oscillator generates an alternating current oscillating at a radio frequency , called the carrier wave because it serves to generate

468-497: A radar screen . Doppler radar can measure a moving object's velocity, by measuring the change in frequency of the return radio waves due to the Doppler effect . Radar sets mainly use high frequencies in the microwave bands, because these frequencies create strong reflections from objects the size of vehicles and can be focused into narrow beams with compact antennas. Parabolic (dish) antennas are widely used. In most radars

585-474: A " push to talk " button on their radio which switches off the receiver and switches on the transmitter. Or the radio link may be full duplex , a bidirectional link using two radio channels so both people can talk at the same time, as in a cell phone. One way, unidirectional radio transmission is called simplex . This is radio communication between a spacecraft and an Earth-based ground station, or another spacecraft. Communication with spacecraft involves

702-569: A "solemn referendum" on the League of Nations , but did not get one. Harding waffled on the League, thereby keeping Idaho senator William Borah and other Republican "irreconcilables" in line. Cox also hedged. He went to the White House to seek Wilson's blessing and apparently endorsed the League, but—upon discovering its unpopularity among Democrats—revised his position to one that would accept

819-627: A Service Regulation specifying that "Radiotelegrams shall show in the preamble that the service is 'Radio ' ". The switch to radio in place of wireless took place slowly and unevenly in the English-speaking world. Lee de Forest helped popularize the new word in the United States—in early 1907, he founded the DeForest Radio Telephone Company, and his letter in the 22 June 1907 Electrical World about

936-537: A compromise candidate between the conservative and progressive wings of the Republican party, and he clinched his nomination on the tenth ballot at the 1920 Republican National Convention . The election was dominated by the American social and political environment in the aftermath of World War I , which was marked by a hostile response to certain aspects of Wilson's foreign policy and a massive reaction against

1053-441: A fifth cousin and nephew-in-law of the late president Theodore Roosevelt, for vice-president. Early favorites for the nomination had included McAdoo and Attorney General Alexander Mitchell Palmer . Others placed in nomination included New York governor Al Smith , United Kingdom ambassador John W. Davis , New Jersey governor Edward I. Edwards , and Oklahoma senator Robert Latham Owen . Socialist Party candidate Eugene V. Debs

1170-661: A former governor of Texas , announced his candidacy on April 21, 1920, in Temple, Texas , under the badge of "American Party". Ferguson was opposed to Democrats whom he saw as too controlled by elite academic interests as seen when Woodrow Wilson endorsed rival Thomas H. Ball in the gubernatorial primary, and hoped to help the Republicans carry Texas for the first time (Texas never went Republican during Reconstruction ). Initially Ferguson and running mate William J. Hough hoped to carry their campaign to other states, but Ferguson

1287-421: A given bandwidth than analog modulation , by using data compression algorithms, which reduce redundancy in the data to be sent, and more efficient modulation. Other reasons for the transition is that digital modulation has greater noise immunity than analog, digital signal processing chips have more power and flexibility than analog circuits, and a wide variety of types of information can be transmitted using

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1404-548: A government license, such as the general radiotelephone operator license in the US, obtained by taking a test demonstrating adequate technical and legal knowledge of safe radio operation. Exceptions to the above rules allow the unlicensed operation by the public of low power short-range transmitters in consumer products such as cell phones, cordless phones , wireless devices , walkie-talkies , citizens band radios , wireless microphones , garage door openers , and baby monitors . In

1521-655: A hyphen about with him [i.e., a hyphenated American ] carries a dagger that he is ready to plunge into the vitals of this Republic whenever he gets ready." Of the $ 5,500,000 raised by supporters of the Irish Republic in the United States in 1919–20, the Dublin parliament ( Dáil Éireann ) voted in June 1920 to spend $ 500,000 on the American presidential election. How this money was spent remains unclear. Ironically,

1638-696: A kilometer away in 1895, and the first transatlantic signal on 12 December 1901. The first commercial radio broadcast was transmitted on 2 November 1920, when the live returns of the Harding-Cox presidential election were broadcast by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA . The emission of radio waves is regulated by law, coordinated by the International Telecommunication Union (ITU), which allocates frequency bands in

1755-493: A large economic cost, but it can also be life-threatening (for example, in the case of interference with emergency communications or air traffic control ). To prevent interference between different users, the emission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU), which allocates bands in the radio spectrum for different uses. Radio transmitters must be licensed by governments, under

1872-595: A metal conductor called an antenna . As they travel farther from the transmitting antenna, radio waves spread out so their signal strength ( intensity in watts per square meter) decreases (see Inverse-square law ), so radio transmissions can only be received within a limited range of the transmitter, the distance depending on the transmitter power, the antenna radiation pattern , receiver sensitivity, background noise level, and presence of obstructions between transmitter and receiver . An omnidirectional antenna transmits or receives radio waves in all directions, while

1989-403: A mobile navigation instrument receives radio signals from multiple navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones , garage door openers , and keyless entry systems , radio signals transmitted from a controller device control

2106-427: A more limited information-carrying capacity and so work best with audio signals (speech and music), and the sound quality can be degraded by radio noise from natural and artificial sources. The shortwave bands have a greater potential range but are more subject to interference by distant stations and varying atmospheric conditions that affect reception. In the very high frequency band, greater than 30 megahertz,

2223-401: A net vote total of 1,540,000 from the twelve largest cities which was the highest amount for any Republican and fifth highest for any candidate from 1920 to 1948. The Democratic vote was almost exactly the vote from 1916, but the Republican vote nearly doubled, as did the "other" vote. As pointed out earlier, the great increase in the total number of votes is mainly attributable to the passage of

2340-504: A plurality for Ferguson. With the tipping point state of Rhode Island being decided by a 31.2 percent margin, the 1920 election has the largest margin of victory in the tipping point state in American history. Wilson had won the support of Americans of German, Italian, Irish, or Jewish descent in the 1916 election, but Cox lost in all of those demographics and received less support from Jewish voters than Debs. Harding received support from over 90 percent of black voters. The distribution of

2457-470: A primitive spark-gap transmitter . Experiments by Hertz and physicists Jagadish Chandra Bose , Oliver Lodge , Lord Rayleigh , and Augusto Righi , among others, showed that radio waves like light demonstrated reflection, refraction , diffraction , polarization , standing waves , and traveled at the same speed as light, confirming that both light and radio waves were electromagnetic waves, differing only in frequency. In 1895, Guglielmo Marconi developed

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2574-420: A public audience. Analog audio is the earliest form of radio broadcast. AM broadcasting began around 1920. FM broadcasting was introduced in the late 1930s with improved fidelity . A broadcast radio receiver is called a radio . Most radios can receive both AM and FM. Television broadcasting is the transmission of moving images by radio, which consist of sequences of still images, which are displayed on

2691-459: A radio signal is usually concentrated in narrow frequency bands called sidebands ( SB ) just above and below the carrier frequency. The width in hertz of the frequency range that the radio signal occupies, the highest frequency minus the lowest frequency, is called its bandwidth ( BW ). For any given signal-to-noise ratio , an amount of bandwidth can carry the same amount of information ( data rate in bits per second) regardless of where in

2808-673: A reference to the radiotelegraph and radiotelegraphy . The use of radio as a standalone word dates back to at least 30 December 1904, when instructions issued by the British Post Office for transmitting telegrams specified that "The word 'Radio'... is sent in the Service Instructions." This practice was universally adopted, and the word "radio" introduced internationally, by the 1906 Berlin Radiotelegraphic Convention, which included

2925-446: A screen on a television receiver (a "television" or TV) along with a synchronized audio (sound) channel. Television ( video ) signals occupy a wider bandwidth than broadcast radio ( audio ) signals. Analog television , the original television technology, required 6 MHz, so the television frequency bands are divided into 6 MHz channels, now called "RF channels". The current television standard, introduced beginning in 2006,

3042-836: A single county was carried by the Democrats in the Pacific section, where they had carried 76 in 1916. In the Mountain section Cox carried only thirteen counties, seven of them located in New Mexico bordering Texas, whereas Wilson carried all but twenty-one Mountain Section counties in 1916. At least one county was lost in every section in the Union and in every state except South Carolina and Mississippi . Eleven counties in Texas recorded

3159-441: A smaller bandwidth than the old analog channels, saving scarce radio spectrum space. Therefore, each of the 6 MHz analog RF channels now carries up to 7 DTV channels – these are called "virtual channels". Digital television receivers have different behavior in the presence of poor reception or noise than analog television, called the " digital cliff " effect. Unlike analog television, in which increasingly poor reception causes

3276-416: A television (video) signal has a greater data rate than an audio signal . The radio spectrum , the total range of radio frequencies that can be used for communication in a given area, is a limited resource. Each radio transmission occupies a portion of the total bandwidth available. Radio bandwidth is regarded as an economic good which has a monetary cost and is in increasing demand. In some parts of

3393-652: A transmitter to control the actions of a device at a remote location. Remote control systems may also include telemetry channels in the other direction, used to transmit real-time information on the state of the device back to the control station. Uncrewed spacecraft are an example of remote-controlled machines, controlled by commands transmitted by satellite ground stations . Most handheld remote controls used to control consumer electronics products like televisions or DVD players actually operate by infrared light rather than radio waves, so are not examples of radio remote control. A security concern with remote control systems

3510-435: A variety of license classes depending on use, and are restricted to certain frequencies and power levels. In some classes, such as radio and television broadcasting stations, the transmitter is given a unique identifier consisting of a string of letters and numbers called a call sign , which must be used in all transmissions. In order to adjust, maintain, or internally repair radiotelephone transmitters, individuals must hold

3627-477: A vote against the persecutions suffered by German-Americans during the war". Not one major German-language newspaper supported Governor Cox. Many Irish Americans , bitterly angry at Wilson's refusal to help Ireland at Versailles, simply abstained from voting in the presidential election. This allowed the Republicans to mobilize the ethnic vote, and Harding swept the big cities. This was the first election in which women from every state were allowed to vote, following

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3744-432: A well-known political figure because of his active and energetic campaign. In 1928, he was elected Governor of New York , and in 1932 he was elected president. He remained in power until his death in 1945 as the longest-serving American president in history. The total vote for 1920 was roughly 26,750,000, an increase of eight million from 1916 . Harding won in all twelve cities with populations above 500,000. Harding won

3861-413: Is amplified in the transmitter and applied to a transmitting antenna which radiates the energy as radio waves. The radio waves carry the information to the receiver location. At the receiver, the radio wave induces a tiny oscillating voltage in the receiving antenna which is a weaker replica of the current in the transmitting antenna. This voltage is applied to the radio receiver , which amplifies

3978-703: Is spoofing , in which an unauthorized person transmits an imitation of the control signal to take control of the device. Examples of radio remote control: Radio jamming is the deliberate radiation of radio signals designed to interfere with the reception of other radio signals. Jamming devices are called "signal suppressors" or "interference generators" or just jammers. During wartime, militaries use jamming to interfere with enemies' tactical radio communication. Since radio waves can pass beyond national borders, some totalitarian countries which practice censorship use jamming to prevent their citizens from listening to broadcasts from radio stations in other countries. Jamming

4095-445: Is a digital format called high-definition television (HDTV), which transmits pictures at higher resolution, typically 1080 pixels high by 1920 pixels wide, at a rate of 25 or 30 frames per second. Digital television (DTV) transmission systems, which replaced older analog television in a transition beginning in 2006, use image compression and high-efficiency digital modulation such as OFDM and 8VSB to transmit HDTV video within

4212-433: Is an audio transceiver , a receiver and transmitter in the same device, used for bidirectional person-to-person voice communication with other users with similar radios. An older term for this mode of communication is radiotelephony . The radio link may be half-duplex , as in a walkie-talkie , using a single radio channel in which only one radio can transmit at a time, so different users take turns talking, pressing

4329-410: Is called "tuning". The oscillating radio signal from the desired station causes the tuned circuit to resonate , oscillate in sympathy, and it passes the signal on to the rest of the receiver. Radio signals at other frequencies are blocked by the tuned circuit and not passed on. A modulated radio wave, carrying an information signal, occupies a range of frequencies . The information ( modulation ) in

4446-427: Is called an uplink , while a link that transmits data from the spacecraft to the ground is called a downlink. Radar is a radiolocation method used to locate and track aircraft, spacecraft, missiles, ships, vehicles, and also to map weather patterns and terrain. A radar set consists of a transmitter and receiver. The transmitter emits a narrow beam of radio waves which is swept around the surrounding space. When

4563-571: Is democracy." False rumors circulated that Senator Harding had "Negro blood," but this did not greatly hurt Harding's election campaign. Governor Cox made a whirlwind campaign that took him to rallies, train station speeches, and formal addresses, reaching audiences totaling perhaps two million, whereas Senator Harding relied upon a " Front Porch Campaign " similar to that of William McKinley in 1896 . It brought thousands of voters to Marion, Ohio , where Harding spoke from his home. GOP campaign manager Will Hays spent some $ 8.1 million, nearly four times

4680-565: Is in radio clocks and watches, which include an automated receiver that periodically (usually weekly) receives and decodes the time signal and resets the watch's internal quartz clock to the correct time, thus allowing a small watch or desk clock to have the same accuracy as an atomic clock. Government time stations are declining in number because GPS satellites and the Internet Network Time Protocol (NTP) provide equally accurate time standards. A two-way radio

4797-417: Is mainly due to their desirable propagation properties stemming from their longer wavelength. In radio communication systems, information is carried across space using radio waves. At the sending end, the information to be sent is converted by some type of transducer to a time-varying electrical signal called the modulation signal. The modulation signal may be an audio signal representing sound from

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4914-524: Is the one-way transmission of information from a transmitter to receivers belonging to a public audience. Since the radio waves become weaker with distance, a broadcasting station can only be received within a limited distance of its transmitter. Systems that broadcast from satellites can generally be received over an entire country or continent. Older terrestrial radio and television are paid for by commercial advertising or governments. In subscription systems like satellite television and satellite radio

5031-595: Is usually accomplished by a powerful transmitter which generates noise on the same frequency as the target transmitter. US Federal law prohibits the nonmilitary operation or sale of any type of jamming devices, including ones that interfere with GPS, cellular, Wi-Fi and police radars. ELF 3 Hz/100 Mm 30 Hz/10 Mm SLF 30 Hz/10 Mm 300 Hz/1 Mm ULF 300 Hz/1 Mm 3 kHz/100 km Harding-Cox presidential election Woodrow Wilson Democratic Warren G. Harding Republican Presidential elections were held in

5148-797: The Communist Party USA . The Communist Party USA attempted to give its presidential nomination to Debs, but he declined the nomination. The Socialist Party held its 1919 convention in Chicago with 140 delegates in attendance. Twenty-six delegates, who were members of the party's left-wing, left the convention. These delegates attempted to unite with the Communist Party USA, but formed the Communist Labor Party of America on September 2, after those attempts failed. The Socialist Party had 100,000 members before

5265-560: The Easter Rising of 1916. Wilson won them over in 1917 by promising to ask Britain to give Ireland its independence. Wilson had won the presidential election of 1916 with strong support from German-Americans and Irish-Americans, largely because of his slogan "He kept us out of war" and the longstanding American policy of isolationism . At the Paris Peace Conference in 1919, however, he reneged on his commitments to

5382-570: The League of Nations . Wilson blamed the Irish Americans and German Americans for the lack of popular support for his unsuccessful campaign to have the United States join the League of Nations , saying, "There is an organized propaganda against the League of Nations and against the treaty proceeding from exactly the same sources that the organized propaganda proceeded from which threatened this country here and there with disloyalty, and I want to say—I cannot say too often—any man who carries

5499-624: The United States on November 2, 1920. Republican senator Warren G. Harding of Ohio defeated Democratic governor James M. Cox of Ohio. It was the first election held after the end of the First World War , and the first election after the ratification of the Nineteenth Amendment which gave equal votes to men and women. It was the third presidential election in which both major party candidates were registered in

5616-504: The ionosphere without refraction , and at microwave frequencies the high-gain antennas needed to focus the radio energy into a narrow beam pointed at the receiver are small and take up a minimum of space in a satellite. Portions of the UHF , L , C , S , k u and k a band are allocated for space communication. A radio link that transmits data from the Earth's surface to a spacecraft

5733-509: The radio spectrum for various uses. The word radio is derived from the Latin word radius , meaning "spoke of a wheel, beam of light, ray". It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier  [ fr ] , Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system. Following Hertz's discovery of

5850-400: The radio spectrum into 12 bands, each beginning at a wavelength which is a power of ten (10 ) metres, with corresponding frequency of 3 times a power of ten, and each covering a decade of frequency or wavelength. Each of these bands has a traditional name: It can be seen that the bandwidth , the range of frequencies, contained in each band is not equal but increases exponentially as

5967-531: The 1920s with the introduction of broadcasting. Electromagnetic waves were predicted by James Clerk Maxwell in his 1873 theory of electromagnetism , now called Maxwell's equations , who proposed that a coupled oscillating electric field and magnetic field could travel through space as a wave, and proposed that light consisted of electromagnetic waves of short wavelength . On 11 November 1886, German physicist Heinrich Hertz , attempting to confirm Maxwell's theory, first observed radio waves he generated using

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6084-515: The 1950s, a small but growing cohort of rock and pop music fans, dissatisfied with the BBC's output, would listen to Radio Luxembourg – but only to some extent and probably not enough to have any impact on the BBC's monopoly; and invariably only at night, when the signal from Luxembourg could be received more easily. During the post-1964 period, offshore radio broadcasting from ships at anchor or abandoned forts (such as Radio Caroline ) helped to supply

6201-628: The Communist Party united in December 1921 to form the Workers Party of America . Edward Henry, who was a friend of Debs, Lena Morrow Lewis , and Oscar Ameringer nominated Debs for the party's nomination on May 13, 1920, and the 134 delegates to the national convention voted unanimously to give him the nomination. Kate Richards O'Hare , who was also in prison, was considered for the vice-presidential nomination, but Seymour Stedman

6318-474: The Earth's atmosphere has less of an effect on the range of signals, and line-of-sight propagation becomes the principal mode. These higher frequencies permit the great bandwidth required for television broadcasting. Since natural and artificial noise sources are less present at these frequencies, high-quality audio transmission is possible, using frequency modulation . Radio broadcasting means transmission of audio (sound) to radio receivers belonging to

6435-549: The Irish-American community, who vehemently denounced him. His dilemma was that Britain was his war ally. Events such as the anti-British Black Tom and Kingsland Explosions in 1916 on American soil (in part the result of wartime Irish and German co-ordination) and the Irish anti-conscription crisis of 1918 were all embarrassing to recall in 1920. Britain had already passed an Irish Home Rule Act in 1914 , suspended for

6552-526: The League only with reservations, particularly on Article Ten, which would require the United States to participate in any war declared by the League (thus taking the same standpoint as Republican Senate leader Henry Cabot Lodge ). As reporter Brand Whitlock observed, the League was an issue important in government circles, but rather less so to the electorate. He also noted that the campaign was not waged on issues: "The people, indeed, do not know what ideas Harding or Cox represents; neither do Harding or Cox. Great

6669-634: The Nineteenth Amendment to the United States Constitution, which gave women the right to vote. Nearly two-thirds of the counties (1,949) were carried by the Republicans. The Democrats carried only 1,101 counties, a smaller number than Alton Parker had carried in 1904 and consequently the smallest number during the Fourth Party System until that point ( Al Smith would carry even fewer in 1928 ). Not

6786-634: The Socialist Party who had come from Russian language federation of the party and other more radical groups within the party started to create their own papers and membership dues and cards. These members supported a platform that was similar to the Communist International and elected twelve of their members to the fifteen-member National Executive Committee. However, there was accusations of election irregularities and an Emergency Convention held on August 30, 1919, suspended seven of

6903-596: The US, these fall under Part 15 of the Federal Communications Commission (FCC) regulations. Many of these devices use the ISM bands , a series of frequency bands throughout the radio spectrum reserved for unlicensed use. Although they can be operated without a license, like all radio equipment these devices generally must be type-approved before the sale. Below are some of the most important uses of radio, organized by function. Broadcasting

7020-487: The United States," "Independence means independence, now as in 1776," "This country will remain American. Its next President will remain in our own country," and "We decided long ago that we objected to foreign government of our people." On election night, November 2, 1920, commercial radio broadcast coverage of election returns for the first time. Announcers at KDKA-AM in Pittsburgh read telegraph ticker results over

7137-401: The actions of a remote device. The existence of radio waves was first proven by German physicist Heinrich Hertz on 11 November 1886. In the mid-1890s, building on techniques physicists were using to study electromagnetic waves, Italian physicist Guglielmo Marconi developed the first apparatus for long-distance radio communication, sending a wireless Morse Code message to a recipient over

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7254-596: The air as they came in. This single station could be heard over most of the Eastern United States by the small percentage of the population that had radio receivers. Harding's landslide came from all directions except the South. Irish- and German-American voters who had backed Wilson and peace in 1916 now voted against Wilson and Versailles. "A vote for Harding", said the German-language press, "is

7371-405: The air simultaneously without interfering with each other because each transmitter's radio waves oscillate at a different rate, in other words, each transmitter has a different frequency , measured in hertz (Hz), kilohertz (kHz), megahertz (MHz) or gigahertz (GHz). The receiving antenna typically picks up the radio signals of many transmitters. The receiver uses tuned circuits to select

7488-414: The beam strikes a target object, radio waves are reflected back to the receiver. The direction of the beam reveals the object's location. Since radio waves travel at a constant speed close to the speed of light , by measuring the brief time delay between the outgoing pulse and the received "echo", the range to the target can be calculated. The targets are often displayed graphically on a map display called

7605-564: The brunt of attack, not the Democratic Party and the domestic proposals of the period 1896–1914. This is one of two elections since the Civil War (along with 1924) where national turnout was below 50 percent. This was also the third presidential election in which both major party candidates were registered in the same home state; the others have been in 1860 , 1904 , 1940 , 1944 , and 2016 . 5.83% of Harding's votes came from

7722-546: The campaign the Socialists had four airplanes drop socialist literature over Toledo, Ohio . The wife of Charles Edward Russell claimed that the ghost of Susan B. Anthony told her to vote for Debs. Over 60,000 people donated to the Socialist Party's campaign fund. Gerber predicted that Debs would receive three million votes and that five Socialists would be elected to Congress. Debs received 913,693 votes with his largest amount of support coming from New York . His vote total

7839-668: The continuous waves which were needed for audio modulation , so radio was used for person-to-person commercial, diplomatic and military text messaging. Starting around 1908 industrial countries built worldwide networks of powerful transoceanic transmitters to exchange telegram traffic between continents and communicate with their colonies and naval fleets. During World War I the development of continuous wave radio transmitters, rectifying electrolytic, and crystal radio receiver detectors enabled amplitude modulation (AM) radiotelephony to be achieved by Reginald Fessenden and others, allowing audio to be transmitted. On 2 November 1920,

7956-436: The convention, Daugherty was quoted as saying, "I don't expect Senator Harding to be nominated on the first, second, or third ballots, but I think we can afford to take chances that about 11 minutes after two, Friday morning of the convention, when 15 or 12 weary men are sitting around a table, someone will say: 'Who will we nominate?' At that decisive time, the friends of Harding will suggest him and we can well afford to abide by

8073-546: The county vote accurately represents the overwhelming character of the majority vote. Harding received 60.35 percent of the total vote, the largest percentage in the Fourth Party System, exceeding Franklin D. Roosevelt 's in 1932 . Although the Democratic share was 34.13 percent, in no section did its voting share sink below 24 percent, and in three sections, the Democrats topped the poll. The Democratic Party

8190-466: The customer pays a monthly fee. In these systems, the radio signal is encrypted and can only be decrypted by the receiver, which is controlled by the company and can be deactivated if the customer does not pay. Broadcasting uses several parts of the radio spectrum, depending on the type of signals transmitted and the desired target audience. Longwave and medium wave signals can give reliable coverage of areas several hundred kilometers across, but have

8307-691: The demand in western Europe for pop and rock music. The BBC launched its own pop music station, BBC Radio 1 , in 1967. International broadcasts became highly popular in major world languages. Of particular impact were programs by the BBC World Service , Voice of America , Radio Moscow , China Radio International , Radio France Internationale , Deutsche Welle , Radio Free Europe/Radio Liberty , Vatican Radio and Trans World Radio . Interest in old-time radio has increased in recent years with programs traded and collected on reel-to-reel tapes , cassettes and CDs and Internet downloads, as well as

8424-570: The existence of radio waves in 1886, the term Hertzian waves was initially used for this radiation. The first practical radio communication systems, developed by Marconi in 1894–1895, transmitted telegraph signals by radio waves, so radio communication was first called wireless telegraphy . Up until about 1910 the term wireless telegraphy also included a variety of other experimental systems for transmitting telegraph signals without wires, including electrostatic induction , electromagnetic induction and aquatic and earth conduction , so there

8541-413: The first commercial radio broadcast was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA featuring live coverage of the Harding-Cox presidential election . Radio waves are radiated by electric charges undergoing acceleration . They are generated artificially by time-varying electric currents , consisting of electrons flowing back and forth in

8658-592: The first radio communication system, using a spark-gap transmitter to send Morse code over long distances. By December 1901, he had transmitted across the Atlantic Ocean. Marconi and Karl Ferdinand Braun shared the 1909 Nobel Prize in Physics "for their contributions to the development of wireless telegraphy". During radio's first two decades, called the radiotelegraphy era, the primitive radio transmitters could only transmit pulses of radio waves, not

8775-618: The frequency increases; each band contains ten times the bandwidth of the preceding band. The term "tremendously low frequency" (TLF) has been used for wavelengths from 1–3 Hz (300,000–100,000 km), though the term has not been defined by the ITU. The airwaves are a resource shared by many users. Two radio transmitters in the same area that attempt to transmit on the same frequency will interfere with each other, causing garbled reception, so neither transmission may be received clearly. Interference with radio transmissions can not only have

8892-471: The frontrunner for the Republican nomination, but he died in 1919 without leaving an obvious heir to his progressive legacy. The major parties turned to littleknown dark horse candidates from the state of Ohio, a swing state with a large number of electoral votes. Cox won on the 44th ballot at the 1920 Democratic National Convention , defeating William Gibbs McAdoo (Wilson's son-in-law), A. Mitchell Palmer , and several other candidates. Harding emerged as

9009-571: The international responsibilities engendered by the Allied victory in World War I and the Treaty of Versailles proved deeply unpopular, causing a reaction against Wilson, who had pushed especially hard for the latter. Irish Americans were powerful in the Democratic party, and groups such as Clan na Gael opposed going to war alongside their enemy Britain, especially after the violent suppression of

9126-527: The lawyer who had advised the fundraisers was Franklin D. Roosevelt , the losing vice-presidential candidate. In any case, the Irish American city machines sat on their hands during the election, allowing the Republicans to roll up unprecedented landslides in every major city. Many German-American Democrats voted Republican or stayed home, giving the GOP landslides in the rural Midwest. Wilson had hoped for

9243-402: The longest transmission distances of any radio links, up to billions of kilometers for interplanetary spacecraft . In order to receive the weak signals from distant spacecraft, satellite ground stations use large parabolic "dish" antennas up to 25 metres (82 ft) in diameter and extremely sensitive receivers. High frequencies in the microwave band are used, since microwaves pass through

9360-472: The money Cox's campaign spent. Hays used national advertising in a major way (with advice from adman Albert Lasker ). The theme was Harding's own slogan "America First". Thus the Republican advertisement in Collier's Magazine for October 30, 1920, demanded, "Let's be done with wiggle and wobble." The image presented in the ads was nationalistic, using catch phrases like "absolute control of the United States by

9477-472: The need for legal restrictions warned that "Radio chaos will certainly be the result until such stringent regulation is enforced." The United States Navy would also play a role. Although its translation of the 1906 Berlin Convention used the terms wireless telegraph and wireless telegram , by 1912 it began to promote the use of radio instead. The term started to become preferred by the general public in

9594-420: The nomination thrown wide open, the party ultimately opted to nominate keynote speaker and Methodist minister Aaron Watkins of Ohio, over other candidates such as 1916 Convention Chair Robert Patton of Illinois, itinerant minister Daniel Poling of Pennsylvania, and Congressman Charles Randall of California. Historian David Leigh Colvin of New York was nominated for the vice presidency. James E. Ferguson ,

9711-581: The party's twelve language federations and expelled the party affiliates in Michigan, Massachusetts, and Ohio. The more radical members of the party held a convention in New York City in June 1919, which was attended by 94 delegates from twenty states. A vote to create a new party was defeated by a vote of 55 to 38 causing 31 delegates to withdraw from the convention. These 31 delegates held their own convention in Chicago on September 1, where they founded

9828-606: The passage of the 19th Amendment to the Constitution in August 1920 (just in time for the general election). Tennessee's vote for Warren G. Harding marked the first time since the end of Reconstruction that even one of the eleven states of the former Confederacy had voted for a Republican presidential candidate. Tennessee had last been carried by a Republican when Ulysses S. Grant claimed it in 1868 . Even though Cox lost badly, his running mate Franklin D. Roosevelt became

9945-505: The picture quality to gradually degrade, in digital television picture quality is not affected by poor reception until, at a certain point, the receiver stops working and the screen goes black. Government standard frequency and time signal services operate time radio stations which continuously broadcast extremely accurate time signals produced by atomic clocks , as a reference to synchronize other clocks. Examples are BPC , DCF77 , JJY , MSF , RTZ , TDF , WWV , and YVTO . One use

10062-408: The popular vote remains the largest popular-vote percentage margin for a Republican, and the largest ever since widespread popular elections began in the 1820s. However, subsequent candidates (in 1936 , 1964 and 1972 ) have exceeded his share of the popular vote. Cox won just 34.1 percent of the popular vote, and Socialist Eugene V. Debs won 3.4 percent, despite being in prison at the time. It

10179-450: The popularity of podcasts . The World United Kingdom United States India Radio In radio communication , used in radio and television broadcasting , cell phones, two-way radios , wireless networking , and satellite communication , among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on

10296-801: The prospect of another run, and ultimately ruled himself out following the death of his daughter early in 1920. On June 8, the Republican National Convention met in Chicago. The race was wide open, and soon the convention deadlocked between Major General Leonard Wood and Governor Frank Orren Lowden of Illinois. Other names placed in nomination included Senators Warren G. Harding from Ohio, Hiram Johnson from California, and Miles Poindexter from Washington, Governor Calvin Coolidge of Massachusetts, philanthropist Herbert Hoover , and Columbia University President Nicholas M. Butler . Senator Robert M. La Follette from Wisconsin

10413-451: The radio frequency spectrum it is located, so bandwidth is a measure of information-carrying capacity . The bandwidth required by a radio transmission depends on the data rate of the information (modulation signal) being sent, and the spectral efficiency of the modulation method used; how much data it can transmit in each kilohertz of bandwidth. Different types of information signals carried by radio have different data rates. For example,

10530-409: The radio signal desired out of all the signals picked up by the antenna and reject the others. A tuned circuit (also called resonant circuit or tank circuit) acts like a resonator , similar to a tuning fork . It has a natural resonant frequency at which it oscillates. The resonant frequency of the receiver's tuned circuit is adjusted by the user to the frequency of the desired radio station; this

10647-451: The radio spectrum, the right to use a frequency band or even a single radio channel is bought and sold for millions of dollars. So there is an incentive to employ technology to minimize the bandwidth used by radio services. A slow transition from analog to digital radio transmission technologies began in the late 1990s. Part of the reason for this is that digital modulation can often transmit more information (a greater data rate) in

10764-415: The radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location to a receiver that is typically colocated with the transmitter. In radio navigation systems such as GPS and VOR ,

10881-456: The radio waves that carry the information through the air. The modulation signal is used to modulate the carrier, varying some aspect of the carrier wave, impressing the information in the modulation signal onto the carrier. Different radio systems use different modulation methods: Many other types of modulation are also used. In some types, a carrier wave is not transmitted but just one or both modulation sidebands . The modulated carrier

10998-793: The reformist zeal of the Progressive Era . The wartime economic boom had collapsed and the country was deep in a recession . Wilson's advocacy for America's entry into the League of Nations , in the face of a return to non-interventionist opinion, challenged his effectiveness as president, and there were wars and revolutions overseas. At home, the year 1919 was marked by major strikes in the meatpacking and steel industries, and large-scale race riots in Chicago and other cities. Anarchist attacks on Wall Street produced fears of radicals and terrorists . The Irish Catholic and German communities were outraged at Wilson's perceived support of their traditional enemy, Great Britain, and his political position

11115-498: The result." Daugherty's prediction described essentially what occurred, but historians Richard C. Bain and Judith H. Parris argue that Daugherty's prediction has been given too much weight in narratives of the convention. Once the presidential nomination was finally settled, the party bosses and Sen. Harding recommended Wisconsin Sen. Irvine Lenroot to the delegates for the second spot, but the delegates revolted and nominated Coolidge, who

11232-527: The return of former president Theodore Roosevelt to the Republican Party after the previous election, speculation quickly grew as to whether he would make another run for the presidency. Roosevelt's health declined seriously in 1918, however, and he died on January 6, 1919. Attention then turned to the party's unsuccessful 1916 candidate, Charles Evans Hughes , who had narrowly fallen short of defeating Wilson that year, but Hughes remained aloof as to

11349-481: The same digital modulation. Because it is a fixed resource which is in demand by an increasing number of users, the radio spectrum has become increasingly congested in recent decades, and the need to use it more effectively is driving many additional radio innovations such as trunked radio systems , spread spectrum (ultra-wideband) transmission, frequency reuse , dynamic spectrum management , frequency pooling, and cognitive radio . The ITU arbitrarily divides

11466-436: The same home state (the others have been in 1860 , 1904 , 1940 , 1944 , and 2016 ), and the last time that the state was not New York. It was the first presidential election to have its results broadcast by radio. Incumbent Democratic president Woodrow Wilson privately hoped for a third term, despite his severe physical and mental disabilities, but he had very little support. Former president Theodore Roosevelt had been

11583-412: The situation around Wilson's illness and incapacity destroyed any credibility he had as a candidate, and in the end he did not formally put himself forward for the nomination. Although William Gibbs McAdoo (Wilson's son-in-law and former Treasury Secretary) was the strongest candidate, Wilson blocked his nomination in hopes a deadlocked convention would demand that he run for a third term, even though he

11700-529: The splits, but it fell to 55,000 members while the Communist Party had 35,000 members and the Communist Labor Party had 10,000 members. The Communist Party claimed to have 60,000 members while the Communist Labor Party claimed to have 30,000 members. The United Communist Party was formed in May 1920 between the Communist Labor Party and some members of the Communist Party. The United Communist Party and

11817-596: The supporters of the Irish Republic , however, which claimed full sovereignty . This position was also supported by many Irish Americans. The American Committee for Relief in Ireland was set up in 1920 to assist victims of the Irish War of Independence of 1919–21. Some Irish-American senators joined the " irreconcilables " who blocked the ratification of the Treaty of Versailles and United States membership in

11934-431: The transmitting antenna also serves as the receiving antenna; this is called a monostatic radar . A radar which uses separate transmitting and receiving antennas is called a bistatic radar . Radiolocation is a generic term covering a variety of techniques that use radio waves to find the location of objects, or for navigation. Radio remote control is the use of electronic control signals sent by radio waves from

12051-624: The war's duration. However the 1916 Easter Rising in Dublin had led to increased support for the more radical Sinn Féin who in 1919 formed the First Dáil , effectively declaring Ireland independent, sparking the Irish War of Independence . Britain was to pass the Government of Ireland Act in late 1920, by which Ireland would have 2 home-ruled states within the British empire. This satisfied Wilson. The provisions of these were inadequate to

12168-510: The weak radio signal so it is stronger, then demodulates it, extracting the original modulation signal from the modulated carrier wave. The modulation signal is converted by a transducer back to a human-usable form: an audio signal is converted to sound waves by a loudspeaker or earphones, a video signal is converted to images by a display , while a digital signal is applied to a computer or microprocessor, which interacts with human users. The radio waves from many transmitters pass through

12285-543: Was a need for a more precise term referring exclusively to electromagnetic radiation. The French physicist Édouard Branly , who in 1890 developed the radio wave detecting coherer , called it in French a radio-conducteur . The radio- prefix was later used to form additional descriptive compound and hyphenated words, especially in Europe. For example, in early 1898 the British publication The Practical Engineer included

12402-577: Was critically weakened after he suffered a stroke in 1919 that left him severely disabled. Harding all but ignored Cox in the race, and essentially campaigned against Wilson by calling for a " return to normalcy ". Harding won a landslide victory , sweeping every state outside of the South and becoming the first Republican since the end of Reconstruction to win a former state of the Confederacy , Tennessee . Harding's victory margin of 26.2 percent in

12519-517: Was incarcerated at the Atlanta federal penitentiary at the time for advocating non-compliance with the draft during World War I. He received the largest number of popular votes ever received by a Socialist Party candidate in the United States, although not the largest percentage of the popular vote. Debs received double this percentage in the election of 1912 . The 1920 election was Debs's fifth and last attempt to become president. In 1919, members of

12636-504: Was not formally placed in nomination, but received the votes of his state delegation nonetheless. Harding was nominated for president on the tenth ballot, after some delegates shifted their allegiances. The results of the ten ballots were as follows: Harding's nomination, said to have been secured in negotiations among party bosses in a " smoke-filled room ," was engineered by Harry M. Daugherty , Harding's political manager, who became United States Attorney General after his election. Before

12753-435: Was only opposed by six. Upon hearing of his nomination however Bryan declined the gesture, not wishing to remain singularly focused on the prohibition question or to sever his ties with the Democratic Party entirely. Some had considered Billy Sunday a possible substitute but Sunday was "satisfied" with Republican nominee Warren Harding, while others thought about potentially nominating Henry Ford as their standard-bearer. With

12870-636: Was over 50 percent more than what Allan L. Benson had received in the 1916 election. Debs later chose to not run for president in the 1924 election and instead supported Robert M. La Follette . 1920 Prohibition Party ticket Aaron S. Watkins D. Leigh Colvin Meeting in Lincoln, Nebraska, there was some question whether the Prohibition Party would field an independent ticket as opposed to endorsing either Harding or Cox, but this

12987-470: Was predicated on either making a clear statement that they would not move to weaken the Eighteenth Amendment ; neither chose to make any such commitment. The ticket favored by most present was that of William Jennings Bryan for president and William "Billy" Sunday for vice president, and indeed when a motion was made to nominate Bryan by acclamation, of the more than two hundred present it

13104-508: Was selected by a vote of 106 to 26, which was later made unanimous, in order to have one of the candidates campaign. James H. Maurer was also considered for the vice-presidential nomination, but he declined due to his duties as head of the Pennsylvania Federation of Labor. Debs accepted the presidential nomination in an Atlanta prison on May 29, after being notified by Seymour, James Oneal , and Julius Gerber . During

13221-545: Was seriously ill, physically immobile, and in seclusion at the time. The Democrats, meeting in San Francisco between June 28 and July 6 (the first time a major party held its nominating convention in an urban center on the Pacific coast), nominated another newspaper editor from Ohio, Governor James M. Cox , as their presidential candidate, and 38-year-old Assistant Secretary of the Navy Franklin D. Roosevelt ,

13338-459: Was still a significant opposition on national terms, even though Cox won only eleven states and had fewer votes in the electoral college than Parker had won in 1904. More than two-thirds of the Cox vote was in states carried by Harding. The distribution of the vote by counties, and the study of percentages in sections, states, and counties, seem to show that it was Wilson and foreign policies that received

13455-452: Was the first election in which women had the right to vote in all 48 states, which caused the total popular vote to increase dramatically, from 18.5 million in 1916 to 26.8 million in 1920. Both major-party vice-presidential nominees would later succeed to the presidency: Calvin Coolidge (Republican) upon Harding's death in 1923 and Franklin D. Roosevelt (Democratic) after defeating Republican president Herbert Hoover in 1932. Following

13572-510: Was unable to get on the ballot anywhere outside of Texas. Ferguson did manage to gain almost 10 percent of the vote in Texas, and won eleven counties in the southeast of the state. Warren Harding's main campaign slogan was a "return to normalcy", playing upon the weariness of the American public after the social upheaval of the Progressive Era , World War I , and the Spanish flu . Additionally,

13689-611: Was very popular over his handling of the Boston Police Strike from the year before. The Tally: Source for convention coverage: Richard C. Bain and Judith H. Parris, Convention Decisions and Voting Records (Washington DC: Brookings Institution, 1973), pp. 200–208. It was widely accepted prior to the election that President Woodrow Wilson would not run for a third term, and certainly would not be nominated if he did so. While Vice President Thomas R. Marshall long had desired to succeed Wilson, his indecisive handling of

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