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((Refimprove|article|date=January 2010))
'''FM broadcasting in the United States''' began in the 1930s at engineer and inventor [[Edwin Howard Armstrong]]'s experimental station, [[W2XMN]].  The use of [[FM radio]] has been associated with higher sound quality in music radio.

==History of FM radio in the U.S.==
((Main|History of radio#FM and television start|l1=History of radio, FM and television start))

In the United States, FM broadcasting stations currently are assigned to 101 channels, designated 87.9 to 107.9&nbsp;MHz, within a 20.2&nbsp;MHz-wide frequency band, spanning 87.8&ndash;108.0&nbsp;MHz.

In the 1930s investigations were begun into establishing radio stations transmitting on "Very High Frequency" (VHF) assignments above 30&nbsp;MHz. In October 1937, the [[Federal Communications Commission]] (FCC) announced new frequency allocations, which included a band of experimental and educational "[[Apex (radio band)|Apex]]" stations, that consisted of 75 channels spanning from 41.02 to 43.98&nbsp;MHz.<ref name="upper">[https://archive.org/stream/broadcasting13unse_0#page/n749/mode/1up "Upper Bands Set Aside for Television"], ''Broadcasting'', November 1, 1937, pages 60-61.</ref> Like the existing AM band these stations employed amplitude modulation, however the 40&nbsp;kHz spacing between adjacent frequencies was four times as much as the 10&nbsp;kHz spacing on the standard AM broadcast band, which reduced adjacent-frequency interference, and provided more bandwidth for high-fidelity programming.

Also during the 1930s a competing transmission technology, "wide-band frequency modulation", was developed in the United States by [[Edwin Howard Armstrong]], which was promoted as being superior to AM transmissions, in particular due to its high-fidelity and near immunity to static interference. On June 17, 1936 Armstrong formally demonstrated his FM system to the FCC.<ref>[https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SBS19360618.1.2 "New Static-Less Radio Broadcast Eliminates All Extraneous Noises"] (UP), ''San Bernardino (California) Sun'', June 18, 1936, page 2.</ref> That year he also set up the first FM radio station, [[W2XMN]] in Alpine, New Jersey, to function as a demonstration station. In 1937 the [[Yankee Network]], looking to eventually establish commercial FM operations, was granted a construction permit for an experimental station, [[WGTR (Massachusetts)|W1XOJ]], in Paxton, Massachusetts. The first publicized W2XMN broadcast took place on July 18, 1939, which used a high-quality phone line link to rebroadcast a program from [[WQXR-FM|WQXR]] in New York City.<ref>''Rebel in Radio'' by Elliot A. Sanger, 1973, page 50.</ref> On July 24, 1939, W1XOJ inaugurated a regular schedule of 16 hours a day (8 a.m. to midnight).<ref>[https://archive.org/stream/broadcasting17unse#page/n353/mode/1up "Armstrong Modulation System Makes Public Bow on Yankee"], ''Broadcasting'', August 1, 1939, page 24.</ref> On January 5, 1940, Armstrong, working with the Yankee Network, demonstrated FM broadcasting in a long-distance relay network, via five stations in five states.<ref>[https://archive.org/stream/broadcasting18unse#page/n115/mode/1up/ "First F-M Network Broadcast"], ''Broadcasting'', January 15, 1940, page 32.</ref>

In May 1940, largely as the result of Armstrong's efforts, the FCC decided to eliminate the Apex band, and authorized an FM band effective January 1, 1941, operating on 40 channels spanning 42–50&nbsp;MHz.<ref>[https://babel.hathitrust.org/cgi/pt?id=uiug.30112059131711&view=1up&seq=765 "FCC Order No. 67"], ''Federal Register'', May 25, 1940, page 2011.</ref> On October 31, 1940, the [[List of the initial commercial FM station assignments issued by the Federal Communications Commission on October 31, 1940|first 15]] commercial station Construction Permit authorizations were issued.<ref>[https://archive.org/stream/broadcasting19unse#page/n1074/mode/1up "New FM Call Letters Proposed"], ''Broadcasting'', November 15, 1940, page 77.</ref> On March 1, 1941 [[WSM-FM (1941–1951)|W47NV]] began broadcasting in [[Nashville, Tennessee|Nashville]], [[Tennessee]],<ref>[https://archive.org/stream/broadcasting20unse#page/n621/mode/1up "New FM Station of WSM, Nashville, Starts Operation With 70 Hours Weekly"], ''Broadcasting'', March 10, 1941, page 46.</ref> becoming the first fully licensed commercial FM station.<ref>[https://archive.org/stream/broadcasting20unse#page/n744/mode/1up "Really the First"], ''Broadcasting'', March 24, 1941, page 39.</ref> There was significant interest in the new FM band by station owners, however, construction restrictions that went into place during World War II limited the growth of the new service.

Following the end of the war, the FCC moved to standardize its frequency allocations. One area of concern was the effects of [[Tropospheric propagation|tropospheric]] and [[Sporadic E propagation]], which at times reflected station signals over great distances, causing mutual interference. A particularly controversial proposal, spearheaded by the [[RCA|Radio Corporation of America]] (RCA), which was headed by [[David Sarnoff]], was that the FM band needed to be shifted to higher frequencies in order to avoid this potential problem. Armstrong charged that this reassignment had the covert goal of disrupting FM radio development,<ref name="Lessing">((cite book|title=Man Of High Fidelity|author=Lawrence Lessing|publisher=J. B. Lippincott|year=1956))</ref> however RCA's proposal prevailed, and on June 27, 1945 the FCC announced the reassignment of the FM band to 80 channels from 88–106&nbsp;MHz (which was soon expanded to 100 channels from 88–108&nbsp;MHz), while allocating the former FM band frequencies to "non-government fixed and mobile" (42–44&nbsp;MHz), and [[Channel 1 (North American TV)|television channel 1]] (44–50&nbsp;MHz), controversially ignoring the effect of tropospheric and Sporadic E propagation on those services.<ref>[https://archive.org/details/broadcasting291unse/page/n16/mode/1up "FCC Allocates 88-106 mc Band to FM"] by Bill Bailey, ''Broadcasting'', July 2, 1945, pages 13-14.</ref><ref>[https://archive.org/details/broadcasting291unse/page/n67/mode/1up "FCC Allocations Order Text"], ''Broadcasting'', July 2, 1945, pages 64-68.</ref> 

A period of allowing existing FM stations to broadcast on both the original "low" and new "high" FM bands followed, though as late as 1947, in Detroit, there were only 3,000 FM receivers in use for the new band, and 21,000 for the old band.<ref>[http://www.michiguide.com/history/fmhistory/ "From Fledgling to Floundering to Flourishing: A history of FM Broadcasting in Michigan from the 1930s through the 1960s"] by George Bednarik, 2003 (michiguide.com)</ref>  The dual band transition period ended at midnight on January 8, 1949, at which time all low band transmissions had to end, making obsolete 395,000 receivers<ref>((Cite news|url=https://www.newspapers.com/image/93688720|title=395,000 FM Radio Sets Must Be Replaced|last=INS|date=June 27, 1945|work=Journal Gazette|access-date=2017-08-14|page=6|language=en|via=Newspapers.com))</ref>  already purchased by the public for the original band. Although converters were manufactured allowing low band FM sets to receive high band transmissions, they were complicated to install and often as (or more) expensive than buying a new high band set.<ref>((Cite news|url=https://www.newspapers.com/image/308647368|title=Pre-War FM Radio Sets to Become Obsolete Saturday|date=January 6, 1949|work=The Times|access-date=2017-08-14|page=1|language=en|via=Newspapers.com))</ref> The greater expense was the cost for the radio stations converting to the new FM radio band. The FM radio industry did not recover significantly from the setback until the upsurge in high fidelity equipment in the late 1950s.

In the early 1960s, FM began to benefit from increased investment, as broadcasters looked to it to expand their markets; television had been built out by this point, and the shift to music as the dominant format of AM in the wake of television and the rise of [[rock 'n' roll]] had led to an AM band so crowded that the FCC was limiting many stations to [[Clear-channel stations#Daytimers|daytime-only]] operation, a restriction to which FM was not subject. The FCC gave FM two boosts in the early 1960s: first by setting a technical standard for stereo broadcasts, and second by adopting the [[FM Non-Duplication Rule]] in 1964, prohibiting broadcasters with an AM and FM license in cities of more than 100,000 from transmitting more than 50% of the same programming on both stations.<ref name="Head's Broadcasting in America">((cite book |last1=McGregor |first1=Michael A. |last2=Driscoll |first2=Paul D. |last3=McDowell |first3=Walter |title=Head's Broadcasting in America: A Survey of Electronic Media |date=2016 |publisher=[[Routledge]] |isbn=9781317347934 |page=33 |edition=10th |url=https://books.google.com/books?id=CqhYCwAAQBAJ&pg=PA33 |access-date=June 24, 2019))</ref>

By the end of the 1970s, 50.1% of radio listeners were listening to FM stations, ending AM's historical lead. By 1982, FM commanded 70% of the general audience, and 84% among the 12- to 24-year-old demographic.<ref name=":0">((Citation|last =Greenberg|url = http://www.billboard.com/articles/columns/pop-shop/473949/michael-jacksons-thriller-at-30-how-one-album-changed-the-world|date = November 29, 2012| access-date = April 15, 2014|first = Steve|publisher = Billboard|title = Michael Jackson's 'Thriller' at 30: How One Album Changed the World))</ref> The shift in popularity of FM radio over AM in United States during the 1970s has been called by record producer [[Steve Greenberg (record producer)|Steve Greenberg]] "a seismic technological shift that had torn apart the very idea of the mass audience upon which pop hits depended".<ref name=":0" /> (AM radio would adapt by shifting its focus to [[talk radio]], which would be deregulated in the late 1980s after the repeal of the [[Fairness Doctrine]].)

==FM radio channel assignments in the U.S.==
In the United States, FM broadcasting stations operate on a 20.2&nbsp;MHz-wide frequency band, spanning from 87.8&nbsp;MHz to 108&nbsp;MHz. This is divided into 101 0.2&nbsp;MHz-wide channels, which are designated as channels 200 through 300. In actual practice, few except the FCC use these channel numbers; the frequencies are used instead. (Stations that broadcast on 87.7&nbsp;MHz are in actuality licensed as television stations.)
{| class="wikitable"
|+FM radio channels, established in 1945<ref>[https://archive.org/stream/broadcasting292unse#page/n685/mode/1up/ "FCC Adopts FM Set Numbering System"], ''Broadcasting'', November 19, 1945, page 4.</ref> (channel 200 was added in 1978)<ref>[https://worldradiohistory.com/Archive-BC/BC-1978/1978-06-12-BC.pdf#page=50 "FCC moves to overhaul rules for noncommercial radio and TV"], ''Broadcasting'', June 12, 1978, page 50.</ref>
!MHz
!Chan No.
!MHz
!Chan No.
!MHz
!Chan No.
!MHz
!Chan No.
!MHz
!Chan No.
|-
|87.9
|200
|92.9
|225
|97.9
|250
|102.9
|275
|107.9
|300
|-
|88.1
|201
|93.1
|226
|98.1
|251
|103.1
|276
|-
|88.3
|202
|93.3
|227
|98.3
|252
|103.3
|277
|-
|88.5
|203
|93.5
|228
|98.5
|253
|103.5
|278
|-
|88.7
|204
|93.7
|229
|98.7
|254
|103.7
|279
|-
|88.9
|205
|93.9
|230
|98.9
|255
|103.9
|280
|-
|89.1
|206
|94.1
|231
|99.1
|256
|104.1
|281
|-
|89.3
|207
|94.3
|232
|99.3
|257
|104.3
|282
|-
|89.5
|208
|94.5
|233
|99.5
|258
|104.5
|283
|-
|89.7
|209
|94.7
|234
|99.7
|259
|104.7
|284
|-
|89.9
|210
|94.9
|235
|99.9
|260
|104.9
|285
|-
|90.1
|211
|95.1
|236
|100.1
|261
|105.1
|286
|-
|90.3
|212
|95.3
|237
|100.3
|262
|105.3
|287
|-
|90.5
|213
|95.5
|238
|100.5
|263
|105.5
|288
|-
|90.7
|214
|95.7
|239
|100.7
|264
|105.7
|289
|-
|90.9
|215
|95.9
|240
|100.9
|265
|105.9
|290
|-
|91.1
|216
|96.1
|241
|101.1
|266
|106.1
|291
|-
|91.3
|217
|96.3
|242
|101.3
|267
|106.3
|292
|-
|91.5
|218
|96.5
|243
|101.5
|268
|106.5
|293
|-
|91.7
|219
|96.7
|244
|101.7
|269
|106.7
|294
|-
|91.9
|220
|96.9
|245
|101.9
|270
|106.9
|295
|-
|92.1
|221
|97.1
|246
|102.1
|271
|107.1
|296
|-
|92.3
|222
|97.3
|247
|102.3
|272
|107.3
|297
|-
|92.5
|223
|97.5
|248
|102.5
|273
|107.5
|298
|-
|92.7
|224
|97.7
|249
|102.7
|274
|107.7
|299
|}
To receive a station, an FM receiver is tuned to the center frequency of the station's channel. The lowest and almost-unused channel, channel 200, extends from 87.8&nbsp;MHz to 88.0&nbsp;MHz; thus its center frequency is 87.9&nbsp;MHz. Channel 201 has a center frequency of 88.1&nbsp;MHz, and so on, up to channel 300, which extends from 107.8 to 108.0&nbsp;MHz and has a center frequency of 107.9&nbsp;MHz.

Because each channel is 0.2&nbsp;MHz wide, the center frequencies of adjacent channels differ by 0.2&nbsp;MHz. Because the lowest channel is centered on 87.9&nbsp;MHz, the tenths digit (in MHz) of the center frequency of any FM station in the United States is always an odd number. FM audio for analog television channel 6 is broadcast at a carrier frequency of 87.75&nbsp;MHz, and many radios can tune this low; full-power stations [[Television in the United States#History of American Television|ceased analog operations in 2009]] under FCC orders, but a few low-power stations are still operated solely for their right to use this frequency and broadcast only nominal video programming, if any (these, too, will reportedly eventually be forced to shut down). For the same reason, assignment restrictions between TV stations on channel 6 and nearby FM stations are stringent: there is only one station in the United States ([[CSN International]] [[broadcast translator|translator]] K200AA in [[Sun Valley, Nevada]]) licensed to operate on 87.9&nbsp;MHz, because it was forced off of another channel. Therefore, in effect, the FM broadcast band comprises only FM channels 201 (88.1&nbsp;MHz) through 300 (107.9&nbsp;MHz).

Originally, FM stations in a market were generally spaced four channels (800&nbsp;kHz) apart. This spacing was developed in response to problems perceived on the original FM band, mostly due to deficiencies in receiver technology of the time. With modern equipment, this is widely understood to be unnecessary, and in many countries shorter spacings are used. (See [[FM broadcast band]].) Other spacing restrictions relate to mixing products with nearby television, air-traffic control, and two-way radio systems as well as other FM broadcast stations. The most significant such taboo restricts the allocation of stations 10.6 and 10.8&nbsp;MHz apart, to protect against mixing products which will interfere with an FM receiver's standard 10.7&nbsp;MHz [[intermediate frequency]] stage.

[[Commercial broadcasting]] is licensed only on channels 221 through 300 (the upper 80 channels, frequencies between 92.1 and 107.9&nbsp;MHz), with 200 through 220 (the lower 21 channels, frequencies between 87.9 and 91.9&nbsp;MHz) reserved for [[non-commercial educational]] (NCE) broadcasting. In some "[[Twin cities (geographical proximity)|Twin city]]" markets close to the [[Canada–United States border|Canada–United States]] or [[Mexico–United States border|Mexico–United States]] border, such as [[Detroit, Michigan]], and [[Windsor, Ontario]], or [[San Diego, California]], and [[Tijuana]], [[Baja California]], commercial stations operating from those countries target U.S. audiences on "reserved band" channels, as neither Canada nor Mexico has such a reservation. Because of this necessary sharing, the FCC reserves a few other channels for such NCE stations.

FM stations in the U.S. are now assigned based on a table of separation distance values from currently licensed stations, based on station "class" (power output, antenna height, and geographical location). These regulations (see [[Docket 80-90]]) have resulted in approximately double the number of possible stations, and increases in allowable power levels, over the original [[bandplan]] scheme described above. All powers are specified as [[effective radiated power]] (ERP), which takes into account the magnifying effect ([[Gain (electronics)|gain]]) of certain [[antenna types]].

[[Image:US FM broadcast zones.png|thumb|right|300px|FM broadcast zones in the U.S.]]

The U.S. is divided into Zone I (roughly the northeastern quarter of the U.S. mainland, excluding the far northern areas), Zone I-A ([[California]] south of 40 degrees [[latitude]], [[U.S. Virgin Islands]], [[Puerto Rico]]), and Zone II (all other locations). The highest-power stations are class C in zone II, and class B in the others. There are no B stations in zone II, nor any C stations in the others. (See the [[list of broadcast station classes]].)  Canada is also divided in this manner, based on the most highly populated regions.

High power is useful in penetrating buildings, diffracting around hills, and refracting for some distance beyond the horizon.  100,000-watt FM stations can regularly be heard up to 100 miles (160&nbsp;km) away, and farther (e.g., 150 miles, 240&nbsp;km) if there are no competing signals.

A few old "[[Grandfathering|grandfathered]]" stations do not conform to these power rules. [[WBCT]] (93.7) in [[Grand Rapids, Michigan|Grand Rapids]], [[Michigan]], runs 320,000 watts ERP, and can increase to 500,000 watts ERP by the terms of its original license. This huge power level does not usually help to increase range as much as one might expect, because [[VHF]] frequencies travel in nearly straight lines over the horizon and off into space. Nevertheless, when there were fewer FM stations competing, this station could be heard near Bloomington, Illinois, almost ((convert|300|mi)) distant.

==See also==
*[[FM broadcasting]]
*[[FM broadcast band]]
*[[AM broadcasting]]
*[[AM stereo]]
*[[List of broadcast station classes]]
*[[History of radio]]
*[[Radio Data System|RDS (Radio Data System)]]
*[[Oldest radio station]]

== References ==
((Reflist))

== External links ==

Related websites
* [http://www.smoke.com.au/~ic/mpx.html An Introduction to FM MPX]
<!-- * [http://www.airwaves.com/archive3/v9_76.html Some history of the FM multiplex system] (search down the page for "pilot-tone multiplex system") -->
<!-- * "''[http://www.salestores1.com/woreltab.html Table of Voltage, Frequency, TV Broadcasting system, Radio Broadcasting, by Country]''". -->
* [http://transmitters.tripod.com/stereo.htm Stereo for Dummies] Many graphs that show waveforms at different points in the FM Multiplex process
* [https://web.archive.org/web/20050702005903/http://doc.weblogs.com/2005/06/29#littleFmTransmitters FM Transmitters]

((Audio broadcasting))
((Telecommunications))

((DEFAULTSORT:Fm Broadcasting In The United States))
[[Category:Radio in the United States]]

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