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class="vector-toc-numb">1.6</span> <span>F - Ultra-wideband operation</span> </div> </a> <ul id="toc-F_-_Ultra-wideband_operation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-G_-_Access_Broadband_over_Power_Line" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#G_-_Access_Broadband_over_Power_Line"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.7</span> <span>G - Access Broadband over Power Line</span> </div> </a> <ul id="toc-G_-_Access_Broadband_over_Power_Line-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-H_-_Television_Band_Devices" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#H_-_Television_Band_Devices"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.8</span> <span>H - Television Band Devices</span> </div> </a> <ul id="toc-H_-_Television_Band_Devices-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Subjects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Subjects"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Subjects</span> </div> </a> <button aria-controls="toc-Subjects-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Subjects subsection</span> </button> <ul id="toc-Subjects-sublist" class="vector-toc-list"> <li id="toc-Unintentional_radiators" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Unintentional_radiators"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Unintentional radiators</span> </div> </a> <ul id="toc-Unintentional_radiators-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Unlicensed_broadcasting" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" 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Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Title+47+CFR+Part+15%22">"Title 47 CFR Part 15"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Title+47+CFR+Part+15%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Title+47+CFR+Part+15%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Title+47+CFR+Part+15%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Title+47+CFR+Part+15%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Title+47+CFR+Part+15%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">July 2010</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Original_research plainlinks metadata ambox ambox-content ambox-Original_research" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/40px-Ambox_important.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/60px-Ambox_important.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/b/b4/Ambox_important.svg/80px-Ambox_important.svg.png 2x" data-file-width="40" data-file-height="40" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>possibly contains <a href="/wiki/Wikipedia:No_original_research" title="Wikipedia:No original research">original research</a></b>.<span class="hide-when-compact"> Please <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Title_47_CFR_Part_15&action=edit">improve it</a> by <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verifying</a> the claims made and adding <a href="/wiki/Wikipedia:Citing_sources#Inline_citations" title="Wikipedia:Citing sources">inline citations</a>. Statements consisting only of original research should be removed.</span> <span class="date-container"><i>(<span class="date">July 2010</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> </div> </div><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p><a href="/wiki/Code_of_Federal_Regulations" title="Code of Federal Regulations">Code of Federal Regulations</a>, <b><a rel="nofollow" class="external text" href="https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&SID=aad0dee9d5dd560e44f29c7d58918f9d&h=L&mc=true&n=pt47.1.15&r=PART&ty=HTML">Title 47, Part 15</a> (47 CFR 15)</b> is an oft-quoted part of <a href="/wiki/Federal_Communications_Commission" title="Federal Communications Commission">Federal Communications Commission</a> (FCC) <a href="/wiki/Rulemaking" title="Rulemaking">rules</a> and <a href="/wiki/Regulation" title="Regulation">regulations</a> regarding <a href="/wiki/License" title="License">unlicensed</a> <a href="/wiki/Transmission_(telecom)" class="mw-redirect" title="Transmission (telecom)">transmissions</a>. It is a part of <a href="/wiki/Title_47_of_the_Code_of_Federal_Regulations" title="Title 47 of the Code of Federal Regulations">Title 47 of the Code of Federal Regulations</a> (CFR), and regulates everything from <a href="/wiki/Spurious_emission" title="Spurious emission">spurious emissions</a> to unlicensed <a href="/wiki/Low-power_broadcasting" title="Low-power broadcasting">low-power broadcasting</a>. Nearly every electronics device sold inside the <a href="/wiki/United_States" title="United States">United States</a> radiates unintentional emissions, and must be reviewed to comply with Part 15 before it can be advertised or sold in the US market. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Subparts">Subparts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=1" title="Edit section: Subparts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Expand_section plainlinks metadata ambox mbox-small-left ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><a href="/wiki/File:Wiki_letter_w_cropped.svg" class="mw-file-description"><img alt="[icon]" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/20px-Wiki_letter_w_cropped.svg.png" decoding="async" width="20" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/30px-Wiki_letter_w_cropped.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/40px-Wiki_letter_w_cropped.svg.png 2x" data-file-width="44" data-file-height="31" /></a></span></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs expansion</b>. You can help by <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=">adding to it</a>. <span class="date-container"><i>(<span class="date">July 2010</span>)</i></span></div></td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="A_-_General"><span class="anchor" id="Class_A"></span> A - General</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=2" title="Edit section: A - General"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Subpart A includes 21 sections from 15.1 to 15.38. </p><p><span><a class="mw-selflink selflink">47 CFR</a> <a rel="nofollow" class="external text" href="https://www.ecfr.gov/current/title-47/section-15.1">15.1</a></span> states that any radiator (that which emits radio energy), whether or not intentional, must be licensed unless it meets 47 CFR 15 or is otherwise exempted by the FCC. </p><p><br /> <span><a class="mw-selflink selflink">47 CFR</a> <a rel="nofollow" class="external text" href="https://www.ecfr.gov/current/title-47/section-15.3">15.3</a></span> the definitions are defined by the definition given. </p><p><span><a class="mw-selflink selflink">47 CFR</a> <a rel="nofollow" class="external text" href="https://www.ecfr.gov/current/title-47/section-15.5">15.5</a></span> contains a general provision that devices may not cause interference and must accept any interference received. You are cautioned that any changes or modifications to devices not expressly approved by the party responsible for compliance may void your authority to operate devices. </p><p><br /> <span><a class="mw-selflink selflink">47 CFR</a> <a rel="nofollow" class="external text" href="https://www.ecfr.gov/current/title-47/section-15.5">15.5</a></span> prohibits intentional <a href="/wiki/Damped_wave_(radio_transmission)" title="Damped wave (radio transmission)">damped wave</a> transmissions such as <a href="/wiki/Spark-gap_transmitter" title="Spark-gap transmitter">spark-gap transmitters</a> which were common before the 1920s but occupy a needlessly wide range of frequencies. </p><p><span><a class="mw-selflink selflink">47 CFR</a> <a rel="nofollow" class="external text" href="https://www.ecfr.gov/current/title-47/section-15.9">15.9</a></span> prohibits operating a device under Part 15 for the purpose of <a href="/wiki/Eavesdropping" title="Eavesdropping">eavesdropping</a>, except when under lawful authority of law enforcement or when all parties in a conversation consent. </p> <div class="mw-heading mw-heading3"><h3 id="B_-_Unintentional_radiators"><span class="anchor" id="Class_B"></span> B - Unintentional radiators</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=3" title="Edit section: B - Unintentional radiators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Subpart B deals with <a href="/wiki/Unintentional_radiator" title="Unintentional radiator">unintentional radiators</a>—devices for which the purpose is not to produce radio waves, but which do anyway, such as <a href="/wiki/Computer" title="Computer">computers</a>. There are 16 sections between 15.101 and 15.123. </p> <div class="mw-heading mw-heading3"><h3 id="C_-_Intentional_radiators"><span class="anchor" id="Class_C"></span> C - Intentional radiators</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=4" title="Edit section: C - Intentional radiators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Subpart C deals with devices that are specifically designed to produce coherent radio waves, such as small <a href="/wiki/Transmitter" title="Transmitter">transmitters</a>. Specific to <a href="/wiki/Broadcasting" title="Broadcasting">broadcasting</a>, <a rel="nofollow" class="external text" href="https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&SID=aad0dee9d5dd560e44f29c7d58918f9d&h=L&mc=true&n=sp47.1.15.c&r=SUBPART&ty=HTML#se47.1.15_1221">15.221</a> (and <a rel="nofollow" class="external text" href="https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&SID=aad0dee9d5dd560e44f29c7d58918f9d&ty=HTML&h=L&mc=true&r=SECTION&n=se47.1.15_1219">15.219</a>) deal with the AM band; & <a rel="nofollow" class="external text" href="https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&SID=aad0dee9d5dd560e44f29c7d58918f9d&h=L&mc=true&n=sp47.1.15.c&r=SUBPART&ty=HTML#se47.1.15_1239">15.239</a> deals with the FM band. <a rel="nofollow" class="external text" href="https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&SID=aad0dee9d5dd560e44f29c7d58918f9d&h=L&mc=true&n=sp47.1.15.c&r=SUBPART&ty=HTML#se47.1.15_1247">15.247</a> covers most <a href="/wiki/Wi-Fi" title="Wi-Fi">Wi-Fi</a> frequencies that aren't <a href="/wiki/U-NII" class="mw-redirect" title="U-NII">U-NII</a>. </p> <div class="mw-heading mw-heading3"><h3 id="D_-_Unlicensed_PCS_devices"><span class="anchor" id="Class_D"></span> D - Unlicensed PCS devices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=5" title="Edit section: D - Unlicensed PCS devices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sections 15.301 to 15.323 deal with unlicensed <a href="/wiki/Personal_Communications_Service" title="Personal Communications Service">PCS</a> devices from 1.91 to 1.93 <a href="/wiki/Hertz" title="Hertz">GHz</a>. </p><p>Cordless telephones using DECT 6.0 standards use this unlicensed PCS band. </p> <div class="mw-heading mw-heading3"><h3 id="E_-_Unlicensed_NII_devices"><span class="anchor" id="Class_E"></span> E - Unlicensed NII devices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=6" title="Edit section: E - Unlicensed NII devices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>15.401 to 15.407 deal with unlicensed <a href="/wiki/National_Information_Infrastructure" title="National Information Infrastructure">National Information Infrastructure</a> (U-NII) devices </p> <div class="mw-heading mw-heading3"><h3 id="F_-_Ultra-wideband_operation"><span class="anchor" id="Class_F"></span> F - Ultra-wideband operation</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=7" title="Edit section: F - Ultra-wideband operation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>15.501 to 15.525 deal with <a href="/wiki/Ultra-wideband" title="Ultra-wideband">ultra-wideband</a> (UWB) devices, including <a href="/wiki/Ground-penetrating_radar" title="Ground-penetrating radar">ground-penetrating radar</a>. </p> <div class="mw-heading mw-heading3"><h3 id="G_-_Access_Broadband_over_Power_Line"><span class="anchor" id="Class_G"></span> G - Access Broadband over Power Line</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=8" title="Edit section: G - Access Broadband over Power Line"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>15.601 to 15.615 deal with <a href="/wiki/Broadband_over_power_lines" title="Broadband over power lines">broadband over power lines</a> (BPL) devices operating in the 1.705–80 MHz band over <a href="/wiki/Low_voltage" title="Low voltage">medium</a>- or <a href="/wiki/Extra-low_voltage" title="Extra-low voltage">low</a>-<a href="/wiki/Voltage" title="Voltage">voltage</a> <a href="/wiki/Mains_power" class="mw-redirect" title="Mains power">lines</a>. </p> <div class="mw-heading mw-heading3"><h3 id="H_-_Television_Band_Devices"><span class="anchor" id="Class_H"></span> H - Television Band Devices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=9" title="Edit section: H - Television Band Devices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>15.701 to 15.717 deal with (TVBDs), <a href="/wiki/TV-band_device" title="TV-band device">TV-band devices</a> that operate on an available <a href="/wiki/Television_channel" title="Television channel">television channel</a> in the <a href="/wiki/North_American_broadcast_television_frequencies" class="mw-redirect" title="North American broadcast television frequencies">broadcast television band</a>. An available channel is a 6 megahertz television channel that is not being used by an authorized service in a given geographical location, and thus may be used by unlicensed devices under the provisions of this rule part. </p> <div class="mw-heading mw-heading2"><h2 id="Subjects">Subjects</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=10" title="Edit section: Subjects"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Unintentional_radiators">Unintentional radiators</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=11" title="Edit section: Unintentional radiators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Unintentional radiators are designated in two major classes:<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <ul><li><b>Class A</b> Device marketed for use in business/industrial/commercial environments.</li> <li><b>Class B</b> Device marketed for use in a residential environment, notwithstanding use in industrial or commercial environments</li></ul> <p>The emission limits for Class B devices are about 10 dB more restrictive than those for Class A devices since they are more likely to be located closer to radio and television receivers. </p><p>These devices include <a href="/wiki/Personal_computer" title="Personal computer">personal computers</a> and <a href="/wiki/Peripheral_device" class="mw-redirect" title="Peripheral device">peripheral devices</a>, and <a href="/wiki/Electrical_ballast" title="Electrical ballast">electrical ballasts</a> for <a href="/wiki/Fluorescent_light" class="mw-redirect" title="Fluorescent light">fluorescent lights</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Unlicensed_broadcasting">Unlicensed broadcasting</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=12" title="Edit section: Unlicensed broadcasting"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On the standard <a href="/wiki/AM_broadcast_band" class="mw-redirect" title="AM broadcast band">AM broadcast band</a>, under 15.219, transmission power is limited by 100 milliwatts of DC input power to the final RF stage (with restrictions on size, height of, and type of antenna), or alternatively, under 15.221, if the AM transmission originates on the <a href="/wiki/Campus" title="Campus">campus</a> of an educational institution, the transmission can theoretically be any power so long as it does not exceed the field strength limits stated in 15.209 at the perimeter of the campus, 24,000/<i>f</i><sub>kHz</sub> <a href="/wiki/Microvolt" class="mw-redirect" title="Microvolt">μV</a>/m. </p><p><a href="/wiki/Unlicensed_broadcast" class="mw-redirect" title="Unlicensed broadcast">Unlicensed broadcasts</a> on the <a href="/wiki/FM_broadcast_band" title="FM broadcast band">FM broadcast band</a> (88 to 108 MHz) are limited to a <a href="/wiki/Field_strength" title="Field strength">field strength</a> of 250 microvolts per meter (~48 dBμ) measured at a distance of 3 meters. This corresponds to a maximum effective radiated power of 0.01 microwatts.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Emissions must be kept within the 88.0 to 108.0 MHz band under 15.239 rules. </p><p>Unlicensed broadcasts on the <a href="/wiki/TV" class="mw-redirect" title="TV">TV</a> broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other low power auxiliary stations. 87.5 to 88.0 <a href="/wiki/Megahertz" class="mw-redirect" title="Megahertz">MHz</a> is considered part of the <a href="/wiki/Very_high_frequency" title="Very high frequency">VHF</a> TV <a href="/wiki/Band_I" title="Band I">low band</a>. For TV, 15.241 and 15.242 deal with <a href="/wiki/Band_III" title="Band III">high VHF</a> (channels 7 to 13), 15.242 also deals with <a href="/wiki/UHF" class="mw-redirect" title="UHF">UHF</a> (<a href="/wiki/Band_IV" title="Band IV">band IV</a> and <a href="/wiki/Band_V" title="Band V">band V</a>). </p> <div class="mw-heading mw-heading3"><h3 id="Common_uses_of_Part_15_transmitters">Common uses of Part 15 transmitters</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=13" title="Edit section: Common uses of Part 15 transmitters"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Frequently encountered types of "Part 15" transmitters include: </p> <ul><li><a href="/wiki/IEEE_802.11" title="IEEE 802.11">802.11</a> <a href="/wiki/Wireless_LAN" title="Wireless LAN">wireless LANs</a>: (e.g. <a href="/wiki/WiFi" class="mw-redirect" title="WiFi">WiFi</a>): 2.4 GHz, 5 GHz (<a href="/wiki/U-NII" class="mw-redirect" title="U-NII">U-NII</a>)</li> <li><a href="/wiki/IEEE_802.15" title="IEEE 802.15">802.15</a> <a href="/wiki/Personal_area_network" title="Personal area network">PANs</a> (e.g. <a href="/wiki/Bluetooth" title="Bluetooth">Bluetooth</a>, <a href="/wiki/Zigbee" title="Zigbee">Zigbee</a>): 2.4 GHz</li> <li><a href="/wiki/Cordless_phone" class="mw-redirect" title="Cordless phone">Cordless phones</a>: 900 MHz; 1.9 (U-PCS), 2.4, 5 GHz (U-NII)</li> <li><a href="/wiki/Microbroadcasting" title="Microbroadcasting">Microbroadcasting</a>, often by hobbyists, <a href="/wiki/Drive-in_theater" title="Drive-in theater">drive-in theaters</a>, or on <a href="/wiki/College_radio" class="mw-redirect" title="College radio">college</a> or <a href="/wiki/List_of_unlicensed_high_school_radio_stations" class="mw-redirect" title="List of unlicensed high school radio stations">high school</a> campuses.</li> <li><a href="/wiki/FM_transmitter_(personal_device)" title="FM transmitter (personal device)">Small FM radio transmitters</a> designed to hook to the audio output of an <a href="/wiki/IPod" title="IPod">iPod</a> or other portable audio device and broadcast the audio so that it can be heard through a <a href="/wiki/Car_audio" class="mw-redirect" title="Car audio">car audio</a> system that is not equipped with an audio input.</li> <li>Very low power transmitters, often referred to as <i>"talking roadsign"</i>, <i>"talking houses"</i> or <i>"talking billboards",</i> which will air a repeating loop of highway construction, traffic, promotional or advertising information (see <a href="/wiki/Travelers%27_information_station" title="Travelers' information station">Travelers' information station</a>). These transmitters typically operate on empty channels on the AM broadcast band. A sign placed near the transmitter is used to entice passersby (nearly always in automobiles) to tune in. The talking house gets its name from the fact that such transmitters are installed at houses that are on sale, thus enabling a passerby to learn features of the interior of the house without touring the building.</li> <li>Some <a href="/wiki/Wireless_microphone" title="Wireless microphone">wireless microphones</a> and <a href="/wiki/Headset_(audio)" class="mw-redirect" title="Headset (audio)">headsets</a> that broadcast to a receiver which amplifies the audio. Wireless microphones allow the user to move about freely, unlike a conventional microphone and are thus popular with musicians. Some professional wireless microphones and 'low power auxiliary' stations (including those labeled as "UHF") are licensed under Part 74, Subpart H of the FCC's rules. However, as of January 2010, many professional wireless microphones, and other Part 74 certified 'low power auxiliary' stations with a 50 mW output or less, can be operated in the "core TV band" (TV channels VHF 2-13 and UHF 14-51, except 37) frequencies without a license under a waiver of Part 15 rules. This waiver is expected to become permanent.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Units using the high UHF channels (700 MHz band) revoked from the <a href="/wiki/North_American_broadcast_television_frequencies" class="mw-redirect" title="North American broadcast television frequencies">TV bandplan</a> in June 2009 became illegal to operate in June 2010.</li> <li>Toys such as the popular late-1970s <a href="/wiki/Mr._Microphone" class="mw-redirect" title="Mr. Microphone">Mr. Microphone</a> and its imitators, which would broadcast the user's voice to a nearby <a href="/wiki/Radio_receiver" title="Radio receiver">radio receiver</a>. Variations on this type of transmitter were advertised for sale in radio <a href="/wiki/Magazine" title="Magazine">magazines</a> as far back as the 1920s.</li> <li><a href="/wiki/Walkie_talkie" class="mw-redirect" title="Walkie talkie">Walkie talkies</a> intended for children's use, baby monitors, and some older <a href="/wiki/Cordless_phone" class="mw-redirect" title="Cordless phone">cordless phones</a> operate on frequencies in the 49 MHz band or at the upper end of the AM broadcast band.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2013)">citation needed</span></a></i>]</sup></li> <li>Remote controls for various toys, garage door openers, etc. These transmitters usually operate in the 27, 72-76, or 315-433MHz ranges; data stream duty cycle has to be limited due to certain transmit power requirements. However, some remote control devices operate under Part 95 of the FCC rules, which permit higher transmit power on the 26/27 MHz and 72 MHz/75 MHz bands. Lower cost devices on these bands (particularly in the 27 MHz, 49 MHz, 310 MHz, 315 MHz and 433 MHz bands) are regulated under Part 15.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Spurious_emissions">Spurious emissions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=14" title="Edit section: Spurious emissions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Electronic equipment from <a href="/wiki/Computer" title="Computer">computers</a> to intentional <a href="/wiki/Transmitter" title="Transmitter">transmitters</a> can produce unwanted radio signals and are subject to FCC regulation. For digital devices including computers and peripherals, FCC Class B is the more stringent standard, applying to equipment marketed for use in the home, even if it could be used elsewhere. Home users are likely to be annoyed by <a href="/wiki/Interference_(communication)" title="Interference (communication)">interference</a> to TV and radio reception. Class A is a looser standard for equipment intended only for <a href="/wiki/Business" title="Business">business</a>, industrial and commercial settings. </p><p>Transmitters also must adhere to a <a href="/wiki/Spectral_mask" title="Spectral mask">spectral mask</a>, to prevent <a href="/wiki/Adjacent-channel_interference" title="Adjacent-channel interference">adjacent-channel interference</a>, <a href="/wiki/Intermediate_frequency" title="Intermediate frequency">intermediate frequency</a> interference, and <a href="/wiki/Intermodulation" title="Intermodulation">intermodulation</a>. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=15" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Tempest_(codename)" title="Tempest (codename)">TEMPEST</a></li> <li><a href="/wiki/Microbroadcasting" title="Microbroadcasting">Microbroadcasting</a></li> <li><a href="/w/index.php?title=RSS-210&action=edit&redlink=1" class="new" title="RSS-210 (page does not exist)">RSS-210</a>, the equivalent <a href="/wiki/Industry_Canada" class="mw-redirect" title="Industry Canada">Industry Canada</a> law specifying ultra-low-power license-exempt radio broadcasting devices.</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=16" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120113075517/http://www.ce-mag.com/99ARG/Gubish31.html">"Inside FCC Part 15 and Canada's Corresponding Standards"</a>. Ce-mag.com. 1998-01-01. Archived from <a rel="nofollow" class="external text" href="http://www.ce-mag.com/99ARG/Gubish31.html">the original</a> on 2012-01-13<span class="reference-accessdate">. Retrieved <span class="nowrap">2013-08-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Inside+FCC+Part+15+and+Canada%27s+Corresponding+Standards&rft.pub=Ce-mag.com&rft.date=1998-01-01&rft_id=http%3A%2F%2Fwww.ce-mag.com%2F99ARG%2FGubish31.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATitle+47+CFR+Part+15" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110304112834/http://www.fcc.gov/ftp/Bureaus/Mass_Media/Databases/documents_collection/pn910724.pdf">"FCC Public Notice Dated July 24, 1991"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="https://www.fcc.gov/ftp/Bureaus/Mass_Media/Databases/documents_collection/pn910724.pdf">the original</a> <span class="cs1-format">(PDF)</span> on March 4, 2011.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=FCC+Public+Notice+Dated+July+24%2C+1991&rft_id=http%3A%2F%2Fwww.fcc.gov%2Fftp%2FBureaus%2FMass_Media%2FDatabases%2Fdocuments_collection%2Fpn910724.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATitle+47+CFR+Part+15" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20130305015212/http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf">"Before the Federal Communications Commission : Washington, D.C. 20554"</a> <span class="cs1-format">(PDF)</span>. Hraunfoss.fcc.gov. Archived from <a rel="nofollow" class="external text" href="https://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2013-03-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2013-08-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Before+the+Federal+Communications+Commission+%3A+Washington%2C+D.C.+20554&rft.pub=Hraunfoss.fcc.gov&rft_id=http%3A%2F%2Fhraunfoss.fcc.gov%2Fedocs_public%2Fattachmatch%2FFCC-10-16A1.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ATitle+47+CFR+Part+15" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Title_47_CFR_Part_15&action=edit&section=17" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>U.S. government websites: <ul><li><a rel="nofollow" class="external text" href="https://www.fcc.gov/general/rules-regulations-title-47/">FCC rules are located in Title 47 of the Code of Federal Regulations (CFR)</a></li> <li><a rel="nofollow" class="external text" href="https://www.fcc.gov/mb/audio/lowpwr.html">FCC low power broadcast rules</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged June 2024">dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110304112834/http://www.fcc.gov/ftp/Bureaus/Mass_Media/Databases/documents_collection/pn910724.pdf">FCC Public Notice Dated July 24, 1991</a> Covers some basic questions about Part 15 and what is considered a compliant transmission distance.</li> <li><a rel="nofollow" class="external text" href="https://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet63/oet63rev.pdf">OET Bulletin 63 Dated October 1993 and Edited and Reprinted February 1996</a> Covers some popular FAQ's about low-power non-licensed transmitters.</li> <li><a rel="nofollow" class="external text" href="https://www.gpo.gov/fdsys/pkg/CFR-2015-title47-vol1/pdf/CFR-2015-title47-vol1-part15.pdf">2015 edition 47 CFR §15</a></li> <li><a rel="nofollow" class="external text" href="https://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet62/oet62rev.pdf">"Understanding the FCC Regulations for computers and other digital devices"</a> by the FCC</li></ul></li> <li><a rel="nofollow" class="external text" href="http://www.part15.us/">Part15.us</a> – a popular discussion board for Part 15 broadcasting hobbyists</li> <li><a rel="nofollow" class="external text" href="http://www.digitalsyndicate.tv/part15.html">Part 15 AM Radio</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged June 2024">dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060422100300/http://home.att.net/~weatheradio/part15.htm">Part 15 Radio Stations of North America</a> (from Archive.org April 2006)</li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Title_47_CFR_Part_15&oldid=1231980082">https://en.wikipedia.org/w/index.php?title=Title_47_CFR_Part_15&oldid=1231980082</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a 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