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Available in 16 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-16" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">16 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AF%D9%8A%D8%B3%D9%8A%D8%A8%D9%84_%D9%85%D9%8A%D9%84%D9%8A_%D9%88%D8%A7%D8%B7" title="ديسيبل ميلي واط – Arabic" lang="ar" hreflang="ar" data-title="ديسيبل ميلي واط" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/DBm" title="DBm – Bulgarian" lang="bg" hreflang="bg" data-title="DBm" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/DBm" title="DBm – Catalan" lang="ca" hreflang="ca" data-title="DBm" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/DBm" title="DBm – Estonian" lang="et" hreflang="et" data-title="DBm" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/DBm" title="DBm – Spanish" lang="es" hreflang="es" data-title="DBm" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AF%DB%8C%E2%80%8C%D8%A8%DB%8C%E2%80%8C%D8%A7%D9%85" title="دی‌بی‌ام – Persian" lang="fa" hreflang="fa" data-title="دی‌بی‌ام" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/DBm" title="DBm – French" lang="fr" hreflang="fr" data-title="DBm" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/DBm" title="DBm – Croatian" lang="hr" hreflang="hr" data-title="DBm" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/DBm" title="DBm – Japanese" lang="ja" hreflang="ja" data-title="DBm" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/DBm" title="DBm – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="DBm" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/DBm" title="DBm – Polish" lang="pl" hreflang="pl" data-title="DBm" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/DBm" title="DBm – Portuguese" lang="pt" hreflang="pt" data-title="DBm" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/DBm" title="DBm – Romanian" lang="ro" hreflang="ro" data-title="DBm" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/DBm" title="DBm – Ukrainian" lang="uk" hreflang="uk" data-title="DBm" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/DBm" title="DBm – Vietnamese" lang="vi" hreflang="vi" data-title="DBm" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%88%86%E8%B4%9D%E6%AF%AB%E7%93%A6" title="分贝毫瓦 – Chinese" lang="zh" hreflang="zh" data-title="分贝毫瓦" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q777017#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div 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class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Power level referenced to one milliwatt</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="/wiki/DBM_(disambiguation)" class="mw-redirect mw-disambig" title="DBM (disambiguation)">DBM (disambiguation)</a>.</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Relationship_between_dBu_and_dBm.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/Relationship_between_dBu_and_dBm.svg/250px-Relationship_between_dBu_and_dBm.svg.png" decoding="async" width="220" height="63" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/Relationship_between_dBu_and_dBm.svg/330px-Relationship_between_dBu_and_dBm.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/04/Relationship_between_dBu_and_dBm.svg/440px-Relationship_between_dBu_and_dBm.svg.png 2x" data-file-width="280" data-file-height="80" /></a><figcaption>A schematic showing the relationship between <a href="/wiki/DBu" class="mw-redirect" title="DBu">dBu</a> (the <a href="/wiki/Voltage_source" title="Voltage source">voltage source</a>) and dBm (the power dissipated as <a href="/wiki/Heat" title="Heat">heat</a> by the 600 Ω <a href="/wiki/Resistor" title="Resistor">resistor</a>)</figcaption></figure> <p><b>dBm</b> or <b>dB<sub>mW</sub></b> (decibel-milliwatts) is a unit of power <a href="/wiki/Level_(logarithmic_quantity)" title="Level (logarithmic quantity)">level</a> expressed using a <a href="/wiki/Logarithmic_scale" title="Logarithmic scale">logarithmic</a> <a href="/wiki/Decibel" title="Decibel">decibel</a> (dB) scale respective to one <a href="/wiki/Milliwatt" class="mw-redirect" title="Milliwatt">milliwatt</a> (mW). It is commonly used by radio, microwave and fiber-optical communication technicians & engineers to measure the <a href="/wiki/Power_(physics)" title="Power (physics)">power</a> of system transmissions on a <a href="/wiki/Log_scale" class="mw-redirect" title="Log scale">log scale</a>, which can express both very large and very small values in a short form. <a href="/wiki/DBW" class="mw-redirect" title="DBW">dBW</a> is a similar unit measured relative to one watt (1,000 mW), rather than a milliwatt. </p><p>The decibel (<b>dB</b>) is a <a href="/wiki/Dimensionless_unit" class="mw-redirect" title="Dimensionless unit">dimensionless unit</a>, used for quantifying the ratio between two values, such as <a href="/wiki/Signal-to-noise_ratio" title="Signal-to-noise ratio">signal-to-noise ratio</a>. The dBm is also dimensionless,<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><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> but since it compares to a fixed reference value, the dBm rating is an absolute one. </p><p>The dBm is not a part of the <a href="/wiki/International_System_of_Units" title="International System of Units">International System of Units</a> (SI) and therefore is discouraged from use in documents or systems that adhere to SI units. (The corresponding SI unit is the watt.) However, the unit <a href="/wiki/Decibel" title="Decibel">decibel</a> (dB), without the 'm' suffix, is permitted for relative quantities, but not accepted for use directly alongside SI units. Ten decibel-milliwatts may be written 10 dB (1 mW) in SI.<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><sup class="reference nowrap"><span title="Page / location: 7.4">: 7.4 </span></sup> </p><p>In audio and telephony, dBm is typically referenced relative to the 600-ohm <a href="/wiki/Electrical_impedance" title="Electrical impedance">impedance</a><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> commonly used in telephone voice networks, while in radio-frequency work dBm is typically referenced relative to a 50-ohm impedance.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Unit_conversions">Unit conversions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DBm&action=edit&section=1" title="Edit section: Unit conversions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A power level of 0 dBm corresponds to a power of 1 milliwatt. A 10 dB increase in level is equivalent to a ten-fold increase in power. Therefore, a 20 dB increase in level is equivalent to a 100-fold increase in power. A 3 dB increase in level is approximately equivalent to doubling the power, which means that a level of 3 dBm corresponds roughly to a power of 2 mW. Similarly, for each 3 dB decrease in level, the power is reduced by about one half, making −3 dBm correspond to a power of about 0.5 mW. </p><p>To express an arbitrary power <span class="texhtml mvar" style="font-style:italic;">P</span> in mW as <span class="texhtml mvar" style="font-style:italic;">x</span> in dBm, the following expression may be used:<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{aligned}x&=10\log _{10}{\frac {P}{1~{\text{mW}}}}\end{aligned}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mtable columnalign="right left right left right left right left right left right left" rowspacing="3pt" columnspacing="0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em" displaystyle="true"> <mtr> <mtd> <mi>x</mi> </mtd> <mtd> <mi></mi> <mo>=</mo> <mn>10</mn> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>10</mn> </mrow> </msub> <mo>⁡</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>P</mi> <mrow> <mn>1</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>mW</mtext> </mrow> </mrow> </mfrac> </mrow> </mtd> </mtr> </mtable> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{aligned}x&=10\log _{10}{\frac {P}{1~{\text{mW}}}}\end{aligned}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2a3e04a9544513ce2de8c933e5c5742aeb2cc1e5" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.843ex; margin-bottom: -0.328ex; width:20.031ex; height:5.509ex;" alt="{\displaystyle {\begin{aligned}x&=10\log _{10}{\frac {P}{1~{\text{mW}}}}\end{aligned}}}" /></span> Conversely, to express an arbitrary power level <span class="texhtml mvar" style="font-style:italic;">x</span> in dBm, as <span class="texhtml mvar" style="font-style:italic;">P</span> in mW: <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{aligned}P&=1~{\text{mW}}\cdot 10^{\frac {x}{10}}\end{aligned}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mtable columnalign="right left right left right left right left right left right left" rowspacing="3pt" columnspacing="0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em" displaystyle="true"> <mtr> <mtd> <mi>P</mi> </mtd> <mtd> <mi></mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>mW</mtext> </mrow> <mo>⋅</mo> <msup> <mn>10</mn> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>x</mi> <mn>10</mn> </mfrac> </mrow> </msup> </mtd> </mtr> </mtable> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{aligned}P&=1~{\text{mW}}\cdot 10^{\frac {x}{10}}\end{aligned}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/61f20974fa2a6e750bcbecd5a08ef24b85e5639b" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.171ex; width:18.07ex; height:3.509ex;" alt="{\displaystyle {\begin{aligned}P&=1~{\text{mW}}\cdot 10^{\frac {x}{10}}\end{aligned}}}" /></span> </p> <div class="mw-heading mw-heading2"><h2 id="Table_of_examples">Table of examples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DBm&action=edit&section=2" title="Edit section: Table of examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Below is a table summarizing useful cases: </p> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Orders_of_magnitude_(power)" title="Orders of magnitude (power)">Orders of magnitude (power)</a></div> <table class="wikitable"> <tbody><tr> <th>Power level</th> <th>Power</th> <th>Notes </th></tr> <tr> <td>526 dBm</td> <td><span class="nowrap"><span data-sort-value="7049360000000000000♠"></span>3.6<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>49</sup> W</span></td> <td><a href="/wiki/First_observation_of_gravitational_waves" title="First observation of gravitational waves">Black hole collision</a>, the power radiated in gravitational waves following the collision <a href="/wiki/First_observation_of_gravitational_waves" title="First observation of gravitational waves">GW150914</a>, estimated at 50 times the power output of all the stars in the observable universe.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>420 dBm</td> <td><span class="nowrap"><span data-sort-value="7039100000000000000♠"></span>1<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>39</sup> W</span></td> <td><a href="/wiki/Cygnus_A" title="Cygnus A">Cygnus A</a>, one of the most powerful radio sources in the sky </td></tr> <tr> <td>296 dBm</td> <td><span class="nowrap"><span data-sort-value="7026384600000000000♠"></span>3.846<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>26</sup> W</span></td> <td>Total power output of the Sun<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>120 dBm</td> <td>1 GW = 1,000,000,000 W</td> <td>Experimental high-power microwave (HPM) generation system, 1 GW at 2.32 GHz for 38 ns<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>105 dBm</td> <td>32 MW</td> <td><a href="/wiki/Eglin_AFB_Site_C-6" title="Eglin AFB Site C-6">AN/FPS-85 Phased Array Space Surveillance Radar</a>, claimed by the US Space Force as the most powerful radar in the world.<sup id="cite_ref-AirForceFactSheet_11-0" class="reference"><a href="#cite_note-AirForceFactSheet-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>95.5 dBm</td> <td>3,600 kW</td> <td><a href="/wiki/High-frequency_Active_Auroral_Research_Program" title="High-frequency Active Auroral Research Program">High-frequency Active Auroral Research Program</a> maximum power output, the most powerful shortwave station in 2012 </td></tr> <tr> <td>80 dBm</td> <td>100 kW</td> <td>Typical <a href="/wiki/Effective_radiated_power" title="Effective radiated power">transmission power</a> of <a href="/wiki/FM_radio" class="mw-redirect" title="FM radio">FM radio</a> station with 50-kilometre (31 mi) range </td></tr> <tr> <td>62 dBm</td> <td>1.588 kW</td> <td>1.5 kW is the maximum legal power output of a US <a href="/wiki/Ham_radio" class="mw-redirect" title="Ham radio">ham radio</a> station.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>60 dBm</td> <td>1 kW = 1,000 W</td> <td>Typical combined radiated RF power of <a href="/wiki/Microwave_oven" title="Microwave oven">microwave oven</a> elements </td></tr> <tr> <td>55 dBm</td> <td>~300 W</td> <td>Typical single-channel RF output power of a <a href="/wiki/Ku_band" title="Ku band">K<sub>u</sub> band</a> <a href="/wiki/Geostationary_satellite" class="mw-redirect" title="Geostationary satellite">geostationary satellite</a> </td></tr> <tr> <td>50 dBm</td> <td>100 W</td> <td>Typical total <a href="/wiki/Black-body_radiation#Human-body_emission" title="Black-body radiation">thermal radiation emitted by a human body</a>, peak at 31.5 THz (9.5 μm) <p>Typical maximum output RF power from a <a href="/wiki/Ham_radio" class="mw-redirect" title="Ham radio">ham radio</a> <a href="/wiki/High_frequency" title="High frequency">HF</a> transceiver without power amplifier </p> </td></tr> <tr> <td>40 dBm</td> <td>10 W</td> <td>Typical <a href="/wiki/Power-line_communication" title="Power-line communication">power-line communication</a> (PLC) transmission power </td></tr> <tr> <td>37 dBm</td> <td>5 W</td> <td>Typical maximal output RF power from a handheld ham radio VHF/UHF transceiver </td></tr> <tr> <td>36 dBm</td> <td>4 W</td> <td>Typical maximal output power for a <a href="/wiki/Citizens_band_radio" title="Citizens band radio">citizens band radio</a> station (27 MHz) in many countries </td></tr> <tr> <td>33 dBm</td> <td>2 W</td> <td>Maximal output from a <a href="/wiki/UMTS" title="UMTS">UMTS</a>/<a href="/wiki/3G" title="3G">3G</a> mobile phone (power class 1 mobiles) <p>Maximal output from a GSM850/900 mobile phone </p> </td></tr> <tr> <td>30 dBm</td> <td>1 W = 1000 <a href="/wiki/Milliwatt" class="mw-redirect" title="Milliwatt">mW</a></td> <td> <p>DCS or GSM 1,800/1,900 MHz mobile phone. <a href="/wiki/EIRP" class="mw-redirect" title="EIRP">EIRP</a> IEEE 802.11a (20 MHz-wide channels) in either 5 GHz subband 2 (5,470–5,725 MHz) provided that transmitters are also IEEE 802.11h-compliant, <i>or</i> <a href="/wiki/U-NII" class="mw-redirect" title="U-NII">U-NII</a>-3 (5,725–5,825 MHz). The former is EU only, the latter is US only. Also, maximal power allowed by the FCC for American amateur radio licensees to fly <a href="/wiki/Radio-controlled_aircraft" title="Radio-controlled aircraft">radio-controlled aircraft</a> or operate RC models of any other type on the amateur radio bands in the US.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> </td></tr> <tr> <td>29 dBm</td> <td>794 mW</td> <td> </td></tr> <tr> <td>28 dBm</td> <td>631 mW</td> <td> </td></tr> <tr> <td>27 dBm</td> <td>500 mW</td> <td>Typical <a href="/wiki/Cellular_phone" class="mw-redirect" title="Cellular phone">cellular phone</a> transmission power <p>Maximal output from a UMTS/3G mobile phone (power class 2 mobiles) </p> </td></tr> <tr> <td>26 dBm</td> <td>400 mW</td> <td> </td></tr> <tr> <td>25 dBm</td> <td>316 mW</td> <td> </td></tr> <tr> <td>24 dBm</td> <td>251 mW</td> <td>Maximal output from a UMTS/3G mobile phone (power class 3 mobiles) <p>1,880–1,900 MHz <a href="/wiki/DECT" title="DECT">DECT</a> (250 mW per 1,728 kHz channel). <a href="/wiki/EIRP" class="mw-redirect" title="EIRP">EIRP</a> for wireless LAN IEEE 802.11a (20 MHz-wide channels) in either the 5 GHz subband 1 (5,180–5,320 MHz) or <a href="/wiki/U-NII" class="mw-redirect" title="U-NII">U-NII</a>-2 and -W ranges (5,250–5,350 MHz & 5,470–5,725 MHz, respectively). The former is EU only, the latter is US only. </p> </td></tr> <tr> <td>23 dBm</td> <td>200 mW</td> <td><a href="/wiki/EIRP" class="mw-redirect" title="EIRP">EIRP</a> for IEEE 802.11n wireless LAN 40 MHz-wide (5 mW/MHz) channels in 5 GHz subband 4 (5,735–5,835 MHz, US only) or 5 GHz subband 2 (5,470–5,725 MHz, EU only). Also applies to 20 MHz-wide (10 mW/MHz) IEEE 802.11a wireless LAN in 5 GHz subband 1 (5,180–5,320 MHz) <i>if</i> also IEEE 802.11h-compliant (otherwise only 3 mW/MHz → 60 mW when unable to dynamically adjust transmission power, and only 1.5 mW/MHz → 30 mW when a transmitter also cannot <a href="/wiki/Dynamic_Frequency_Selection" class="mw-redirect" title="Dynamic Frequency Selection">dynamically select frequency</a>). </td></tr> <tr> <td>22 dBm</td> <td>158 mW</td> <td> </td></tr> <tr> <td>21 dBm</td> <td>125 mW</td> <td>Maximal output from a UMTS/3G mobile phone (power class 4 mobiles) </td></tr> <tr> <td>20 dBm</td> <td>100 mW</td> <td><a href="/wiki/EIRP" class="mw-redirect" title="EIRP">EIRP</a> for IEEE 802.11b/g wireless LAN 20 MHz-wide channels in the 2.4 GHz <a href="/wiki/Wi-Fi" title="Wi-Fi">Wi-Fi</a>/<a href="/wiki/ISM_band" class="mw-redirect" title="ISM band">ISM band</a> (5 mW/MHz). <p><a href="/wiki/Bluetooth" title="Bluetooth">Bluetooth</a> Class 1 radio. Maximal output power from unlicensed <a href="/w/index.php?title=AM_transmitter&action=edit&redlink=1" class="new" title="AM transmitter (page does not exist)">AM transmitter</a> per US <a href="/wiki/Federal_Communications_Commission" title="Federal Communications Commission">FCC</a> rules 15.219<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> </td></tr> <tr> <td>19 dBm</td> <td>79 mW</td> <td> </td></tr> <tr> <td>18 dBm</td> <td>63 mW</td> <td> </td></tr> <tr> <td>17 dBm</td> <td>50 mW</td> <td> </td></tr> <tr> <td>15 dBm</td> <td>32 mW</td> <td>Typical <a href="/wiki/Wireless_LAN" title="Wireless LAN">wireless LAN</a> transmission power in laptops </td></tr> <tr> <td>10 dBm</td> <td>10 mW</td> <td> </td></tr> <tr> <td>7 dBm</td> <td>5.0 mW</td> <td>Common power level required to test the <a href="/wiki/Automatic_gain_control" title="Automatic gain control">automatic gain control</a> circuitry in an AM receiver </td></tr> <tr> <td>6 dBm</td> <td>4.0 mW</td> <td> </td></tr> <tr> <td>5 dBm</td> <td>3.2 mW</td> <td> </td></tr> <tr> <td>4 dBm</td> <td>2.5 mW</td> <td>Bluetooth Class 2 radio, 10 m range </td></tr> <tr> <td>3 dBm</td> <td>2.0 mW</td> <td> </td></tr> <tr> <td>2 dBm</td> <td>1.6 mW</td> <td> </td></tr> <tr> <td>1 dBm</td> <td>1.3 mW</td> <td> </td></tr> <tr> <td>0 dBm</td> <td>1.0 mW = 1000 μW</td> <td>Bluetooth standard (Class 3) radio, 1 m range </td></tr> <tr> <td>−1 dBm</td> <td>794 μW</td> <td> </td></tr> <tr> <td>−3 dBm</td> <td>501 μW</td> <td> </td></tr> <tr> <td>−5 dBm</td> <td>316 μW</td> <td> </td></tr> <tr> <td>−10 dBm</td> <td>100 μW</td> <td>Maximal received signal power of <a href="/wiki/Wireless_network" title="Wireless network">wireless network</a> (802.11 variants) </td></tr> <tr> <td>−13 dBm</td> <td>50.12 μW</td> <td>Dial tone for the <a href="/wiki/Precise_tone_plan" title="Precise tone plan">precise tone plan</a> found on <a href="/wiki/Public_switched_telephone_network" title="Public switched telephone network">public switched telephone networks</a> in <a href="/wiki/North_America" title="North America">North America</a> </td></tr> <tr> <td>−20 dBm</td> <td>10 μW</td> <td> </td></tr> <tr> <td>−30 dBm</td> <td>1.0 μW = 1000 <a href="/wiki/Watt#Multiples" title="Watt">nW</a></td> <td> </td></tr> <tr> <td>−40 dBm</td> <td>100 <a href="/wiki/Watt#Multiples" title="Watt">nW</a></td> <td> </td></tr> <tr> <td>−50 dBm</td> <td>10 nW</td> <td> </td></tr> <tr> <td>−60 dBm</td> <td>1.0 nW = 1000 <a href="/wiki/Watt#Multiples" title="Watt">pW</a></td> <td>The <a href="/wiki/Earth" title="Earth">Earth</a> receives one nanowatt per square metre from a <a href="/wiki/Apparent_magnitude" title="Apparent magnitude">magnitude</a> +3.5 <a href="/wiki/Star" title="Star">star</a><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>−70 dBm</td> <td>100 <a href="/wiki/Watt#Multiples" title="Watt">pW</a></td> <td> </td></tr> <tr> <td>−73 dBm</td> <td>50.12 pW</td> <td>"S9" signal strength, a strong signal, on the <a href="/wiki/S_meter" title="S meter">S meter</a> of a typical <a href="/wiki/Amateur_radio" title="Amateur radio">ham</a> or <a href="/wiki/Shortwave_radio_receiver" title="Shortwave radio receiver">shortwave radio receiver</a> </td></tr> <tr> <td>−80 dBm</td> <td>10 pW</td> <td> </td></tr> <tr> <td>−100 dBm</td> <td>0.1 pW</td> <td>Minimal received signal power of <a href="/wiki/Wireless_network" title="Wireless network">wireless network</a> (802.11 variants) </td></tr> <tr> <td>−111 dBm</td> <td>0.008 pW = 8 <a href="/wiki/Watt#Multiples" title="Watt">fW</a></td> <td><a href="/wiki/Johnson%E2%80%93Nyquist_noise" title="Johnson–Nyquist noise">Thermal noise floor</a> for commercial <a href="/wiki/GPS" class="mw-redirect" title="GPS">GPS</a> single-channel signal bandwidth (2 MHz) </td></tr> <tr> <td>−127.5 dBm</td> <td>0.178 fW = 178 <a href="/wiki/Watt#Multiples" title="Watt">aW</a></td> <td>Typical received signal power from a <a href="/wiki/GPS_satellite" class="mw-redirect" title="GPS satellite">GPS satellite</a> </td></tr> <tr> <td>−174 dBm</td> <td>0.004 aW = 4 <a href="/wiki/Watt#Multiples" title="Watt">zW</a></td> <td>Thermal noise floor for 1 Hz bandwidth at room temperature (20 °C) </td></tr> <tr> <td>−192.5 dBm</td> <td>0.056 <a href="/wiki/Watt#Multiples" title="Watt">zW</a> = 56 <a href="/wiki/Watt#Multiples" title="Watt">yW</a></td> <td>Thermal noise floor for 1 Hz bandwidth in outer space (4 <a href="/wiki/Kelvin" title="Kelvin">kelvins</a>) </td></tr> <tr> <td>−∞ dBm</td> <td>0 W</td> <td>Zero power is not well-expressed in dBm (value is <a href="/wiki/Negative_infinity" class="mw-redirect" title="Negative infinity">negative infinity</a>) </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Standards">Standards</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=DBm&action=edit&section=3" title="Edit section: Standards"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The signal intensity (power per unit area) can be converted to received signal power by multiplying by the square of the wavelength and dividing by 4<span class="texhtml mvar" style="font-style:italic;">π</span> (see <a href="/wiki/Free-space_path_loss" title="Free-space path loss">Free-space path loss</a>). </p><p>In <a href="/wiki/United_States_Department_of_Defense" title="United States Department of Defense">United States Department of Defense</a> practice, <a href="/wiki/Weighting_filter" title="Weighting filter">unweighted</a> measurement is normally understood, applicable to a certain <a href="/wiki/Bandwidth_(signal_processing)" title="Bandwidth (signal processing)">bandwidth</a>, which must be stated or implied. </p><p>In European practice, <a href="/wiki/Psophometric_weighting" title="Psophometric weighting">psophometric weighting</a> may be, as indicated by context, equivalent to <a href="/w/index.php?title=DBm0p&action=edit&redlink=1" class="new" title="DBm0p (page does not exist)">dBm0p</a>, which is preferred. </p><p>In audio, 0 dBm often corresponds to approximately 0.775 volts, since 0.775 V dissipates 1 mW in a 600 Ω load.<sup id="cite_ref-srh_16-0" class="reference"><a href="#cite_note-srh-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> The corresponding voltage level is 0 <a href="/wiki/Decibel#Voltage" title="Decibel">dBu</a>, without the 600 Ω restriction. Conversely, for RF situations with a 50 Ω load, 0 dBm corresponds to approximately 0.224 volts, since 0.224 V dissipates 1 mW in a 50 Ω load. </p><p>In general the relationship between the power level <span class="texhtml mvar" style="font-style:italic;">P</span> in dBm and the <a href="/wiki/Root_mean_square" title="Root mean square"><abbr title="root mean square">RMS</abbr></a> voltage <span class="texhtml mvar" style="font-style:italic;">V</span> in volts across a load of resistance <span class="texhtml mvar" style="font-style:italic;">R</span> (typically used to terminate a transmission line with impedance <span class="texhtml mvar" style="font-style:italic;">Z</span>) is: <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{aligned}V&={\sqrt {R{\frac {10^{P/10}}{1000}}}}\,.\end{aligned}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mtable columnalign="right left right left right left right left right left right left" rowspacing="3pt" columnspacing="0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em" displaystyle="true"> <mtr> <mtd> <mi>V</mi> </mtd> <mtd> <mi></mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <mi>R</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msup> <mn>10</mn> <mrow class="MJX-TeXAtom-ORD"> <mi>P</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>10</mn> </mrow> </msup> <mn>1000</mn> </mfrac> </mrow> </msqrt> </mrow> <mspace width="thinmathspace"></mspace> <mo>.</mo> </mtd> </mtr> </mtable> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{aligned}V&={\sqrt {R{\frac {10^{P/10}}{1000}}}}\,.\end{aligned}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1719b0143ca3e02bf11779196d3f08472510a542" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.171ex; width:17.852ex; height:7.509ex;" alt="{\displaystyle {\begin{aligned}V&={\sqrt {R{\frac {10^{P/10}}{1000}}}}\,.\end{aligned}}}" /></span> </p><p>Expression in dBm is typically used for optical and electrical power measurements, not for other types of power (such as thermal). A <a href="/wiki/Orders_of_magnitude_(power)" title="Orders of magnitude (power)">listing by power levels in watts</a> is available that includes a variety of examples not necessarily related to electrical or optical power. </p><p>The dBm was first proposed as an industry standard<sup id="cite_ref-srh_16-1" class="reference"><a href="#cite_note-srh-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> in 1940.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </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=DBm&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Decibel_watt" title="Decibel watt">Decibel watt</a></li> <li><a href="/wiki/DBm0" title="DBm0">dBm0</a></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=DBm&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><style data-mw-deduplicate="TemplateStyles:r1041539562">.mw-parser-output .citation{word-wrap:break-word}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}</style><span class="citation FS1037C MS188"><span class="noviewer" typeof="mw:File"><span><img alt="Public Domain" src="//upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/12px-PD-icon.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/18px-PD-icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/6/62/PD-icon.svg/24px-PD-icon.svg.png 2x" data-file-width="196" data-file-height="196" /></span></span> This article incorporates <a href="/wiki/Copyright_status_of_works_by_the_federal_government_of_the_United_States" title="Copyright status of works by the federal government of the United States">public domain material</a> from <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 cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220122224547/https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm"><i>Federal Standard 1037C</i></a>. <a href="/wiki/General_Services_Administration" title="General Services Administration">General Services Administration</a>. Archived from <a rel="nofollow" class="external text" href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Federal+Standard+1037C&rft.pub=General+Services+Administration&rft_id=https%3A%2F%2Fwww.its.bldrdoc.gov%2Ffs-1037%2Ffs-1037c.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span> (in support of <a href="/wiki/MIL-STD-188" title="MIL-STD-188">MIL-STD-188</a>).</span> </p> <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 mw-references-columns"><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"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFGreen2019" class="citation book cs1">Green, Lynne D. 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Retrieved <span class="nowrap">13 July</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Cosmicopia&rft.atitle=Ask+Us%3A+Sun&rft.date=2012&rft_id=https%3A%2F%2Fhelios.gsfc.nasa.gov%2Fqa_sun.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLiLiSunZhang2015" class="citation journal cs1">Li, Wei; Li, Zhi-qiang; Sun, Xiao-liang; Zhang, Jun (2015-11-01). <a rel="nofollow" class="external text" href="https://aip.scitation.org/doi/full/10.1063/1.4935500">"A reliable, compact, and repetitive-rate high power microwave generation system"</a>. <i>Review of Scientific Instruments</i>. <b>86</b> (11): 114704. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2015RScI...86k4704L">2015RScI...86k4704L</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1063%2F1.4935500">10.1063/1.4935500</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0034-6748">0034-6748</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/26628156">26628156</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Review+of+Scientific+Instruments&rft.atitle=A+reliable%2C+compact%2C+and+repetitive-rate+high+power+microwave+generation+system&rft.volume=86&rft.issue=11&rft.pages=114704&rft.date=2015-11-01&rft_id=info%3Adoi%2F10.1063%2F1.4935500&rft.issn=0034-6748&rft_id=info%3Apmid%2F26628156&rft_id=info%3Abibcode%2F2015RScI...86k4704L&rft.aulast=Li&rft.aufirst=Wei&rft.au=Li%2C+Zhi-qiang&rft.au=Sun%2C+Xiao-liang&rft.au=Zhang%2C+Jun&rft_id=https%3A%2F%2Faip.scitation.org%2Fdoi%2Ffull%2F10.1063%2F1.4935500&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span></span> </li> <li id="cite_note-AirForceFactSheet-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-AirForceFactSheet_11-0">^</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="http://www.radomes.org/museum/equip/fps-85.html">"AN/FPS-85"</a>. <i>US Air Force Fact Sheet</i>. United States Dept. of Defense<span class="reference-accessdate">. Retrieved <span class="nowrap">May 19,</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=US+Air+Force+Fact+Sheet&rft.atitle=AN%2FFPS-85&rft_id=http%3A%2F%2Fwww.radomes.org%2Fmuseum%2Fequip%2Ffps-85.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</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="http://www.arrl.org/part-97-amateur-radio">"Part 97 - Amateur Radio"</a>. 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Archived from <a rel="nofollow" class="external text" href="http://webhome.cs.uvic.ca/~pearson/files/radiant_flux.html">the original</a> on 2012-06-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-07-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Radiant+Flux+of+a+Magnitude+%2B3.5+Star&rft_id=http%3A%2F%2Fwebhome.cs.uvic.ca%2F~pearson%2Ffiles%2Fradiant_flux.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span></span> </li> <li id="cite_note-srh-16"><span class="mw-cite-backlink">^ <a href="#cite_ref-srh_16-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-srh_16-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFDavis1988" class="citation book cs1">Davis, Gary (1988). <i>The Sound Reinforcement Handbook</i>. Yamaha. p. 22. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0881889008" title="Special:BookSources/0881889008"><bdi>0881889008</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Sound+Reinforcement+Handbook&rft.pages=22&rft.pub=Yamaha&rft.date=1988&rft.isbn=0881889008&rft.aulast=Davis&rft.aufirst=Gary&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFChinnD._K._GannettR._M._Moris1940" class="citation journal cs1">Chinn, H. A.; D. K. Gannett; R. M. Moris (January 1940). <a rel="nofollow" class="external text" href="http://www.aes.org/aeshc/pdf/chinn_a-new-svi.pdf">"A New Standard Volume Indicator and Reference Level"</a> <span class="cs1-format">(PDF)</span>. <i>Proceedings of the Institute of Radio Engineers</i>. <b>28</b> (1): <span class="nowrap">1–</span>17. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FJRPROC.1940.228815">10.1109/JRPROC.1940.228815</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:15458694">15458694</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120213001201/http://www.aes.org/aeshc/pdf/chinn_a-new-svi.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2012-02-13<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-08-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Proceedings+of+the+Institute+of+Radio+Engineers&rft.atitle=A+New+Standard+Volume+Indicator+and+Reference+Level&rft.volume=28&rft.issue=1&rft.pages=%3Cspan+class%3D%22nowrap%22%3E1-%3C%2Fspan%3E17&rft.date=1940-01&rft_id=info%3Adoi%2F10.1109%2FJRPROC.1940.228815&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A15458694%23id-name%3DS2CID&rft.aulast=Chinn&rft.aufirst=H.+A.&rft.au=D.+K.+Gannett&rft.au=R.+M.+Moris&rft_id=http%3A%2F%2Fwww.aes.org%2Faeshc%2Fpdf%2Fchinn_a-new-svi.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADBm" 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=DBm&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.sengpielaudio.com/calculator-volt.htm">The dBm calculator for impedance matching</a></li> <li><a rel="nofollow" class="external text" href="http://cgi.www.telestrian.co.uk/cgi-bin/www.telestrian.co.uk/dBm.pl">Convert dBm to watts</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output 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.navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Decibel_suffixes_(dB)140" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Decibel" title="Template:Decibel"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Decibel" title="Template talk:Decibel"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Decibel" title="Special:EditPage/Template:Decibel"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Decibel_suffixes_(dB)140" style="font-size:114%;margin:0 4em"><a href="/wiki/Decibel" title="Decibel">Decibel</a> <a href="/wiki/Decibel#Suffixes" title="Decibel">suffixes</a> (dB)</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">dBm</a> (or dBmW)</li> <li><a href="/wiki/Decibel_watt" title="Decibel watt">dBW</a></li> <li><a href="/wiki/Decibel#Voltage" title="Decibel">dBV</a></li> <li><a href="/wiki/Spectral_density#Explanation" title="Spectral density">dBm/Hz</a> <ul><li><a href="/wiki/Spectral_density#Power_spectral_density" title="Spectral density">PSD</a></li></ul></li> <li><a href="/wiki/A-weighting#Environmental_noise_measurement" title="A-weighting">dBA</a></li> <li><a href="/wiki/DBZ_(meteorology)" title="DBZ (meteorology)">dBZ</a> (radar)</li> <li><a href="/wiki/Decibel#Radar" title="Decibel">dBsm</a></li> <li><a href="/wiki/DBc" title="DBc">dBc</a></li> <li><a href="/wiki/Decibel#Antenna_measurements" title="Decibel">dBi</a></li> <li><a href="/wiki/DBFS" title="DBFS">dBFS</a></li> <li><a href="/wiki/DBrn" title="DBrn">dBrn</a></li> <li><a href="/wiki/Decibel#Other_measurements" title="Decibel">dB-Hz</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <dl><dt>See also</dt> <dd><a href="/wiki/Logarithmic_unit" class="mw-redirect" title="Logarithmic unit">logarithmic unit</a></dd> <dd><a href="/wiki/Link_budget" title="Link budget">link budget</a></dd> <dd><a href="/wiki/Signal_noise" class="mw-redirect" title="Signal noise">signal noise</a></dd> <dd><a href="/wiki/Telecommunications" title="Telecommunications">telecommunications</a></dd></dl> </div></td></tr></tbody></table></div>    </div><noscript><img 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