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Compatible sideband transmission
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<p>A Compatible sideband transmission, also known as <a href="/facts/Amplitude_modulation/3sTxsXk6">amplitude modulation</a> equivalent (AME) or <a href="/facts/Single_sideband/Cfuv9KX1">Single sideband</a> reduced-carrier (SSB-RC), is a type of <a href="/facts/Single_sideband/Cfuv9KX1">single sideband</a> <a href="/facts/Radio_frequency/aWku7h4R">RF</a> <a href="/facts/Modulation/aAXPjINv">modulation</a> in which the <a href="/facts/Carrier_signal/ae98pBlY">carrier</a> is deliberately reinserted at a lower level after its normal suppression to permit reception by conventional AM receivers. The general convention is to filter the lower-sideband, and communicate using only the upper-sideband and a partial carrier. </p><p> The benefits of compatible-sideband over conventional AM are increased <a href="/facts/Spectral_efficiency/GaePAvv9">spectral efficiency</a> due to a reduction in bandwidth of 50% as well as a decrease in wasted power. By using compatible sideband instead of AM, less RF power is required at the transmitter to transmit the same quality of signal the same distance. This results in compatible sideband being almost 100% power-efficient, where regular AM is comparably only 16% power-efficient (84% of RF power wasted). </p><p>This modulation was first used by <a href="/facts/Transmitter_Hamburg-Billstedt/JHMFu0zN">the first West-German longwave transmitter</a> between 1953 and 1962, which worked on 151 kHz and is currently mostly used in <a href="/facts/High_frequency/JmDJLR5I">high frequency</a> military communications. </p> <p> This article incorporates <a href="/facts/Copyright_status_of_works_by_the_federal_government_of_the_United_States/Q1jvr96g">public domain material</a> from <a 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="/facts/General_Services_Administration/Np3opv9x">General Services Administration</a>. Archived from <a href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22. (in support of <a href="/facts/MIL-STD-188/D5rsvdsW">MIL-STD-188</a>). </p>