Editing Compatible sideband transmission

{{Short description|Type of sideband modulation}}

A '''Compatible sideband transmission''', also known as '''[[amplitude modulation]] equivalent''' (AME) or '''[[Single sideband]]''' reduced-carrier (SSB-RC), is a type of [[single sideband]] [[Radio frequency|RF]] [[modulation]] in which the [[carrier signal|carrier]] 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. <ref name="Greene1973">{{cite book|author=Frank M. Greene|title=Technical Terms and Definitions Used with Law Enforcement Communications Equipment: (radio Antennas, Transmitters and Receivers)|url=https://books.google.com/books?id=I_laL8UIPnoC&pg=PA110|year=1973|publisher=National Institute of Law Enforcement and Criminal Justice|pages=110–}}</ref>


The benefits of compatible-sideband over conventional AM are increased [[spectral efficiency]] 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).  <ref>{{Cite web | url=http://www.radio-electronics.com/info/rf-technology-design/am-amplitude-modulation/efficiency.php |title = Amplitude Modulation Efficiency: AM Efficiency » Electronics Notes}}</ref>

This modulation was first used by [[Transmitter Hamburg-Billstedt#History|the first West-German longwave transmitter]] between 1953 and 1962, which worked on 151&nbsp;kHz and is currently mostly used in [[high frequency]] military communications.

==References==
{{reflist}}
{{FS1037C MS188}}

[[Category:Radio modulation modes]]


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