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Revision as of 22:19, 31 October 2008 editAndrewHowse (talk | contribs)Autopatrolled, Pending changes reviewers, Rollbackers37,750 editsm Disambiguate AM to Amplitude modulation using popups← Previous edit Revision as of 18:15, 8 June 2009 edit undoDebresser (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers, Template editors110,467 editsm accessdate parameter fix using AWBNext edit →
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MCW is not allowed in the United States on ] frequencies lower than ], as it is a very inefficient use of radio spectrum. MCW is not allowed in the United States on ] frequencies lower than ], as it is a very inefficient use of radio spectrum.


==See also== == See also ==
*] * ]


==References== == References ==


*{{cite web | title = Amateur Radio Service Definitions (47 CFR §97.3) | work = | url = http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=47&PART=97&SECTION=3&TYPE=TEXT | accessmonthday = August 3 | accessyear = 2005 }} * {{cite web | title = Amateur Radio Service Definitions (47 CFR §97.3) | work = | url = http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=47&PART=97&SECTION=3&TYPE=TEXT | accessdate = August 3, 2005 }}


*{{cite web | title = Ham Radio Jargon, Abbreviations and Terminology | work = | url = http://www.ac6v.com/jargon.htm | accessmonthday = August 3 | accessyear = 2005 }} * {{cite web | title = Ham Radio Jargon, Abbreviations and Terminology | work = | url = http://www.ac6v.com/jargon.htm | accessdate = August 3, 2005 }}


{{Morse code}} {{Morse code}}

Revision as of 18:15, 8 June 2009

Passband modulation
Analog modulation
Digital modulation
Hierarchical modulation
Spread spectrum
See also

Modulated continuous wave is defined by the Federal Communications Commission in 47 CFR §97.3(c)(4) as "Tone-modulated international Morse code telegraphy emissions having designators with A, C, D, F, G, H or R as the first symbol; 2 as the second symbol; A or B as the third symbol." See Types of radio emissions for a general explanation of these symbols.

Simply put, MCW uses a fixed audio tone to modulate a carrier wave. This is an older method of sending Morse code, with continuous wave being the more common method used today.

Unlike A1A CW transmissions, A2A MCW morse can clearly be heard on a normal AM radio receiver. It was commonly used by many RDF beacons to send a morse station identifier on a regular basis.

MCW is not allowed in the United States on amateur radio frequencies lower than 50 MHz, as it is a very inefficient use of radio spectrum.

See also

References

International Morse code
Transmission methods
Notable signals
Other writing systems
in Morse code
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