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Revision as of 18:15, 8 June 2009 editDebresser (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers, Template editors110,467 editsm accessdate parameter fix using AWB← Previous edit Revision as of 21:20, 11 September 2011 edit undoSparkgap (talk | contribs)Extended confirmed users2,621 edits F2A is often used by automaticly controlled stations for identification.Next edit →
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Simply put, MCW uses a fixed audio tone to modulate a ]. This is an older method of sending ], with ] being the more common method used today. Simply put, MCW uses a fixed audio tone to modulate a ]. This is an older method of sending ], with ] being the more common method used today.


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


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.

F2A MCW morse can be heard on a normal ] radio receiver, and it is commonly used by both commercial and amateur ] stations for ]. Also, F2A is sometimes by other types of stations operating under automatic control, such as a ] transmitter or a ].


== See also == == See also ==

Revision as of 21:20, 11 September 2011

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 50.1 MHz, as it is a very inefficient use of radio spectrum.

F2A MCW morse can be heard on a normal FM radio receiver, and it is commonly used by both commercial and amateur repeater stations for identification. Also, F2A is sometimes by other types of stations operating under automatic control, such as a telemetry transmitter or a remote base station.

See also

References

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