Misplaced Pages

Modulated continuous wave: Difference between revisions

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Browse history interactively← Previous editNext edit →Content deleted Content addedVisualWikitext
Revision as of 19:13, 25 August 2008 editMm40 (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers10,258 editsm →See also: removing already-linked-to article← Previous edit Revision as of 20:56, 31 October 2008 edit undoNigelj (talk | contribs)Extended confirmed users, Pending changes reviewers, Rollbackers13,869 edits a liitle more about usageNext edit →
Line 1: Line 1:
{{Modulation techniques}} {{Modulation techniques}}
'''Modulated continuous wave''' is defined by the ] in 47 ] §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." '''Modulated continuous wave''' is defined by the ] in 47 ] §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 ] for a general explanation of these symbols.


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

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==

Revision as of 20:56, 31 October 2008

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
Stub icon

This article related to amateur radio is a stub. You can help Misplaced Pages by expanding it.

Categories: