816:
31:
343:
MCW can be generated by any AM or FM radio transmitter with audio input from an audio oscillator or equivalent audio source. When an SSB transmitter is modulated by Morse code of only a single audio frequency, the resulting radio frequency emission is J2A or J2B and therefore is CW by definition, not
455:§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." These symbols are defined by the
356:, with one channel containing digital information, and using a subcarrier, also known as A2A. For example, Morse code sent by in an AM broadcast by a commercial radio station would be modulated CW as it contains a subcarrier.
577:
313:
857:
410:
The FCC designates this mode as F2A: F (frequency modulation), 2 (one channel containing digital information, using a subcarrier), A (aural telegraphy).
277:
456:
363:. The symbols stand for: A (amplitude modulation), 2 (one channel containing digital information, using a subcarrier), A (aural telegraphy).
644:
369:
Amateur radio operators may also use A2A to transmit Morse code, however it would be more typical to send it as CW, rather than MCW, using
306:
222:
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785:
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763:
748:
448:
360:
201:
850:
95:
881:
282:
196:
168:
135:
110:
62:
299:
340:
Continuous wave (CW), by contrast, does not use a subcarrier, so there is no emission at all between Morse code symbols.
886:
843:
452:
384:
Unlike A1A CW transmissions (double sideband, with no subcarrier), A2A MCW will produce an audible audio tone from an
373:
with a suppressed carrier, which reduces the bandwidth and power requirements. The FCC designates this mode as either
100:
370:
252:
72:
413:
F2A MCW Morse can be heard on a normal FM radio receiver, and it is commonly used by both commercial and amateur
125:
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728:
637:
533:
438:
262:
145:
723:
528:
159:
795:
392:
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105:
90:
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191:
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421:. Also, F2A is sometimes used by other types of stations operating under automatic control, such as a
718:
667:
404:
353:
115:
52:
47:
462:
All
Modulated CW (MCW) emission types listed by the FCC (all are one channel and use a subcarrier):
876:
758:
630:
426:
140:
773:
469:
173:
150:
130:
672:
538:
120:
366:
Single-sideband modulation with full carrier (H2A/H2B) is another form of modulated CW (MCW).
827:
459:. The FCC classifies International Morse code telegraphy emissions as "digital information".
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247:
242:
67:
57:
30:
677:
385:
182:
414:
870:
823:
578:
U. S. Code of
Federal Regulations, Title 47, Chapter 1, Subchapter D, Part 97.3(c)(1)
444:
388:
radio receiver that is not equipped with a beat oscillator. MCW is commonly used by
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227:
206:
692:
790:
687:
653:
523:
330:
81:
38:
22:
422:
418:
232:
622:
513:
Single-sideband with reduced or variable carrier, no subcarrier (R1A, R1B)
494:
All CW emission types (not MCW), listed by the FCC (all are one channel):
466:
Double-sideband amplitude modulation (A2A, A2B) – e.g. AM broadcast radio
19:
557:
An MCW Keyer for V/UHR FM (N. Wilford, W1TLZ), QST April 2013, pp. 37-38
504:
Single-sideband modulation with full carrier, no subcarrier (H1A, H1B)
738:
733:
510:
Single-sideband with suppressed carrier, with subcarrier (J2A, J2B)
237:
607:
507:
Single-sideband with suppressed carrier, no subcarrier (J1A, J1B)
626:
713:
708:
498:
Double-sideband amplitude modulation, no subcarrier (A1A, A1B)
490:
Single-sideband with reduced or variable carrier (R2A, R2B).
478:
Frequency modulation (F2A, F2B) — e.g. FM broadcast radio
333:
telegraphy transmitted using an audio tone to modulate a
377:(J2A) if intended to be decoded by ear, or otherwise as
831:
487:
Single-sideband modulation with full carrier (H2A, H2B)
352:
MCW on AM would typically be sent as double-sideband
747:
701:
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381:(J2B), if it's intended to be decoded by machine).
589:"Amateur Radio Service Definitions (47 CFR §97.3)"
604:"Ham Radio Jargon, Abbreviations and Terminology"
851:
638:
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8:
501:Vestigial sideband, no subcarrier (C1A, C1B)
858:
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645:
631:
623:
314:
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15:
475:Combination of AM and FM or PM (D2A, D2B)
451:defines modulated continuous wave in 47
550:
214:
181:
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80:
37:
18:
457:International Telecommunication Union
403:When Morse code is transmitted using
7:
812:
810:
395:to transmit the station identifier.
359:This mode is designated A2A by the
830:. You can help Knowledge (XXG) by
14:
449:Federal Communications Commission
361:Federal Communications Commission
814:
29:
433:Classification and other forms
1:
407:(FM), it is a form of MCW.
903:
809:
436:
371:single-sideband modulation
223:Capacity-approaching codes
683:Modulated continuous wave
399:Frequency Modulation (FM)
348:Amplitude Modulation (AM)
327:Modulated continuous wave
822:This article related to
729:Morse code abbreviations
654:International Morse code
534:Types of radio emissions
439:Types of radio emissions
724:Prosigns for Morse code
529:Prosigns for Morse code
160:Hierarchical modulation
882:Radio modulation modes
796:Chinese telegraph code
749:Other writing systems
610:on September 19, 2017
379:electronic telegraphy
719:Morse code mnemonics
668:Electrical telegraph
661:Transmission methods
405:frequency modulation
354:amplitude modulation
887:Amateur radio stubs
759:American Morse code
427:remote base station
567:PicoKeyer-Plus Kit
470:Vestigial sideband
82:Digital modulation
839:
838:
804:
803:
425:transmitter or a
324:
323:
39:Analog modulation
894:
860:
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818:
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647:
640:
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619:
617:
615:
606:. Archived from
599:
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482:Phase modulation
375:aural telegraphy
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309:
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16:
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867:
866:
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807:
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769:Cyrillic script
750:
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702:Notable signals
697:
678:Continuous wave
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183:Spread spectrum
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764:Greek alphabet
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437:Main article:
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419:identification
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2:
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824:amateur radio
820:
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786:Arabic script
784:
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781:Hebrew script
779:
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772:
771:
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765:
762:
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751:in Morse code
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673:On–off keying
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659:
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539:On–off keying
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445:United States
440:
432:
430:
428:
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420:
417:stations for
416:
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364:
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40:
36:
32:
28:
27:
24:
21:
17:
832:expanding it
821:
806:
682:
612:. Retrieved
608:the original
592:. Retrieved
573:
562:
553:
493:
461:
442:
412:
409:
402:
383:
378:
374:
368:
365:
358:
351:
342:
339:
335:carrier wave
326:
325:
288:Multiplexing
228:Demodulation
693:Signal lamp
233:Line coding
877:Morse code
871:Categories
791:Wabun code
688:Heliograph
545:References
524:Morse code
472:(C2A, C2B)
331:Morse code
23:modulation
614:August 3,
594:August 3,
423:telemetry
329:(MCW) is
518:See also
415:repeater
215:See also
20:Passband
774:Russian
443:In the
393:beacons
739:Z code
734:Q code
447:, the
141:SC-FDE
826:is a
484:(G2B)
344:MCW.
238:Modem
828:stub
616:2005
596:2005
278:OFDM
207:THSS
202:FHSS
197:DSSS
111:MFSK
96:APSK
714:CQD
709:SOS
453:CFR
390:RDF
283:FDM
273:ΔΣM
268:PWM
263:PDM
258:PCM
253:PAM
248:PoM
243:AnM
192:CSS
174:WDM
169:QAM
151:WDM
146:TCM
136:QAM
131:PSK
126:PPM
121:OOK
116:MSK
106:FSK
101:CPM
91:ASK
73:SSB
63:QAM
873::
429:.
386:AM
337:.
68:SM
58:PM
53:FM
48:AM
859:e
852:t
845:v
834:.
646:e
639:t
632:v
618:.
598:.
315:e
308:t
301:v
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
