This is an old revision of this page, as edited by 2A4Fh56OSA (talk | contribs) at 16:36, 20 May 2013 (Added MCW information for amateur radio.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 16:36, 20 May 2013 by 2A4Fh56OSA (talk | contribs) (Added MCW information for amateur radio.)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)| 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 can be transmitted from any common amateur radio transceiver using a tone oscillator. MCW is not allowed in the United States on amateur radio frequencies lower than 50.1 MHz, between 144.0 and 144.1 MHz, or between 219 and 220 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 used by other types of stations operating under automatic control, such as a telemetry transmitter or a remote base station.
See also
References
- An MCW Keyer for V/UHR FM (N. Wilford, W1TLZ), QST April 20913, p37-38
- PicoKeyer-Plus Kit http://www.hamgadgets.com/index.php?main_page=product_info&products_id=89
- CW With Your H-T (Donald J. DuBon, N6JRL): http://www.af2cw.com/cw/CW%20With%20Your%20HT.pdf
- "Amateur Radio Service Definitions (47 CFR §97.3)". Retrieved August 3, 2005.
- "Ham Radio Jargon, Abbreviations and Terminology". Retrieved August 3, 2005.
| International Morse code | |
|---|---|
| Transmission methods | |
| Notable signals | |
| Other writing systems in Morse code | |
 | This article related to amateur radio is a stub. You can help Misplaced Pages by expanding it. |