Modulated continuous wave

Modulated continuous wave
Passband modulation v · d · e
Analog modulation
AM · SSB · QAM · FM · PM · SM
Digital modulation
FSK · MFSK · ASK · OOK · PSK · QAM
MSK · CPM · PPM · TCM · SC-FDE
Spread spectrum
CSS · DSSS · FHSS · THSS
See also: Demodulation, modem,
line coding, PAM, PWM, PCM

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


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • frequency-modulated continuous-wave radar — nuolat spinduliuojantis moduliuotojo dažnio radaras statusas T sritis radioelektronika atitikmenys: angl. FM continuous wave radar; frequency modulated continuous wave radar vok. frequenzmoduliertes Dauerstrichradar, n rus. частотно… …   Radioelektronikos terminų žodynas

  • Continuous-wave radar — is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects.[1]Continuous wave (CW) radar uses Doppler, which renders the radar immune to interference from… …   Wikipedia

  • Continuous wave — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • continuous wave radar — A radar that radiates continuously. Such a radar has two aerials one for radiation of electromagnetic energy and one for its reception. For range measurement, the transmitted carrier is progressively frequency modulated, and the received… …   Aviation dictionary

  • FM continuous-wave radar — nuolat spinduliuojantis moduliuotojo dažnio radaras statusas T sritis radioelektronika atitikmenys: angl. FM continuous wave radar; frequency modulated continuous wave radar vok. frequenzmoduliertes Dauerstrichradar, n rus. частотно… …   Radioelektronikos terminų žodynas

  • continuous wave — Telecommunications. an electromagnetic wave of constant amplitude and frequency: used to carry information by being modulated, as in radio or television, or by being interrupted as in radiotelegraphy. Abbr.: CW [1910 15] * * * …   Universalium

  • continuous wave — Telecommunications. an electromagnetic wave of constant amplitude and frequency: used to carry information by being modulated, as in radio or television, or by being interrupted as in radiotelegraphy. Abbr.: CW [1910 15] …   Useful english dictionary

  • Wave radar — Ocean surface waves can be measured by several radar remote sensing techniques. Several instruments based on a variety of different concepts and techniques are available to the user and these are all often called wave radars. This article (see… …   Wikipedia

  • Wave — A wave is a disturbance that propagates through space and time, usually with transference of energy. While a mechanical wave exists in a medium (which on deformation is capable of producing elastic restoring forces), waves of electromagnetic… …   Wikipedia

  • continuous waves — noun plural 1. : radio waves that continue with unchanging intensity or amplitude without modulation and that are used in telegraphy in which the wave is turned on and off with a key to form the dots and dashes of a code continuous wave… …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”