Continuous wave: Difference between revisions
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"In common usage and practice, C-W designates radiotelegraphy transmission using an unmodulated R-F carrier wave, turned on and off with a telegraph key to form the dits and dahs of Morse code. The 13-series transmitters were originally designed for voice operation only. The one aboard NR16020 was modified for C-W operation, primarily because of the requirement to operate on 500 KHz. This involved two major changes: alteration to the control circuitry; and the addition of a keying relay." | "In common usage and practice, C-W designates radiotelegraphy transmission using an unmodulated R-F carrier wave, turned on and off with a telegraph key to form the dits and dahs of Morse code. The 13-series transmitters were originally designed for voice operation only. The one aboard NR16020 was modified for C-W operation, primarily because of the requirement to operate on 500 KHz. This involved two major changes: alteration to the control circuitry; and the addition of a keying relay." | ||
{| border=1 cellpadding=5 | |||
|+'''Classification of transmission modes''' | |||
|- | |||
|A1 | |||
|'''Continuous wave (CW)''' | |||
|- | |||
|A2 | |||
|[[Modified continuous wave]] (MCW) | |||
|- | |||
|A3 | |||
|radiotelephone; voice | |||
|} | |||
== Related articles == | == Related articles == | ||
Revision as of 04:10, 24 February 2009
Abbreviated "CW" or "C-W".
"A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency. ... Continuous-wave radio was called radiotelegraphy because like the telegraph, it worked by means of a simple switch to transmit Morse code. However, instead of controlling the electricity in a cross-country wire, the switch controlled the power sent to a radio transmitter. This mode is still in common use by amateur radio operators."[1]
In the discussion of the final flight, references to CW effectively mean "Morse code communications."
"In common usage and practice, C-W designates radiotelegraphy transmission using an unmodulated R-F carrier wave, turned on and off with a telegraph key to form the dits and dahs of Morse code. The 13-series transmitters were originally designed for voice operation only. The one aboard NR16020 was modified for C-W operation, primarily because of the requirement to operate on 500 KHz. This involved two major changes: alteration to the control circuitry; and the addition of a keying relay."
| A1 | Continuous wave (CW) |
| A2 | Modified continuous wave (MCW) |
| A3 | radiotelephone; voice |