Continuous wave: Difference between revisions
No edit summary |
No edit summary |
||
| Line 17: | Line 17: | ||
|- | |- | ||
|A3 | |A3 | ||
|radiotelephone | |[[Voice Modulation]], radiotelephone | ||
|} | |} | ||
== Related articles == | == Related articles == | ||
Revision as of 19:58, 6 October 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 | Modulated continuous wave (MCW) |
| A3 | Voice Modulation, radiotelephone |