Search results
Results from the WOW.Com Content Network
Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy.
An operator uses the telegraph key to send electrical pulses (or in the case of modern CW, unmodulated radio waves) of two different lengths: short pulses, called dots or dits, and longer pulses, called dashes or dahs. These pulses encode the letters and other characters that spell out the message.
These silent periods provide the sending operator with opportunities to listen for interruptions from receiving stations. Whereas in usual CW operation the sending carrier wave is always on, and only gated to the antenna, in QSK operation the antenna is switched to receiver status on the off-time between dits and dahs, and then switched right back.
The different length pulses of carrier, called "dots" and "dashes" or "dits" and "dahs", are produced by the operator switching the transmitter on and off rapidly using a switch called a telegraph key. The first type of transmission was generated using a spark, since the spark fired at around 1000 times a second (when the telegraph key was ...
He doesn’t talk much; he prefers the dits and dahs to communicate. By 8:30 p.m. he has corresponded with six other operators in various countries. U-R-N-A-M-E, Lee asks a contact in Bulgaria.
1911 Chart of the Standard American Morse Characters. American Morse Code — also known as Railroad Morse—is the latter-day name for the original version of the Morse Code developed in the mid-1840s, by Samuel Morse and Alfred Vail for their electric telegraph.
In Gerke's system there are only "dits" and "dahs", the latter being three times as long as the former, and the internal silence intervals are always a single dit-time each. This improved code was adopted by the Deutsch-Oesterreichischer Telegraphenverein in 1851 and by the International Telegraph Union in 1865 (in slightly modified form) as ...
Other visual mnemonic systems have been created for Morse code, mapping the elements of the Morse code characters onto pictures for easy memorization. For instance, "R" ( ) might be represented as a "racecar" seen in a profile view, with the two wheels of the racecar being the dits and the body being the dah.