In manual radiotelegraphy the sending operator manipulates a switch called a telegraph key, which turns the radio transmitter on and off, producing pulses of unmodulated carrier wave of different lengths called "dots" and "dashes", which encode characters of text in Morse code. At the receiving location, Morse code is audible in the receiver's earphone or speaker as a sequence of buzzes or beeps, which is translated back to text by an operator who knows Morse code. With automatic radiotelegraphy teleprinters at both ends use a code such as the International Telegraph Alphabet No. 2 and produced typed text.
in manual radiotelegraphy the sending operator manipulates a switch called a telegraph key which turns the radio transmitter on and off producing pulses of unmodulated carrier wave of different lengths called "dots" and "dashes" which encode characters of text in morse code at the receiving location morse code is audible in the receiver's earphone or speaker as a sequence of buzzes or beeps which is translated back to text by an operator who knows morse code with automatic radiotelegraphy teleprinters at both ends use a code such as the international telegraph alphabet no 2 and produced typed text