Morse Transmitter MG 23 (1950)

These devices were mainly used for learning and exercising the Morse code. The Morse transmitter sends the Morse codes punched into a Wheatstone paper tape over a transmission line or over a radio channel to a receiver which records the transmitted Morse codes.

The holes punched into the tape are sensed by feeler levers, which close an electric contact when they sense a hole. By means of a relay circuit it is detected, whether the two holes are one above the other or are separated by one position. Correspondingly a short or long sound signal is sent on the line. The transmission speed can be adjusted between 60

 Kulturdenkmal SH en


to 220 characters per minute. In addition, the pause between the characters can be adjusted
up to 7 times the normal length, so that it is made easy for beginners to learn the Morse codes,
when they listen tothem by means of an earphone or a loudspeaker. Since only the pause is
made longer and not the timing of dots and dashes within a character, the sound impression
of a character does not change.

The Morse transmitter was not only used for learning and exercising, but also for regular trans-
missions of text messages. Transmitting the characters by means of a Wheatstone paper tape
is faster and smoother than manually transmitting by operating a Morse key.

  Demonstration of the morse devices