In turn these are represented on the radio signal by a shift between two frequencies, one frequency signifying a mark or high voltage and another frequency representing a space of a low voltage.
![rtty sound rtty sound](https://moonrakeronline.com/media/catalog/product/cache/37f56071fde1a5564b53c2d99849b9ee/m/f/mfj-462b.jpg)
#Rtty sound code
The code representing the letters consists of a series of bits represented by high and low voltages. RTTY uses a form of transmission known as frequency shift keying. However with the arrival of computers and their greater level of flexibility and sophistication, other more efficient types of digimode are available but despite this, the amateur RTTY is still widely used. In the early days of the use of RTTY, large mechanical teleprinters were used to print the data, but now with the ease of use of computers, these are used to decode and decipher the RTTY transmissions because they are quieter, smaller, more convenient and more efficient. Once surplus equipment started to become available, radio amateurs started to use RTTY, and it soon became popular. RTTY was widely used for commercial applications where it enabled printed messages to be sent quickly and without the need for a trained Morse operator. The first form of data transmission or digimode to gain widespread acceptance was known as radio teletype or RTTY.
![rtty sound rtty sound](https://image2.slideserve.com/3853424/digital-modes-l.jpg)
See also: Digimodes summary AMTOR RTTY PSK31 Packet radio PACTOR WSJT WSPR
![rtty sound rtty sound](https://qrznow.com/wp-content/uploads/2019/12/SDC.jpg)
What is RTTY for amateur radio - An overview, summary or tutorial about the basics of RTTY or Radio Teletype, one of the first "digimodes" to be used and the RTTY frequencies used by radio amateurs.