Baudot code is still the common denominator of digital modes, but it is far from standardised itself. While many use the term Baudot Code, others use the term Murray Code. These two names acknowledge two important telegraph pioneers, both of whom made major contributions in this field, however the correct term is CCITT International Alphabet No. 2. The differences between in practical systems is apparent in the punctuation characters and would not be noticed between two operators unless they used punctuation such as ! : % @ etc. Baudot is sent at differing speeds in different areas. Most US operation is at 45.45 baud (a hangover from a speed limitation by the FCC of 60 wpm for any coded operation), at 45 baud in Europe, while all operation in New Zealand is at 50 baud (after a collective decision to standardise to the commercial speed). Nowadays, computers have almost completely taken over from the mechanical teleprinter, so baud rate changes are no longer the problem they once were.

Frequencies:

Radio Teletype. FSK signal. 5 Bit, 45.45 Baud. 60 WPM. 170 Hz-850 Hz Shift. Duty cycle 100% 1.8-1.84, 3.58-3.62, 7.04-7.10, 10.13-10.14, 14.07-14.1, 18.1-18.105, 21.070-21.100, 24.920-24.925, 28.070-28.150.