The "Unperforated tape" character is obtained through the ASCII valor CHR(1).
Small characters are transformed in capital characters and special characters as « é » are transformed in standard capital (in the example: « E »). The RTTY 45 bauds, shift 23 Hz MSK mode, from MMTTY, has been created by Makoto Mori, JE3HHT around 2003.Ĭharacter set :ITA2 (32 letters and 32 figures) without error correction character (« fixed length » characters). The demodulation is not done with two filters (as in FSK) but is done using phase measures. Note: in RTTY 45 bauds, shift=23 Hz, the modulation is specific and called "MSK" (Minimum Shift Keying).
Modulation : FSK two tones (« mark » and « space », "mark" high) with a shift between tones of 23 Hz, 170 Hz (standard shift), 200 Hz or 850 Hz,
A character is composed of a « start » bit (1 « space »), 5 bits and a « stop » bit (1.5 « mark »)
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