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| fig.1 |
CIS 3x100 waveform consists of three FSK2 channels modulated at 100Bd and a pilot tone
at ~3300 Hz (characteristic feature of Russian systems). Every channel
has a 1440 Hz shift and 100 Baud speed, channels are separated by 480Hz
steps (figs. 2,3) and interleaved as in fig.1
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| fig. 2 - 1440 Hz shift |
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| fig. 3 - channel separation |
The 100 symbols/sec modulation rate, is obtained by highlighting a single channel in the FFT and measuring its speed (fig. 4).
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| fig.4 |
update
in this post it has been verified that the system carries up to tree T207/CIS-14 channels for a total of six independent 5-bit channels.
https://yadi.sk/d/SlYz9x6JllZhDg
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