5 June 2017

CIS Makhovik ("The flywheel") before CIS-12

CIS Makhovik ("The flywheel") is classified as "vocoder" but can be used also for sending encrypted data. It was originally designed to operate in the UHF but very often is found on the HF as a waveform of the AT-3004D/AT-3104D modem. In this ample (Figure 1) is possible to see the switch from the flywheel to CIS-12 waveform. The flywheel modulation can be QPSK, MSK, and PSK-2 as in this sample (speed is 1200 Baud).

Fig. 1
Fig. 1 - 425.8 msec period

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