K4MT/NT9P network, also known as Enigma designator M42b, is a quite common Russian Intel/Diplo network which uses both CW-Morse and FSK 50Bd/500.
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| Fig. 1 |
In this recording, FSK follows a CW call "NT9P NT9P NT9P DE K4MT K4MT K" and in turn it's followed by a "CFM QRU K" request: most likely the CW is used for setup or operators chat. The FSK is a Baudot 5FG coded stream using a preamble and 7-bit period (fig. 2):
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| Fig. 2 |
note the markers at every group of 50 x 5FGs (Fig. 3):
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| Fig. 3 |
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