Chinese CODAN intruding into the 40m band

[VK2CSW]

I am not sure this helps anyone:

From:
http://www.lucabarbi.it/product/hoka-ele...codan.html

CODAN CHIRP decoder: measures the real center frequency of the transmitting station and tunes the data decoder automatically, and decode the ALE part of the transmission.

CODAN DATA decoder: is a QPSK scheme it uses 16 in-band tones from 656.25 Hz to 2343.75 Hz, spaced 112.5 Hz apart. These centre frequencies are derived from a 600 Hz to 2400 Hz frequency spread and 112.5 Hz per Quaternary Phase Shift Keyed (QPSK) channel.

Also:
http://www.wavecom.ch/content/ext/Monito...ndatam.htm

and

https://www.sigidwiki.com/wiki/Codan_Data_Modem