I got a Navcode data decoder Navtex-unit. Unfortunately there was only the display and antenna in a plastic bag, so I have no any kind of manual for this. I guessed that black and red are for power and the unit starts nicely.
So now I have 8 cable ends and two of them are for the antenna, but which ones? Picking up randomly 2 from 8, when the order matters, gives you 56 combinations. So if anyone knows which ones are for the antenna, it would be really awesome.