Which mod changed the title of this thread? Are we sure the OP wasn't talking about PSK as in Pulk Specjalny Komandosow?
Sorry Harry, that would be me.
I looked up what it was, so that everyone would understand what the OP was referring to. Guess there's more than one definition of PSK then?
Please could you clarify the meaning of PSK, so that posters are able to help you, thanks.