Does any one know which is the MAIN connector on the R52n-M radio the PDF on the radio does not have it noted also?

J4 is main. As a general rule, the connector with the lower number on the radio card is main.

Tom

The same thought had occurred to me. Will Mikrotik replace the card if I blow it up because I followed what someone told me was the general rule and it didn't?

I'm glad to see MMCX becoming the 'general rule' of connectors because the sooner U.Fl. is consigned to the history of really, really bad design concepts (I'll bet the idiots who thought that one up never tried using their baby in a harness at the top of a mast in half-a-gale), we the people who actually have to use them do appreciate having them clearly marked.

So all laptop manufacturers will have to stop using uFL? Somehow I don't think so!

So all laptop manufacturers will have to stop using uFL? Somehow I don't think so!

laptop is not carrier class equipment. you don't need to replace the cards often, or change antennas. laptop has to be small, that's the only requirement.