Hi...
I need to make one p2p link, and on one side I have PC with latest rotuer OS, and there I would put R52n-M. On other side I would put 711G-5HnD. Can I use this setup to connect that with 1 antenna on each side with 40 mhz channels (I suppose I cannot use a turbo, but 5 ghz N with 40 mhz channels?).

Thank you

Yes - why not? 5Ghz-only-N 20/40Mhz HT Above and u are good to go. Only remember to have max throughput its recommended to uz di-pole antennas (with regular antenna u will be able to run onlu chain0 so Air rate 150/150Mbps at ideal environment.