apologize for my English
made a link on the cards r52Hn with channel width 20 with a single antenna. connected at a speed of 65Mb. but to my knowledge the speed should be around 130Mb. so I used Google and found that the reason is that the card supports only MCS0 MCS7 from which the rate depends. but also found that the other cards supports MCS15 that gives them the speed of 130Mb.
if I'm right, then why do these cards do not support MCS15?
and another question
found that MCS7 speed can be not only 65Mb but 72.2Mb, but it depends on what Guard Interva - 400 or 800. where in mikrotik this setting can edit?