Try this setup published on my website.
http://www.wirelessinfo.be/index.php/li ... m-sxte.php
Reset the sxt's without default configuration.
Copy the code and paste this in the window "new terminal" in winbox.
Change country settings and distance. This example is a point to point configuration.
If you want two sxt clients connect with the accesspoint take the code 2 for client.
Edit the SSID to the ssid from your accespoint