Antenna connection 3G modems [closed]
Solution 1:
It look like diagnostc connector. Then to use it as external antenna connector you possibly must cut internal antenna. After this modification it can't work without external antenna.
Think about reflector (usually grid antenna) antenna where you install modem itself in antenna focus. Like this - http://www.clearchain.com/blog/posts/improving-3g-mobile-broadband-reception-without-an-antenna It work with any modem. In this case You don't need to modify modem. Only restriction is usb cable length. But using long antenna cable also not good (mostly bad).
Solution 2:
It looks like a U.FL connectors - they're commonly seen on embedded wi-fi cards in laptops etc. If it were me, I'd be looking to take an internal antenna out of a laptop with the connector intact, and then modifying it.
http://en.wikipedia.org/wiki/IPX_connector
