soldering a sma to a usb dongle

Discussion in 'The Projects Forum' started by aac9876, Apr 24, 2010.

  1. aac9876

    Thread Starter Active Member

    Dec 9, 2006
    my evdo usb modem has a tiny antenna jack on the side. The adaptors fit poorly and are so loose that you can change the signal 12 dbm by wiggling it. Not good.
    I want to solder on a sma female and glue it permanently on the side of the USB modem.
    Then I wouldnt even need the adaptor, I could just plug in the antenna coax right into it and screw it in tight.
    You may have seen these adaptors. Is the middle pin hot or ground??? Do I solder the
    pins together and the outers together.??? I would make sure to break the circuit by sanding the pcb solder before I did this. The sma would be the ONLY antenna circuit....
    any clear pics on this somewhere..??? any info appreciated..
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    The outer is the shielding and is usually connected to ground.
  3. bertus


    Apr 5, 2008