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External Antenna for MRD2EVM

Juan M. Lopez
Prodigy 30 points
Other Parts Discussed in Thread: MRD2EVM

I have already bought MRD2EVM evaluation kit and I want to connect an etxernal antenna. Can anyone confirm that what I have to do is just cut the pads in SJ1 and SJ2 and then connect my antenna to the connector close to it?

Another issue: I can't find SJ3 connector; where is it? 

Last: where can I find documentation about the purpose of SWITCH1?

Best regards,

  • 0
    TI__Mastermind 38660 points

    Hi Juan,

    Correct, disconnect SJ1 and SJ2 to remove the onboard antenna and connect your 47uH antenna coil to the header. 

    Good question!  I don't see SJ3 on the board either.  Let me look into this.

    Have a look at the MRD2 Reference Guide(the module, not the EVM).  This switch allows you to change the status of the WLS, CRDM, and RDEN- pins.  Section 4.2.3 of the reference guide shows the description of each pin. 

    MRD2 Reference Guide: http://www.ti.com/lit/pdf/scbu049

  • 0 in reply to Eddie LaCost
    TI__Mastermind 18265 points

    Hi Juan,

    the SJ3 is not so easy to find because it is covered by a sticker at the buttom of the EVM module.

    This Jumper is only needed if you want to supply the module not from the USB port but from an external supply.

     

    Best regards,

    Helfried Vollbrecht