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Continuous Wave for nRF9160

jlienau03

Is there any test firmware available (or reference code) for doing total radiated power measurements?  I have the nRF9160 designed onto a PCB and we'd like to do some antenna measurements. Ideally I'd be able to put the nRF9160 into a continuous wave mode.

Thanks!

Johnny

  • 0 in reply to Håkon Alseth

    Ok thanks, I have it working now on the development kit.  I'm able to send AT commands from a terminal program directly to the nRF9160.  Your example code worked great (I used P0.10, 11, 12, and 13).

    One last question, since this all began with me trying to do a Continuous Wave... when I try to send the AT command to do a CW I get an error back saying it 'Failed.'  I get this error both for my modified code above, or if I'm using the original code and the nRF Connect Link Monitor program to send the command.  Additionally, it doesn't seem like any of the RF test AT commands are working.  I tried to do RX as well but that didn't work.  I've copied a picture of the failure from the nRF Connect Link Monitor program below.

  • 0 in reply to jlienau03

    Hi,

     

    Try to reset the board, not input any other AT command than this one:

    %RFTEST=2,1,0

    This should do a GPS SNR test, and provide something like this:

    ***** Booting Zephyr OS v1.13.99-ncs2 *****
The AT host sample started
AT%XRFTEST=2,1,0
%XRFTEST: -103
OK

    Do note that you shall not test any TX without placing the device into a shielded box. This is a restricted and licensed band!

    Kind regards,

    Håkon

  • 0 in reply to Håkon Alseth

    I still get the same error following your instructions.  He's a picture again, along with the output log from the nRF Connect terminal.

    /cfs-file/__key/communityserver-discussions-components-files/4/2019_2D00_03_2D00_07T14_5F00_21_5F00_18.546Z_2D00_log.txt

  • 0 in reply to jlienau03

    Hi Johnny,

     

    This one took a long time before I saw..

    I think you are missing an X in your command, it should be "AT%XRFTEST". Could you see if that one executes successfully?

     

    Kind regards,

    Håkon

  • 0 in reply to Håkon Alseth

    Awesome, you're right.  It works now.  I want to point out that some of the examples in the AT command reference document provided by Nordic omit the 'X' as well.  The picture below is from page 36 of the guide, which talks about the RF test commands.  This is probably where I got messed up.  The command is described correctly in the manual, but in the example code snippet there is no 'X.'  There are a few other examples like this too in the RF test section.

    I have one last question (hopefully). When I enter in an AT command for transmit I get a response from the module that is '%RFTEST: some number.'  According to the AT manual, dividing 'some number' by 16 is supposed to give me the power at the antenna.  When I send TX commands, the reply telling me the TX power is always negative and in the hundreds (see the nRF Connect terminal output below).  This seems to imply my power is well below -30 dBm, which can't be correct.  Am I interpreting this right, or is something else wrong?  I'm using development kits right out of the box with no modifications to them.  

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