How can I measure LTEM TX power after the antenna impedance matching circuit

Hello,

I’m currently working with a custom board based on the nRF9160 SiP, and I would like to measure the LTE-M TX power after the antenna impedance matching circuit. Ideally, I’d like to perform this measurement using an nRF9160 DK to help automate the RF testing process.

I’m aware that the %RFTEST TX AT command provides the transmitted power, but this measurement is taken at the antenna output, not after the matching circuit.

I was considering using the %RFTEST RX command on the development kit to capture the transmitted signal from the custom board. However, from my understanding, direct communication between two nRF9160 devices in this context is not supported.

Is there a recommended way to measure the TX power after the impedance matching circuit using a development kit, or any other method you suggest for automating this measurement?

Thank you in advance for your help!

Best regards,

Parents Reply
  • Thank you, Carla.

    What was the reasoning behind adding that matching network, with those specific values?

    As can be read in the PS, the ANT pin is already matched to 50 ohms. Your connector, differently from what would be the case if it were an antenna, likely has an impedance of 50 ohms as well. This is also the reason why the nRF9160 DK has a matching network for the antenna but not for the connector.

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