Need to measure the RF power( continuous unmodulated signal) of our custom board

[sunaina]

We need to measure the RF power(continuous unmodulated signal) of our custom board based on nrf5340 using spectrum analyzer. please suggest the steps and tools to perform the mentioned test.

[Priyanka]

Hi,

Please make sure that your custom board has an RF test point similar to the nRF5340 DK, which uses a small coaxial connector (SWF type, Murata MM8130-2600). This allows you to connect a test probe (Murata MXHS83QE3000) with an SMA connector to your spectrum analyzer. When the test probe is connected, the onboard antenna is disconnected, and the RF signal is routed to the probe.

https://docs.nordicsemi.com/bundle/ug_nrf5340_dk/page/UG/dk/hw_rf_measure.html 

Program your board with the Radio test sample . This allows you to configure the radio to output a continuous unmodulated carrier, which is suitable for RF power measurements and certification testing.

Attach the test probe to the RF test point on your board and connect the SMA end to your spectrum analyzer. Use a terminal emulator (e.g., PuTTY) to connect to your board’s UART interface. You can make use of the CLI commands provided by the radio test firmware. On the spectrum analyzer, observe and measure the output power at the set frequency.

-Priyanka