RF measurements

The nRF54LM20 DK is equipped with a small coaxial connector (J1) to measure the RF signal with a spectrum analyzer.

The connector is an SWF type (Murata part no. MM8130-2600) with an internal switch. By default, when a cable is not attached, the RF signal is routed to the onboard trace antenna.

In this example, a test probe (Murata part no. MXHS83QE3000) is used with a standard SubMiniature Version A (SMA) connection on the other end for connecting instruments. The test probe is not included in the kit. When connecting the test probe, the internal switch in the SWF connector disconnects the onboard antenna and connects the RF signal from the nRF54LM20B SoC to the test probe.

The connector and test probe add loss to the RF signal. See the following table for more information or consult the test probe user guide if you are using another model.