6
RF measurements
The nRF52 DK is equipped with a small coaxial connector (J1) for conducting measurements of the RF
signal with a spectrum analyzer.
The connector is of SWF type (Murata part no. MM8130-2600) with an internal switch. By default, when
no cable is attached, the RF signal is routed to the onboard trace antenna.
A test probe is available (Murata part no. MXHS83QE3000) with a standard SMA connection on the other
end for connecting instruments (the test probe is not included with 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 nRF52832 SoC to the test probe.
Figure 25: Connecting a spectrum analyzer
The connector and test probe add loss to the RF signal. See the following table for more information.
Frequency (MHz) Loss (dB)
2440 1.0
4880 1.7
7320 2.6
Table 10: Typical loss in connector and test probe
4397_500
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