nRF52 Preview DK v1.1.x

RF measurements

The nRF52 Preview Development Kit board is equipped with a small size coaxial connector (J1) for conducted measurements of the RF signal.

The connector is of SWF type from Murata (part no. MM8130-2600) with an internal switch. By default, when there is no cable attached, the RF signal is routed to the on-board PCB trace antenna.

A test probe is available from Murata (part no. MXHS83QE3000) with a standard SMA connection on the other end for connecting instruments. When connecting the test probe, the internal switch in the SWF connector will disconnect the PCB antenna and connect the RF signal from the nRF52832 device to the test probe.

Figure 1. Connecting a spectrum analyzer

The connector and test probe will add loss to the RF signal which should be taken into account when doing measurements, see Table 1.

Table 1. Typical loss in connector and test probe
Frequency (MHz) Loss (dB)
2440 1.0
4880 1.7
7320 2.6

Documentation feedback | Developer Zone | Subscribe | Updated 2017-02-16