The nRF7002 Expansion Board (EB) is equipped with a small coaxial connector (J1) to measure RF signals from nRF7002 using a spectrum analyzer.
The connector is of Microwave coaxial connector with switch (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 chip antenna.
In this example, a test probe (Murata part no. MXHS83QE3000) is used with a standard SubMiniature Version A (SMA) connection for 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 nRF7002 EB to the test probe.
The connector and test probe add loss to the RF signal that should be taken into account when measuring. See the following table for more information or consult the test probe user guide if you are using another model.
| Frequency (MHz) | Loss (dB) |
|---|---|
| 2440 | 1.0 |
| 4880 | 1.7 |
| 7320 | 2.6 |