HI
We are currently manufacturing products using the nRF52832, but some receiver sensitivity issues have been reported and are currently under review.
1) Inspection methods during production
- Since we don't have specialized RF equipment, we build a separate nRF52832 receiver and test it using the dBm measurement.
Example: -40 dBm or higher is normal.
2) I measured the PCB that exhibited the issue in the above test (1) using the nRF Connect app on the same smartphone in the same location.
A difference of approximately -10dBm occurred (based on a normal PCB).
* Bad PCB : -50dBm
3) This time, I connected an SMA connector to the antenna front end, connected the PCB to the nRF52 DK board with an RF cable, and measured it using DTM and RSSI Viewer.
However, the PCB with the low measurement value in "1)" measured the same as the normal PCB. ( Use a 10dB attenuator in the middle )
* Bad and Normal PCB = -35dBm
In conclusion,
1) and 2) show differences when measured in air, but 3) shows no difference when connected via RF cable, which makes interpretation a bit confusing.
So, should I increase the measurement range for air conditions?
The loss seems quite high at -28dB. Could this be due to poor RF matching?
