FEM issue

[skylu@telit]

Our device is using NRF54L15 for BLE function.
When we test the max distance of ble connection between 2 devices, we get the below results.

We are confused by these results.
Shall not the result with FEM and higher Tx power be better than the one without FEM and lower Tx power.
Do you have any idea about what is the potential cause for these results.

[stak]

Hi,

I’m still looking into the issue, but one thing worth checking is whether your nRF54L15 is affected by this Errata: https://docs.nordicsemi.com/r/bundle/errata_nrf54l15_rev1/page/err/nrf54l15/rev1/latest/config_l15_56.html. (Check your revision) The errata specifically applies to the nRF54L15 and describes an issue with external FEM/PA operation, which can degrade range.

There may also be some impact from interference in the test environment, or other explanations, but I would recommend reviewing the errata and trying the proposed workaround as a starting point.

Stine