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.

[PaKa]

Which FEM are you using and are you sure it is configured correctly?

[skylu@telit]

we use RFX2401C.

the FEM should have configured correctly. because with FWM device and SCAN and connection other BLE devices 

 

here is the DTS 

&radio {
fem = <&nrf_radio_fem>;
};

/ {
nrf_radio_fem: rfx2401c_fem {
compatible = "skyworks,rfx2401c", "radio-fem-two-ctrl-pins";

/* TXEN -> P1.10 ; RXEN -> P0.01 */
ctx-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
crx-gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;

ctx-settle-time-us = <1>;
crx-settle-time-us = <1>;

tx-gain-db = <25>;
rx-gain-db = <12>;
};
};

here is the config

# MPSL + FEM simple GPIO control

CONFIG_MPSL=y

CONFIG_MPSL_FEM=y

CONFIG_MPSL_FEM_SIMPLE_GPIO=y