https://devzone.nordicsemi.com/f/nordic-q-a/122761/nrf54l15-dks-cannot-connect-with-each-otherHi I have two DKs, previously they work well, however, after I add the nRF21540 FEM on each DK, I always receive this in my central device: Whether the amplifier cause this problems? What is RF noise here? Could you give me some advice?en-USTelligent Community 13Wed, 09 Jul 2025 07:34:03 GMThttps://devzone.nordicsemi.com/thread/541878?ContentTypeID=1Wed, 09 Jul 2025 07:34:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5dc4c485-a93c-45bd-bd4f-bfa157bcc849Ziyao Zhou<p>After I reconnect all the components, error gone, thank you!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/541741?ContentTypeID=1Tue, 08 Jul 2025 08:40:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f33ca207-331b-4dd4-942a-9dd2fb4dd980Priyanka<p>Hi,</p> <p>Since you encounter these issues after incorporating the FEM, it is likely causing the issue. RF noise could be anything which causes a radio frequency interference, for eg, signal reflection, crosstalk, wrong antenna matching, or overamplification etc.</p> <p>Make sure you have configured the nRF21540 properly. Both in the dts and config.</p> <p>Also make sure that the antennas are properly connected, and the boards are a few meters apart etc.</p> <p>Regards,</p> <p>Priyanka</p><div style="clear:both;"></div>