https://devzone.nordicsemi.com/f/nordic-q-a/66475/nrf52833-to-nrf52811Hi I currently have a nRF52833 DK which I am using as a transmitter. I also have a custom board with a nRF52811 SoC with an antenna array to act as the receiver for AoA. I previously had an antenna array attached to a nRF52833 DK which acted asen-USTelligent Community 13Wed, 30 Sep 2020 12:32:18 GMThttps://devzone.nordicsemi.com/thread/272306?ContentTypeID=1Wed, 30 Sep 2020 12:32:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65356314-5a61-4d21-863e-e28b04fdd4b4Marjeris Romero<p>Hi Sid,</p> <p>Can you check that you are using the right start-up files for the nRF52811?</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/3835.pastedimage1601468777500v1.jpeg" alt=" " /></p> <p>You can also check that the preprocessor flag NRF52811_XXAA i set in the Preprocessor definitions:</p> <p><br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/6153.pastedimage1601468898210v2.png" alt=" " /></p> <p><br />You could also send your HW files to us so we can review your custom board. You could for instance check you are using the right values for the crystal capacitors based on the load capacitance given by the datasheet of the crystal. The formula for calculating the crystal capacitor values is:</p> <p>C= 2 * CL - 4pF</p> <p>Best regards,</p> <p>Marjeris</p><div style="clear:both;"></div>