https://devzone.nordicsemi.com/f/nordic-q-a/43403/using-ant-with-lfrcIn the NRF52-DK user guide, the following is stated: Important: When using ANT/ANT+, the 32.768 kHz crystal (X2) is required for correct operation. However, I could not find any mention of this in the S332 v2.0 SDS specification (the latest availableen-USTelligent Community 13Wed, 06 Feb 2019 14:40:12 GMThttps://devzone.nordicsemi.com/thread/169765?ContentTypeID=1Wed, 06 Feb 2019 14:40:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:36e96fc3-00c5-4491-939e-ba729d626f9fTurbo J<p>ANT+ 32kHz crystal accuray required: Better than (or equal to) 50 PPM.</p> <p>Calibrated LFRC accuracy: 250PPM (enough for Bluetooth LE).</p> <p></p> <p>Conclusion: May work in labratory environments, but will probably fail in the field. :-(</p><div style="clear:both;"></div>