https://devzone.nordicsemi.com/f/nordic-q-a/57893/using-radio-without-external-32mhz-clockHi, I have read that using the external 32MHz crystal is mandatory for proper BLE radio operation. However, is there any internal clock that could be used instead of the external just for checking BLE as beacon availability? We have ordered theen-USTelligent Community 13Mon, 17 Feb 2020 11:30:12 GMThttps://devzone.nordicsemi.com/thread/234615?ContentTypeID=1Mon, 17 Feb 2020 11:30:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81240562-8a14-4853-9948-a37d13bf22ebSylvio<p>Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/234611?ContentTypeID=1Mon, 17 Feb 2020 11:10:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:601fe83e-c995-4a03-a894-303141d9fd16Dmitry<p>Hi,</p> <p>BLE functionality requires clock source with 40ppm tolerance. An internal RC oscillator has up to 6% (60000ppm) tolerance, it definitely cannot be used for BLE.</p><div style="clear:both;"></div>