https://devzone.nordicsemi.com/f/nordic-q-a/37651/question-regarding-crystalHello Nordic Team I am working on Raytac MDBT42V – 512K module. In this module doesn&#39;t have external crystal. So according to Raytac spec, it recommend to use internal 32MHz crystal. When I am downloading any nRF52 application it doesn&#39;t broadcasten-USTelligent Community 13Tue, 21 Aug 2018 08:07:03 GMThttps://devzone.nordicsemi.com/thread/145049?ContentTypeID=1Tue, 21 Aug 2018 08:07:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0473dd6-10e9-42ec-a93c-b0e48ad5455aAndreas<p>Hi,</p> <p>&nbsp;</p> <p>Any application requiring the radio to be used must use a 32 MHz crystal. This should be present on the module so you do not have to add one externally to the crystal.</p> <p>&nbsp;</p> <p>To verify if the radio is running or not you should try to set up a TX carrier, e.g. by using the attached hex file. You do not need a spectrum analyzer, just measure the current.</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-d3309bf0c9f9410b86dd3bd87620cef7/nrf52_5F00_unmod_5F00_ch40_5F00_sleep.hex">devzone.nordicsemi.com/.../nrf52_5F00_unmod_5F00_ch40_5F00_sleep.hex</a></p> <p>&nbsp;</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>