https://devzone.nordicsemi.com/f/nordic-q-a/20633/esb-peripheral-questionI have set up some code using the ESB example in SDK v12.2.0 I and am able to transmit and receive packets between two nrf51 dongles, with no issues. However, when I program a custom PCB that has a nrf51 with the same exact same code, it is not able toen-USTelligent Community 13Mon, 20 Mar 2017 15:07:53 GMThttps://devzone.nordicsemi.com/thread/80430?ContentTypeID=1Mon, 20 Mar 2017 15:07:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c7c3e6b-ef26-40cc-adba-ed32d81657adTgage<p><a href="https://devzone.nordicsemi.com/question/33972/use-external-32mhz-crystal/">devzone.nordicsemi.com/.../</a></p> <p>// Set the external high frequency clock source to 32 MHz NRF_CLOCK-&gt;XTALFREQ = 0xFFFFFF00;</p> <p>Had to set the nrf51 to use the 32 MHz crystal, now working with no issues.</p><div style="clear:both;"></div>