https://devzone.nordicsemi.com/f/nordic-q-a/66946/circuit-using-the-nrf8001-advertising-but-not-being-found-wrong-designI&#39;ve made a circuit using the NRF8001 but slightly deviating away from the original PCB example. I&#39;m getting the device to go into &quot;Advertising Started&quot; but I can&#39;t pick up anything on a phone scanner. I&#39;m using the 2450BM14A0002T Johanson Balun insteaden-USTelligent Community 13Mon, 12 Oct 2020 17:58:29 GMThttps://devzone.nordicsemi.com/thread/274430?ContentTypeID=1Mon, 12 Oct 2020 17:58:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7450ef4b-f314-4be0-951c-8096bb7ef45epolishdude20<p>Yeah that makes sense! I guess that&#39;s what I get for being greedy on saving space and following some random person&#39;s design on the internet :( Thanks for your help. This was gnawing away at me haha.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/274286?ContentTypeID=1Mon, 12 Oct 2020 11:34:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d2c777b2-145f-4bf1-85db-246d8d986a71ketiljo<p>The problem is the 16 MHz resonator. This has a total accuracy (tolerance and temperature) of +/- 0.8%. The nRF8001 needs a proper crystal with max +/-40 ppm tolerance. There&#39;s no way the radio can operate at the correct frequency with a resonator.&nbsp;</p><div style="clear:both;"></div>