https://devzone.nordicsemi.com/f/nordic-q-a/72694/nrf52840-bluetooth-low-energy-ansi-c63-27-compliance-testDo I need to carry out ANSI C63.27 regulatory test for coexistence of wireless communication that share the 2.45GHz band if we designed a custom PCB BLE antenna for NRF52840 ? Does NRF52840&#39;s BLE uses DSSS or FHSS frequency hopping scheme to accommodateen-USTelligent Community 13Mon, 15 Mar 2021 13:19:42 GMThttps://devzone.nordicsemi.com/thread/299802?ContentTypeID=1Mon, 15 Mar 2021 13:19:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:216117bf-963c-4b85-b45a-3ff1c0329f8cKaja<p>Hi,<br /><br />I don&#39;t belive this is something you have to test. Check with your test house.<br /><br /></p> <div> <div> <p>BLE is not to be considered FHSS.</p> <div></div> </div> </div> <div>Best regards,<br />Kaja</div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/299473?ContentTypeID=1Fri, 12 Mar 2021 13:08:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:196da32e-ebe2-4763-962d-0dcfb15943d6Kaja<p>Hi,<br /><br />I will get back to you on Monday.<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>