https://devzone.nordicsemi.com/f/nordic-q-a/446/why-rf-frequency-unstable-under-cw-testWe are developing a USB ANT dongle with nRF24AP2-USB chipset, but we meet a problem when use CW test with ATWareII tool. We set 2.466GHZ, but we see 2.271GHZ mark, but we set 2.466GHz again, we see2.353GHZ mark point set 2.466GHz again, the ouputen-USTelligent Community 13Fri, 13 Sep 2013 01:37:35 GMThttps://devzone.nordicsemi.com/thread/2312?ContentTypeID=1Fri, 13 Sep 2013 01:37:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2213e95f-b18e-4e6a-84f4-cf9fea72bb6dsteven.zdwang<p>Hi Kenneth, I used ANTwareII to do CW test. I found it do ANT_ResetSystem and then do CW test. So I think the ANTWareII CW Test function works fine. The problem root cause maybe in PCB layout, we make this RF production first, could you give us suggestion or checklist for it. Thank you!</p> <p>Attached ANTWareII CW test function picture.</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/cw_5F00_test.JPG">cw_test.JPG</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/2311?ContentTypeID=1Wed, 11 Sep 2013 10:30:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03eab8e5-cac0-46c1-86b6-8d1cd6d622b9Kenneth<p>The ANT_InitCWTestMode() command should be executed only directly after a reset, or a System Reset command. Failure to do so may result in unpredictable results. To reset the nRF24AP2-USB you can use the ANT_ResetSystem().</p><div style="clear:both;"></div>