https://devzone.nordicsemi.com/f/nordic-q-a/73458/dtm-parameters-channel-39Hi, I am configuring a test software to generate CW signals at channel 0, 19 and 39. Currently I&#39;m using the nRF52840dk, later a custom board. The channel number is calculated according to f=2402+n*2 MHz so I expect for n=39 2480 MHz. For n=38, Ien-USTelligent Community 13Tue, 06 Apr 2021 14:42:03 GMThttps://devzone.nordicsemi.com/thread/303232?ContentTypeID=1Tue, 06 Apr 2021 14:42:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd58dc2f-1eea-4869-86be-167199823559Kenneth<p>I suggest to check the content of the MODECNF0 register, there is a DTX field that should be set to Center:<br /><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html#register.MODECNF0">https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html#register.MODECNF0</a>&nbsp;</p><div style="clear:both;"></div>