https://devzone.nordicsemi.com/f/nordic-q-a/67388/nrf52833---phase-based-distance-measurement-feasibleOur group is trying to use the NRF52833DK do phase-based distance estimation as described in the attached paper. To do this we want to transmit packets with constant tone extensions at different frequencies and look at the way the phase of received CTEen-USTelligent Community 13Tue, 20 Oct 2020 16:07:20 GMThttps://devzone.nordicsemi.com/thread/276007?ContentTypeID=1Tue, 20 Oct 2020 16:07:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7badd0b4-3d10-4bcb-a55c-d0ca544ec878Kenneth[quote user=""]We have had trouble doing so and we think this is because each time we change the frequency, the radio must be disabled and re-enabled and the phase of carrier waveforms is not preserved.[/quote] <p>I can see this may be a problem yes, but unfortunately I am not aware of any other suggestion that try the different radio&nbsp;features in the datasheet:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52833/radio.html">https://infocenter.nordicsemi.com/topic/ps_nrf52833/radio.html</a></p> <p>Maybe enabling shortcut between PHYEND event and START task can improve the situation? Since&nbsp;PHYEND is generated when the last bit is sent on air (or in case of RX: The last bit on air is received), while END event is related to byte received/fetched from RAM. You may also try Fast mode in MODECNF0 in case that is better (40us instead of 150us).</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>