https://devzone.nordicsemi.com/f/nordic-q-a/57810/2mbps-proprietary-modeHi, Is it possible to enable the transmission of 2 bytes of preamble and use the TIFS register to force a delay to transmission when in proprietary 2Mbps mode? Thanks, Paulen-USTelligent Community 13Fri, 14 Feb 2020 14:03:55 GMThttps://devzone.nordicsemi.com/thread/234438?ContentTypeID=1Fri, 14 Feb 2020 14:03:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b4cb03e-d816-4d71-bfd7-14cad01cb4fcAndreas<p>Hi,</p> <p>&nbsp;</p> <p>Following the preamble there is a minimum of 1 byte base address which you can not disable, but you can probably use this along with a 1 byte preamble to construct a &#39;2 byte preamble&#39;. Base 0xAA will give total 0xAAAA.</p> <p>TIFS should work with 2Mbps proprietary, but it is only qualified and verified for use with 1Mbps BLE mode, from the PS:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-c74f08d3abf04f63ad25c5b6a162b298/pastedimage1581689019661v1.png" alt=" " /></p> <p>&nbsp;</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>