https://devzone.nordicsemi.com/f/nordic-q-a/57447/nrf52840-with-pa-in-arduinoHello, currently im using feather nrf52840 board in arduino environment. I made some tests with BLE with TX power at 8 dBm and when boards are at line of sight signal is good but i have to put my boards in plastic boxes and boards sits in different roomsen-USTelligent Community 13Sat, 08 Feb 2020 09:48:10 GMThttps://devzone.nordicsemi.com/thread/233395?ContentTypeID=1Sat, 08 Feb 2020 09:48:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c2d1ff5-4e54-44d8-bcb8-43dcf67ba194KAMEN<p>that cleared up the error im getting. without pa lna i think long range mode would help the issues im having but its not implemented yet so i will try with pa and see how it goes thanks for the reply.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/233315?ContentTypeID=1Fri, 07 Feb 2020 14:06:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0521a280-4006-46ce-a2da-3bc4ec5222e9Simonr<p>Hi</p> <p>How are these two boxes communicating, using BLE or some proprietary 802.15.4 radio protocol? Depending on how far away from each other these devices will be, and how much interference, etc. there is in the environment, I think that an LNA/PA shouldn&#39;t be necessary for BLE at least.</p> <p>The reason you get the <em>ret_code_t not declared&nbsp;</em>error is because you haven&#39;t included the header file where it is declared in your project. I believe this should be in the sdk_errors.h file, so please include that directory to your project.</p> <p>Please also note that more than 10dBm for any radio is not legal to use commercially in Europe for any radio, so I assume this is just your personal hobby project.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>