https://devzone.nordicsemi.com/f/nordic-q-a/18004/combining-the-rf-circuitry-of-nrf52-dk-and-nrf51822-donglePlease find attached the screenshot of the schematic where i have combined the RF circuitry from the NRF52 DK and the NRF51822 dongle for a compact board development. . Is this schematic correct. Do i need to add the RF connector/switch provided inen-USTelligent Community 13Mon, 28 Nov 2016 12:21:38 GMThttps://devzone.nordicsemi.com/thread/69406?ContentTypeID=1Mon, 28 Nov 2016 12:21:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5899903-42fa-4dd3-a797-36ac931ef8e9Hung Bui<p>Hi Goku,</p> <p>The schematic looks fine. You don&#39;t need the RF connector if you don&#39;t need one. However the value of R6, C3, L1 won&#39;t be the same as on nRF51 dongle. You would need to tune the value to have optimized rf performance. If you don&#39;t have equipment to tune the PI network, you can go for another option is to have only one shunt component (says C3) and then a longer antenna length. Then you can try to tune the antenna by reducing the length. It&#39;s described <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.whitepapers/dita/whitepapers/pdflinks/nwp_017.html?cp=11_7">here</a> at 4.1</p> <p>The main point is to have 50Ohm antenna impedance before you connect to L1.</p><div style="clear:both;"></div>