how to set a fixed frequency to NRF51822https://devzone.nordicsemi.com/f/nordic-q-a/14587/how-to-set-a-fixed-frequency-to-nrf51822I want to test the Bluetooth signal performance of NRF51822 with frequency spectrograph,but Idon&#39;t know how to set a fixed frequency to NRF51822,I need your help thank youen-USTelligent Community 13Sun, 19 Jun 2016 09:17:58 GMTRE: how to set a fixed frequency to NRF51822https://devzone.nordicsemi.com/thread/55688?ContentTypeID=1Sun, 19 Jun 2016 09:17:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eb574a3b-d382-43be-bd81-a913dccfd3c5Jui-Chou (Rick) Chung<p>The Direct Test Mode (DTM) can help you tes the RF signal performance.</p> <p>The reference information can be found in <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk51.v10.0.0/ble_sdk_app_dtm_serial.html?cp=5_0_1_4_4">here</a> and <a href="http://infocenter.nordicsemi.com/pdf/nan_34.pdf">here</a>.</p> <p>If you are using nRF5 SDK 11, you can check the example project under:</p> <pre><code>nRF5_SDK_11/examples/dtm/direct_test_mode/pca10028 </code></pre> <p>And using the nRFgo Studio to send the control signal through the UART and emit the RF signal in specific RF channel. Hope the upon information can help you : )</p><div style="clear:both;"></div>