https://devzone.nordicsemi.com/f/nordic-q-a/55375/didn-t-change-the-length-of-radio-tx-by-increasing-payloadI have nrf52832 platform and my version of softDrive is (nRF5_SDK_15.3.0_59ac345). I red a lot of documents and tech support like these links but couldn&#39;t find my problem. https://devzone.nordicsemi.com/nordic/power https://devzone.nordicsemi.comen-USTelligent Community 13Mon, 09 Dec 2019 15:05:59 GMThttps://devzone.nordicsemi.com/thread/224505?ContentTypeID=1Mon, 09 Dec 2019 15:05:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef77e73b-95bf-4b23-a687-dbb07a59eb06Sigurd[quote user=""] I increased the payload more than 256(in my sdk it was 256 according to source code) the plot was crashed[/quote] <p>&nbsp;Note that the&nbsp;maximum MTU size is 247 (NRF_SDH_BLE_GATT_MAX_MTU_SIZE), and the max&nbsp;data length is 251(NRF_SDH_BLE_GAP_DATA_LENGTH). I believe the&nbsp;ble_app_uart example is the best example to use for testing this, and for sending payloads with different lengths(ble_nus_data_send() is used to send the data.)</p> [quote user=""]but neither length of Tx changed , nor number of spikes changed.[/quote] <p>&nbsp;What tools are you using to measure this ?</p><div style="clear:both;"></div>