https://devzone.nordicsemi.com/f/nordic-q-a/29131/channel-interferenceI have a NRF52840 and wanted to know, how much of a signal gets into another channel in BLE. I am going to explain what I mean so there is no confusion :). The Bluetooth Channels are like following image shows: BLE channel So there are 40 channelen-USTelligent Community 13Fri, 01 Dec 2017 10:30:11 GMThttps://devzone.nordicsemi.com/thread/115723?ContentTypeID=1Fri, 01 Dec 2017 10:30:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f4a81bd1-b1dc-45e9-a385-a7559aa6af88J&#248;rn<p>Hello ock</p> <p>The lists you link to are the requirements for the receiver. They list the requirement for Carrier/Interference ratio, while maintaining a maximum bit error rate (BER) of 0.1%. If you look at the nRF52840 table 22.15.6 RX selectivity, our numbers are lower than the ones listed in the Bluetooth specification. This indicates our chip can handle worse C/I ratios than the requirement while maintaining a maximum BER of 0.1%.</p> <p>If you look at table 22.15.4 of the nRF52840 product specification you find the Transmitter specification. Here it is stated that the ratio between transmit power 1 MHz from the carrier is -23dB when compared to the output power of the carrier. Similarly for 2MHz from the carrier frequency it is listed as -50dB compared to the carrier output power. These numbers are for the 1Mb/s PHY.</p> <p>Considering each channel center frequency are 2 MHz apart, you could expect to see, in channel 19 and 21, a signal whose power is around -50dB compared to the output power in channel 20.</p> <p>Best regards</p> <p>Jørn Frøysa</p><div style="clear:both;"></div>