Channel Group 1 - from channel #2 (432.425 MHz) - to channel #20 (432.875 MHz)Channel groups define one or more (sequential) channels, with a constant channel spacing between them. Channel groups can differ from each other in the radio configuration, where the differences can be configured with the "Channel group based properties" button.RAIL automatically detects when the channel change requires channel group change as well.See AN971 for detailed documentation.