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nrf24l01 rf_ch bits

I am confused by the channel bits in register 0x05.

why is there a '1' in bit 1. I guess it can't be used and so the range is

00000010   - 2400MHz

00000011  -  2401MHz

00000110 (6) - 2406MHz ??????

00000111 (7)

The datasheet says the freq range is 2400 to 2525MHz but it also says Freq = 2400 + RF_CH MHz

Which therefore makes the first channel (00000010) 2402MHz

help please

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