cloudatlas13:
The receiver needs to change the frequency in order to avoid collision of data. As all the the devices will be transmiting at the same time, I thought the best way is using different frequencies for each device and reconfigure the receiver on execution time.
This sounds like poor system design - perhaps due to lack of understanding of the nRF24 capabilities.
If you provide all the details of what you want to achieve (with numbers) it will be easier (i.e. not impossible) to give useful advice.
...R