Hello. What is the best setting for nRF24l01+ register (I mean "RF_SETUP" register) for highest board and less collision. Thanks.
The altitude of the board can not be adjusted by this register. ;) The register controls the bitrate and power only.
Higher bitrates give less collisions with same amount of data. Higher bitrates work over shorter distances. Too much power can overwhelm a receiver on short distances.
So it depends on your setup/application.
If 2Mbps with 0dBm works, I would use it.