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At what point in the nRF24L01+ timing diagram does radio transmission begin?

I am working on a multi-node network application with multiple transmitters and receivers and I have a question about timing for chips like the nRF24L01+. I would like to know how close together two broadcasts from different transmitters can be made.

When I switch a chip to transmit I see there is a 130μS PLL settling time. Is the chip transmitting in this time (so nothing else could broadcast at that time without interfering) or is the settling done before transmission starts (so another chip could broadcast while another was PLL settling)?

My packets are short so a lot of time is spent on PLL settling. If one transmitter could PLL settle while another one transmitted that would save time. I am not using acknowledgement packets or resending, and I'm aware I'll have to be careful about timing and clock synchronization to make this work, and that the two transmitters won't be able to receive from one another as they'll be in transmit mode :)

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