yoseph1998:
Although wouldn't mean the current draw would always be high (eating away precious battery life)?
How long does a fencing match last? A pair of AA alkaline cells will power an Atmega 328 with an nRF24 for several hours - like maybe 20 hours. Compared to the cost of fencing gear I suspect cheap alkaline cells are a trivial expense.
What about this. Using two transceiver chips on the master board that listen to each slave separately. That way it can still be time stamped to help synchronize but also eliminate the constant pulling.
You would probably need to disable auto acknowledgements to prevent the two "receivers" from interfering with each other and that would likely make the system less reliable as the slaves could not be sure that their message was received.
If the only purpose of this is to reduce the cost of batteries I don't see the point. Keep it simple.
...R