NRF with multiple transmitters - IMU units

Whandall:
And what is the output of the sending station?

Now is working. Apparently the problem is with the TX, I am using an adafruit pro trinket 3V.
I just did a quick test with two Arduino UNOs and I read the following on the RX.

received a packet on pipe 4 # 11 tStamp 11000
received a packet on pipe 5 # 12 tStamp 12000
received a packet on pipe 0 # 13 tStamp 13000
received a packet on pipe 1 # 14 tStamp 14000
received a packet on pipe 2 # 15 tStamp 15000
received a packet on pipe 3 # 16 tStamp 16000
received a packet on pipe 4 # 17 tStamp 17000
received a packet on pipe 5 # 18 tStamp 18000
received a packet on pipe 0 # 1 tStamp 1000
received a packet on pipe 1 # 2 tStamp 2000
received a packet on pipe 2 # 3 tStamp 3000
received a packet on pipe 3 # 4 tStamp 4000
received a packet on pipe 4 # 5 tStamp 5000
received a packet on pipe 5 # 6 tStamp 6000
received a packet on pipe 0 # 7 tStamp 7000

Now I will try my code with UNO and see if it works...