Not able to work out the benchmark_tx

Hey everyone ,
im using a RFX2400 trying to workout benchmark_tx.py

here is what i get

./benchmark_tx.py --tx-subdev-spec=A --from-file=README --bitrate=500e3
–freq=2450e6 -v

gr_fir_fff: using SSE
bits per symbol = 1
Gaussian filter bt = 0.35
Using TX d’board A: Flex 2400 Tx MIMO B
Tx amplitude 12000
modulation: gmsk_mod
bitrate: 500kb/s
samples/symbol: 2
interp: 128
Tx Frequency: 2.45G

I choose the Readme file that was in the directory already but how can i
choose another file? does it need to be in a special format?

Can some1 tell me what is the vertical axis units of the oscilloscope.py

thanks alot for your time

ziad

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