Problem in executing benchmark_tx.py

Hi,

I am trying to run benchmark_tx.py with USRP1 from one PC, and receiving
data with another USRP1 from another PC, with this some .dat files are
getting generated with some junk data.
My approach:
At TX PC: ./benchmark_tx.py --modulation=gmsk --size=1500
–megabytes=1.0 --from-file=payload.dat --freq=423e6 --bitrate=500000
–tx-subdev-spec=A --tx-amplitude=12000

At RX PC: ./benchmark_rx.py --modulation=gmsk --freq=423e6
–bitrate=500000 --rx-subdev-spec=A

Can anyone tell me what is wrong in my approach, (why junk data is
getting written) and how to resolve this issue.

Thanks,
Ashwini