[Discuss-gnuradio] siggen.py transmission Error

i m trying to transmit simple sin wave to check my usrp transmission
reception .
when i run usrp_siggen.py -f 900M --> " Using TX d'board A: <none> " is
displayed on terminal.
when i run usrp_fft.py -f 900M --> Failed to set RF initial frequency is
displayed in " FFT GUI "+ " u0u0u0u0..... " is displayed in terminal.

i m using gnu radio 3.2.2
USRP1
D.Boards Flex900.
fujitsu core i7 (as i have read that u0u0u0u0 is due to low performance P.C
)
Need Your Help plz.

Regards
Bilal Nasir.



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