Benchmark_tx and UHD

it is far from trivial to make the benchmark_tx example in
/gnuradio-examples/python/digital work with the UHD. I know that the
input of the USRP1 is traditionally in the range [-32k,+32k] and in
[-1,+1] for the UHD driver. I thought putting a constant multiplier
between the transmit-path and the usrp would suffice but it doesn’t.
First the output of the transmit-path is in the range [-0.25,+0.25]
which confuses me because this is far too low for the traditional

I attached the file I modified. Help appreciated
for solving this little mystery.

Best Regards,

P.S.: the benchmark_rx works fine with UHD

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