scopesink.py always performs autoranging, continually adjusting the gain on
the vertical axis to best fit the signal. This can be inconvenient;
sometimes we would prefer a fixed gain on the vertical axis.
Here is a revised scopesink with additional parameters to control refresh
rate, vertical and horizontal scales, and autorange.
http://staff.washington.edu/~jon/gr-osx/scopesink.html
That page also provides a revised usrp_oscope with additional options to
set the new scopesink arguments.
Jon Jacky
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