I have just upgraded from GNU Radio 3.1 to 3.2. At the same time I
upgraded from Ubuntu 8.04 to Ubuntu 9.04. The hardware setup is a USRP1
with an LFTX daughterboard.
Under the previous setup (8.04+3.1), I could generate signals with an
amplitude up to approx 1V. Above that the signal was severely distorted,
which fits very well with what I’ve been able to read about the
With the new setup (9.04+3.2), the same code generates signals with an
amplitude of approx 0.28V, and above that the signal again is severely
This bugs me. The hardware should definitely still be able to produce 1V
amplitude. I have tried this with two different USRPs and two different
daughterboards and also with two host computers.
Before I do any more debugging and start producing a small enough
example, let me ask: Has there been any changes from 3.1 to 3.2 that
could explain this behaviour?
Universitetslektor (Associate Professor)