On Wed, May 8, 2019 at 7:28 PM Michael Deacon via USRP-users < usrp-users@lists.ettus.com> wrote:
> Hello, > > > > I have a simple transmitter consisting of a file source connected to a > USRP sink (attached image radio.png). The file contains interleaved > floating point IQ representing a few seconds of LTE. The IQ amplitude > values are normalized between +1.0 and -1.0. The sink is configured to > 60db, 7.5MHz sample rate, 385MHz center frequency and 5MHz bandwidth. The > output looks exactly like the original on a spectrum analyzer (see attached > good.jpg). If I turn up the gain on the sink or increase the amplitude of > the IQ data I get what looks to be noise on either side of the signal > spectrum (see attached bad.jpg). Any idea what is going on here? > Your bad.jpg picture has the spectrum analyzer saying OLVD. Try changing your reference level of the spectrum analyzer to be higher so you don't saturate the input of the spectrum analyzer. Tell us if that fixes it for you. Brian
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