Hi, Paulina, That spectrum has way too much structure in it. Something is not working right. I'm not that familiar with tut3, but if there is a way to get a snapshot of samples from the ADC it would be good to verify whether the data from the ADC looks reasonable. Like most systems, the PFB is GIGO (garbage in, garbage out) so it's good to verify that what's going on is not garbage.
HTH, Dave > On Nov 10, 2016, at 09:36, Paulina Unanue <unanu...@gmail.com> wrote: > > > Hi all > > i'm working with the Tutorial 3: Wideband Spectrometer, with ROACH 1, i'm > using a signal generation to feed the ADC(2x1000-8 sintonize at 1 GHz) with a > tone (-40 dbm 200 MHz) but i'm obtaining a high noise floor,i had reduced > the gain > as recommended in the instructions ( "decrease the value (for a -10dBm input > 0x100) to not saturate the spectrum" ) trying different values, but the same > problem persists. Any idea that may be causing this?. > > To see the graphic, please check the attached. > best wishes > > <graf.jpg>
