Hi Rolando, This sort of channel number offset issue usually indicates a misalignment between the sync pulse in the design and data where your data goes through an operation that has some latency, and this latency isn't compensated for in the sync signal. One clue is that there is usually a spike in FFT bin 0 (i.e., the DC bin). In your plots this spike appears at the end of the spectrum for the per-antenna plots, and seemingly at bin ~2 in the beamformer plot.
You should fix this in your simulink design, by adding or removing latency in the sync or data signals to keep them aligned. You could just shift your spectra in software, but that's a bit of a hack -- really you should just fix the hardware bug. Cheers Jack On Sat, 10 Mar 2018 at 15:54 Rolando Paz <[email protected]> wrote: > Hi Jack > > I did some tests with my beamformer design (4 inputs). > > Currently I only have a 70MHz test tone at the A and B inputs. I do not > have anything connected at C and D inputs . > > The tone at A and B inputs is slightly offset to the left with respect to > the 70MHz signal. > > In the C and D inputs appear some signals that I do not know why they > appear. > > Do you know why the spectrum can move? > > In the case of the beamformer signal, it appears displaced to the right of > the 70MHz tone. Why does this happen? > > Is this corrected in the spectrometer design (matlab design) or is it > corrected with python? > > Best Regards > > Rolando Paz > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
