Page 1 of 1

OUT2 shows curious distortion - is my Red Pitaya broken?

Posted: Tue Apr 05, 2016 11:20 am
by MarkO
Hi,
my Red Pitaya shows curious distortion on my out2-HF-channel.
out1 is as I suggest - thats ok.
I am using Pavel Demin's SDR-transceiver to get the Red Pitaya interact with GNU Radio.

Does someone know what's going on here? Seems like the DAC of my Red Pitaya is broken.

Since this problem is as from beginning, i am wondering if i can get the board replaced :(

Re: OUT2 shows curious distortion - is my Red Pitaya broken?

Posted: Tue Apr 05, 2016 11:35 am
by pavel
It still could be a bug in the SDR application.

Could you please check OUT2 with the "Generator & Oscilloscope" application?

Re: OUT2 shows curious distortion - is my Red Pitaya broken?

Posted: Tue Apr 05, 2016 5:27 pm
by MarkO
You are right pavel.
A sine on OUT2 looks like it should with this application. Only at my first try both signals were distorted a little bit (tek0019.png). But i couldn't reproduce this. The following runs (also with 600 kHz for better comparison) looked really nice.

Is there any chance that you might improve the sdr-transceiver in this point?

Re: OUT2 shows curious distortion - is my Red Pitaya broken?

Posted: Tue Apr 12, 2016 2:07 pm
by MarkO
INFO:
Pavel did the same measurements as i did and sent me over his outcomes .. obviously the bug is somewhere in system, because his sine wave on out2 where clean of distortion.

If I can figure out the Problem, I will let you know here.