OUT2 shows curious distortion - is my Red Pitaya broken?

Tell us how your experiment is running with Red Pitaya
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MarkO
Posts: 3
Joined: Fri Mar 04, 2016 12:50 pm

OUT2 shows curious distortion - is my Red Pitaya broken?

Post by MarkO » Tue Apr 05, 2016 11:20 am

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 :(
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pavel
Posts: 509
Joined: Sat May 23, 2015 5:22 pm

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

Post by pavel » Tue Apr 05, 2016 11:35 am

It still could be a bug in the SDR application.

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

MarkO
Posts: 3
Joined: Fri Mar 04, 2016 12:50 pm

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

Post by MarkO » Tue Apr 05, 2016 5:27 pm

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?
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MarkO
Posts: 3
Joined: Fri Mar 04, 2016 12:50 pm

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

Post by MarkO » Tue Apr 12, 2016 2:07 pm

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.

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