Re: [Discuss-gnuradio] Strange "UUUU" pattern

Knowing the code, zooming in shouldn't really increase the
computational load significantly; a higher FFT length would do that!
On Fri, 2019-03-15 at 15:34 +0000, Chesir, Aaron M. wrote:
> Folks,
>
> I found the error: The "U" characters indicated an underrun to my USRP transmitter. I reduced the sample rate form 5e6 to 2e6, and the underrun indicators went away.
>
> My problem in my receiver was that I was zoomed in to much in frequency span in my FFT display to see that I was indeed receiving my signal.
>
> Aaron
>
>
> From: Chesir, Aaron M.
> Sent: Friday, March 15, 2019 10:21 AM
> To: discuss-gnuradio@gnu.org
> Subject: Strange "UUUU" pattern
>
> Folks,
>
> I have a simple QPSK modulator feeding its output into the input of my USRP transmitter. I notice two oddities:
> The status window at the bottom produces a sequence of "U" characters until I stop the run, and
> The receiver does not detect any presence of any signal (I have a receive process on another computer feeding the output of the RTL SDR to an FFT, and is attached to this email)
>
> When I replace the QPSK modulator at my transmitter with a simple cosine generator, the receiver shows the presence of the signal with no problem, and I don't see those strange "U" characters at the source GRC process.
>
> Can someone offer suggestions at what I should fix?
>
> Thanks,
>
> Aaron
>
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