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From: | Chesir, Aaron M. |
Subject: | Re: [Discuss-gnuradio] Strange "UUUU" pattern |
Date: | Fri, 15 Mar 2019 15:34:23 +0000 |
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. Folks, I have a simple QPSK modulator feeding its output into the input of my USRP transmitter. I notice two oddities:
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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