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[Discuss-gnuradio] found problem with std_4rx_0tx.rbf
From: |
Hans Glitsch |
Subject: |
[Discuss-gnuradio] found problem with std_4rx_0tx.rbf |
Date: |
Tue, 23 Oct 2007 17:16:14 -0700 |
Hi,
There's a problem with the std_4rx_0tx.rbf in the latest release. This
problem did not exist in 3.0.
Please see the attached image. All four inputs should look exactly the
same, but there is something wrong with input 0. It could be that the
imaginary part of the input 0 signal is getting suppressed. I don't know.
Here's what I did: I have a brand new usrp with two basic rx boards. I
connected a signal generator to a four way splitter and then connected the
four way splitter directly to the four usrp inputs. The signal generator
was set to 480khz at -17 dbm. Then I executed "multi_fft.py -d 100 -f
500000 -g 0". The attached screen shot shows the problem with input 0. If
I move the signal generator to 520khz, the reflection moves to the other
side of zero freq. If I swap cables on input 0 and input 1, the problem
stays with input 0.
Thanks for your help,
Hans
Screenshot-Multi Scope-2.png
Description: PNG image
- [Discuss-gnuradio] found problem with std_4rx_0tx.rbf,
Hans Glitsch <=
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Eric Blossom, 2007/10/23
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Hans Glitsch, 2007/10/23
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Eric Blossom, 2007/10/23
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Hans Glitsch, 2007/10/24
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Eric Blossom, 2007/10/24
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Johnathan Corgan, 2007/10/24
- Re: [Discuss-gnuradio] found problem with std_4rx_0tx.rbf, Hans Glitsch, 2007/10/24
- [Discuss-gnuradio] Buliding GNU Radio on Gentoo Linux, Simon Alford, 2007/10/25
- Re: [Discuss-gnuradio] Buliding GNU Radio on Gentoo Linux, George Nychis, 2007/10/25
- RE: [Discuss-gnuradio] Buliding GNU Radio on Gentoo Linux, Simon Alford, 2007/10/26