[USRP-users] TwinRx not recieving waveform

Derek Kozel derek.kozel at ettus.com
Tue Jul 18 11:17:45 EDT 2017


Hi Bradon,

The TwinRX should show up as a TwinRX in the RX slot and an unknown
daughterboard in the TX slot. This is a cosmetic issue which we're aware of.

It is possible that you have a revision B TwinRX which has a newer ID than
is supported by your version of UHD. Can you please post the full output of
uhd_usrp_probe? This will have the UHD version information as well as info
on how the daughterboard is identifying.

Since you have installed UHD and GNU Radio many times it sounds like you
may have multiple, potentially conflicting versions installed. It is very
likely that you will need to uninstall all but one of these and get back to
a clean and consistent state. A good place to start there is to check the
outputs of

gnuradio-config-info --prefix -v
uhd_config_info --print-all

and the version string of UHD printed when you run a GNU Radio application.

Clearly we can see that uhd_fft for instance is installed in two places:
/home/wireless/target/bin/uhd_fft
/usr/local/bin/uhd_fft

You can try running `which gnuradio-companion` and `which uhd_usrp_probe`
to see if your paths make sense.

You can run `git describe` in your UHD source trees to see if they are
correctly in a uhd 3.10.x release. If possible it makes sense to update to
the latest stable release, currently 3.10.1.1.

Regards,
Derek


On Tue, Jul 18, 2017 at 3:59 PM, Brandon Dunn <bdunn5945 at yahoo.com> wrote:

> Hi Derek,
> GNUradio starts but the tones(900Mhz and 900.4Mhz) being created by the
> signal generators does not show up where it should near the center
> frequency set(898Mhz). The flow chart works for other radios but this
> twinRx board doesn't want to work. The file I am talking about is the
> db_twinrx.cpp file under uhd/host/lib/usrp/dboard. uhd_usrp_probe runs
> correctly but it shows the board as "unknown" but the correct code is shown
> for the twinrx(x091 - something). I am seeing only noise and center
> frequency but I have increased the gain to 70 and it still showed the same.
> I believe the problem is that GNUradio and UHD has been installed many
> times on the computer i am using with both pybombs and
> gnuradio/build(another method). I can't seem to run uhd_fft as it can't
> find it. I am using ubuntu. When i try to locate uhd_fft i get the
> following.
>
> /home/wireless/Pictures/CPU% for uhd_fft at high sampling rate.png
> /home/wireless/gnuradio/build/gr-uhd/apps/uhd_fft.exe
> /home/wireless/gnuradio/gr-uhd/apps/uhd_fft
> /home/wireless/gnuradio/gr-uhd/apps/uhd_fft_wx
> /home/wireless/gnuradio/gr-uhd/examples/grc/uhd_fft.grc
> /home/wireless/pybombs/src/gnuradio/build/gr-uhd/apps/uhd_fft.exe
> /home/wireless/pybombs/src/gnuradio/gr-uhd/apps/uhd_fft
> /home/wireless/pybombs/src/gnuradio/gr-uhd/examples/grc/uhd_fft.grc
> /home/wireless/target/bin/uhd_fft
> /home/wireless/target/share/gnuradio/examples/uhd/uhd_fft.grc
> /usr/local/bin/uhd_fft
> /usr/local/share/gnuradio/examples/uhd/uhd_fft.grc
>
>
>
>
>
>
> On Tuesday, July 18, 2017 3:41 AM, Derek Kozel <derek.kozel at ettus.com>
> wrote:
>
>
> Hello Brandon,
>
> How did you install UHD and GNU Radio? When you say that the USRP is not
> receiving the waveform, do you see just noise or does the application not
> even start? What file was missing, there should definitely not be anything
> missing from those versions.
>
> I recommend ensuring that uhd_usrp_probe runs correctly and shows the X310
> and TwinRX, then try using uhd_fft which comes with GNU Radio to see a
> spectrum plot. If you are seeing only noise my guess is that you need to
> increase the receive gain. The TwinRX has a very large gain range. Starting
> around index 70 is usually good.
>
> uhd_fft --freq 2e9 --gain 70
>
> Regards,
> Derek
>
> On Mon, Jul 17, 2017 at 9:01 PM, Brandon Dunn via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
> Hello,
> I am fairly new to usrp's and i am having troubles getting a waveform from
> a x310 with one TwinRX daughterboard acting as a receiver. I am using 2
> signal generators to generate the waveform. My UHD version is
> 3.10.something (the newest auto-downloaded version). I am using GNU-radio
> to show this waveform which is version 3.7.11.1. I found that the TwinRX
> .cpp was not in the required folder so i downloaded that from github and
> put it in the correct folder. I don't see what I could be doing wrong. Can
> someone help me?
>
> Thanks,
> Brandon
>
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