Re: [Discuss-gnuradio] error msg of hardware not supporting the requested RX frequency

[Derek Kozel]

Hello Vinit,

This question is much more about UHD so I'm adding the usrp-users mailing list [1].

There is no USRP daughterboard which goes to 250 GHz so I assume you mean 250 MHz which would point towards the BasicRx daughterboard. This daughterboard has no mixer and so the N200 will use aliasing to receive non-baseband signals. The N200's ADC runs at 100 MSPS, but Gigabit Ethernet isn't able to transport that much data so it is always decimated by some factor. This means that a target frequency of 97.9 MHz (A good choice for a first test) is in a higher Nyquist band. What you're seeing is correct behaviour.

UHD 3.5.5 is very old and I'd recommend removing the current version and install a newer release. I would guess that you are on Ubuntu 14.04 and installed it using apt. If you are very unfamiliar with Linux and don't have anyone locally who you could get some assistance from it's worth considering using the GNU Radio Live Environment [2] which can be written to a USB drive and booted from. This comes with up to date versions of GNU Radio and UHD, as well as a variety of additional SDR related packages.

You can also look at PyBOMBS[3] or the build-gnuradio [4] script, either of which will install the latest UHD and GNU Radio.

Regards,

Derek

[1] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[2] https://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioLiveDVD
[3] https://github.com/gnuradio/pybombs/
[4] https://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGRFromSource#Using-the-build-gnuradio-script

On Fri, Apr 8, 2016 at 1:12 PM, Vinit Shah <address@hidden> wrote:

Dear all,
I am a beginner in Linux and So far I have successfully installed gnuradio and hardware dependencies.

The very basic program which is just connecting usrp source with WX gui fft sink is not working correctly.

I am getting following error messaege

linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.005.005-0-unknown

Using Volk machine: sse4_2_64_orc
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes

UHD Warning:
    Unable to set the thread priority. Performance may be negatively affected.
    Please see the general application notes in the manual for instructions.
    EnvironmentError: OSError: error in pthread_setschedparam

UHD Warning:
    The hardware does not support the requested RX frequency:
    Target frequency: 97.900000 MHz
    Actual frequency: -2.100000 MHz

>>> Done

My daughter board has range up to 250 Gigs... but I do not know why even with 10 M sampling frequency my system is aliasing ??

This is a common problem I found on internet but no effective solution so far, I think.

Any help would be highly appreciated.

I request you please explain explicitly because I am novice in this field( with linux), and if possible with example..??

Thank you very much in advance

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