# Using uhd\_fft with USRP N210

**URL:** <https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/230189>\
**Category:** GNU Radio\
**Created:** [June 4, 2014, 10:42am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/230189 "2014-06-04T10:42:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 4, 2014, 10:42am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/230189/1 "2014-06-04T10:42:56Z")

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Hi,

I’m trying to run uhd\_fft with usrp N210, my machine run ubuntu desktop  
12.04.4 LTS.

When I try to run uhd\_fft which is located in  
/usr/local/src/gnuradio-3.7.2.1/gr-uhd/apps directory, i’ve got the  
following message:  
root@openlab:/usr/local/src/gnuradio-3.7.2.1/gr-uhd/apps# ./uhd\_fft  
Traceback (most recent call last):  
File “./uhd\_fft”, line 23, in   
from gnuradio import gr, gru  
ImportError: No module named gnuradio

## This is the message i’ve got when installing gnuradio with command: cmake -DENABLE\_VOLK=FALSE …/ ###################################################### – # Gnuradio enabled components – ###################################################### – \* python-support – \* testing-support

## – ###################################################### – # Gnuradio disabled components – ###################################################### – \* volk – \* doxygen – \* sphinx – \* gnuradio-runtime – \* gr-ctrlport – \* gr-blocks – \* gnuradio-companion – \* gr-fec – \* gr-fft – \* gr-filter – \* gr-analog – \* gr-digital – \* gr-atsc – \* gr-audio – \* gr-comedi – \* gr-channels – \* gr-noaa – \* gr-pager – \* gr-qtgui – \* gr-trellis – \* gr-uhd – \* gr-utils – \* gr-video-sdl – \* gr-vocoder – \* gr-fcd – \* gr-wavelet – \* gr-wxgui

– Using install prefix: /usr/local  
– Building for version: 3.7.2.1 / 3.7.2.1  
– Configuring done  
– Generating done  
– Build files have been written to:  
/usr/local/src/gnuradio-3.7.2.1/build

Can anyone help to solve this issue

Thanks,  
sammy

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**Author:** ![sammy\_zada](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/ee7513/32.png) [@sammy\_zada](https://www.ruby-forum.com/u/sammy_zada)\
**Post date:** [June 4, 2014, 11:06am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/230189/2 "2014-06-04T11:06:30Z")

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Hi Sammy,  
when building, basically _everything_ was not built, so you don’t really  
have GNU Radio installed.  
This is usually due to missing a crucial dependency of GNU Radio.  
How did you install?  
I recommend using pyBOMBs, if you didn’t, because that should take care  
of installing dependencies:  
[http://gnuradio.org/redmine/projects/pybombs/wiki/QuickStart](http://gnuradio.org/redmine/projects/pybombs/wiki/QuickStart)

Greetings,  
Marcus

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**Author:** ![sammy\_zada](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/ee7513/32.png) [@sammy\_zada](https://www.ruby-forum.com/u/sammy_zada)\
**Post date:** [June 4, 2014, 11:07am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/230189/3 "2014-06-04T11:07:05Z")

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Ah, missed that. You should not disable VOLK - almost all of GNU Radio  
uses that by now.