# Using uhd\_fft with USRP N210

**URL:** <https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232>\
**Category:** GNU Radio\
**Created:** [May 20, 2014, 6:08am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232 "2014-05-20T06:08:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 20, 2014, 6:08am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232/1 "2014-05-20T06:08:48Z")

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Hi,

I,m trying to run uhd\_fft with USRP N210, my machine run Ubuntu 12.04.4  
LTS. I’ve already install UHD, gnuradio, & OpenBTS in my machine & works  
fine.

But when i try to run uhd\_fft which is in  
/var/opt/gnuradio-3.7.0/gr-uhd/apps directory, i’ve got the following  
message:  
root@OpenBTS:/var/opt/gnuradio-3.7.0/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

I’ve already try to run make & make install command in  
/var/opt/gnuradio-3.7.0/build/gr-uhd directory, as suggested in previous  
discussion, but it still show the same result.

Can anyone help to solve this issue.

Thanks,  
Tides

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**Author:** ![tides\_anugraha](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/d6d6ee/32.png) [@tides\_anugraha](https://www.ruby-forum.com/u/tides_anugraha)\
**Post date:** [May 20, 2014, 6:19am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232/2 "2014-05-20T06:19:53Z")

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On 05/20/2014 12:07 AM, tides anugraha wrote:

> Traceback (most recent call last):  
> Thanks,  
> Tides
> 
> * * *
> 
> Discuss-gnuradio mailing list  
> [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)  
> I’m going to guess that it’s because your PYTHONPATH doesn’t point at  
> wherever your installer put the various Python modules that Gnu Radio  
> needs. It’s really weird to install permanent libraries and  
> executables under /var/opt.

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<div class="post-metadata">

**Author:** ![tides\_anugraha](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/d6d6ee/32.png) [@tides\_anugraha](https://www.ruby-forum.com/u/tides_anugraha)\
**Post date:** [May 20, 2014, 6:43am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232/3 "2014-05-20T06:43:52Z")

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Any suggestions or reference maybe? where should i install the install  
permanent libraries and executables?

Thanks

---

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**Author:** ![tides\_anugraha](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/d6d6ee/32.png) [@tides\_anugraha](https://www.ruby-forum.com/u/tides_anugraha)\
**Post date:** [May 20, 2014, 6:49am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232/4 "2014-05-20T06:49:29Z")

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On 05/20/2014 12:42 AM, tides anugraha wrote:

> Any suggestions or reference maybe? where should i install the install  
> permanent libraries and executables?
> 
> Thanks

Well, /usr/local is the most usual place for Ubuntu. Sometimes under  
/opt.