Hello Tom & Nick,

Thanks for your help. I am here to ask another question.

I am using the following command
sudo python usrp2_rx_cfile.py -f 800M -N 1000 -d 100 -s -v output.dat

After that, I converted the .dat file using octave command
(read_complex_binary).

However, the values I am getting are ambiguous.
I am getting lots of 0 (zeros) and lots of Nan (dont know what does it
mean though)..I have no idea about it.

Here is the snapshot of what I get. I would really appreciate if
somebody can give any idea about this. Thank you.

------snapshot-----------
(9.183409485952689e-41,0)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,NaN)
 (9.183409485952689e-41,0)
 (NaN,9.183409485952689e-41)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,9.183409485952689e-41)
 (NaN,NaN)
 (9.183409485952689e-41,0)
 (NaN,NaN)
 (0,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (0,9.183269356106256e-41)
 (9.183409485952689e-41,9.183409485952689e-41)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)



On Sat, Nov 19, 2011 at 12:16 AM, Tom Rondeau <trondeau1...@gmail.com>wrote:

> On Thu, Nov 17, 2011 at 6:41 PM, Hasan Rajib Imam <shuvo1...@gmail.com>wrote:
>
>> Hello Nick,
>>
>> Thanks for your reply.
>>
>>
>> "you can use Gnuradio blocks such as the decimating FIR filter to
>> decimate additionally by however much you like."
>>
>> Could you please tell me how can I do the above thing? Actually I am very
>> new to gnuradio. I will really appreciate your help.
>>
>> Thanks.
>
>
> Hasan,
>
> You can use the gr.fir_filter_XXX(decim, taps) or gr.fft_filter_XXX(decim,
> taps). The taps are generally defined using gr.firdes.low_pass_2(gain,
> sample rate, bw, transition, attenuation, window). The 'decim' parameter
> for these blocks is an integer.
>
> fft_filter:
> http://gnuradio.org/doc/doxygen/classgr__fft__filter__ccc.html
>
> fir_filter:
> http://gnuradio.org/doc/doxygen/classgr__fir__filter__ccc.html
>
> firdes:
> http://gnuradio.org/doc/doxygen/classgr__firdes.html
>
> Tom
>
>
>
>
>
>>
>> On Fri, Nov 18, 2011 at 1:29 AM, Nick Foster <n...@ettus.com> wrote:
>>
>>> On Thu, Nov 17, 2011 at 8:28 AM, Nick Foster <n...@ettus.com> wrote:
>>> > On Thu, Nov 17, 2011 at 2:33 AM, hasanimam <shuvo1...@gmail.com>
>>> wrote:
>>> >>
>>> >> Hello all,
>>> >>
>>> >> I am here once again and would like to bother you a bit.
>>> >> I am using the usrp2_rx_cfile.py command to get the IQ data from
>>> usrp2. I am
>>> >> using the following command
>>> >>
>>> >> sudo python usrp2_rx_cfile.py -f 800M -d 496 -s -v -N 10
>>> >> /home/gnuradio4/Desktop/observed_data/test.dat
>>> >>
>>> >> And I am getting the following output:
>>> >>
>>> >> Network interface: eth0
>>> >> USRP2 address: 00:50:c2:85:35:7d
>>> >> Using RX d'board id 0x0053
>>> >> Rx gain: 15.75
>>> >> Rx baseband frequency: 800M
>>> >> Rx DDC frequency: 0
>>> >> Rx residual frequency: 0
>>> >> Rx decimation rate: 512
>>> >> Rx sample rate: 195.312k
>>> >> Receving 10 samples
>>> >> Writing 16-bit complex shorts
>>> >> Output filename: /home/gnuradio4/Desktop/observed_data/test.dat
>>> >>
>>> >> In the above, it shows that the sample rate is 195.312k. I want to
>>> raise
>>> >> this rate but it seems that decimation rate has a limit upto 512 so i
>>> cant
>>> >> do that.
>>> >> Can you suggest me any other way to raise the sample rate?
>>> >> In fact I want the time difference between each sample to be around
>>> 100us,
>>> >> but sample rate 195k gives me 5us.
>>> >
>>> > "Decimation" means the ratio by which the 100MHz main clock is
>>> > divided. 100MHz / 512 = 195.312kHz. Try using a lower decimation.
>>>
>>> Oh, I think I misunderstood your question, sorry -- you don't want to
>>> raise the SAMPLE rate, you want to raise the DECIMATION. In that case,
>>> you can use Gnuradio blocks such as the decimating FIR filter to
>>> decimate additionally by however much you like.
>>>
>>> --n
>>>
>>> >
>>> > --n
>>> >
>>> >>
>>> >> Thank you.
>>> >>
>>> >>
>>> >> --
>>> >> View this message in context:
>>> http://old.nabble.com/usrp2_rx_cfile.py-issue-tp32860995p32860995.html
>>> >> Sent from the GnuRadio mailing list archive at Nabble.com.
>>> >>
>>> >>
>>> >> _______________________________________________
>>> >> Discuss-gnuradio mailing list
>>> >> Discuss-gnuradio@gnu.org
>>> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>> >>
>>> >
>>>
>>
>>
>>
>> --
>> Hasan Rajib Imam
>> University of Electro-Communication, Japan
>> 1st year Masters Student
>> Email: shuvo1...@gmail.com
>> Contact No: (+81)80-5004-5931
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
>


-- 
Hasan Rajib Imam
University of Electro-Communication, Japan
1st year Masters Student
Email: shuvo1...@gmail.com
Contact No: (+81)80-5004-5931
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