# Spectrum chunk

**URL:** <https://www.ruby-forum.com/t/spectrum-chunk/230053>\
**Category:** GNU Radio\
**Created:** [May 28, 2014, 4:00pm UTC](https://www.ruby-forum.com/t/spectrum-chunk/230053 "2014-05-28T16:00:00Z")\
**Posts on this page:** 2\
**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:** [May 28, 2014, 4:00pm UTC](https://www.ruby-forum.com/t/spectrum-chunk/230053/1 "2014-05-28T16:00:00Z")

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dear list,  
I am digging to find out how to record a frequency bandwidth e.g.  
1100-1125MHz;  
I already have USRP1 with DBRX, which I suppose able to capture 25MHz  
frequency bandwidth as per their specification.  
I played around ursp\_rx\_cfile but with single frequency, now I want to  
record a frequency spectrum then later wish to divide it into several  
frequency parts (which I presume can be done by channelizing, but any  
other  
idea most welcome).  
Taking above idea in my mind I am confused as if DDC of URSP (any  
combination of rbf files) is able to process this much data??  
if yes, please guide me where to strike first??  
is GRC good way to go ahead??  
guidance is highly appreciated  
Thanks in advance

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**Author:** ![gsmandvoip](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/e19adc/32.png) [@gsmandvoip](https://www.ruby-forum.com/u/gsmandvoip)\
**Post date:** [May 28, 2014, 4:17pm UTC](https://www.ruby-forum.com/t/spectrum-chunk/230053/2 "2014-05-28T16:17:26Z")

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On a USRP1, you can get 8 MHz across the wire (16 MHz if you go to 8 bit  
samples). This is a matter of USB2.0 not being able to transport more  
data.

Once you have a chunk, channelization is the way to go, and GRC is  
generally a good tool to use.

M