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Re: [Discuss-gnuradio] How to capture the Rx data using uhd_rx_cfile and

From: Josh Blum
Subject: Re: [Discuss-gnuradio] How to capture the Rx data using uhd_rx_cfile and agree with the uhd_fft Scope mode data
Date: Wed, 26 Sep 2012 14:55:31 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120827 Thunderbird/15.0

On 09/26/2012 01:36 AM, LD Zhang wrote:
> Hi,
> I did try and made a GRC example of using a USRP Source and a fft sink,
> scope sink, and a file sink to test out the idea.
> When looking at the scope sink, the data is about +/- 2x10^-4. I changed
> the gain of the USRP source block to 20 dB. But nothing happened to the
> signal amplitude. How is this possible?

You mentioned LFRX? There are no configurable gain elements for the LFRX

If this helps, the various gain ranges are listed for various
daughterboard frontends here:


> Please see the attached GRC if you want to see what I am doing. Thanks.
> LD
>> I could go directly to GRC GUI directly and try to learn to do everything
>>> there. But I think there is value in being able to do this simple thing
>>> from the command line. Your help and suggestions are appreciated.
>> I will second this motion.
>> All of the hooks are available in the USRP source block, most of which
>> can be changed at runtime with a simple variable widget. Its nice to
>> change setting at runtime to see the effect.
>> Also, you can easily attach a file sink and a scope sink and an fft
>> sink. That way you know that you have captured to file the same thing
>> you are observing.
>> Also, be careful with the format of the file data. Its a binary array of
>> std::complex<float>, not float, not double, etc...
>> -josh
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