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Re: [Discuss-gnuradio] digitizing a digital data stream with USRP2

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] digitizing a digital data stream with USRP2
Date: Wed, 17 Feb 2010 11:02:17 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1

On 02/17/2010 09:38 AM, John Carlson wrote:
I have a USRP2 and I'm interested in doing an experiment where I'd like
to simply use the USRP2 as an A/D and D/A device, essentially disabling
the RF tuning portions.  The signal I'm trying to digitize is a stream
of digital TTL pulses.  I assume that the best way to interface to this
is through the DC-30MHz LFTX and LFRX daughtercards that would pass DC.
  Could anyone provide me with additional guidance on how to run this
test?  Thanks in advance.

Yes, the LFTX and LFRX are the best boards for what you are looking to do. You'd want to use usrp2_rx_cfile.py to record samples to disk. Depending on your data rate and how long you intend to record for you may need very fast disks. SSDs work well.


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