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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] digitizing a digital data stream with USRP2 |
Date: | Wed, 17 Feb 2010 11:04:50 -0800 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.7) Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1 |
I'm not intimately familiar with GNU radio hardware and the experts here will hopefully correct me if needed, but I think you would face these issues: 1) The default FPGA logic doesn't offer a demodulation enable/disable, so you'd have to make some logic changes and rebuild.
no changes are necessary. He can just set the tuning frequency to 0.
2) Assuming the A/D converters on the LFTX and LFRX are> 8 bits and<= 16 bits, then the maximum sampling rate you could move over GbE would be around 60 MHz. Is that enough for your application? If you need faster rates but only in bursts (like a radar situation) then possibly some memory (block RAM) in the USRP2 FPGA could be used for buffers. I'm not sure how much is available... a build without demodulation would probably free up some mem.
There are no AD converters on the daughterboards, they are on the motherboard. And they are 14 bits.
3) Continuous streaming to HDD file could be difficult, or at least would require careful configuration of the HDD file system, real-time scheduling and other system considerations, and of course careful programming.
We suggest turning off journaling in the filesystem. If that isn't enough, an SSD or RAID should be able to keep up.
Matt
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