<div dir="ltr"><div dir="ltr"><div>Hi Bill - thanks for iterating the specification. Here are a few comments on 0.3:</div><div><br></div><div>There are no paragraph numbers to reference, and the page numbers may change</div><div>depending on how mark-up is selected by the reader, so I'll reference the Title of the paragraph.</div><div><br></div><div>General Requirements - Assumptions and Dependencies:</div><div><br></div><div>1. The HD may be able to be reduced to 2TB if the 20GE snapshot<br>can be made while recording to the ring buffer. 2T SSD drives<br>are coming down in price faster than 4T.</div><div><br></div><div>Technical Notes</div><div><br></div><div>I am skeptical that a SBC-based host can run HDF5 and keep up<br>with the received data. My quad Core I7-3740 3.4 GHz can not </div><div>keep up with 4 x 192k from one antenna (one fourth the DE</div><div>requested throughput). It may be better to run HDF5 only on the</div><div>snapshot that is uploaded to the Central Server. That way it<br></div><div>doesn't have to run at real-time speed, it only needs to code a small</div><div>subset of the data and can run at a much slower rate paced by how</div><div>fast the upload link is.</div><div><br></div><div>Data format. The DE will downconvert and decimate the received <br>samples. This will produce 24 bit I and 24 bit Q samples, probably 2's<br>complement binary. These will need to be converted to single<br>precision floating point I and floating point Q prior to HDF5 encoding.</div><div><br> -- Tom, N5EG</div><div><br></div><div><br></div></div></div><br><div class="gmail_quote"><div class="gmail_attr" dir="ltr">On Fri, May 24, 2019 at 12:40 PM Engelke, Bill via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org">tangerinesdr@lists.tapr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
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<p class="MsoNormal">Scotty - Please see attached, updated to include some of the things discussed at Dayton. Next I will work on the Functional Specifications for the Central Control & Database system.<u></u><u></u></p>
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<p class="MsoNormal">If anyone would like me to start posting to the TAPR github or somewhere, please just text credentials to my mobile number, below. I can assure everyone that I will not make a mess of it, having done this before.<u></u><u></u></p>
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<p class="MsoNormal">W. D. Engelke (Bill), Asst. Research Engr.<u></u><u></u></p>
<p class="MsoNormal">Center for Advanced Public Safety<u></u><u></u></p>
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