[TangerineSDR] Functional Specification v 0.3

[Tom McDermott]

Hi Bill - thanks for iterating the specification.  Here are a few comments
on 0.3:

There are no paragraph numbers to  reference, and the page numbers may
change
depending on how mark-up is selected by the reader, so I'll reference the
Title of the paragraph.

General Requirements - Assumptions and Dependencies:

1. The HD may be able to be reduced to 2TB if the 20GE snapshot
can be made while recording to the ring buffer.  2T SSD drives
are coming down in price faster than 4T.

Technical Notes

I am skeptical that a SBC-based host can run HDF5 and keep up
with the received data. My quad Core I7-3740 3.4 GHz can not
keep up with 4 x 192k from one antenna (one fourth the DE
requested throughput). It may be better to run HDF5 only on the
snapshot that is uploaded to the Central Server. That way it
doesn't have to run at real-time speed, it only needs to code a small
subset of the data and can run at a much slower rate paced by how
fast the upload link is.

Data format.  The DE will downconvert and decimate the received
samples. This will produce 24 bit I and 24 bit Q samples, probably 2's
complement binary.  These will need to be converted to single
precision floating point I and floating point Q prior to HDF5 encoding.

 -- Tom, N5EG



On Fri, May 24, 2019 at 12:40 PM Engelke, Bill via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:

> 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.
>
>
>
> 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
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>
>
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>
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