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<p>Hello Tom!</p>
<p>Is there a document that describes the Space Weather Station
System so I can more easily see where the weather station fits
into the overall scheme of things?</p>
<p>5. RF Module</p>
<p>I worry about pluggable filter modules because that implies
custom stuff and thus a need for someone to design it/them.
Still, an external filter module (small Hammond or other shielded
box with 50-ohm in and out) could always be used so this is
probably a Good Thing to include.</p>
<p>Not sure what 88 dB dynamic range for directly sampled signals
means. A perfect 14 bit ADC would have about 84 dB raw dynamic
range. The LTC2208, still one of the best 16-bit ADCs I think,
has an effective number of bits of just under 13 (12.6 is the
number I've seen) though the spec sheet claims a Spurious Free DR
of 100 dB.</p>
<p><br>
</p>
<p>7. Host Computer</p>
<p>Since the magnetometer specification is so vague, and since it
only needs to be processed once per second (and I assume a few
microseconds or even milliseconds of uncertainty in that sampling
would have negligible impact) I suspect the host computer is much
better suited to collect and format the data. If the interface is
some standard thing easily implemented by a standard FPGA library
(like a SPI or SPI port) then the FPGA could gather the raw
samples.</p>
<p>Hopefully a magnetometer thingy can be located that meets
whatever the needs are for it, that is already equipped with an
interface that can be read by a PC over a standard interface.</p>
<p>---</p>
<p>Just some initial thoughts,</p>
<p>Lyle<br>
</p>
<div class="moz-cite-prefix">On 5/2/19 7:47 AM, Tom McDermott via
TangerineSDR wrote:<br>
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<div>Attached in PDF format is a very preliminary system
specification for the Personal Space Weather Station (PSWS).</div>
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<div>There are lots of open issues and questions at this point,
the document tries to highlight a few of the key ones.</div>
<div><br>
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<div>It would be nice to have several sets of eyeballs look this
over before we advance it any further.</div>
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<div>-- Tom, N5EG</div>
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