<div dir="ltr"><div>Hi Scotty, I was hoping everyone would generally prefer Option C.</div><div>Now the question is which distribution option we should look at, 1,2, or 3?</div><div>(i.e. have the DE or interconnect board regulate and distribute, have each board do it on it's own, or external).</div><div><br></div><div>-- Tom, N5EG<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 13, 2019 at 2:09 PM Scotty Cowling 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;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
Hi Tom,<br>
<br>
Option C is the easiest and in my opinion, only viable option. A
wide range input that includes 11-15V allows multiple battery
chemistries, while enabling common linear and switching bench
supplies to be used. Ech locale knows best how to get this standard
voltage from their local mains supply. And while we will do our best
to filter the input power rail, if the user connects it to a noisy
solar system, it beyond our scope to mitigate his interference
issues.<br>
<br>
The typical modern mixed-mode designs do what John A was describing:
start with a wide-range noisy input, then regulate to a narrow-range
less noisy but still not quiet enough intermediate voltage, then use
LDOs and lots of filtering to get analog-quality 3.3V, 2.5V or 1.8V
supplies. Keep the analog power separate from the digital power. Use
series inductors and multiple-capacitor filters where necessary
(they are small and inexpensive at low currents). If you pick your
intermediate voltage(s) properly, you can minimize the power
dissipation of the linear regulators while still gaining the
low-noise advantages of LDOs.<br>
<br>
Every design should have clock tree and and power tree diagrams
along with its block diagram.<br>
<br>
73,<br>
Scotty WA2DFI<br>
<br>
<br>
<br>
<div class="gmail-m_-427524695741843412moz-cite-prefix">On 9/13/2019 11:52 AM, Engelke, Bill
via TangerineSDR wrote:<br>
</div>
<blockquote type="cite">
<div class="gmail-m_-427524695741843412WordSection1">
<p class="MsoNormal">Something to consider on this, for
convenience of the user: the Odroid N2, which we are
thinking is the likely SBC in the Tangerine, runs on 12v also
(not 5v).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<ul style="margin-top:0in" type="disc">
<li class="gmail-m_-427524695741843412MsoListParagraph" style="margin-left:0in">73- Bill,
AB4EJ<u></u><u></u></li>
</ul>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b>From:</b> TangerineSDR
<a class="gmail-m_-427524695741843412moz-txt-link-rfc2396E" href="mailto:tangerinesdr-bounces@lists.tapr.org" target="_blank"><tangerinesdr-bounces@lists.tapr.org></a>
<b>On Behalf Of </b>Tom McDermott via TangerineSDR<br>
<b>Sent:</b> Friday, September 13, 2019 8:29 AM<br>
<b>To:</b> Phil Erickson <a class="gmail-m_-427524695741843412moz-txt-link-rfc2396E" href="mailto:phil.erickson@gmail.com" target="_blank"><phil.erickson@gmail.com></a><br>
<b>Cc:</b> Tom McDermott <a class="gmail-m_-427524695741843412moz-txt-link-rfc2396E" href="mailto:tom.n5eg@gmail.com" target="_blank"><tom.n5eg@gmail.com></a>; TAPR
TangerineSDR Modular Software Defined Radio
<a class="gmail-m_-427524695741843412moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org" target="_blank"><tangerinesdr@lists.tapr.org></a><br>
<b>Subject:</b> Re: [TangerineSDR] DCC discussion list<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">HI Phil - We certainly will need
requirements on power & distribution characteristics.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">However I think we first may need a
plan.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Question 1: do we operate off:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option A: 120VAC input (North America)<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option B: 120-240VAC input (Worldwide)<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option C: + 12VDC input? [ +12V
means in my view +10.5 to +13.8 VDC, allowing a battery
to be the power input. ]<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">In my view Option C is the easiest for
project engineering, but requires the user to generate
+12V, battery charge, etc.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Given the possible worldwide AC
variables, battery type and size variables, etc., it
avoids many issues.<u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">If we were to choose Option C then,
at the system level then:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Question 2 how do we create needed
voltages: <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option 1. Data Engine regulates &
distributes all the system voltages from a single
+12VDC (11-13.8V) input.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option 2: Separate DC supply derives
all the needed voltages from +12VDC (11-13.8V) input.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Option 3: Each module derives it's
own voltages from a +12VDC (11-13.8V) input.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">-- Tom, N5EG<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Thu, Sep 12, 2019 at 7:00 PM Phil
Erickson <<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</a>>
wrote:<u></u><u></u></p>
</div>
<blockquote style="border-color:currentcolor currentcolor currentcolor rgb(204,204,204);border-style:none none none solid;border-width:medium medium medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">Hi Tom,<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"> It is probably good for item 5 to
think about whether cleanliness specs for the power
supply are required. As you know, hash on the DC
lines could be a major RFI problem. (Batteries would
tend not to have that issue, hence their mention
earlier.)<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">73<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Phil<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Thu, Sep 12, 2019 at 9:58 PM Tom
McDermott via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>>
wrote:<u></u><u></u></p>
</div>
<blockquote style="border-color:currentcolor currentcolor currentcolor rgb(204,204,204);border-style:none none none solid;border-width:medium medium medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal">I've combed the meeting notes
and some other thoughts and put together a frist
draft of possible DCC discussion topics for HAMSCI
/ TangerineSDR.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Please review and send me
additions, deletions, changes, etc. by Monday the
16th and I'll iterate once before the conference.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">-- Tom, N5EG<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:14pt">HAMSCI project
discussion Topics for DCC 2019</span></b><u></u><u></u></p>
</div>
<p>1. Need cost estimates for the Clock, DE, RF,
and Magnetometer modules.<br>
2. What is the schedule for the modules, testing,
prototypes?<br>
a. Data Engine<br>
b. 2-chan RF receiver<br>
c. GPS Clock<br>
d. Magnetometer<br>
e. Other ? SBC, Power supply, etc.<br>
3. Each module will have a unique manufacturer
serial number based on some PROMs that have this
capability. Any issues with the number or format?<br>
4. Do we need to create any videos describing
what the project is, what the objectives are,
status, or other?<br>
5. No discussion so far on power supplies, other
than a request for +12V battery power capable. Do we
need a plan?<br>
6. HAMSCI 2020<br>
a. Any more information on the location?<br>
b. Should we plan a demo of TangerineSDR or
the completed parts?<br>
7. Receive Antennas. Mike Pappas has acquired a
calibrated filed strength meter, we discussed seeing
if DX Engineering would let us measure a production
lot of antennas (10?) to determine the field
strength sensitivity and variance.<br>
8. Do we need a test plan for the system?<br>
9. Upload data compression appears feasible (3:1
?). Do we need any study or proposals of how much
data we are asking folks to upload? Or is this
better to determine experimentally?<u></u><u></u></p>
<p><u></u> <u></u></p>
<p><u></u> <u></u></p>
</div>
<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><u></u><u></u></p>
</blockquote>
</div>
<p class="MsoNormal"><br clear="all">
<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal">-- <u></u><u></u></p>
<div>
<p class="MsoNormal">----<br>
Phil Erickson<br>
<a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</a><u></u><u></u></p>
</div>
</blockquote>
</div>
</div>
<br>
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</blockquote>
<br>
</div>
-- <br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
</blockquote></div>