<div dir="ltr"><div>HI Phil - We certainly will need requirements on power & distribution characteristics.</div><div><br></div><div>However I think we first may need a plan.</div><div><br></div><div>Question 1: do we operate off:</div><div>Option A: 120VAC input (North America)<br></div><div>Option B: 120-240VAC input (Worldwide)<br></div><div>Option C: + 12VDC input? [ +12V means in my view +10.5 to +13.8 VDC, allowing a battery to be the power input. ]<br></div><div><br></div><div>In my view Option C is the easiest for project engineering, but requires the user to generate +12V, battery charge, etc.</div><div>Given the possible worldwide AC variables, battery type and size variables, etc., it avoids many issues.<br></div><div><div><br></div><div></div><div></div><div>If we were to choose Option C then, at the system level then:</div><div> Question 2 how do we create needed voltages: <br></div><div>Option 1. Data Engine regulates & distributes all the system voltages from a single +12VDC (11-13.8V) input.</div><div>Option 2: Separate DC supply derives all the needed voltages from +12VDC (11-13.8V) input.</div><div>Option 3: Each module derives it's own voltages from a +12VDC (11-13.8V) input.</div><div><br></div><div>-- Tom, N5EG</div><div><br></div><div><br></div><div><br></div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 12, 2019 at 7:00 PM Phil Erickson <<a href="mailto:phil.erickson@gmail.com">phil.erickson@gmail.com</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 dir="ltr">Hi Tom,<div><br></div><div> 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.)</div><div><br></div><div>73</div><div>Phil</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">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:<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 dir="ltr"><div dir="ltr">I've combed the meeting notes and some other thoughts and put together a frist draft of possible DCC discussion topics for HAMSCI / TangerineSDR.</div><div dir="ltr">Please review and send me additions, deletions, changes, etc. by Monday the 16th and I'll iterate once before the conference.</div><div dir="ltr"><br></div><div>-- Tom, N5EG</div><div dir="ltr"><br></div><div dir="ltr"><b><span style="line-height:107%;font-size:14pt"><br></span></b></div><div dir="ltr"><b><span style="line-height:107%;font-size:14pt">HAMSCI project discussion Topics for DCC 2019</span></b></div><div dir="ltr">
</div><p style="text-align:left" dir="ltr">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?</p><p style="text-align:left" dir="ltr"><b></b><i></i><u></u><sub></sub><sup></sup><strike></strike><br></p><p style="text-align:left" dir="ltr"><br></p></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail-m_-8983932753434047228gmail_signature">----<br>Phil Erickson<br><a href="mailto:phil.erickson@gmail.com" target="_blank">phil.erickson@gmail.com</a><br></div>
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