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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Better pictures posted:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Atlas First Light: </span></font><b><font size=1
color="#0000cc" face=Verdana><span style='font-size:7.5pt;font-family:Verdana;
color:#0000CC;font-weight:bold'> <a
href="http://www.hamsdr.com/personaldirectory.aspx?id=200">http://www.hamsdr.com/personaldirectory.aspx?id=200</a><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Complete Atlas with picoPSU off:</span></font><b><font
size=1 color="#0000cc" face=Verdana><span style='font-size:7.5pt;font-family:
Verdana;color:#0000CC;font-weight:bold'> http://www.hamsdr.com/personaldirectory.aspx?id=201<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Complete Atlas with picoPSU on: </span></font><b><font
size=1 color="#0000cc" face=Verdana><span style='font-size:7.5pt;font-family:
Verdana;color:#0000CC;font-weight:bold'> <a
href="http://www.hamsdr.com/personaldirectory.aspx?id=">http://www.hamsdr.com/personaldirectory.aspx?id=</a>202<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=1 color="#0000cc" face=Verdana><span
style='font-size:7.5pt;font-family:Verdana;color:#0000CC;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#0000cc" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#0000CC;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Chris – AE6VK<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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<hr size=3 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Christopher T.
Day <br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, April 23, 2006 5:51
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Christopher T. Day;
hpsdr@hpsdr.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [hpsdr] Atlas First
Light</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>More pix of the completed Atlas #2 board
sans tantalum capacitors; smaller ones on order.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Power off: </span></font><b><font size=1
color="#0000cc" face=Verdana><span style='font-size:7.5pt;font-family:Verdana;
color:#0000CC;font-weight:bold'><a
href="http://www.hamsdr.com/personaldirectory.aspx?id=198">http://www.hamsdr.com/personaldirectory.aspx?id=198</a><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Power on: </span></font><b><font size=1 color="#0000cc"
face=Verdana><span style='font-size:7.5pt;font-family:Verdana;color:#0000CC;
font-weight:bold'><a href="http://www.hamsdr.com/personaldirectory.aspx?id=199">http://www.hamsdr.com/personaldirectory.aspx?id=199</a><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#0000cc" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#0000CC;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If Bob would enhance these as well, I’ll repost all
three improved images. Otherwise, I’ll try again, but I don’t’
want to wash out the LEDs with the camera flash.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The picoPSU-120 seems to have no problems starting and
stopping when the switch changes even without any minimal load resistor.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>A couple of thoughts now that I have one of these things
physically in front of me:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I doubt that
it is worth the trouble to take out the -5VDC circuitry. It is an allowed
option in the ATX spec and somebody else’s ATX power supply might provide
it. Anyway, we’re too close to a working board to bother changing it just
for that, I think.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I think I/O
connectors should go on the edge of Atlas daughter boards that is away from the
power connector. It’s fairly close between the picoPSU and the first DIN
connector. The edge away from the picoPSU – bottom in my pictures –
has more room for hardware connectors.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>3)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>2-56
hardware seems good for attaching the DIN connectors. (I think that comes out M
2.5 in metric, but somebody had better check.) My local hardware store had 2-56
x ¼” screws; these are a tad too sort as there is no length available for
a lockwasher. Since the hardware store didn’t have any #2 lockwashers, I
went with the ¼” anyway. Screws, lockwashers and nuts ought to go on the
BOM, but Mouser doesn’t carry such things, apparently.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Chris – AE6VK<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Christopher T.
Day <br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, April 22, 2006
11:08 PM<br>
<b><span style='font-weight:bold'>To:</span></b> hpsdr@hpsdr.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [hpsdr] Atlas First Light</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Bulletin:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have posted a picture – only 600x800 this time
– of “First Light” observed with the Atlas board.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#0000cc" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#0000CC;font-weight:bold'><a
href="http://www.hamsdr.com/personaldirectory.aspx?id=196">http://www.hamsdr.com/personaldirectory.aspx?id=196</a><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I got anxious to see something, so this is an early stage.
The tantalum capacitors are not installed because of the size issue I mentioned
in earlier e-mails. The ceramic bypass capacitors are all installed as well as
the dropping resistors and LEDs. I will do the DIN connectors next. There is a
jumper in the Power_On# position; no switch on hand. That’s all
that’s needed for this board.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>My picoPSU-120 is plugged directly into the ATX power
connector. There is _<i><span style='font-style:italic'>no</span></i>_ extra
load resistor on the board. If you look carefully, you will notice that only
four of the five LEDs are lit on the Atlas board. (The picoPSU has a red LED
and a grenn LED of its own; green for power applied and red for power on,
apparently.) This, as it turns out, is not wrong – the picoPSU only
supplies -12V, not -5V and that’s the LED that is not lit. Voltages at
J20 look fine.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Looking good! More pix to follow.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
Chris – AE6VK<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>P.S. – “First Light” is the term for the
inaugural picture from a new telescope.<o:p></o:p></span></font></p>
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