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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Isaac,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>After seeing your post, I took some snapshots (quickly done, my
apologies for the photo quality) of my approach. Temporary links
provided:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a href="http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25.jpg">http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25.jpg</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a
href="http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25%20002.jpg">http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25%20002.jpg</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><a
href="http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25%20003.jpg">http://dl.dropbox.com/u/9282924/HPSDR%202010-08-25%20003.jpg</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My objectives were: (1) move the rats-nest of cables
INSIDE the box so that I could control grounding of everything exiting the box
(to manage RF in a QRO environment), and (2) arrange boards to allow a more
“straight-through” airflow for cooling. I believe I’ve accomplished the
objectives … with just a couple other learning experiences along the way, the
unit is working well with my Alpha 89 amplifier. Even though it’s tight,
Hercules does fit in this Pandora.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You probably can’t see it, but I added a small PC board that
contains a DPDT relay and a couple extra open-collector outputs for switching
the external amplifier and whatever else comes along in the future. I’m
also currently working on a board layout to replace the LPU with the objectives
of: (1) removing the +3.3 and -12 regulators that I don’t use, (2)
splitting the +5V regulator heat between 2 heatsinks (parallel pass transistors),
(3) adding overvoltage protection, and (4) adding an “isolated” regulator to
generate a small amount of power for microphones that require it for lights,
pre-amps, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I changed the feedback resistors on the Penelope output amp to
reduce the power output to drive Hercules. (There are a couple other easy
ways to deal with this also.)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think Pandora is an excellent experimenter’s enclosure.
However, I’ll probably do a custom enclosure for my next version as my
objectives are somewhat different.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Warren, NR0V<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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