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A couple of months ago I decided to retire LPU in favor of the
picoPSU-120-WI-25. This appears to fulfill the current requirements
of the usual suspects + Metis at 1 Gigabit. The picoPSU spec quotes
two figures for 5V:<br>
<br>
5V 6A<br>
5VSB 1.5A<br>
<br>
I have no idea what 5VSB refers to - maybe somebody can shed some
light on this designation?<br>
<br>
The picoPSU unit is quite small and does not have the tall heatsinks
used with LPU. It supposedly runs quite a bit cooler but I left
the fan in place figuring some air flow through Pandora can't hurt.<br>
<br>
Pete, N3EVL<br>
<br>
On 12/28/2011 10:03 AM, Chris Day wrote:
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<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
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Thanks, Erich. Replacing the soft fuses with wire has been
enough so far, but I haven't fired up the transmitter section of
Pennylane yet. Linear chain will be external, so there will be
no extra load from that. Meanwhile, playing with Mercury with
delightful results.<br>
<br>
Chris Day<br>
AE6VK<br>
<br>
<br>
<div>> Date: Wed, 28 Dec 2011 04:12:10 -0800<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:vk5hse@yahoo.com">vk5hse@yahoo.com</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a><br>
> Subject: Re: [hpsdr] LPU Capacity<br>
> <br>
> ***** High Performance Software Defined Radio Discussion
List *****<br>
> <br>
> Have cobbled together various reflector postings for my
own reference as well as for others.<br>
> <br>
> <br>
> There was a summary posted to the reflector that is worth
reviewing:<br>
> <br>
>
<a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2011-March/014678.html">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2011-March/014678.html</a><br>
> <br>
> the meaty bits were:<br>
> <br>
> Magister = Ozy<br>
> <br>
> <br>
> power consumption summary:<br>
> <br>
> <br>
> 12 V 5 v<br>
> OZY .001 A .1 A<br>
> PENY .4 A .2 A<br>
> MERC .2 A .5 A<br>
> <br>
> Metis 100 .4A<br>
> <br>
> Metis 1000bT .75A<br>
> <br>
> <br>
> no-one seems to have stated excalibur power requirements,
but it doesn't appear to be huge<br>
> <br>
> <br>
> add the LPU errata document:<br>
> <br>
> <a class="moz-txt-link-freetext" href="http://www.tapr.org/pdf/LPU_Errata.pdf">http://www.tapr.org/pdf/LPU_Errata.pdf</a><br>
> <br>
> which mentions in errata #2:<br>
> <br>
> "Description of Error:<br>
> Fuses F2 and F3 are underrated for a full system. They
are rated at continuous 1.1A without<br>
> tripping, while an Ozy/Mercury/Penelope system draws
typically 1.3A from the +5V rail.<br>
> <br>
> <br>
> Symptoms:<br>
> An Ozy/Mercury/Penelope system will operate for a short
period and then unexpectedly shut<br>
> down. The time can vary, but is typically around 10
minutes. This is due to F2 opening and shutting<br>
> down the +5V output. (Note that F2 doesn’t actually
“open”; it becomes higher resistance to protect<br>
> the load.) After a power cycle, normal operation resumes.<br>
> <br>
> <br>
> Recommended Corrective Action:<br>
> Short across F2 and F3 with pieces of wire."<br>
> <br>
> <br>
> <br>
> There has also been talk of strapping the 12V feedtrhough
for high power things like a PA<br>
> <br>
>
<a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012616.html">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012616.html</a><br>
> <br>
> and some suggestion of shorting the 5V fuse and relying
on the regulator to protect itself +/- modifying R6 the series
resistor<br>
> <br>
>
<a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012617.html">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012617.html</a><br>
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