<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=US-ASCII">
<META content="MSHTML 6.00.2900.2180" name=GENERATOR></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial" bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=role_document face=Arial color=#000000 size=2>
<DIV>I posted the below message to this reflector 3 days ago!!!!!</DIV>
<DIV> </DIV>
<DIV>Magister = Ozy</DIV>
<DIV>
<META content="MSHTML 6.00.2900.2180" name=GENERATOR><FONT id=rolx_document face=Arial color=#000000 size=2>
<DIV>Please beware if you are using an LPU to power your HPSDR system.</DIV>
<DIV> </DIV>
<DIV>As noted in LPU documents, it is rated 12 V @ 2 A and 5 V @ 2 A.</DIV>
<DIV> </DIV>
<DIV>The following info is contained in the same document:</DIV>
<DIV> </DIV>
<DIV>
12 V 5 v</DIV>
<DIV>OZY .001
A .1 A</DIV>
<DIV>PENY
.4 A .2 A</DIV>
<DIV>MERC .2
A .5 A</DIV>
<DIV> </DIV>
<DIV>and on Jan 12, Phil posted the following:</DIV>
<DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>Please note that with Metis running at 1Gb/s the +5v supply current
will<BR>increase by approximately 0.75A.<BR><BR>For this reason (for folks that
are using LPUs), and the fact that we<BR>don't need 1Gig rates to the PC just
yet, the initial release of Metis<BR>code will run at 100Mb/s.<BR><BR>73
Phil...VK6APH<BR><BR>*******</DIV>
<DIV> </DIV>
<DIV>End result is that the LPU is NOT suited to run HPSDR with multiple Mercury
</DIV>
<DIV>boards, Metis, Excalibur ( not sure on power usage), and Peny. The 5 V
regulator </DIV>
<DIV>is only rated at 2 A and I have experienced the 2.2 ohm resistor burning
up. </DIV>
<DIV>I measured the 5 V current drain with 5 boards on Atlas and in receive
mode</DIV>
<DIV>it was 2.97 Amps. This exceeds LPU specs. Add the fact that at 1Gb/s
the</DIV>
<DIV>current will increase by .75 Amps.</DIV>
<DIV> </DIV>
<DIV>If you are experiencing less than proper operation of your system, check
your</DIV>
<DIV>voltage at the Atlas test points.</DIV>
<DIV> </DIV>
<DIV>PLEASE BE AWARE!</DIV>
<DIV> </DIV>
<DIV>73 de Joe</DIV>
<DIV>K1RQG</DIV></FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/22/2011 5:13:42 P.M. Eastern Standard Time,
ka6tya@arrl.net writes:</DIV>
<BLOCKQUOTE style="PADDING-LEFT: 10px; MARGIN-LEFT: 10px"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>*****
High Performance Software Defined Radio Discussion List *****<BR><BR>What is
Metis VS Magister power usage?<BR><BR>The Metis manual state .4A
from 5v at 100T and .75A at 1000T<BR><BR>I do not see Magister requirements
stated anywhere.<BR><BR>With Magister I encounter no problems.<BR><BR>With
Metis the equipment would operate for a while then unexpectedly <BR>shut
down.<BR><BR>The LPU Errata #2 state Fuses F2 & F3 are underrated for a
full system <BR>and recommend shorting F2 & F3.<BR><BR>When I replace the
LPU with a PC power supply no problems are encountered.<BR><BR>Anyone else
experiencing this
problem?<BR>_______________________________________________<BR>HPSDR
Discussion List<BR>To post msg: hpsdr@openhpsdr.org<BR>Subscription help:
http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<BR>HPSDR web page:
http://openhpsdr.org<BR>Archives:
http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>