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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><div id="SkyDrivePlaceholder"></div>> Date: Wed, 28 Dec 2011 04:12:10 -0800<br>> From: vk5hse@yahoo.com<br>> To: hpsdr@lists.openhpsdr.org<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>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2011-March/014678.html<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>> http://www.tapr.org/pdf/LPU_Errata.pdf<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>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012616.html<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>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012617.html<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></div> </div></body>
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