<html><head>
<link media="all" type="text/css" href="/webmail/static/deg/css/wysiwyg-3933289048.css" rel="stylesheet">
</head><body>
This reminds me of when I was working for "ma bell". We used to located shorts in a switchboard multiple using a high impedance earphone and a momentary push button to apply battery across the short. As you move across the multiple the ear could differentiate between a very very faint click verses just a faint click. When you're probing between the closest point of the short the click would be extremely weak, thus you've narrowed it down to one panel.<br>Of course a good milli-ohmmeter would come in handy in your case. M cubed makes a LCRZ meter that will measure down into the milli ohm range very easily. Hope you're able to find the short without too much difficulty. I would suggest using a pilot lamp rather than a resistor to limit the current though.<br>73, Bill, wf4r <br>W.B.Runyon,Sr.<br>Amateur Radio WF4R (FM16ts)<br>Chesapeake, VA<br><br>Feb 1, 2009 07:22:19 PM, <a href="mailto:carcia@sbcglobal.net" class="parsedEmail" target="_blank">carcia@sbcglobal.net</a> wrote:<br><blockquote style="border-left: 3px solid rgb(102, 153, 204);">***** High Performance Software Defined Radio Discussion List *****<br><br><br><hr size="1"><br><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit; -x-system-font: none;" valign="top">Why not current limit your power supply with a series resistor and apply power to the board and see what gets warm. Maybe you just fed too much solder into a connector pin. It maigh be an easy fix if you can locate it. I have also used a low voltage scale on a DVM to find the spot of least voltage drop. This is usually close to the short. You have to pump some current through the board to find the low voltage point. an amp or so should be enough. frank</td></tr></tbody></table><br><hr size="1"><br>_______________________________________________<br>HPSDR Discussion List<br>To post msg: <a href="mailto:hpsdr@hpsdr.org" target="_blank" class="parsedEmail parsedEmail">hpsdr@hpsdr.org</a><br>Subscription help: <a href="http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org" class="parsedLink" target="_blank">http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org</a><br>HPSDR web page: <a href="http://hpsdr.org" class="parsedLink" target="_blank">http://hpsdr.org</a><br>Archives: <a href="http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/" class="parsedLink" target="_blank">http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/</a></blockquote></body></html>
1233555818.0