<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2912" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=d.c.proctor@gmail.com href="mailto:d.c.proctor@gmail.com">David
Proctor</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hpsdr@hpsdr.org
href="mailto:hpsdr@hpsdr.org">High Performance Software Defined Radio
Discussion List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, June 18, 2006 9:54 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [hpsdr] Warning on Atlas! NO
HIGH TEMP WORK!</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>
<P>
<HR>
<P></P>
<DIV> </DIV>
<DIV> This months IET review (used to be called IEE review) has an
article about this very subject.</DIV>
<DIV> </DIV>
<DIV>"...laminates - even those that pass the stringent FR4 test for quality -
are generally unable to withstand the much higher temperatures for lead free
solders..."</DIV>
<DIV> </DIV>
<DIV>However this is written by a rep from the PCB industry who may just (and
I am being cynical here) be trying to justify higher spec/cost
processes.</DIV>
<DIV> </DIV>
<DIV>In any event I shall be happy to manually add my own 60/40 to these
boards and heartily thank all those (particularly the select few) who are
organising this project and carrying it forwards.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BLOCKQUOTE>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I don't understand that. It isn't "much higher",
it's only a few degrees. I just had a look at this Altera document:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.altera.com/literature/an/an353.pdf">http://www.altera.com/literature/an/an353.pdf</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>which confirms it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>73, Leon</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>