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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Phil,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I already had known these
measurements but I cannot find the layer stackup for these boards which is
essential for impedances of the bus lines (striplines). </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Impedance controlled
multilayer boards require a defined layer stackup which specifies besides the
trace widths the thicknesses of copper and insulation layers within the stackup
and a definition for the material which influences the dielectric constant. As
a standard material I presume that FR4 was used. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Probably it is as it is?</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>73, Gerd</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>DJ8AY</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Phil Harman
[mailto:phil@pharman.org] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, September 13, 2008
12:25 PM<br>
<b><span style='font-weight:bold'>To:</span></b> g.loch@nt-electronics.de;
hpsdr@lists.hpsdr.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [hpsdr] Atlas
Impedance Measurements</span></font></p>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hi Gerd,</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>There are some test results by Ray
Anderson WB6TBU in SVN that characterise the Atlas bus. Look at the</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>end of this document </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>\trunk\Atlas\ATLAS_Docu_USLetterLowRes.pdf</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:12.0pt;margin-left:
35.4pt'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>73's
Phil....VK6APH </span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- </span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:35.4pt;background:#E4E4E4'><b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:
bold'>From:</span></font></b><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'> <a href="mailto:g.loch@nt-electronics.de"
title="g.loch@nt-electronics.de">Gerd Loch</a> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:hpsdr@lists.hpsdr.org" title="hpsdr@lists.hpsdr.org">hpsdr@lists.hpsdr.org</a>
</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Saturday,
September 13, 2008 5:22 PM</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> [hpsdr]
Atlas Impedance Measurements</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:12.0pt;margin-left:
35.4pt'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>*****
High Performance Software Defined Radio Discussion List *****</span></font></p>
<div class=MsoNormal align=center style='margin-left:35.4pt;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>which layer stackup was used for the
boards for which the impedance and TDR measurements were made?</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I could not find any specification.</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I ask this question because I
found signal integrity issues on the clocklines. </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>73, Gerd</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>DJ8AY</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
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size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>_______________________________________________<br>
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<p class=MsoNormal style='margin-left:35.4pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
No virus found in this incoming message.<br>
Checked by AVG - http://www.avg.com <br>
Version: 8.0.169 / Virus Database: 270.6.21/1668 - Release Date: 9/12/2008 6:56
AM</span></font></p>
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