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<DIV><FONT face=Arial size=2>Sorry to get picky, but a Faraday shield is not an
electromagnetic field, it is an electrostatic shield. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>An rf tight room needs the edges fully bonded
together and a Faraday shield requires that they be insulated. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I think everyone knows what is being said, but I
felt obliged to add the detail. </FONT></DIV>
<DIV> </DIV>
<DIV>John Ferrell <BR>My Competition is not my enemy! <BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 22, 2004 1:06
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Measuring Surface Flatness
(was "Cabinet Grade Particle Board")</DIV>
<DIV><BR></DIV>
<DIV>That's what it is. No RF gets in or out. Something like 110dB
attenuation.</DIV>
<DIV> </DIV>
<DIV>Bob.</DIV>
<DIV><BR><BR><B><I>Bill Glaze <<A
href="mailto:billglaze@triad.rr.com">billglaze@triad.rr.com</A>></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Bob:<BR>Do
I recall when such a room as you describe was known as a "Faraday
Cage?" Or am I having one of RvP's "Senior Moments?" (No
offense, Ron!<SPAN class=moz-smiley-s14><SPAN> O:-) </SPAN></SPAN>) <BR>Bill
Glaze<BR><BR>Bob Richards wrote:<BR>
<BLOCKQUOTE cite=mid20041119184334.15900.qmail@web12407.mail.yahoo.com
type="cite">
<DIV>The ideal material I have seen is used in RF shielded room walls. It
is 3/4" high-density particle board, skinned with galvanized steel on both
sides, maybe 28ga. Very flat, and very smooth. It will bow just a little,
maybe 1/2 inch at the most, when you pick it up from the end. Came in 4' x
12' as I recall. Don't have any idea where you could purchase it at a
reasonable cost. I was hoping they would have a sheet of it leftover when
they built one of the chambers where I used to work, but they
didn't.</DIV>
<DIV> </DIV>
<DIV>Bob Richards.</DIV>
<DIV><BR><BR><B><I>John Ferrell <A class=moz-txt-link-rfc2396E
href="mailto:johnferrell@earthlink.net"><johnferrell@earthlink.net></A></I></B>
wrote:</DIV>
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<DIV><FONT face=Arial size=2>The test for a Pool Table is to put a
straight edge across it and try to slide a dollar bill under
it.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>BTW, I am surprised to hear the talk about
using pins. One of the first things Dave Guerin taught me was to use
masking tape instead!</FONT></DIV>
<DIV> </DIV>
<DIV>John Ferrell <BR>My Competition is not my enemy! <BR><A
href="http://dixienc.us/">http://DixieNC.US</A><BR></DIV>
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<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal">-----
Original Message ----- </DIV>
<DIV
style="BACKGROUND: rgb(228,228,228) 0% 50%; FONT: 10pt arial; font-size-adjust: none; font-stretch: normal; moz-background-clip: initial; moz-background-origin: initial; moz-background-inline-policy: initial"><B>From:</B>
<A title=MGrabowski@fmtinv.com
href="mailto:MGrabowski@fmtinv.com">Mark Grabowski</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>To:</B>
<A title=discussion@nsrca.org
href="mailto:%27discussion@nsrca.org%27">'discussion@nsrca.org'</A>
</DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Sent:</B>
Friday, November 19, 2004 11:21 AM</DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Subject:</B>
Measuring Surface Flatness (was "Cabinet Grade Particle Board")</DIV>
<DIV><BR></DIV>
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<P><FONT size=2>We've seen some great ideas from several folks.
However, a common element to this discussion is that you need to
measure how flat the surface winds up. What tricks are you guys using
to actually measure how flat the surface is of the bench you just
built?</FONT></P><BR></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE><BR><BR>Bob
Richards<BR>bob@toprudder.com<BR>http://www.toprudder.com</BLOCKQUOTE></BODY></HTML>