<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 <billglaze@triad.rr.com></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