Article View: sci.electronics.design
Article #925Re: An unusual Oscilloscope phenomenon
From: Michael A. Terrell
Date: Fri, 26 Jun 2009 15:40
Date: Fri, 26 Jun 2009 15:40
19 lines
2362 bytes
2362 bytes
John Larkin wrote: > > At the receive (instrument) end, the ungrounded end of the coax shield > becomes the hot side of a resonant "vertical" antenna. Any voltage > there becomes 100% common-mode signal on the inner twisted pair. > > What's wrong with a little current in the shield? The signal pair > isn't affected. But volts, or tens of volts, of common-mode RF can be > nasty. That's the reason you see lots of six inch wide copper bonding straps in radio studios. They use one and a half inch straps to connect between the equipment, and the bonding straps. -- You can't have a sense of humor, if you have no sense!
Technical Details
Message-ID:
<4A44EBDD.4974B2B@earthlink.net>Path:
arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!backlog2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mailReferences:
<h8B0m.53620$FI5.3564@newsfe12.iad> <C5D0m.1651$vO4.300@flpi145.ffdc.sbc.com> <n41645hvv4ia1uqa1cnbriilvg4vg1td2a@4ax.com> <z_udncS2Q9vvJd7XnZ2dnUVZ_odi4p2d@supernews.com> <u4k745pit2pm2qep1k9apmcgda9ugb1uqe@4ax.com>Show Full Headers
Complete Article Headers
X-Google-Thread: a5a6238865,2fb4482ba391e6 X-Google-Attributes: gida5a6238865,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!backlog2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 26 Jun 2009 10:40:15 -0500 Message-ID: <4A44EBDD.4974B2B@earthlink.net> Date: Fri, 26 Jun 2009 11:40:13 -0400 From: "Michael A. Terrell" <mike.terrell@earthlink.net> Organization: http://home.earthlink.net/~mike.terrell/index.html Skype: michael.a.terrell Flikr: http://www.flickr.com/photos/materrell/ X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: An unusual Oscilloscope phenomenon References: <h8B0m.53620$FI5.3564@newsfe12.iad> <C5D0m.1651$vO4.300@flpi145.ffdc.sbc.com> <n41645hvv4ia1uqa1cnbriilvg4vg1td2a@4ax.com> <z_udncS2Q9vvJd7XnZ2dnUVZ_odi4p2d@supernews.com> <u4k745pit2pm2qep1k9apmcgda9ugb1uqe@4ax.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NewsProxy: 1.2.5 Lines: 19 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 24.110.34.161 X-Trace: sv3-wE4RKteIFzIJsrf+AJSIsJHc4DAO/Em4LvpSFf/y/nmSN+H/n3sOulJdtGv29uFiA3R9R1sR48/+LVW!W5jkNTEtEqJwsZu5xZqFVbhZEjj6fY1GgDFsdAZNJv+MxTSNiPDbs1gr5eSitLO1BWzH+ApzxyBX!+XIFmZVNEIdMm8IxIA== X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.39 X-Original-Bytes: 2110