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From: "dj9dw" <dj9dw@t-online.de>
To: rsgb_lf_group@blacksheep.org
References: <6.1.0.6.2.20050310191314.02805c70@mail.casema.nl>
Date: Thu, 10 Mar 2005 21:09:59 +0100
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Subject: LF: Re: Off topic
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<DIV><FONT face=Arial size=2>Hello Dick,</FONT></DIV>
<DIV><FONT face=Arial size=2>between a peak and a plate it takes 1 
kV.</FONT></DIV>
<DIV><FONT face=Arial size=2>Between two balls ( diameter?) - spheres - abt 3 
kV.&nbsp; per mm. Don't ask me for kV/m.</FONT></DIV>
<DIV><FONT face=Arial size=2>73 Peter, dj9dw.</FONT></DIV>
<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=dickrollema@casema.nl href="mailto:dickrollema@casema.nl">Dick 
  Rollema</A> </DIV>
  <DIV style="FONT: 10pt arial"><B>To:</B> <A title=rsgb_lf_group@blacksheep.org 
  href="mailto:rsgb_lf_group@blacksheep.org">LF-Group</A> </DIV>
  <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 10, 2005 7:25 
  PM</DIV>
  <DIV style="FONT: 10pt arial"><B>Subject:</B> LF: Off topic</DIV>
  <DIV><BR></DIV>TYo All from PA0SE<BR><BR>I am presently writing an article for 
  our VERON magazine <I>Electron&nbsp; </I>on the early radio experiments by 
  Marconi. In these experiments spark gaps played an important role. Because I 
  would like to perform some simple calculations on the peak power radiated by a 
  spark transmitter I am looking for data on the break down voltage of spark 
  gaps, consisting of two spheres.<BR>In literature, found on the Internet, 
  75kV/inch is quoted but it is not stated whether this is between points or 
  spheres and that makes a lot of difference.<BR>Temperature and air pressure 
  also influence break down voltage but I will forget about that, reckoning with 
  "normal" conditions&nbsp; of, <BR>say , 20 degrees centigrade and&nbsp; 1000 
  hectopascal or whatever as reckoned as standard&nbsp; barometric pressure. 
  <BR>Your help will be very much appreciated.<BR><BR>73, Dick, PA0SE<BR>JN22GD 
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