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LF: Re: Off topic

To: [email protected]
Subject: LF: Re: Off topic
From: "dj9dw" <[email protected]>
Date: Thu, 10 Mar 2005 21:09:59 +0100
References: <[email protected]>
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Hello Dick,
between a peak and a plate it takes 1 kV.
Between two balls ( diameter?) - spheres - abt 3 kV.  per mm. Don't ask me for kV/m.
73 Peter, dj9dw.
----- Original Message -----
Sent: Thursday, March 10, 2005 7:25 PM
Subject: LF: Off topic

TYo All from PA0SE

I am presently writing an article for our VERON magazine Electron  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.
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.
Temperature and air pressure also influence break down voltage but I will forget about that, reckoning with "normal" conditions  of,
say , 20 degrees centigrade and  1000 hectopascal or whatever as reckoned as standard  barometric pressure.
Your help will be very much appreciated.

73, Dick, PA0SE
JN22GD
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