Return to KLUBNL.PL main page

[Top] [All Lists]

Re: LF: Off topic

To: [email protected]
Subject: Re: LF: Off topic
From: brian hodgson <[email protected]>
Date: Thu, 10 Mar 2005 19:48:26 +0000 (GMT)
In-reply-to: 6667
Reply-to: [email protected]
Sender: [email protected]
Hi Dick
Looking in my trusty "Reference Data for Radio Engineers" (won in a rally raffle at least 40 years ago !) the spark gap voltages chart indicates about 30 kV per inch for "needles" and between 55 and 80 kV for spheres spaced and inch apart (depending on the size of the spheres). Hope that helps.

Dick Rollema <[email protected]> wrote:
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

Send instant messages to your online friends

<Prev in Thread] Current Thread [Next in Thread>