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LF: Dipole antenna at LF

from [Talbot Andrew] [Permanent Link][Original]
To: "LF Group \(E-mail\)" <[email protected]>
Subject: LF: Dipole antenna at LF
From: "Talbot Andrew" <[email protected]>
Date: Thu, 18 Jan 2001 11:31:50 -0000
Reply-to: [email protected]
Sender: <[email protected]>
A new subject now .....
 
Someone must have already tried this, but how effective would a (say) 100m long dipole laid down a chalk hill be ?
Isn't limestone also the same material as chalk,   Are there any CREG members reading this who know about conductivity of rocks?
Chalk is a very poor conductor, even when wet.   A 4m earthing rod driven into the top of Portsdown Hill on the South coast of the UK in an attempt to make an RF ground  measured 120 ohms to mains Earth - attempt abandoned in favour of a dipole !
 
There are plenty of chalk hills of this sort of height, and the amount of wire needed - 500m perhaps - means the radiation resistance will rise to an acceptable figure to reduce copper loss.  
 
Andy  G4JNT
 
 


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