LF: Dipole antenna at LF

["Talbot Andrew" <ACTALBOT@dera.gov.uk>]

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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