Re: LF: earth antenna test

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Hi Dimitris,

Thank you for publishing your results. Most interesting. What sort of power 
does your antenna analyser put out?

Can you remind us what sort of soil/rock geology you have there? It sounds like 
it may have similar properties to mine here where the 2 earth rods separated by 
20m look close to 60 ohms resistive. 

Here, I have not tried wires on the ground unterminated although I can only 
manage 15-20m max in my small garden. 

This week I hope to measure my 137kHz field strength from my earth-electrode 
antenna and 8W beacon at about 10km (to get ERP) by comparing the level against 
the strong Greek commercial signal near the band which I am told is about 1mV/m 
in the UK. 

We have lots to learn still about earth antennas!

73s and thanks

Roger G3XBM 



On 23 Jan 2013, at 04:42, Dimitrios Tsifakis <dtsifakis@gmail.com> wrote:

> Hello group,
> 
> here is a quick test I did on 475 kHz, using some wires laying on the
> ground. I was really impressed by the signal strength but capturing
> the signal from my AA-30 antenna analyser surely takes the cake :-)
> 
> http://people.physics.anu.edu.au/~dxt103/136/earth/6/
> 
> Happy to hear your comments on this test.
> 
> 73, Dimitris VK1SV
>