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Re: LF: noise on VK and earth dipole tests

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: noise on VK and earth dipole tests
From: Stefan Schäfer <[email protected]>
Date: Sat, 15 Oct 2011 18:53:17 +0200
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Hi John,

Yes, the more the better.
If it is just one rod and the overall losses would be 450 Ohm, i expect a high ground conductivity which would be worse for an earth antenna... Maybe the elevated wire in the forest is the best (and long lasting) antenna system for /p. Then it must be a closed loop (and Scott and others use) or a looong earth antenna or just a full size dipole, lossy but full size :-) Some dry old and tall trees would be excellent, even as an insulator ;-) 

73, Stefan

Am 15.10.2011 18:43, schrieb John Rabson:

On 15 Oct 2011, at 14:14CEST, Stefan Schäfer wrote:


Hello Dimitris,

I think the 450 Ohm you get is mostly caused by the earth electrode resistance. 
So if you spend e.g. 2 instead of one earth rod, maybe you can get a 3 dB 
improvement?

The more the better up to 6 or 7 rods.
> From cave radio tests we find that the earth rods need to be spaced by 2 or 
more times their depth.

John F5VLF
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