Earth probes not suitable for DX but good for cave exploration, looking for
Bats and the Loch Ness Monster
g3kev
----- Original Message -----
From: "John Rabson" <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 12, 2011 8:07 AM
Subject: Re: LF: noise on VK and earth dipole tests
hi Dimitrios,
On 11 Oct 2011, at 23:37CEST, Dimitrios Tsifakis wrote:
> ...
> By the way, has anyone in the group experimented with transmitting
> into the ground with earth probes? It seems to be working reasonably
> well here, in fact I have been thinking that it's comparable to my
> very limited inverted-L LF antenna...
>
> http://people.physics.anu.edu.au/~dxt103/136/earth/
>
Amongst other things, it depends on the geology. G3XBM has managed 5.6 km
with 5 W RF at very low frequency. On 87 kHz with 4W SSB (cave radio) in
limestone, the best I know of is 1.6 km two way and 2.5 km one way in the
French alps.
It is always worth trying.
John F5VLF
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