Re: LF: RE: VLF QRP Earth mode: 5.1km DX tonight but no such thing as a free lunch

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Rik, Roger, VLF,

What i want to try is to "couple" two rivulets that are running down on different sides of a mountain. Each one could act as a conductor regarding the different conductances of water and stones. On the top of the hill the rivulets are thinner, so a short cut effect could be reduced. But currently the QRN is very strong and so this could take some time until i reach my 5 km distance...

73 and have fun,

Stefan/DK7FC


Am 23.06.2010 09:15, schrieb Rik Strobbe:

Yet another thought:

 

salt water is a rather good conductor.

What about a couple of rods into the sea near Dover and another pair near Cap Griz Nez ?

Distance is 34 km.

 

73, Rik  ON7YD

 

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Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Rik Strobbe [Rik.Strobbe@fys.kuleuven.be]
Verzonden: woensdag 23 juni 2010 9:00
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: RE: VLF QRP Earth mode: 5.1km DX tonight but no such thing as a free lunch

1. At greater distances (3-5kms) the signal reaches its destination by conduction through the ground aided by pipes in the roads and with inductive coupling into the loop at the RX.

Roger,

 

very interesting.

There are huge gas pipelines running across the country (and even across Europe).

I wonder how far one would get with a ground antenna near one of these.

The 2 rods of the ground antenna each at one side of the pipeline would give optimal coupling.

 

73, Rik  ON7YD