Re: VLF: New test

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

On Sun, 27 Jun 2010, Horst Stöcker wrote:

> yesterday I tried to reproduce Rogers experiments with VLF transmissions 
> over the local gas and water mains. I connected one wire to the 
> equipotential busbar of my house. The other wire is connected to a 60cm 
> copper rod in about 15m distance in the garden - very similar to Rogers 
> setup. I measured about 180 ohm DC. I tried different frequencies below 
> 9kHz with an audio transformer. The "walk around" reception was very 
> disappointing, just a few meters.
[...]

theoretically you could try a analogue phone line (of course always ask 
for premission etc). one of the wires are grounded at the "remote module" 
(or whatever it's called), or the phone exchange (it you're lucky). this 
gives you at least a few hundred meters of wire. the 0 line of the power 
lines might also be fun if you live a long way from the transformer, and 
the 0 line is not grounded somewhere near.
coupling to commercial structures is fun :)
http://acid.ch.pw.edu.pl/~sq5bpf/ham/vlf_beacon20090711/vlf_sggw_rosola.jpg 
(a bit below 8900kHz, distance abt 550m)
VY 73

Jacek / SQ5BPF