Re: ELF: ELF!

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Good luck Stefan.

It will be most interesting to see how far you can get without the assistance of "utilities conduction" as was the case with my own small tests in the summer.  If my understanding is right you have to get beyond about 25km to be in the far field at this sort of frequency, so reception at 40km is a good target. I wonder if the effective loop size (in the ground) increases because of the increasing skin depth and signal penetration? If so, the results might be better than expected.

I can look at these frequencies with the kit I've already used, but doubt I'd see anything.

73s
Roger G3XBM

2010/9/2 Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>

Dear LF/VLF,

Am 01.09.2010 19:43, schrieb mal hamilton:

Miracles are possible but impossibilities take a little longer.

Yes. Thus is just want to announce some tests on ELF, probably arround 2 kHz. First i set up a grabber window for ELF, still with the VLF active antenna. I will built an ELF active antenna soon (some weeks). First tests will be done with the earth antenna (5 km), later i plan to reach 40 km with the 200m or 300m antenna (using some parallel Cs or even a mains HV transformer?). Maybe some interesting effects will come up... Distances will most probably not reach to UK or so but who knows (before some weeks, no one belived that it is possible to reach almost 50 km with an earth antenna at moderate TX power).

Will there be any interested OMs for that project?


73, Stefan/DK7FC

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