Re: VLF: 8970Hz and 8970.022

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

Hi Henny, Chris, VLF

Am 27.03.2012 19:20, schrieb Chris Dillon:

[...]

Henny - your signal is stronger with me now - putting the coil outside seems to be working.

Yes, here too. I wasn't sure if i actually saw your signal Henny. But now it becomes more probably.
There are propagation effects on our 397 km distance, diurnal QSB. I lost your trace at arround 12 UTC. It was visible in 424 uHz. A frequency shift of some few mHz would really help to identify your signal. But you would have to use SpecLab for that and use a locked sampling rate for this. It can be done by using a small ferrite antenna, resonated to GQD. If you use an audio amplifier it would be an easy procedure.

450 mA. Where do you measure this current? In the cold end of the coil or outside the house? I remember you have had 450 mA for a longer time now but its the first time we can see your signal so well. Maybe a significant part of that current was flowing back to earth before passing the radiation resistance. Then, the actual antenna current is now 450 mA while it was say 200 mA where the coil was inside.
How much L did you have to add to come to resonance again, when the coil was placed outside?

73, Stefan/DK7FC