Hi Stefan,

that's insane! What's the purpose of the DC offset of 7.5 kV?  Is the
antenna tuned (unlikley) or you are just applying the volts from a
voltage amplifier?

Hope the antenna is well insulated from people and nature as skin
effect won't save your bacon (unlike the higher frequencies).

73, Dimitris VK2COW

Στις Παρ, 8 Φεβ 2019 στις 3:10 π.μ., ο/η DK7FC <[email protected]> έγραψε:
>
> Hi ELF ;-)
>
> I'm glad to announce that since 15:46 UTC i am transmitting on ELF (the real 
> ELF, i.e. into the range of 3...30 Hz, ITU radio band 1 ) for the first time 
> ever.
>
> Here are the parameters:
>
> TX frequency: 22.970 Hz
> Wavelength of that frequency: 13060 km
> Antenna voltage: 4.8 kV rms (+ a DC component of 7.5 kV)
> Antenna current: 325 uA
> ERP: 600 aW, or 6E-16 W
>
> Call it QRP!
> The goal is to detect the signal on my 3.5 km distant tree grabber, whose E 
> field is now working again. Since the E field probe is not to far above the 
> tree, the effective height is not as much as it should ideally be, at this 
> frequency, so the RX is somewhat deaf. Anyway i can see the Schumann 
> resonances and the 60 Hz power grid. So i hope it will work.
>
> A spectrogram which is centered on the frequency of interest in now shown at 
> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html (3rd 
> window). But maybe 424 uHz FFT bin width is even to optimistic! In a few 
> minutes we'll see more :-) It takes about 40 minutes until a peak could have 
> fully developed...
>
> 73, Stefan
>