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From: Dimitrios Tsifakis <dtsifakis@gmail.com>
Date: Fri, 8 Feb 2019 09:15:10 +1100
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To: rsgb_lf_group@blacksheep.org
Subject: Re: ELF: Carrier on 22.97 Hz
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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 <selberdenken@posteo.de> 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
>