Message-ID: <5C5C5757.5080906@posteo.de>
Date: Thu, 07 Feb 2019 17:05:43 +0100
From: DK7FC <selberdenken@posteo.de>
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: ELF: Carrier on 22.97 Hz
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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 
<https://en.wikipedia.org/wiki/Radio_spectrum#ITU> ) 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


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Hi ELF ;-)<br>
<br>
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, <a
 href="https://en.wikipedia.org/wiki/Radio_spectrum#ITU">ITU radio band
1</a> ) for the first time ever.<br>
<br>
Here are the parameters: <br>
<br>
TX frequency: <b>22.970 Hz</b><br>
Wavelength of that frequency: <b>13060 km</b><br>
Antenna voltage: <b>4.8 kV rms</b> (+ a DC component of 7.5 kV)<br>
Antenna current: <b>325 uA</b> <br>
ERP: 600 aW, or <b>6E-16 W</b><br>
<br>
Call it QRP!<br>
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.<br>
<br>
A spectrogram which is centered on the frequency of interest in now
shown at
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html</a>
(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...<br>
<br>
73, Stefan<br>
<br>
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