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Date: Wed, 04 May 2011 14:06:57 +0100
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Subject: Re: LF: G3ZJO grabber
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Hello Stefan

I was prompted to take a look 'down low' a couple of weeks ago when=20
SM5LE said, look 'Schumann resonances'. You will be surprised that I am=20
using your E-Probe, unmodified. I wasn't expecting to see much so I was=20
surprised by the results.
Have I seen Schumann resonances? I am not going to say, proof needs time=
=20
of observation.

Information about the signals and phenomena down there is scarce, I have=
=20
heard mention of 90Hz for submarine comms so many thanks for the link I=20
have removed my LPF and shifted the window up to take a look on 82Hz.

EDIT
Carrier at 80.2Hz, 75.2Hz and 64.24Hz which would seem to be a harmonic=20
of the 32Hz and likewise the 16Hz a sub harmonic of 32Hz.

My searches for information have certainly taken me to Renato's page, I=20
was showing a link to his site as a 8.9kHz Grabber, since looking at his=
=20
site I have moved him into a Link class of his own.

There have been questions about the pulses of interference at ULF. When=20
we look at our VLF Wide displays the Sferics seem to peter out around=20
3kHz, (your filter is doing its job). However I have used the 0....50Hz=20
view to prove to my own satisfaction that Sferics are still going strong=
=20
down to 0Hz. Probably removing the 3kHz cut of would cause havoc down ther=
e.

There are several carriers of unknown origin, maybe due to my urban=20
location which I can investigate. Any thoughts of what runs at 32Hz=20
would be welcome, I am pretty sure it comes down from the antenna. Well,=
=20
when there are no tests on 8.9kHz I can keep interested.

73 Eddie

On 04/05/2011 12:14, Stefan Sch=E4fer wrote:
> Hello Eddie, VLF,
>
> Your additional grabber windows are interesting. Remembers me to the=20
> site of Renato Romero ;-)
> What antenna do you use for displaying the range of 0...50 Hz? My=20
> probe circuit has a high pass filter with an edge frequency of about 3=
=20
> kHz. So if your QRM below 3 kHz is not to strong, you may remove that=20
> and get better signals on ELF. Have you ever received the ZEVS at 82=20
> Hz? http://www.vlf.it/zevs/zevs.htm
>
> 73, Stefan/DK7FC
>
>