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Date: Tue, 05 Feb 2019 10:02:20 +0100
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Subject: VLF: in VK?
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Hi Dimitris,

Am 04.02.2019 06:54, schrieb Dimitrios Tsifakis:
> [...] and pity you are not
> closer otherwise [...]
Indeed. Otherwise we could do some VLF experiments together, maybe in 
that desert close to the sea: 
https://www.youtube.com/watch?v=XfR9iY5y94s :-)


Am 05.02.2019 01:16, schrieb Dimitrios Tsifakis:
> Hi Stefan,
>
> I am working on both making a portable VLF magnetic field antenna
> (tuned) and a transmit antenna which perhaps will be better than the
> existing 120 m by 3 m (average height) loop. The resistance of this
> loop isn't stellar (about 11 ohm DCR) and half of it is aluminium
> welding wire. Anyway, it's there and it is my reference antenna.
It could be a good RX antenna for VLF. Did you try to connect a 
soundcard of a notebook and record something or produce a spectrogram?
You know there is Edgar from Tasmania, most probably already following 
the conversation and hoping to receive something of you :-)

>   The
> new loop antenna will be better but it is still under construction.
> Heavy copper cabling is surprisingly difficult to put up in the air
> with limited resources. Anyway, once all that is in place, I will do
> some local tests (without rubidium or GPS locked oscillators) and
> we'll take it from there. My QTH locator is QF44OX (very close to
> QF44nx). I have plenty of space but it's undulating and kangaroos
> always make a mess with low hanging wires!
>    
Wow, exciting! So the RX is in QF44OX and the TX is in QF44NX?
If you have plenty of space, it may be easier to improve the ERP by 
building a larger loop out of thin wire instead of a 'small' one out of 
heavy wire. Maybe you can even bury the wire to avoid collisions with 
kangaroos.

> Is there a web page with your 8270 Hz experiments? I'd love to read up
> a bit of inspiring material of what others have achieved as it can be
> quite lonely doing experiments like that where I am. How much radiated
> power have you achieved?
>    
I must admit that i do not have my own homepage with up to date overview 
of my VLF experiments. There is a list maintained by Paul Nicholson 
giving an impression of what has been done lately on VLF/ULF: 
http://abelian.org/vlf/amateur-radio/
A web page of these experiments would be very large and you could read 
for hours. But i'm rather lazy writing it up, unfortunately. I'm rather 
the one who puts time into winding coils!!! ;-)
Actually the whole story of all experiments is spread over the emails of 
this reflector.

Your next well prepared VLF RX station is Edgar J.T. in QE37PD, see 
http://k7fry.com/grid/?qth=QF44OX&from=QE37PD
With a well prepared loop, it is not unlikely at all to leave a trace on 
his site! The distance is just like the distance between me and Paul 
Nicholson.

But at the moment you are doing some first steps and there are some more 
to be done until you reach that distance. But it is really doable!
At the transmitter site, do you have electricity or do you transmit from 
batteries?
What is the power level?
Can you (temporarely) lay out a wire from here to there: 
http://k7fry.com/grid/?qth=QF44NX86FC&from=QF44NX73XQ :-) This is a good 
length and if configured to a loop, it would point perfectly towards 
Edgar. A simple loudspeaker cable of 0.75mm2 would be fine. And you will 
need some ground rods at the ends.

Sorry, that was maybe a bit much of input :-)
What do you think?

73, Stefan