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Date: Wed, 12 Oct 2011 12:35:53 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: noise on VK and earth dipole tests
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Hi Dimitris,

Sorry, have lost your mail in the large ammount of mails yesterday ;-)

Am 11.10.2011 23:37, schrieb Dimitrios Tsifakis:
> Hi Stefan,
>
> Last two or three days have been rather noisy, yesterday I had to turn
> down the volume of the receiver as the static was reaching annoying
> levels. But hey, transmitting _is_ fun and I am sure you will have
> plenty of reception reports, even if you don't make it to VK this
> time.
>
> I am so jealous of the amateur density in Europe and the level of
> activity over there on LF
Yes, it's great here ;-) And the number of grabbers too! Very 
interesting countries and locations. But the activity is extending, see 
TF3Hz or 4X1RF. The covered area increases.
> - here, I need to drive to my country block
> to set up my transmitter, transmit, then go back home to check the
> received signal in my grabber!
>    
Reminds me on local LF experiments. But even on 8970 Hz i have 38 
confirmed receptions, see 
http://dl.dropbox.com/u/19882028/VLF/VLF_11th_all.png
> By the way, has anyone in the group experimented with transmitting
> into the ground with earth probes?
Yes, G3XBM, others and me. I have a 700m long "earth antenna". The 
electrode pairs are 600m distant. Average height above ground is about 
6m (2...10m). I was received in 46 km distance at 8970 Hz in DFCW-600 
(Michael Oexner) and about 450 km in QRSS-3 on 137.7 kHz (F5WK). G3KEV 
also reported about traces of my transmission on LF. He is 830km 
distant. I used 100W RF power.

Well, on VLF it is a pure earth antenna but on LF it must be a mixture 
of that and a low short wire above ground.
I haven't done excessive experiments on LF, like finding the radiation 
pattern and so. Maybe that would be interesting.

If you have a region with plenty space, you must try a loong baverage to 
EU please :-) You could also use that for TXing whithout expecting too 
much of course, just for the fun. Can you arrange a 3 Lambda wire in VK? :-)
>   It seems to be working reasonably
> well here, in fact I have been thinking that it's comparable to my
> very limited inverted-L LF antenna...
>
> http://people.physics.anu.edu.au/~dxt103/136/earth/
>    
Very nice site. Nice to see that there are crazy people like me all over 
the world :-)

What are your plans and who is the next distant LF station to you? How 
many amateurs can radiate a 1 W ERP signal in VK, do you know?

Vy 73 and good luck in your experiments!

Stefan/DK7FC