Message-ID: <4DF11A78.4020401@iup.uni-heidelberg.de>
Date: Thu, 09 Jun 2011 21:09:44 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
CC: Paul <paul@abelian.netcom.co.uk>, Bernd Grupe <bernd.grupe@t-online.de>
Subject: VLF: First tests on VLF at DK7FC in Heidelberg
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VLF,

Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in 
Heidelberg,  
http://no.nonsense.ee/qthmap/?qth=JN49IK00WG&from=jn49ik00WD It is about 
30m up.

I'll start doing some resonating tests and may come on air in the 
afternoon. The small PA (max. 300W) will be used in this first test 
since it is easier to manage. Maybe the resonance will be some kHz 
higher but i hope to come down into the Dreamers Band (TM).

I expect to be visible on "local" grabbers like DF6NM, OE3GHB and 
OK2BVG. If all works well i plan to transmit a longer dash, maybe 6000 
seconds and later a short message in DFCW-600, like "K" or so, just for 
the proof and to get a first impression about the efficiency of this 
antenna.

I had the idea to buy some flexible aluminium tube to form a toroid that 
will be placed on the top of the coil. Tis reduces the maximum E field 
and adds some C, that might be needed to come down to 8970 Hz...

Of course all this depends on the absence of rain but now i don't need 
wind! Therefore, the signals will be about 20 dB lower, probably.

The signal will be overload my grabber 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html 
that is in about 20 m (!) distance. Hopefully it gets not damaged due to 
several 10 kV on the wire.

Is there someone who will watch for that signal?

Reports would be very apprechiated!

73, CU, Stefan/DK7FC