Message-ID: <001901cc2743$81695dc0$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4DF11A78.4020401@iup.uni-heidelberg.de>
Date: Fri, 10 Jun 2011 08:53:36 +0100
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Subject: LF: Re: First tests on VLF at DK7FC in Heidelberg
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Stefan
I will leave my monitor on 8970 DFCW 600 mode. If I detect your signal I
will reply on 137.7 CW or QRS3.
73 De Mal/G3KEV

----- Original Message -----
From: "Stefan Sch=E4fer" <schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Cc: "Paul" <paul@abelian.netcom.co.uk>; "Bernd Grupe"
<bernd.grupe@t-online.de>
Sent: Thursday, June 09, 2011 8:09 PM
Subject: VLF: First tests on VLF at DK7FC in Heidelberg


> VLF,
>
> Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in
> Heidelberg,
> http://no.nonsense.ee/qthmap/?qth=3DJN49IK00WG&from=3Djn49ik00WD It is ab=
out
> 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
>