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Date: Thu, 09 Jun 2011 20:35:44 +0100
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Subject: Re: VLF: First tests on VLF at DK7FC in Heidelberg
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Hi Stefan

I am back at the HQTH and will be monitoring for you. What time will you=20
start the resonating tests? if needed I will leave my Grabber on=20
overnight. I cannot guarantee to be up at 0300 with the bird song as I=20
was this morning:-)

BTW I am monitoring 136kHz Views on my Grabber now.

73 Eddie G3ZJO

On 09/06/2011 20:09, Stefan Sch=E4fer wrote:
> VLF,
>
> Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in=20
> Heidelberg, =20
> http://no.nonsense.ee/qthmap/?qth=3DJN49IK00WG&from=3Djn49ik00WD It is=20
> about 30m up.
>
> I'll start doing some resonating tests and may come on air in the=20
> afternoon. The small PA (max. 300W) will be used in this first test=20
> since it is easier to manage. Maybe the resonance will be some kHz=20
> higher but i hope to come down into the Dreamers Band (TM).
>
> I expect to be visible on "local" grabbers like DF6NM, OE3GHB and=20
> OK2BVG. If all works well i plan to transmit a longer dash, maybe 6000=20
> seconds and later a short message in DFCW-600, like "K" or so, just=20
> for the proof and to get a first impression about the efficiency of=20
> this antenna.
>
> I had the idea to buy some flexible aluminium tube to form a toroid=20
> that will be placed on the top of the coil. Tis reduces the maximum E=20
> 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=20
> wind! Therefore, the signals will be about 20 dB lower, probably.
>
> The signal will be overload my grabber=20
> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html=20
> that is in about 20 m (!) distance. Hopefully it gets not damaged due=20
> 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
>
>