Message-ID: <4DF207EF.5060700@iup.uni-heidelberg.de>
Date: Fri, 10 Jun 2011 14:02:55 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.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>
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Subject: Re: LF: Re: First tests on VLF at DK7FC in Heidelberg
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Hello Mal, VLF,

OK, i am actually RX QRV on LF all the time here. And i have internet=20
during the test! :-)

Now, the coil is on the roof and it's dry. I will prepare now... Maybe=20
the first VLF antenna current in a 20 minutes...

73, Stefan/DK7FC


Am 10.06.2011 09:53, schrieb mal hamilton:
> 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
>
>
>   =20
>> 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 a=
bout
>> 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
>>
>>     =20
>   =20