Message-ID: <4CD54820.5030804@iup.uni-heidelberg.de>
Date: Sat, 06 Nov 2010 13:20:48 +0100
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: OE5ODL on VLF
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Wow! Congratulations to this successful start up on VLF!

If i understand it correctly you have used the fence as the antenna, so 
a kind of earth antenna or ground dipole? Have you measured antenna 
currents or so? :-)

Will Ossi use his LF TX antenna for VLF too? :-)

It's very pleasing to see this band is coming slowly alive :-)

73 and good luck!

Stefan/DK7FC



Am 06.11.2010 10:23, schrieb Gerhard Hickl:
> Dear group!
>
> After weeks of testing and playing around with different kind of
> equipment and antennas, Ossi OE5ODL has managed to transmit a signal on
> VLF which is received by his grabber www.langwelle.at
>
> It all started when we connected an car audio amplifier over a
> toroid-transformer to two big fences out in the wood some weeks ago.
> The purpose just was to see if we could transmit anything with this kind
> of equipment. We archived about 100W of input power but nearly no signal
> was radiated.
>
> Since this time, Ossi has constantly improved his setup and yesterday
> for the first time saw his signal on his grabber about 10km away from
> his home QTH.
>
> He is using his LF-antenna (20m vertical) with additional top-loads to
> get a capacity of about 1200pf. The antenna is matched with some
> different coils in series and for sure there is still a lot room for
> improvements on the TX as well as on the RX setup. The power amplifier
> is a car-audio equipment, antenna input is up to 250W.
>
> I think this is the first noticeable signal on VLF radiated by an
> amateur in OE...
>
> Congrats to Ossi
>
> 73
> OE3GHB
> Gerhard
>
>
>
>
>
>