DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        b=e1E7nSYiT+hm5h8dmOQtll63DyFvc3YIJioN9dOB5lENVsHjASpI8mINtzGGY66zCk
         mLjD6swUC2qi3z1Q1fTKu+yvpUKQ1YCgkx3gEWSXrQCR0g+9tF4ujGY20VAKOJ3M2IHh
         m3KVLPpCDaROtlZW8+7gmsS5VkR9iJCplblsY=
MIME-Version: 1.0
In-Reply-To: <4DF11A78.4020401@iup.uni-heidelberg.de>
References: <4DF11A78.4020401@iup.uni-heidelberg.de>
Date: Thu, 9 Jun 2011 23:36:19 +0100
Message-ID: <BANLkTimvDM1UmJRXiDxcP_gG37_PXBzGeA@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: VLF: First tests on VLF at DK7FC in Heidelberg
Content-Type: multipart/alternative; boundary=001636e0b17efbaefe04a54f14d7
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--001636e0b17efbaefe04a54f14d7
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Good luck Stefan. Unable to monitor this weekend unfortunately.

73s
Roger G3XBM

2011/6/9 Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>

> 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=3Djn49ik=
00WDIt 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 ho=
pe
> 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 an=
d
> 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 an=
d
> 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 sever=
al
> 10 kV on the wire.
>
> Is there someone who will watch for that signal?
>
> Reports would be very apprechiated!
>
> 73, CU, Stefan/DK7FC
>
>


--=20
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/

--001636e0b17efbaefe04a54f14d7
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Good luck Stefan. Unable to monitor this weekend unfortunately.<br><br>73s<=
br>Roger G3XBM<br><br><div class=3D"gmail_quote">2011/6/9 Stefan Sch=E4fer =
<span dir=3D"ltr">&lt;<a href=3D"mailto:schaefer@iup.uni-heidelberg.de">sch=
aefer@iup.uni-heidelberg.de</a>&gt;</span><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">VLF,<br>
<br>
Tomorrow i plan to do first tests on 8970 Hz on my fixed antenna in Heidelb=
erg, =A0<a href=3D"http://no.nonsense.ee/qthmap/?qth=3DJN49IK00WG&amp;from=
=3Djn49ik00WD" target=3D"_blank">http://no.nonsense.ee/qthmap/?qth=3DJN49IK=
00WG&amp;from=3Djn49ik00WD</a> It is about 30m up.<br>

<br>
I&#39;ll start doing some resonating tests and may come on air in the after=
noon. 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).<br>

<br>
I expect to be visible on &quot;local&quot; grabbers like DF6NM, OE3GHB and=
 OK2BVG. If all works well i plan to transmit a longer dash, maybe 6000 sec=
onds and later a short message in DFCW-600, like &quot;K&quot; or so, just =
for the proof and to get a first impression about the efficiency of this an=
tenna.<br>

<br>
I had the idea to buy some flexible aluminium tube to form a toroid that wi=
ll be placed on the top of the coil. Tis reduces the maximum E field and ad=
ds some C, that might be needed to come down to 8970 Hz...<br>
<br>
Of course all this depends on the absence of rain but now i don&#39;t need =
wind! Therefore, the signals will be about 20 dB lower, probably.<br>
<br>
The signal will be overload my grabber <a href=3D"http://www.iup.uni-heidel=
berg.de/schaefer_vlf/DK7FC_VLF_Grabber.html" target=3D"_blank">http://www.i=
up.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html</a> that is in abo=
ut 20 m (!) distance. Hopefully it gets not damaged due to several 10 kV on=
 the wire.<br>

<br>
Is there someone who will watch for that signal?<br>
<br>
Reports would be very apprechiated!<br>
<br>
73, CU, Stefan/DK7FC<br>
<br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xbm=
-qrp.blogspot.com/" target=3D"_blank">http://g3xbm-qrp.blogspot.com/</a><br=
><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm.co.u=
k</a><br>
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www.=
youtube.com/user/g3xbm</a><br><a href=3D"https://sites.google.com/site/sub9=
khz/" target=3D"_blank">https://sites.google.com/site/sub9khz/</a><br><br>

--001636e0b17efbaefe04a54f14d7--