Message-ID: <4C7A56EA.8010901@iup.uni-heidelberg.de>
Date: Sun, 29 Aug 2010 14:47:38 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <AANLkTik6kiM7C7THk+8hNRoC+rDjHMi6yz5G5_Tkd4Jg@mail.gmail.com>	<AANLkTikAxN0spae4d7UAdW+MH0tjRxyrD2KfWgN94pFT@mail.gmail.com>	<BF4A524700075746A6467658DFC7102C63821D3C78@ICTS-S-EXC2-CA.luna.kuleuven.be>	<4C77BCB1.4060608@iup.uni-heidelberg.de>	<0B537E764BCB476F8F0CC7168686E14D@Black>	<335984238.20100828130950@web.de>	<4C7971ED.8030006@iup.uni-heidelberg.de> <AANLkTin=3C_thOgqB-hOSydEC7u86ECu7oMe+NYqg0N4@mail.gmail.com>
In-Reply-To: <AANLkTin=3C_thOgqB-hOSydEC7u86ECu7oMe+NYqg0N4@mail.gmail.com>
Subject: Re: VLF: Re: Transmitting 250W at 8970 Hz on a 600m spaced earth
 antenna
Content-Type: multipart/alternative;
 boundary="------------000209020208000707060007"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--------------000209020208000707060007
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id o7TClbkJ004371

Hi Roger,

As written below, the distance was 49,6 km. The signal was detected by=20
Michael Oexner (no callsign) in JN49BF ,who sent a mail with a=20
screenshot yesterday. The reception was a single dash, that absolutely=20
matches time and frequency (compared to my grabber that is tracked by=20
GQD (22,1 kHz)). As usual, a "message" such as "73" or "cu" or "fb" or=20
something like that is preferable, so we will do further tests. It is no=
=20
problem to do those tests since the antenna can just be connected, even=20
during wind and rain :-)

BTW, if my signal was 35 dB above noise in 5 km at 250 W, i could see my=
=20
signal even with 2,5 W :-)
It seems, the QRN comes down below -90 dB in the morning hours on many=20
days, seems to be nothing special in the "DX" period :-)


Eventually i will try to receive my own signal at the QTH of my parents,=
=20
about 35 km distanced, directly orientated to the antenna.

Any questions else?


73, Stefan/DK7FC

Am 29.08.2010 09:15, schrieb Roger Lapthorn:
> Hi Stefan,
>
> Please summarise Saturday's tests with the earth electrode antenna on=20
> 8.97kHz. The above emails leave me a bit confused about who saw the=20
> signal (?) and at what distance.
>
> I believe you are going to repeat the tests to get a better=20
> confirmation of the result?
>
> 73s
> Roger G3XBM
>
> 2010/8/28 Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de=20
> <mailto:schaefer@iup.uni-heidelberg.de>>
>
>     Hi Michael, Markus, VLF,
>
>     Well, time and frequency absolutely corresponds with my
>     transmission so i would say it is a positive reception. Anyway i
>     think we should do the test again, sending a message or a some
>     charakters to better confirm the reception. Maybe DD7PC is QRV in
>     DFCW-600 (abt 4 mHz) again the next time?
>
>     The distance of the todays experiment is: 49.6 km.
>
>     My antenna bearing is 9/189 deg, the QTH of Michael is in an angle
>     of 54 deg to this antenna. So, not an ideal orientation, if the
>     antenna acts like a loop, but a weak reception anyway. The picture
>     shows the locations of TX and RX. The yellow line is the distance,
>     the white line is the antenna orientation. TX power was 250 W,
>     just like yesterday. Antenna current will be measured in the next
>     experiment...
>
>     Tnx to Michael for the effort to catch that signal (Markus as well).
>
>     73, Stefan/DK7FC
>
>     PS: Markus, tnx for the screenshots of the DFCW-3 message :-)
>
>     Am 28.08.2010 13:09, schrieb Michael Oexner:
>
>         Hi Markus, Stefan and list,
>
>
>
>             Since 10:25, Stefan is on air again with his ground loop.
>             Signals
>             on his own grabber are even better than yesterday, perhaps
>             due to
>             somewhat lower QRN. I am also looking here but don't have
>             much hope,
>             as the TX antenna is N-S oriented and Nuernberg is 180 km
>             due east.
>              Good luck,
>             Markus (DF6NM)
>
>         Have a close look at the enclosed screenshot... what would you
>         say?
>
>         There is a weakish line on 8969.735
>
>
>
>
>
>
> --=20
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> G3XBM   GQRP 1678    ISWL G11088

--------------000209020208000707060007
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html; charset=ISO-8859-1"   http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Roger, <br>
<br>
As written below, the distance was 49,6 km. The signal was detected by
Michael Oexner (no callsign) in JN49BF ,who sent a mail with a
screenshot yesterday. The reception was a single dash, that absolutely
matches time and frequency (compared to my grabber that is tracked by
GQD (22,1 kHz)). As usual, a "message" such as "73" or "cu" or "fb" or
something like that is preferable, so we will do further tests. It is
no problem to do those tests since the antenna can just be connected,
even during wind and rain :-)<br>
<br>
BTW, if my signal was 35 dB above noise in 5 km at 250 W, i could see
my signal even with 2,5 W :-)<br>
It seems, the QRN comes down below -90 dB in the morning hours on many
days, seems to be nothing special in the "DX" period :-)<br>
<br>
<br>
Eventually i will try to receive my own signal at the QTH of my
parents, about 35 km distanced, directly orientated to the antenna.<br>
<br>
Any questions else?<br>
<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 29.08.2010 09:15, schrieb Roger Lapthorn:
<blockquote   cite="mid:AANLkTin=3C_thOgqB-hOSydEC7u86ECu7oMe+NYqg0N4@mail.gmail.com"   type="cite">Hi Stefan,<br>
  <br>
Please summarise Saturday's tests with the earth electrode antenna on
8.97kHz. The above emails leave me a bit confused about who saw the
signal (?) and at what distance.<br>
  <br>
I believe you are going to repeat the tests to get a better
confirmation of the result?<br>
  <br>
73s<br>
Roger G3XBM<br>
  <br>
  <div class="gmail_quote">2010/8/28 Stefan Sch&auml;fer <span dir="ltr">&lt;<a   moz-do-not-send="true" href="mailto:schaefer@iup.uni-heidelberg.de">schaefer@iup.uni-heidelberg.de</a>&gt;</span><br>
  <blockquote class="gmail_quote"   style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi
Michael, Markus, VLF,<br>
    <br>
Well, time and frequency absolutely corresponds with my transmission so
i would say it is a positive reception. Anyway i think we should do the
test again, sending a message or a some charakters to better confirm
the reception. Maybe DD7PC is QRV in DFCW-600 (abt 4 mHz) again the
next time?<br>
    <br>
The distance of the todays experiment is: 49.6 km.<br>
    <br>
My antenna bearing is 9/189 deg, the QTH of Michael is in an angle of
54 deg to this antenna. So, not an ideal orientation, if the antenna
acts like a loop, but a weak reception anyway. The picture shows the
locations of TX and RX. The yellow line is the distance, the white line
is the antenna orientation. TX power was 250 W, just like yesterday.
Antenna current will be measured in the next experiment...<br>
    <br>
Tnx to Michael for the effort to catch that signal (Markus as well).<br>
    <br>
73, Stefan/DK7FC<br>
    <br>
PS: Markus, tnx for the screenshots of the DFCW-3 message :-)<br>
    <br>
Am 28.08.2010 13:09, schrieb Michael Oexner:
    <div>
    <div class="h5"><br>
    <blockquote class="gmail_quote"   style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi Markus, Stefan and list,<br>
      <br>
      <br>
&nbsp; <br>
      <blockquote class="gmail_quote"   style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Since 10:25, Stefan is on air again with his ground loop. Signals<br>
on his own grabber are even better than yesterday, perhaps due to<br>
somewhat lower QRN. I am also looking here but don't have much hope,<br>
as the TX antenna is N-S oriented and Nuernberg is 180 km due east.<br>
&nbsp;Good luck,<br>
Markus (DF6NM)<br>
&nbsp; &nbsp; <br>
      </blockquote>
Have a close look at the enclosed screenshot... what would you say?<br>
      <br>
There is a weakish line on 8969.735<br>
      <br>
      <br>
&nbsp; <br>
    </blockquote>
    </div>
    </div>
  </blockquote>
  </div>
  <br>
  <br clear="all">
  <br>
-- <br>
  <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"   target="_blank">http://g3xbm-qrp.blogspot.com/</a><br>
  <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"   target="_blank">http://www.g3xbm.co.uk</a><br>
  <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"   target="_blank">http://www.youtube.com/user/g3xbm</a><br>
G3XBM&nbsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL G11088<br>
</blockquote>
</body>
</html>

--------------000209020208000707060007--