References: <4CD861D8.3070904@iup.uni-heidelberg.de> <4CD920EB.4070707@mvnet.de> <4CE28C13.3080200@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Date: Tue, 16 Nov 2010 12:53:31 -0500
In-Reply-To: <4CE28C13.3080200@iup.uni-heidelberg.de>
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From: Markus Vester <markusvester@aol.com>
Cc: web0807@abelian.org
Message-Id: <8CD53CE511474E6-848-EAE@webmail-d027.sysops.aol.com>
Subject: Re: VLF: Long time transmission on earth antenna
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Hi Stefan,=20

since 16:54, you are painting a strong 8970 Hz trace on your own VLF grabb=
er, about -69dB (35dB SNR) in the 4.5 mHz window. Interestingly, there is=
 also a 15th harmonic at 134.55 kHz, which appears on your wideband LF gra=
bber at - 80dB (20 dB SNR).=20

Nothing seen on the 0.95 mHz VLF grabber in Nuernberg yet, which may of co=
urse be due to me being near the null of your N-S oriented earth antenna.

Good luck,
Markus


-----Urspr=C3=BCngliche Mitteilung-----=20
Von: Stefan Sch=C3=A4fer <schaefer@iup.uni-heidelberg.de>
An: rsgb_lf_group@blacksheep.org
Cc: Paul <paul@abelian.netcom.co.uk>
Verschickt: Di., 16. Nov. 2010, 14:50
Thema: Re: VLF: Long time transmission on earth antenna


Dear VLF,

I will do some pre-tests today on the earth antenna (testing if GPS can be=
 received in the forest and if the output transformer becomes warm in stea=
dy state when running 100 W RF key-down).=20

Before i will do a (new) short test on 1970 Hz. A loop antenna was built=
 to receive on 1970 Hz. It has still no preamp but is directly fed into th=
e soundcard, anyway... The antenna is now nulling out the strong QRM of th=
e tram line near the institute and i hope for a better S/N.

After that about one hour or so on 8970.00500 Hz.

Starting time is in about 90 minutes.

If someone wants spontaneous to take part, you are invited. The 24 h trans=
mission will then come hopefully in a few days, maybe wednesday/thursday..=
.


73, Stefan/DK7FC

PS: Again note that this is a very weak signal test and cannot be compared=
 with a kite antenna transmission. So do not wonder if the signal doesn't=
 appear at 25 dB S/N in 4.5 mHz ;-)

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Hi Stefan, </div>


<div>&nbsp;</div>


<div>since 16:54, you&nbsp;are painting&nbsp;a&nbsp;strong&nbsp;8970 Hz tr=
ace&nbsp;on your own VLF grabber, about -69dB (35dB SNR) in the 4.5 mHz wi=
ndow. Interestingly, there is also a 15th harmonic&nbsp;at 134.55 kHz, whi=
ch appears on your&nbsp;wideband LF grabber at - 80dB (20 dB SNR). </div>


<div>&nbsp;</div>


<div>Nothing seen on the 0.95 mHz VLF grabber in Nuernberg yet, which may=
 of course be due&nbsp;to me being&nbsp;near the null of&nbsp;your N-S ori=
ented earth antenna.</div>


<div>&nbsp;</div>


<div>Good luck,</div>


<div>Markus<br>
<br>
</div>


<div style=3D"FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: arial,helvetica"=
>-----Urspr=C3=BCngliche Mitteilung----- <br>
Von: Stefan Sch=C3=A4fer &lt;schaefer@iup.uni-heidelberg.de&gt;<br>
An: rsgb_lf_group@blacksheep.org<br>
Cc: Paul &lt;paul@abelian.netcom.co.uk&gt;<br>
Verschickt: Di., 16. Nov. 2010, 14:50<br>
Thema: Re: VLF: Long time transmission on earth antenna<br>
<br>


<div id=3DAOLMsgPart_2_c547521e-e7c4-47c4-8918-1f86f4f9dbe3>Dear VLF,<br>
<br>
I will do some <U>pre-tests</U> today on the earth antenna (testing if GPS=
 can be received in the forest and if the output transformer becomes warm=
 in steady state when running 100 W RF key-down). <br>
<br>
Before i will do a (new) short test on 1970 Hz. A loop antenna was built=
 to receive on 1970 Hz. It has still no preamp but is directly fed into th=
e soundcard, anyway... The antenna is now nulling out the strong QRM of th=
e tram line near the institute and i hope for a better S/N.<br>
<br>
After that about one hour or so on 8970.00500 Hz.<br>
<br>
Starting time is in about 90 minutes.<br>
<br>
If someone wants spontaneous to take part, you are invited. The 24 h trans=
mission will then come hopefully in a few days, maybe wednesday/thursday..=
.<br>
<br>
<br>
73, Stefan/DK7FC<br>
<br>
PS: Again note that this is a very weak signal test and cannot be compared=
 with a kite antenna transmission. So do not wonder if the signal doesn't=
 appear at 25 dB S/N in 4.5 mHz ;-)<br>
</div>
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