From: Gerhard Hickl <gerhard.hickl@aon.at>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <4CE6C2CA.3050309@iup.uni-heidelberg.de>
References: <BDEMKFCNLMIILGIFNONNIENODKAA.victor13@online.nl>
	 <4CE6598B.9020303@online.fr>
	 <AANLkTi=zrSORZpF5D_R4sHkHF5T=R4Jd-d4j=S_FQrd4@mail.gmail.com>
	 <4CE6C2CA.3050309@iup.uni-heidelberg.de>
Date: Fri, 19 Nov 2010 23:05:32 +0100
Message-ID: <1290204332.1831.42.camel@gerhard-desktop>
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Subject: Re: VLF: Long time transmission on earth antenna
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Hi Stefan!

At least at my site, QRM/QRN was pretty low this day and so rather the
(too) wet soil could be the reason for your weak signal.

I watched you grabber and when I saw you were "only" 40db oN on your
DFCW6000 window (4-5km), I had no hope to copy your signal here at
594km!

BTW: Do you think it is true that we can assume 18db Loss for twice the
distance?

73
OE3GHB
Gerhard


Am Freitag, den 19.11.2010, 19:32 +0100 schrieb Stefan Sch=C3=A4fer:
> Hi Gary, VLF,
>=20
> OK, nothing received this time, not even by Paul Nicholson. A pity.
> But it was shown that Micheal Oexner clearly received the signal at
> 250W in DFCW-600 (before some weeks) so it must have been about 10 dB
> stronger at 100W and 141 =C2=B5Hz. So there must have been other reasons
> why there was no reception. Maybe the wet soil is still a disadvantage
> or the QRM was just to high.=20
> I will not give up on the earth antenna but maybe it makes more sense
> to try more power and a faster mode in shorter distances first. Maybe
> i will arrange a RX at my parents QTH in 36 km distance...
>=20
> Its time to make an new kite experiment. If the wind will be fine, i
> will do it next weekend. Before i want to arrange a 3rd tap on the
> coil for 300m @ 8970 Hz. And i am highly interested to drive this
> antenna on 137 kHz :-)
>=20
> Thanks to all for taking part at the yesterdays test and building up
> RX and Grabbers! :-)
>=20
> 73, Stefan/DK7FC
>=20
> PS: After the test, the PA, SMPS, netbook, car, antenna and the forest
> is well up! Batteries were discharged to 9 V ;-)=20
>=20
>=20
>=20
> Am 19.11.2010 16:32, schrieb Gary - G4WGT:=20
> > Hello Stefan,=20
> >=20
> >=20
> > Nothing here up to the sound card crashing about midnight.
> >=20
> >=20
> > 73
> >=20
> >=20
> > Gary - G4WGT
> >=20
> >=20
> > On 19 November 2010 11:03, "Jean-Pierre M=C3=A9r=C3=A9 (F1AFJ)"
> > <jpm.f1afj@online.fr> wrote:
> >         Hi Stefan ,
> >        =20
> >         Nothing here ! I listening 20:00 to 07:00 today
> >        =20
> >         73 Jean-Pierre f1afj
> >        =20
> >         Le 19/11/2010 11:50, victor13@online.nl a =C3=A9crit :=20
> >        =20
> >                 Not a trace Stefan,sorry,
> >                =20
> >                 73
> >                 Victor
> >                =20
> >                 -----Oorspronkelijk bericht-----
> >                 Van: owner-rsgb_lf_group@blacksheep.org
> >                 [mailto:owner-rsgb_lf_group@blacksheep.org]Namens
> >                 Stefan Sch=C3=A4fer
> >                 Verzonden: vrijdag 19 november 2010 10:15
> >                 Aan: rsgb_lf_group@blacksheep.org
> >                 CC: Paul; Bernd Grupe
> >                 Onderwerp: Re: VLF: Long time transmission on earth
> >                 antenna
> >                =20
> >                =20
> >                 Dear VLF,
> >                =20
> >                 It seems these batteries are not in best condition.
> >                 The carrier got
> >                 weaker and weaker in the morning and disappeared
> >                 arround 5 UTC.
> >                =20
> >                 The SMPS that drives the PA is designed to generate
> >                 its own 15 V supply
> >                 once it started to run. But if the input voltage
> >                 falls below 10V (or 9)
> >                 it shuts down. Seems that this has happend... The
> >                 batteries have>  300
> >                 Ah in sum so it should have been no problem,
> >                 actually...
> >                =20
> >                 I assume no one except me has detected anything?
> >                =20
> >                 BTW: The starting time was 15:30 UTC so the DFCW
> >                 shift appeared at 23:30 UTC
> >                =20
> >                 73, Stefan/DK7FC
> >                =20
> >                =20
> >                =20
> >                 No virus found in this incoming message.
> >                 Checked by AVG - www.avg.com
> >                 Version: 8.5.449 / Virus Database: 271.1.1/3265 -
> >                 Release Date: 11/18/10
> >                 19:34:00
> >                =20
> >                =20
> >                =20
> >                =20
> >        =20
> >        =20
> >=20
> >=20