Message-ID: <BAY154-W35708C3366D9350C358FECD34B0@phx.gbl>
From: Lubos OK2BVG <bvgbob@hotmail.com>
To: _RSGB_LF <rsgb_lf_group@blacksheep.org>
Date: Wed, 28 Mar 2012 06:22:48 +0200
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Subject: RE: VLF: DF6NM on 8970.002
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Hello Markus=2C VLF!Your signal is nice visible on my grabber in QRSS6000 a=
nd traces in QRSS600. In the 6000 window is evident=2C that we did our VLF =
QSO in time=2C when the noise conditions were not the best. I have written =
an article about our qso in Czech. It will be publised in a ham magazine "R=
adioamater"=2C common known in The Czech and Slovak republic. Some hams wou=
ld be encouraged to find VLF band by the report. :-)
73!
Lubos=2C OK2BVG

To: rsgb_lf_group@blacksheep.org
From: markusvester@aol.com
Date: Tue=2C 27 Mar 2012 17:22:42 -0400
Subject: VLF: DF6NM on 8970.002


It's a beautiful night! At 20:25=2C I have started up a straight carrier on=
 8970.002 Hz (DHO locked). If all stays well I will leave it on until after=
 sunrise.


=20


An interesting observation on the side: In the first few minutes=2C I drove=
 the amp up to 400 mA antenna current. A little corona became visible near =
the ends of two of the three topload wires - it wasn't very bright=2C not u=
nlike 3rd magnitude stars when viewed from the ground 10 m below. But the 9=
 kHz sound from antenna itself could be heard quite loudly=2C which is a po=
tential cause for neighbourhood trouble.=20


=20


Then I reduced the drive to 350 mA where the corona disappeared completely.=
 So did the noise=2C the antenna became absolutely quiet! All that was left=
 was a little noise from the coil in the dustbin on the balcony=2C and the =
transformer indoors. Thus the predominant cause for a squeaking antenna mus=
t be corona. The fact that it can be heard at 9 rather than 18 kHz demonstr=
ates that the discharge must have an asymmetric dependence on the voltage p=
olarity.


=20


At the same time=2C wideband electrical noise on the nearby LF grabber ante=
nna went down by 20 dB.=20


=20


BTW If you like you can actually read my VLF frequency from an alias line o=
n the LF TA grabber: It is created by the 24th VLF harmonic=2C intermodulat=
ing with DCF 77=2C thus appearing on 24 x 8970.002 - 77500 =3D 137780.048 H=
z.


=20


Best regards=2C


Markus (DF6NM)
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>
Hello Markus=2C VLF!<div>Your signal is nice visible on my grabber in QRSS6=
000 and traces in QRSS600. In the 6000 window is evident=2C that we did our=
 VLF QSO in time=2C when the noise conditions were not the best.&nbsp=3B</d=
iv><div>I have written an article about our qso in Czech. It will be publis=
ed in a ham magazine "Radioamater"=2C common known in The Czech and Slovak =
republic. Some hams would be encouraged to find VLF band by the report. :-)=
</div><div><br></div><div>73!</div><div><br></div><div>Lubos=2C OK2BVG<br><=
br><div><div id=3D"SkyDrivePlaceholder"></div><hr id=3D"stopSpelling">To: r=
sgb_lf_group@blacksheep.org<br>From: markusvester@aol.com<br>Date: Tue=2C 2=
7 Mar 2012 17:22:42 -0400<br>Subject: VLF: DF6NM on 8970.002<br><br><font c=
olor=3D"black" size=3D"2" face=3D"arial">
<div>It's a beautiful night! At 20:25=2C I have started up a straight carri=
er on 8970.002 Hz (DHO locked). If all stays well I will leave it on until =
after sunrise.</div>


<div>&nbsp=3B</div>


<div>An interesting observation on the side: In the first few minutes=2C I =
drove the amp up to 400 mA antenna current. A little corona became visible =
near the ends of two of the three topload wires - it wasn't very bright=2C =
not unlike 3rd magnitude stars when viewed from the ground&nbsp=3B10 m belo=
w. But the 9 kHz sound from antenna&nbsp=3Bitself could be heard quite loud=
ly=2C which is a&nbsp=3Bpotential cause&nbsp=3Bfor&nbsp=3Bneighbourhood tro=
uble. </div>


<div>&nbsp=3B</div>


<div>Then I reduced the drive to 350 mA where the corona disappeared comple=
tely. So did the noise=2C the antenna&nbsp=3Bbecame absolutely quiet! All t=
hat was left was a little&nbsp=3Bnoise from the coil in the dustbin on the =
balcony=2C and the transformer indoors.&nbsp=3BThus the predominant cause f=
or a squeaking antenna must be&nbsp=3Bcorona. The fact that it can be heard=
 at 9 rather than 18 kHz&nbsp=3Bdemonstrates that&nbsp=3Bthe discharge must=
&nbsp=3Bhave&nbsp=3Ban asymmetric dependence on the voltage polarity.</div>


<div>&nbsp=3B</div>


<div>At the same time=2C wideband electrical noise on the nearby LF grabber=
 antenna went down by 20 dB. </div>


<div>&nbsp=3B</div>


<div>BTW If you like you can actually read my VLF frequency from&nbsp=3Ban&=
nbsp=3Balias line on the LF TA grabber: It is created by the 24th VLF harmo=
nic=2C intermodulating with DCF 77=2C&nbsp=3Bthus appearing on&nbsp=3B24 x =
8970.002 - 77500 =3D 137780.048 Hz.</div>


<div>&nbsp=3B</div>


<div>Best regards=2C</div>


<div>Markus (DF6NM)</div>
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