To: rsgb_lf_group@blacksheep.org
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From: Markus Vester <markusvester@aol.com>
Message-Id: <8CEDA76E04F70F0-1B04-5AAF@webmail-d082.sysops.aol.com>
Date: Tue, 27 Mar 2012 17:22:42 -0400 (EDT)
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Subject: VLF: DF6NM on 8970.002
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It's a beautiful night! At 20:25, I have started up a straight carrier on 8=
970.002 Hz (DHO locked). If all stays well I will leave it on until after s=
unrise.

An interesting observation on the side: In the first few minutes, I drove t=
he amp up to 400 mA antenna current. A little corona became visible near th=
e ends of two of the three topload wires - it wasn't very bright, not unlik=
e 3rd magnitude stars when viewed from the ground 10 m below. But the 9 kHz=
 sound from antenna itself could be heard quite loudly, which is a potentia=
l cause for neighbourhood trouble.=20

Then I reduced the drive to 350 mA where the corona disappeared completely.=
 So did the noise, the antenna became absolutely quiet! All that was left w=
as a little noise from the coil in the dustbin on the balcony, and the tran=
sformer indoors. Thus the predominant cause for a squeaking antenna must be=
 corona. The fact that it can be heard at 9 rather than 18 kHz demonstrates=
 that the discharge must have an asymmetric dependence on the voltage polar=
ity.

At the same time, wideband electrical noise on the nearby LF grabber antenn=
a went down by 20 dB.=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, intermodulatin=
g with DCF 77, thus appearing on 24 x 8970.002 - 77500 =3D 137780.048 Hz.

Best regards,
Markus (DF6NM)

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>It's a beautiful night! At 20:25, I have started up a straight carrier=
 on 8970.002 Hz (DHO locked). If all stays well I will leave it on until af=
ter sunrise.</div>


<div>&nbsp;</div>


<div>An interesting observation on the side: In the first few minutes, I dr=
ove the amp up to 400 mA antenna current. A little corona became visible ne=
ar the ends of two of the three topload wires - it wasn't very bright, not =
unlike 3rd magnitude stars when viewed from the ground&nbsp;10 m below. But=
 the 9 kHz sound from antenna&nbsp;itself could be heard quite loudly, whic=
h is a&nbsp;potential cause&nbsp;for&nbsp;neighbourhood trouble. </div>


<div>&nbsp;</div>


<div>Then I reduced the drive to 350 mA where the corona disappeared comple=
tely. So did the noise, the antenna&nbsp;became absolutely quiet! All that =
was left was a little&nbsp;noise from the coil in the dustbin on the balcon=
y, and the transformer indoors.&nbsp;Thus the predominant cause for a squea=
king antenna must be&nbsp;corona. The fact that it can be heard at 9 rather=
 than 18 kHz&nbsp;demonstrates that&nbsp;the discharge must&nbsp;have&nbsp;=
an asymmetric dependence on the voltage polarity.</div>


<div>&nbsp;</div>


<div>At the same time, wideband electrical noise on the nearby LF grabber a=
ntenna went down by 20 dB. </div>


<div>&nbsp;</div>


<div>BTW If you like you can actually read my VLF frequency from&nbsp;an&nb=
sp;alias line on the LF TA grabber: It is created by the 24th VLF harmonic,=
 intermodulating with DCF 77,&nbsp;thus appearing on&nbsp;24 x 8970.002 - 7=
7500 =3D 137780.048 Hz.</div>


<div>&nbsp;</div>


<div>Best regards,</div>


<div>Markus (DF6NM)</div>
</font>
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