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From: "Dave G3WCB." <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Wed, 28 Mar 2012 17:19:52 +0100
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Subject: LF: RE: DF6NM on 8970.002
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Hi, Markus, LF,

Bentley accoustics produced the "Ionofane"loudspeaker, that used a corona or
plasma discharge as a sound source.

Perhaps you should consider modulating your carrier with some music, for the
amusement of the neighbours? ;-)

http://www.radiomuseum.org/r/faneacoust_ionofane_601.html

73, dave G3WCB IO91RM
  -----Original Message-----
  From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Markus Vester
  Sent: 27 March 2012 22:23
  To: rsgb_lf_group@blacksheep.org
  Subject: VLF: DF6NM on 8970.002


  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 after
sunrise.

  An interesting observation on the side: In the first few minutes, 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, not
unlike 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
potential cause for neighbourhood trouble.

  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 was a little noise from the coil in the dustbin on the balcony, and
the transformer 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 polarity.

  At the same time, wideband electrical noise on the nearby LF grabber
antenna went down by 20 dB.

  BTW If you like you can actually read my VLF frequency from an alias line
on the LF TA grabber: It is created by the 24th VLF harmonic,
intermodulating with DCF 77, thus appearing on 24 x 8970.002 - 77500 =
137780.048 Hz.

  Best regards,
  Markus (DF6NM)

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<BODY>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D296341016-28032012>Hi,=20
Markus, LF,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D296341016-28032012></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D296341016-28032012>Bentley accoustics produced the =
"Ionofane"loudspeaker,=20
that used a corona or plasma discharge as a sound =
source.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D296341016-28032012></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D296341016-28032012>Perhaps you should consider modulating your =
carrier=20
with some music, for the&nbsp;amusement of the neighbours?=20
;-)</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><A=20
href=3D"http://www.radiomuseum.org/r/faneacoust_ionofane_601.html">http:/=
/www.radiomuseum.org/r/faneacoust_ionofane_601.html</A></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D296341016-28032012><FONT face=3DArial color=3D#0000ff =
size=3D2>73,=20
dave G3WCB IO91RM</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Original Message-----<BR><B>From:</B>=20
  owner-rsgb_lf_group@blacksheep.org=20
  [mailto:owner-rsgb_lf_group@blacksheep.org]<B>On Behalf Of </B>Markus=20
  Vester<BR><B>Sent:</B> 27 March 2012 22:23<BR><B>To:</B>=20
  rsgb_lf_group@blacksheep.org<BR><B>Subject:</B> VLF: DF6NM on=20
  8970.002<BR><BR></FONT></DIV><FONT face=3Darial color=3Dblack =
size=3D2>
  <DIV>It's a beautiful night! At 20:25, I have started up a straight =
carrier on=20
  8970.002 Hz (DHO locked). If all stays well I will leave it on until =
after=20
  sunrise.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>An interesting observation on the side: In the first few minutes, =
I drove=20
  the amp up to 400 mA antenna current. A little corona became visible =
near the=20
  ends of two of the three topload wires - it wasn't very bright, not =
unlike 3rd=20
  magnitude stars when viewed from the ground&nbsp;10 m below. But the 9 =
kHz=20
  sound from antenna&nbsp;itself could be heard quite loudly, which is=20
  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=20
  completely. So did the noise, the antenna&nbsp;became absolutely =
quiet! All=20
  that was left was a little&nbsp;noise from the coil in the dustbin on =
the=20
  balcony, and the transformer indoors.&nbsp;Thus the predominant cause =
for a=20
  squeaking antenna must be&nbsp;corona. The fact that it can be heard =
at 9=20
  rather than 18 kHz&nbsp;demonstrates that&nbsp;the discharge=20
  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=20
  antenna went down by 20 dB. </DIV>
  <DIV>&nbsp;</DIV>
  <DIV>BTW If you like you can actually read my VLF frequency=20
  from&nbsp;an&nbsp;alias line on the LF TA grabber: It is created by =
the 24th=20
  VLF harmonic, intermodulating with DCF 77,&nbsp;thus appearing =
on&nbsp;24 x=20
  8970.002 - 77500 =3D 137780.048 Hz.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Best regards,</DIV>
  <DIV>Markus (DF6NM)</DIV></BLOCKQUOTE></FONT></BODY></HTML>

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