From: <victor13@online.nl>
To: <rsgb_lf_group@blacksheep.org>
Date: Tue, 29 Jun 2010 16:22:59 +0200
Message-ID: <BDEMKFCNLMIILGIFNONNCEBIDJAA.victor13@online.nl>
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Subject: LF: RE: Extreme Dreaming: Announcement for the 47 km band :-)
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RE: VLF: Strong drifting carrier on VLF!Hello Stefan,

rx works down to 200 HZ,so count me in,

73 Victor
PA3FNY
  -----Oorspronkelijk bericht-----
  Van: Stefan Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org]Nam=
ens
Stefan Sch=E4fer
  Verzonden: dinsdag 29 juni 2010 1:13
  Aan: rsgb_lf_group@blacksheep.org
  CC: bernd.grupe@t-online.de
  Onderwerp: VLF: Extreme Dreaming: Announcement for the 47 km band :-=
)


  Dear VLF,

  Today i have got the official permission of the german authorities=
 for a
kite vertical antenna up to 300 m above ground! :-))

  This permission is time limited to the 30th June 2012, which is a pr=
etty
long time :-))))) Also, is limited to the location where i was QRV in=
 the
last experiments (JN49IS).

  On each test (that MUST be during the daylight!) i have to inform th=
e
german air-traffic control. This can be done by a telephone call, so=
 no
problem.

  The owner of the kite store told me that there are 200m long braids=
 for
such kites available. So, when using a 300 m vertical antenna i will=
 add
this braid to the 100 m braid that i am using all the time.

  When transmitting with that antenna on 8,97 kHz i have to reduce the=
 L
since my C is abt 3 times higher. But to get experience with such huge
constructions i will start just using a 200m vertical without changing=
 the
L. This is a first step. My 600 W PA will have no problem with QSY sin=
ce it
is a H bridge without an output transformer. It can itdown do DC ;-)=
=20

  Having twice the C without changing the L (later i will reduce it to=
 come
back to 8,97) will result in a resonance frequency of 8,97/sqrt(2) is=
 about
6,34 kHz, the 47,3 km band. When applying 500W i suppose to radiate an=
 ERP
of 16 mW!! In my 2nd test that was received by Paul Nicholson it was=
 1,7 mW,
so about 10 dB more in the next test. The exact frequency has to be fo=
und in
some measurements and is caused by the real resonance of the system.=
 So 6,34
kHz is just a number. But since i have the 30 mH variometer i am sure=
 to
make it adjustable within a range of some Hz.

  Let's see what can be achieved with such an antenna on that frequenc=
y.

  There were at least 10 RX stations who demonstated to have most suit=
able
VLF RX possibilities in the last tests!Who of those (and others) are
interested to try an attempt to receive such a signal in good old DFCW=
-600 ?

  This will be an exciting summer/autumn/winter, isn't it? Also on 137=
 kHz
;-)... *amhappy*=20



  73, Stefan/DK7FC

  PS: If using 300m i will come down to 5,18 kHz, the 58 km band ;-)=
 ...and
having 32 mW ERP

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML dir=3Dltr><HEAD><TITLE>RE: VLF: Strong drifting carrier on VLF!<=
/TITLE>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Diso-88=
59-1">
<META content=3D"MSHTML 6.00.6000.16788" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff size=3D2>Hello=20
Stefan,</FONT></SPAN></DIV>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff size=3D2>rx=20
works down to 200 HZ,so count me in,</FONT></SPAN></DIV>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff size=3D2>73=20
Victor</FONT></SPAN></DIV>
<DIV><SPAN class=3D524082214-29062010><FONT face=3DArial color=3D#0000=
ff   size=3D2>PA3FNY</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT face=
=3DTahoma     size=3D2>-----Oorspronkelijk bericht-----<BR><B>Van:</B>=
 Stefan Sch=E4fer=20
  [mailto:owner-rsgb_lf_group@blacksheep.org]<B>Namens </B>Stefan=20
  Sch=E4fer<BR><B>Verzonden:</B> dinsdag 29 juni 2010 1:13<BR><B>Aan:<=
/B>=20
  rsgb_lf_group@blacksheep.org<BR><B>CC:</B>=20
  bernd.grupe@t-online.de<BR><B>Onderwerp:</B> VLF: Extreme Dreaming:=
=20
  Announcement for the 47 km band :-)<BR><BR></FONT></DIV>
  <P>Dear VLF,</P>
  <P>Today i have got the official permission of the german authoritie=
s for a=20
  <STRONG>kite vertical antenna up to 300 m</STRONG> above ground! :-)=
)</P>
  <P>This permission is time <STRONG>limited to the 30th June 2012</ST=
RONG>,=20
  which is a pretty long time :-))))) Also, is limited to the location=
 where i=20
  was QRV in the last experiments (JN49IS).</P>
  <P>On each test (that MUST be during the daylight!) i have to inform=
 the=20
  german air-traffic control. This can be done by a telephone call, so=
 no=20
  problem.</P>
  <P>The owner of the kite store told me that there are 200m long brai=
ds for=20
  such kites available. So, when using a 300 m vertical antenna i will=
 add this=20
  braid to the 100 m braid that i am using all the time.</P>
  <P>When transmitting with that antenna on 8,97 kHz i have to reduce=
 the L=20
  since my C is abt 3 times higher. But to get experience with such hu=
ge=20
  constructions i will start just using a 200m vertical without changi=
ng the L.=20
  This is a first step. My 600 W PA will have no problem with QSY sinc=
e it is a=20
  H bridge without an output transformer. It can itdown do DC ;-) </P>
  <P>Having twice the C without changing the L (later i will reduce it=
 to come=20
  back to 8,97) will result in a resonance frequency of 8,97/sqrt(2)=
 is about=20
  <STRONG>6,34 kHz, the 47,3 km band</STRONG>. When applying 500W i su=
ppose=20
  to<STRONG> radiate an ERP of 16 mW</STRONG>!! In my 2nd test that wa=
s received=20
  by Paul Nicholson it was 1,7 mW, so about 10 dB more in the next tes=
t. The=20
  exact frequency has to be found in some measurements and is caused=
 by the real=20
  resonance of the system. So 6,34 kHz is just a number. But since i=
 have the 30=20
  mH variometer i am sure to make it adjustable within a range of some=
 Hz.</P>
  <P>Let's see what can be achieved with such an antenna on that frequ=
ency.</P>
  <P>There were at least 10 RX stations who demonstated to have&nbsp;m=
ost=20
  suitable VLF RX possibilities in the last tests!<STRONG>Who of those=
 (and=20
  others) are interested to try an attempt to receive such a signal in=
 good old=20
  DFCW-600 ?</STRONG></P>
  <P>This will be an exciting summer/autumn/winter, isn't it? Also on=
 137 kHz=20
  ;-)... *amhappy* </P>
  <P>&nbsp;</P>
  <P>73, Stefan/DK7FC</P>
  <P>PS: If using 300m i will come down to 5,18 kHz, the 58 km band ;-=
) ...and=20
  having 32 mW ERP</P></BLOCKQUOTE></BODY></HTML>

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