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From: Lubos <bvgbob@hotmail.com>
To: _RSGB_LF <rsgb_lf_group@blacksheep.org>
Date: Sun, 15 Dec 2013 20:27:58 +0100
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Subject: RE: LF: A short VLF experiment at DK7FC
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Hello Stefan!Thanks for your positive assessment of my new VLF set on the A=
pollo grabber. As you know=2C I changed my VLF receiver during the holidays=
. This one is the "second generation" of my grabber :-)
GL and 73!
Lubos=2C OK2BVG
***************************************************************************=
******************************************************

Date: Sun=2C 15 Dec 2013 19:47:32 +0100
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacksheep.org=3B paul@abelian.netcom.co.uk
Subject: Re: LF: A short VLF experiment at DK7FC

=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
PS: The signal is on air without interruptions since 18:17 UTC. I will=0A=
run it until about 22 UTC.
=0A=

=0A=
Am 15.12.2013 19:46=2C schrieb Stefan Sch=E4fer:=0A=
=0A=
  =0A=
Hi Bob=2C VLF=2C
=0A=
 =20
=0A=
Am 15.12.2013 18:50=2C schrieb Bob Raide:=0A=
  =0A=
    =0A=
    Stefan=3B
=0A=
I know your busy but are you using your house ant [30 meter vertical]=0A=
for such results on8.9 kHz??  Your already DXing like with the kite=0A=
ant!!!=0A=
  =0A=
Yes=2C it is the 30m INV-L. I am about 20 dB weaker compared to the 300m=0A=
vertical experiments in 2010.
=0A=
 =20
=0A=
Thanks to OK2BVG for the DFCW-600 screenshot! Lubos=2C your grabber is=0A=
certainly the best one=2C together with Paul's!
=0A=
 =20
=0A=
I think i found the major problem which caused the instability of my=0A=
transmit signal. The active VLF antenna was connected to the RX=2C which=0A=
overloaded the input. Somehow the 10 kHz reference signal which is=0A=
injected by a 100pF C into the signal was swamped by the rubbish coming=0A=
from the overloaded RX. Thus i lost the track to my ref signal and the=0A=
sample rate detector didn't work properly. Now since the antenna is=0A=
disconnected (my signal is still visible=2C due to crosstalk) and the ref=
=0A=
signal has a nice S/N. Obviously the transmit signal is stable now. I=0A=
will run it for another few hours=2C again on 8970.00500 Hz. The last=0A=
experiment is a long time ago and i just forget about that problem.
=0A=
 =20
=0A=
The next experiment will be soon and i'm doing a few improvements in=0A=
the next days.
=0A=
 =20
=0A=
73=2C Stefan/DK7FC
=0A=
 =20
=0A=
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'><div>Hello Stefan!</div>Thanks f=
or your positive assessment of my new VLF set on the Apollo grabber. As you=
 know=2C I changed my VLF receiver during the holidays. This one is the "se=
cond generation" of my grabber :-)<div><br></div><div>GL and 73!</div><div>=
<br></div><div>Lubos=2C OK2BVG</div><div><br></div><div>*******************=
***************************************************************************=
***********************************<br><div><br><hr id=3D"stopSpelling">Dat=
e: Sun=2C 15 Dec 2013 19:47:32 +0100<br>From: Stefan.Schaefer@iup.uni-heide=
lberg.de<br>To: rsgb_lf_group@blacksheep.org=3B paul@abelian.netcom.co.uk<b=
r>Subject: Re: LF: A short VLF experiment at DK7FC<br><br>=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
PS: The signal is on air without interruptions since 18:17 UTC. I will=0A=
run it until about 22 UTC.<br>=0A=
<br>=0A=
Am 15.12.2013 19:46=2C schrieb Stefan Sch=E4fer:=0A=
<blockquote cite=3D"mid:52ADF903.2040705@iup.uni-heidelberg.de">=0A=
  =0A=
Hi Bob=2C VLF=2C<br>=0A=
  <br>=0A=
Am 15.12.2013 18:50=2C schrieb Bob Raide:=0A=
  <blockquote cite=3D"mid:BLU180-W1363FF8908AA11EB872496ACD90@phx.gbl">=0A=
    <style><!--=0A=
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=0A=
--></style>=0A=
    <div dir=3D"ltr">Stefan=3B<br>=0A=
I know your busy but are you using your house ant [30 meter vertical]=0A=
for such results on8.9 kHz??&nbsp=3B Your already&nbsp=3BDXing like with th=
e kite=0A=
ant!!!</div>=0A=
  </blockquote>=0A=
Yes=2C it is the 30m INV-L. I am about 20 dB weaker compared to the 300m=0A=
vertical experiments in 2010.<br>=0A=
  <br>=0A=
Thanks to OK2BVG for the DFCW-600 screenshot! Lubos=2C your grabber is=0A=
certainly the best one=2C together with Paul's!<br>=0A=
  <br>=0A=
I think i found the major problem which caused the instability of my=0A=
transmit signal. The active VLF antenna was connected to the RX=2C which=0A=
overloaded the input. Somehow the 10 kHz reference signal which is=0A=
injected by a 100pF C into the signal was swamped by the rubbish coming=0A=
from the overloaded RX. Thus i lost the track to my ref signal and the=0A=
sample rate detector didn't work properly. Now since the antenna is=0A=
disconnected (my signal is still visible=2C due to crosstalk) and the ref=
=0A=
signal has a nice S/N. Obviously the transmit signal is stable now. I=0A=
will run it for another few hours=2C again on 8970.00500 Hz. The last=0A=
experiment is a long time ago and i just forget about that problem.<br>=0A=
  <br>=0A=
The next experiment will be soon and i'm doing a few improvements in=0A=
the next days.<br>=0A=
  <br>=0A=
73=2C Stefan/DK7FC<br>=0A=
  <br>=0A=
</blockquote></div></div> 		 	   		  </div></body>
</html>=

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