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Message-ID: <7714.1643.qm@web28103.mail.ukl.yahoo.com>
References: <4DA89BBA.1010106@iup.uni-heidelberg.de>
Date: Fri, 15 Apr 2011 20:57:51 +0100 (BST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <4DA89BBA.1010106@iup.uni-heidelberg.de>
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Subject: Re: LF: VLF grabber at DK7FC
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Congratulations Stefan

You are without doubt an inspiration to us all in the MF/LF/VLF field.=20

Many thanks for your efforts.
=A073 es GL Pete M0FMT IO91UX=20




________________________________
From: Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 15 April, 2011 20:25:46
Subject: LF: VLF grabber at DK7FC

Dear group,

Today, my VLF grabber at=20
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html becom=
es 1=20
year old :-)

I've never thought that it will be so sensible and will see so many statio=
ns,=20
even with usual LF home antennas and moderate power. The circuit of the ac=
tive=20
antenna was modified several times. Also Spectrum Lab by DL4YHF plays a do=
minant=20
role here. By improving the noise reduction settings, we won another 2 dB=
=20
(about).

First it was a idea of Paul Nicholson to choose a compromise of a long (en=
ough)=20
"carrier" and sending informations. So i came to the good old "DFCW-600".=
 Since=20
my signal was strong out of 40km distance i wanted to add a DFCW-60 and DF=
CW-3=20
window, to monitor my own signal in faster modes. For test purposes i arra=
nged a=20
DFCW-6000 window. The idea was that someone who prepares to be visible in=
 600=20
could see his signal in 6000 and then knowns how many dBs are still missed=
.=20
OE5ODL for example showed often that he is visible in 6000 but just someti=
mes,=20
with the balloon, in 600.
Now we arrived at even 60000 (=3D 47 uHz). Stations like DJ8WX became regu=
larly=20
visible. But there seems to be a limit, given by the VFO accuracy, time an=
d=20
phase instabilities at higher distances.
The Alpha stations are a perfect reference and since having a stable RX is=
=20
essential and there were often questions about the availability of RSDN-20=
, i=20
added the Alpha window, not only to check if my GPS module is still locked=
.
The wideband window gives a good overview of the current QRN situation, so=
lar=20
activities and the presence or absence of military MSK stations or fauls=
 of the=20
rig, that shows in a sudden loss of sensitivity.

Thank you for the interest of 7314 visitors out of 60 countries (34 of 51=
 US=20
states) and 198665 pageviews so far :-) I'll keep the service running as=
 long as=20
possible, and this may be a looong time!
Stations who appeared there so far were: DF6NM, OE5ODL, OE3GHB, DJ8WX, OK2=
BVG,=20
DK7FC and a small sign of PA3CPM
I hope to see more stations soon!


73, Stefan/DK7FC

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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size=
:10pt"><DIV></DIV>
<DIV>Congratulations Stefan</DIV>
<DIV>&nbsp;</DIV>
<DIV>You are without doubt an inspiration to us all in the MF/LF/VLF field=
. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Many thanks for your efforts.<BR>&nbsp;</DIV>73 es GL Pete M0FMT IO91=
UX=20
<DIV><BR></DIV>
<DIV style=3D"FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 10pt">=
<BR>
<DIV style=3D"FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 13px">=
<FONT size=3D2 face=3DTahoma>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Stefan Sch=E4fer &lt=
;Stefan.Schaefer@iup.uni-heidelberg.de&gt;<BR><B><SPAN style=3D"FONT-WEIGH=
T: bold">To:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"=
FONT-WEIGHT: bold">Sent:</SPAN></B> Fri, 15 April, 2011 20:25:46<BR><B><SP=
AN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> LF: VLF grabber at DK7F=
C<BR></FONT><BR>Dear group,<BR><BR>Today, my VLF grabber at <A href=3D"htt=
p://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html" target=
=3D_blank>http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.=
html</A> becomes 1 year old :-)<BR><BR>I've never thought that it will be=
 so sensible and will see so many stations, even with usual LF home antenn=
as and moderate power. The circuit of the active antenna was modified seve=
ral times. Also Spectrum Lab by DL4YHF plays a dominant role here. By impr=
oving the noise reduction settings, we won another 2 dB (about).<BR><BR>Fi=
rst it was a idea of
 Paul Nicholson to choose a compromise of a long (enough) "carrier" and se=
nding informations. So i came to the good old "DFCW-600". Since my signal=
 was strong out of 40km distance i wanted to add a DFCW-60 and DFCW-3 wind=
ow, to monitor my own signal in faster modes. For test purposes i arranged=
 a DFCW-6000 window. The idea was that someone who prepares to be visible=
 in 600 could see his signal in 6000 and then knowns how many dBs are stil=
l missed. OE5ODL for example showed often that he is visible in 6000 but=
 just sometimes, with the balloon, in 600.<BR>Now we arrived at even 60000=
 (=3D 47 uHz). Stations like DJ8WX became regularly visible. But there see=
ms to be a limit, given by the VFO accuracy, time and phase instabilities=
 at higher distances.<BR>The Alpha stations are a perfect reference and si=
nce having a stable RX is essential and there were often questions about=
 the availability of RSDN-20, i added the Alpha window, not only to check=
 if my GPS
 module is still locked.<BR>The wideband window gives a good overview of=
 the current QRN situation, solar activities and the presence or absence=
 of military MSK stations or fauls of the rig, that shows in a sudden loss=
 of sensitivity.<BR><BR>Thank you for the interest of 7314 visitors out of=
 60 countries (34 of 51 US states) and 198665 pageviews so far :-) I'll ke=
ep the service running as long as possible, and this may be a looong time!=
<BR>Stations who appeared there so far were: DF6NM, OE5ODL, OE3GHB, DJ8WX,=
 OK2BVG, DK7FC and a small sign of PA3CPM<BR>I hope to see more stations=
 soon!<BR><BR><BR>73, Stefan/DK7FC<BR><BR></DIV></DIV></div></body></html>

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