Message-ID: <4DCBB337.5070002@iup.uni-heidelberg.de>
Date: Thu, 12 May 2011 12:15:19 +0200
From: =?ISO-8859-2?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <4DCAA066.8090701@iup.uni-heidelberg.de> <BAY154-w24B7B0CB9F3BFF62E4DB94D3890@phx.gbl>
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Subject: Re: LF: Lf Frontend
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Hello Lubos,

Yes it works but obviously the plastic housing is to small and so a=20
capacitor was moving the resonance down. HGA22 was so strong it peaked=20
the 0 dB mark of my soundcard and caused strongest IM in the night.=20
Furthermore it is raining now and the raindrops seem to move the=20
resonance down even more. Seems i have to put the circuit back into a=20
metallic housing where it worked well in the last days...

73, Stefan/DK7FC

Am 12.05.2011 05:51, schrieb Lubos OK2BVG:
> Hello Stefan!
> It is interesting, thanks for information and nice picture.
>
> Lubos, OK2BVG
>
> BTW: It seems, my grabber works.Vesel=FD obli=E8ej
>
> *******************************************
>
>
> > Date: Wed, 11 May 2011 16:42:46 +0200
> > From: Stefan.Schaefer@iup.uni-heidelberg.de
> > To: rsgb_lf_group@blacksheep.org
> > Subject: LF: Lf Frontend
> >
> > Hello group,
> >
> > Here a picture of my new LF frontend of my active antenna,
> > http://dl.dropbox.com/u/19882028/LF/LF%20frontend.jpg
> > It has a 2 stage bandpass filter in front of the first FET stage (BF86=
2
> > which is located on the back side). The Q is not very high but DLF and
> > DCF49 are attenuated by about 15 dB. Additionally it provides a kind=
 of
> > HV protection, i hope ;-) But the main purpose is to filter VLF and MF
> > and HF. On the older version i regularly saw MSK traces arround 136.6
> > kHz. This is 153 kHz (DLF) minus 16.4 kHz (JXN)! :-)
> > After some test time it moves in a water proof PVC tube now and is
> > intended to run 24/7 on the grabber as the omnidirectional antenna.
> > Further improvements will be done in the shack, perhaps.
> >
> > 73, Stefan/DK7FC
> >

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content=3D"text/html; charset=3DISO-8859-2"   http-equiv=3D"Conten=
t-Type">
</head>
<body bgcolor=3D"#ffffff" text=3D"#000000">
Hello Lubos, <br>
<br>
Yes it works but obviously the plastic housing is to small and so a
capacitor was moving the resonance down. HGA22 was so strong it peaked
the 0 dB mark of my soundcard and caused strongest IM in the night.
Furthermore it is raining now and the raindrops seem to move the
resonance down even more. Seems i have to put the circuit back into a
metallic housing where it worked well in the last days...<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 12.05.2011 05:51, schrieb Lubos OK2BVG:
<blockquote cite=3D"mid:BAY154-w24B7B0CB9F3BFF62E4DB94D3890@phx.gbl"   typ=
e=3D"cite">
  <style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style>Hello
Stefan!
  <div>It is interesting, thanks for information and nice picture.</div>
  <div><br>
  </div>
  <div>Lubos, OK2BVG</div>
  <div><br>
  </div>
  <div>BTW: It seems, my grabber works.<img moz-do-not-send=3D"true"   src=
=3D"http://gfx1.hotmail.com/mail/w4/pr04/ltr/emo/smile.gif"   title=3D"Ves=
el=FD obli=E8ej" alt=3D"Vesel=FD obli=E8ej"   style=3D"border-style: none;=
 vertical-align: text-bottom;" width=3D"19"   height=3D"19"></div>
  <div><br>
  </div>
  <div>******************************************* =A0</div>
  <div><br>
  <br>
&gt; Date: Wed, 11 May 2011 16:42:46 +0200<br>
&gt; From: <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:Stefan.Sch=
aefer@iup.uni-heidelberg.de">Stefan.Schaefer@iup.uni-heidelberg.de</a><br>
&gt; To: <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:rsgb_lf_grou=
p@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
&gt; Subject: LF: Lf Frontend<br>
&gt; <br>
&gt; Hello group,<br>
&gt; <br>
&gt; Here a picture of my new LF frontend of my active antenna, <br>
&gt; <a class=3D"moz-txt-link-freetext" href=3D"http://dl.dropbox.com/u/19=
882028/LF/LF%20frontend.jpg">http://dl.dropbox.com/u/19882028/LF/LF%20fron=
tend.jpg</a><br>
&gt; It has a 2 stage bandpass filter in front of the first FET stage
(BF862 <br>
&gt; which is located on the back side). The Q is not very high but DLF
and <br>
&gt; DCF49 are attenuated by about 15 dB. Additionally it provides a
kind of <br>
&gt; HV protection, i hope ;-) But the main purpose is to filter VLF
and MF <br>
&gt; and HF. On the older version i regularly saw MSK traces arround
136.6 <br>
&gt; kHz. This is 153 kHz (DLF) minus 16.4 kHz (JXN)! :-)<br>
&gt; After some test time it moves in a water proof PVC tube now and is
  <br>
&gt; intended to run 24/7 on the grabber as the omnidirectional
antenna. <br>
&gt; Further improvements will be done in the shack, perhaps.<br>
&gt; <br>
&gt; 73, Stefan/DK7FC<br>
&gt; <br>
  </div>
</blockquote>
</body>
</html>

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