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From: "Chris" <c.ashby435@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <60699.92482.qm@web28106.mail.ukl.yahoo.com>
Date: Thu, 4 Mar 2010 16:25:35 -0000
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Subject: Re: LF: 9kHz: soundcard RX
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Not sure what your point is, surely you're just saying the diodes are=
 doing their job?
Chris, G4AYT.
  ----- Original Message -----=20
  From: M0FMT=20
  To: rsgb_lf_group@blacksheep.org=20
  Sent: Thursday, March 04, 2010 7:07 AM
  Subject: Re: LF: 9kHz: soundcard RX


        never blown a sound card up yet in over almost ten years of us=
e. Two back to back diodes on the antenna lead close to the input plug=
. Don't leave it connected during thunderstorms. Most modems are left=
 connected day and night to very very long over head telephone wires=
 for years with out problems. Vastly over hyped problem.

        73 es GL petefmt

        --- On Wed, 3/3/10, Horst St=F6cker <horst.stoecker@web.de> wr=
ote:


          From: Horst St=F6cker <horst.stoecker@web.de>
          Subject: LF: 9kHz: soundcard RX
          To: rsgb_lf_group@blacksheep.org
          Date: Wednesday, 3 March, 2010, 9:32


          >And what about a simple band pass filter to supress the 50H=
z and it's harmonics? Necessary or dispensable?

          You can hear (!) the difference. I just took a 10mH coil fro=
m Reichelt to improve my soundcard-RX before one of the last SAQ activ=
ities.

          Despite of more or less excellent digital filtering of SpecL=
ab it's a good idea. One should not keep the soundcard busy with unwan=
ted signals.

          What I am not sure about is the use of an audio transformer.=
 It might have some influence to the signal. As it just has to keep th=
e soundcard from beeing blown it might be a good idea to take a cheap=
 soundcard instead of the audio transformer - and maybe a second in sp=
are.

          Stefan, what USB-soundcard you bought for 10 EUR ?

          Horst DO1KHS
          ___________________________________________________________
          GRATIS f=FCr alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
          Jetzt freischalten unter http://movieflat.web.de

      =20

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<DIV><FONT size=3D2 face=3DArial>Not sure what your point is, surely=
 you're just=20
saying the diodes are doing their job?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Chris, G4AYT.</FONT></DIV>
<BLOCKQUOTE   style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT:=
 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV     style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:=
 black"><B>From:</B>=20
  <A title=3Dm0fmt@yahoo.co.uk href=3D"mailto:m0fmt@yahoo.co.uk">M0FMT=
</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@=
blacksheep.org     href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_l=
f_group@blacksheep.org</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, March 04, 201=
0 7:07=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: LF: 9kHz: soundc=
ard RX</DIV>
  <DIV><BR></DIV>
  <TABLE border=3D0 cellSpacing=3D0 cellPadding=3D0>
    <TBODY>
    <TR>
      <TD vAlign=3Dtop>never blown a sound card up yet in over almost=
 ten years=20
        of use. Two back to back diodes on the antenna lead close to=
 the input=20
        plug. Don't leave it connected during thunderstorms. Most mode=
ms are=20
        left connected day and night to very very long over head telep=
hone wires=20
        for years with out problems. Vastly over hyped problem.<BR><BR=
>73 es GL=20
        petefmt<BR><BR>--- On <B>Wed, 3/3/10, Horst St=F6cker=20
        <I>&lt;horst.stoecker@web.de&gt;</I></B> wrote:<BR>
        <BLOCKQUOTE           style=3D"BORDER-LEFT: rgb(16,16,255) 2px=
 solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR>From:=20
          Horst St=F6cker &lt;horst.stoecker@web.de&gt;<BR>Subject: LF=
: 9kHz:=20
          soundcard RX<BR>To: rsgb_lf_group@blacksheep.org<BR>Date: We=
dnesday, 3=20
          March, 2010, 9:32<BR><BR>
          <DIV class=3DplainMail>&gt;And what about a simple band pass=
 filter to=20
          supress the 50Hz and it's harmonics? Necessary or=20
          dispensable?<BR><BR>You can hear (!) the difference. I just=
 took a=20
          10mH coil from Reichelt to improve my soundcard-RX before on=
e of the=20
          last SAQ activities.<BR><BR>Despite of more or less excellen=
t digital=20
          filtering of SpecLab it's a good idea. One should not keep=
 the=20
          soundcard busy with unwanted signals.<BR><BR>What I am not=
 sure about=20
          is the use of an audio transformer. It might have some influ=
ence to=20
          the signal. As it just has to keep the soundcard from beeing=
 blown it=20
          might be a good idea to take a cheap soundcard instead of th=
e audio=20
          transformer - and maybe a second in spare.<BR><BR>Stefan, wh=
at=20
          USB-soundcard you bought for 10 EUR ?<BR><BR>Horst=20
          DO1KHS<BR>__________________________________________________=
_________<BR>GRATIS=20
          f=FCr alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!<BR>Jetzt=
 freischalten=20
          unter <A href=3D"http://movieflat.web.de/"             targe=
t=3D_blank>http://movieflat.web.de</A><BR><BR></DIV></BLOCKQUOTE></TD>=
</TR></TBODY></TABLE><BR></BLOCKQUOTE></BODY></HTML>

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