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Date: Wed, 3 Mar 2010 23:07:38 -0800 (PST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 9kHz: soundcard RX
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never blown a sound card up yet in over almost ten years of use. 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 prob=
lems. Vastly over hyped problem.

73 es GL petefmt

--- On Wed, 3/3/10, Horst St=F6cker <horst.stoecker@web.de> wrote:


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 50Hz and it's har=
monics? Necessary or dispensable?

You can hear (!) the difference. I just took a 10mH coil from Reichelt to=
 improve my soundcard-RX before one of the last SAQ activities.

Despite of more or less excellent digital filtering of SpecLab it's a good=
 idea. One should not keep the soundcard busy with unwanted 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 the 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 spare.

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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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D=
"top" style=3D"font: inherit;">never blown a sound card up yet in over alm=
ost ten years of use. Two back to back diodes on the antenna lead close to=
 the input plug. Don't leave it connected during thunderstorms. Most modem=
s are left connected day and night to very very long over head telephone=
 wires for years with out problems. Vastly over hyped problem.<BR><BR>73=
 es GL petefmt<BR><BR>--- On <B>Wed, 3/3/10, Horst St=F6cker <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: Horst St=F6cker &lt;horst.stoecker@web.d=
e&gt;<BR>Subject: LF: 9kHz: soundcard RX<BR>To: rsgb_lf_group@blacksheep.o=
rg<BR>Date: Wednesday, 3 March, 2010, 9:32<BR><BR>
<DIV class=3DplainMail>&gt;And what about a simple band pass filter to sup=
ress the 50Hz and it's harmonics? Necessary or dispensable?<BR><BR>You can=
 hear (!) the difference. I just took a 10mH coil from Reichelt to improve=
 my soundcard-RX before one of the last SAQ activities.<BR><BR>Despite of=
 more or less excellent digital filtering of SpecLab it's a good idea. One=
 should not keep the soundcard busy with unwanted signals.<BR><BR>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 the soundcard from beeing=
 blown it might be a good idea to take a cheap soundcard instead of the au=
dio transformer - and maybe a second in spare.<BR><BR>Stefan, what USB-sou=
ndcard you bought for 10 EUR ?<BR><BR>Horst DO1KHS<BR>____________________=
_______________________________________<BR>GRATIS f=FCr alle WEB.DE-Nutzer=
: Die maxdome Movie-FLAT!<BR>Jetzt freischalten unter <A   href=3D"http://=
movieflat.web.de/" target=3D_blank>http://movieflat.web.de</A><BR><BR></DI=
V></BLOCKQUOTE></td></tr></table><br>



     =20

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