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Date: Mon, 14 Jun 2010 12:20:03 +0200
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1C4C@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: RE: Static protection when using a soundcard as an Rx
Thread-Index: AcsLFwsvNbvxd6xHQq2bN+XXQhQ76QADFRbgAAm6r1cAE6xrAAAEitl4
References: <000001cb0b9c$3aff6190$0202a8c0@laptopcore2>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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	boundary="----_=_NextPart_001_01CB0BAB.7579AAD2"
Subject: LF: AW: RE: RE: Static protection when using a soundcard as an Rx
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Hi Eddie,
=20
"Antiparallel" is the description i normally use and i most often heard fo=
r such arrangements. :-)
=20
73, Stefan

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von g3zjo
Gesendet: Mo 14.06.2010 10:33
An: rsgb_lf_group@blacksheep.org
Betreff: LF: RE: RE: Static protection when using a soundcard as an Rx



Hi All

=20

I think I will add a 600ohm 1:1 transformer to my sound card LF set up in=
 addition to the diodes I have at present.

=20

Incidentally it has suddenly struck me what a loose term 'back to back' di=
odes is. It could be confusing for an enquirer. What is being referred to=
 here is 2 diodes in parallel across the input, one of them one connected=
 one way round and one the other.

Back to back diodes is also a term for two diodes in series connected + to=
 + or - to -, putting the open ends of this combination across the input=
 would do nothing to protect the circuit. Joining the open ends and placin=
g that across the input would not be right either.

=20

=20

Eddie G3ZJO

=20

-----Original Message-----
From: Stefan Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org] On Beha=
lf Of Stefan Sch=E4fer
Sent: 13 June 2010 23:54
To: rsgb_lf_group@blacksheep.org
Subject: AW: RE: Static protection when using a soundcard as an Rx

=20

Hi Brian and also welcome :-)

=20

I would combinate back to back diodes with a isolating transformer for aud=
io. A combination of the hints you heared before ;-) The transformer preve=
nts galvanic coupling (could become a problem even if your wire is grounde=
d for high voltages by the diodes) and the diodes on the soundcard side ar=
e an additional safety factor that reduces voltage spikes. But the diodes=
 start to conduct already at some 1/10 volts (depending on the temperature=
) so you may use 2 in series each...

=20

73 es gl becoming QRV!!

=20

Stefan/DK7FC

=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von James Cowburn
Gesendet: So 13.06.2010 20:09
An: rsgb_lf_group@blacksheep.org
Betreff: LF: RE: Static protection when using a soundcard as an Rx

Hi Brian

=20

Welcome to the reflector.   Back to back diodes are good option to limit=
 surges and spikes, but others are more qualified than me to advise

=20

=20

=20

=20

With best regards

=20

=20

Jim

=20

=20

Dr. James Cowburn  G7NKS

E james.cowburn@virgin.net

=20

The information transmitted is intended only for the person to whom it is=
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Any review, retransmission, dissemination or other use of, or taking of an=
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________________________________

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@black=
sheep.org] On Behalf Of Brian Reay
Sent: 13 June 2010 17:38
To: rsgb_lf_group@blacksheep.org
Subject: LF: Static protection when using a soundcard as an Rx

=20

Hi All,=20

=20

My first post to the reflector.

=20

I plan to try using a sound card and a "long wire" (well as long as I can=
 fit into the garden) antenna and later a kit lofted antenna but I'm conce=
rned re static.=20

=20

=20

Normally I'd add a "dc short" with an inductor but at 10kHz than is a big=
 inductor. A resistor is another options.

=20

Does anyone have any other suggestions, please.

=20

73

Brian

=20

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