Return-Path: Received: from mtain-me07.r1000.mx.aol.com (mtain-me07.r1000.mx.aol.com [172.29.96.143]) by air-df01.mail.aol.com (v129.4) with ESMTP id MAILINDF012-5ee34c161ada23f; Mon, 14 Jun 2010 08:04:42 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-me07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8850D380000F4; Mon, 14 Jun 2010 08:04:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OO8Mz-00052p-Iz for rs_out_1@blacksheep.org; Mon, 14 Jun 2010 13:02:25 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OO8My-00052g-TG for rsgb_lf_group@blacksheep.org; Mon, 14 Jun 2010 13:02:24 +0100 Received: from web28103.mail.ukl.yahoo.com ([217.146.182.123]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OO8My-0004yl-Nw for rsgb_lf_group@blacksheep.org; Mon, 14 Jun 2010 13:02:24 +0100 Received: (qmail 56247 invoked by uid 60001); 14 Jun 2010 12:02:18 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1276516938; bh=OG/wC+A8OVsv49MwtWSr7tSExXTUkatZoOJRbzsH2Mc=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=tLHUyp//UB3PQ0TLMmvodbxIQilFfHLry/6Q17/sKVKRJM8O7Z9zjOzMqRPsid4cv0+ssx1RQDUDBxP1pz/pXWxnXN/yV2PYwds/u07qJ7wPvK91fhx7FwAIwrfCLgpFoMPtBBGbYXLcIH6hUmLALbSg8ZEzpJoScf3M+wsp2as= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=mu36/A2pJeEjIzqsu+ZJxIOW6ikEoWR4vU0U03TpBfyL0W0uMTko/A2jP5jhrsmr3cmBcN7IeyTG5BZ2ECEc0s2yzCXKS4Srdl2Vd+uSL/RWHUkXEQQ/fgxTZN79W5J6Pq1SzWlyLgfNNeOXl6N7TOXL9lRq8BNAPetDbnJzQAM=; Message-ID: <130267.55592.qm@web28103.mail.ukl.yahoo.com> X-YMail-OSG: uphpJT0VM1kE.35LlGrOscubn9LEEwWZgmBbJk8iBJkC4pi 3QlNyAY9jghQz2UkJDtgUoc0CVccK2uCysiA5ayZsx.QpVW72y.wdoyOiYn0 GTdXl7Cjm..zGS9EnDmeQcHjO.R74Ek5wy_vzNkNaHktgBWticczRH5GWd_e RIT5rrHKJAfqXCsbXFFGwPjs75b8SqsjqymuGcETOkmseMmWDTrudPn6a9ms UL3phG42I4vo3zCT9apmpcjOfOG5AcH87FFZEku.C2fEMrSu4.w-- Received: from [86.137.246.158] by web28103.mail.ukl.yahoo.com via HTTP; Mon, 14 Jun 2010 05:02:17 PDT X-Mailer: YahooMailClassic/11.1.3 YahooMailWebService/0.8.103.269680 Date: Mon, 14 Jun 2010 05:02:17 -0700 (PDT) From: M0FMT To: rsgb_lf_group@blacksheep.org In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1C4C@File-Server-HST.hst.e-technik.tu-darmstadt.de> MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: AW: RE: RE: Static protection when using a soundcard as an Rx Content-Type: multipart/alternative; boundary="0-89876040-1276516937=:55592" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=EXCUSE_16,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m225.2 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039ac1d608f4c161ad50598 X-AOL-IP: 193.82.116.20 --0-89876040-1276516937=:55592 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi LF =A0 I agree fully with Eddie's and Stefan's description=A0in the use of protec= tion diodes. Back to back is a loose term and I tend to use it. However I= try to accompany my comments with a circuit diagram to illustrate the poi= nt (not so easy on Blacksheep). =A0 Could I also add that static or local lightning strike=A0may not necessari= ly be=A0the worst enemy=A0 of this type of sound card use, because you nor= mally know they are about and disconnect. If you are like me and have vari= ous antennas up along side or near to the LF Marconi very strong field str= engths (voltages) can be induced into the LW when operating a TX on anothe= r bands =A0 OK OK I am expecting the usual perfect ops to say I should not have many= antennas up at the same time, one degrades the other etc etc... but it is= a fact of life so it is worth remembering this issue in protecting your= sound card input. I have been thinking of screened=A0hi Q=A0traps right= against the SC input.=A0 73 es GL petefmt I support www.NotSpotTelecom.Com your community Telco / ISP. --- On Mon, 14/6/10, Stefan Sch=E4fer wrote= : From: Stefan Sch=E4fer Subject: LF: AW: RE: RE: Static protection when using a soundcard as an Rx To: rsgb_lf_group@blacksheep.org Date: Monday, 14 June, 2010, 11:20 Hi Eddie, "Antiparallel" is the description i normally use and i most often heard fo= r such arrangements. :-) 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 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. 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. Eddie G3ZJO -----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 Hi Brian and also welcome :-) 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... 73 es gl becoming QRV!! Stefan/DK7FC ________________________________ 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 Welcome to the reflector.=A0=A0=A0Back to back diodes are good option to= limit surges and spikes, but others are more qualified than me to advise With best regards Jim Dr. James Cowburn=A0 G7NKS E james.cowburn@virgin.net The information transmitted is intended only for the person to whom it is= addressed and may contain confidential and/or privileged material. If you= are not the intended recipient, you are hereby notified that you must not= read this message. Any review, retransmission, dissemination or other use of, or taking of an= y action in reliance upon, this information by persons or entities other= than the intended recipient is prohibited.=A0 Consequently, this email is= not intended to be contractually binding. If you received this in error, please contact the sender, return the messa= ge as well as its attachments and delete the whole from any computer. ________________________________ 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 Hi All,=20 My first post to the reflector. 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 Normally I'd add a "dc short" with an inductor but at 10kHz than is a big= inductor. A resistor is another options. Does anyone have any other suggestions, please. 73 Brian =20 --0-89876040-1276516937=:55592 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi LF
 
I agree fully with Eddie's and Stefan's description in the use= of protection diodes. Back to back is a loose term and I tend to use it.= However I try to accompany my comments with a circuit diagram to illustra= te the point (not so easy on Blacksheep).
 
Could I also add that static or local lightning strike may not= necessarily be the worst enemy  of this type of sound card use,= because you normally know they are about and disconnect. If you are like= me and have various antennas up along side or near to the LF Marconi very= strong field strengths (voltages) can be induced into the LW when operati= ng a TX on another bands
 
OK OK I am expecting the usual perfect ops to say I should not have= many antennas up at the same time, one degrades the other etc etc... but= it is a fact of life so it is worth remembering this issue in protecting= your sound card input. I have been thinking of screened hi Q tr= aps right against the SC input. 

73 es GL petefmt=

I support www.NotSpotTelecom.Com your community Telco / ISP.
--- On Mon, 14/6/10, Stefan Sch=E4fer <schaefer@hst.tu-darmstad= t.de> wrote:

From: Stefan Sch=E4fer <schaefer@hst.tu-dar= mstadt.de>
Subject: LF: AW: RE: RE: Static protection when using a= soundcard as an Rx
To: rsgb_lf_group@blacksheep.org
Date: Monday,= 14 June, 2010, 11:20

Hi Eddie,

"Antiparallel" is the description= i normally use and i most often heard for such arrangements. :-)

7= 3, Stefan

________________________________

Von: owner-rsgb_l= f_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 protecti= on when using a soundcard as an Rx



Hi All



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.



Incidentally it= has suddenly struck me what a loose term 'back to back' diodes is. It cou= ld 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 in= put would do nothing to protect the circuit. Joining the open ends and pla= cing that across the input would not be right either.




<= BR>Eddie G3ZJO



-----Original Message-----
From: Stefan= Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of St= efan 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



Hi Brian and al= so welcome :-)



I would combinate back to back diodes with= a isolating transformer for audio. A combination of the hints you heared= before ;-) The transformer prevents galvanic coupling (could become a pro= blem even if your wire is grounded for high voltages by the diodes) and th= e diodes on the soundcard side are an additional safety factor that reduce= s voltage spikes. But the diodes start to conduct already at some 1/10 vol= ts (depending on the temperature) so you may use 2 in series each...


73 es gl becoming QRV!!



Stefan/DK7FC


<= BR>________________________________

Von: owner-rsgb_lf_group@blacks= heep.org im Auftrag von James Cowburn
Gesendet: So 13.06.2010 20:09=
An: rs= gb_lf_group@blacksheep.org
Betreff: LF: RE: Static protection when= using a soundcard as an Rx

Hi Brian



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








With best regards





= Jim





Dr. James Cowburn  G7NKS

E james.cowburn@virgin.net



The information transmitted is intended only for the pers= on to whom it is addressed and may contain confidential and/or privileged= material. If you are not the intended recipient, you are hereby notified= that you must not read this message.
Any review, retransmission, dissemination or other use of, or= taking of any action in reliance upon, this information by persons or ent= ities other than the intended recipient is prohibited.  Consequently,= this email is not intended to be contractually binding.
If you receive= d this in error, please contact the sender, return the message as well as= its attachments and delete the whole from any computer.

__________= ______________________

From: owner-rsgb_lf_group@blacksheep.org= [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Brian ReaySent: 13 June 2010 17:38
To: rsgb_lf_group@blacksheep.org
Subject: LF:= Static protection when using a soundcard as an Rx



Hi All,=



My first post to the reflector.



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 concerned re= static.





Normally I'd add a "dc short" with an ind= uctor but at 10kHz than is a big inductor. A resistor is another options.<= BR>


Does anyone have any other suggestions, please.


=
73

Brian



=20 --0-89876040-1276516937=:55592--