Return-Path: Received: from mtain-mi11.r1000.mx.aol.com (mtain-mi11.r1000.mail.aol.com [172.21.131.169]) by air-mf03.mail.aol.com (v127_r1.1) with ESMTP id MAILINMF031-8bd94b90c99a339; Fri, 05 Mar 2010 04:06:34 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mi11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 925B638000084; Fri, 5 Mar 2010 04:06:16 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NnTSB-0003tZ-8f for rs_out_1@blacksheep.org; Fri, 05 Mar 2010 09:04:15 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NnTSA-0003tQ-EN for rsgb_lf_group@blacksheep.org; Fri, 05 Mar 2010 09:04:14 +0000 Received: from n15.bullet.mail.mud.yahoo.com ([68.142.206.42]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1NnTS9-0006Rd-RN for rsgb_lf_group@blacksheep.org; Fri, 05 Mar 2010 09:04:14 +0000 Received: from [68.142.200.226] by n15.bullet.mail.mud.yahoo.com with NNFMP; 05 Mar 2010 09:04:05 -0000 Received: from [68.142.201.68] by t7.bullet.mud.yahoo.com with NNFMP; 05 Mar 2010 09:04:05 -0000 Received: from [127.0.0.1] by omp420.mail.mud.yahoo.com with NNFMP; 05 Mar 2010 09:04:05 -0000 X-Yahoo-Newman-Id: 62068.48154.bm@omp420.mail.mud.yahoo.com Received: (qmail 41183 invoked from network); 5 Mar 2010 09:04:04 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=4Ah6uDsH6YT3629mRssk8O58/6ejPmueLaQVBcbEG1FH8UXYvcdTReycMjVRrKTr9xnXIgnSdcRRYysuJMzOeZJNH8dStz/bSsnstBA8xBXljdqSyiEVY6gFwgGEdvlbFZfvK/3zXuzAm4CZDehfw6iqe7ey1i1kiLwfj2mytTE= ; Received: from host86-134-233-48.range86-134.btcentralplus.com (ken.h.wright@86.134.233.48 with login) by smtp139.mail.mud.yahoo.com with SMTP; 05 Mar 2010 01:04:04 -0800 PST X-Yahoo-SMTP: 9Y6mUHuswBAgnrOsukIiNdFDf95uy_Dz34nY1hlg2liKgYD952sjbg-- X-YMail-OSG: yLt6sM0VM1mP4LfzLAkb9y86KjTIg4m3NaTA53FOyH7zztKON5CK_Ha5YvH.DX13JiZ.06fcdIaR3kIUeCYsx5IdzQOLmm9G7RPPh_NsGR54M7so9QJXbJ8ynFS5013JWPTKVCBSBVXsyl8N2CvSvXKmbxtKki.egdvz5dZQzd4sbPTVHPAmSXLHU9TW43yp.RfQR.BYAY_ToABbLxQoh2Goo2_DQuGreVdjfPoOVILrmsE5ijssmwojgloIPLzBcSthY.nruNGAfideIZmN0R4bRJ2eR0GfIn8N8IvjCS.nkv9sZiNC0SZyetTf5NPkNw7EodcX4PDQ5p8qA68K0nMrnNQ6_.U- X-Yahoo-Newman-Property: ymail-3 Message-ID: <463A3AAE567E41A3A73DC3787B373D42@lindavideo> From: "Ken" To: References: <754354.15151.qm@web28101.mail.ukl.yahoo.com> Date: Fri, 5 Mar 2010 09:03:59 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 DomainKey-Status: good (testing) Subject: Re: LF: 9kHz: soundcard RX Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01CABC42.CAD52470" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: *** X-Spam-Status: No, hits=3.7 required=5.0 tests=CELL_PHONE_BOOST, FORGED_MUA_OUTLOOK,HTML_20_30,HTML_MESSAGE,HTML_TAG_EXISTS_TBODY 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-sid: 3039400cded34b90c9880807 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0014_01CABC42.CAD52470 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: M0FMT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, March 04, 2010 10:51 PM Subject: Re: LF: 9kHz: soundcard RX If I have understood the issue, it is that you are saying soun= d cards are very venerable to damage when fed with an external antenna= to the mic socket? If that is the assertion then I am say that I have had a good= survival rate when doing just that over a relatively long period of= time. Also other pieces of kit are connected to antennas like very ve= ry expensive transceivers and modems connected to antenna like telepho= ne wires... there is potential hazard to all these devices. So we do= take a risk when connecting any sensitive electronic device to an ext= ernal antenna but the risk can be mitigated by ensuring the antenna is= removed when not in use and especially during lightning storms and /= or by adding some form of static bypass arrangement. And yes a pair= of back to back diodes appear to prevent damage because of their volt= age limiting characteristic. It is a precaution I would recommend as= a minimum protection but you can never be sure how well they would ac= tually work. Its a risking business play with high external antennas= but that's what we do. That is my point and nothing else.=20 73 es GL petefmt --- On Thu, 4/3/10, Chris wrote: From: Chris Subject: Re: LF: 9kHz: soundcard RX To: rsgb_lf_group@blacksheep.org Date: Thursday, 4 March, 2010, 16:25 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 use. Two back to back diodes on the antenna lead close to th= e input plug. Don't leave it connected during thunderstorms. Most mode= ms are left connected day and night to very very long over head teleph= one wires for years with out problems. Vastly over hyped problem. 73 es GL petefmt --- On Wed, 3/3/10, Horst St=F6cker wrote: From: Horst St=F6cker 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 supre= ss the 50Hz and it's harmonics? Necessary or dispensable? You can hear (!) the difference. I just took a 10m= H coil from Reichelt to improve my soundcard-RX before one of the last= SAQ activities. Despite of more or less excellent digital filterin= g 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 tr= ansformer. 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 ta= ke a cheap soundcard instead of the audio transformer - and maybe a se= cond 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 =20 ------=_NextPart_000_0014_01CABC42.CAD52470 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 M0FMT=
Sent: Thursday, March 04, 201= 0 10:51=20 PM
Subject: Re: LF: 9kHz: soundc= ard RX

If I have understood the issue, it is that you are= saying=20 sound cards are very venerable to damage when fed with an exte= rnal=20 antenna to the mic socket?
If that is the assertion then I am say that I have had a= good=20 survival rate when doing just that over a relatively long peri= od of=20 time. Also other pieces of kit are connected to antennas= like very=20 very expensive transceivers and modems connected to anten= na like=20 telephone wires... there is potential hazard to all these devi= ces. So we=20 do take a risk when connecting any sensitive electronic device= to an=20 external antenna but the risk can be mitigated by ensuring the= antenna=20 is removed when not in use and especially during lightning sto= rms and /=20 or by adding some form of static bypass arrangement. And yes= a pair of=20 back to back diodes appear to prevent damage because of= their=20 voltage limiting characteristic. It is a precaution I wou= ld=20 recommend as a minimum protection but you can never be sure ho= w well=20 they would actually work. Its a risking business play with hig= h external=20 antennas but that's what we do.
 
That is my point and nothing else. 

73 es=20 GL petefmt

--- On Thu, 4/3/10, Chris=20 <c.ashby435@btinternet.com> wrote:

From:=20 Chris <c.ashby435@btinternet.com>
Subject: Re: LF:= 9kHz:=20 soundcard RX
To: rsgb_lf_group@blacksheep.org
Date: Th= ursday, 4=20 March, 2010, 16:25

Not sure what your point is= , surely=20 you're just saying the diodes are doing their job?
Chris, G4AYT.
----- Original Message ---= --
Fr= om: M0FMT
Sent: Thursday, Mar= ch 04, 2010=20 7:07 AM
Subject: Re: LF: 9k= Hz:=20 soundcard RX

=
never blown a sound card up yet in ov= er almost=20 ten years of use. Two back to back diodes on the ant= enna lead=20 close to the input plug. Don't leave it connected du= ring=20 thunderstorms. Most modems are left connected day an= d night to=20 very very long over head telephone wires for years= with out=20 problems. Vastly over hyped problem.

73 es GL= =20 petefmt

--- On Wed, 3/3/10, Horst St=F6cke= r=20 <horst.stoecker@web.de> wrote:

F= rom:=20 Horst St=F6cker <horst.stoecker@web.de>
S= ubject: LF:=20 9kHz: soundcard RX
To:=20 rsgb_lf_group@blacksheep.org
Date: Wednesday,= 3 March,=20 2010, 9:32

>And what about a simple= band pass=20 filter to supress the 50Hz and it's harmonics? Nec= essary or=20 dispensable?

You can hear (!) the differenc= e. I just=20 took a 10mH coil from Reichelt to improve my sound= card-RX=20 before one of the last SAQ activities.

Desp= ite of=20 more or less excellent digital filtering of SpecLa= b it's a=20 good idea. One should not keep the soundcard busy= with=20 unwanted signals.

What I am not sure about= is the use=20 of an audio transformer. It might have some influe= nce to the=20 signal. As it just has to keep the soundcard from= beeing=20 blown it might be a good idea to take a cheap soun= dcard=20 instead of the audio transformer - and maybe a sec= ond in=20 spare.

Stefan, what USB-soundcard you bough= t for 10=20 EUR ?

Horst=20 DO1KHS
________________________________________= ___________________
GRATIS=20 f=FCr alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!<= BR>Jetzt=20 freischalten unter http://movieflat.web.de



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