Return-Path: Received: from mtain-me06.r1000.mx.aol.com (mtain-me06.r1000.mx.aol.com [172.29.96.142]) by air-de05.mail.aol.com (v127_r1.1) with ESMTP id MAILINDE053-5eb44b912d5417f; Fri, 05 Mar 2010 11:12:04 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-me06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7F2AC38000090; Fri, 5 Mar 2010 11:12:02 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nna7C-0004mE-12 for rs_out_1@blacksheep.org; Fri, 05 Mar 2010 16:11:02 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nna7B-0004m5-CN for rsgb_lf_group@blacksheep.org; Fri, 05 Mar 2010 16:11:01 +0000 Received: from web28105.mail.ukl.yahoo.com ([217.146.182.125]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1Nna7B-0001Up-69 for rsgb_lf_group@blacksheep.org; Fri, 05 Mar 2010 16:11:01 +0000 Received: (qmail 4998 invoked by uid 60001); 5 Mar 2010 16:10:55 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1267805455; bh=SKYKdALuZFgiwYaGNGH1VCriSCJIYmrg36Pgn8UqgMo=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=ssi6XFENv8rxUK+gqmTT2OWFO6JgAzVv2AT5aN+ZAMOG68Nh8eBCkJVJnS35mQmXDsEHb7LcMt9aH17yfWxx+FvfqMHdC8io2tgLHpzkvXxqNJOow11W90td4yV0R/tXFQR2O00//3f7MROqefj+uVd416eNdBcEDN19ML46V50= 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:MIME-Version:Content-Type; b=HiAkmcqgfm4RvQIlxrh35j8Vb6pemcXSY3oRka/7YJWy8IxXpqe7lcGq1nIbX8qmup8osq00IaXxGlXNrLVV6V1YYeQc19XBlfQJDDsls0nSsSu7PPnMuGOyw9pX0By4RYjEhhYX2W8Qm47KHS0Skm+afbEpqQFnO/rlVDFIoQU=; Message-ID: <105731.4209.qm@web28105.mail.ukl.yahoo.com> X-YMail-OSG: v_0UXV8VM1lfLTEbOYCoGA84uIiyrG2wkPbXblQAN1ewaAx wLs9LnU3cqcfkuMJVyW6oWY8Hoq35_Y8amdi.NavctHQZxCkcTy7SK0z4IDo clGpDbyU0zc15gPxCH2z7bHZ8Dc3h2SwU3H78X.D3ROMs3Zx6uuaqQm_703Z Jo.9ApRjolOdSf_0ChUl5ds_pJIkxf2Lwg5DeAbqkLJ6fGXl37TxJjPQ7XPL h_zZLJYAIJnL8PU_AF11Idz_Bk9pfxMKdbsjDyN0oJI88tVINJKDb1H_pBNs 9rhgJ2qoeSV5huiYRT1FxRzqL Received: from [86.143.244.65] by web28105.mail.ukl.yahoo.com via HTTP; Fri, 05 Mar 2010 08:10:54 PST X-Mailer: YahooMailClassic/9.2.12 YahooMailWebService/0.8.100.260964 Date: Fri, 5 Mar 2010 08:10:54 -0800 (PST) From: M0FMT To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: 9kHz: soundcard RX Content-Type: multipart/alternative; boundary="0-339709652-1267805454=:4209" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.2 required=5.0 tests=CELL_PHONE_BOOST,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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m280.2 ; domain : yahoo.co.uk DKIM : pass x-aol-sid: 3039ac1d608e4b912d5272f5 X-AOL-IP: 193.82.116.20 --0-339709652-1267805454=:4209 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Ken =A0 OK on the Sound card RX I will send you some details via direct mail=A0off= list. However I am happy to explain to anyone how it is done. You can check out this site for an SAQ dedicated SC RX... http://web.telia= .com/~u33233109/saqrx/saqrx.html =A0by Johan SM6LKM=20 =A0 Also just use Winrad software by Alberto I2PHD ...... http://www.winrad.or= g/.. version 1.32 will give you more facilities than the dedicated SAQ RX.= Although designed for use with SDR hardware it also works as a stand alon= e RX. =A0 You will get the idea from just playing with these applications. It will= allow you to receive most of the VLF transmissions in the range 0Hz theor= etically to either 24kHz or 48Khz depending upon the newness of your sound= card but either will do for this work..=20 =A0 I will send you some more info by direct mail Ken. 73 es GL petefmt --- On Fri, 5/3/10, Ken wrote: From: Ken Subject: Re: LF: 9kHz: soundcard RX To: rsgb_lf_group@blacksheep.org Date: Friday, 5 March, 2010, 9:14 Hello Pete and others. I would be gratefull (and probably many others)=A0if someone could write= some very simple one liners on what is required and how to use a sound ca= rd for a 9kHz=A0RX. Don't need pages of computer gobbledegook, just the KI= SS system 'Keep It Simple Stupid', with no disrespect to others. The 9kHz dc rx is coming on well and will soon be operational, time permit= ting. =A0 73s =A0 Ken=A0=A0 M0KHW=A0 ----- 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=A0is that you are saying sound cards ar= e very venerable to damage when fed with an external antenna to the mic so= cket? If that is the assertion then I am say that I have had a good survival rat= e when doing just that over a relatively long period of time. Also other= pieces of kit are connected to=A0antennas like very very expensive=A0tran= sceivers and modems connected to antenna like telephone wires... there is= potential hazard to all these devices. So we do take a risk when connecti= ng any sensitive electronic device to an external antenna but the risk can= be mitigated by ensuring the antenna is removed when not in use and espec= ially during lightning storms and / or by adding some form of static bypas= s arrangement. And yes a pair of back to back=A0diodes appear to prevent= damage because of their voltage limiting characteristic. It is a precauti= on=A0I would recommend as a minimum protection but you can never be sure= how well they would actually work. Its a risking business play with high= external antennas but that's what we do. =A0 That is my point and nothing else.=A0 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 doin= g 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 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 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 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 --0-339709652-1267805454=:4209 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Ken
 
OK on the Sound card RX I will send you some details via direct mail&= nbsp;off list. However I am happy to explain to anyone how it is done.
You can check out this site for an SAQ dedicated SC RX... http://web.telia.com/~u3= 3233109/saqrx/saqrx.html
 by Johan SM6LKM
 
Also just use Winrad software by Alberto I2PHD ...... http://www.winrad.org/.. version 1.32 will give yo= u more facilities than the dedicated SAQ RX. Although designed for use wit= h SDR hardware it also works as a stand alone RX.
 
You will get the idea from just playing with these applications. It= will allow you to receive most of the VLF transmissions in the range 0Hz= theoretically to either 24kHz or 48Khz depending upon the newness of your= sound card but either will do for this work..
 
I will send you some more info by direct mail Ken.

73 es GL pe= tefmt

--- On Fri, 5/3/10, Ken <ken.h.wright@btinternet.com= > wrote:

From: Ken <ken.h.wright@btinternet.com><= BR>Subject: Re: LF: 9kHz: soundcard RX
To: rsgb_lf_group@blacksheep.org=
Date: Friday, 5 March, 2010, 9:14

Hello Pete and others.
I would be gratefull (and probably many= others) if someone could write some very simple one liners on what= is required and how to use a sound card for a 9kHz RX. Don't need pa= ges of computer gobbledegook, just the KISS system 'Keep It Simple Stupid'= , with no disrespect to others.
The 9kHz dc rx is coming on well and will= soon be operational, time permitting.
 
73s
 
Ken   M0KHW 
----- Original Message -----
From: M0FMT
Sent: Thursday, March 04, 2010 10:5= 1 PM
Subject: Re: LF: 9kHz: soundcard RX=

If I have understood the issue, it is that you are saying sound= 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 surviva= l rate when doing just that over a relatively long period of time. Also ot= her pieces of kit are connected to antennas like very very expensive&= nbsp;transceivers and modems connected to antenna like telephone wires...= there is potential hazard to all these devices. So we do take a risk when= connecting any sensitive electronic device to an external 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 st= atic bypass arrangement. And yes a pair of back to back diodes appear= to prevent damage because of their voltage limiting characteristic. It is= a precaution I would recommend as a minimum protection but you can= never be sure how well they would actually work. Its a risking business= play with high external antennas but that's what we do.
 
That is my point and nothing else. 

73 es GL= petefmt

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

From: Chris <c.ashby435@btinternet.com><= BR>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'r= e just saying the diodes are doing their job?
Chris, G4AYT.
----- Original Message -----
From: M0FMT
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 the input pl= ug. Don't leave it connected during thunderstorms. Most modems are left co= nnected day and night to very very long over head telephone wires for year= s with out problems. Vastly over hyped problem.

73 es GL petefmt
--- On Wed, 3/3/10, Horst St=F6cker <horst.stoecker@web.de&g= t; wrote:

From: Horst St=F6cker <horst.stoecker@web.d= e>
Subject: LF: 9kHz: soundcard RX
To: rsgb_lf_group@blacksheep.o= rg
Date: Wednesday, 3 March, 2010, 9:32

>And what about a simple band pass filter to sup= ress the 50Hz and it's harmonics? 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 au= dio transformer - and maybe a second in spare.

Stefan, what USB-sou= ndcard 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<= /A>


<= /DIV>


=20 --0-339709652-1267805454=:4209--