Return-Path: Received: from rly-da05.mx.aol.com (rly-da05.mail.aol.com [172.19.129.79]) by air-da06.mail.aol.com (v121.4) with ESMTP id MAILINDA064-a6a478f09a39b; Thu, 17 Jan 2008 02:54:19 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da05.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDA052-a6a478f09a39b; Thu, 17 Jan 2008 02:54:13 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JFPZK-00008y-EF for rs_out_1@blacksheep.org; Thu, 17 Jan 2008 07:53:46 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JFPZJ-00008n-Ql for rsgb_lf_group@blacksheep.org; Thu, 17 Jan 2008 07:53:45 +0000 Received: from ug-out-1314.google.com ([66.249.92.174]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JFPZG-0005PB-1f for rsgb_lf_group@blacksheep.org; Thu, 17 Jan 2008 07:53:45 +0000 Received: by ug-out-1314.google.com with SMTP id a2so401279ugf.13 for ; Wed, 16 Jan 2008 23:53:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:reply-to:to:references:subject:date:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:x-mimeole:from; bh=xwzR8Qy5a2CNU1K31R//t/+tAzSiehcHyXhAxIHI0v8=; b=ua9Pa5FYWypWepK7HPcvT4//0U1bPCIUBSU8LeMISlZuZYDmJ7yuHMI9CVr5lPwBvILHJ9xi4lvNGK31B5An4k9Aq3F/a5OoIG/aqSSBTaSc8n4u4RIalhF+nUCWr2R5SW5beDAsfqCWFYTH8+F4owRbuASkhYv9XlxrjgP+xx4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:reply-to:to:references:subject:date:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:x-mimeole:from; b=ZDpm61Cl0ce4pfVCy7/nPn8SfvYhdnCRn8nQeKnXIZ/MNz5IxDn7qaQd+kWYcVe3bUnXyzybLbIBNVCuXo20VXoZWH5GLcHSAuMEs1WySPKF0e49Y0MV2dJGJz8wGRag52dI54B/pgGC59x0gwLW3C1bNPqZwO8vBrcT7IV1Sn4= Received: by 10.67.92.20 with SMTP id u20mr3059945ugl.71.1200556421312; Wed, 16 Jan 2008 23:53:41 -0800 (PST) Received: from Neptune ( [87.194.205.174]) by mx.google.com with ESMTPS id p34sm2551513ugc.46.2008.01.16.23.53.39 (version=SSLv3 cipher=RC4-MD5); Wed, 16 Jan 2008 23:53:40 -0800 (PST) Message-ID: <004201c858de$1303f6b0$6401a8c0@Neptune> To: References: <933932.3248.qm@web28111.mail.ukl.yahoo.com> Date: Thu, 17 Jan 2008 07:53:38 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 From: Jan Verduyn DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: LF Receiver Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C858DE.11E12190" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : ? X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d088.1 ; domain : gmail.com DKIM = 3 ------=_NextPart_000_003F_01C858DE.11E12190 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Peter, Can you please provide some details of the Softrock mod by Jim M0BMU coverin= g the two LF bands. Thanks. I am using a Softrock lite here on 500 Khz using a 4096 Khz Crystal and can=20= confirm sensitivity is good, however a better input filter maybe needed in some locations as there is som= e breakthrough from strong Local Broadcast stations (Radio Bristol) mixing w= ith the 2nd harmonic of the LO. Ie 1548 - (2 x 512 ) =3D 524 Khz =3D +12 Kh= z In the Softrock the image is audible when tuned to 500 Khz (-12 Khz) 73s Jan G0BBL ----- Original Message -----=20 From: Peter March=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, January 16, 2008 4:04 PM Subject: Re: LF: LF Receiver Hi Laurie It is great to see a technical discussion on the reflector. It's much bett= er than using the reflector as purely the return path of a one way VLF qso! I have been using a Tony Parks' KB9YIG Soft Rock SDR RX (about =A320 kit f= rom WS) for some time now. I use the excellent free SDR application softwar= e from Duncan Munro M0KGK 1.1 with Cesco's HB9TLK.DLL (Loop.DLL) VAC (Virtu= al Audio Cable) software link to Patrick Lindecker F6CTE's Multpsk 4.2 decod= er software. Soft Rock does use the IQ sound card input but this way only t= he one card is needed. The results are incredible for such a small out lay.=20= I think this setup outperforms most conventional RX in terms of selectivity=20= and ease of use over a limited spectrum, 48kHz using built in soundcards and= 96kHz using a high quality int /ext Soundcard. 136 and 500 kHz bands are o= nly about 3 kHz wide so it gives ample coverage of the EU and US beacon freq= uencies as well. Please also note that Jim Moritz M0BMU has done an excellen= t mod to the current Soft rock 6.2 kit that gives these two bands as they ar= e not standard in the Soft rock kit range. ------=_NextPart_000_003F_01C858DE.11E12190 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Peter,
 
Can you please provide some details of= the=20 Softrock mod by Jim M0BMU covering the two LF bands.
 
Thanks.
 
I am using a Softrock lite here o= n 500=20 Khz using a 4096 Khz Crystal and can confirm sensitivity=20 is good,
however a better=20 input filter maybe needed in some locations as there is some=20 breakthrough from strong Local Broadcast stations (Radio=20 Bristol) mixing with the 2nd harmonic of the LO.  Ie 154= 8 -=20 (2 x 512 ) =3D 524 Khz =3D +12 Khz
In the Softrock the image is audible&n= bsp;when=20 tuned to 500 Khz (-12 Khz)
 
73s
 
Jan G0BBL
 
 
----- Original Message -----
Peter March= =20
Sent: Wednesday, January 16, 2008 4= :04=20 PM
Subject: Re: LF: LF Receiver

Hi=20 Laurie
It=20 is great to see a technical discussion on the reflector. It=92s much bette= r than=20 using the reflector as purely the return path of a one way VLF=20 qso!
I=20 have been using a Tony=20 Parks=92 KB9YIG Soft Rock SDR RX (abo= ut =A320 kit=20 from WS) for some time now.  I use=20 the excellent free SDR application software from Duncan Munro M0KGK 1.1 wi= th=20 Cesco=92s=20  HB9TLK.DLL (Loop.DLL) VAC (Virtual=20 Audio Cable) software link to Patrick Lindecker F6CTE=92s Multpsk 4.2 deco= der=20 software.  Soft Rock does us= e the=20 IQ sound card input but this way only the one card is needed. The results=20= are=20 incredible for such a small out lay. I think this setup outperforms most=20 conventional RX in terms of selectivity and ease of use over a limited=20 spectrum, 48kHz using built in soundcards and 96kHz using a high quality i= nt=20 /ext  Soundcard. 136 and 500= kHz=20 bands are only about 3 kHz wide so it gives ample coverage of the EU and U= S=20 beacon frequencies as well. Please also note that Jim Moritz M0BMU has don= e an=20 excellent mod to the current Soft rock 6.2 kit that gives these two bands=20= as=20 they are not standard in the Soft rock kit=20 range.
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