X-GM-THRID: 1218024062545319400 X-Gmail-Labels: rsgb lf X-Gmail-Received: 76a2ce00290fff5991d685f6458b7eb8f15738f8 Delivered-To: daveyxm@gmail.com Received: by 10.78.205.5 with SMTP id c5cs616444hug; Mon, 23 Oct 2006 03:11:05 -0700 (PDT) Received: by 10.67.119.9 with SMTP id w9mr5534555ugm; Mon, 23 Oct 2006 03:11:05 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id m4si940751ugc.2006.10.23.03.11.04; Mon, 23 Oct 2006 03:11:05 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Gbwed-00007z-Bh for rs_out_1@blacksheep.org; Mon, 23 Oct 2006 11:03:35 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Gbwec-00007q-PK for rsgb_lf_group@blacksheep.org; Mon, 23 Oct 2006 11:03:34 +0100 Received: from imo-m18.mx.aol.com ([64.12.138.208]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Gbweb-0000ug-Kp for rsgb_lf_group@blacksheep.org; Mon, 23 Oct 2006 11:03:34 +0100 Received: from MarkusVester@aol.com by imo-m18.mx.aol.com (mail_out_v38_r7.6.) id l.413.17d46eee (52325) for ; Mon, 23 Oct 2006 06:02:04 -0400 (EDT) Received: from WEBMAIL-DC19 (webmail-dc19.webmail.aol.com [205.188.149.41]) by ciaaol-d03.mail.aol.com (v113.6) with ESMTP id MAILCIAAOLD037-cc65453c931c9f; Mon, 23 Oct 2006 06:02:04 -0400 References: <453C693D.7070905@online.fr> To: rsgb_lf_group@blacksheep.org Date: Mon, 23 Oct 2006 06:02:04 -0400 In-Reply-To: <453C693D.7070905@online.fr> X-MB-Message-Source: WebUI MIME-Version: 1.0 From: markusvester@aol.com X-MB-Message-Type: User X-Mailer: AOL eMail 20836 Received: from 217.194.34.103 by WEBMAIL-DC19.sysops.aol.com (205.188.149.41) with HTTP (WebMailUI); Mon, 23 Oct 2006 06:02:04 -0400 Message-Id: <8C8C4A16CEF955A-83C-ADF8@WEBMAIL-DC19.sysops.aol.com> X-AOL-IP: 205.188.149.41 X-Spam-Flag: NO X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,AWL=-1.373,HTML_10_20=0.945,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: LF: TA Grabber modifications Content-Type: multipart/mixed; boundary="--------MB_8C8C4A16CED3302_83C_1437B_WEBMAIL-DC19.sysops.aol.com" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_MESSAGE,NO_REAL_NAME 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 Status: O X-Status: X-Keywords: X-UID: 3904 ----------MB_8C8C4A16CED3302_83C_1437B_WEBMAIL-DC19.sysops.aol.com Content-Type: multipart/alternative; boundary="--------MB_8C8C4A16CED3302_83C_1437C_WEBMAIL-DC19.sysops.aol.com" ----------MB_8C8C4A16CED3302_83C_1437C_WEBMAIL-DC19.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Dear LF, many thanks to Wolfgang and Jean-Pierre for their hints on optimizing SpecLab settings for improved TA reception. I have now adopted the fast AGC following a 50 Hz wide filter, which seems to handle QRN quite a bit better than the original wideband noise blanker. It looks like I also finally managed to get some aerial directivity. I have used a second pair of large loops and combined their signals in a small goniometer, sitting on the desk. It consists of two closely spaced ferrite rings having two windings across them, without going through the core hole (see pic). The weighted combination is then added in phase to the E-field signal, at about 80% amplitude. This results in a rotatable cardioid pattern with ~ 19dB F/B ratio. As this addition does not introduce a phase term (at least not in theory), the RDF principle should still work, even near the back of the beam. Steering northeast now, I seem to get a significant reduction of QRN, as well as some relief from the Budapest stuff. And here comes a signal on 137779.85 - looks like XGJ who started at 23:10. 73 and best of luck Markus, DF6NM http://members.aol.com/df6nm/Grabber.htm ----------MB_8C8C4A16CED3302_83C_1437C_WEBMAIL-DC19.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"
Dear LF,
 
many thanks to Wolfgang and Jean-Pierre for their hints on optimizing SpecLab settings for improved TA reception. I have now adopted the fast AGC following a 50 Hz wide filter, which seems to handle QRN quite a bit better than the original wideband noise blanker.
 
It looks like I also finally managed to get some aerial directivity. I have used a second pair of large loops and combined their signals in a small goniometer, sitting on the desk. It consists of two closely spaced ferrite rings having two windings across them, without going through the core hole (see pic). The weighted combination is then added in phase to the E-field signal, at about 80% amplitude. This results in a rotatable cardioid pattern with ~ 19dB F/B ratio. As this addition does not introduce a phase term (at least not in theory), the RDF principle should still work, even near the back of the beam.
 
Steering northeast now, I seem to get a significant reduction of QRN, as well as some relief from the Budapest stuff. And here comes a signal on 137779.85 - looks like XGJ who started at 23:10.
 
73 and best of luck
 
Markus, DF6NM
http://members.aol.com/df6nm/Grabber.htm
 
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