Return-Path: Received: from mtain-dg05.r1000.mx.aol.com (mtain-dg05.r1000.mx.aol.com [172.29.65.13]) by air-dd04.mail.aol.com (v128.1) with ESMTP id MAILINDD043-865a4bc714ef117; Thu, 15 Apr 2010 09:30:23 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 28CB6380000B8; Thu, 15 Apr 2010 09:30:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O2P7O-0005KN-QC for rs_out_1@blacksheep.org; Thu, 15 Apr 2010 14:28:30 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O2P7O-0005KE-7T for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 14:28:30 +0100 Received: from mailgw9.se.ericsson.net ([193.180.251.57]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O2P7N-00023D-Bx for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 14:28:30 +0100 X-AuditID: c1b4fb39-b7b85ae000005cbc-fd-4bc7147bbf18 Received: from esealmw126.eemea.ericsson.se (Unknown_Domain [153.88.253.124]) by mailgw9.se.ericsson.net (Symantec Brightmail Gateway) with SMTP id 56.BF.23740.B7417CB4; Thu, 15 Apr 2010 15:28:27 +0200 (CEST) Received: from esealmw110.eemea.ericsson.se ([153.88.200.78]) by esealmw126.eemea.ericsson.se with Microsoft SMTPSVC(6.0.3790.3959); Thu, 15 Apr 2010 15:28:25 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Date: Thu, 15 Apr 2010 15:26:34 +0200 Message-ID: <4D95FB39404AA04CA998E7F63B1A2E5F0432C756@esealmw110.eemea.ericsson.se> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Amplifier required for LF DX/weak signals? Thread-Index: Acrcn0Tvvrs84hEtQ/Cjb0Yq4Rdmsg== From: "Daniele Tincani" To: X-OriginalArrivalTime: 15 Apr 2010 13:28:25.0554 (UTC) FILETIME=[86F42B20:01CADC9F] X-Brightmail-Tracker: AAAAAA== X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CADC9F.45816B91" Subject: LF: Amplifier required for LF DX/weak signals? 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=HTML_50_60,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-sid: 3039ac1d410d4bc714ee587f X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01CADC9F.45816B91 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi LF, =20 Quite a general question: is a pre-amplifier needed in your opinion for listening to LF weak signals (e.g. NDB DX, etc.)? I read different opinions in very famous articles on the Web: one opinion is that a bigger non-amplified loop is better than a smaller amplified loop and an amplifier should be used only if really necessary (and only with the strictly required gain). On the contrary, another famous article says that an antenna pre-amplifier is important for NDB DX, despite it mentions quite a big loop as the antenna. I'm just a beginner in LF and NDB listening with quite a simple system. I tried an homebrew amplifier together with my small loop and it seemed to me that it did not add anything but loudness to both the signal and the noise. Basically, no improvements in signal readability. What's your opinion, in particular when cheap portables (e.g. DE1103) are involved? =20 Best regards Daniele =20 ------_=_NextPart_001_01CADC9F.45816B91 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi LF,

Quite a general question: is a pre-amplifier ne= eded in your opinion for listening to LF weak signals (e.g. NDB DX, etc.)?

I read different opinions in very famous articl= es on the Web: one opinion is that a bigger non-amplified loop is better than a smal= ler amplified loop and an amplifier should be used only if really necessary (a= nd only with the strictly required gain). On the contrary, another famous art= icle says that an antenna pre-amplifier is important for NDB DX, despite it men= tions quite a big loop as the antenna. I’m just a beginner in LF and NDB listening with quite a simple system. I tried an homebrew amplifier togeth= er with my small loop and it seemed to me that it did not add anything but loudnes= s to both the signal and the noise. Basically, no improvements in signal readability= . What’s your opinion, in particular when cheap portables (e.g. DE1103) are involve= d?

Best regards

Daniele

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