Return-Path: Received: from mtain-dc05.r1000.mx.aol.com (mtain-dc05.r1000.mx.aol.com [172.29.64.133]) by air-di08.mail.aol.com (v128.1) with ESMTP id MAILINDI083-eb684bc71a03f3; Thu, 15 Apr 2010 09:52:03 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 25777380000A2; Thu, 15 Apr 2010 09:52:00 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O2PSl-0005YQ-Cz for rs_out_1@blacksheep.org; Thu, 15 Apr 2010 14:50:35 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O2PSk-0005YH-Uw for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 14:50:34 +0100 Received: from out1.ip08ir2.opaltelecom.net ([62.24.128.244]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O2PSh-0002GT-Lr for rsgb_lf_group@blacksheep.org; Thu, 15 Apr 2010 14:50:34 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvYFACy2xktOkz4b/2dsb2JhbACBPo42hVSGJnG+aYUOBA X-IronPort-AV: E=Sophos;i="4.52,212,1270422000"; d="scan'208,217";a="445694068" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.62.27]) by out1.ip08ir2.opaltelecom.net with SMTP; 15 Apr 2010 14:49:45 +0100 Message-ID: <002901cadca2$7e86b310$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <4D95FB39404AA04CA998E7F63B1A2E5F0432C756@esealmw110.eemea.ericsson.se> Date: Thu, 15 Apr 2010 14:49:39 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Amplifier required for LF DX/weak signals? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01CADCAA.E01DC980" 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: 3039ac1d40854bc71a004c15 X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0026_01CADCAA.E01DC980 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable daniele =20 I use large loops and inv L antennas and do not need any preamps, howe= ver the RX needs to be sensitive and suitable for purpose. With small loops and poor RX sensitivity a preamp is probably necessar= y. de mal/g3kev ----- Original Message -----=20 From: Daniele Tincani=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, April 15, 2010 2:26 PM Subject: LF: Amplifier required for LF DX/weak signals? 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 op= inion is that a bigger non-amplified loop is better than a smaller amp= lified 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 ND= B 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 involve= d? =20 Best regards Daniele =20 ------=_NextPart_000_0026_01CADCAA.E01DC980 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
daniele   
I use large loops and inv L antennas= and do not=20 need any preamps, however the RX needs to be sensitive and suitable fo= r=20 purpose.
With small loops and poor RX sensitiv= ity a preamp=20 is probably necessary.
de mal/g3kev
 
----- Original Message -----
From:=20 Daniele Tincani
Sent: Thursday, April 15, 201= 0 2:26=20 PM
Subject: LF: Amplifier requir= ed for LF=20 DX/weak signals?

Hi=20 LF,

 

Quite a general question: is a=20 pre-amplifier needed in your opinion for listening to LF weak signal= s (e.g.=20 NDB DX, etc.)?

I read different opinions in very= =20 famous articles on the Web: one opinion is that a bigger non-amplifi= ed loop is=20 better than a smaller amplified loop and an amplifier should be used= only if=20 really necessary (and only with the strictly required gain). On the= contrary,=20 another famous article says that an antenna pre-amplifier is importa= nt for NDB=20 DX, despite it mentions quite a big loop as the antenna. I=92m just= a beginner=20 in LF and NDB listening with quite a simple system. I tried an homeb= rew=20 amplifier together with my small loop and it seemed to me that it di= d not add=20 anything but loudness to both the signal and the noise. Basically,= no=20 improvements in signal readability. What=92s your opinion, in partic= ular when=20 cheap portables (e.g. DE1103) are involved?=

 

Best=20 regards

Daniele<= /P>

 

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