Return-Path: Received: (qmail 20624 invoked from network); 27 Apr 2001 18:28:07 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 27 Apr 2001 18:28:07 -0000 Received: (qmail 26726 invoked from network); 27 Apr 2001 18:27:54 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 27 Apr 2001 18:27:54 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14tCs9-0003Ru-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 27 Apr 2001 19:21:41 +0100 Received: from amersham.mail.uk.easynet.net ([195.40.1.45]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14tCs5-0003Ro-00 for rsgb_lf_group@blacksheep.org; Fri, 27 Apr 2001 19:21:37 +0100 Received: from ericadodd (tnt-1-167.easynet.co.uk [195.40.206.167]) by amersham.mail.uk.easynet.net (Postfix) with SMTP id 782331805C for ; Fri, 27 Apr 2001 19:20:25 +0100 (BST) Message-ID: <000601c0cf47$124ae620$a7ce28c3@ericadodd> From: "g3ldo" To: rsgb_lf_group@blacksheep.org References: <001c01c0cee7$3843ab60$ba62883e@g3aqc> Subject: LF: Re: Re. Pre-amps Date: Fri, 27 Apr 2001 13:00:33 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >Many thanks to everone who responded to my comments on pre-amps and loops.I >am still not certain what to do-but at least have some more ideas. I hope that the >resulting discussion was of general intrest. 73s Laurie. Hi Laurie, I have made a number of LF loops and have not had much luck with pre-amps; they all seemed a bit noisy or I found there were lots of signals around that shouldn't be there. I found the best loop is the 2m square one that is described on my web site, wound with Litz wire and without an amplifier. I confirm that the loop characteristics are very much modified by the nearby resonant LF transmitting antenna and the fix is to detune the Tx antenna on receive. It is also a good idea to detune the receive loop on transmit! Regards, Peter, G3LDO e-mail Web