Return-Path: Received: from rly-df02.mx.aol.com (rly-df02.mail.aol.com [172.19.156.15]) by air-df05.mail.aol.com (v121_r2.12) with ESMTP id MAILINDF053-53548c8f2e3345; Thu, 11 Sep 2008 06:29:07 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df02.mx.aol.com (v121_r2.11) with ESMTP id MAILRELAYINDF028-53548c8f2e3345; Thu, 11 Sep 2008 06:28:53 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1KdjPE-0002wO-TJ for rs_out_1@blacksheep.org; Thu, 11 Sep 2008 11:28:08 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1KdjPE-0002wF-0B for rsgb_lf_group@blacksheep.org; Thu, 11 Sep 2008 11:28:08 +0100 Received: from qmta04.westchester.pa.mail.comcast.net ([76.96.62.40]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1KdjP9-0006Hh-Bp for rsgb_lf_group@blacksheep.org; Thu, 11 Sep 2008 11:28:07 +0100 Received: from OMTA04.westchester.pa.mail.comcast.net ([76.96.62.35]) by QMTA04.westchester.pa.mail.comcast.net with comcast id DNPp1a00A0ldTLk54NTwlq; Thu, 11 Sep 2008 10:27:56 +0000 Received: from JAYDELL ([65.96.107.144]) by OMTA04.westchester.pa.mail.comcast.net with comcast id DNTw1a00936xPMd3QNTw9R; Thu, 11 Sep 2008 10:27:56 +0000 X-Authority-Analysis: v=1.0 c=1 a=2xLtXul8AT0Hwt5vGskA:9 a=71VYuBZ9Yk1SA3VAtZiYfhRAc1MA:4 a=rBKJJ2Jc0C4A:10 a=wk6s2zzMB60A:10 a=6BEIpMDiMxIA:10 Message-ID: <001001c913f9$0e86f5c0$8d01a8c0@JAYDELL> From: To: References: <48C89A4D.5020008@telus.net> Date: Thu, 11 Sep 2008 06:27:56 -0400 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=disabled,MAILTO_TO_SPAM_ADDR=0.276,NO_REAL_NAME=0.55 Subject: LF: Re: AC Noise on RX... Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.3 required=5.0 tests=MAILTO_TO_SPAM_ADDR, 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 X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: domain : post.thorcom.com ; SPF_helo = n X-AOL-SCOLL-AUTHENTICATION: domain : comcast.net ; SPF_822_from = ? Scott Welcome back! Agree with previous comments on checking the power supply first. What frequency range is affected? Is the isolation transformer an ac mains isolation transformer or an rf isolation transformer? Even if you're using an ac mains isolation transformer an rf isolation transformer on the lead will probably be required. For this transformer I've found that a conventional wound ferrite transformer with the primary and secondary separated on the core work best. Bifilar wound transformers are not the way to go here. If you have a computer connected to your receiver a 600 - 600 ohm isolation transformer in that connection can also improve noise pickup. Any hope of transmitting again? Jay W1VD WD2XNS WE2XGR ----- Original Message ----- From: "Scott Tilley" To: Sent: Thursday, September 11, 2008 12:10 AM Subject: LF: AC Noise on RX... > Hi All > > Been awhile since I've posted to the reflector. I'm pleased to announce I > have escaped the noisy clutches of the City and bought myself a nice piece > of land up the coast in a very quiet spot. > > Presently I'm only using my passive RX loop which has a single turn > 'sense' loop for coupling into the main multi turn loop... When the RX is > connected to an AC power power supply I get terrible AC growlers; however, > put the RX on a battery and bang not a peep of nasty AC noise. > > I presume this is due to some coupling between the AC mains and the RX > system and my isolation transformer doesn't seem to help so I wonder if > someone could set me straight on what is going on here so I can solve the > problem. > > Thanks for any support! > > 73 Scott > VE7TIL >