Return-Path: Received: (qmail 29748 invoked from network); 24 Aug 2002 06:50:10 -0000 Content-Transfer-Encoding: 8bit Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 24 Aug 2002 06:50:10 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 6156 invoked from network); 24 Aug 2002 06:50:26 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 24 Aug 2002 06:50:26 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17iWQb-0006jo-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 24 Aug 2002 09:37:53 +0100 Received: from astral.infomsk.ru ([212.164.44.2] helo=astral.omskcity.com) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17iWQZ-0006jj-00 for rsgb_lf_group@blacksheep.org; Sat, 24 Aug 2002 09:37:52 +0100 Received: from fitec.omskcity.com (mu04.dialup2.infomsk.ru [212.164.44.116]) by astral.omskcity.com (8.9.3/8.9.3) with SMTP id NAA3d672af3733f for ; Sat, 24 Aug 2002 13:42:59 +0700 (OSS) Date: Sat, 24 Aug 2002 14:23:38 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org Subject: Re: LF: E-field probe antenna versus receiving loop. In-reply-to: <001e01c1e13e$8413da00$4f6152d5@it> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi, Giulio. On Thu, 11 Apr 2002, Giulio Scaroni wrote: > Has someone tried the E-field probe vertical whip with high impedance fet preamplifier, comparing it to a classic multiwire receiving loop, here in 136 Khz? > I would like to made an E-field probe for use here at home when in summer season the LF transmitting vertical in down, and i dont want to put another loop on the roof ( i have now a magloop 4 meters dia for low band, and a little one only 1 meters dia for 40 to 12 meters band hi hi). > > Thankyou and 73 de > IK2DED Giulio Scaroni > I have not do experiment with fet preamp. but I did some experiment with GP for 14 Mhz. It work quiet good but only (!!!) if I use a ferrite transformer to avoid noise transfer from grounded RX case to RX input. When I used RX powered from galvanic elements transformer is not need. But if there is no transformer when ground is connected to RX case noise is dramaticaly increased and all the signals are disapear. It seems because bad grounding coupled with power lines which carry lot of noise. My GP is on the roof of 5 flore building. 73 de RA9MB/Alex http://www.qsl.net/ra9mb