Return-Path: Received: from rly-dc07.mx.aol.com (rly-dc07.mail.aol.com [172.19.136.36]) by air-dc07.mail.aol.com (v126.13) with ESMTP id MAILINDC071-b314b179e3039f; Thu, 03 Dec 2009 06:17:11 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc07.mx.aol.com (v125.7) with ESMTP id MAILRELAYINDC075-b314b179e3039f; Thu, 03 Dec 2009 06:17:05 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NG9fH-0001IZ-Qq for rs_out_1@blacksheep.org; Thu, 03 Dec 2009 11:16:03 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NG9fG-0001IQ-MC for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2009 11:16:02 +0000 Received: from cmsout02.mbox.net ([165.212.64.32]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NG9fE-00040K-KP for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2009 11:16:02 +0000 Received: from cmsout02.mbox.net (co02-lo [127.0.0.1]) by cmsout02.mbox.net (Postfix) with ESMTP id 6B789134580 for ; Thu, 3 Dec 2009 11:15:54 +0000 (GMT) Received: from cmsapps02.cms.usa.net [165.212.11.138] by cmsout02.mbox.net via smtad (C8.MAIN.3.58V) with ESMTP id XID444NLcLP34457X02; Thu, 03 Dec 2009 11:15:54 -0000 X-USANET-Source: 165.212.11.138 IN dibene@usa.net cmsapps02.cms.usa.net X-USANET-MsgId: XID444NLcLP34457X02 Received: from [192.168.1.5] [151.47.217.200] by cmsapps02.cms.usa.net (ESMTPA/dibene@usa.net) via mtad (C8.MAIN.3.53P) with ESMTPA id 377NLcLP16672M38; Thu, 03 Dec 2009 11:15:52 -0000 X-USANET-Auth: 151.47.217.200 AUTH dibene@usa.net [192.168.1.5] Message-ID: <4B179DE6.3050608@usa.net> Date: Thu, 03 Dec 2009 12:15:50 +0100 From: Alberto di Bene User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <38A51B74B884D74083D7950AD0DD85E828AAF4@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B16987B.9000002@usa.net> In-Reply-To: X-Enigmail-Version: 0.96.0 Z-USANET-MsgId: XID377NLcLP26672X38 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Results of optimising an active antenna Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=0.0 required=5.0 tests=none 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-Mailer: Unknown (No Version) Roelof Bakker wrote: > Hello Alberto, > > I have used a large coffee tin (30 cm high and 27 cm diameter), for a > passive electric field probe. > The capacitance was way to high for active circuitry. Instead a rf > transformer wound on a hefty high mu toroid was used to couple the antenna > to the coaxial feedline. It worked, though the bandwidth was restricted to > LF and MF. > > An other example is using a small diecast alluminium box (50 x 50 x 30 mm) > with the buffer amplifier mounted inside. Hello Roelof, thanks for the info. Well, 30 x 27 cm was rather a big coffee tin... Who knows, may be a small beer can, those of 33cl, has the right capacity towards ground... must do an experiment. Suggestions about the brand of the beer are gladly accepted... :-) 73 Alberto I2PHD