Envelope-to: dave@picks.force9.co.uk Delivery-date: Thu, 19 Jan 2006 23:51:45 +0000 Received: by ptb-mxcore02.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1EzjZ9-0004hk-DI for dave@picks.force9.co.uk; Thu, 19 Jan 2006 23:51:45 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (PlusNet MXCore v2.00) id 1EzjZ9-0004cw-84 for dave@picks.force9.co.uk; Thu, 19 Jan 2006 23:51:43 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1EzjY1-0006as-Bd for rs_out_1@blacksheep.org; Thu, 19 Jan 2006 23:50:33 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1EzjY0-0006aj-Vq for rsgb_lf_group@blacksheep.org; Thu, 19 Jan 2006 23:50:32 +0000 Received: from cmsout01.mbox.net ([165.212.64.31]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1Ezkmp-0006Cy-U6 for rsgb_lf_group@blacksheep.org; Fri, 20 Jan 2006 01:10:16 +0000 Received: from cmsout01.mbox.net (cmsout01.mbox.net [165.212.64.31]) by cmsout01.mbox.net (Postfix) with ESMTP id 07C6278120 for ; Thu, 19 Jan 2006 23:49:34 +0000 (GMT) Received: from cmsapps01.cms.usa.net [165.212.11.136] by cmsout01.mbox.net via smtad (C8.MAIN.3.27I); Thu, 19 Jan 2006 23:49:34 GMT X-USANET-Source: 165.212.11.136 IN dibene@usa.net cmsapps01.cms.usa.net X-USANET-MsgId: XID362kasXxj2043X01 Received: from [192.168.0.6] [151.46.164.217] by cmsapps01.cms.usa.net (ASMTP/dibene@usa.net) via mtad (C8.MAIN.3.27E) with ESMTP id 141kasXxh0490M36; Thu, 19 Jan 2006 23:49:33 GMT X-USANET-Auth: 151.46.164.217 AUTH dibene@usa.net [192.168.0.6] Message-ID: <43D0258B.2000601@usa.net> Date: Fri, 20 Jan 2006 00:49:31 +0100 From: Alberto di Bene User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <016101c61d02$12ceca40$2101a8c0@pcroelof> <43CFCE5D.5000504@usa.net> <20060119232216.u1kyilxv57r4scgg@webmail.versatel.de> In-Reply-To: <20060119232216.u1kyilxv57r4scgg@webmail.versatel.de> X-Enigmail-Version: 0.94.0.0 Z-USANET-MsgId: XID141kasXxI0490X36 Subject: LF: Re: Mini Whip and local noise Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) uwe-jannsen@versanet.de wrote: > > Hi Alberto, > do you have a description of the Amrad E-field probe? > I cant find it on the net. > Regards > Uwe/dj8wx Hi Uwe, probably you haven't found it because it is referred to as "Amrad active antenna". Here is the PDF file describing it : http://www.arrl.org/tis/info/pdf/0109031.pdf and here you can find some notes by Amrad on it : http://www.pacificsites.com/~brooke/LF-Ant.shtml It uses a rather unusual power FET as active device, the Crystalonics CP666. A few have built it using a couple of U310 in parallel, at the maximum drain current compatible with the max dissipation, and with the supply voltage reduced from 24 to 12V. If the Roelof's mini whip antenna performs similarly, then there isn't the need of searching for the (expensive) CP666 FET. 73 Alberto I2PHD