Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w3GLQkb2024343 for ; Mon, 16 Apr 2018 23:26:47 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1f8BZ9-0003ob-Mi for rs_out_1@blacksheep.org; Mon, 16 Apr 2018 22:21:35 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1f8BZ1-0003oS-3x for rsgb_lf_group@blacksheep.org; Mon, 16 Apr 2018 22:21:27 +0100 Received: from elasmtp-masked.atl.sa.earthlink.net ([209.86.89.68]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1f8BYx-0003MI-UI for rsgb_lf_group@blacksheep.org; Mon, 16 Apr 2018 22:21:25 +0100 X-DKIM-Result: Domain=earthlink.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=earthlink.net; s=dk12062016; t=1523913683; bh=Fd4uFH6iBKhxcABkIM2P9yjVQ3/ZaSmJPxMe qEY7obM=; h=Received:Received:Date:From:Reply-To:To:Message-ID: Subject:MIME-Version:Content-Type:Content-Transfer-Encoding: X-Mailer:X-ELNK-Trace:X-Originating-IP; b=dA0AxF1rq9e8uL8c1cif/8ST 4zMfz/0JkegX2fMowo4mPTd/AmZ8DiOafdv7rRY2PuBlua5OYXmu496P7BiiaWiA0oZ nEpA+ZsCfgJX+QHJoWtMt6T0e77XJm7CVrwbRQwIZ2/9pmBphhF1P1cfbQo7OzQ2V80 w9KYoD6cNuG+SYZUlSCuLw9ujkSsx3yfG+d60aS5HrG5yH22xcU7N3W3xkrboX28YGW ME20BJm0tS/LuWMYj+lzk4BnHRcX2sNOE/6+4V2M75HSVOuYzYtubnd+jsnHahZ1+My fBvKwsOc2rnApMjyFbAs6eBCOzR9E61h+tnAVJbbwQxoKRsSKQ== DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk12062016; d=earthlink.net; b=T0tKLTFH+1gzyh0bPSzBZfEM5Dqu5SuuuBnEiCK9ImveY8BHsPYIsCnb6vFNpt8hCM65Jj3LENuTAmya5Ttrl19ahOOGlgEp+lMyUGpxshEKBbEhZ/DfgWHTHylqTjYgNmuc4rv+NCBh/9VvNXCQh+IkmJJ4L/3v4hpL2Z55erK9IJGAooU0XBmn4cDIHn7HfazN7WpQpMDI9+pkNU5gF7EDKlmlQuef/r/n10D6fvZ/IFBHUAjkyUsabjQwDqmEzUME8bJS6BD2MTlEWbANu+WX3yEV4rj5ZOOn+VMRoTC6tLqBFYWE9ko+Urul4RXmjd6GSyT3wLPa2I1rCNa++g==; h=Date:From:Reply-To:To:Message-ID:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [209.86.224.176] (helo=wamui-kristoff.atl.sa.earthlink.net) by elasmtp-masked.atl.sa.earthlink.net with esmtpa (Exim 4) (envelope-from ) id 1f8BYj-00070U-Mw for rsgb_lf_group@blacksheep.org; Mon, 16 Apr 2018 17:21:09 -0400 Received: from 205.232.250.147 by webmail.earthlink.net with HTTP; Mon, 16 Apr 2018 17:21:09 -0400 Date: Mon, 16 Apr 2018 17:21:09 -0400 (EDT) From: Chris Trask To: rsgb_lf_group@blacksheep.org Message-ID: <1176060591.11234.1523913669691@wamui-kristoff.atl.sa.earthlink.net> MIME-Version: 1.0 X-Mailer: EarthLink Zoo Mail 1.0 X-ELNK-Trace: b77fdb70683249914713efb067f9a722239a348a220c2609df06bf0976423a56296b035e5821ee0c666fa475841a1c7a350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 209.86.224.176 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: That's an intersting and simple design. I have only found a few specs for that 1NA217 device, but even those are impressive in terms of THD and input noise voltage. Since it is good up to 800 kHz it's well suited for LF and below. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 925300287489a1d7272e62b121c112aa Subject: Re: LF: Active loop antennas Content-Type: text/plain; charset=UTF-8 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 That's an intersting and simple design. I have only found a few specs for that 1NA217 device, but even those are impressive in terms of THD and input noise voltage. Since it is good up to 800 kHz it's well suited for LF and below. > >I'm running this pre-amplifier attached to a single turn loop, an >equilateral triangle with 10 metres of circumference (~13 uH). C1 (150nF >here) is needed to block "KIL" (NDB, 353 kHz) at 800m of distance. > Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/