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 w5SH0bMN012405 for ; Thu, 28 Jun 2018 19:00:40 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fYaCD-0000Mb-M4 for rs_out_1@blacksheep.org; Thu, 28 Jun 2018 17:55:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fYaC5-0000MQ-C9 for rsgb_lf_group@blacksheep.org; Thu, 28 Jun 2018 17:54:53 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fYaC3-0001B3-2N for rsgb_lf_group@blacksheep.org; Thu, 28 Jun 2018 17:54:51 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id C154520F94 for ; Thu, 28 Jun 2018 18:54:49 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1530204889; bh=Xv+JOE6Twy4+0JIZ2V3dLNReL5t6AFwXXxu30cd/t84=; h=Date:From:To:Subject:From; b=BmOE529qxTYBa8nhXXd+hs3xqidRODRQTG0Oy1DtChP3nNaXWIJfRs84pkobQqWl1 JTXHeylJtT0lg8hH7OcpqNAhKTy7qPSKfoh6kAr71Ls5nv7Wb7SjULPf2kiOAKBReu VLaz8PT9WnOFrqEA4kfV44WqnmI6/truLUZjY+1gmInRrR6JGBQMQX3opRgT4L4P2U /iSW3oOeJwYPsw1BxIHI9VzLYoahYnxLG1BNxMQRWoudy06dF58eBr2K8mC1lZ5AMh QLMCRV+YROFvG9jNnkWWY9nQ5TXwZaJJo8+DO716kCnJ05AJMnh96I7qMTZKhvTS6n lGBRN8nXvXGUw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 41Gm951508z9rxM for ; Thu, 28 Jun 2018 18:54:48 +0200 (CEST) Message-ID: <5B3512D8.7080006@posteo.de> Date: Thu, 28 Jun 2018 18:54:48 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <319563372.20180628161811@gmail.com> In-Reply-To: <319563372.20180628161811@gmail.com> X-Spam-Score: -2.3 (--) 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hi Chris, It will depend on your antenna size and the system Q. Just try and see what happens. On RX, mnothing should become damaged. With the coil switched to LF there could be enough signal on MF. As long as e.g. a ferrite transformer in the line is can handle LF, it will also handle MF. Just about a factor 3 in frequency. But you could use further components in the shack to get more signal on MF then, like a parallel L which pulls the residual resonance towards higher frequencies. Just some spontaneous thoughts. [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 0a4643e586472c13187d293ec5d096c2 Subject: Re: LF: Can I match 2 frequencies with one loading coil? 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 Hi Chris, It will depend on your antenna size and the system Q. Just try and see what happens. On RX, mnothing should become damaged. With the coil switched to LF there could be enough signal on MF. As long as e.g. a ferrite transformer in the line is can handle LF, it will also handle MF. Just about a factor 3 in frequency. But you could use further components in the shack to get more signal on MF then, like a parallel L which pulls the residual resonance towards higher frequencies. Just some spontaneous thoughts. 73, Stefan Am 28.06.2018 17:18, schrieb Chris Wilson: > > Hello LF'ers and MF'ers > > Can I, for RX only, use my single loading coil to match 2 receivers to > my single (LF at the moment) antenna , one on MF and one on LF? I > envisage 2 feedlines to the shack. How important is a 50 Ohm match on > the MF one? If I need a second matching transformer for MF what > toroidal core should I use? Thanks. 2E0ILY > > > >