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 vANMgkiw008042 for ; Thu, 23 Nov 2017 23:42:49 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eI07P-0004MS-O6 for rs_out_1@blacksheep.org; Thu, 23 Nov 2017 22:37:15 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eI07P-0004MJ-Bx for rsgb_lf_group@blacksheep.org; Thu, 23 Nov 2017 22:37:15 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eI07M-0008QC-Mo for rsgb_lf_group@blacksheep.org; Thu, 23 Nov 2017 22:37:14 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=6dM2lhZ0dMRzBwIwdkopHYvW6s6wKQ81zQfAYRVJZ3o=; b=AsSX3Pr19UjNxntnBzQo64duld XhaxYZdyBFzfQK6a8PiQQk53SBPVebUQzYza75gIVvDYdxdxiPqB/09ClhGNH7+0IX8BFyzfK42Z5 jIDIdRF5eMiuWXRAg3lH1T+A14F/Qt+IYauuF9ATm2J15Ej8ILLmPxmn2CrJxx90G1e8=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:48008 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eI07M-0003Kq-Bn for rsgb_lf_group@blacksheep.org; Thu, 23 Nov 2017 22:37:12 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id C41B14004BA for ; Thu, 23 Nov 2017 22:37:11 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <1511435423211.30693.733ee8c331c73a5d9fb3f4de7605254d5ecd6627@spica.telekom.de> <5A1745D3.7030408@posteo.de> From: Paul Nicholson Message-ID: <3bdc9db6-ed39-d991-0298-746f1e9fbb86@abelian.org> Date: Thu, 23 Nov 2017 22:37:11 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <5A1745D3.7030408@posteo.de> Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org 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: I don't have much room in here so it's always a cluttered mess. Projects literally pile up on top of each other. Rummaging down through the layers is like an archeological dig. Somewhere down there are the remains of the LF tx I was using a year ago. [...] 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: e90dcb17768c7e768f13e0721cc1c0c7 Subject: Re: VLF: Unfamiliar carrier on 8270.007 Content-Type: text/plain; charset=utf-8; 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 I don't have much room in here so it's always a cluttered mess. Projects literally pile up on top of each other. Rummaging down through the layers is like an archeological dig. Somewhere down there are the remains of the LF tx I was using a year ago. Oh, on the topic of LF - I've got a bag of MC1496 mixers I'm thinking of using for a 137 kHz rx. I've always had good results with the MC1496, it seems easy to work with. But it's a quite venerable device now, should I be looking at some more modern mixer chip that works better? The E-field rx performs at 137 kHz, not sure about the system noise yet but it ought to be around 30nV in 1Hz. Wonder how that compares with the natural noise floor? I hope to take a feed off the VLF rxes into an LF mixer for some coherent reception. It'll make good use of one of the GPSDOCXOs that are taking up bench space... -- Paul Nicholson --