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 vBABlpX0020845 for ; Sun, 10 Dec 2017 12:47:52 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eNzzj-0003vf-Hi for rs_out_1@blacksheep.org; Sun, 10 Dec 2017 11:42:07 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eNzzi-0003vW-T9 for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 11:42:06 +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 1eNzzf-0007C7-OJ for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 11:42:05 +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=69LfRJEBL1mZfkYGAMWoYkTp4joAtdJlVDSpJHZbwiU=; b=TYCOEGXEDl39WfvJ7XLqmu7DRD 5sLed1qteyWlO1gH4facGZWnxUYNc28F9DzpFV5aWJp4s6g6tD9y0QXmywnnk6iRowhre+HtrmrA4 kVTDV1+nx385y3nfwO9OdmOQxpW+/giofdK6ceHKsE5Tg4I75a4sRYyI1B+HS6e+ipaw=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:58781 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 1eNzzf-0004Qp-7N for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 11:42:03 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id A7507400068 for ; Sun, 10 Dec 2017 11:42:02 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <00f901d36646$feda4e60$fc8eeb20$@comcast.net> <085dd850-9c10-16a0-70ef-fb2de079ffb8@abelian.org> <023201d367cf$8a5761b0$9f062510$@comcast.net> <579355A36AEE9D4FA555C45D556003AB9AAAF572@servigilant.vigilant.local> <2166618d-7238-0516-367c-2f917532eed2@abelian.org> <5A20A4EC.4060009@posteo.de> <5A2694B9.4050407@posteo.de> From: Paul Nicholson Message-ID: <21caec0e-1514-3294-89a3-8569f0c6d443@abelian.org> Date: Sun, 10 Dec 2017 11:42:02 +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: <5A2694B9.4050407@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: Ground to a halt this weekend on the new H rx, waiting for parts. There's always something that's out of stock! http://abelian.org/vlf/tmp/171210a.jpg I decided I could fit both pre-amp and line driver into the same box. I couldn't see any noticeable feedback or coupling between in and out transformers on the breadboard. [...] 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: 66d07794ca19cd68f7d6cc289cd4ac18 Subject: Re: LF: RE: Todmorden receiver 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 Ground to a halt this weekend on the new H rx, waiting for parts. There's always something that's out of stock! http://abelian.org/vlf/tmp/171210a.jpg I decided I could fit both pre-amp and line driver into the same box. I couldn't see any noticeable feedback or coupling between in and out transformers on the breadboard. Stefan wrote: > what is the 'gain' on 2970 Hz relative to the old system from > the last season? Hard to say, because I couldn't determine the cause of the low S/N (compared to E-field) at 2970 and 5170. My guess is intermod and if so the new rx should be a few dB better! Meanwhile I spent a bit of time on the new spectrogram - it can be tried out at http://abelian.org/vlf/fbins3.html eg some recent T/A signals http://abelian.org/vlf/fbins3.html#p=1512392400&b=280&s=sp&m=fb&c=1 and it needs a standards-compliant browser which rules out most versions of Internet Explorer, except maybe v10. The difference with this one is that it downloads raw spectrum data to the browser and all the arithmetic is done in JavaScript within the browser. This makes it much more interactive, and quicker too, although the spectrum data is downloading in ASCII at the moment. It'll double speed when I switch it to binary. It also means you can rip off the code and use it for your own on-line spectrograms. You just need to supply the spectrum data from your web server, which is about a 30 line shell script running vlfrx-tools. My plan is to make it multi-band, easy - just change the URL that it pulls spectrum data from. -- Paul Nicholson --