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 w067jnmT012349 for ; Sat, 6 Jan 2018 08:45:50 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eXizW-00032W-Ta for rs_out_1@blacksheep.org; Sat, 06 Jan 2018 07:34:06 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eXizP-00032N-6o for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 07:33:59 +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 1eXizK-0000rD-Va for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 07:33:57 +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=J9/e0t1mbznwcya7v2n4sRA+4T+W9Z7E6Es43ZsaHLI=; b=fLtYsMdcYAtSaxMfZP7TFOstoA Wb+TsFgWO5zPsZH1CJJTSS29yFtb3IG6JJ0tTejSEXUwv0rc0BYhLWqldFbFt/d1COy8zLdLLCTwn cpsFvKDeUI/qjVmud/dlnsb0fQuts6L6VlT5IUDhd3VIOY5GOu2/0vWCviBPvEZ/rYp4=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:48392 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1eXizI-0006Xp-SR for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 07:33:52 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 790594005A8 for ; Sat, 6 Jan 2018 07:33:51 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <44f8501d-9d57-2793-b33e-ee4a2e80d6a4@abelian.org> <702563436.93043973.1515019639560.JavaMail.zimbra@shaw.ca> <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> <1944603203.95803107.1515098735558.JavaMail.zimbra@shaw.ca> From: Paul Nicholson Message-ID: Date: Sat, 6 Jan 2018 07:33:51 +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: <1944603203.95803107.1515098735558.JavaMail.zimbra@shaw.ca> 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: Receivers will be off at various times today to install that power supply upgrade and replace some random cabling with something a bit more robust. http://abelian.org/vlf/tmp/180106a.jpg The box on the left terminates the cat5 cables coming in from the E and H rx sites. It's a junction box with isolating transformers and on/off switches for each rx. It has three balanced VLF outputs and a three-channel 137kHz output. [...] 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: 290c8768709872f914a4ca71ad6bfe49 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 Receivers will be off at various times today to install that power supply upgrade and replace some random cabling with something a bit more robust. http://abelian.org/vlf/tmp/180106a.jpg The box on the left terminates the cat5 cables coming in from the E and H rx sites. It's a junction box with isolating transformers and on/off switches for each rx. It has three balanced VLF outputs and a three-channel 137kHz output. The other box is a dual 55V PSU. Nominally 48V but adjusted up to the max. I didn't want to have both rx share the same supply, hence two of everything. Decided to use a bit of extra ripple smoothing and RF filtering to make the DC bus really clean. Each rx will have to come in for replacement DC-DC converter. Then everything needs recalibrating which takes only about 2 hours now for both rx. I just hope the weather holds good. All my radio equipment and the computers that go with it, lives outside the house in a small shed. One plug isolates the shed during thunderstorms. As well as protecting the house from fires and lightning, it seems much easier to manage and limit noise and interference that way and there is much less cabling. Jack wrote: > But when you get to be 75 years old ones ability to absorb > technical complex issues gets more problematic ;-) I hope not - I'm catching you up fast. Only yesterday I was in my 30s, and a couple of days before that, my 20s! No, I don't believe that Jack. I think that when you're older it seems to take longer, perhaps because you go into things in more depth with more understanding. The youngsters just learn which buttons to push. Andy reminds us that there are other ways to receive coherent signals... my knowledge is limited to sound cards and PC software. I envy those that can build things out of PICs and DSP chips. -- Paul Nicholson --