Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u3TBgGBk003785 for ; Fri, 29 Apr 2016 13:42:16 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aw6kz-0000Dd-Td for rs_out_1@blacksheep.org; Fri, 29 Apr 2016 12:38:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aw6kz-0000DT-Ju for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 12:38:49 +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 4.87) (envelope-from ) id 1aw6kx-0004JS-Gp for rsgb_lf_group@blacksheep.org; Fri, 29 Apr 2016 12:38:48 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 5E5FE20BD8 for ; Fri, 29 Apr 2016 13:38:46 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3qxBY219zXz5vNC for ; Fri, 29 Apr 2016 13:38:46 +0200 (CEST) Message-ID: <572347C6.10607@posteo.de> Date: Fri, 29 Apr 2016 13:38:46 +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: <579355A36AEE9D4FA555C45D556003AB53B7946D@servigilant.vigilant.local> In-Reply-To: <579355A36AEE9D4FA555C45D556003AB53B7946D@servigilant.vigilant.local> X-Scan-Signature: 118b9e608370528226a3c3b3aedcdda0 Subject: Re: LF: Paint buckets as coil forms Content-Type: multipart/alternative; boundary="------------090109030006010402090205" 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 X-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7919 This is a multi-part message in MIME format. --------------090109030006010402090205 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Am 29.04.2016 13:09, schrieb VIGILANT Luis Fernández: > For multilayer I was thinking about the Pyramidal Wound technique > described at Rik page http://www.strobbe.eu/on7yd/136ant/#CoilLosses > Looks complex to manage with a thin wire. I made a two layer coil with > 1.5mm2 wire using this technique and the thick of the wire helps a lot > to keep turns in place. Thinner wire may be doable with much more > layers ..... may be ? I do not recommend it. BTW, before starting to wind a coil it would be useful to know the target value :-) So you need to know the antenna C and thus you need to have an existing antenna. Do you already have your VLF antenna installed between the buildings / high houses? What is the C? Ah and btw it is worth to use a wire which has at least 1 mm diameter, better is 2 mm because of HV partial discharges (audible and visible and lossy and unstable-phase)! If you have access to the high houses, you could even use 10 or 20 wires in parallel, spaced 0.5m or so. That would be ideal and the C would be high, voltages low and L low! 73, Stefan --------------090109030006010402090205 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Am 29.04.2016 13:09, schrieb VIGILANT Luis Fernández:
 
For multilayer I was thinking about the Pyramidal Wound technique described at Rik page http://www.strobbe.eu/on7yd/136ant/#CoilLosses
Looks complex to manage with a thin wire. I made a two layer coil with 1.5mm2 wire using this technique and the thick of the wire helps a lot
to keep turns in place. Thinner wire may be doable with much more layers ..... may be ?

I do not recommend it.
BTW, before starting to wind a coil it would be useful to know the target value :-) So you need to know the antenna C and thus you need to have an existing antenna.
Do you already have your VLF antenna installed between the buildings / high houses?
What is the C?
Ah and btw it is worth to use a wire which has at least 1 mm diameter, better is 2 mm because of HV partial discharges (audible and visible and lossy and unstable-phase)!
If you have access to the high houses, you could even use 10 or 20 wires in parallel, spaced 0.5m or so. That would be ideal and the C would be high, voltages low and L low!

73, Stefan
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