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 vADLIsWU004654 for ; Mon, 13 Nov 2017 22:18:56 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eEM2i-0001lC-Js for rs_out_1@blacksheep.org; Mon, 13 Nov 2017 21:13:20 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eEM2b-0001l3-5e for rsgb_lf_group@blacksheep.org; Mon, 13 Nov 2017 21:13:13 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eEM2Y-0008Pr-Be for rsgb_lf_group@blacksheep.org; Mon, 13 Nov 2017 21:13:11 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 2546F20AF8 for ; Mon, 13 Nov 2017 22:13:08 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3ybNdt4cGBzyms for ; Mon, 13 Nov 2017 22:13:06 +0100 (CET) Message-ID: <5A0A0AE2.9040606@posteo.de> Date: Mon, 13 Nov 2017 22:13:06 +0100 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: <15f68ccfd03-c09-1dcf0@webjas-vaa134.srv.aolmail.net> <40168a26-8991-6998-e541-585a8575ad32@abelian.org> <59FCF49B.9050703@posteo.de> <5A06DAE4.9030301@posteo.de> <5A072F91.1050406@posteo.de> <5A083D50.2080105@posteo.de> <34e5e647-caf1-6184-9ab5-9d293486994f@abelian.org> <5A085F65.3060409@posteo.de> <5A0889B1.3020701@posteo.de> <5A09B458.1040700@posteo.de> <4d424ea7-6164-006b-0b5e-d8f205555a65@virginbroadband.com.au> In-Reply-To: <4d424ea7-6164-006b-0b5e-d8f205555a65@virginbroadband.com.au> 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: Hi Edgar, nice to read from you. I thought about you today and asked myselfe what could be your current situation regarding VLF reception (?) Am 13.11.2017 21:36, schrieb edgar: > Hi Stefan, > > Interesting, are you aiming for a high Q coil, Well, you can call it high Q but in the first way the aim is a high L that holds a high voltage. I need 56 H at that frequency, quite an effort for hand wound air gapped coil :-) With that load of material i can do many interesting experiments below 4 kHz... [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 1908b49407fc556987226b536cc4bad0 Subject: Re: ULF: A next step for 970 Hz Content-Type: multipart/alternative; boundary="------------010605020609040907000905" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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 This is a multi-part message in MIME format. --------------010605020609040907000905 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Edgar, nice to read from you. I thought about you today and asked myselfe what could be your current situation regarding VLF reception (?) Am 13.11.2017 21:36, schrieb edgar: > Hi Stefan, > > Interesting, are you aiming for a high Q coil, Well, you can call it high Q but in the first way the aim is a high L that holds a high voltage. I need 56 H at that frequency, quite an effort for hand wound air gapped coil :-) With that load of material i can do many interesting experiments below 4 kHz... > If so what is the best geometry for the coil for that frequency? So far i took a mofied mains transformer which has a 1 mm air gap and 0.5 mm plates. At 5 kV / 15 mA antenna current it became quite warm already. To make the next distance step i need 10 dB QRO or so. In the end i should reach at least 30 kV, then i think Paul and DL0AO will be able to receive me. No, no calculations! 73, Stefan > > Regards, Edgar > Moonah, Tasmania. > > --------------010605020609040907000905 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Edgar,

nice to read from you.
I thought about you today and asked myselfe what could be your current situation regarding VLF reception (?)

Am 13.11.2017 21:36, schrieb edgar:
Hi Stefan,

Interesting, are you aiming for a high Q coil,
Well, you can call it high Q but in the first way the aim is a high L that holds a high voltage. I need 56 H at that frequency, quite an effort for hand wound air gapped coil :-)
With that load of material i can do many interesting experiments below 4 kHz...


If so what is the best geometry for the coil for that frequency?
So far i took a mofied mains transformer which has a 1 mm air gap and 0.5 mm plates. At 5 kV / 15 mA antenna current it became quite warm already. To make the next distance step i need 10 dB QRO or so. In the end i should reach at least 30 kV, then i think Paul and DL0AO will be able to receive me. No, no calculations!

73, Stefan


Regards, Edgar
Moonah, Tasmania.
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