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[195.171.43.25]) by mx.google.com with ESMTP id hk4si1966896wib.81.2013.10.25.15.15.40 for ; Fri, 25 Oct 2013 15:15:40 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1VZoKR-0007C9-5D for rs_out_1@blacksheep.org; Fri, 25 Oct 2013 21:49:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1VZoKQ-0007C0-It for rsgb_lf_group@blacksheep.org; Fri, 25 Oct 2013 21:49:54 +0100 Received: from mail-oa0-f43.google.com ([209.85.219.43]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1VZoKO-0000iC-O9 for rsgb_lf_group@blacksheep.org; Fri, 25 Oct 2013 21:49:53 +0100 Received: by mail-oa0-f43.google.com with SMTP id m1so1477824oag.16 for ; Fri, 25 Oct 2013 13:49:50 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=ukyHiQMDMDk4xPxdw8zzStpSbdKMly3m+w+wWB+pTjk=; b=hgAv0FtvLBZfLGUXhsQsjDI6FAaVRXpVZa5+UDr9gQ6ztLvqEuhVeKTQ0l6srA53DP ZXwVpZJEZlbgEvqpxnVaJddJGKEnxNFaqLzcbSmkIJCWddA8HiPXX1KrVpX4zwBWAzSc TtHxcjdxDEC3mAxl/ucEqyP1PqswQAUmnykrvYJhSGnx8vvEvmQ2EcW76laqxrL5Jv8z 32NJMxkvTiMoqJnQHQzBSKBZu8UL1m2OgWod+7yMFrHTr+FNb3vrjjSQZS+AVUzkQEdj EKq+3buh2KHXVfrfE0fYV5voki49y9UNGYtH+mdNcMFK/uVglCLexKRqVggFYePFC6ka XS4g== MIME-Version: 1.0 X-Received: by 10.182.48.130 with SMTP id l2mr4643225obn.44.1382734190172; Fri, 25 Oct 2013 13:49:50 -0700 (PDT) Received: by 10.60.55.129 with HTTP; Fri, 25 Oct 2013 13:49:50 -0700 (PDT) In-Reply-To: <526AD2A4.9060704@t-online.de> References: <526ACC49.6030208@t-online.de> <29208E66335B49E08158AB7E38F57C7C@AGB> <526AD2A4.9060704@t-online.de> Date: Fri, 25 Oct 2013 16:49:50 -0400 Message-ID: From: Warren Ziegler To: rsgb_lf_group X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Christoph, A while back someone on the US longwave reflector posted the result of an experiment. They took a receiver to the site of a high power Tesla coil operating at LF, I believe it was being driven at 175kHz. they expected to hear it at some distance but were surprised to find out they could only hear the Tesla coil at very short distances. It seems that a coil by itself is an extremely poor radiator at LF! It is unknown to me if there was any earth connection to the Tesla coil, perhaps only through the mains connection. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.219.43 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (wd2xgj[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 7c7a1907d3a7d57b28660e5fb4c32107 Subject: Re: LF: air solenoids Content-Type: multipart/alternative; boundary=089e0160b3dc3963b804e996e4bc X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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 Status: O X-Status: X-Keywords: X-UID: 3369 --089e0160b3dc3963b804e996e4bc Content-Type: text/plain; charset=ISO-8859-1 Christoph, A while back someone on the US longwave reflector posted the result of an experiment. They took a receiver to the site of a high power Tesla coil operating at LF, I believe it was being driven at 175kHz. they expected to hear it at some distance but were surprised to find out they could only hear the Tesla coil at very short distances. It seems that a coil by itself is an extremely poor radiator at LF! It is unknown to me if there was any earth connection to the Tesla coil, perhaps only through the mains connection. 73 Warren On Fri, Oct 25, 2013 at 4:20 PM, Christoph Schumacher < chris-schum@t-online.de> wrote: > ** > no, cylindrical coils > > Am 25.10.2013 22:11, schrieb Graham: > > toroidal ? > > *From:* Christoph Schumacher > *Sent:* Friday, October 25, 2013 8:53 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* LF: air solenoids > > Dear all, > is there anyone who was concerned sometime with the self radiating > properties of single layer air solenoids without any piece of antenna wire? > > 73 dl7saq, Chris > > > -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 --089e0160b3dc3963b804e996e4bc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Christoph,
=A0 =A0 A while back someone on the US long= wave reflector posted the result of an experiment. They took a receiver to = the site of a high power Tesla coil operating at LF, I believe it was being= driven at 175kHz. they expected to hear it at some distance but were surpr= ised to find out they could only hear the Tesla coil at very short distance= s. It seems that a coil by itself is an extremely poor radiator at LF! =A0I= t is unknown to me if there was any earth connection to the Tesla coil, per= haps only through the mains connection.

73 Warren




On Fri, Oct 25, 2= 013 at 4:20 PM, Christoph Schumacher <chris-schum@t-online.de>= ; wrote:
=20
no, cylindrical coils

Am 25.10.2013 22:11, schrieb Graham:
=20 =20
toroidal ?

Sent: Friday, October 25, 2013 8:53 PM
Subject: LF: air solenoids

Dear all,
is there anyone who was concerned sometime with the self radiating properties of single layer air solenoids without any piece of antenna wire?

73 dl7saq, Chris





--
73 Warren K2= ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ
=A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2
=A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1

=A0 --089e0160b3dc3963b804e996e4bc--