Return-Path: Received: from mtain-de04.r1000.mx.aol.com (mtain-de04.r1000.mx.aol.com [172.29.64.204]) by air-da07.mail.aol.com (v129.4) with ESMTP id MAILINDA073-863f4c0e4e3c266; Tue, 08 Jun 2010 10:05:48 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-de04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 91200380045C8; Tue, 8 Jun 2010 10:05:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OLzPx-0007ar-LS for rs_out_1@blacksheep.org; Tue, 08 Jun 2010 15:04:37 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OLzPr-0007W0-8K for rsgb_lf_group@blacksheep.org; Tue, 08 Jun 2010 15:04:31 +0100 Received: from out1.ip06ir2.opaltelecom.net ([62.24.128.242]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OLzPp-0008JO-Cp for rsgb_lf_group@blacksheep.org; Tue, 08 Jun 2010 15:04:31 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtkGADbqDUxOk8/d/2dsb2JhbACBQ41Agy2ME3G9ZoJXgj8E X-IronPort-AV: E=Sophos;i="4.53,384,1272841200"; d="scan'208,217";a="460782801" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.207.221]) by out1.ip06ir2.opaltelecom.net with SMTP; 08 Jun 2010 15:04:21 +0100 Message-ID: <004201cb0713$7c295e10$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <002001cb070c$99d44b20$0401a8c0@xphd97xgq27nyf> Date: Tue, 8 Jun 2010 15:04:17 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: RE: COIL WINDING THOUGHT Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01CB071B.DDBE0380" 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_40_50,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 x-aol-global-disposition: G x-aol-sid: 3039ac1d40cc4c0e4e39304d X-AOL-IP: 193.82.116.20 ------=_NextPart_000_003F_01CB071B.DDBE0380 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jim and Co will hardly be involved with 30kv more like 3kv or less They will let us know g3kev ----- Original Message -----=20 From: Rik Strobbe=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, June 08, 2010 2:47 PM Subject: LF: RE: COIL WINDING THOUGHT Beware of the very high voltages between the strands. Stefan mentioned up to 30kV loading coil voltage, I guess even a fra= ction of this voltage will cause arcing between the strands In addition the high stray capacitance will reduce the Q. 73, Rik ON7YD ----------------------------------------------------------------------= -------- Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksh= eep.org] namens mal hamilton [g3kevmal@talktalk.net] Verzonden: dinsdag 8 juni 2010 15:15 Aan: rsgb Onderwerp: LF: COIL WINDING THOUGHT All vlf men Instead of winding miles of single strand insulated wire to achive= the required inductance, use instead insulated multi strand wire and= series the strands, normally the individual strands have coloured ins= ulation and convenient to connect in series. also gather up all the ferrite cores you can find put into a suitable con= tainer and insert into coil. The above idea might save some coil winding time. another thouight while I am composing Litz wire. Get hold of some old Decca coils ( I have a couple) find the beginni= ng and end and do the same as above, this however is more difficult al= though individually insulated they are all the same colour, but with= a meter to identify each strand it can be done de mal/g3kev ------=_NextPart_000_003F_01CB071B.DDBE0380 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jim and Co will hardly be involved wi= th 30kv more=20 like 3kv or less
They will let us know
g3kev
 
 
----- Original Message -----
From:=20 Rik Strobbe
Sent: Tuesday, June 08, 2010= 2:47=20 PM
Subject: LF: RE: COIL WINDING= =20 THOUGHT

Beware of the very high voltages between the strands.
Stefan mentioned up to 30kV loadin= g coil=20 voltage, I guess even a fraction of this voltage will cause arcing= between the=20 strands
In addition the high stray capacit= ance will=20 reduce the Q.
&= nbsp;
73, Rik  ON7YD
&= nbsp;
Van: owner-rsgb_lf_group@bla= cksheep.org=20 [owner-rsgb_lf_group@blacksheep.org] namens mal hamilton=20 [g3kevmal@talktalk.net]
Verzonden: dinsdag 8 juni 2010=20 15:15
Aan: rsgb
Onderwerp: LF: COIL WINDING=20 THOUGHT

All vlf men
Instead of winding miles of single= strand=20 insulated wire to achive the required inductance, use instead insula= ted multi=20 strand wire and series the strands, normally the individual strands= have=20 coloured insulation and convenient to connect in series.
also
gather up all the ferrite cores you= can find put=20 into a suitable container and insert into coil.
The above idea might save some coil= winding=20 time.
 
another thouight while I am=20 composing
 
Litz wire.
 
Get hold of some old Decca coils (= I have a=20 couple) find the beginning and end and do the same as above, this ho= wever is=20 more difficult although individually insulated they are all the same= colour,=20 but with a meter to identify each strand it can be done
 
de mal/g3kev
 
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