Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0BCFF380000AC; Tue, 11 Oct 2011 07:18:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RDaL4-00039Q-K7 for rs_out_1@blacksheep.org; Tue, 11 Oct 2011 12:17:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RDaL4-00039H-64 for rsgb_lf_group@blacksheep.org; Tue, 11 Oct 2011 12:17:38 +0100 Received: from smtp5.freeserve.com ([193.252.22.159]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RDaL2-00031U-9w for rsgb_lf_group@blacksheep.org; Tue, 11 Oct 2011 12:17:38 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3412.me.freeserve.com (SMTP Server) with ESMTP id 642221C000AB for ; Tue, 11 Oct 2011 13:17:30 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3412.me.freeserve.com (SMTP Server) with ESMTP id 534B31C000AA for ; Tue, 11 Oct 2011 13:17:30 +0200 (CEST) Received: from AGB (unknown [2.26.46.67]) by mwinf3412.me.freeserve.com (SMTP Server) with SMTP id E5FAF1C000AB for ; Tue, 11 Oct 2011 13:17:27 +0200 (CEST) X-ME-UUID: 20111011111727942.E5FAF1C000AB@mwinf3412.me.freeserve.com Message-ID: <834DCCD1D3834F4CB4C171B7C30E85B4@AGB> From: "Graham" To: References: <4E91694C.8060900@orange.fr> <4E9169AD.8090609@wanadoo.fr> <4E918C0E.30401@freenet.de> <4E918FF1.1010407@iup.uni-heidelberg.de> <1318166502.15085.YahooMailNeo@web28106.mail.ukl.yahoo.com> <1849736542-1318171189-cardhu_decombobulator_blackberry.rim.net-208700020-@b1.c11.bise7.blackberry> <4E920BBA.9040200@iup.uni-heidelberg.de> <4E934A40.9040204@gmx.de> <006c01cc87ab$427234c0$4001a8c0@lark> In-Reply-To: Date: Tue, 11 Oct 2011 12:17:27 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 111011-0, 11/10/2011), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c. Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-SCOLL-SCORE: 0:2:519874080:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d411a4e94261d6f91 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Joe.. There are some 'good' rf relays at :- http://www.surplussales.com/Relays/rfopen.html Ive used the small open frame one's for some time on the HF bands may be a couple of the 6 Kv open frame in series would work ? G.. -------------------------------------------------- From: Sent: Tuesday, October 11, 2011 2:11 AM To: Subject: Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c. > > Hi Alan, Group. > > Thank-you for the reply. Multiple contacts in series were considered... > but the gap has to > increase by orders magnitude! How much gap will I need for 50 kV? > > Your spiral pie story was most enlightening. My pies are ~35 turns of > 4mm litz about 37 cm diameter with L=0.24 mH. A stack of 4 yields > 3mH. Each pie has ~23 metres of litz. Do you think this is will give > the most L for the least length of litz? > > VX9MRC is still sending the 8 WPM beacon as yours truly looks at a fried > relay... > > Cheers > Joe > > On Tue, 11 Oct 2011, Alan Melia wrote: > >> Hi Joe, why not stick two sets of normal contacts in series....doubles >> the >> gap :-)) >> >> Alan >> >> ----- Original Message ----- >> From: >> To: >> Sent: Monday, October 10, 2011 11:54 PM >> Subject: Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c. >> >> >>> Hello Hartmut, Group. >>> >>> Good to hear from you again, Hartmut. Thank-you for the report. >>> >>> The beacon is on again, but there was some trouble: to use the tower >>> on 160m the 500 kHz tuning coil (0.2 mH) is shorted by a relay. The >>> N.O. contacts on this relay arced over. Perhaps a high voltage (vacuum) >>> relay would help? >>> >>> This problem will be much worse on 137.777 kHz with the higher voltage. >>> I have some spiral wound 4mm (Decca) litz to make up the 3 mH for that >>> project. (The spiral winding was inspired by G3NYK's experiments with >>> tuning coils on his web page.) >>> >>> 73 >>> Joe >>> >>> On Mon, 10 Oct 2011, Hartmut Wolff wrote: >>> >>>> Am 2011-10-09 23:50, wrote jcraig@mun.ca: >>>>> Dear Group, >>>>> Reports on the 8 WPM CW beacon will be appreciated! >>>>> 73 >>>>> Joe VO1NA >>>> >>>> Attached a screenshot of the 8wpm signal. The signal came up at about >> 23:20 >>>> and faded out at about 7:35. The strongest part was between 04:00-06:00 >> UTC >>>> -- >>>> 73 >>>> Hartmut >>>> www.h-wolff.de >>>> Locator: JO52hp >>>> >>> >>> This electronic communication is governed by the terms and conditions at >>> >> http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php >>> >> >> >> > > This electronic communication is governed by the terms and conditions at > http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php > >