Return-Path: Received: from mtain-dg02.r1000.mx.aol.com (mtain-dg02.r1000.mx.aol.com [172.29.65.10]) by air-mf08.mail.aol.com (v129.4) with ESMTP id MAILINMF081-8bf54c03f671ec; Mon, 31 May 2010 13:48:33 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg02.r1000.mx.aol.com (Internet Inbound) with ESMTP id EC85A38000099; Mon, 31 May 2010 13:48:30 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OJ94p-0005lY-Ul for rs_out_1@blacksheep.org; Mon, 31 May 2010 18:47:03 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OJ94p-0005lP-IX for rsgb_lf_group@blacksheep.org; Mon, 31 May 2010 18:47:03 +0100 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OJ94m-0004N8-U4 for rsgb_lf_group@blacksheep.org; Mon, 31 May 2010 18:47:03 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiULAD+SA0xOk8Vr/2dsb2JhbACHXYpPjAdxwAqFFgQ X-IronPort-AV: E=Sophos;i="4.53,334,1272841200"; d="scan'208";a="312516999" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.197.107]) by out1.ip01ir2.opaltelecom.net with SMTP; 31 May 2010 18:46:53 +0100 Message-ID: <002301cb00e9$41e2be70$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <20100530.082855.1608.1.riese-k3djc@juno.com> <4C02783D.9020502@gmx.com> <4C0326F4.5050609@gmx.com> Date: Mon, 31 May 2010 18:46:53 +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,none Subject: Re: LF: 8.97kc - TV transformer info needed Content-Type: text/plain; charset="iso-8859-1" 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=0.0 required=5.0 tests=none 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: 3039ac1d410a4c03f66e6db7 X-AOL-IP: 193.82.116.20 Mike What way have you it configured regarding antenna. mal/g3kev ----- Original Message ----- From: "Mike.WE0H" To: Sent: Monday, May 31, 2010 4:03 AM Subject: Re: LF: 8.97kc - TV transformer info needed > Well worth testing. There might be some other transformers that work and > we won't know which ones until someone tests them. Looks like 4kc is > the peak of efficiency on that transformer you tested. I found 5.8kc is > the best efficiency on my TV transformer. > > Mike > WE0H > > > > > John B wrote: > > Hi Mike, LFers, > > > > I grabbed one of my many MOTs and ran some tests with the primary connected to a signal generator's 600 ohm > > output and the secondary connected to a VTVM. The measured L of the primary is .047 H and the secondary L is > > 16 H. The turns ratio (120 Volt Primary) is 1:18 give or take a bit. > > > > With the signal generator set at 10 volts RMS, the secondary voltage was measured at 1 kHz. steps as below: > > > > Freq. in kHz. Sec. voltage > > > > 1 120 > > 2 150 > > 3 190 > > 4 250 > > 5 210 > > 6 160 > > 7 140 > > 8 110 > > 9 85 > > 10 60 > > > > The results are poor, just as you found Mike, so it looks like we can rule out using MOTs for Dreamers Band. > > It's about what one might expect from a transformer designed for 60 Hz. operation. > > > > 73, J.B., VE3EAR > > > > LowFER Beacon "EAR" > > 188.830 kHz. QRSS30 >