Return-Path: Received: from mtain-mb10.r1000.mx.aol.com (mtain-mb10.r1000.mx.aol.com [172.29.96.30]) by air-da09.mail.aol.com (v129.4) with ESMTP id MAILINDA092-86194c032dbb272; Sun, 30 May 2010 23:32:11 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 02F07380000F9; Sun, 30 May 2010 23:32:09 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OIvhX-0008L8-87 for rs_out_1@blacksheep.org; Mon, 31 May 2010 04:30:07 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OIvhW-0008Kz-NA for rsgb_lf_group@blacksheep.org; Mon, 31 May 2010 04:30:06 +0100 Received: from mailout-us.gmx.com ([74.208.5.67]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OIvhU-0003ua-Dw for rsgb_lf_group@blacksheep.org; Mon, 31 May 2010 04:30:06 +0100 Received: (qmail invoked by alias); 31 May 2010 03:03:16 -0000 Received: from 75-168-133-142.mpls.qwest.net (EHLO [192.168.1.100]) [75.168.133.142] by mail.gmx.com (mp-us001) with SMTP; 30 May 2010 23:03:16 -0400 X-Authenticated: #60769621 X-Provags-ID: V01U2FsdGVkX1/99uN+Y+L9uvmogmTAjbf4RSwZh+UbxEvILpNwiV NOplwvqA0G6P92 Message-ID: <4C0326F4.5050609@gmx.com> Date: Sun, 30 May 2010 22:03:16 -0500 From: "Mike.WE0H" User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <20100530.082855.1608.1.riese-k3djc@juno.com> <4C02783D.9020502@gmx.com> In-Reply-To: X-Y-GMX-Trusted: 0 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; format=flowed 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: 3039ac1d601e4c032db9206e X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) 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