Return-Path: Received: (qmail 12654 invoked from network); 31 Jul 2002 18:06:31 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 31 Jul 2002 18:06:31 -0000 Received: (qmail 2168 invoked from network); 31 Jul 2002 18:06:33 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 31 Jul 2002 18:06:33 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17ZzRY-0002sF-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 31 Jul 2002 20:47:36 +0100 Received: from mta1-svc.business.ntl.com ([62.253.164.41]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17ZzRX-0002sA-00 for rsgb_lf_group@blacksheep.org; Wed, 31 Jul 2002 20:47:35 +0100 Received: from l8p8y6 ([62.252.232.234]) by mta1-svc.business.ntl.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20020731175605.ZUZS19938.mta1-svc.business.ntl.com@l8p8y6> for ; Wed, 31 Jul 2002 18:56:05 +0100 Message-ID: <000201c238b5$46736980$eae8fc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20020730111943.00a25240@POP3.freeler.nl> Subject: Re: LF: Re: Re: Power of Donebach 153kHz TX Date: Wed, 31 Jul 2002 11:15:55 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: ----- Original Message ----- From: "M.J.Powell" To: Sent: Tuesday, July 30, 2002 2:07 PM Subject: Re: LF: Re: Re: Power of Donebach 153kHz TX > snip > > > Remarkable is Droitwich at 198kHz. There the carrier goes > > downward during modulation! > > I used to get that with my old AM Tx in the 50's! Cause: Lack of grid > drive and improper loading/tuning. I wonder which it is now... You are correct, it is no doubt still the same today. Adjusting those old transmitters could be difficult, maybe make a bad job worse. Downward modulation on AM transmitters was considered poor engineering amongst radio amateurs in the early years, and poor CW even worse. These days some do not know what either Downward mod or CW means!!!! G3KEV > > Mike > -- > M.J.Powell > >