Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id CD9AA38000091; Fri, 18 Nov 2011 07:26:06 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RRNVW-0007wE-QH for rs_out_1@blacksheep.org; Fri, 18 Nov 2011 12:25:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RRNVW-0007w5-Bs for rsgb_lf_group@blacksheep.org; Fri, 18 Nov 2011 12:25:26 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RRNVV-0006bC-Rh for rsgb_lf_group@blacksheep.org; Fri, 18 Nov 2011 12:25:26 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id pAICPPYu011918 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 18 Nov 2011 13:25:25 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id pAICPPYL006485 for ; Fri, 18 Nov 2011 13:25:25 +0100 Message-ID: <4EC64E66.2000704@iup.uni-heidelberg.de> Date: Fri, 18 Nov 2011 13:24:06 +0100 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4EC535F4.5000106@iup.uni-heidelberg.de> <4EC545C1.9040701@legal-medicine.de> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: beacon to the east and west and north and south... Content-Type: multipart/alternative; boundary="------------030805090603020509080106" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TITLE_EMPTY 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: 0:2:476842720:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d411a4ec64ede0d85 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------030805090603020509080106 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Peter, Markus, Thanks for the feedback, very useful! I found that it is due to the secondary ferrite core that became hot. I just checked if it is due to saturation or due to copper losses in the windings, by applying the LF voltage (300V pp) without a load. The core remains cold then. So it must be due to copper losses i think. So i think i have to use RF litz wire on the ferrite core and then look what happens... Will go on playing on the roof now and try various configurations. 73, Stefan/DK7FC Am 17.11.2011 22:45, schrieb Markus Vester: > Stefan, > confirming Peter's observation at 21:40: It seems that the first 5 > dashes of each callsign are sent at full power, and then there is a > sudden ~ 6 dB drop in each of the subsequent dashes. > 73, Markus (DF6NM) > *From:* pws > *Sent:* Thursday, November 17, 2011 6:34 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: beacon to the east and west and north and south... > > Hi Stefan, > > You wrote: > > ... > > Now i'm back on 136.172 kHz and will transmit all the time until early > > morning in DFCW-90 on 136.172 kHz. > >... > > Clearly visible here at Kiel, ~32 dB below HGA22. > I'm not sure but may be all your characters are > fading out by approx. -4 dB? Looks like a thermal > drop. > > Peter, df3lp --------------030805090603020509080106 Content-Type: text/html; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay2.uni-heidelberg.de id pAICPPYu011918 Peter, Markus,

Thanks for the feedback, very useful!

I found that it is due to the secondary ferrite core that became hot. I just checked if it is due to saturation or due to copper losses in the windings, by applying the LF voltage (300V pp) without a load. The core remains cold then. So it must be due to copper losses i think. So i think i have to use RF litz wire on the ferrite core and then look what happens...
Will go on playing on the roof now and try various configurations.

73, Stefan/DK7FC

Am 17.11.2011 22:45, schrieb Markus Vester:
Stefan,
=A0
confirming Peter's observation at 21:40: It seems that the first 5 dashes of each callsign are sent=A0at full power, and then there is a sudden ~ 6 dB=A0drop in each of the subsequent dashes.
=A0
73, Markus (DF6NM)
=A0
From: pw= s
Sent: Thursday, November 17, 2011 6:34 PM
Subject: Re: LF: beacon to the east and west and north and south...

Hi Stefan,

You wrote:
> ...
> Now i'm back on 136.172 kHz and will transmit all the time until early
> morning in DFCW-90 on 136.172 kHz.
>...

Clearly visible here at Kiel, ~32 dB below HGA22.
I'm not sure but may be all your characters are
fading out by approx. -4 dB? Looks like a thermal
drop.

Peter, df3lp
--------------030805090603020509080106--