Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 75D5D380000A4; Wed, 11 Jan 2012 07:35:51 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RkxOL-0001Ve-Mn for rs_out_1@blacksheep.org; Wed, 11 Jan 2012 12:34:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RkxOL-0001VV-6V for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 12:34:57 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RkxOK-0007xQ-5j for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 12:34:57 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q0BCYt9e020038 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 11 Jan 2012 13:34:55 +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 q0BCYpT4004536 for ; Wed, 11 Jan 2012 13:34:51 +0100 Message-ID: <4F0D81E5.4010602@iup.uni-heidelberg.de> Date: Wed, 11 Jan 2012 13:34:45 +0100 From: =?ISO-8859-1?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: <4F0CC679.2010206@charter.net> In-Reply-To: <4F0CC679.2010206@charter.net> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: LF: QRP 1W /PA circuit Content-Type: multipart/alternative; boundary="------------070800090103050705030701" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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: 1:2:427239456:93952408 X-AOL-SCOLL-URL_COUNT: 2 x-aol-sid: 3039ac1d61884f0d82272b38 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------070800090103050705030701 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit LF, Last night i shot my PA again :-( No replacement FETs were available so i had to stay quite during the night. Replacement parts are ordered now and will arrive tomorrow :-) During that time i will run a *LF beacon on 136.172 kHz running _1W TX power_ in DFCW-90*, starting in the afternoon. If someone can receive that weak *QRPP* signal, then a* report is very apprechiated :-)* Also i will do some optimisations on my recently posted PA output stage (http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schematic.jpg), just in case someone wants to build a similar design and is interested in general: -R= 100 Ohm/2W (In series with C, across Drain-Source) -C= 220pF/WIMA FKP-1 2kV (In series with R, across Drain-Source) -MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-) 73, Stefan/DK7FC --------------070800090103050705030701 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit LF,

Last night i shot my PA again :-( No replacement FETs were available so i had to stay quite during the night. Replacement parts are ordered now and will arrive tomorrow :-)

During that time i will run a LF beacon on 136.172 kHz running 1W TX power in DFCW-90, starting in the afternoon. If someone can receive that weak QRPP signal, then a report is very apprechiated :-)

Also i will do some optimisations on my recently posted PA output stage (http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_TX_antenna_and_PA_schematic.jpg), just in case someone wants to build a similar design and is interested in general:

-R= 100 Ohm/2W (In series with C, across  Drain-Source)
-C= 220pF/WIMA FKP-1 2kV  (In series with R, across Drain-Source)
-MOSFET: The IRFP460 will be replaced by a SPW20N60C3 :-)

73, Stefan/DK7FC
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