Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh03.r1000.mx.aol.com (Internet Inbound) with ESMTP id C3F1238000082; Wed, 11 Jan 2012 07:41:22 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RkxTp-0001cN-Hm for rs_out_1@blacksheep.org; Wed, 11 Jan 2012 12:40:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RkxTp-0001cE-4s for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 12:40:37 +0000 Received: from mail-wi0-f171.google.com ([209.85.212.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RkxTn-00084r-3B for rsgb_lf_group@blacksheep.org; Wed, 11 Jan 2012 12:40:37 +0000 Received: by wibhq7 with SMTP id hq7so550848wib.16 for ; Wed, 11 Jan 2012 04:40:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=v1aAy6REH6wjYt48/YyZyghPZCXq1UVG1gntmO7TeiM=; b=ncXGv+axdu4NLryi8DpbWRvQiy5WYa2fJOQ0giYtmLEIq9NZvWFETt0diTh5idYc7f PVDh1S/Ps3Di/7gjN/qKmIOtjU1+ZBjdcf4TUove7j1xVT3d/l582/9ohsDGjCjqnqo9 k7HsziEwQNt+NC0VazxoiQynFAxPRaLyvLBkc= MIME-Version: 1.0 Received: by 10.180.101.40 with SMTP id fd8mr19270592wib.15.1326285629329; Wed, 11 Jan 2012 04:40:29 -0800 (PST) Received: by 10.216.69.68 with HTTP; Wed, 11 Jan 2012 04:40:29 -0800 (PST) In-Reply-To: <4F0D81E5.4010602@iup.uni-heidelberg.de> References: <4F0CC679.2010206@charter.net> <4F0D81E5.4010602@iup.uni-heidelberg.de> Date: Wed, 11 Jan 2012 07:40:29 -0500 Message-ID: From: "Douglas D. Williams" To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: QRP 1W /PA circuit Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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-SCOLL-SCORE: 0:2:464091200:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d009.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d60d74f0d83722401 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none I'll give a listen tonight, Stefan, if you are still in QRP mode. Doug On 1/11/12, Stefan Sch=E4fer wrote: > 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_schem= atic.jpg), > just in case someone wants to build a similar design and is interested > in general: > > -R=3D 100 Ohm/2W (In series with C, across Drain-Source) > -C=3D 220pF/WIMA FKP-1 2kV (In series with R, across Drain-Source) > -MOSFET: The IRFP460 > will be > replaced by a SPW20N60C3 > :-) > > 73, Stefan/DK7FC >