Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id vBSMHmkc006907 for ; Thu, 28 Dec 2017 23:17:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eUgRE-0004tC-CA for rs_out_1@blacksheep.org; Thu, 28 Dec 2017 22:14:08 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eUgRD-0004t3-Au for rsgb_lf_group@blacksheep.org; Thu, 28 Dec 2017 22:14:07 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eUgRA-0007nr-Hl for rsgb_lf_group@blacksheep.org; Thu, 28 Dec 2017 22:14:06 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id A78F720E61 for ; Thu, 28 Dec 2017 23:14:03 +0100 (CET) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1514499243; bh=FY7jGSzU8sFugEf+QfAv/YcGcb1uGB0y91EeI7N62RA=; h=Date:From:To:Subject:From; b=L+WOONLibEL0/vGFm27NTeM5uSXDE7MFGl/hOmfXDbeiFTAJ9+OlsZ/0Uau2cxetG UYMtr4hwXq42Y+vs5YrUy5XOEREmYbiull3ed/iXbbs/0+HcdUFPtuUfr2n5Vrrqla 6epJEL9Z+9wMCU/KE44/DR95zodpN3r2CckpenakHIEBkZddZxlTlp8NNfVqv0JMhe MIspHOJ/TulCQuM7N0FcVoFcUdFe1ZB1nai0SS3BxR3MaEgFmwJYR2jqWU0TN4IAsq B46/qRGClPHcFK/5XOmERqSgNaGjERezU12Fp6S/p1gSWtFMFJd0VGjOdbXGg17Iae SpN23g5wvUQqQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3z73sQ5Q36z9rxL for ; Thu, 28 Dec 2017 23:14:02 +0100 (CET) Message-ID: <5A456CA9.6010704@posteo.de> Date: Thu, 28 Dec 2017 23:14:01 +0100 From: DK7FC 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: <1608d073056.marcocadeddu@tin.it> <4556666E6F7849679451F95BD8C43FAA@Clemens0811> <9dbb1de2-0d17-b64f-3051-fd63f1f29cc4@n1bug.com> In-Reply-To: <9dbb1de2-0d17-b64f-3051-fd63f1f29cc4@n1bug.com> X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Paul, Am 28.12.2017 21:57, schrieb N1BUG: > It seems the problem must be RF getting into something, RF current > where it does not belong, but only when feeding the antenna. > > An important note: There is no such thing as complete isolation of > antenna ground from shack AC power ground here. Both towers are > grounded for lightning protection, one has an extensive radial field > because I shunt feed the tower on 160m. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: R: Re: LF: TXing 2200m WSPR Content-Type: text/plain; charset=windows-1252; 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 Hi Paul, Am 28.12.2017 21:57, schrieb N1BUG: > It seems the problem must be RF getting into something, RF current > where it does not belong, but only when feeding the antenna. > > An important note: There is no such thing as complete isolation of > antenna ground from shack AC power ground here. Both towers are > grounded for lightning protection, one has an extensive radial field > because I shunt feed the tower on 160m. That can make things even worse, because you have a low impedance closed loop then. As i meant, just build a 1:1 isolation transformer and place it between coax and antenna. Take one of the blue cores you took for the transformer in the PA, using 2x 10 or 2x 15 turns or so. Oh and regarding class AB vs. class D PAs: Build a second one in class-D. It is no problem to get 100W at 13.8V with your U3. Good enough for WSPR, OP32 and of course EbNaut :-) 73, Stefan