Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u19GHcfB027750 for ; Tue, 9 Feb 2016 17:17:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aTAvL-0005n1-Ll for rs_out_1@blacksheep.org; Tue, 09 Feb 2016 16:13:55 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aTAvL-0005mg-Cg for rsgb_lf_group@blacksheep.org; Tue, 09 Feb 2016 16:13:55 +0000 Received: from lb3-smtp-cloud6.xs4all.net ([194.109.24.31]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1aTAuK-0001XP-21 for rsgb_lf_group@blacksheep.org; Tue, 09 Feb 2016 16:13:54 +0000 Received: from [192.168.178.20] ([83.162.220.82]) by smtp-cloud6.xs4all.net with ESMTP id GGCa1s00E1nG4D701GCbEL; Tue, 09 Feb 2016 17:12:36 +0100 From: "Roelof Bakker" To: rsgb_lf_group@blacksheep.org Date: Tue, 09 Feb 2016 17:12:34 +0100 MIME-Version: 1.0 Message-ID: <56BA0FF2.32233.300A2E@roelof.ndb.demon.nl> In-reply-to: <579355A36AEE9D4FA555C45D556003AB2533CC43@servigilant.vigilant.local> References: <56B9CC5E.27362.3B9702@roelof.ndb.demon.nl>, <579355A36AEE9D4FA555C45D556003AB2533CC43@servigilant.vigilant.local> X-mailer: Pegasus Mail for Windows (4.70) Content-description: Mail message body X-Scan-Signature: 87966b345956c8ef3389b993f6a18f4e Subject: Re: LF: RE: Vlf ot Penguins and awesomes - More Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 6765 Hello Luis, The antenna is fed over the coax. DC is injected via the primary winding of the isolating transformer. The ground connection of this winding is isolated for DC but for RF the path to ground is via a 1 uF and 220 uF capacitor. This works excellent and a rf choke can be omitted. Regarding battery feed versus mains power, so far I have not been able to find any difference between the two. The major point with active whip antennas is to connect the shield of the coax to a ground stake (or building frame, when you live in a high rise building). At my location I have a ground stake at the bottom of the mast and at the cable entry to the house. Either work the same. 73, Roelof Bakker, pa0rdt