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=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,SPF_PASS 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 u6UDGxnL023847 for ; Sat, 30 Jul 2016 15:16:59 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bTU4s-00065P-Aj for rs_out_1@blacksheep.org; Sat, 30 Jul 2016 14:13:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bTU4k-00065G-6F for rsgb_lf_group@blacksheep.org; Sat, 30 Jul 2016 14:13:10 +0100 Received: from smarthost03a.mail.zen.net.uk ([212.23.1.20]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1bTU4h-00043u-OB for rsgb_lf_group@blacksheep.org; Sat, 30 Jul 2016 14:13:08 +0100 Received: from [82.70.254.222] (helo=OfficeWin7.lan) by smarthost03a.mail.zen.net.uk with esmtp (Exim 4.80) (envelope-from ) id 1bTU4g-0005xv-AU for rsgb_lf_group@blacksheep.org; Sat, 30 Jul 2016 13:13:06 +0000 Date: Sat, 30 Jul 2016 14:13:05 +0100 From: Chris Wilson Organization: Gatesgarth Developments X-Priority: 3 (Normal) Message-ID: <733942171.20160730141305@chriswilson.tv> To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Originating-smarthost03a-IP: [82.70.254.222] X-Scan-Signature: e90dcb17768c7e768f13e0721cc1c0c7 Subject: LF: My active whip antenna has gone noisy and insensitive 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8472 30 July 2016 I have a a clone PA0RDT active mini whip antenna atop a wind up mast that used to work well, but has recently become insensitive and very noisy. I will pull it down later and first check the co ax. If I remove its in shack power source the noise stops though, and I have tried it on a battery in case the PSU had gone noisy, but no difference in noise on battery power is seen. The circuit is at http://dl1dbc.net/SAQ/Mwhip/pa0rdt-Mini-Whip.pdf Can anyone say if the front end FET may have gone faulty, or what to check please? Thanks! -- Best regards, Chris 2E0ILY mailto:chris@chriswilson.tv My part time LF grabber is at http://www.chriswilson.tv/grabber.html