Return-Path: Received: from mtain-de06.r1000.mx.aol.com (mtain-de06.r1000.mx.aol.com [172.29.64.206]) by air-df02.mail.aol.com (v129.4) with ESMTP id MAILINDF021-5ee64c9a5d182c7; Wed, 22 Sep 2010 15:46:32 -0400 Received: from post.thorcom.com (unknown [195.171.43.25]) by mtain-de06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 764E538000083; Wed, 22 Sep 2010 15:46:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OyUwv-0003cG-Nj for rs_out_1@blacksheep.org; Wed, 22 Sep 2010 20:25:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OyUwl-0003c7-E6 for rsgb_lf_group@blacksheep.org; Wed, 22 Sep 2010 20:25:39 +0100 Received: from smtp-vbr7.xs4all.nl ([194.109.24.27]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OyUwk-00075i-1h for rsgb_lf_group@blacksheep.org; Wed, 22 Sep 2010 20:25:40 +0100 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr7.xs4all.nl (8.13.8/8.13.8) with ESMTP id o8MJPVDQ095229 for ; Wed, 22 Sep 2010 21:25:37 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <000c01cb5a7a$44cfcc50$0401a8c0@xphd97xgq27nyf> <4C1A271605FB0B62@smtp208.alice.it> Date: Wed, 22 Sep 2010 21:25:26 +0200 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <4C1A271605FB0B62@smtp208.alice.it> User-Agent: Opera Mail/10.62 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: PA0RDT miniwhip in TX? 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d40ce4c9a5d1743fc X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hello Marco, This question comes up from time to time. I have not had a single report of failure, due to mounting the antenna close to a transmitting antennas. The J310 is quite sturdy. Steve Ratzlaff, AA7U, has tested it in parallel to a 50 ohm dummy and 100 W RF and it happily survived. KL7X had a lightning strike 25 m from his mini-whip and it was still OK. The only problems encountered was when people accidentally sent 100 W RF up the feedline. This fried the 220 ohm emitter resistor of the 2N5109 and the 2N5109 itself, but nothing else. Due to the small capture area of the PCB antenna, high voltages don't easily develop. If your friend has a problem, I will sent him 10 J310's for free! 73, Roelof, pa0rdt