Return-Path: X-Spam-DCC: paranoid 1480; 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=-1.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,SPF_PASS,SUBJ_RE_NUM 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 uAEFtwKJ020044 for ; Mon, 14 Nov 2016 16:55:58 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c6JYu-0003AL-5H for rs_out_1@blacksheep.org; Mon, 14 Nov 2016 15:52:48 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c6JYt-0003AC-Sw for rsgb_lf_group@blacksheep.org; Mon, 14 Nov 2016 15:52:47 +0000 Received: from smarthost01a.mail.zen.net.uk ([212.23.1.1]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1c6JYr-0005hl-4q for rsgb_lf_group@blacksheep.org; Mon, 14 Nov 2016 15:52:46 +0000 Received: from [82.70.254.222] (helo=OfficeWin7.lan) by smarthost01a.mail.zen.net.uk with esmtp (Exim 4.80) (envelope-from ) id 1c6JYq-000BCU-DW for rsgb_lf_group@blacksheep.org; Mon, 14 Nov 2016 15:52:44 +0000 Date: Mon, 14 Nov 2016 15:52:44 +0000 From: Chris Wilson Organization: Gatesgarth Developments X-Priority: 3 (Normal) Message-ID: <810421624.20161114155244@chriswilson.tv> To: DK7FC In-Reply-To: <5829DAEA.6000600@posteo.de> References: <94b70e7b-9df6-840a-b056-bf5120cce51a@mvnet.de> <1012028955.20161114113555@chriswilson.tv> <5829BEDA.6020506@posteo.de> <171200537.20161114143136@chriswilson.tv> <5829DAEA.6000600@posteo.de> MIME-Version: 1.0 X-Originating-smarthost01a-IP: [82.70.254.222] Feedback-ID: 82.70.254.222 X-Scan-Signature: 2e2f7cbbe9f38dd7bf3fac4fc012e6fc Subject: Re[2]: LF: Op32: 2E0ILY >>> UA9UIZ 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: 9454 Hello Stefan, Monday, November 14, 2016 I am not convinced it *IS* a mismatch issue, I have a sneaking feeling the FET driver is failing first. But a FET failure can also take out the driver, as well as vice versa I think. It could also be that now i have a full, none drooping, regulated 100V DC to the PA it is a bit too much for them. So I feel a bit in the dark about the failure mode still.... If a lack of drive signal failed to trip the amp, that too may be the cause? I must build an RF ammeter. At the moment I just have a "Scopematch" in the co-ax near the amp, in the shack. > Hi Chris, > What causes the (sudden?) mismatch? Better to find and solve that > problem than building a SWR meter i find. I'm not using any protection > circuits for my PAs, just an Amperemeter is showing the antenna current. > That is important, having no Amperemeter would be like driving a car > without a tachometer :-) > 73, Stefan