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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD,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 uAEGOq48021725 for ; Mon, 14 Nov 2016 17:24:52 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c6K0j-0003Lu-C1 for rs_out_1@blacksheep.org; Mon, 14 Nov 2016 16:21:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c6K0i-0003Lk-0y for rsgb_lf_group@blacksheep.org; Mon, 14 Nov 2016 16:21:32 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1c6K0f-0005pa-H6 for rsgb_lf_group@blacksheep.org; Mon, 14 Nov 2016 16:21:30 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 0430820461 for ; Mon, 14 Nov 2016 17:21:27 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3tHbPM4YHZz103v for ; Mon, 14 Nov 2016 17:21:27 +0100 (CET) Message-ID: <5829E487.7070102@posteo.de> Date: Mon, 14 Nov 2016 17:21:27 +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: <94b70e7b-9df6-840a-b056-bf5120cce51a@mvnet.de> <1012028955.20161114113555@chriswilson.tv> <5829BEDA.6020506@posteo.de> <171200537.20161114143136@chriswilson.tv> <5829DAEA.6000600@posteo.de> <810421624.20161114155244@chriswilson.tv> In-Reply-To: <810421624.20161114155244@chriswilson.tv> X-Scan-Signature: 0b2d339ae1d48966556dfb6ad64e2bce Subject: Re: LF: Op32: 2E0ILY >>> UA9UIZ Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: 9455 Hi Chris, Am 14.11.2016 16:52, schrieb Chris Wilson: > If a lack of drive signal failed to trip the amp, that too may > be the cause? Yes, sure. Check the gate-source voltage during a transmission (using the antenna) with a scope. I don't know the design of your PA but if it is a switch mode PA, the rise time of the Vgs should be in the range of 100 ns or shorter. Post a capture of that measurement if you like. > I must build an RF ammeter. At the moment I just have > a "Scopematch" in the co-ax near the amp, in the shack ...which is even more informative but maybe not so comfortable for a quick check. I can recommend the "tuning meter" shown by M0BMU, if you want a better overview without running the scope all the time. You probably know it. It is very useful and easy to build on LF. 73, Stefan