Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wAUDCXen029317 for ; Fri, 30 Nov 2018 14:12:34 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gSiQX-0001bM-H0 for rs_out_1@blacksheep.org; Fri, 30 Nov 2018 13:01:49 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gSiN7-0001as-Fw for rsgb_lf_group@blacksheep.org; Fri, 30 Nov 2018 12:58:17 +0000 Received: from mout.perfora.net ([74.208.4.196]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gSiN0-0004Ba-KN for rsgb_lf_group@blacksheep.org; Fri, 30 Nov 2018 12:58:11 +0000 Received: from [192.168.1.127] ([72.224.159.95]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPA (Nemesis) id 0Luuvv-1hSCp02I6r-01031t; Fri, 30 Nov 2018 13:58:03 +0100 To: "rsgb_lf_group@blacksheep.org" , "Discussion of the Lowfer (US, European, & UK) and MedFer bands" From: N1BUG Subject: LF: FET change, hmmm Openpgp: preference=signencrypt Autocrypt: addr=paul@n1bug.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:yJbpuOoRE0hLdWBzabotbgQksPQrOYKMpl89VIi0T8lixGk8/Sc Sy+Zs4RvS2A724lcOI+Te46leLDqDHh3BuB/DoQ5QcNPwtgArKAMFHS7sIhQvDwswatB0+e Tg9pJoemhqW71GWpP6dHJwZWAljCowrC83DVY7+guLWZcWiwU73PgZa/mejhoVcBt+i6Mag ubSJl6PCFBEXrMx5NQOXw== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:dyPsh+RN73k=:JZ4ys+vW8M2+Y4wOYDGpTQ Vk70Jhnhu6kmQoROXH3oBJFxb/rjd2IOXaajzlLq9YaPnBTEUHxL9h4cOxk8SSX7ilEWAT3yT gxboDTWtvdM8Ksdvp5iiXj36PlCOPM+qObkyPwLrAYRD6kYOYHrLKKB8t3mZ0HR+B96+o3JWl RiuGjX+ejY66xAG15+HG/hnEw8xoff8Js+fhtZEfofbBnujRXMzlk6umTaf7NsSlFJ+gDnwjm yhEJe2XL+rtl5+W1A6ecp0gqcK3q7VHwE/bI+derH8Q/C3UhGdbWb4PuFlozpDEnRnWus4qaJ 9aSkMH10UB7MpbXHHRrjj1XPxWS7CcJzZtAFAccaIw2cxI/7hzbrvopLe55T/18gHnDFF0XUT trAuoyQeqslhQwC+SNJROcY1/TP97UjPwSBsH0OXU8ZeW6JuhoNyU952FJ7G7oSzG3k55r5Rq T0RUtj7TDyUVDyCehfiT6exYLmHwykP8C8932T+eIGNsjyXqtMh6m8oRNHAdEaWInTjdIrGsY NJY6TkR4f3i1Ur1Zf4vvQpd4/ghVzdCEBAanZTS6Hm4CfLVBvxs/+UCbETY+mTffGVagBGQHU ESU/gNwZM70kWn1Fl0UuoW+KTvXC/5fPcXFgImnJl/eoIXuzeiMNBs4lI7qZhGDvBVb0QHLko YvrOvm/hCiKIylRxLvf8007rvYvqqNVzfS7i1fCccYfFA1fKTW9T5Sit0QcEEGsdpckcf700G 2NkMsrvjZxGFFsn8PrENhpXH/NHHhtLhAopy4oOHBDESarVSmMzbp6bBEVY= X-Spam-Score: -0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Yesterday I replaced FETs in my 2200 meter amplifier. Since the FQA34N20 is long discontinued I had no choice but to make a substitute. I chose the FQA32N20C because I know of one active station using [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.196 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [74.208.4.196 listed in wl.mailspike.net] X-Scan-Signature: 0a4643e586472c13187d293ec5d096c2 X-SA-Exim-Scanned: No; SA Timed out after 180 secs 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 Yesterday I replaced FETs in my 2200 meter amplifier. Since the FQA34N20 is long discontinued I had no choice but to make a substitute. I chose the FQA32N20C because I know of one active station using them in the same amplifier with success. I notice drain ringing is significantly greater with the new FETs, but maybe acceptable. I have little choice but to run the amp and see how it goes. I also notice the gate voltage decay takes about twice as long as the old FETs. According to the data sheets, turn off fall time on the 32N20C is almost twice that of the 34N20. I suppose that is what I am seeing. I *guess* this may be related to increased ringing, as it appears one side is not fully off as the other begins to switch on. I would appreciate any comments or suggestions, including suggestions for a FET which might leave a longer dead zone at the phase transition. I'd think slow to turn on, fast to turn off would be nice... Alternatively, if anyone has a stash of FQA34N20 purchased from a well respected vendor (old stock) and would be willing to sell some, I may be interested. I've already tried some which originated from a Chinese source and am not interested in going down that road again. :-) 73, Paul N1BUG