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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <19864612.20180918121009@gmail.com> Content-Language: en-US X-Provags-ID: V03:K1:kY0+rWQodbpyXD31j5VbsdjGOEAs91MebLpYaHGk049bKH3KnDB Pq092ZCtNq71v9wpjMi+/7uPlOfoOlIc4EriKGquFW7OFNX8E8I+82HDKPvax+Z/Ufr8gCZ 1JYy6DGLgRdwkgqF+lcjjICGoI2PkwOb2NHVQdQ7rcm8RpzwQI3fofw4rJPTF1/8m9GWkvk rv67hr2folV9aQcGg+xQA== X-UI-Out-Filterresults: notjunk:1;V01:K0:TtaFAdGAon0=:DOSiI9MBjqNdyebkOPPJka SvIGRExBgkX9di3gP19jaCV+RLszuzusCt02wouhDWkWu8Lre38kTZ1CGibbUR6aXgXfNAGwT lmttf/ziO24222t2yF6/iBDuOlcIv1YfjnnyrGLpaQhKJXOkKkOyfqEQb/ARDiduGiEFx4KHW 3AmoEw7sZThnK3W5GHt+Lli2otCPqshilHdYCSi1c0sjEnNZM2OwSWclpGSVQzgAmrwEC1EpN /3iI9xifKnOmmGhpfhkIwtITjaD2Z3HYt21mKR4dAOnDNFfi6A1YcuelQMcKDEoDhdL8vUrug zkk55EbEh77Wi98EA8o2km6MCEszVmKGXxrA9R1FJgpmQ9THKFCSrp/XlVLGo2bseZIBILDDA 5UdvB1wdS0h+W62kq/EGVzBLR3BRs8nq67T/RwTjH6cm+Qrlvtd9iOUvbbsN8Jmk49eBjuD9U bc6PLPnmIuSuNKbJf0mq4TyEpG3g/uDOYxBEy/KyA8LB0fhXfIcvooKx6L7vxPLiQX41KR/b2 acc3RH38HA8obKukoM2CurBqempSDIAKdLTzmQaAkXLZvS6cfVgVWJ3jGYBDZIkYU7N6GabA6 Cwwkf+4/V7uqqA2WvWIzA6YP2+U+lRqNbfCG81/uzZikEEwThp49iUvBzQsWnUmwKGKxcU7m0 chY5wO37c1hehrH2A6BSfOoCLzcXhv8pO4L0n402PdGmwZa6TDv5n+HPuFSCL/dIUVeTqLwp7 Idnrec+8qeGLZzXL 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: On 09/18/2018 07:10 AM, Chris Wilson wrote: > With devices like this, (linked to below), limited to a max of 36V how > do you apply the technology to say a Class D FET ended RF amp running > on 60v or even rectified 240V mains? And secondly, with the amp > powered, when a signal is applied, let's say the digital amateur mode, > WSPR commences, there is a high current for a short time. How do you > allow for this yet provide effective over current protection for > rapidly failing devices like FET's? Thanks > > http://www.ti.com/product/INA300 [...] 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 [74.208.4.197 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [74.208.4.197 listed in wl.mailspike.net] -0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: 87966b345956c8ef3389b993f6a18f4e Subject: Re: LF: Re: And again! Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit 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 On 09/18/2018 07:10 AM, Chris Wilson wrote: > With devices like this, (linked to below), limited to a max of 36V how > do you apply the technology to say a Class D FET ended RF amp running > on 60v or even rectified 240V mains? And secondly, with the amp > powered, when a signal is applied, let's say the digital amateur mode, > WSPR commences, there is a high current for a short time. How do you > allow for this yet provide effective over current protection for > rapidly failing devices like FET's? Thanks > > http://www.ti.com/product/INA300 I'm afraid I can't help with that one. I spent some time trying to figure out how to implement SWR and over current protection but didn't come up with anything. I'll just have to use the FETs as sacrificial devices. I am a bit puzzled by the current spike on start of transmission. What would cause that? Paul