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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Provags-ID: V03:K1:4LKDPBnT+jorh1uUie1KOXIy4c9UBin1ZBFBIH1SAZjyJ6mO1wt yn0ksv9D4Pb3wnAyaLmFibvtIBSqz1jiKWQmQeWQFTmWQ+vAjioMO+6BsBRr+tG4aowRT8t wzITZItQmgxA8pU2qxOXSkSg9My3JniAMZ1MI3TPH508wDcEIYONfEs/A7xzl5bwuq7XOUt LiX3AYCBm2zpsLh9FMHhQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:WWPFd2+G7Zo=:MRedL07ar+o213P/Blx2UY DughGttbRMeoVVRAJeq58/StFGVPmWEopbcEjxXoybUKVK8TlWDXz80TU2A+/frfZ3uE6RMKJ wrhVKzCz6TDkshJ3XDjPv0VD9NlfitaqFUzn+0rmRe5JdVFMjpGUWcbTBNKtq6jn5lRou9W/L AcdGOsOuePUuaIWRtQL0EHvykw3Z66JDDBF9cubEmlrsE9lhK3ZrKjHEDyWmeMEWws/09fSTV GPoh2kb8Jkk2ryQ57TWSQIu6ZNfAEgLDR4M8BqGCchocbvgozAxqPz1RrT71Vsp3h2OeZabWh loNQ6xJcLCMMS4wNuz5UmDBbOqkQwZYFstBHQOirVQhoDa+3bRW9k0CPRceMOWnbtdLAnkhTN uA7NfGjwD45oO8+RtuGI/a5lda8isWjiclg6wKoW67qF8+5lgBKrKQkAoQMFj4mxK1fb5fZEO o2K4RuGeGyWxdjzmL4FPR8ieMBTjCHNtCpZaWfoiqZh8OPwoQrg3tWD8a/hPkO+B0oMuVlfz2 cz7wVuUFmDHsmqKX3ymKvaARo/T4sbt+x/zC+Vz6AsCc2jAgXZWcA0pKoJDI1c9Xgk7bFZQwV Y1kWREu1xRpcKDStDjfTFEsWgHeZUaGj13B/K5QjBimi5PXYX4OCONt1DvUY8xMOBKF+HLieV CLV4RZPvFO/enABMUTP9kEVmGqPNbMofximQkYg8bbIStX6pue5GRC6UXKIuRW9XEvelXWpdW 8rsfvrglekF/xyizS7W07mroiG8u4hubIP5jeojZSV00rSOtTqJY4DSV6LY= 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 the administrator of that system for details. Content preview: I will be watching this discussion closely. Mine is a W1VD kilowatt deck: http://w1vd.com/137-500-KWRev3.0.pdf It has blown FETs several times. The problem always occurs at the end of the RF envelope. To further confuse this issue, I have lost only one FET while running with my U3S exciter in hundreds of hours [...] 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 X-Scan-Signature: e09cca6d8e44a91eadbdfb3e1b8aec09 Subject: Re: LF: Re: Class D current spikes 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 I will be watching this discussion closely. Mine is a W1VD kilowatt deck: http://w1vd.com/137-500-KWRev3.0.pdf It has blown FETs several times. The problem always occurs at the end of the RF envelope. To further confuse this issue, I have lost only one FET while running with my U3S exciter in hundreds of hours of operation. I have lost many FETs when driving it with HF transceiver and down converter. I have also lost FETs driving it with a phasing exciter. It seems using it with either of the latter exciters almost guarantees one or more dead FETs within a few minutes. I was running at about 300 watts output during all of these failures. 73, Paul On 2/24/19 8:42 AM, Eric NO3M wrote: > The driver and FET gates in mine are AC coupled (0.22u, SB560 > schottky shunt, 10 ohm series, 4.7k shunt) and the problem still > exists.  Apparently same thing Paul N1BUG was having problems with.  > The spike on the end of the RF envelope is what seems most ominous > and results in my 48v switcher going into fault mode.