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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: Chris, LF, Yes, although I run mine differently. I use the full output of the U3S into a doubler. I have run WSPR, JT9, and DFCW from the U3S without having any problems. I have also extensively used CW ID with [...] 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 [74.208.4.194 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record X-Scan-Signature: e6de17d69e46ff4ea8db042ef2cd7e46 Subject: Re: LF: 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 Chris, LF, Yes, although I run mine differently. I use the full output of the U3S into a doubler. I have run WSPR, JT9, and DFCW from the U3S without having any problems. I have also extensively used CW ID with the U3S and amp without problems. Yet both other exciters blow FETs at the instant RF stops. Chris, I know you are busy but if you get a chance I would like to see those scope captures. I thought I had it figured out that this is a voltage mode amp and should be seeing current spikes, but maybe I still have that wrong! If they are voltage spikes that may be easier to control. One thing I would like to learn more about is why do the drivers leave one phase high for a longer period than a half cycle when RF stops. What causes this? Is this only with specific FET drivers or are all of them prone to this? 73, Paul On 2/25/19 11:13 AM, Eric NO3M wrote: > Chris, et.al. > > N1BUG relayed the same information regarding the U3S and class-D amp > behavior, so your observation is not a one off... > > > >> >> I have a series of scope captures from my W1VD amp showing huge >> voltage spikes on the FET drains at the end of WSPR and especially >> OPERA TX sequences. I suspected inductance was the cause. In fact I >> try not use OPERA at high power as i am pretty sure to kill a FET >> after a few sessions... Oddly (although I hope msomeone more >> knowlegeable has the answer), using WSPR from my U3S direct from CLK0 >> of th Si535a or whatever it is never causes these spikes... Or at >> least they are well contained.