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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Language: en-US X-Provags-ID: V03:K1:u47EyhXV0r6jn3d9KVtP6Re0KA7iKeLD+PLLiZWzaSYQ0u2uihC 1vg+wrRgF3mjWkRxnbDGAVUwkViti2uD90RqsWRt5gsCdUB1vwsxdOQDxBs5NbJQZbpeNz2 iAhSa4+ovhC28dw1Sftvp/t4iSED2lTPPMohXHjgz+z0Dl7+PWomAW7DddyaPO7aOMzOsn2 3wU4jntkZoKFVbljhhYCw== X-UI-Out-Filterresults: notjunk:1;V01:K0:22uWQyxUJ14=:OfkeIS64FDe43JyBJp6FsZ mrolYsxzp1A/PP5pASisuvpYyvs1QCFVNbj/FRTEvOpacchKZ6lYt6ly2nUG1VGBG6yu1CU+d vND//7Tk/LipRfzUUgo/cUEbn/u2wSrX5ghy2RvTLkfwxvhCsQr2V+TaYgy41bJIdGZ4t89az EuTmLaDhaANcEJRd7UOCV1qo/kCEvqwwCjiL+Rkzyrg1Xf5J9hHfsWpQOYq8H0bfnI38HT5M6 rq2M3rjYcTbNizVNPamfYBRWTruf7Hc7EXD0nh5IU0FEsxBqoyACDwH8V61UuPHjuELZLTTBS EnfEIvBPxhJS/Aaiyq/g3xyfTHa8AWjkcoootcPNTizBj9D+kDOlc8EWOi02glQRgoCXKe68m KUhMi0/WO0HamjcJofLSUotGUx/llZI3homE+RnJfmwsOk1obTICjyE3zFNo5u1u+OetG2rnO gF3ZuMBHnQy5r7CefhscR09qc0PNp2DKRyt/YUVfs1kpAUqEK7KBQJZ2NHSpuUEK0J80ZBHHY W3/+ZCHWVg3KdDUu904g9Y0ggsbr56jMbATGmvvznpdgacYyLZQivU6ay8SxPDh2D2x2FMdwb dmxbZWTUt4Sr9mzzehp0IfeYmdE5XJIPDZ3/QSCwa5VHutxiO8jGADNfWjQFEtxBT+3kDjkYq Pf/OZ6GiuwAPYjbyOzV/GAtAHtCQnVPavTP6pUMaF8SJzu9C9eS8fkG+LATeYPzqMyudrwQNJ 3joahf4Cd0V98Btaw8uZeaO9RkmmiZcvzaWCrqmjRGr/suVXKU5WBstqcMw= 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: It seems I'm in over my head again. I'm having difficulty getting my newly built W1VD kW 137 amp to run correctly. I think the problem may be with my driver board. Question 1: Could anyone with a known good W1VD kW deck send me a scope plot of your gate waveform please? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: 33d261536bb1467bb13d5764461d5ec4 Subject: LF: W1VD amp help 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=3.0 required=5.0 tests=SUSPICIOUS_RECIPS 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 It seems I'm in over my head again. I'm having difficulty getting my newly built W1VD kW 137 amp to run correctly. I think the problem may be with my driver board. Question 1: Could anyone with a known good W1VD kW deck send me a scope plot of your gate waveform please? Question 2: Using the driver circuit exactly as shown here http://w1vd.com/137-500-KWRev3.0.pdf what have you successfully driven it with? Please specify sine or square wave and drive level. Here are the problems I'm having: Using the configuration shown in the pdf schematic above my amp will not drive with either sine or square wave input at any level up to +23 dBm from a HP 3325B at X2 frequency (275 kHz). When I add this X2 multiplier http://w1vd.com/X2LinearClassDinterface2.pdf between the 3325B and the amp, it works. Sort of. I changed the 3325B to 137.5 kHz of course. I get about 65W with 13V on the drains and 250W at 25V. But, something goes into oscillation when RF drive is removed! Not the FETs. It's either the driver board or the multiplier or the combination of the two. I can see it oscillating when I probe the input to the driver board. Oscillation starts only after RF drive has been present and then removed. Neither the multiplier nor the driver board show evidence of oscillation when not connected to each other. I may have additional issues at high power but I think I should get the driver working correctly before proceeding further. 73, Paul N1BUG