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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Provags-ID: V03:K1:LP5px6obSxoMBl9Z3D59cY6sQGh11KR483JjC3dZ+f9LgemhKB1 GSqX1fn0zfDUi8cigYS3ItcoCK0Rt4l5pfi8T2WIoybUw9WdD1QWEhR0Ut82B6p4m3TNacs CDU6axA1RE4eLrQNkDu/MJoKY8W2GjwTrue7OGZ2POfSbRls/gl3Q5HsII1kwVZ0e5wnQ9W KhhK7Z1shxweU0sMDspCg== X-UI-Out-Filterresults: notjunk:1;V01:K0:4hkx31d+dTQ=:Agizhb15xOW/8KDKscH8Eh /vWQKY72uY2tnPsdeRdRKbolGSDUKnF/s3tfTD4OhJ/Y+CE/JpNWyQuDLQzlVGnFAh35vozEC UluIASo1kLdxWCAorrBo9A+3hc9siquHGnUHIQG0Z3mEmWEI4NWSnGgn1qMAWgQK/ZXZ8jUSY qSuONRtiSlSiB1PxP8giGDibjuiPmpWG5KMZeNeoJ3Z6Dql1zEVW/iAbTzyQLmmw7rJjGzXY/ iQ9U6TfyD1ISveQp3xY17obSKzJ0HtHOI0zOTPeSf+cqRyXU72alm69UZWotO6nEqxhMiLwVJ Rpg9akOTG4Ddw8NLnTzVqKJxrQ7YfAz7qeAPrcOELTcjLkd0tReHW/k0dmePLBrvuZpkk/oXh nURv6sY5JGrG0npfonnt0azXaG08x28oUhsDnVoEba8O/tb3n35VX4nqSUa9XoQMI5JhZNJe0 dNmjyhLJtxbTyAbjL9paeUbSTga66lhwecC9wvhh1twu9QwVqm3cA/BpVwVRmGOPSnb0DY5Vu /jI8PcFIaZF6c88quAKwHAmSnXOXX4myzi7hos5jEdgxnMbNuDmYx331p93zKYQWrASE2yWG5 Oa1n61zEJaGbAwQSumSiqKc6xOz/n+0b06Aq2tPcSQbnY8Ya8tCHFICKNaRR/8xUh+AO/Vf+T qaX/HKmpcdhpwN+kbc4QfxTqjU42HzCNghVIkzkoK7pH7m3e2o4kiKAAp4huVU2hRjkME7G/i 59/vYlzKGx8jAErpYN7MO2t6hHeikDrC2IjKz0oy1XWO9iQE5m0LqpHkQ1M= X-Spam-Score: 0.7 (/) 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: Thanks Hugh and everyone else who commented and provided tips on my earlier post about this amplifier. I will wait for Jay to have a chance to comment but I *think* I'm OK on timing of the phase transitions. However, something is causing major ringing (is that the correct term?) on the drains. I believe I need to find the cause and do something about that but I have no idea what to look at. [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.6 URIBL_SBL Contains an URL's NS IP listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] 0.1 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] X-Scan-Signature: b8b011f938af8abc4b241335cabd0691 Subject: Re: LF: W1VD amp help - more waveforms 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 Thanks Hugh and everyone else who commented and provided tips on my earlier post about this amplifier. I will wait for Jay to have a chance to comment but I *think* I'm OK on timing of the phase transitions. However, something is causing major ringing (is that the correct term?) on the drains. I believe I need to find the cause and do something about that but I have no idea what to look at. I've been building and even designing QRO amplifiers for 35 years but I'm a vacuum tube HF/VHF/UHF guy! This FET class D/E stuff is all new to me and I don't learn new tricks as easily as I once did. :) Paul On 04/09/2018 06:08 AM, dhchurch wrote: > Hello Paul >   > You can also introduce a small delay for each extra > semiconductor junction in the driver path, some inverters are quite > good for this. Obviously the gate waveform should be steep not > overly so. >   > Hugh, M0DSZ > > ----- Receiving the following content ----- > *From:* N1BUG > *Receiver:* rsgb_lf_group > *Time:* 2018-04-08, 17:59:10 > *Subject:* Re: LF: W1VD amp help - more waveforms > > > Always start out on the dummy load. Test in stages.　Test the > driver > > into the FETs with the FET drain supply off. Verify the waveforms > > with a dual trace scope to see that there's　a small　'dead zone' > > between the two phases. This prevents the possibility of　cross > > conduction. Once the gate waveforms are　confirmed　to be correct, > > turn on the FET drain supply. Once the amplifier is verified to be > > working properly add the doubler. > > Waveforms... > > Conditions for all below: Drive is from the HP 3325B at 2Fo, 5V > square wave, 2.5V DC offset fed into amp driver board. Amp output > through LPF into a quality dummy load (250W 50 ohm flange load > resistor known good through UHF). > > No drain voltage... > > Gates: > > http://www.n1bug.com/gates1.jpg > > http://www.n1bug.com/gates2.jpg > > > > > Now with 13V on the drains... > > Gates: > > http://www.n1bug.com/gates1-wdv13.jpg > > http://www.n1bug.com/gates2-wdv13.jpg > > Notice those have changed a bit with the addition of drain voltage. > > > Drains: > > http://www.n1bug.com/drains1-wdv13.jpg > > http://www.n1bug.com/drains2-wdv13.jpg > > It looks like one phase is "mostly" off before the other is fully > on, but I'm not sure if this is as much dead zone as I should see? > One is still going down while the other is starting to come up. In > any case the drain waveforms don't look good! Suggestions on where > to begin looking for the cause of this? > > Paul