Tony and JZ,
What transformer model are you using in the LTSpice sim of the PA? WTST of RWTST? That is a picture of your .asc?
73
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On 23 Sep 2023, at 06:59, HA3HZ <gyula@...> wrote:
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I have run it, Tony, but it is still too early to say much. Two of these seem to produce a bit more output power than 4 BS170 in a 20m sim, but the drain currents I see are transitioning sharply and ringing wildly. I will play more with it later.
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JZ
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In connection with another experiment, I noticed F5NPV Didier's experiences. Didier applied ES5DOL's suggestion to a Fetes power stage.
He inserted a 0.1...1Ohm and a 220nF capacitor parallel to it between the FET Source and the ground.
With this solution, you replaced the RC elements between Gate and Drain. The latter are meant to stop the ringing.
Perhaps it would be worth looking at this possibility here as well.
Just a small suggestion.
--
Gyula HA3HZ
