Wojtek, the scope photos were very helpful.
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That transformer is supposed to Step UP the voltage, not down.? ?So something is terribly wrong, and it appears tht bothof your FETs are doing fine.
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You can divide the system in half and help to figure out where the real problem is, by lifting the Orange wire that goes to the CAPACITORS and send it instead to a 50 ohm dummy load of suitable power handling capacity.? ?Then measure the voltage or power in that line.? ?Of course it will have sizeable HARMONICS so you dont' want to send it to an antenna, but sending it to a dummy load will allow you to check that the transformer is still working properly.? ?You should get PLENTY of power out of the orange wire.? ??
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Assuming you DO get power out of the Orange wire -- then the problem is in the LPF system; something is indeed shorting out your power.
If you do NOT get power out of the Orange wire -- then there is something wrong with the transformer.? ?I didn't see enough in your tofigure it out.? ?It should have two brass rods that are probably soldered together on one side and not on the other, but I'm not able to see mine and not exactly sure how they are assembled.
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Splitting the system into? ?MOSFETS+TRANSFORMER? one one side and? LO PASS FILTERS out of the question will help you figure otu where the problem lies.
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73
Gordon KX4Z
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