Evan,
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My guess is that this thread is looking at RF amps in general, and how to evaluate the voltages and currents that might blow the finals.
Curious, on revisiting that uBitx amp, it looks like a current mode topology, which would expect the LPF to short harmonics to ground.
I don't think the LPF's on the uBitx do that.
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The post you pointed to has a bad link to the LTSpice schematic pdf, that was corrected a few posts later in the thead:
The schematic for the uBitx is here:
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Jerry
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On Mon, Mar 24, 2025 at 10:56 AM, Evan Hand wrote:
Jerry,
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Are we looking at the IRF510-based 50-watt class C amp or the PA of the Q_X series? I believe you have a uBiTx IRF510 simulation that might also be relevant. The output is not the TCVM used in the QRP-Labs 50-watt amp.
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?I have attached that simulation to the post.
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73
Evan
AC9TU
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