Be aware that LTSpice doesn't check for obvious datasheet violations regarding voltage and current.
If you run a 2n3904 at 1kv and 20amps, you get a very nice amp of several kilowatts.
But the simulation does make it easy to monitor such currents and voltages.
Diodes are assumed to be a resistor with a 0.6v forward drop, not as an exponential current vs forward voltage.
You can drop in generic Spice models from other manufacturers to model odd parts.
I set up that PA to use "Transient Analysis", it's as if you were probing the circuit with an oscilloscope.
That's the most natural for most of us, but "AC Analysis" in LTSpice is very powerful and well worth exploring.
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This is the view you get if using a spectrum analyzer and vector network analyzer, instead of that scope.
>? My simulation of the uBitx final from Q90 on out is here:??
/g/BITX20/files/KE7ER/ubitx_pa.ascThat file is ascii text, but you probably don't want to try making sense of it.
Best to just fire up LTSpice and suck that file in, LTSpice will display it as a schematic.
The schematic it shows has been captured as??
/g/BITX20/files/KE7ER/ubitx_pa.pdfJerry, KE7ER
On Thu, Feb 11, 2021 at 10:42 PM, Arv Evans wrote:
It has been a couple of years since I did any LTSpice simulations.? Your post is what got me back to using it.??
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I expect that the simulator will be adequate for evaluating alternative driver devices and circuit laouts for the higher bands.
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Arv
