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It's a pretty simple reason, which looks obvious after you realize it. Your signal source has a 1 (volt) amplitude and 50 ohm source impedance.? It is a Thevenin source, so you've got 1 volt behind

Even better:? Why not read the group's guidelines on the main group webpage. You attempted to paste your schematic file into the message.? Never paste or attach any files into a group message. Andy

Am designing a low pass filter for the 20m amateur band, code below. (My apologies if this violates group protocol. Advise and I will adhere in the future.) I note that the display shows this model to

Simply use six instances of your circuit on single page and modify connection\termination for each individual circuits. Yes, it`s not elegant, but works as simple as hammer. Not sure if some kind of

I consider that an odd thing to say. On the one hand, it suggests that his program adds pre-programmed delays which can't be reduced further, without risk of failure. On the other hand, it suggests

Filename is "ptc_sh.zip". It is currently in the Temp ( /g/LTspice/files/Temp ) folder at the group's website. Andy

Yes Andy. Exactly.

Is 1 second what LTspice reports in its .log file?? Or is that from looking at a clock on the wall, from start to finish? If it really takes 1 second to run a simulation, then perhaps that is what it

I have made contact with PyLTspice developer, and he pointed out that It could not be sped up further. Thank you for your attention

Correct. Hmm.? I see some confusion there.? Do you manually write the netlist, or does PyLTSpice write or alter the netlist?? Obviously, if PyLTSpice needs to add .NET commands, it must be writing

1 second is too much for my purposes, and runtime is 1 second whether I use LTspice or PyLTspice? to run the simulaiton

It's OK now, I just uploaded it.

Sorry, I see that the author of PyLTSpice does not know how to spell "LTspice". LTspice has no capital "s".? It is spelled "LTspice". PyLTSpice has a capital "S". Humph. Andy

Help? me understand the problem. <davitkharshiladze26@...> wrote: Is 1 second too much time and that is what you want to reduce? Or is 1 second small, and adding PyLTspice causes the total time

I might be wrong, but I think alan is referring to one of the example schematics that installs on your computer's disk when you install LTspice. ...\examples\Educational\Colpitts.asc Andy

Use the educational examples, oscillators, Colpits and remove the resonating inductor leaving the active device and passive feedback elements in place. Do a scattering parameter operation and note the

LTSpice generates .raw output files, noramlly. I am using PyLTSpice tp prepeare netlist before simulation. I am manually writing the netlist. After simulation, I am gathering .raw files and reading

So -- what files does PyLTspice need to write and read? I still think (from your description) that this is the bottleneck. Andy

No, I am not using .MEAS commands. I tried using some mechanisms that reduced filesize for .raw files, but results remained the same.

As far as I know, file reading and writing are part of the reported simulation time. You might affect that by controlling where it accesses those files, and how big they can be. Andy