Re: gEDA-user: Spice Transmission Line Simulation Question

[Wojciech Kazubski <wk@xxxxxxxxxxxxx>]

> I am using Spice 3f5, attempting to model a coax line.  I am a nubie
> at this.  The lossless example uses two lines to model one coax.  Do I
> need to do this with the ltra model?  It does not seem to make a
> difference.
>
> I get funny results.  I use
>
> ac dec 100 1 1000meg
> plot db(v(4)/v(2))
>
> I see what I expect up to about 18mHz and then it oscillates.
>
> What am I doing wrong?

You can try to use qucs instead of spice. This is a real RF/microwave 
simulator. I also had problems with simulating transmission lines in spice.

Wojciech Kazubski


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