Problems with Inverse laplace and step function

Hello,

I make an calculation of an antenna circuit. For this I have to use the step function. When I want to

make the inverselaplace function to my equation, it will not be work.

I think this will not be work, because I think that matcad will calculate values from t<0. But I want to

analyse only values which are t >= 0.

Can I give mathcad the information, that it calculate only with values t>0

Please look to the matcad file, where I have made also a lot of comments on page 4.

The pages before is normally not relevant for you.

Thanks a lot

Regards

Roger