Spline sketch spears segmented (instead of smooth) when I save a drawing as PDF.

I have a Drawing which includes a sketch of a spline.

the sketch was created using offset entities from an existing line (part of the model).

in the drawing the spline apears smooth but when I save the drawing as PDF it comes out segmented and ugly....

I tried the save as pdf options but they are on 600 DPI...

Help anyone?

SolidworksDrawings And Detailing