A method for pen drop weight calibration includes altering an image prior to printing based on the difference in printing performance of a first pen and a second pen to produce altered image data, the first pen and the second pen being disposed in the same printer. The catch member defines a gap which has a width that is reducible when the catch member moves from a non-catching position to a catching position and that is expandable when the catch member moves from the catching position to the non-catching position. An endless track of each track assembly is trained around a framework having a drive sprocket and sets of idler wheels. One or more computer processors can be also be provided onboard the spacecraft. Therefore, the coupling coefficient is lowered by adjusting the inductance of the \u03c0-type inductors, avoid noise generation, and obtain optimal band pass characteristics, while miniaturizing the filter.