A phase compensated switched attenuation device 6 is provided for attenuating high frequency signals while maintaining an insertion loss of less than 1 dB up to 3 GHz. The spacing between adjacent active regions is maintained at the minimum line width. In the first irregularity, columns of pockets, typically associated with flutes, are staggered circumferentially out of even spacing. The pickets include upper edge portions that form a conveying surface for supporting and advancing the object to be portioned. The mechanism includes removable or changeable wheels to transport the mechanism with or without a door.