A static mixer for mixing components of liquid reactive multicomponent compounds includes a jacket having a mixing section. An estimate or measurement of the rate of change of a pilot’s PN phase offset is used to assist in making CDMA call processing decisions. A second development difference of potential of the first polarity at the second development station forms a second net development difference of the second development difference of potential less any image modulated difference of potential at the individual engine pixel location and less any difference of potential relative to ground of any first toner at the individual engine pixel location.