Abstract: Systems and methods for locating re-access points along an underground conductor wherein tuned passive marker elements are disposed adjacent and alongside the conductor at the re-access points, a transmitted signal is coupled to the conductor to create a field about same such that a receiver that is swung to and fro laterally of the conductor by an operator traversing same will normally have a peak-null-peak output, but as a marker is approached the receiver will have a peak output in the normally null region due to a field generated by the passive marker element, thus permitting the location of the passive marker element to be precisely determined.

Abstract: Improved method and apparatus for measuring the capacitance of telephone cable pairs utilizes the technique of charging and discharging the cable pair being measured to respective predetermined voltage levels and integrating the discharge current while observing certain specified parameter requirements. This technique provides an output which is a linear function of the capacitance of the cable pair being measured and has the property of substantially infinite rejection of a predetermined (interference) frequency and its harmonics, and yet permits the apparatus to have requisite simplicity and economy.