A new artificial cable kit

The artificial cable kit (ACK) comprises networks equivalent to definite lengths of cable, and loading coils. Each network is a lattice modified by shunt arms simulating capacitance-to-ground. Overall tolerance in impedance and propagation is held to ±2% from nominal real cable between 10 and 7,000 cps (cycles per second) by novel network design and by limiting the tolerances in network components; as intended, uniformity of performance, both loaded and nonloaded, is superior to that of real cable. Also important is a first approximation to the longitudinal circuit for signaling purposes. With ladder-type networks, equal results could be achieved only by using more components.