NR BR 1848 ISSUE 1 PDF

GENERAL

This specification covers the supply of longitudinal induotors for Insertion between the cable line and the equipment to improve the signal to noise ratio.

This longitudinal choke is a double wound ferite cored inductor, the two coils being identical.

The choke is inserted into the circuit in such a way that the fluxes from the two coils, due to the normal loop currents are equal, and in the opposite sense; the choke is therefore non-inductive to loop currents.

The fluxes from each coil produced by longitudinal currents are in the same sense, the choke is therefore inductive to longitudinal currents and presents a higher impedance to such currents.