Lining up broadcasting circuits

The C.C.I. have recently proposed a method for lining up wire circuits used for broadcasting purposes which demands that constant voltage at the input to the studio line shall produce constant voltage across the input to the receiving amplifier, assuming this to be 600 ohms in impedance. The author suggests an alternative system based on the use of constant e.m.f. The proposal is that with constant e.m.f. sent from the studio (i.e., constant voltage in series with an impedance equal to the output impedance of the studio amplifier) the circuit shall be so equalised that the open-circuit voltage measured at the output of the first repeater (i.e., the e.m.f. in the output of the first repeater) shall be constant. The author makes further similar proposals for repeater sections, etc. It is claimed that the feature of the constant e.m.f. system proposed is that it allows for the usually rather large variations of the line impedance with frequency which are not catered for on the C.C.I. constant-voltage basis.