Audio and measuring facilities for the CBS international broadcast stations
14 November 1943
Terminating equipment for the audio link between studio and transmitter is described. This includes means for selecting any 1 of 3 incoming programmes, frequency-correcting circuits and equalizers, and variable band-pass filters. Monitoring apparatus, both audible and visual, is provided, together with instruments for measuring noise and harmonic distortion. Provision is also made for recording all outgoing programmes, using plastic discs each capable of 1 hr. running.