Spectrum generator for transmission testing of wire facilities

Transmission measurements usually are made by the relatively slow point-by-point method. Swept-frequency techniques are quicker, but may interfere with the transmission system´s normal operation. A Spectrum Generator is described which simultaneously supplies a number of uniformly spaced test tones within the carrier facilities´ frequency range. A manually tuned or sweeping selective detector, used as a receiver, will yield the system´s transmission characteristics. By this method, the speed of the swept-frequency method is attained without its disadvantages.