An electronic delay modulator

An electronic delay modulator that operates by scanning a fixed multitap delay line has been devised, and an experimental model has been built and tested. The device is ultimately capable of delay-variation-times-signal-bandwidth products as high as 11, with minimal amplitude modulation and good modulation linearity. The frequency at which delay can be modulated is limited only by the speed of the scanning circuit and not by the reciprocal of the mean delay, as in conventional delay modulators which vary the propagation time of an entire line. The behavior of an experimental device of this type is described and applications are suggested.