A stabilized cross-correlation radiometer

A new type of correlation radiometer has been built for use at decametric wavelengths by the University of Maryland´s Clark Lake Radio Observatory, Borrego, Calif. The primary function of this system is to cross-correlate the signals between two sections of the Clark Lake array. The correlated signals are measured by a receiver using two feedback loops which control four noise diodes. Each feedback loop is similar to a Ryle-Vonberg receiver. The system is insensitive to amplifier gain changes, and to small changes in relative phase shift between amplifiers. An additional advantage for radio astronomy is that a linear power response is obtained, regardless of the receiver detector law.