NRAO interferometer electronics

The NRAO interferometer is instrumented to receive and process both right- and left-hand circularly polarized signals at 3.7- and 11.1-cm wavelengths. Some of the design considerations and a description of the electronics, including tabular listings of components used to instrument the antennas as an interferometer, are included. The maximum amplitude and phase changes in the interferometer outputs caused by the instrumentation are analyzed and determined to be 5-percent amplitude change and 0.04-rad phase change in the 3.7-cm interferometer outputs over a 4-h interval.