A correlation interferometer of the phase-switching type operating at a frequency of 103 MHz, developed for interplanetary scintillation (IPS) observations, is described. Two outputs, sin and cos, of the correlation receiver give rapidly changing voltage fluctuations produced by a compact scintillating radio source. A scintillometer output, proportional to the square of the scintillating flux, enables measurement of scintillation index. More than 100 strong and weak scintillating sources have been observed. This is the first of the three IPS radio telescopes being developed in India for studying the interplanetary medium.
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