Yu.V. Vekshin – Master, Junior Research Scientist, Institute of Applied Astronomy RAS (Saint Petersburg) E-mail: yv.vekshin@iaaras.ru

V.O. Ken – Junior Research Scientist, Institute of Applied Astronomy RAS (Saint Petersburg) E-mail: ken@iaaras.ru

E.Yu. Khvostov – Research Scientist, Institute of Applied Astronomy RAS (Saint Petersburg) E-mail: hey@iaaras.ru

A.P. Lavrov – Dr.Sc.(Phys.-Math.), Senior Research Scientist, Professor, Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University E-mail: lavrov_ap@spbstu.ru

The two element very long baseline radiointerferometer based on the RT-13 radio telescopes of the Russian network «Quasar» is implemented for the Universal Time determination. In order to determine the instrumental errors of the receiving and recording equipment of the RT-13, which affect the accuracy of the Universal Time corrections, the laboratory model of a radio interferometer with zero-baseline was created at Institute of Applied Astronomy of the Russian Academy of Sciences. The model consists of two tri-band (S, X, Ka) heterodyne type receivers, broadband (512 MHz) data acquisition system (as back-end unit) and software RASFX correlator. The results of receiver delay stability measured by R&S vector network analyzer, data acquisition system, and the radiointerferometer model total delay stability, calculated using the correlator’s responses, are shown in this paper.

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