Proceedings of the Conference of the Indonesia Astronomy and Astrophysics, 29-31 October 2009 Premadi et al., Eds. c  HAI 2010 Development of Radio Astronomy at the Bosscha Observatory T. Hidayat 1 , M. Irfan 1 , B. Dermawan 1 , A. B. Suksmono 2 , P. Mahasena 1 , and D. Herdiwijaya 1 1 Bosscha Observatory and Astronomy Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia email: taufiq@as.itb.ac.id 2 School of Electrical Engineering and Informatics, Institut Teknologi Bandung, Indonesia Abstract. Radio telescopes for research and education are currently in phase of development at the Bosscha Observatory. A small parabolic radio telescope with diameter of 2.3 m working at 1420 MHz is already available for general purpose of radio astronomical observations. In addition, a Radio Jove telescope with dual dipole antenna working at 20 MHz is also available. It is suitable to monitor daily solar burst as well as Jupiter decametric emission. Moreover, ‘ATLCP’ multi- element radio interferometers are now under construction. It consists of non-tracking Radio Jove array as well as two-dimensional tracking interferometer. The latter is planned to utilize up to 5 antennas. Design and sensitivity of the interferometers will be presented. Multi frequency receivers are made available at 20, 406, 1420, and 1665 MHz. The latter will be used for VLBI in the near future. Keywords. radio astronomy, interferometer 1. Introduction Recently, Bosscha Observatory prepares to be a multiwavelength observatory as a long term project (Hidayat et al. (2009)). Considering present situation and location of the observatory, radio astronomy is naturally a first option to complement our classical optical programs. Besides its scientific importances, radio astronomy augments science education broadly and serves to promote interdisciplinary research and education (Pratap & Salah (2001)). This project comprises in one part to build ‘prototype’ of low-cost radio telescopes with which one may work on radio astronomical techniques and instrument calibration. Sub- sequently, we develope further to aperture synthesis arrays for synthesis imaging which is a primary tool in modern radio astronomy. It is well known that synthesis imaging in radio astronomy has a rich history of mathematical, scientific, as well as technological advances and discoveries. In other part, this project can also be introduced to undergrad- uate program to discover the exciting world of radio universe and to encourage research by undergraduates. This paper thus presents the progress in our development of radio astronomy at the Bosscha Observatory. 2. Radio Telescopes As a ‘prototype’ of our first radio instrument, we choose the MIT-Haystack Small Radio Telescope which provides all the basic operation of a radio telescope. It consists of a 2.3m parabolic dish with an alt-azimuthal mount controlled by a software written 143