The techniques and instruments employed for receiving galactic radio signal at 1420 MHz at a tropical station Kalyani are described. The purpose and background of this type of observation and some early attempts for developing similar receiving equipments have first outlined. Some interesting characteristics obtained from the continuum observations as well as the spectrum observations are reported. An Interstellar Search System (ISS) is exceptionally vulnerable to interference by manmade coherent radiations and as a matter of fact the terrestrial radio spectrum is largely crowded. For this reason an extensive strategy is very much essential to hold interference up to a reasonable level. The terrestrial origin of an interfering signal can perhaps be recognized to a high level of certainty by making use of a properly operated ISS. A simultaneous study is essential to find the degree of using the ISS frequencies particularly where the signals are kept close to the surface of the Earth. In fact, any interstellar searching system is compatible with a large use of the same frequency band when its use is confined to the surfaceof the Earth. It may be pointed out that the present use of 1400 MHz to 1727 MHz band is more or less compatible with the operation of an ISS, in contrast to bands below 1400 MHz and above 1727 MHz, where powerful aircraft acquisition