Atmospheric radars spread over the radio frequencies bands ranging from VHF to W band are used to study the clear air phenomenon in troposphere and stratosphere, precipitation measurement, thunderstorms and gust front detection and radio wave propagation studies in the ionosphere. Among these Stratosphere Troposphere (ST) Radar is all weather vertically pointing pulse Doppler VHF radar provides information about the vertical profiles of zonal, meridional and vertical wind components in the atmosphere with very high temporal resolutions. Further, these radars are quite instrumental and can be utilized for understanding the wide range of complex atmospheric processes such as atmospheric turbulence, refractive index structure, convective processes, terminal velocities, gravity waves, determination of Tropopause height, Stratosphere Troposphere Exchange processes etc. For better understanding of intriguing dynamical and meteorological aspects of the atmosphere over this high altitude sub-tropical region, a ST radar facility operating at VHF frequency of 206.5 MHz has been set up at ARIES, Nainital (29.4oN; 79.2oE; 1790m amsl). This seminar will be mainly focussed on discussing the various subsystems of radar, radar technique, basic theory for high power VHF radar backscatter mechanisms, signal and data processing method for the parameters retrieval . A glimpse of the results obtained from initial operation of ARIES ST radar (ASTRAD) will also be presented and will be discussed in the light of current understanding of the atmospheric dynamics over Himalayan region.