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Abstract
This paper outlines the new innovative design of an economical Solar Radio Spectrograph site, for studying the transient emissions from the sun in the VHF range. The design avoids the use of the costly servo tracking system and the commercial spectrum analyzer and substitutes them with innovative alternatives. Two dual polarized wide beam-width LPDAs, inclined at an angle of 20° to the zenith, are positioned on the lines running 30° south of east and 30° south of west respectively over two artificial convex surfaces. Their baseline is positioned along the North-South line. The backend of the spectrograph is a spectrum-analyzer card interfaced to a computer, which substitutes the expensive spectrum-analyzer. The antennas are time shared from morning till evening in two equal halves. The solar bursts are displayed online and also saved for future use.
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Notes on contributors
Shubhendu Joardar
Shubhendu Joardar completed his BTech (Electronics Engg) in 1988 from NIT Calicut and MS (Electrical Engg) in 1992 from IIT Madras. He also simultaneously worked as Research Associate in the Department of Physics, IIT Madras. Thereafter he joined the GMRT (Giant Meterwave Radio Telescope), Tata Institute of Fundamental Research as a Scientific Officer. He is a fellow of the Institute of the Electronics and Telecommunication Engineers and his major field of work has been in Microwaves, Antennas, Embedded Systems, Scientific Software, RFI instrumentations and Data Analysis for Radio Astronomy. He is actively engaged in Astronomical research and about to submit his PhD thesis. He has contributed about twenty research papers in various fields. He is also Reviewer of some International journals based on Electromagnetism and Astronomy.