• Sreenath Nair
• Dr. P. D. Lele

In a real multi frequency radio wave absorption experiment, very high power (30 kilo watts) radio wave pulses are transmitted vertically up and their echoes are received on the ground. The ionosphere height ranges from 60 km to 600 km. The amplitude of the echo received corresponds to absorption loss of 3 dB to 60 dB. This requires huge antennas and associated power amplifiers. It will also require very low noise and highly sensitive radio receivers. The Physics Department, Gujarat University had German equipment and the author has made absorption measurements during 1984-1985. It is not possible in a UG or PG laboratory to do this experiment. Therefore, we have fabricated a simple experiment using timer IC 555 as astable and monostable multi vibrators to simulate above experiment. We have used 8 channel analog switching IC 4051 and 4 bit counter IC 4029 for multiplexing and de-multiplexing circuits to simulate 8 channel multi frequency radio wave absorption experiment. This simulation hardware experiment is akin to RADAR in all the details. In fact real experiment is called ground based radio sounding of the ionosphere from bottom side. Similar to this there are airplane borne and satellite borne topside ionosphere radio sounding experiments.

Radio Wave , Absorption , simulation , radar , ionosphere

"Hardware Simulation Experiment to Study Radio wave Absorption by Ionosphere", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 8, page no.369-372, August-2018, Available :http://www.jetir.org/papers/JETIR1808048.pdf

"Hardware Simulation Experiment to Study Radio wave Absorption by Ionosphere", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 8, page no. pp369-372, August-2018, Available at : http://www.jetir.org/papers/JETIR1808048.pdf