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Explain mechanisms of propagation of radio communication.
Radio communication deals with electronic radiation of electromagnetic energy from one point to another through atmosphere or free space. It is possible only in a certain position ofelectromagnetic frequency spectrum. Currently, this portion includes frequencies from 9 kHz to 400 GHz.whereas there are international allocations for the radio spectrum up to 275 GHz, most of the commercial uses occur between 100 kHz and 20 GHz. Very few experimental systems have been operated beyond 100 GHz.
Different layers of atmosphere play a role in propagating radio waves. Atmosphere comprises four layers. Of the four layers, ionosphere and troposphere are useful for radio communication in certain frequency ranges. Many other radio frequencies pass straight through atmosphere and can be beamed towards satellites placed in interplanetary space
a short review article on the classification of time frame
Energy band: the energy band picture for Ii an- type, and Iii ap - type semiconductor Indicate the position for, the donor and acceptor levels. Sol.(a)
Calculate Voltage and Current Phasors on a Phasor Diagram A synchronous motor is operated at rated load and unity power factor. The field current is increased by 20%. Show the
Q. Determine the voltages V x using voltage division and equivalent resistor reductions for the circuits shown in Figure.
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At what value of electric field at a junction does zener breakdown takes place
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Q. explain the architecture of SS7 and compare with seven-layer OSI architecture. Ans: A block schematic diagram of CCITT no. 7 signalling system is displayed in figure. Sig
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p type material: p type material is formed by doping aerial crystal with impurity atoms having three valance electrons. The diffused impurities with three valence electrons
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