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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
Q. With a neat circuit diagram explain the working of a Hartley oscillator using an npn transistor and obtain the expression for oscillation frequency and for minimum gain for sust
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Ac power has significant practical advantages over dc power in generation, transmission, and distribution. One major drawback of the single-phase circuit is the oscillatory nature
Unconditional Jump JMP ( Unconditional Jump ) Instruction: This instruction is used to transfer the execution to the specified memory address unconditionally ( does not c
what is counter
Q. Can you show the Decimal to Octal Conversion? To convert decimal to octal is somewhat more difficult. The usual method to convert from decimal to octal is repeated division
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Diac Diac is a device which has di electrode and as its name suggests it works on AC. The cross sectional view of a diac is shown if the four layers are PNPN and PNPN .
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