A satellite communication link operates at a frequency of 6 GHz. The transmitting and receiving antennas have gains of 40 dB and 30 dB, respectively. The distance between the satellite and the receiver is 40,000 km. If the transmitter power is 1 kW, calculate the received power, assuming free space propagation. (Take the speed of light as $3 imes 10^8$ m/s)

For sky wave propagation of 10 MHz signal, what should be the minimum electron density in ionosphere?

The closed structure of co-axial cable prevents inner copper wire or core or from radiating signal power. The statement is

A receiver reconstructs the original message after propagation through the channel.

A diode AM detector with the output circuit consisting of $R = 1\;{\rm{kW}}$ and $C = 1\;{\rm{\mu F}}$ would be more suitable for detecting a carrier signal of

The highest frequency of radiowaves which when sent at some angle towards the ionosphere, gets reflected from that and returns to the earth is called

The difference in the refractive index of the fiber core and fiber cladding in step-index fibers is typically

The process of recovering the message signal from the modulated carrier wave is known as:

The modulation index of a FM signal is 0.25. If modulating frequency is 2kHz, the maximum derivative in frequency would be

Ozone layer above earth's atmosphere will not

Which of the following is not the main characteristic of laser beam?