A TV transmission tower antenna is at a height of 20 m. How much service area can it cover if the receiving antenna is
(i) at ground level,
(ii) at a height of 25 m?
Calculate the percentage increase in area covered in case (i) relative to case.

The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be \({ f }_{ max }=9\left( { N }_{ max } \right) ^{ 1/2 }\), where N _max is the maximum electron density at that layer of the ionosphere. On a certain day it is observed that signals of frequencies higher than 5 MHz are not received by reflection from the F₁ layer of the ionosphere while signals of frequencies higher than 8 MHz are not received by reflection from the F₂ layer of the ionosphere. Estimate the maximum electron densities of the F₁ and F₂ layers on that day.

On radiating (sending out) an AM modulated signal, the total radiated power is due to the energy carried by \({ \omega }_{ c },{ \omega }_{ c }-{ \omega }_{ m }\) and Suggest ways to minimize the cost of radiation without compromising on information.

A communication satellite is essentially a repeater station in space." Justify the statement by analysing the function of a repeater.

What is space wave communication? Write the range of frequenices suitable for space wave communication.