Question

The height of a transmitting antenna is 200 m. Radius of earth is 6.4 × 10⁶ m

1. Which one of the following is used in TV transmission?

• Sky wave
• Space wave
• Ground wave
• None of these

2. Find the range up to which the above antenna gives transmission signal.

3. Why is it necessary to use satellite for long distance transmission?

Answer 1

1. Space wave

2. d_m = \(\sqrt{2Rh}\)

d_m = \(\sqrt{2\times6.4\times10^6\times200}m\)

3. Space waves can not be reflected back by iono sphere. Space wave can be reflected back to earth by making use of artificial satellite.