- 1 What is ground wave propagation?
- 2 Where ground wave propagation is used?
- 3 How does Earth affect ground wave propagation?
- 4 How do we benefit from Ground wave Sky wave and space wave?
- 5 What are the types of ground waves?
- 6 How do ground waves work?
- 7 How do we benefit from the Ground Wave?
- 8 What is a ground wave when is it used for communication?
- 9 What is the range of ground wave propagation?
- 10 Why should ground waves be vertically polarized?
- 11 What is the effect of earth curvature on radio wave propagation?
- 12 Which polarization is required in ground wave propagation?
- 13 What do you mean by ground wave?
- 14 What are the difference between space waves and surface waves?
- 15 Why ground waves are not suitable for high frequency?
What is ground wave propagation?
Ground wave propagation is a type of radio propagation which is also known as a surface wave. These waves propagate over the earth’s surface in low and medium frequencies. These are mainly used for transmission between the surface of the earth and the ionosphere. These are made up of the number of constituent waves.
Where ground wave propagation is used?
These are made up of the number of constituent waves. These waves are propagating over the earth’s surface in low and medium frequencies. The main use of ground wave propagation is the transmission between the surface of the earth and the ionosphere.
How does Earth affect ground wave propagation?
Effect of frequency on ground wave propagation As the wavefront of the ground wave travels along the Earth’s surface it is attenuated. The degree of attenuation is dependent upon a variety of factors. Frequency of the radio signal is one of the major determining factor as losses rise with increasing frequency.
How do we benefit from Ground wave Sky wave and space wave?
Answer. The ground wave can propagate a considerable distance over the earth’s surface particularly in the low frequency and medium frequency portion of the radio spectrum. Ground wave radio signal propagation is ideal for relatively short distance propagation on these frequencies during the daytime.
What are the types of ground waves?
The two main types of waves are body waves and surface waves. Body waves can travel through the earth’s inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves.
How do ground waves work?
Ground propagation works because lower-frequency waves are more strongly diffracted around obstacles due to their long wavelengths, allowing them to follow the Earth’s curvature. Ground waves propagate in vertical polarization, with their magnetic field horizontal and electric field (close to ) vertical.
How do we benefit from the Ground Wave?
Advantages of Ground wave ➨As it uses lower frequencies, interference occurs due to atmospheric noise only. Moreover absorption of EM waves at lower frequencies are less. Hence it can cover longer distances. However the pathloss increases as distance from transmitter increases.
What is a ground wave when is it used for communication?
Figure 148. The GROUND WAVE is used for SHORT-RANGE COMMUNICATION at high frequencies with low power, and for LONG-RANGE COMMUNICATION at low frequencies and very high power. Day-time reception from most commercial stations is carried by the ground wave.
What is the range of ground wave propagation?
The ground wave is the preferred propagation type for long distance communication using frequencies below 3 MHz (the earth behaves as a conductor for all frequencies below 5 MHz). The ground wave is also used for short distance communications using frequencies between 3 and 30 MHz.
Why should ground waves be vertically polarized?
As a surface wave passes over the ground, the wave induces a voltage in the Earth. To reduce the attenuation, the amount of induced voltage must be reduced. This is done by using vertically polarized waves that minimize the extent to which the electric field of the wave is in contact with the Earth.
What is the effect of earth curvature on radio wave propagation?
curvature of earth. Due to this horizontal component of electric field get shorted, which reduces strength of electric field. Ground Wave Propagation (Contd.) include radiated energy that travels in the lower few miles of the earth’s atmosphere.
Which polarization is required in ground wave propagation?
Medium wave broadcasting: Medium wave broadcast stations generally use vertical polarisation because ground wave propagation over the earth is considerably better using vertical polarization, whereas horizontal polarization shows a marginal improvement for long distance communications using the ionosphere.
What do you mean by ground wave?
: a radio wave that is propagated along the surface of the earth.
What are the difference between space waves and surface waves?
Body waves travel through the interior of the Earth. On the other hand, surface waves propagate only at the interface between two different media, like the interface between Earth and atmosphere (i.e. the surface of the Earth).
Why ground waves are not suitable for high frequency?
As ionosphere only reflects wave of frequency lesser than ( 30;MHz). Therefore, the ground waves are not useful for higher frequencies as the degree of attenuation is directly proportional to the frequency of the ground waves. Hence, ground wave propagation is not suitable for high frequency.