Why a signal transmitted from a TV tower...

Why a signal transmitted from a TV tower cannot received beyound a certain distance ? Write the expression for the optimum separation separation between the receiving and the transmitting antenna.

Text Solution

Verified by Experts

A signal transmitted from a TV tower cannot be received beyound a centarin distance due to attenuation and curvature of earth. Every antenna has the range. Rahge is the distance between a source and a destination up to which a signal is received with sufficient strength.
Optimum distance between the receiving and transmitting antenna.
`d_(M)=sqrt(2Rh_(T))+sqrt(2Rh_(R))`
` "where R = Radius of earth "`
`h_(T)="Height of transmitting antenna"`
`h_(R)="Height of receiving antenna"`

Topper's Solved these Questions

XII BOARDS
XII BOARDS PREVIOUS YEAR|Exercise SECTION-C|55 Videos
XII BOARDS
XII BOARDS PREVIOUS YEAR|Exercise PHYSICS (Theory) DELHI BOARD -2016 [SET -I][COMPTT.]|12 Videos
XII BOARDS
XII BOARDS PREVIOUS YEAR|Exercise SECTION-A|31 Videos
SAMPLE PAPER 2019
XII BOARDS PREVIOUS YEAR|Exercise SECTION D|6 Videos

Similar Questions

Explore conceptually related problems

What are T.V. signals? Explain their propagation. Find the relation between coverage distance and height of transmitting antenna.

A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

A radiowave that travels in a straight line from the transmitting antenna to the receiving antenna is know as

Height h(400=m) from the ground at place A, from which the readiowaves can be transmitted. There is a receive at station B on earth at a distance d(=125km), which can receive the signal from station A. The radiowaves can reach the station B, either through earth's atmosphere or through satellite. There are four main layers in earth's atmosphere named D,E, F_(1) and F_(2) which play effective role in radio communication. The electron density of these layers is 4xx10^(8), 2xx10^(11),5xx10^(11) and 8xx10^(11)m^(-3) . The radius of the earth is 6.4xx10^(6)m . If the station A sends the T.V. signals, then the maximum area on earth upto which T.V. transmission can be received on earth is (average population density around the tower is 1000 km^(-2) )

If h_(T) and h_(R) are the height of the transmitting and receiving antennas above the earth's surface and R is the radius of earth, then distance between the transmitting and receiving antenna is

At certain distance from a transmitting tower a receiver tower of height 180m is used to receive direct signal. Another tower is installed beyond the first along the same line of sight to receive the signals from the same transmitter. Its height is 21% more than the first receiving tower. Then the separation between the two receiving towers is

A certain distance from a transmitting tower a receiver tower of height 20 m is used to receive direct signal. Another tower is installed beyond the first along the same line of sight to receive the signals from the same transmitter. Its height is 44% more than the first receiving tower. Then the separation between the two receiving towers is

A transmitting antenna of height 25 m is fitted at the top of a tower of height 20m. What is the height of the receiving antenna from ground level if the maximum distance between transmitting antenna and receiving antenna on ground is 56 km. Radius of earth = 6400 km.

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The cordless phone installed in a house uses

XII BOARDS PREVIOUS YEAR-XII BOARDS-SECTION-B

(a) Use Gauss's theorem to find the electric field due to a uniformly...
Text Solution
|
A device 'X' is connected to an ac sourde V = V(0) sin omegat. The var...
Text Solution
|
(a) Draw a labelled diagrame of an ac generator. Obtain the expressio...
Text Solution
|
(a) Define wevefront. Use Huygens 'principle to verify the laws of ref...
Text Solution
|
(a) Draw a ray diagram to show the image formation by a combination o...
Text Solution
|
Two elelctric bulbs P and Q have their resistance in the ratio of 1...
Text Solution
|
A 10 V cell of neglible internal resitsance is connected in parallel...
Text Solution
|
In a potentiometer arrangement for determining the emf of cell, the ...
Text Solution
|
(a) Why are infrared waves often called heat waves? Explain. (b) ...
Text Solution
|
If light of wavelength 412.5 nm is incident on each of the metals give...
Text Solution
|
A carrier wave of peak voltage 15 V is used to transmit a message sign...
Text Solution
|
Two bulbs are reled (P(1),V)" and "(P(2), V). If they are connected (...
Text Solution
|
Calculate the radius of the curvature an equi-concave lens refrective ...
Text Solution
|
An equilateral glass prism has a refrective index 1.6 in air. Calculat...
Text Solution
|
An alpha-"particle" and a proton of the same kinetic energy are in tur...
Text Solution
|
State Both's quantization condition of angular momentum. Calculate the...
Text Solution
|
Calculate the orbital period of the electron in the first excited stat...
Text Solution
|
Why a signal transmitted from a TV tower cannot received beyound a cer...
Text Solution
|
Why is wave theory electromagnetic raiation not able to explain photo ...
Text Solution
|
Plot a graph showing variation of a de Broglie wavelength (lamda) asso...
Text Solution
|